nfs4proc.c 236 KB
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/*
 *  fs/nfs/nfs4proc.c
 *
 *  Client-side procedure declarations for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/string.h>
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#include <linux/ratelimit.h>
#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
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#include <linux/nfs_mount.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/module.h>
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#include <linux/xattr.h>
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#include <linux/utsname.h>
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#include <linux/freezer.h>
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#include "nfs4_fs.h"
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#include "delegation.h"
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#include "internal.h"
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#include "iostat.h"
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#include "callback.h"
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#include "pnfs.h"
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#include "netns.h"
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#include "nfs4idmap.h"
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#include "nfs4session.h"
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#include "fscache.h"
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#include "nfs4trace.h"

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#define NFSDBG_FACILITY		NFSDBG_PROC

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#define NFS4_POLL_RETRY_MIN	(HZ/10)
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#define NFS4_POLL_RETRY_MAX	(15*HZ)

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struct nfs4_opendata;
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static int _nfs4_proc_open(struct nfs4_opendata *data);
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static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
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static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
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static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
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static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
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static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
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static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
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			    struct nfs4_state *state, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);
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#ifdef CONFIG_NFS_V4_1
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static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		struct rpc_cred *);
static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
		struct rpc_cred *);
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#endif
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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
static inline struct nfs4_label *
nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
	struct iattr *sattr, struct nfs4_label *label)
{
	int err;

	if (label == NULL)
		return NULL;

	if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
		return NULL;

	err = security_dentry_init_security(dentry, sattr->ia_mode,
				&dentry->d_name, (void **)&label->label, &label->len);
	if (err == 0)
		return label;

	return NULL;
}
static inline void
nfs4_label_release_security(struct nfs4_label *label)
{
	if (label)
		security_release_secctx(label->label, label->len);
}
static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
{
	if (label)
		return server->attr_bitmask;

	return server->attr_bitmask_nl;
}
#else
static inline struct nfs4_label *
nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
	struct iattr *sattr, struct nfs4_label *l)
{ return NULL; }
static inline void
nfs4_label_release_security(struct nfs4_label *label)
{ return; }
static inline u32 *
nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
{ return server->attr_bitmask; }
#endif

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/* Prevent leaks of NFSv4 errors into userland */
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static int nfs4_map_errors(int err)
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{
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	if (err >= -1000)
		return err;
	switch (err) {
	case -NFS4ERR_RESOURCE:
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	case -NFS4ERR_LAYOUTTRYLATER:
	case -NFS4ERR_RECALLCONFLICT:
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		return -EREMOTEIO;
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	case -NFS4ERR_WRONGSEC:
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	case -NFS4ERR_WRONG_CRED:
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		return -EPERM;
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	case -NFS4ERR_BADOWNER:
	case -NFS4ERR_BADNAME:
		return -EINVAL;
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	case -NFS4ERR_SHARE_DENIED:
		return -EACCES;
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	case -NFS4ERR_MINOR_VERS_MISMATCH:
		return -EPROTONOSUPPORT;
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	case -NFS4ERR_FILE_OPEN:
		return -EBUSY;
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	default:
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		dprintk("%s could not handle NFSv4 error %d\n",
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				__func__, -err);
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		break;
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	}
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	return -EIO;
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}

/*
 * This is our standard bitmap for GETATTR requests.
 */
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const u32 nfs4_fattr_bitmap[3] = {
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	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
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	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
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};

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static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
};

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static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_FILEID,
};

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const u32 nfs4_statfs_bitmap[3] = {
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	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};

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const u32 nfs4_pathconf_bitmap[3] = {
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	FATTR4_WORD0_MAXLINK
	| FATTR4_WORD0_MAXNAME,
	0
};

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const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
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			| FATTR4_WORD0_MAXREAD
			| FATTR4_WORD0_MAXWRITE
			| FATTR4_WORD0_LEASE_TIME,
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			FATTR4_WORD1_TIME_DELTA
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			| FATTR4_WORD1_FS_LAYOUT_TYPES,
			FATTR4_WORD2_LAYOUT_BLKSIZE
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};

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const u32 nfs4_fs_locations_bitmap[3] = {
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	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID
	| FATTR4_WORD0_FS_LOCATIONS,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
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	| FATTR4_WORD1_MOUNTED_ON_FILEID,
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};

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static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
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		struct nfs4_readdir_arg *readdir)
{
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	__be32 *start, *p;
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	if (cookie > 2) {
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		readdir->cookie = cookie;
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		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
		return;
	}

	readdir->cookie = 0;
	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
	if (cookie == 2)
		return;
	
	/*
	 * NFSv4 servers do not return entries for '.' and '..'
	 * Therefore, we fake these entries here.  We let '.'
	 * have cookie 0 and '..' have cookie 1.  Note that
	 * when talking to the server, we always send cookie 0
	 * instead of 1 or 2.
	 */
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	start = p = kmap_atomic(*readdir->pages);
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	if (cookie == 0) {
		*p++ = xdr_one;                                  /* next */
		*p++ = xdr_zero;                   /* cookie, first word */
		*p++ = xdr_one;                   /* cookie, second word */
		*p++ = xdr_one;                             /* entry len */
		memcpy(p, ".\0\0\0", 4);                        /* entry */
		p++;
		*p++ = xdr_one;                         /* bitmap length */
		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
		*p++ = htonl(8);              /* attribute buffer length */
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		p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
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	}
	
	*p++ = xdr_one;                                  /* next */
	*p++ = xdr_zero;                   /* cookie, first word */
	*p++ = xdr_two;                   /* cookie, second word */
	*p++ = xdr_two;                             /* entry len */
	memcpy(p, "..\0\0", 4);                         /* entry */
	p++;
	*p++ = xdr_one;                         /* bitmap length */
	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
	*p++ = htonl(8);              /* attribute buffer length */
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	p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
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	readdir->pgbase = (char *)p - (char *)start;
	readdir->count -= readdir->pgbase;
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	kunmap_atomic(start);
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}

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static long nfs4_update_delay(long *timeout)
{
	long ret;
	if (!timeout)
		return NFS4_POLL_RETRY_MAX;
	if (*timeout <= 0)
		*timeout = NFS4_POLL_RETRY_MIN;
	if (*timeout > NFS4_POLL_RETRY_MAX)
		*timeout = NFS4_POLL_RETRY_MAX;
	ret = *timeout;
	*timeout <<= 1;
	return ret;
}

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static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
	int res = 0;

	might_sleep();

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	freezable_schedule_timeout_killable_unsafe(
		nfs4_update_delay(timeout));
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	if (fatal_signal_pending(current))
		res = -ERESTARTSYS;
	return res;
}

/* This is the error handling routine for processes that are allowed
 * to sleep.
 */
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int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
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{
	struct nfs_client *clp = server->nfs_client;
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	struct nfs4_state *state = exception->state;
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	struct inode *inode = exception->inode;
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	int ret = errorcode;

	exception->retry = 0;
	switch(errorcode) {
		case 0:
			return 0;
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		case -NFS4ERR_OPENMODE:
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		case -NFS4ERR_DELEG_REVOKED:
		case -NFS4ERR_ADMIN_REVOKED:
		case -NFS4ERR_BAD_STATEID:
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			if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
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				nfs4_inode_return_delegation(inode);
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				exception->retry = 1;
				return 0;
			}
			if (state == NULL)
				break;
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			ret = nfs4_schedule_stateid_recovery(server, state);
			if (ret < 0)
				break;
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			goto wait_on_recovery;
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		case -NFS4ERR_EXPIRED:
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			if (state != NULL) {
				ret = nfs4_schedule_stateid_recovery(server, state);
				if (ret < 0)
					break;
			}
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		case -NFS4ERR_STALE_STATEID:
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		case -NFS4ERR_STALE_CLIENTID:
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			nfs4_schedule_lease_recovery(clp);
			goto wait_on_recovery;
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		case -NFS4ERR_MOVED:
			ret = nfs4_schedule_migration_recovery(server);
			if (ret < 0)
				break;
			goto wait_on_recovery;
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		case -NFS4ERR_LEASE_MOVED:
			nfs4_schedule_lease_moved_recovery(clp);
			goto wait_on_recovery;
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#if defined(CONFIG_NFS_V4_1)
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		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
			dprintk("%s ERROR: %d Reset session\n", __func__,
				errorcode);
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			nfs4_schedule_session_recovery(clp->cl_session, errorcode);
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			goto wait_on_recovery;
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#endif /* defined(CONFIG_NFS_V4_1) */
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		case -NFS4ERR_FILE_OPEN:
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			if (exception->timeout > HZ) {
				/* We have retried a decent amount, time to
				 * fail
				 */
				ret = -EBUSY;
				break;
			}
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		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			ret = nfs4_delay(server->client, &exception->timeout);
			if (ret != 0)
				break;
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		case -NFS4ERR_RETRY_UNCACHED_REP:
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		case -NFS4ERR_OLD_STATEID:
			exception->retry = 1;
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			break;
		case -NFS4ERR_BADOWNER:
			/* The following works around a Linux server bug! */
		case -NFS4ERR_BADNAME:
			if (server->caps & NFS_CAP_UIDGID_NOMAP) {
				server->caps &= ~NFS_CAP_UIDGID_NOMAP;
				exception->retry = 1;
				printk(KERN_WARNING "NFS: v4 server %s "
						"does not accept raw "
						"uid/gids. "
						"Reenabling the idmapper.\n",
						server->nfs_client->cl_hostname);
			}
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	}
	/* We failed to handle the error */
	return nfs4_map_errors(ret);
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wait_on_recovery:
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	ret = nfs4_wait_clnt_recover(clp);
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	if (test_bit(NFS_MIG_FAILED, &server->mig_status))
		return -EIO;
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	if (ret == 0)
		exception->retry = 1;
	return ret;
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}

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/*
 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 * or 'false' otherwise.
 */
static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
{
	rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;

	if (flavor == RPC_AUTH_GSS_KRB5I ||
	    flavor == RPC_AUTH_GSS_KRB5P)
		return true;

	return false;
}
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static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
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{
	spin_lock(&clp->cl_lock);
	if (time_before(clp->cl_last_renewal,timestamp))
		clp->cl_last_renewal = timestamp;
	spin_unlock(&clp->cl_lock);
}

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static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
{
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	struct nfs_client *clp = server->nfs_client;

	if (!nfs4_has_session(clp))
		do_renew_lease(clp, timestamp);
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}

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struct nfs4_call_sync_data {
	const struct nfs_server *seq_server;
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
};

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void nfs4_init_sequence(struct nfs4_sequence_args *args,
			struct nfs4_sequence_res *res, int cache_reply)
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{
	args->sa_slot = NULL;
	args->sa_cache_this = cache_reply;
	args->sa_privileged = 0;

	res->sr_slot = NULL;
}

static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
{
	args->sa_privileged = 1;
}

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int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
			 struct nfs4_sequence_args *args,
			 struct nfs4_sequence_res *res,
			 struct rpc_task *task)
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{
	struct nfs4_slot *slot;

	/* slot already allocated? */
	if (res->sr_slot != NULL)
		goto out_start;

	spin_lock(&tbl->slot_tbl_lock);
	if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
		goto out_sleep;

	slot = nfs4_alloc_slot(tbl);
	if (IS_ERR(slot)) {
		if (slot == ERR_PTR(-ENOMEM))
			task->tk_timeout = HZ >> 2;
		goto out_sleep;
	}
	spin_unlock(&tbl->slot_tbl_lock);

	args->sa_slot = slot;
	res->sr_slot = slot;

out_start:
	rpc_call_start(task);
	return 0;

out_sleep:
	if (args->sa_privileged)
		rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
				NULL, RPC_PRIORITY_PRIVILEGED);
	else
		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
	spin_unlock(&tbl->slot_tbl_lock);
	return -EAGAIN;
}
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EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
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static int nfs40_sequence_done(struct rpc_task *task,
			       struct nfs4_sequence_res *res)
{
	struct nfs4_slot *slot = res->sr_slot;
	struct nfs4_slot_table *tbl;

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	if (slot == NULL)
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		goto out;

	tbl = slot->table;
	spin_lock(&tbl->slot_tbl_lock);
	if (!nfs41_wake_and_assign_slot(tbl, slot))
		nfs4_free_slot(tbl, slot);
	spin_unlock(&tbl->slot_tbl_lock);

	res->sr_slot = NULL;
out:
	return 1;
}

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#if defined(CONFIG_NFS_V4_1)

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static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
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{
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	struct nfs4_session *session;
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	struct nfs4_slot_table *tbl;
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	struct nfs4_slot *slot = res->sr_slot;
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	bool send_new_highest_used_slotid = false;
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567
	tbl = slot->table;
568
	session = tbl->session;
569

570
	spin_lock(&tbl->slot_tbl_lock);
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	/* Be nice to the server: try to ensure that the last transmitted
	 * value for highest_user_slotid <= target_highest_slotid
	 */
	if (tbl->highest_used_slotid > tbl->target_highest_slotid)
		send_new_highest_used_slotid = true;

577
	if (nfs41_wake_and_assign_slot(tbl, slot)) {
578 579 580
		send_new_highest_used_slotid = false;
		goto out_unlock;
	}
581
	nfs4_free_slot(tbl, slot);
582 583 584

	if (tbl->highest_used_slotid != NFS4_NO_SLOT)
		send_new_highest_used_slotid = false;
585
out_unlock:
586
	spin_unlock(&tbl->slot_tbl_lock);
587
	res->sr_slot = NULL;
588 589
	if (send_new_highest_used_slotid)
		nfs41_server_notify_highest_slotid_update(session->clp);
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}

592
int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
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{
594
	struct nfs4_session *session;
595
	struct nfs4_slot *slot = res->sr_slot;
596
	struct nfs_client *clp;
597
	bool interrupted = false;
598
	int ret = 1;
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600 601
	if (slot == NULL)
		goto out_noaction;
602 603
	/* don't increment the sequence number if the task wasn't sent */
	if (!RPC_WAS_SENT(task))
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		goto out;

606
	session = slot->table->session;
607

608 609 610 611 612
	if (slot->interrupted) {
		slot->interrupted = 0;
		interrupted = true;
	}

613
	trace_nfs4_sequence_done(session, res);
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	/* Check the SEQUENCE operation status */
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	switch (res->sr_status) {
	case 0:
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		/* Update the slot's sequence and clientid lease timer */
618
		++slot->seq_nr;
619
		clp = session->clp;
620
		do_renew_lease(clp, res->sr_timestamp);
621
		/* Check sequence flags */
622
		nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
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		nfs41_update_target_slotid(slot->table, slot, res);
624
		break;
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	case 1:
		/*
		 * sr_status remains 1 if an RPC level error occurred.
		 * The server may or may not have processed the sequence
		 * operation..
		 * Mark the slot as having hosted an interrupted RPC call.
		 */
		slot->interrupted = 1;
		goto out;
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	case -NFS4ERR_DELAY:
		/* The server detected a resend of the RPC call and
		 * returned NFS4ERR_DELAY as per Section 2.10.6.2
		 * of RFC5661.
		 */
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		dprintk("%s: slot=%u seq=%u: Operation in progress\n",
640
			__func__,
641
			slot->slot_nr,
642
			slot->seq_nr);
643
		goto out_retry;
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	case -NFS4ERR_BADSLOT:
		/*
		 * The slot id we used was probably retired. Try again
		 * using a different slot id.
		 */
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		goto retry_nowait;
	case -NFS4ERR_SEQ_MISORDERED:
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		/*
		 * Was the last operation on this sequence interrupted?
		 * If so, retry after bumping the sequence number.
		 */
		if (interrupted) {
			++slot->seq_nr;
			goto retry_nowait;
		}
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		/*
		 * Could this slot have been previously retired?
		 * If so, then the server may be expecting seq_nr = 1!
		 */
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		if (slot->seq_nr != 1) {
			slot->seq_nr = 1;
			goto retry_nowait;
		}
		break;
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	case -NFS4ERR_SEQ_FALSE_RETRY:
		++slot->seq_nr;
		goto retry_nowait;
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	default:
		/* Just update the slot sequence no. */
673
		++slot->seq_nr;
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	}
out:
	/* The session may be reset by one of the error handlers. */
	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
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	nfs41_sequence_free_slot(res);
679
out_noaction:
680
	return ret;
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retry_nowait:
	if (rpc_restart_call_prepare(task)) {
		task->tk_status = 0;
		ret = 0;
	}
	goto out;
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out_retry:
688
	if (!rpc_restart_call(task))
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		goto out;
	rpc_delay(task, NFS4_POLL_RETRY_MAX);
	return 0;
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}
693
EXPORT_SYMBOL_GPL(nfs41_sequence_done);
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int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
696
{
697
	if (res->sr_slot == NULL)
698
		return 1;
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	if (!res->sr_slot->table->session)
		return nfs40_sequence_done(task, res);
701
	return nfs41_sequence_done(task, res);
702
}
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703
EXPORT_SYMBOL_GPL(nfs4_sequence_done);
704

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int nfs41_setup_sequence(struct nfs4_session *session,
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				struct nfs4_sequence_args *args,
				struct nfs4_sequence_res *res,
				struct rpc_task *task)
{
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	struct nfs4_slot *slot;
	struct nfs4_slot_table *tbl;

	dprintk("--> %s\n", __func__);
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	/* slot already allocated? */
715
	if (res->sr_slot != NULL)
716
		goto out_success;
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	tbl = &session->fc_slot_table;

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	task->tk_timeout = 0;

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	spin_lock(&tbl->slot_tbl_lock);
723
	if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
724
	    !args->sa_privileged) {
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		/* The state manager will wait until the slot table is empty */
		dprintk("%s session is draining\n", __func__);
727
		goto out_sleep;
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	}

730
	slot = nfs4_alloc_slot(tbl);
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	if (IS_ERR(slot)) {
		/* If out of memory, try again in 1/4 second */
		if (slot == ERR_PTR(-ENOMEM))
			task->tk_timeout = HZ >> 2;
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		dprintk("<-- %s: no free slots\n", __func__);
736
		goto out_sleep;
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	}
	spin_unlock(&tbl->slot_tbl_lock);

740
	args->sa_slot = slot;
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742
	dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
743
			slot->slot_nr, slot->seq_nr);
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745
	res->sr_slot = slot;
746
	res->sr_timestamp = jiffies;
747
	res->sr_status_flags = 0;
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	/*
	 * sr_status is only set in decode_sequence, and so will remain
	 * set to 1 if an rpc level failure occurs.
	 */
	res->sr_status = 1;
753
	trace_nfs4_setup_sequence(session, args);
754 755
out_success:
	rpc_call_start(task);
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	return 0;
757
out_sleep:
758 759
	/* Privileged tasks are queued with top priority */
	if (args->sa_privileged)
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		rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
				NULL, RPC_PRIORITY_PRIVILEGED);
	else
		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
764 765
	spin_unlock(&tbl->slot_tbl_lock);
	return -EAGAIN;
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}
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EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
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769 770 771 772
static int nfs4_setup_sequence(const struct nfs_server *server,
			       struct nfs4_sequence_args *args,
			       struct nfs4_sequence_res *res,
			       struct rpc_task *task)
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{
774
	struct nfs4_session *session = nfs4_get_session(server);
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	int ret = 0;

777
	if (!session)
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		return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
					    args, res, task);
780

781
	dprintk("--> %s clp %p session %p sr_slot %u\n",
782
		__func__, session->clp, session, res->sr_slot ?
783
			res->sr_slot->slot_nr : NFS4_NO_SLOT);
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785
	ret = nfs41_setup_sequence(session, args, res, task);
786

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	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
}

static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
{
793
	struct nfs4_call_sync_data *data = calldata;
794
	struct nfs4_session *session = nfs4_get_session(data->seq_server);
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796 797
	dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);

798
	nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
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}

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static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
{
803
	struct nfs4_call_sync_data *data = calldata;
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804

805
	nfs41_sequence_done(task, data->seq_res);
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}

808
static const struct rpc_call_ops nfs41_call_sync_ops = {
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	.rpc_call_prepare = nfs41_call_sync_prepare,
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	.rpc_call_done = nfs41_call_sync_done,
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};

813 814
#else	/* !CONFIG_NFS_V4_1 */

815 816 817 818 819
static int nfs4_setup_sequence(const struct nfs_server *server,
			       struct nfs4_sequence_args *args,
			       struct nfs4_sequence_res *res,
			       struct rpc_task *task)
{
820 821
	return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
				    args, res, task);
822 823
}

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int nfs4_sequence_done(struct rpc_task *task,
		       struct nfs4_sequence_res *res)
826
{
827
	return nfs40_sequence_done(task, res);
828
}
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829
EXPORT_SYMBOL_GPL(nfs4_sequence_done);
830 831

#endif	/* !CONFIG_NFS_V4_1 */
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static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_call_sync_data *data = calldata;
	nfs4_setup_sequence(data->seq_server,
				data->seq_args, data->seq_res, task);
}

static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_call_sync_data *data = calldata;
	nfs4_sequence_done(task, data->seq_res);
}

static const struct rpc_call_ops nfs40_call_sync_ops = {
	.rpc_call_prepare = nfs40_call_sync_prepare,
	.rpc_call_done = nfs40_call_sync_done,
};

851 852
static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
				   struct nfs_server *server,
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				   struct rpc_message *msg,
				   struct nfs4_sequence_args *args,
855
				   struct nfs4_sequence_res *res)
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{
	int ret;
	struct rpc_task *task;
859
	struct nfs_client *clp = server->nfs_client;
860
	struct nfs4_call_sync_data data = {
861
		.seq_server = server,
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		.seq_args = args,
		.seq_res = res,
	};
	struct rpc_task_setup task_setup = {
866
		.rpc_client = clnt,
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		.rpc_message = msg,
868
		.callback_ops = clp->cl_mvops->call_sync_ops,
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		.callback_data = &data
	};

	task = rpc_run_task(&task_setup);
	if (IS_ERR(task))
		ret = PTR_ERR(task);
	else {
		ret = task->tk_status;
		rpc_put_task(task);
	}
	return ret;
}

882 883
int nfs4_call_sync(struct rpc_clnt *clnt,
		   struct nfs_server *server,
884 885 886 887 888
		   struct rpc_message *msg,
		   struct nfs4_sequence_args *args,
		   struct nfs4_sequence_res *res,
		   int cache_reply)
{
889
	nfs4_init_sequence(args, res, cache_reply);
890
	return nfs4_call_sync_sequence(clnt, server, msg, args, res);
891
}
892

893
static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
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894
{
895
	struct nfs_inode *nfsi = NFS_I(dir);
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897
	spin_lock(&dir->i_lock);
898
	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
899
	if (!cinfo->atomic || cinfo->before != dir->i_version)
900
		nfs_force_lookup_revalidate(dir);
901
	dir->i_version = cinfo->after;
902
	nfsi->attr_gencount = nfs_inc_attr_generation_counter();
903
	nfs_fscache_invalidate(dir);
904
	spin_unlock(&dir->i_lock);
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}

907
struct nfs4_opendata {
908
	struct kref kref;
909 910
	struct nfs_openargs o_arg;
	struct nfs_openres o_res;
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	struct nfs_open_confirmargs c_arg;
	struct nfs_open_confirmres c_res;
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	struct nfs4_string owner_name;
	struct nfs4_string group_name;
915
	struct nfs4_label *a_label;
916
	struct nfs_fattr f_attr;
917
	struct nfs4_label *f_label;
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	struct dentry *dir;
919
	struct dentry *dentry;
920
	struct nfs4_state_owner *owner;
921
	struct nfs4_state *state;
922
	struct iattr attrs;
923
	unsigned long timestamp;
924
	unsigned int rpc_done : 1;
925
	unsigned int file_created : 1;
926
	unsigned int is_recover : 1;
927 928
	int rpc_status;
	int cancelled;
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};

931 932 933 934 935 936 937 938 939 940 941 942
static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
		int err, struct nfs4_exception *exception)
{
	if (err != -EINVAL)
		return false;
	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
		return false;
	server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
	exception->retry = 1;
	return true;
}

943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
static u32
nfs4_map_atomic_open_share(struct nfs_server *server,
		fmode_t fmode, int openflags)
{
	u32 res = 0;

	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
	case FMODE_READ:
		res = NFS4_SHARE_ACCESS_READ;
		break;
	case FMODE_WRITE:
		res = NFS4_SHARE_ACCESS_WRITE;
		break;
	case FMODE_READ|FMODE_WRITE:
		res = NFS4_SHARE_ACCESS_BOTH;
	}
	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
		goto out;
	/* Want no delegation if we're using O_DIRECT */
	if (openflags & O_DIRECT)
		res |= NFS4_SHARE_WANT_NO_DELEG;
out:
	return res;
}

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static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server *server,
		enum open_claim_type4 claim)
{
	if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
		return claim;
	switch (claim) {
	default:
		return claim;
	case NFS4_OPEN_CLAIM_FH:
		return NFS4_OPEN_CLAIM_NULL;
	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
		return NFS4_OPEN_CLAIM_DELEGATE_CUR;
	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
		return NFS4_OPEN_CLAIM_DELEGATE_PREV;
	}
}
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static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
	p->o_res.f_attr = &p->f_attr;
989
	p->o_res.f_label = p->f_label;
990 991
	p->o_res.seqid = p->o_arg.seqid;
	p->c_res.seqid = p->c_arg.seqid;
992
	p->o_res.server = p->o_arg.server;
993
	p->o_res.access_request = p->o_arg.access;
994
	nfs_fattr_init(&p->f_attr);
995
	nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
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}

998
static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
999
		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1000
		const struct iattr *attrs,
1001
		struct nfs4_label *label,
1002
		enum open_claim_type4 claim,
1003
		gfp_t gfp_mask)
1004
{
1005
	struct dentry *parent = dget_parent(dentry);
1006
	struct inode *dir = d_inode(parent);
1007
	struct nfs_server *server = NFS_SERVER(dir);
1008
	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1009 1010
	struct nfs4_opendata *p;

1011
	p = kzalloc(sizeof(*p), gfp_mask);
1012 1013
	if (p == NULL)
		goto err;
1014 1015 1016 1017 1018

	p->f_label = nfs4_label_alloc(server, gfp_mask);
	if (IS_ERR(p->f_label))
		goto err_free_p;

1019 1020 1021 1022
	p->a_label = nfs4_label_alloc(server, gfp_mask);
	if (IS_ERR(p->a_label))
		goto err_free_f;

1023 1024
	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
	p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1025
	if (IS_ERR(p->o_arg.seqid))
1026
		goto err_free_label;
1027 1028
	nfs_sb_active(dentry->d_sb);
	p->dentry = dget(dentry);
1029 1030 1031
	p->dir = parent;
	p->owner = sp;
	atomic_inc(&sp->so_count);
1032 1033
	p->o_arg.open_flags = flags;
	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1034 1035
	p->o_arg.share_access = nfs4_map_atomic_open_share(server,
			fmode, flags);
1036 1037 1038 1039 1040 1041 1042 1043
	/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
	 * will return permission denied for all bits until close */
	if (!(flags & O_EXCL)) {
		/* ask server to check for all possible rights as results
		 * are cached */
		p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
				  NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
	}
1044
	p->o_arg.clientid = server->nfs_client->cl_clientid;
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	p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
	p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1047
	p->o_arg.name = &dentry->d_name;
1048
	p->o_arg.server = server;
1049
	p->o_arg.bitmask = nfs4_bitmask(server, label);
1050
	p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1051
	p->o_arg.label = nfs4_label_copy(p->a_label, label);
1052 1053
	p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
	switch (p->o_arg.claim) {
1054 1055 1056 1057 1058 1059 1060 1061 1062
	case NFS4_OPEN_CLAIM_NULL:
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
		p->o_arg.fh = NFS_FH(dir);
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
	case NFS4_OPEN_CLAIM_FH:
	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1063
		p->o_arg.fh = NFS_FH(d_inode(dentry));
1064
	}
1065
	if (attrs != NULL && attrs->ia_valid != 0) {
1066
		__u32 verf[2];
1067

1068 1069
		p->o_arg.u.attrs = &p->attrs;
		memcpy(&p->attrs, attrs, sizeof(p->attrs));
1070 1071 1072 1073 1074

		verf[0] = jiffies;
		verf[1] = current->pid;
		memcpy(p->o_arg.u.verifier.data, verf,
				sizeof(p->o_arg.u.verifier.data));
1075
	}
1076 1077 1078
	p->c_arg.fh = &p->o_res.fh;
	p->c_arg.stateid = &p->o_res.stateid;
	p->c_arg.seqid = p->o_arg.seqid;
1079
	nfs4_init_opendata_res(p);
1080
	kref_init(&p->kref);
1081
	return p;
1082 1083

err_free_label:
1084 1085
	nfs4_label_free(p->a_label);
err_free_f:
1086 1087
	nfs4_label_free(p->f_label);
err_free_p:
1088 1089 1090 1091 1092 1093
	kfree(p);
err:
	dput(parent);
	return NULL;
}

1094
static void nfs4_opendata_free(struct kref *kref)
1095
{
1096 1097
	struct nfs4_opendata *p = container_of(kref,
			struct nfs4_opendata, kref);
1098
	struct super_block *sb = p->dentry->d_sb;
1099 1100

	nfs_free_seqid(p->o_arg.seqid);
1101 1102
	if (p->state != NULL)
		nfs4_put_open_state(p->state);
1103
	nfs4_put_state_owner(p->owner);
1104

1105
	nfs4_label_free(p->a_label);
1106 1107
	nfs4_label_free(p->f_label);

1108
	dput(p->dir);
1109 1110
	dput(p->dentry);
	nfs_sb_deactive(sb);
1111
	nfs_fattr_free_names(&p->f_attr);
1112
	kfree(p->f_attr.mdsthreshold);
1113 1114 1115 1116 1117 1118 1119
	kfree(p);
}

static void nfs4_opendata_put(struct nfs4_opendata *p)
{
	if (p != NULL)
		kref_put(&p->kref, nfs4_opendata_free);
1120 1121
}

1122 1123 1124 1125 1126 1127 1128 1129
static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
{
	int ret;

	ret = rpc_wait_for_completion_task(task);
	return ret;
}

1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
		fmode_t fmode)
{
	switch(fmode & (FMODE_READ|FMODE_WRITE)) {
	case FMODE_READ|FMODE_WRITE:
		return state->n_rdwr != 0;
	case FMODE_WRITE:
		return state->n_wronly != 0;
	case FMODE_READ:
		return state->n_rdonly != 0;
	}
	WARN_ON_ONCE(1);
	return false;
}

1145
static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1146 1147
{
	int ret = 0;
1148

1149
	if (open_mode & (O_EXCL|O_TRUNC))
1150 1151
		goto out;
	switch (mode & (FMODE_READ|FMODE_WRITE)) {
1152
		case FMODE_READ:
1153 1154
			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
				&& state->n_rdonly != 0;
1155 1156
			break;
		case FMODE_WRITE:
1157 1158
			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
				&& state->n_wronly != 0;
1159 1160
			break;
		case FMODE_READ|FMODE_WRITE:
1161 1162
			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
				&& state->n_rdwr != 0;
1163
	}
1164
out:
1165 1166 1167
	return ret;
}

1168
static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1169
{
1170 1171
	if (delegation == NULL)
		return 0;
1172
	if ((delegation->type & fmode) != fmode)
1173
		return 0;
1174 1175
	if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
		return 0;
1176 1177
	if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
		return 0;
1178
	nfs_mark_delegation_referenced(delegation);
1179 1180 1181
	return 1;
}

1182
static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1183
{
1184
	switch (fmode) {
1185 1186 1187 1188 1189 1190 1191 1192 1193
		case FMODE_WRITE:
			state->n_wronly++;
			break;
		case FMODE_READ:
			state->n_rdonly++;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr++;
	}
1194
	nfs4_state_set_mode_locked(state, state->state | fmode);
1195 1196
}

1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
{
	struct nfs_client *clp = state->owner->so_server->nfs_client;
	bool need_recover = false;

	if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
		need_recover = true;
	if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
		need_recover = true;
	if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
		need_recover = true;
	if (need_recover)
		nfs4_state_mark_reclaim_nograce(clp, state);
}

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static bool nfs_need_update_open_stateid(struct nfs4_state *state,
		nfs4_stateid *stateid)
{
	if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
		return true;
1217 1218
	if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
		nfs_test_and_clear_all_open_stateid(state);
1219
		return true;
1220
	}
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	if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
		return true;
	return false;
}

1226 1227
static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
{
1228 1229
	if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
		return;
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	if (state->n_wronly)
		set_bit(NFS_O_WRONLY_STATE, &state->flags);
	if (state->n_rdonly)
		set_bit(NFS_O_RDONLY_STATE, &state->flags);
	if (state->n_rdwr)
		set_bit(NFS_O_RDWR_STATE, &state->flags);
1236
	set_bit(NFS_OPEN_STATE, &state->flags);
1237 1238
}

1239
static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1240
		nfs4_stateid *arg_stateid,
1241
		nfs4_stateid *stateid, fmode_t fmode)
1242
{
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
	clear_bit(NFS_O_RDWR_STATE, &state->flags);
	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
	case FMODE_WRITE:
		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
		break;
	case FMODE_READ:
		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
		break;
	case 0:
		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
		clear_bit(NFS_OPEN_STATE, &state->flags);
	}
	if (stateid == NULL)
		return;
1258
	/* Handle races with OPEN */
1259 1260 1261
	if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
	    (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
	    !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1262
		nfs_resync_open_stateid_locked(state);
1263
		return;
1264
	}
1265
	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1266 1267
		nfs4_stateid_copy(&state->stateid, stateid);
	nfs4_stateid_copy(&state->open_stateid, stateid);
1268 1269
}

1270 1271 1272
static void nfs_clear_open_stateid(struct nfs4_state *state,
	nfs4_stateid *arg_stateid,
	nfs4_stateid *stateid, fmode_t fmode)
1273 1274
{
	write_seqlock(&state->seqlock);
1275
	nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1276
	write_sequnlock(&state->seqlock);
1277 1278
	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
		nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1279 1280
}

1281
static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1282
{
1283
	switch (fmode) {
1284 1285 1286 1287 1288 1289 1290 1291 1292
		case FMODE_READ:
			set_bit(NFS_O_RDONLY_STATE, &state->flags);
			break;
		case FMODE_WRITE:
			set_bit(NFS_O_WRONLY_STATE, &state->flags);
			break;
		case FMODE_READ|FMODE_WRITE:
			set_bit(NFS_O_RDWR_STATE, &state->flags);
	}
1293 1294 1295 1296 1297
	if (!nfs_need_update_open_stateid(state, stateid))
		return;
	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
		nfs4_stateid_copy(&state->stateid, stateid);
	nfs4_stateid_copy(&state->open_stateid, stateid);
1298 1299
}

1300
static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
Linus Torvalds's avatar
Linus Torvalds committed
1301
{
1302 1303 1304 1305
	/*
	 * Protect the call to nfs4_state_set_mode_locked and
	 * serialise the stateid update
	 */
1306
	spin_lock(&state->owner->so_lock);
1307
	write_seqlock(&state->seqlock);
1308
	if (deleg_stateid != NULL) {
1309
		nfs4_stateid_copy(&state->stateid, deleg_stateid);
1310 1311 1312
		set_bit(NFS_DELEGATED_STATE, &state->flags);
	}
	if (open_stateid != NULL)
1313
		nfs_set_open_stateid_locked(state, open_stateid, fmode);
1314
	write_sequnlock(&state->seqlock);
1315
	update_open_stateflags(state, fmode);
1316
	spin_unlock(&state->owner->so_lock);
Linus Torvalds's avatar
Linus Torvalds committed
1317 1318
}

1319
static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1320 1321 1322 1323 1324
{
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_delegation *deleg_cur;
	int ret = 0;

1325
	fmode &= (FMODE_READ|FMODE_WRITE);
1326 1327 1328 1329 1330 1331 1332

	rcu_read_lock();
	deleg_cur = rcu_dereference(nfsi->delegation);
	if (deleg_cur == NULL)
		goto no_delegation;

	spin_lock(&deleg_cur->lock);
1333
	if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1334
	   test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1335
	    (deleg_cur->type & fmode) != fmode)
1336 1337 1338 1339
		goto no_delegation_unlock;

	if (delegation == NULL)
		delegation = &deleg_cur->stateid;
1340
	else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1341 1342
		goto no_delegation_unlock;

1343
	nfs_mark_delegation_referenced(deleg_cur);
1344
	__update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1345 1346 1347 1348 1349 1350 1351
	ret = 1;
no_delegation_unlock:
	spin_unlock(&deleg_cur->lock);
no_delegation:
	rcu_read_unlock();

	if (!ret && open_stateid != NULL) {
1352
		__update_open_stateid(state, open_stateid, NULL, fmode);
1353 1354
		ret = 1;
	}
1355 1356
	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
		nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1357 1358 1359 1360

	return ret;
}

1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
		const nfs4_stateid *stateid)
{
	struct nfs4_state *state = lsp->ls_state;
	bool ret = false;

	spin_lock(&state->state_lock);
	if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
		goto out_noupdate;
	if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
		goto out_noupdate;
	nfs4_stateid_copy(&lsp->ls_stateid, stateid);
	ret = true;
out_noupdate:
	spin_unlock(&state->state_lock);
	return ret;
}
1378

1379
static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1380 1381 1382 1383 1384
{
	struct nfs_delegation *delegation;

	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(inode)->delegation);
1385
	if (delegation == NULL || (delegation->type & fmode) == fmode) {
1386 1387 1388 1389
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();
1390
	nfs4_inode_return_delegation(inode);
1391 1392
}

1393
static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1394 1395 1396 1397
{
	struct nfs4_state *state = opendata->state;
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_delegation *delegation;
1398
	int open_mode = opendata->o_arg.open_flags;
1399
	fmode_t fmode = opendata->o_arg.fmode;
1400 1401 1402 1403
	nfs4_stateid stateid;
	int ret = -EAGAIN;

	for (;;) {
1404
		spin_lock(&state->owner->so_lock);
1405
		if (can_open_cached(state, fmode, open_mode)) {
1406
			update_open_stateflags(state, fmode);
1407
			spin_unlock(&state->owner->so_lock);
1408
			goto out_return_state;
1409
		}
1410
		spin_unlock(&state->owner->so_lock);
1411 1412
		rcu_read_lock();
		delegation = rcu_dereference(nfsi->delegation);
1413
		if (!can_open_delegated(delegation, fmode)) {
1414
			rcu_read_unlock();
1415
			break;
1416
		}
1417
		/* Save the delegation */
1418
		nfs4_stateid_copy(&stateid, &delegation->stateid);
1419
		rcu_read_unlock();
1420
		nfs_release_seqid(opendata->o_arg.seqid);
1421 1422 1423 1424 1425
		if (!opendata->is_recover) {
			ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
			if (ret != 0)
				goto out;
		}
1426
		ret = -EAGAIN;
1427 1428

		/* Try to update the stateid using the delegation */
1429
		if (update_open_stateid(state, NULL, &stateid, fmode))
1430
			goto out_return_state;
1431 1432 1433 1434 1435 1436 1437 1438
	}
out:
	return ERR_PTR(ret);
out_return_state:
	atomic_inc(&state->count);
	return state;
}

1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
static void
nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
{
	struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
	struct nfs_delegation *delegation;
	int delegation_flags = 0;

	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
	if (delegation)
		delegation_flags = delegation->flags;
	rcu_read_unlock();
	if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
		pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
				   "returning a delegation for "
				   "OPEN(CLAIM_DELEGATE_CUR)\n",
				   clp->cl_hostname);
	} else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
		nfs_inode_set_delegation(state->inode,
					 data->owner->so_cred,
					 &data->o_res);
	else
		nfs_inode_reclaim_delegation(state->inode,
					     data->owner->so_cred,
					     &data->o_res);
}

/*
 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
 * and update the nfs4_state.
 */
static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
{
	struct inode *inode = data->state->inode;
	struct nfs4_state *state = data->state;
	int ret;

1477 1478 1479 1480 1481 1482 1483
	if (!data->rpc_done) {
		if (data->rpc_status) {
			ret = data->rpc_status;
			goto err;
		}
		/* cached opens have already been processed */
		goto update;
1484 1485 1486 1487 1488 1489 1490 1491
	}

	ret = nfs_refresh_inode(inode, &data->f_attr);
	if (ret)
		goto err;

	if (data->o_res.delegation_type != 0)
		nfs4_opendata_check_deleg(data, state);
1492
update:
1493 1494
	update_open_stateid(state, &data->o_res.stateid, NULL,
			    data->o_arg.fmode);
1495
	atomic_inc(&state->count);
1496 1497 1498 1499 1500 1501 1502 1503 1504

	return state;
err:
	return ERR_PTR(ret);

}

static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1505 1506 1507
{
	struct inode *inode;
	struct nfs4_state *state = NULL;
1508
	int ret;
1509

1510
	if (!data->rpc_done) {
1511
		state = nfs4_try_open_cached(data);
1512 1513 1514
		goto out;
	}

1515
	ret = -EAGAIN;
1516
	if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1517
		goto err;
1518
	inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1519
	ret = PTR_ERR(inode);
1520
	if (IS_ERR(inode))
1521 1522
		goto err;
	ret = -ENOMEM;
1523 1524
	state = nfs4_get_open_state(inode, data->owner);
	if (state == NULL)
1525
		goto err_put_inode;
1526 1527
	if (data->o_res.delegation_type != 0)
		nfs4_opendata_check_deleg(data, state);
1528
	update_open_stateid(state, &data->o_res.stateid, NULL,
1529
			data->o_arg.fmode);
1530
	iput(inode);
1531
out:
1532
	nfs_release_seqid(data->o_arg.seqid);
1533
	return state;
1534 1535 1536 1537
err_put_inode:
	iput(inode);
err:
	return ERR_PTR(ret);
1538 1539
}

1540 1541 1542 1543 1544 1545 1546 1547
static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
		return _nfs4_opendata_reclaim_to_nfs4_state(data);
	return _nfs4_opendata_to_nfs4_state(data);
}

1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
{
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_open_context *ctx;

	spin_lock(&state->inode->i_lock);
	list_for_each_entry(ctx, &nfsi->open_files, list) {
		if (ctx->state != state)
			continue;
		get_nfs_open_context(ctx);
		spin_unlock(&state->inode->i_lock);
		return ctx;
	}
	spin_unlock(&state->inode->i_lock);
	return ERR_PTR(-ENOENT);
}

1565 1566
static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
		struct nfs4_state *state, enum open_claim_type4 claim)
1567 1568 1569
{
	struct nfs4_opendata *opendata;

1570
	opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1571
			NULL, NULL, claim, GFP_NOFS);
1572 1573 1574 1575 1576 1577 1578
	if (opendata == NULL)
		return ERR_PTR(-ENOMEM);
	opendata->state = state;
	atomic_inc(&state->count);
	return opendata;
}

1579 1580
static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
		fmode_t fmode)
1581
{
1582
	struct nfs4_state *newstate;
1583 1584
	int ret;

1585
	if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1586
		return 0;
1587 1588
	opendata->o_arg.open_flags = 0;
	opendata->o_arg.fmode = fmode;
1589 1590 1591
	opendata->o_arg.share_access = nfs4_map_atomic_open_share(
			NFS_SB(opendata->dentry->d_sb),
			fmode, 0);
1592 1593 1594
	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
	nfs4_init_opendata_res(opendata);
1595
	ret = _nfs4_recover_proc_open(opendata);
1596 1597
	if (ret != 0)
		return ret; 
1598
	newstate = nfs4_opendata_to_nfs4_state(opendata);
1599 1600
	if (IS_ERR(newstate))
		return PTR_ERR(newstate);
1601 1602
	if (newstate != opendata->state)
		ret = -ESTALE;
1603
	nfs4_close_state(newstate, fmode);
1604
	return ret;
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}

static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
{
	int ret;

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	/* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
	clear_bit(NFS_O_RDWR_STATE, &state->flags);
	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1615
	/* memory barrier prior to reading state->n_* */
1616
	clear_bit(NFS_DELEGATED_STATE, &state->flags);
1617
	clear_bit(NFS_OPEN_STATE, &state->flags);
1618
	smp_rmb();
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	ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
	if (ret != 0)
		return ret;
	ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
	if (ret != 0)
		return ret;
	ret = nfs4_open_recover_helper(opendata, FMODE_READ);
	if (ret != 0)
		return ret;
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	/*
	 * We may have performed cached opens for all three recoveries.
	 * Check if we need to update the current stateid.
	 */
	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1633
	    !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1634
		write_seqlock(&state->seqlock);
1635
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1636
			nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1637
		write_sequnlock(&state->seqlock);
1638
	}
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	return 0;
}

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/*
 * OPEN_RECLAIM:
 * 	reclaim state on the server after a reboot.
 */
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static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
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{
1648
	struct nfs_delegation *delegation;
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	struct nfs4_opendata *opendata;
1650
	fmode_t delegation_type = 0;
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	int status;

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	opendata = nfs4_open_recoverdata_alloc(ctx, state,
			NFS4_OPEN_CLAIM_PREVIOUS);
1655 1656
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
1657 1658
	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1659
	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1660
		delegation_type = delegation->type;
1661
	rcu_read_unlock();
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	opendata->o_arg.u.delegation_type = delegation_type;
	status = nfs4_open_recover(opendata, state);
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	nfs4_opendata_put(opendata);
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	return status;
}

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static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
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{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;
	do {
1674
		err = _nfs4_do_open_reclaim(ctx, state);
1675
		trace_nfs4_open_reclaim(ctx, 0, err);
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		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
			continue;
1678
		if (err != -NFS4ERR_DELAY)
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			break;
		nfs4_handle_exception(server, err, &exception);
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	} while (exception.retry);
	return err;
}

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static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
	struct nfs_open_context *ctx;
	int ret;

	ctx = nfs4_state_find_open_context(state);
	if (IS_ERR(ctx))
1692
		return -EAGAIN;
1693
	ret = nfs4_do_open_reclaim(ctx, state);
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	put_nfs_open_context(ctx);
	return ret;
}

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static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
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{
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	switch (err) {
		default:
			printk(KERN_ERR "NFS: %s: unhandled error "
					"%d.\n", __func__, err);
		case 0:
		case -ENOENT:
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		case -EAGAIN:
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		case -ESTALE:
			break;
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_DEADSESSION:
			set_bit(NFS_DELEGATED_STATE, &state->flags);
			nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
			return -EAGAIN;
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_STALE_STATEID:
			set_bit(NFS_DELEGATED_STATE, &state->flags);
		case -NFS4ERR_EXPIRED:
			/* Don't recall a delegation if it was lost */
			nfs4_schedule_lease_recovery(server->nfs_client);
			return -EAGAIN;
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		case -NFS4ERR_MOVED:
			nfs4_schedule_migration_recovery(server);
			return -EAGAIN;
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		case -NFS4ERR_LEASE_MOVED:
			nfs4_schedule_lease_moved_recovery(server->nfs_client);
			return -EAGAIN;
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		case -NFS4ERR_DELEG_REVOKED:
		case -NFS4ERR_ADMIN_REVOKED:
		case -NFS4ERR_BAD_STATEID:
1733
		case -NFS4ERR_OPENMODE:
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			nfs_inode_find_state_and_recover(state->inode,
					stateid);
			nfs4_schedule_stateid_recovery(server, state);
1737
			return -EAGAIN;
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		case -NFS4ERR_DELAY:
		case -NFS4ERR_GRACE:
			set_bit(NFS_DELEGATED_STATE, &state->flags);
			ssleep(1);
			return -EAGAIN;
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		case -ENOMEM:
		case -NFS4ERR_DENIED:
			/* kill_proc(fl->fl_pid, SIGLOST, 1); */
			return 0;
1747
	}
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	return err;
}

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int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
		struct nfs4_state *state, const nfs4_stateid *stateid,
		fmode_t type)
1754 1755 1756
{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_opendata *opendata;
1757
	int err = 0;
1758 1759 1760 1761 1762 1763

	opendata = nfs4_open_recoverdata_alloc(ctx, state,
			NFS4_OPEN_CLAIM_DELEG_CUR_FH);
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
	nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
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	clear_bit(NFS_DELEGATED_STATE, &state->flags);
	switch (type & (FMODE_READ|FMODE_WRITE)) {
	case FMODE_READ|FMODE_WRITE:
	case FMODE_WRITE:
		err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
		if (err)
			break;
		err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
		if (err)
			break;
	case FMODE_READ:
		err = nfs4_open_recover_helper(opendata, FMODE_READ);
	}
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	nfs4_opendata_put(opendata);
	return nfs4_handle_delegation_recall_error(server, state, stateid, err);
}

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static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;

1785 1786
	nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
			     &data->c_arg.seq_args, &data->c_res.seq_res, task);
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}

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static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;

1793
	nfs40_sequence_done(task, &data->c_res.seq_res);
1794

1795
	data->rpc_status = task->tk_status;
1796
	if (data->rpc_status == 0) {
1797
		nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1798
		nfs_confirm_seqid(&data->owner->so_seqid, 0);
1799
		renew_lease(data->o_res.server, data->timestamp);
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		data->rpc_done = 1;
1801
	}
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}

static void nfs4_open_confirm_release(void *calldata)
{
	struct nfs4_opendata *data = calldata;
	struct nfs4_state *state = NULL;

	/* If this request hasn't been cancelled, do nothing */
	if (data->cancelled == 0)
		goto out_free;
	/* In case of error, no cleanup! */
1813
	if (!data->rpc_done)
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		goto out_free;
	state = nfs4_opendata_to_nfs4_state(data);
1816
	if (!IS_ERR(state))
1817
		nfs4_close_state(state, data->o_arg.fmode);
1818
out_free:
1819
	nfs4_opendata_put(data);
1820 1821 1822
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
1823
	.rpc_call_prepare = nfs4_open_confirm_prepare,
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	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

/*
 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 */
static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
{
1833
	struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1834
	struct rpc_task *task;
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	struct  rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
		.rpc_argp = &data->c_arg,
		.rpc_resp = &data->c_res,
		.rpc_cred = data->owner->so_cred,
	};
1841 1842
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
1843
		.rpc_message = &msg,
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		.callback_ops = &nfs4_open_confirm_ops,
		.callback_data = data,
1846
		.workqueue = nfsiod_workqueue,
1847 1848
		.flags = RPC_TASK_ASYNC,
	};
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	int status;

1851
	nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
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	kref_get(&data->kref);
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	data->rpc_done = 0;
	data->rpc_status = 0;
1855
	data->timestamp = jiffies;
1856
	task = rpc_run_task(&task_setup_data);
1857
	if (IS_ERR(task))
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		return PTR_ERR(task);
	status = nfs4_wait_for_completion_rpc_task(task);
	if (status != 0) {
		data->cancelled = 1;
		smp_wmb();
	} else
		status = data->rpc_status;
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	rpc_put_task(task);
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	return status;
}

1869
static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
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{
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	struct nfs4_opendata *data = calldata;
	struct nfs4_state_owner *sp = data->owner;
1873
	struct nfs_client *clp = sp->so_server->nfs_client;
1874

1875
	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1876
		goto out_wait;
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	/*
	 * Check if we still need to send an OPEN call, or if we can use
	 * a delegation instead.
	 */
	if (data->state != NULL) {
		struct nfs_delegation *delegation;

1884
		if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1885
			goto out_no_action;
1886 1887
		rcu_read_lock();
		delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1888
		if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
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		    data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1890 1891
		    can_open_delegated(delegation, data->o_arg.fmode))
			goto unlock_no_action;
1892 1893
		rcu_read_unlock();
	}
1894
	/* Update client id. */
1895
	data->o_arg.clientid = clp->cl_clientid;
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	switch (data->o_arg.claim) {
	case NFS4_OPEN_CLAIM_PREVIOUS:
	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1900
		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1901 1902
	case NFS4_OPEN_CLAIM_FH:
		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1903 1904
		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
	}
1905
	data->timestamp = jiffies;
1906
	if (nfs4_setup_sequence(data->o_arg.server,
1907
				&data->o_arg.seq_args,
1908 1909 1910
				&data->o_res.seq_res,
				task) != 0)
		nfs_release_seqid(data->o_arg.seqid);
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	/* Set the create mode (note dependency on the session type) */
	data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
	if (data->o_arg.open_flags & O_EXCL) {
		data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
		if (nfs4_has_persistent_session(clp))
			data->o_arg.createmode = NFS4_CREATE_GUARDED;
		else if (clp->cl_mvops->minor_version > 0)
			data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
	}
1921
	return;
1922 1923
unlock_no_action:
	rcu_read_unlock();
1924 1925
out_no_action:
	task->tk_action = NULL;
1926
out_wait:
1927
	nfs4_sequence_done(task, &data->o_res.seq_res);
1928 1929
}

1930 1931 1932
static void nfs4_open_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;
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1934
	data->rpc_status = task->tk_status;
1935

1936 1937
	if (!nfs4_sequence_done(task, &data->o_res.seq_res))
		return;
1938

1939
	if (task->tk_status == 0) {
1940 1941
		if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
			switch (data->o_res.f_attr->mode & S_IFMT) {
1942 1943 1944
			case S_IFREG:
				break;
			case S_IFLNK:
1945
				data->rpc_status = -ELOOP;
1946 1947
				break;
			case S_IFDIR:
1948
				data->rpc_status = -EISDIR;
1949 1950
				break;
			default:
1951
				data->rpc_status = -ENOTDIR;
1952
			}
1953
		}
1954
		renew_lease(data->o_res.server, data->timestamp);
1955 1956
		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
			nfs_confirm_seqid(&data->owner->so_seqid, 0);
1957
	}
1958
	data->rpc_done = 1;
1959
}
1960

1961 1962 1963 1964 1965 1966 1967 1968 1969
static void nfs4_open_release(void *calldata)
{
	struct nfs4_opendata *data = calldata;
	struct nfs4_state *state = NULL;

	/* If this request hasn't been cancelled, do nothing */
	if (data->cancelled == 0)
		goto out_free;
	/* In case of error, no cleanup! */
1970
	if (data->rpc_status != 0 || !data->rpc_done)
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		goto out_free;
	/* In case we need an open_confirm, no cleanup! */
	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
		goto out_free;
	state = nfs4_opendata_to_nfs4_state(data);
1976
	if (!IS_ERR(state))
1977
		nfs4_close_state(state, data->o_arg.fmode);
1978
out_free:
1979
	nfs4_opendata_put(data);
1980 1981 1982 1983 1984 1985 1986 1987
}

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

1988
static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1989
{
1990
	struct inode *dir = d_inode(data->dir);
1991 1992 1993 1994
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_openargs *o_arg = &data->o_arg;
	struct nfs_openres *o_res = &data->o_res;
	struct rpc_task *task;
1995 1996 1997 1998 1999 2000
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
		.rpc_argp = o_arg,
		.rpc_resp = o_res,
		.rpc_cred = data->owner->so_cred,
	};
2001 2002
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
2003
		.rpc_message = &msg,
2004 2005
		.callback_ops = &nfs4_open_ops,
		.callback_data = data,
2006
		.workqueue = nfsiod_workqueue,
2007 2008
		.flags = RPC_TASK_ASYNC,
	};
2009 2010
	int status;

2011
	nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2012
	kref_get(&data->kref);
2013 2014
	data->rpc_done = 0;
	data->rpc_status = 0;
2015
	data->cancelled = 0;
2016 2017
	data->is_recover = 0;
	if (isrecover) {
2018
		nfs4_set_sequence_privileged(&o_arg->seq_args);
2019 2020
		data->is_recover = 1;
	}
2021
	task = rpc_run_task(&task_setup_data);
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
        if (IS_ERR(task))
                return PTR_ERR(task);
        status = nfs4_wait_for_completion_rpc_task(task);
        if (status != 0) {
                data->cancelled = 1;
                smp_wmb();
        } else
                status = data->rpc_status;
        rpc_put_task(task);

	return status;
}

static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
{
2037
	struct inode *dir = d_inode(data->dir);
2038 2039 2040 2041 2042 2043 2044
	struct nfs_openres *o_res = &data->o_res;
        int status;

	status = nfs4_run_open_task(data, 1);
	if (status != 0 || !data->rpc_done)
		return status;

2045 2046
	nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);

2047 2048 2049 2050 2051 2052 2053 2054 2055
	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
		status = _nfs4_proc_open_confirm(data);
		if (status != 0)
			return status;
	}

	return status;
}

2056 2057 2058 2059 2060 2061 2062 2063
/*
 * Additional permission checks in order to distinguish between an
 * open for read, and an open for execute. This works around the
 * fact that NFSv4 OPEN treats read and execute permissions as being
 * the same.
 * Note that in the non-execute case, we want to turn off permission
 * checking if we just created a new file (POSIX open() semantics).
 */
2064 2065
static int nfs4_opendata_access(struct rpc_cred *cred,
				struct nfs4_opendata *opendata,
2066 2067
				struct nfs4_state *state, fmode_t fmode,
				int openflags)
2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
{
	struct nfs_access_entry cache;
	u32 mask;

	/* access call failed or for some reason the server doesn't
	 * support any access modes -- defer access call until later */
	if (opendata->o_res.access_supported == 0)
		return 0;

	mask = 0;
2078 2079 2080 2081
	/*
	 * Use openflags to check for exec, because fmode won't
	 * always have FMODE_EXEC set when file open for exec.
	 */
2082 2083 2084
	if (openflags & __FMODE_EXEC) {
		/* ONLY check for exec rights */
		mask = MAY_EXEC;
2085
	} else if ((fmode & FMODE_READ) && !opendata->file_created)
2086
		mask = MAY_READ;
2087 2088 2089 2090 2091 2092

	cache.cred = cred;
	cache.jiffies = jiffies;
	nfs_access_set_mask(&cache, opendata->o_res.access_result);
	nfs_access_add_cache(state->inode, &cache);

2093
	if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2094 2095 2096 2097
		return 0;

	/* even though OPEN succeeded, access is denied. Close the file */
	nfs4_close_state(state, fmode);
2098
	return -EACCES;
2099 2100
}

2101 2102 2103 2104 2105
/*
 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 */
static int _nfs4_proc_open(struct nfs4_opendata *data)
{
2106
	struct inode *dir = d_inode(data->dir);
2107 2108 2109 2110 2111 2112
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_openargs *o_arg = &data->o_arg;
	struct nfs_openres *o_res = &data->o_res;
	int status;

	status = nfs4_run_open_task(data, 0);
2113 2114 2115 2116 2117 2118
	if (!data->rpc_done)
		return status;
	if (status != 0) {
		if (status == -NFS4ERR_BADNAME &&
				!(o_arg->open_flags & O_CREAT))
			return -ENOENT;
2119
		return status;
2120
	}
2121

2122 2123
	nfs_fattr_map_and_free_names(server, &data->f_attr);

2124
	if (o_arg->open_flags & O_CREAT) {
2125
		update_changeattr(dir, &o_res->cinfo);
2126 2127 2128 2129 2130
		if (o_arg->open_flags & O_EXCL)
			data->file_created = 1;
		else if (o_res->cinfo.before != o_res->cinfo.after)
			data->file_created = 1;
	}
2131 2132
	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
		server->caps &= ~NFS_CAP_POSIX_LOCK;
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	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2134
		status = _nfs4_proc_open_confirm(data);
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		if (status != 0)
2136
			return status;
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	}
	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2139
		nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2140
	return 0;
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}

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static int nfs4_recover_expired_lease(struct nfs_server *server)
{
	return nfs4_client_recover_expired_lease(server->nfs_client);
}

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/*
 * OPEN_EXPIRED:
 * 	reclaim state on the server after a network partition.
 * 	Assumes caller holds the appropriate lock
 */
2153
static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
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{
2155
	struct nfs4_opendata *opendata;
2156
	int ret;
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2158
	opendata = nfs4_open_recoverdata_alloc(ctx, state,
2159
			NFS4_OPEN_CLAIM_FH);
2160 2161
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
2162
	ret = nfs4_open_recover(opendata, state);
2163
	if (ret == -ESTALE)
2164
		d_drop(ctx->dentry);
2165
	nfs4_opendata_put(opendata);
2166
	return ret;
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}

2169
static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2170
{
2171
	struct nfs_server *server = NFS_SERVER(state->inode);
2172 2173 2174 2175
	struct nfs4_exception exception = { };
	int err;

	do {
2176
		err = _nfs4_open_expired(ctx, state);
2177
		trace_nfs4_open_expired(ctx, 0, err);
2178 2179
		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
			continue;
2180 2181 2182 2183 2184 2185 2186 2187
		switch (err) {
		default:
			goto out;
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			nfs4_handle_exception(server, err, &exception);
			err = 0;
		}
2188
	} while (exception.retry);
2189
out:
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	return err;
}

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static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
	struct nfs_open_context *ctx;
2196
	int ret;
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	ctx = nfs4_state_find_open_context(state);
	if (IS_ERR(ctx))
2200
		return -EAGAIN;
2201
	ret = nfs4_do_open_expired(ctx, state);
2202 2203
	put_nfs_open_context(ctx);
	return ret;
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}

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static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
{
	nfs_remove_bad_delegation(state->inode);
	write_seqlock(&state->seqlock);
	nfs4_stateid_copy(&state->stateid, &state->open_stateid);
	write_sequnlock(&state->seqlock);
	clear_bit(NFS_DELEGATED_STATE, &state->flags);
}

static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
{
	if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
		nfs_finish_clear_delegation_stateid(state);
}

static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
	/* NFSv4.0 doesn't allow for delegation recovery on open expire */
	nfs40_clear_delegation_stateid(state);
	return nfs4_open_expired(sp, state);
}

2228
#if defined(CONFIG_NFS_V4_1)
2229
static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2230 2231
{
	struct nfs_server *server = NFS_SERVER(state->inode);
2232
	nfs4_stateid stateid;
2233
	struct nfs_delegation *delegation;
2234 2235
	struct rpc_cred *cred;
	int status;
2236

2237 2238 2239
	/* Get the delegation credential for use by test/free_stateid */
	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2240
	if (delegation == NULL) {
2241
		rcu_read_unlock();
2242 2243 2244 2245 2246 2247 2248 2249
		return;
	}

	nfs4_stateid_copy(&stateid, &delegation->stateid);
	cred = get_rpccred(delegation->cred);
	rcu_read_unlock();
	status = nfs41_test_stateid(server, &stateid, cred);
	trace_nfs4_test_delegation_stateid(state, NULL, status);
2250

2251 2252 2253 2254
	if (status != NFS_OK) {
		/* Free the stateid unless the server explicitly
		 * informs us the stateid is unrecognized. */
		if (status != -NFS4ERR_BAD_STATEID)
2255 2256
			nfs41_free_stateid(server, &stateid, cred);
		nfs_finish_clear_delegation_stateid(state);
2257
	}
2258

2259
	put_rpccred(cred);
2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
}

/**
 * nfs41_check_open_stateid - possibly free an open stateid
 *
 * @state: NFSv4 state for an inode
 *
 * Returns NFS_OK if recovery for this stateid is now finished.
 * Otherwise a negative NFS4ERR value is returned.
 */
static int nfs41_check_open_stateid(struct nfs4_state *state)
{
	struct nfs_server *server = NFS_SERVER(state->inode);
2273
	nfs4_stateid *stateid = &state->open_stateid;
2274
	struct rpc_cred *cred = state->owner->so_cred;
2275 2276 2277 2278 2279 2280 2281 2282
	int status;

	/* If a state reset has been done, test_stateid is unneeded */
	if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
	    (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
	    (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
		return -NFS4ERR_BAD_STATEID;

2283
	status = nfs41_test_stateid(server, stateid, cred);
2284
	trace_nfs4_test_open_stateid(state, NULL, status);
2285 2286 2287 2288
	if (status != NFS_OK) {
		/* Free the stateid unless the server explicitly
		 * informs us the stateid is unrecognized. */
		if (status != -NFS4ERR_BAD_STATEID)
2289
			nfs41_free_stateid(server, stateid, cred);
2290 2291 2292 2293

		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
		clear_bit(NFS_O_RDWR_STATE, &state->flags);
2294
		clear_bit(NFS_OPEN_STATE, &state->flags);
2295 2296 2297 2298 2299 2300
	}
	return status;
}

static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
2301
	int status;
2302

2303
	nfs41_check_delegation_stateid(state);
2304
	status = nfs41_check_open_stateid(state);
2305 2306 2307
	if (status != NFS_OK)
		status = nfs4_open_expired(sp, state);
	return status;
2308 2309 2310
}
#endif

2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
/*
 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
 * fields corresponding to attributes that were used to store the verifier.
 * Make sure we clobber those fields in the later setattr call
 */
static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
{
	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
	    !(sattr->ia_valid & ATTR_ATIME_SET))
		sattr->ia_valid |= ATTR_ATIME;

	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
	    !(sattr->ia_valid & ATTR_MTIME_SET))
		sattr->ia_valid |= ATTR_MTIME;
}

2327 2328 2329
static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
		fmode_t fmode,
		int flags,
2330
		struct nfs_open_context *ctx)
2331 2332 2333
{
	struct nfs4_state_owner *sp = opendata->owner;
	struct nfs_server *server = sp->so_server;
2334
	struct dentry *dentry;
2335 2336 2337 2338 2339 2340 2341
	struct nfs4_state *state;
	unsigned int seq;
	int ret;

	seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);

	ret = _nfs4_proc_open(opendata);
2342
	if (ret != 0)
2343 2344 2345 2346 2347 2348 2349 2350 2351
		goto out;

	state = nfs4_opendata_to_nfs4_state(opendata);
	ret = PTR_ERR(state);
	if (IS_ERR(state))
		goto out;
	if (server->caps & NFS_CAP_POSIX_LOCK)
		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);

2352
	dentry = opendata->dentry;
2353
	if (d_really_is_negative(dentry)) {
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363
		/* FIXME: Is this d_drop() ever needed? */
		d_drop(dentry);
		dentry = d_add_unique(dentry, igrab(state->inode));
		if (dentry == NULL) {
			dentry = opendata->dentry;
		} else if (dentry != ctx->dentry) {
			dput(ctx->dentry);
			ctx->dentry = dget(dentry);
		}
		nfs_set_verifier(dentry,
2364
				nfs_save_change_attribute(d_inode(opendata->dir)));
2365 2366
	}

2367 2368 2369 2370
	ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
	if (ret != 0)
		goto out;

2371
	ctx->state = state;
2372
	if (d_inode(dentry) == state->inode) {
2373 2374 2375 2376
		nfs_inode_attach_open_context(ctx);
		if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
			nfs4_schedule_stateid_recovery(server, state);
	}
2377 2378 2379 2380
out:
	return ret;
}

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/*
2382
 * Returns a referenced nfs4_state
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 */
2384
static int _nfs4_do_open(struct inode *dir,
2385
			struct nfs_open_context *ctx,
2386 2387
			int flags,
			struct iattr *sattr,
2388 2389
			struct nfs4_label *label,
			int *opened)
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{
	struct nfs4_state_owner  *sp;
	struct nfs4_state     *state = NULL;
	struct nfs_server       *server = NFS_SERVER(dir);
2394
	struct nfs4_opendata *opendata;
2395 2396 2397 2398
	struct dentry *dentry = ctx->dentry;
	struct rpc_cred *cred = ctx->cred;
	struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
	fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2399
	enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2400
	struct nfs4_label *olabel = NULL;
2401
	int status;
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2402 2403 2404

	/* Protect against reboot recovery conflicts */
	status = -ENOMEM;
2405 2406
	sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
	if (sp == NULL) {
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		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
		goto out_err;
	}
2410 2411
	status = nfs4_recover_expired_lease(server);
	if (status != 0)
2412
		goto err_put_state_owner;
2413 2414
	if (d_really_is_positive(dentry))
		nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2415
	status = -ENOMEM;
2416
	if (d_really_is_positive(dentry))
2417
		claim = NFS4_OPEN_CLAIM_FH;
2418
	opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2419
			label, claim, GFP_KERNEL);
2420
	if (opendata == NULL)
2421
		goto err_put_state_owner;
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2423 2424 2425 2426 2427 2428 2429 2430
	if (label) {
		olabel = nfs4_label_alloc(server, GFP_KERNEL);
		if (IS_ERR(olabel)) {
			status = PTR_ERR(olabel);
			goto err_opendata_put;
		}
	}

2431 2432 2433 2434 2435 2436
	if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
		if (!opendata->f_attr.mdsthreshold) {
			opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
			if (!opendata->f_attr.mdsthreshold)
				goto err_free_label;
		}
2437
		opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2438
	}
2439 2440
	if (d_really_is_positive(dentry))
		opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2441

2442
	status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2443
	if (status != 0)
2444
		goto err_free_label;
2445
	state = ctx->state;
2446

2447
	if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2448
	    (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2449 2450 2451 2452 2453
		nfs4_exclusive_attrset(opendata, sattr);

		nfs_fattr_init(opendata->o_res.f_attr);
		status = nfs4_do_setattr(state->inode, cred,
				opendata->o_res.f_attr, sattr,
2454 2455
				state, label, olabel);
		if (status == 0) {
2456 2457
			nfs_setattr_update_inode(state->inode, sattr,
					opendata->o_res.f_attr);
2458
			nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2459
		}
2460
	}
2461 2462
	if (opendata->file_created)
		*opened |= FILE_CREATED;
2463

2464
	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2465
		*ctx_th = opendata->f_attr.mdsthreshold;
2466 2467
		opendata->f_attr.mdsthreshold = NULL;
	}
2468

2469 2470
	nfs4_label_free(olabel);

2471
	nfs4_opendata_put(opendata);
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	nfs4_put_state_owner(sp);
	return 0;
2474 2475
err_free_label:
	nfs4_label_free(olabel);
2476 2477
err_opendata_put:
	nfs4_opendata_put(opendata);
2478 2479
err_put_state_owner:
	nfs4_put_state_owner(sp);
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out_err:
	return status;
}


2485
static struct nfs4_state *nfs4_do_open(struct inode *dir,
2486
					struct nfs_open_context *ctx,
2487 2488
					int flags,
					struct iattr *sattr,
2489 2490
					struct nfs4_label *label,
					int *opened)
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{
2492
	struct nfs_server *server = NFS_SERVER(dir);
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	struct nfs4_exception exception = { };
	struct nfs4_state *res;
	int status;

	do {
2498
		status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2499
		res = ctx->state;
2500
		trace_nfs4_open_file(ctx, flags, status);
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		if (status == 0)
			break;
		/* NOTE: BAD_SEQID means the server and client disagree about the
		 * book-keeping w.r.t. state-changing operations
		 * (OPEN/CLOSE/LOCK/LOCKU...)
		 * It is actually a sign of a bug on the client or on the server.
		 *
		 * If we receive a BAD_SEQID error in the particular case of
2509
		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
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		 * have unhashed the old state_owner for us, and that we can
		 * therefore safely retry using a new one. We should still warn
		 * the user though...
		 */
		if (status == -NFS4ERR_BAD_SEQID) {
2515
			pr_warn_ratelimited("NFS: v4 server %s "
2516 2517
					" returned a bad sequence-id error!\n",
					NFS_SERVER(dir)->nfs_client->cl_hostname);
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			exception.retry = 1;
			continue;
		}
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
		/*
		 * BAD_STATEID on OPEN means that the server cancelled our
		 * state before it received the OPEN_CONFIRM.
		 * Recover by retrying the request as per the discussion
		 * on Page 181 of RFC3530.
		 */
		if (status == -NFS4ERR_BAD_STATEID) {
			exception.retry = 1;
			continue;
		}
2531 2532 2533 2534 2535
		if (status == -EAGAIN) {
			/* We must have found a delegation */
			exception.retry = 1;
			continue;
		}
2536 2537 2538
		if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
			continue;
		res = ERR_PTR(nfs4_handle_exception(server,
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					status, &exception));
	} while (exception.retry);
	return res;
}

2544 2545
static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
2546 2547
			    struct nfs4_state *state, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel)
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{
2549
	struct nfs_server *server = NFS_SERVER(inode);
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        struct nfs_setattrargs  arg = {
2551
                .fh             = NFS_FH(inode),
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                .iap            = sattr,
		.server		= server,
		.bitmask = server->attr_bitmask,
2555
		.label		= ilabel,
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        };
        struct nfs_setattrres  res = {
		.fattr		= fattr,
2559
		.label		= olabel,
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		.server		= server,
        };
        struct rpc_message msg = {
2563 2564 2565 2566
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
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        };
2568
	unsigned long timestamp = jiffies;
2569 2570
	fmode_t fmode;
	bool truncate;
2571
	int status;
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2573 2574 2575 2576
	arg.bitmask = nfs4_bitmask(server, ilabel);
	if (ilabel)
		arg.bitmask = nfs4_bitmask(server, olabel);

2577
	nfs_fattr_init(fattr);
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2579 2580 2581 2582 2583 2584
	/* Servers should only apply open mode checks for file size changes */
	truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
	fmode = truncate ? FMODE_WRITE : FMODE_READ;

	if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
		/* Use that stateid */
2585
	} else if (truncate && state != NULL) {
2586 2587 2588 2589
		struct nfs_lockowner lockowner = {
			.l_owner = current->files,
			.l_pid = current->tgid,
		};
2590 2591 2592 2593 2594
		if (!nfs4_valid_open_stateid(state))
			return -EBADF;
		if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
				&lockowner) == -EIO)
			return -EBADF;
2595
	} else
2596
		nfs4_stateid_copy(&arg.stateid, &zero_stateid);
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2597

2598
	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2599 2600
	if (status == 0 && state != NULL)
		renew_lease(server, timestamp);
2601
	return status;
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2602 2603
}

2604 2605
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			   struct nfs_fattr *fattr, struct iattr *sattr,
2606 2607
			   struct nfs4_state *state, struct nfs4_label *ilabel,
			   struct nfs4_label *olabel)
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2608
{
2609
	struct nfs_server *server = NFS_SERVER(inode);
2610 2611
	struct nfs4_exception exception = {
		.state = state,
2612
		.inode = inode,
2613
	};
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2614 2615
	int err;
	do {
2616
		err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2617
		trace_nfs4_setattr(inode, err);
2618 2619
		switch (err) {
		case -NFS4ERR_OPENMODE:
2620 2621 2622 2623 2624 2625 2626
			if (!(sattr->ia_valid & ATTR_SIZE)) {
				pr_warn_once("NFSv4: server %s is incorrectly "
						"applying open mode checks to "
						"a SETATTR that is not "
						"changing file size.\n",
						server->nfs_client->cl_hostname);
			}
2627 2628 2629 2630 2631 2632 2633 2634
			if (state && !(state->state & FMODE_WRITE)) {
				err = -EBADF;
				if (sattr->ia_valid & ATTR_OPEN)
					err = -EACCES;
				goto out;
			}
		}
		err = nfs4_handle_exception(server, err, &exception);
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2635
	} while (exception.retry);
2636
out:
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2637 2638 2639 2640 2641 2642 2643 2644
	return err;
}

struct nfs4_closedata {
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
2645
	struct nfs_fattr fattr;
2646
	unsigned long timestamp;
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2647 2648
	bool roc;
	u32 roc_barrier;
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2649 2650
};

2651
static void nfs4_free_closedata(void *data)
2652
{
2653 2654
	struct nfs4_closedata *calldata = data;
	struct nfs4_state_owner *sp = calldata->state->owner;
2655
	struct super_block *sb = calldata->state->inode->i_sb;
2656

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2657 2658
	if (calldata->roc)
		pnfs_roc_release(calldata->state->inode);
2659 2660 2661
	nfs4_put_open_state(calldata->state);
	nfs_free_seqid(calldata->arg.seqid);
	nfs4_put_state_owner(sp);
2662
	nfs_sb_deactive(sb);
2663 2664 2665
	kfree(calldata);
}

2666
static void nfs4_close_done(struct rpc_task *task, void *data)
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2667
{
2668
	struct nfs4_closedata *calldata = data;
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2669 2670
	struct nfs4_state *state = calldata->state;
	struct nfs_server *server = NFS_SERVER(calldata->inode);
2671
	nfs4_stateid *res_stateid = NULL;
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2672

2673
	dprintk("%s: begin!\n", __func__);
2674 2675
	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
		return;
2676
	trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
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2677 2678 2679 2680 2681
        /* hmm. we are done with the inode, and in the process of freeing
	 * the state_owner. we keep this around to process errors
	 */
	switch (task->tk_status) {
		case 0:
2682 2683
			res_stateid = &calldata->res.stateid;
			if (calldata->arg.fmode == 0 && calldata->roc)
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2684 2685
				pnfs_roc_set_barrier(state->inode,
						     calldata->roc_barrier);
2686
			renew_lease(server, calldata->timestamp);
2687
			break;
2688
		case -NFS4ERR_ADMIN_REVOKED:
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2689
		case -NFS4ERR_STALE_STATEID:
2690 2691
		case -NFS4ERR_OLD_STATEID:
		case -NFS4ERR_BAD_STATEID:
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2692
		case -NFS4ERR_EXPIRED:
2693
			if (!nfs4_stateid_match(&calldata->arg.stateid,
2694
						&state->open_stateid)) {
2695 2696 2697
				rpc_restart_call_prepare(task);
				goto out_release;
			}
2698
			if (calldata->arg.fmode == 0)
2699
				break;
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2700
		default:
2701
			if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2702
				rpc_restart_call_prepare(task);
2703 2704
				goto out_release;
			}
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2705
	}
2706 2707
	nfs_clear_open_stateid(state, &calldata->arg.stateid,
			res_stateid, calldata->arg.fmode);
2708
out_release:
2709
	nfs_release_seqid(calldata->arg.seqid);
2710
	nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2711
	dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
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}

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2714
static void nfs4_close_prepare(struct rpc_task *task, void *data)
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2715
{
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2716
	struct nfs4_closedata *calldata = data;
2717
	struct nfs4_state *state = calldata->state;
2718
	struct inode *inode = calldata->inode;
2719
	bool is_rdonly, is_wronly, is_rdwr;
2720
	int call_close = 0;
2721

2722
	dprintk("%s: begin!\n", __func__);
2723
	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2724
		goto out_wait;
2725

2726
	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2727
	spin_lock(&state->owner->so_lock);
2728 2729 2730
	is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
	is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
	is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2731
	nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2732
	/* Calculate the change in open mode */
2733
	calldata->arg.fmode = 0;
2734
	if (state->n_rdwr == 0) {
2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748
		if (state->n_rdonly == 0)
			call_close |= is_rdonly;
		else if (is_rdonly)
			calldata->arg.fmode |= FMODE_READ;
		if (state->n_wronly == 0)
			call_close |= is_wronly;
		else if (is_wronly)
			calldata->arg.fmode |= FMODE_WRITE;
	} else if (is_rdwr)
		calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;

	if (calldata->arg.fmode == 0)
		call_close |= is_rdwr;

2749 2750
	if (!nfs4_valid_open_stateid(state))
		call_close = 0;
2751
	spin_unlock(&state->owner->so_lock);
2752 2753

	if (!call_close) {
2754
		/* Note: exit _without_ calling nfs4_close_done */
2755
		goto out_no_action;
2756
	}
2757

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2758
	if (calldata->arg.fmode == 0) {
2759
		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
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2760
		if (calldata->roc &&
2761 2762
		    pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
			nfs_release_seqid(calldata->arg.seqid);
2763
			goto out_wait;
2764
		    }
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2765
	}
2766 2767 2768
	calldata->arg.share_access =
		nfs4_map_atomic_open_share(NFS_SERVER(inode),
				calldata->arg.fmode, 0);
2769

2770
	nfs_fattr_init(calldata->res.fattr);
2771
	calldata->timestamp = jiffies;
2772
	if (nfs4_setup_sequence(NFS_SERVER(inode),
2773 2774
				&calldata->arg.seq_args,
				&calldata->res.seq_res,
2775 2776
				task) != 0)
		nfs_release_seqid(calldata->arg.seqid);
2777
	dprintk("%s: done!\n", __func__);
2778 2779 2780 2781 2782
	return;
out_no_action:
	task->tk_action = NULL;
out_wait:
	nfs4_sequence_done(task, &calldata->res.seq_res);
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2783 2784
}

2785
static const struct rpc_call_ops nfs4_close_ops = {
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2786
	.rpc_call_prepare = nfs4_close_prepare,
2787 2788 2789 2790
	.rpc_call_done = nfs4_close_done,
	.rpc_release = nfs4_free_closedata,
};

2791 2792
static bool nfs4_roc(struct inode *inode)
{
2793
	if (!nfs_have_layout(inode))
2794 2795 2796 2797
		return false;
	return pnfs_roc(inode);
}

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2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808
/* 
 * It is possible for data to be read/written from a mem-mapped file 
 * after the sys_close call (which hits the vfs layer as a flush).
 * This means that we can't safely call nfsv4 close on a file until 
 * the inode is cleared. This in turn means that we are not good
 * NFSv4 citizens - we do not indicate to the server to update the file's 
 * share state even when we are done with one of the three share 
 * stateid's in the inode.
 *
 * NOTE: Caller must be holding the sp->so_owner semaphore!
 */
2809
int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
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2810
{
2811
	struct nfs_server *server = NFS_SERVER(state->inode);
2812
	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
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2813
	struct nfs4_closedata *calldata;
2814 2815
	struct nfs4_state_owner *sp = state->owner;
	struct rpc_task *task;
2816 2817 2818 2819
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
		.rpc_cred = state->owner->so_cred,
	};
2820 2821
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
2822
		.rpc_message = &msg,
2823
		.callback_ops = &nfs4_close_ops,
2824
		.workqueue = nfsiod_workqueue,
2825 2826
		.flags = RPC_TASK_ASYNC,
	};
2827
	int status = -ENOMEM;
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2828

2829 2830 2831
	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
		&task_setup_data.rpc_client, &msg);

2832
	calldata = kzalloc(sizeof(*calldata), gfp_mask);
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2833
	if (calldata == NULL)
2834
		goto out;
2835
	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2836
	calldata->inode = state->inode;
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2837
	calldata->state = state;
2838
	calldata->arg.fh = NFS_FH(state->inode);
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2839
	/* Serialization for the sequence id */
2840 2841
	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
	calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2842
	if (IS_ERR(calldata->arg.seqid))
2843
		goto out_free_calldata;
2844
	calldata->arg.fmode = 0;
2845
	calldata->arg.bitmask = server->cache_consistency_bitmask;
2846
	calldata->res.fattr = &calldata->fattr;
2847
	calldata->res.seqid = calldata->arg.seqid;
2848
	calldata->res.server = server;
2849
	calldata->roc = nfs4_roc(state->inode);
2850
	nfs_sb_active(calldata->inode->i_sb);
2851

2852 2853
	msg.rpc_argp = &calldata->arg;
	msg.rpc_resp = &calldata->res;
2854 2855
	task_setup_data.callback_data = calldata;
	task = rpc_run_task(&task_setup_data);
2856 2857
	if (IS_ERR(task))
		return PTR_ERR(task);
2858 2859 2860
	status = 0;
	if (wait)
		status = rpc_wait_for_completion_task(task);
2861
	rpc_put_task(task);
2862
	return status;
2863 2864 2865
out_free_calldata:
	kfree(calldata);
out:
2866 2867
	nfs4_put_open_state(state);
	nfs4_put_state_owner(sp);
2868
	return status;
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2869 2870
}

2871
static struct inode *
2872 2873
nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
		int open_flags, struct iattr *attr, int *opened)
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2874 2875
{
	struct nfs4_state *state;
2876 2877 2878
	struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;

	label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
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2879

2880
	/* Protect against concurrent sillydeletes */
2881
	state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2882 2883 2884

	nfs4_label_release_security(label);

2885 2886
	if (IS_ERR(state))
		return ERR_CAST(state);
2887
	return state->inode;
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}

2890
static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
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{
	if (ctx->state == NULL)
		return;
	if (is_sync)
2895
		nfs4_close_sync(ctx->state, ctx->mode);
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2896
	else
2897
		nfs4_close_state(ctx->state, ctx->mode);
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}
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2899

2900 2901
#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2902
#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2903

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2904 2905
static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
2906 2907 2908
	struct nfs4_server_caps_arg args = {
		.fhandle = fhandle,
	};
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	struct nfs4_server_caps_res res = {};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2912
		.rpc_argp = &args,
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		.rpc_resp = &res,
	};
	int status;

2917
	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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2918
	if (status == 0) {
2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930
		/* Sanity check the server answers */
		switch (server->nfs_client->cl_minorversion) {
		case 0:
			res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
			res.attr_bitmask[2] = 0;
			break;
		case 1:
			res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
			break;
		case 2:
			res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
		}
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		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2932 2933 2934 2935
		server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
				NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
				NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
				NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2936 2937
				NFS_CAP_CTIME|NFS_CAP_MTIME|
				NFS_CAP_SECURITY_LABEL);
2938 2939
		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
				res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
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			server->caps |= NFS_CAP_ACLS;
		if (res.has_links != 0)
			server->caps |= NFS_CAP_HARDLINKS;
		if (res.has_symlinks != 0)
			server->caps |= NFS_CAP_SYMLINKS;
2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960
		if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
			server->caps |= NFS_CAP_FILEID;
		if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
			server->caps |= NFS_CAP_MODE;
		if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
			server->caps |= NFS_CAP_NLINK;
		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
			server->caps |= NFS_CAP_OWNER;
		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
			server->caps |= NFS_CAP_OWNER_GROUP;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
			server->caps |= NFS_CAP_ATIME;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
			server->caps |= NFS_CAP_CTIME;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
			server->caps |= NFS_CAP_MTIME;
2961 2962 2963 2964 2965 2966
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
		if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
			server->caps |= NFS_CAP_SECURITY_LABEL;
#endif
		memcpy(server->attr_bitmask_nl, res.attr_bitmask,
				sizeof(server->attr_bitmask));
2967
		server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2968

2969 2970 2971
		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2972
		server->cache_consistency_bitmask[2] = 0;
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2973
		server->acl_bitmask = res.acl_bitmask;
2974
		server->fh_expire_type = res.fh_expire_type;
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2975
	}
2976

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	return status;
}

2980
int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_server_capabilities(server, fhandle),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *info)
{
2995
	u32 bitmask[3];
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2996
	struct nfs4_lookup_root_arg args = {
2997
		.bitmask = bitmask,
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	};
	struct nfs4_lookup_res res = {
		.server = server,
3001
		.fattr = info->fattr,
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		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
3009

3010 3011 3012 3013 3014 3015 3016
	bitmask[0] = nfs4_fattr_bitmap[0];
	bitmask[1] = nfs4_fattr_bitmap[1];
	/*
	 * Process the label in the upcoming getfattr
	 */
	bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;

3017
	nfs_fattr_init(info->fattr);
3018
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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}

static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *info)
{
	struct nfs4_exception exception = { };
	int err;
	do {
3027
		err = _nfs4_lookup_root(server, fhandle, info);
3028
		trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3029 3030 3031
		switch (err) {
		case 0:
		case -NFS4ERR_WRONGSEC:
3032
			goto out;
3033 3034 3035
		default:
			err = nfs4_handle_exception(server, err, &exception);
		}
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3036
	} while (exception.retry);
3037
out:
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	return err;
}

3041 3042 3043
static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
				struct nfs_fsinfo *info, rpc_authflavor_t flavor)
{
3044 3045 3046
	struct rpc_auth_create_args auth_args = {
		.pseudoflavor = flavor,
	};
3047 3048 3049
	struct rpc_auth *auth;
	int ret;

3050
	auth = rpcauth_create(&auth_args, server->client);
3051
	if (IS_ERR(auth)) {
3052
		ret = -EACCES;
3053 3054 3055 3056 3057 3058 3059
		goto out;
	}
	ret = nfs4_lookup_root(server, fhandle, info);
out:
	return ret;
}

3060 3061 3062 3063 3064 3065 3066 3067 3068
/*
 * Retry pseudoroot lookup with various security flavors.  We do this when:
 *
 *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
 *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
 *
 * Returns zero on success, or a negative NFS4ERR value, or a
 * negative errno value.
 */
3069
static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3070
			      struct nfs_fsinfo *info)
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3071
{
3072 3073 3074 3075 3076
	/* Per 3530bis 15.33.5 */
	static const rpc_authflavor_t flav_array[] = {
		RPC_AUTH_GSS_KRB5P,
		RPC_AUTH_GSS_KRB5I,
		RPC_AUTH_GSS_KRB5,
3077
		RPC_AUTH_UNIX,			/* courtesy */
3078 3079 3080 3081
		RPC_AUTH_NULL,
	};
	int status = -EPERM;
	size_t i;
3082

3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100
	if (server->auth_info.flavor_len > 0) {
		/* try each flavor specified by user */
		for (i = 0; i < server->auth_info.flavor_len; i++) {
			status = nfs4_lookup_root_sec(server, fhandle, info,
						server->auth_info.flavors[i]);
			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
				continue;
			break;
		}
	} else {
		/* no flavors specified by user, try default list */
		for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
			status = nfs4_lookup_root_sec(server, fhandle, info,
						      flav_array[i]);
			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
				continue;
			break;
		}
3101
	}
3102

3103 3104 3105 3106 3107 3108 3109 3110 3111
	/*
	 * -EACCESS could mean that the user doesn't have correct permissions
	 * to access the mount.  It could also mean that we tried to mount
	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
	 * existing mount programs don't handle -EACCES very well so it should
	 * be mapped to -EPERM instead.
	 */
	if (status == -EACCES)
		status = -EPERM;
3112 3113 3114
	return status;
}

3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
static int nfs4_do_find_root_sec(struct nfs_server *server,
		struct nfs_fh *fhandle, struct nfs_fsinfo *info)
{
	int mv = server->nfs_client->cl_minorversion;
	return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
}

/**
 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
 * @server: initialized nfs_server handle
 * @fhandle: we fill in the pseudo-fs root file handle
 * @info: we fill in an FSINFO struct
3127
 * @auth_probe: probe the auth flavours
3128 3129
 *
 * Returns zero on success, or a negative errno.
3130
 */
3131
int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3132 3133
			 struct nfs_fsinfo *info,
			 bool auth_probe)
3134
{
3135
	int status = 0;
3136

3137
	if (!auth_probe)
3138
		status = nfs4_lookup_root(server, fhandle, info);
3139 3140

	if (auth_probe || status == NFS4ERR_WRONGSEC)
3141 3142
		status = nfs4_do_find_root_sec(server, fhandle, info);

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	if (status == 0)
		status = nfs4_server_capabilities(server, fhandle);
	if (status == 0)
		status = nfs4_do_fsinfo(server, fhandle, info);
3147

3148
	return nfs4_map_errors(status);
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}

3151 3152 3153 3154 3155
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
			      struct nfs_fsinfo *info)
{
	int error;
	struct nfs_fattr *fattr = info->fattr;
3156
	struct nfs4_label *label = NULL;
3157 3158 3159 3160 3161 3162 3163

	error = nfs4_server_capabilities(server, mntfh);
	if (error < 0) {
		dprintk("nfs4_get_root: getcaps error = %d\n", -error);
		return error;
	}

3164 3165 3166 3167
	label = nfs4_label_alloc(server, GFP_KERNEL);
	if (IS_ERR(label))
		return PTR_ERR(label);

3168
	error = nfs4_proc_getattr(server, mntfh, fattr, label);
3169 3170
	if (error < 0) {
		dprintk("nfs4_get_root: getattr error = %d\n", -error);
3171
		goto err_free_label;
3172 3173 3174 3175 3176 3177
	}

	if (fattr->valid & NFS_ATTR_FATTR_FSID &&
	    !nfs_fsid_equal(&server->fsid, &fattr->fsid))
		memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));

3178 3179 3180
err_free_label:
	nfs4_label_free(label);

3181 3182 3183
	return error;
}

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/*
 * Get locations and (maybe) other attributes of a referral.
 * Note that we'll actually follow the referral later when
 * we detect fsid mismatch in inode revalidation
 */
3189 3190 3191
static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
			     const struct qstr *name, struct nfs_fattr *fattr,
			     struct nfs_fh *fhandle)
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{
	int status = -ENOMEM;
	struct page *page = NULL;
	struct nfs4_fs_locations *locations = NULL;

	page = alloc_page(GFP_KERNEL);
	if (page == NULL)
		goto out;
	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
	if (locations == NULL)
		goto out;

3204
	status = nfs4_proc_fs_locations(client, dir, name, locations, page);
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	if (status != 0)
		goto out;
3207 3208 3209 3210 3211 3212

	/*
	 * If the fsid didn't change, this is a migration event, not a
	 * referral.  Cause us to drop into the exception handler, which
	 * will kick off migration recovery.
	 */
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3213
	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3214 3215
		dprintk("%s: server did not return a different fsid for"
			" a referral at %s\n", __func__, name->name);
3216
		status = -NFS4ERR_MOVED;
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3217 3218
		goto out;
	}
3219 3220
	/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
	nfs_fixup_referral_attributes(&locations->fattr);
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3221

3222
	/* replace the lookup nfs_fattr with the locations nfs_fattr */
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3223 3224 3225 3226 3227
	memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
	memset(fhandle, 0, sizeof(struct nfs_fh));
out:
	if (page)
		__free_page(page);
3228
	kfree(locations);
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3229 3230 3231
	return status;
}

3232 3233
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
				struct nfs_fattr *fattr, struct nfs4_label *label)
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{
	struct nfs4_getattr_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_getattr_res res = {
		.fattr = fattr,
3241
		.label = label,
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		.server = server,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
3249 3250 3251

	args.bitmask = nfs4_bitmask(server, label);

3252
	nfs_fattr_init(fattr);
3253
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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}

3256 3257
static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
				struct nfs_fattr *fattr, struct nfs4_label *label)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
3262 3263 3264
		err = _nfs4_proc_getattr(server, fhandle, fattr, label);
		trace_nfs4_getattr(server, fhandle, fattr, err);
		err = nfs4_handle_exception(server, err,
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				&exception);
	} while (exception.retry);
	return err;
}

/* 
 * The file is not closed if it is opened due to the a request to change
 * the size of the file. The open call will not be needed once the
 * VFS layer lookup-intents are implemented.
 *
 * Close is called when the inode is destroyed.
 * If we haven't opened the file for O_WRONLY, we
 * need to in the size_change case to obtain a stateid.
 *
 * Got race?
 * Because OPEN is always done by name in nfsv4, it is
 * possible that we opened a different file by the same
 * name.  We can recognize this race condition, but we
 * can't do anything about it besides returning an error.
 *
 * This will be fixed with VFS changes (lookup-intent).
 */
static int
nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
		  struct iattr *sattr)
{
3291
	struct inode *inode = d_inode(dentry);
3292
	struct rpc_cred *cred = NULL;
3293
	struct nfs4_state *state = NULL;
3294
	struct nfs4_label *label = NULL;
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	int status;

3297 3298 3299
	if (pnfs_ld_layoutret_on_setattr(inode) &&
	    sattr->ia_valid & ATTR_SIZE &&
	    sattr->ia_size < i_size_read(inode))
3300
		pnfs_commit_and_return_layout(inode);
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3301

3302
	nfs_fattr_init(fattr);
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3303
	
3304 3305
	/* Deal with open(O_TRUNC) */
	if (sattr->ia_valid & ATTR_OPEN)
3306
		sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3307 3308

	/* Optimization: if the end result is no change, don't RPC */
3309
	if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3310 3311
		return 0;

3312
	/* Search for an existing open(O_WRITE) file */
3313 3314 3315 3316
	if (sattr->ia_valid & ATTR_FILE) {
		struct nfs_open_context *ctx;

		ctx = nfs_file_open_context(sattr->ia_file);
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3317 3318 3319 3320
		if (ctx) {
			cred = ctx->cred;
			state = ctx->state;
		}
3321
	}
3322

3323 3324 3325 3326 3327
	label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
	if (IS_ERR(label))
		return PTR_ERR(label);

	status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3328
	if (status == 0) {
3329
		nfs_setattr_update_inode(inode, sattr, fattr);
3330 3331
		nfs_setsecurity(inode, fattr, label);
	}
3332
	nfs4_label_free(label);
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	return status;
}

3336 3337
static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
		const struct qstr *name, struct nfs_fh *fhandle,
3338
		struct nfs_fattr *fattr, struct nfs4_label *label)
3339
{
3340
	struct nfs_server *server = NFS_SERVER(dir);
3341 3342 3343
	int		       status;
	struct nfs4_lookup_arg args = {
		.bitmask = server->attr_bitmask,
3344
		.dir_fh = NFS_FH(dir),
3345 3346 3347 3348 3349
		.name = name,
	};
	struct nfs4_lookup_res res = {
		.server = server,
		.fattr = fattr,
3350
		.label = label,
3351 3352 3353 3354 3355 3356 3357 3358
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};

3359 3360
	args.bitmask = nfs4_bitmask(server, label);

3361 3362
	nfs_fattr_init(fattr);

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3363
	dprintk("NFS call  lookup %s\n", name->name);
3364
	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
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	dprintk("NFS reply lookup: %d\n", status);
	return status;
}

3369
static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3370 3371
{
	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3372
		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3373 3374 3375 3376
	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	fattr->nlink = 2;
}

3377 3378
static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
				   struct qstr *name, struct nfs_fh *fhandle,
3379
				   struct nfs_fattr *fattr, struct nfs4_label *label)
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3380 3381
{
	struct nfs4_exception exception = { };
3382
	struct rpc_clnt *client = *clnt;
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	int err;
	do {
3385
		err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3386
		trace_nfs4_lookup(dir, name, err);
3387
		switch (err) {
3388
		case -NFS4ERR_BADNAME:
3389 3390
			err = -ENOENT;
			goto out;
3391
		case -NFS4ERR_MOVED:
3392
			err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3393 3394
			if (err == -NFS4ERR_MOVED)
				err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3395
			goto out;
3396
		case -NFS4ERR_WRONGSEC:
3397 3398 3399
			err = -EPERM;
			if (client != *clnt)
				goto out;
3400
			client = nfs4_negotiate_security(client, dir, name);
3401 3402 3403 3404 3405 3406 3407
			if (IS_ERR(client))
				return PTR_ERR(client);

			exception.retry = 1;
			break;
		default:
			err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3408
		}
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	} while (exception.retry);
3410 3411 3412 3413 3414 3415 3416

out:
	if (err == 0)
		*clnt = client;
	else if (client != *clnt)
		rpc_shutdown_client(client);

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	return err;
}

3420
static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3421 3422
			    struct nfs_fh *fhandle, struct nfs_fattr *fattr,
			    struct nfs4_label *label)
3423 3424 3425 3426
{
	int status;
	struct rpc_clnt *client = NFS_CLIENT(dir);

3427
	status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3428 3429 3430 3431 3432 3433 3434
	if (client != NFS_CLIENT(dir)) {
		rpc_shutdown_client(client);
		nfs_fixup_secinfo_attributes(fattr);
	}
	return status;
}

3435 3436 3437 3438
struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
3439
	struct rpc_clnt *client = NFS_CLIENT(dir);
3440 3441
	int status;

3442
	status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3443
	if (status < 0)
3444
		return ERR_PTR(status);
3445
	return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3446 3447
}

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static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
3450
	struct nfs_server *server = NFS_SERVER(inode);
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	struct nfs4_accessargs args = {
		.fh = NFS_FH(inode),
3453
		.bitmask = server->cache_consistency_bitmask,
3454 3455 3456
	};
	struct nfs4_accessres res = {
		.server = server,
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	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = entry->cred,
	};
	int mode = entry->mask;
3465
	int status = 0;
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	/*
	 * Determine which access bits we want to ask for...
	 */
	if (mode & MAY_READ)
		args.access |= NFS4_ACCESS_READ;
	if (S_ISDIR(inode->i_mode)) {
		if (mode & MAY_WRITE)
			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
		if (mode & MAY_EXEC)
			args.access |= NFS4_ACCESS_LOOKUP;
	} else {
		if (mode & MAY_WRITE)
			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
		if (mode & MAY_EXEC)
			args.access |= NFS4_ACCESS_EXECUTE;
	}
3483 3484 3485 3486 3487

	res.fattr = nfs_alloc_fattr();
	if (res.fattr == NULL)
		return -ENOMEM;

3488
	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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3489
	if (!status) {
3490
		nfs_access_set_mask(entry, res.access);
3491
		nfs_refresh_inode(inode, res.fattr);
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3492
	}
3493
	nfs_free_fattr(res.fattr);
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	return status;
}

static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
	struct nfs4_exception exception = { };
	int err;
	do {
3502 3503 3504
		err = _nfs4_proc_access(inode, entry);
		trace_nfs4_access(inode, err);
		err = nfs4_handle_exception(NFS_SERVER(inode), err,
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				&exception);
	} while (exception.retry);
	return err;
}

/*
 * TODO: For the time being, we don't try to get any attributes
 * along with any of the zero-copy operations READ, READDIR,
 * READLINK, WRITE.
 *
 * In the case of the first three, we want to put the GETATTR
 * after the read-type operation -- this is because it is hard
 * to predict the length of a GETATTR response in v4, and thus
 * align the READ data correctly.  This means that the GETATTR
 * may end up partially falling into the page cache, and we should
 * shift it into the 'tail' of the xdr_buf before processing.
 * To do this efficiently, we need to know the total length
 * of data received, which doesn't seem to be available outside
 * of the RPC layer.
 *
 * In the case of WRITE, we also want to put the GETATTR after
 * the operation -- in this case because we want to make sure
3527
 * we get the post-operation mtime and size.
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 *
 * Both of these changes to the XDR layer would in fact be quite
 * minor, but I decided to leave them for a subsequent patch.
 */
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs4_readlink args = {
		.fh       = NFS_FH(inode),
		.pgbase	  = pgbase,
		.pglen    = pglen,
		.pages    = &page,
	};
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3541
	struct nfs4_readlink_res res;
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
		.rpc_argp = &args,
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3545
		.rpc_resp = &res,
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	};

3548
	return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
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}

static int nfs4_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs4_exception exception = { };
	int err;
	do {
3557 3558 3559
		err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
		trace_nfs4_readlink(inode, err);
		err = nfs4_handle_exception(NFS_SERVER(inode), err,
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3560 3561 3562 3563 3564 3565
				&exception);
	} while (exception.retry);
	return err;
}

/*
3566
 * This is just for mknod.  open(O_CREAT) will always do ->open_context().
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 */
static int
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3570
		 int flags)
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3571
{
3572
	struct nfs4_label l, *ilabel = NULL;
3573
	struct nfs_open_context *ctx;
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3574
	struct nfs4_state *state;
3575
	int opened = 0;
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3576 3577
	int status = 0;

3578 3579 3580 3581
	ctx = alloc_nfs_open_context(dentry, FMODE_READ);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

3582 3583
	ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);

3584
	sattr->ia_mode &= ~current_umask();
3585
	state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
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3586 3587
	if (IS_ERR(state)) {
		status = PTR_ERR(state);
3588
		goto out;
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	}
out:
3591
	nfs4_label_release_security(ilabel);
3592
	put_nfs_open_context(ctx);
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	return status;
}

static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
3598
	struct nfs_server *server = NFS_SERVER(dir);
3599
	struct nfs_removeargs args = {
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3600
		.fh = NFS_FH(dir),
3601
		.name = *name,
3602
	};
3603
	struct nfs_removeres res = {
3604
		.server = server,
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	};
	struct rpc_message msg = {
3607 3608 3609
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
		.rpc_argp = &args,
		.rpc_resp = &res,
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3610
	};
3611
	int status;
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3612

3613
	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3614
	if (status == 0)
3615
		update_changeattr(dir, &res.cinfo);
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	return status;
}

static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
	struct nfs4_exception exception = { };
	int err;
	do {
3624 3625 3626
		err = _nfs4_proc_remove(dir, name);
		trace_nfs4_remove(dir, name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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				&exception);
	} while (exception.retry);
	return err;
}

3632
static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
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3633
{
3634 3635 3636
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_removeargs *args = msg->rpc_argp;
	struct nfs_removeres *res = msg->rpc_resp;
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3637

3638
	res->server = server;
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3639
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3640
	nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3641 3642

	nfs_fattr_init(res->dir_attr);
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}

3645 3646
static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
{
3647 3648 3649 3650
	nfs4_setup_sequence(NFS_SERVER(data->dir),
			&data->args.seq_args,
			&data->res.seq_res,
			task);
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}

3653
static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
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3654
{
3655 3656
	struct nfs_unlinkdata *data = task->tk_calldata;
	struct nfs_removeres *res = &data->res;
3657

3658 3659
	if (!nfs4_sequence_done(task, &res->seq_res))
		return 0;
3660 3661
	if (nfs4_async_handle_error(task, res->server, NULL,
				    &data->timeout) == -EAGAIN)
3662 3663 3664
		return 0;
	update_changeattr(dir, &res->cinfo);
	return 1;
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3665 3666
}

3667 3668 3669 3670 3671 3672 3673 3674
static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
{
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_renameargs *arg = msg->rpc_argp;
	struct nfs_renameres *res = msg->rpc_resp;

	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
	res->server = server;
3675
	nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3676 3677
}

3678 3679
static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
{
3680 3681 3682 3683
	nfs4_setup_sequence(NFS_SERVER(data->old_dir),
			&data->args.seq_args,
			&data->res.seq_res,
			task);
3684 3685 3686 3687 3688
}

static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
				 struct inode *new_dir)
{
3689 3690
	struct nfs_renamedata *data = task->tk_calldata;
	struct nfs_renameres *res = &data->res;
3691 3692 3693

	if (!nfs4_sequence_done(task, &res->seq_res))
		return 0;
3694
	if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3695 3696 3697 3698 3699 3700 3701
		return 0;

	update_changeattr(old_dir, &res->old_cinfo);
	update_changeattr(new_dir, &res->new_cinfo);
	return 1;
}

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3702 3703
static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
3704
	struct nfs_server *server = NFS_SERVER(inode);
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3705 3706 3707 3708
	struct nfs4_link_arg arg = {
		.fh     = NFS_FH(inode),
		.dir_fh = NFS_FH(dir),
		.name   = name,
3709 3710 3711 3712
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_link_res res = {
		.server = server,
3713
		.label = NULL,
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	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
		.rpc_argp = &arg,
3718
		.rpc_resp = &res,
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3719
	};
3720 3721 3722
	int status = -ENOMEM;

	res.fattr = nfs_alloc_fattr();
3723
	if (res.fattr == NULL)
3724
		goto out;
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3725

3726 3727 3728 3729 3730
	res.label = nfs4_label_alloc(server, GFP_KERNEL);
	if (IS_ERR(res.label)) {
		status = PTR_ERR(res.label);
		goto out;
	}
3731
	arg.bitmask = nfs4_bitmask(server, res.label);
3732

3733
	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3734 3735
	if (!status) {
		update_changeattr(dir, &res.cinfo);
3736 3737 3738
		status = nfs_post_op_update_inode(inode, res.fattr);
		if (!status)
			nfs_setsecurity(inode, res.fattr, res.label);
3739
	}
3740 3741 3742 3743


	nfs4_label_free(res.label);

3744 3745
out:
	nfs_free_fattr(res.fattr);
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	return status;
}

static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(inode),
				_nfs4_proc_link(inode, dir, name),
				&exception);
	} while (exception.retry);
	return err;
}

3761 3762 3763 3764 3765 3766
struct nfs4_createdata {
	struct rpc_message msg;
	struct nfs4_create_arg arg;
	struct nfs4_create_res res;
	struct nfs_fh fh;
	struct nfs_fattr fattr;
3767
	struct nfs4_label *label;
3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778
};

static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
		struct qstr *name, struct iattr *sattr, u32 ftype)
{
	struct nfs4_createdata *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data != NULL) {
		struct nfs_server *server = NFS_SERVER(dir);

3779 3780 3781 3782
		data->label = nfs4_label_alloc(server, GFP_KERNEL);
		if (IS_ERR(data->label))
			goto out_free;

3783 3784 3785 3786 3787 3788 3789 3790
		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
		data->msg.rpc_argp = &data->arg;
		data->msg.rpc_resp = &data->res;
		data->arg.dir_fh = NFS_FH(dir);
		data->arg.server = server;
		data->arg.name = name;
		data->arg.attrs = sattr;
		data->arg.ftype = ftype;
3791
		data->arg.bitmask = nfs4_bitmask(server, data->label);
3792 3793 3794
		data->res.server = server;
		data->res.fh = &data->fh;
		data->res.fattr = &data->fattr;
3795
		data->res.label = data->label;
3796 3797 3798
		nfs_fattr_init(data->res.fattr);
	}
	return data;
3799 3800 3801
out_free:
	kfree(data);
	return NULL;
3802 3803 3804 3805
}

static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
{
3806
	int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3807
				    &data->arg.seq_args, &data->res.seq_res, 1);
3808 3809
	if (status == 0) {
		update_changeattr(dir, &data->res.dir_cinfo);
3810
		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3811 3812 3813 3814 3815 3816
	}
	return status;
}

static void nfs4_free_createdata(struct nfs4_createdata *data)
{
3817
	nfs4_label_free(data->label);
3818 3819 3820
	kfree(data);
}

3821
static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3822 3823
		struct page *page, unsigned int len, struct iattr *sattr,
		struct nfs4_label *label)
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3824
{
3825 3826
	struct nfs4_createdata *data;
	int status = -ENAMETOOLONG;
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3827

3828
	if (len > NFS4_MAXPATHLEN)
3829
		goto out;
3830

3831 3832 3833 3834 3835 3836 3837 3838
	status = -ENOMEM;
	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
	if (data == NULL)
		goto out;

	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
	data->arg.u.symlink.pages = &page;
	data->arg.u.symlink.len = len;
3839
	data->arg.label = label;
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3840
	
3841 3842 3843 3844
	status = nfs4_do_create(dir, dentry, data);

	nfs4_free_createdata(data);
out:
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3845 3846 3847
	return status;
}

3848
static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3849
		struct page *page, unsigned int len, struct iattr *sattr)
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3850 3851
{
	struct nfs4_exception exception = { };
3852
	struct nfs4_label l, *label = NULL;
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3853
	int err;
3854 3855 3856

	label = nfs4_label_init_security(dir, dentry, sattr, &l);

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3857
	do {
3858 3859 3860
		err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
		trace_nfs4_symlink(dir, &dentry->d_name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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3861 3862
				&exception);
	} while (exception.retry);
3863 3864

	nfs4_label_release_security(label);
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	return err;
}

static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3869
		struct iattr *sattr, struct nfs4_label *label)
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3870
{
3871 3872
	struct nfs4_createdata *data;
	int status = -ENOMEM;
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3873

3874 3875 3876 3877
	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
	if (data == NULL)
		goto out;

3878
	data->arg.label = label;
3879 3880 3881 3882
	status = nfs4_do_create(dir, dentry, data);

	nfs4_free_createdata(data);
out:
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	return status;
}

static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr)
{
	struct nfs4_exception exception = { };
3890
	struct nfs4_label l, *label = NULL;
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3891
	int err;
3892

3893 3894
	label = nfs4_label_init_security(dir, dentry, sattr, &l);

3895
	sattr->ia_mode &= ~current_umask();
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3896
	do {
3897 3898 3899
		err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
		trace_nfs4_mkdir(dir, &dentry->d_name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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3900 3901
				&exception);
	} while (exception.retry);
3902 3903
	nfs4_label_release_security(label);

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	return err;
}

static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3908
		u64 cookie, struct page **pages, unsigned int count, int plus)
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3909
{
3910
	struct inode		*dir = d_inode(dentry);
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	struct nfs4_readdir_arg args = {
		.fh = NFS_FH(dir),
3913
		.pages = pages,
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		.pgbase = 0,
		.count = count,
3916
		.bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
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3917
		.plus = plus,
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	};
	struct nfs4_readdir_res res;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};
	int			status;

3928 3929
	dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
			dentry,
3930
			(unsigned long long)cookie);
3931
	nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
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3932
	res.pgbase = args.pgbase;
3933
	status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3934
	if (status >= 0) {
3935
		memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3936 3937
		status += args.pgbase;
	}
3938 3939 3940

	nfs_invalidate_atime(dir);

3941
	dprintk("%s: returns %d\n", __func__, status);
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	return status;
}

static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3946
		u64 cookie, struct page **pages, unsigned int count, int plus)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
3951 3952
		err = _nfs4_proc_readdir(dentry, cred, cookie,
				pages, count, plus);
3953 3954
		trace_nfs4_readdir(d_inode(dentry), err);
		err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
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				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3961
		struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
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3962
{
3963 3964 3965
	struct nfs4_createdata *data;
	int mode = sattr->ia_mode;
	int status = -ENOMEM;
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3967 3968 3969 3970
	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
	if (data == NULL)
		goto out;

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3971
	if (S_ISFIFO(mode))
3972
		data->arg.ftype = NF4FIFO;
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3973
	else if (S_ISBLK(mode)) {
3974 3975 3976
		data->arg.ftype = NF4BLK;
		data->arg.u.device.specdata1 = MAJOR(rdev);
		data->arg.u.device.specdata2 = MINOR(rdev);
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	}
	else if (S_ISCHR(mode)) {
3979 3980 3981
		data->arg.ftype = NF4CHR;
		data->arg.u.device.specdata1 = MAJOR(rdev);
		data->arg.u.device.specdata2 = MINOR(rdev);
3982 3983 3984
	} else if (!S_ISSOCK(mode)) {
		status = -EINVAL;
		goto out_free;
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3985
	}
3986

3987
	data->arg.label = label;
3988
	status = nfs4_do_create(dir, dentry, data);
3989
out_free:
3990 3991
	nfs4_free_createdata(data);
out:
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	return status;
}

static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr, dev_t rdev)
{
	struct nfs4_exception exception = { };
3999
	struct nfs4_label l, *label = NULL;
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	int err;
4001

4002 4003
	label = nfs4_label_init_security(dir, dentry, sattr, &l);

4004
	sattr->ia_mode &= ~current_umask();
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4005
	do {
4006 4007 4008
		err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
		trace_nfs4_mknod(dir, &dentry->d_name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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				&exception);
	} while (exception.retry);
4011 4012 4013

	nfs4_label_release_security(label);

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	return err;
}

static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
		 struct nfs_fsstat *fsstat)
{
	struct nfs4_statfs_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
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	struct nfs4_statfs_res res = {
		.fsstat = fsstat,
	};
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
		.rpc_argp = &args,
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		.rpc_resp = &res,
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	};

4033
	nfs_fattr_init(fsstat->fattr);
4034
	return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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}

static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_proc_statfs(server, fhandle, fsstat),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *fsinfo)
{
	struct nfs4_fsinfo_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
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	struct nfs4_fsinfo_res res = {
		.fsinfo = fsinfo,
	};
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
		.rpc_argp = &args,
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		.rpc_resp = &res,
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	};

4065
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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}

static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
	struct nfs4_exception exception = { };
4071
	unsigned long now = jiffies;
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	int err;

	do {
4075
		err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4076
		trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4077 4078 4079 4080 4081 4082 4083 4084 4085 4086
		if (err == 0) {
			struct nfs_client *clp = server->nfs_client;

			spin_lock(&clp->cl_lock);
			clp->cl_lease_time = fsinfo->lease_time * HZ;
			clp->cl_last_renewal = now;
			spin_unlock(&clp->cl_lock);
			break;
		}
		err = nfs4_handle_exception(server, err, &exception);
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	} while (exception.retry);
	return err;
}

static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
4093 4094
	int error;

4095
	nfs_fattr_init(fsinfo->fattr);
4096
	error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4097 4098 4099
	if (error == 0) {
		/* block layout checks this! */
		server->pnfs_blksize = fsinfo->blksize;
4100
		set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4101
	}
4102 4103

	return error;
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}

static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_pathconf *pathconf)
{
	struct nfs4_pathconf_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
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	struct nfs4_pathconf_res res = {
		.pathconf = pathconf,
	};
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
		.rpc_argp = &args,
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		.rpc_resp = &res,
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	};

	/* None of the pathconf attributes are mandatory to implement */
	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
		memset(pathconf, 0, sizeof(*pathconf));
		return 0;
	}

4128
	nfs_fattr_init(pathconf->fattr);
4129
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
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}

static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_pathconf *pathconf)
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(server,
				_nfs4_proc_pathconf(server, fhandle, pathconf),
				&exception);
	} while (exception.retry);
	return err;
}

4146
int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4147 4148 4149 4150 4151 4152 4153 4154
		const struct nfs_open_context *ctx,
		const struct nfs_lock_context *l_ctx,
		fmode_t fmode)
{
	const struct nfs_lockowner *lockowner = NULL;

	if (l_ctx != NULL)
		lockowner = &l_ctx->lockowner;
4155
	return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4156 4157 4158
}
EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);

4159 4160 4161 4162 4163 4164 4165
static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
		const struct nfs_open_context *ctx,
		const struct nfs_lock_context *l_ctx,
		fmode_t fmode)
{
	nfs4_stateid current_stateid;

4166 4167 4168
	/* If the current stateid represents a lost lock, then exit */
	if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
		return true;
4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186
	return nfs4_stateid_match(stateid, &current_stateid);
}

static bool nfs4_error_stateid_expired(int err)
{
	switch (err) {
	case -NFS4ERR_DELEG_REVOKED:
	case -NFS4ERR_ADMIN_REVOKED:
	case -NFS4ERR_BAD_STATEID:
	case -NFS4ERR_STALE_STATEID:
	case -NFS4ERR_OLD_STATEID:
	case -NFS4ERR_OPENMODE:
	case -NFS4ERR_EXPIRED:
		return true;
	}
	return false;
}

4187
void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4188
{
4189
	nfs_invalidate_atime(hdr->inode);
4190 4191
}

4192
static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
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4193
{
4194
	struct nfs_server *server = NFS_SERVER(hdr->inode);
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4196 4197
	trace_nfs4_read(hdr, task->tk_status);
	if (nfs4_async_handle_error(task, server,
4198 4199
				    hdr->args.context->state,
				    NULL) == -EAGAIN) {
4200
		rpc_restart_call_prepare(task);
4201
		return -EAGAIN;
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4202
	}
4203

4204
	__nfs4_read_done_cb(hdr);
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	if (task->tk_status > 0)
4206
		renew_lease(server, hdr->timestamp);
4207
	return 0;
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}

4210
static bool nfs4_read_stateid_changed(struct rpc_task *task,
4211
		struct nfs_pgio_args *args)
4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223
{

	if (!nfs4_error_stateid_expired(task->tk_status) ||
		nfs4_stateid_is_current(&args->stateid,
				args->context,
				args->lock_context,
				FMODE_READ))
		return false;
	rpc_restart_call_prepare(task);
	return true;
}

4224
static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4225 4226 4227 4228
{

	dprintk("--> %s\n", __func__);

4229
	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4230
		return -EAGAIN;
4231
	if (nfs4_read_stateid_changed(task, &hdr->args))
4232
		return -EAGAIN;
4233 4234
	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
				    nfs4_read_done_cb(task, hdr);
4235 4236
}

4237 4238
static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
				 struct rpc_message *msg)
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4239
{
4240 4241
	hdr->timestamp   = jiffies;
	hdr->pgio_done_cb = nfs4_read_done_cb;
4242
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4243
	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
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}

4246 4247
static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
				      struct nfs_pgio_header *hdr)
4248
{
4249 4250 4251
	if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
			&hdr->args.seq_args,
			&hdr->res.seq_res,
4252
			task))
4253
		return 0;
4254 4255 4256
	if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
				hdr->args.lock_context,
				hdr->rw_ops->rw_mode) == -EIO)
4257
		return -EIO;
4258
	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4259 4260
		return -EIO;
	return 0;
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}

4263 4264
static int nfs4_write_done_cb(struct rpc_task *task,
			      struct nfs_pgio_header *hdr)
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4265
{
4266
	struct inode *inode = hdr->inode;
4267

4268 4269
	trace_nfs4_write(hdr, task->tk_status);
	if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4270 4271
				    hdr->args.context->state,
				    NULL) == -EAGAIN) {
4272
		rpc_restart_call_prepare(task);
4273
		return -EAGAIN;
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4274
	}
4275
	if (task->tk_status >= 0) {
4276
		renew_lease(NFS_SERVER(inode), hdr->timestamp);
4277
		nfs_writeback_update_inode(hdr);
4278
	}
4279
	return 0;
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}

4282
static bool nfs4_write_stateid_changed(struct rpc_task *task,
4283
		struct nfs_pgio_args *args)
4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295
{

	if (!nfs4_error_stateid_expired(task->tk_status) ||
		nfs4_stateid_is_current(&args->stateid,
				args->context,
				args->lock_context,
				FMODE_WRITE))
		return false;
	rpc_restart_call_prepare(task);
	return true;
}

4296
static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4297
{
4298
	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4299
		return -EAGAIN;
4300
	if (nfs4_write_stateid_changed(task, &hdr->args))
4301
		return -EAGAIN;
4302 4303
	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
		nfs4_write_done_cb(task, hdr);
4304 4305
}

4306
static
4307
bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4308
{
4309
	/* Don't request attributes for pNFS or O_DIRECT writes */
4310
	if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4311 4312 4313 4314
		return false;
	/* Otherwise, request attributes if and only if we don't hold
	 * a delegation
	 */
4315
	return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4316 4317
}

4318 4319
static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
				  struct rpc_message *msg)
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{
4321
	struct nfs_server *server = NFS_SERVER(hdr->inode);
4322

4323 4324 4325
	if (!nfs4_write_need_cache_consistency_data(hdr)) {
		hdr->args.bitmask = NULL;
		hdr->res.fattr = NULL;
4326
	} else
4327
		hdr->args.bitmask = server->cache_consistency_bitmask;
4328

4329 4330 4331 4332
	if (!hdr->pgio_done_cb)
		hdr->pgio_done_cb = nfs4_write_done_cb;
	hdr->res.server = server;
	hdr->timestamp   = jiffies;
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4333

4334
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4335
	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
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}

4338
static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4339
{
4340 4341 4342 4343
	nfs4_setup_sequence(NFS_SERVER(data->inode),
			&data->args.seq_args,
			&data->res.seq_res,
			task);
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}

4346
static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
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4347 4348
{
	struct inode *inode = data->inode;
4349

4350
	trace_nfs4_commit(data, task->tk_status);
4351 4352
	if (nfs4_async_handle_error(task, NFS_SERVER(inode),
				    NULL, NULL) == -EAGAIN) {
4353
		rpc_restart_call_prepare(task);
4354
		return -EAGAIN;
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4355
	}
4356
	return 0;
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}

4359
static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4360 4361 4362
{
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return -EAGAIN;
4363
	return data->commit_done_cb(task, data);
4364 4365
}

4366
static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
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4367
{
4368
	struct nfs_server *server = NFS_SERVER(data->inode);
4369

4370 4371
	if (data->commit_done_cb == NULL)
		data->commit_done_cb = nfs4_commit_done_cb;
4372
	data->res.server = server;
4373
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4374
	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
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}

4377 4378 4379 4380 4381
struct nfs4_renewdata {
	struct nfs_client	*client;
	unsigned long		timestamp;
};

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/*
 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
 * standalone procedure for queueing an asynchronous RENEW.
 */
4386
static void nfs4_renew_release(void *calldata)
4387
{
4388 4389
	struct nfs4_renewdata *data = calldata;
	struct nfs_client *clp = data->client;
4390

4391 4392 4393
	if (atomic_read(&clp->cl_count) > 1)
		nfs4_schedule_state_renewal(clp);
	nfs_put_client(clp);
4394
	kfree(data);
4395 4396
}

4397
static void nfs4_renew_done(struct rpc_task *task, void *calldata)
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4398
{
4399 4400 4401
	struct nfs4_renewdata *data = calldata;
	struct nfs_client *clp = data->client;
	unsigned long timestamp = data->timestamp;
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4402

4403
	trace_nfs4_renew_async(clp, task->tk_status);
4404 4405 4406 4407 4408 4409 4410
	switch (task->tk_status) {
	case 0:
		break;
	case -NFS4ERR_LEASE_MOVED:
		nfs4_schedule_lease_moved_recovery(clp);
		break;
	default:
4411
		/* Unless we're shutting down, schedule state recovery! */
4412 4413 4414
		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
			return;
		if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4415
			nfs4_schedule_lease_recovery(clp);
4416 4417 4418
			return;
		}
		nfs4_schedule_path_down_recovery(clp);
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4419
	}
4420
	do_renew_lease(clp, timestamp);
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}

4423 4424
static const struct rpc_call_ops nfs4_renew_ops = {
	.rpc_call_done = nfs4_renew_done,
4425
	.rpc_release = nfs4_renew_release,
4426 4427
};

4428
static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
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{
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
		.rpc_argp	= clp,
4433
		.rpc_cred	= cred,
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4434
	};
4435
	struct nfs4_renewdata *data;
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4436

4437 4438
	if (renew_flags == 0)
		return 0;
4439 4440
	if (!atomic_inc_not_zero(&clp->cl_count))
		return -EIO;
4441
	data = kmalloc(sizeof(*data), GFP_NOFS);
4442 4443 4444 4445
	if (data == NULL)
		return -ENOMEM;
	data->client = clp;
	data->timestamp = jiffies;
4446
	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4447
			&nfs4_renew_ops, data);
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}

4450
static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
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{
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
		.rpc_argp	= clp,
4455
		.rpc_cred	= cred,
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	};
	unsigned long now = jiffies;
	int status;

4460
	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
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	if (status < 0)
		return status;
4463
	do_renew_lease(clp, now);
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4464 4465 4466
	return 0;
}

4467 4468
static inline int nfs4_server_supports_acls(struct nfs_server *server)
{
4469
	return server->caps & NFS_CAP_ACLS;
4470 4471
}

4472 4473
/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4474 4475
 * the stack.
 */
4476
#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4477

4478 4479 4480 4481 4482 4483 4484 4485 4486
static int buf_to_pages_noslab(const void *buf, size_t buflen,
		struct page **pages, unsigned int *pgbase)
{
	struct page *newpage, **spages;
	int rc = 0;
	size_t len;
	spages = pages;

	do {
4487
		len = min_t(size_t, PAGE_SIZE, buflen);
4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506
		newpage = alloc_page(GFP_KERNEL);

		if (newpage == NULL)
			goto unwind;
		memcpy(page_address(newpage), buf, len);
                buf += len;
                buflen -= len;
		*pages++ = newpage;
		rc++;
	} while (buflen != 0);

	return rc;

unwind:
	for(; rc > 0; rc--)
		__free_page(spages[rc-1]);
	return -ENOMEM;
}

4507 4508 4509
struct nfs4_cached_acl {
	int cached;
	size_t len;
4510
	char data[0];
4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552
};

static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	kfree(nfsi->nfs4_acl);
	nfsi->nfs4_acl = acl;
	spin_unlock(&inode->i_lock);
}

static void nfs4_zap_acl_attr(struct inode *inode)
{
	nfs4_set_cached_acl(inode, NULL);
}

static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs4_cached_acl *acl;
	int ret = -ENOENT;

	spin_lock(&inode->i_lock);
	acl = nfsi->nfs4_acl;
	if (acl == NULL)
		goto out;
	if (buf == NULL) /* user is just asking for length */
		goto out_len;
	if (acl->cached == 0)
		goto out;
	ret = -ERANGE; /* see getxattr(2) man page */
	if (acl->len > buflen)
		goto out;
	memcpy(buf, acl->data, acl->len);
out_len:
	ret = acl->len;
out:
	spin_unlock(&inode->i_lock);
	return ret;
}

4553
static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4554 4555
{
	struct nfs4_cached_acl *acl;
4556
	size_t buflen = sizeof(*acl) + acl_len;
4557

4558
	if (buflen <= PAGE_SIZE) {
4559
		acl = kmalloc(buflen, GFP_KERNEL);
4560 4561 4562
		if (acl == NULL)
			goto out;
		acl->cached = 1;
4563
		_copy_from_pages(acl->data, pages, pgbase, acl_len);
4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574
	} else {
		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
		if (acl == NULL)
			goto out;
		acl->cached = 0;
	}
	acl->len = acl_len;
out:
	nfs4_set_cached_acl(inode, acl);
}

4575 4576 4577 4578 4579 4580 4581 4582 4583 4584
/*
 * The getxattr API returns the required buffer length when called with a
 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
 * the required buf.  On a NULL buf, we send a page of data to the server
 * guessing that the ACL request can be serviced by a page. If so, we cache
 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
 * the cache. If not so, we throw away the page, and cache the required
 * length. The next getxattr call will then produce another round trip to
 * the server, this time with the input buf of the required size.
 */
4585
static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4586
{
4587
	struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4588 4589 4590 4591 4592
	struct nfs_getaclargs args = {
		.fh = NFS_FH(inode),
		.acl_pages = pages,
		.acl_len = buflen,
	};
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4593 4594 4595
	struct nfs_getaclres res = {
		.acl_len = buflen,
	};
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
		.rpc_argp = &args,
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4599
		.rpc_resp = &res,
4600
	};
4601 4602
	unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
	int ret = -ENOMEM, i;
4603

4604 4605 4606 4607
	/* As long as we're doing a round trip to the server anyway,
	 * let's be prepared for a page of acl data. */
	if (npages == 0)
		npages = 1;
4608 4609
	if (npages > ARRAY_SIZE(pages))
		return -ERANGE;
4610

4611 4612 4613 4614
	for (i = 0; i < npages; i++) {
		pages[i] = alloc_page(GFP_KERNEL);
		if (!pages[i])
			goto out_free;
4615
	}
4616 4617 4618 4619 4620 4621

	/* for decoding across pages */
	res.acl_scratch = alloc_page(GFP_KERNEL);
	if (!res.acl_scratch)
		goto out_free;

4622 4623
	args.acl_len = npages * PAGE_SIZE;
	args.acl_pgbase = 0;
4624

4625
	dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4626 4627 4628
		__func__, buf, buflen, npages, args.acl_len);
	ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
			     &msg, &args.seq_args, &res.seq_res, 0);
4629 4630
	if (ret)
		goto out_free;
4631

4632 4633 4634 4635 4636
	/* Handle the case where the passed-in buffer is too short */
	if (res.acl_flags & NFS4_ACL_TRUNC) {
		/* Did the user only issue a request for the acl length? */
		if (buf == NULL)
			goto out_ok;
4637
		ret = -ERANGE;
4638
		goto out_free;
4639
	}
4640
	nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4641 4642 4643 4644 4645
	if (buf) {
		if (res.acl_len > buflen) {
			ret = -ERANGE;
			goto out_free;
		}
4646
		_copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4647
	}
4648 4649
out_ok:
	ret = res.acl_len;
4650
out_free:
4651 4652 4653
	for (i = 0; i < npages; i++)
		if (pages[i])
			__free_page(pages[i]);
4654 4655
	if (res.acl_scratch)
		__free_page(res.acl_scratch);
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	return ret;
}

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static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
	struct nfs4_exception exception = { };
	ssize_t ret;
	do {
		ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4665
		trace_nfs4_get_acl(inode, ret);
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		if (ret >= 0)
			break;
		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
	} while (exception.retry);
	return ret;
}

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static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
{
	struct nfs_server *server = NFS_SERVER(inode);
	int ret;

	if (!nfs4_server_supports_acls(server))
		return -EOPNOTSUPP;
	ret = nfs_revalidate_inode(server, inode);
	if (ret < 0)
		return ret;
4683 4684
	if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
		nfs_zap_acl_cache(inode);
4685 4686
	ret = nfs4_read_cached_acl(inode, buf, buflen);
	if (ret != -ENOENT)
4687 4688
		/* -ENOENT is returned if there is no ACL or if there is an ACL
		 * but no cached acl data, just the acl length */
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		return ret;
	return nfs4_get_acl_uncached(inode, buf, buflen);
}

4693
static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4694 4695 4696 4697 4698 4699 4700 4701
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct page *pages[NFS4ACL_MAXPAGES];
	struct nfs_setaclargs arg = {
		.fh		= NFS_FH(inode),
		.acl_pages	= pages,
		.acl_len	= buflen,
	};
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4702
	struct nfs_setaclres res;
4703 4704 4705
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
		.rpc_argp	= &arg,
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4706
		.rpc_resp	= &res,
4707
	};
4708
	unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4709
	int ret, i;
4710 4711 4712

	if (!nfs4_server_supports_acls(server))
		return -EOPNOTSUPP;
4713 4714
	if (npages > ARRAY_SIZE(pages))
		return -ERANGE;
4715 4716 4717
	i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
	if (i < 0)
		return i;
4718
	nfs4_inode_return_delegation(inode);
4719
	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4720 4721 4722 4723 4724 4725 4726 4727

	/*
	 * Free each page after tx, so the only ref left is
	 * held by the network stack
	 */
	for (; i > 0; i--)
		put_page(pages[i-1]);

4728 4729 4730 4731 4732 4733 4734
	/*
	 * Acl update can result in inode attribute update.
	 * so mark the attribute cache invalid.
	 */
	spin_lock(&inode->i_lock);
	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
	spin_unlock(&inode->i_lock);
4735 4736
	nfs_access_zap_cache(inode);
	nfs_zap_acl_cache(inode);
4737 4738 4739
	return ret;
}

4740 4741 4742 4743 4744
static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
{
	struct nfs4_exception exception = { };
	int err;
	do {
4745 4746 4747
		err = __nfs4_proc_set_acl(inode, buf, buflen);
		trace_nfs4_set_acl(inode, err);
		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4748 4749 4750 4751 4752
				&exception);
	} while (exception.retry);
	return err;
}

4753 4754 4755 4756 4757 4758 4759 4760 4761
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
static int _nfs4_get_security_label(struct inode *inode, void *buf,
					size_t buflen)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_fattr fattr;
	struct nfs4_label label = {0, 0, buflen, buf};

	u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4762
	struct nfs4_getattr_arg arg = {
4763 4764 4765 4766 4767 4768 4769 4770 4771 4772
		.fh		= NFS_FH(inode),
		.bitmask	= bitmask,
	};
	struct nfs4_getattr_res res = {
		.fattr		= &fattr,
		.label		= &label,
		.server		= server,
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4773
		.rpc_argp	= &arg,
4774 4775 4776 4777 4778 4779
		.rpc_resp	= &res,
	};
	int ret;

	nfs_fattr_init(&fattr);

4780
	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799
	if (ret)
		return ret;
	if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
		return -ENOENT;
	if (buflen < label.len)
		return -ERANGE;
	return 0;
}

static int nfs4_get_security_label(struct inode *inode, void *buf,
					size_t buflen)
{
	struct nfs4_exception exception = { };
	int err;

	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
		return -EOPNOTSUPP;

	do {
4800 4801 4802
		err = _nfs4_get_security_label(inode, buf, buflen);
		trace_nfs4_get_security_label(inode, err);
		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_do_set_security_label(struct inode *inode,
		struct nfs4_label *ilabel,
		struct nfs_fattr *fattr,
		struct nfs4_label *olabel)
{

	struct iattr sattr = {0};
	struct nfs_server *server = NFS_SERVER(inode);
	const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4817
	struct nfs_setattrargs arg = {
4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830
		.fh             = NFS_FH(inode),
		.iap            = &sattr,
		.server		= server,
		.bitmask	= bitmask,
		.label		= ilabel,
	};
	struct nfs_setattrres res = {
		.fattr		= fattr,
		.label		= olabel,
		.server		= server,
	};
	struct rpc_message msg = {
		.rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4831
		.rpc_argp       = &arg,
4832 4833 4834 4835
		.rpc_resp       = &res,
	};
	int status;

4836
	nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4837

4838
	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853
	if (status)
		dprintk("%s failed: %d\n", __func__, status);

	return status;
}

static int nfs4_do_set_security_label(struct inode *inode,
		struct nfs4_label *ilabel,
		struct nfs_fattr *fattr,
		struct nfs4_label *olabel)
{
	struct nfs4_exception exception = { };
	int err;

	do {
4854 4855 4856 4857
		err = _nfs4_do_set_security_label(inode, ilabel,
				fattr, olabel);
		trace_nfs4_set_security_label(inode, err);
		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868
				&exception);
	} while (exception.retry);
	return err;
}

static int
nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
{
	struct nfs4_label ilabel, *olabel = NULL;
	struct nfs_fattr fattr;
	struct rpc_cred *cred;
4869
	struct inode *inode = d_inode(dentry);
4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903
	int status;

	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
		return -EOPNOTSUPP;

	nfs_fattr_init(&fattr);

	ilabel.pi = 0;
	ilabel.lfs = 0;
	ilabel.label = (char *)buf;
	ilabel.len = buflen;

	cred = rpc_lookup_cred();
	if (IS_ERR(cred))
		return PTR_ERR(cred);

	olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
	if (IS_ERR(olabel)) {
		status = -PTR_ERR(olabel);
		goto out;
	}

	status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
	if (status == 0)
		nfs_setsecurity(inode, &fattr, olabel);

	nfs4_label_free(olabel);
out:
	put_rpccred(cred);
	return status;
}
#endif	/* CONFIG_NFS_V4_SECURITY_LABEL */


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4904
static int
4905 4906
nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
			struct nfs4_state *state, long *timeout)
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4907
{
4908 4909 4910
	struct nfs_client *clp = server->nfs_client;

	if (task->tk_status >= 0)
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4911 4912
		return 0;
	switch(task->tk_status) {
4913
		case -NFS4ERR_DELEG_REVOKED:
4914 4915 4916 4917 4918
		case -NFS4ERR_ADMIN_REVOKED:
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_OPENMODE:
			if (state == NULL)
				break;
4919
			if (nfs4_schedule_stateid_recovery(server, state) < 0)
4920
				goto recovery_failed;
4921
			goto wait_on_recovery;
4922
		case -NFS4ERR_EXPIRED:
4923 4924
			if (state != NULL) {
				if (nfs4_schedule_stateid_recovery(server, state) < 0)
4925
					goto recovery_failed;
4926
			}
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4927
		case -NFS4ERR_STALE_STATEID:
4928
		case -NFS4ERR_STALE_CLIENTID:
4929 4930
			nfs4_schedule_lease_recovery(clp);
			goto wait_on_recovery;
4931 4932 4933 4934
		case -NFS4ERR_MOVED:
			if (nfs4_schedule_migration_recovery(server) < 0)
				goto recovery_failed;
			goto wait_on_recovery;
4935 4936 4937
		case -NFS4ERR_LEASE_MOVED:
			nfs4_schedule_lease_moved_recovery(clp);
			goto wait_on_recovery;
4938 4939 4940 4941 4942 4943 4944 4945 4946 4947
#if defined(CONFIG_NFS_V4_1)
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
			dprintk("%s ERROR %d, Reset session\n", __func__,
				task->tk_status);
4948
			nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4949
			goto wait_on_recovery;
4950
#endif /* CONFIG_NFS_V4_1 */
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4951
		case -NFS4ERR_DELAY:
4952
			nfs_inc_server_stats(server, NFSIOS_DELAY);
4953 4954
			rpc_delay(task, nfs4_update_delay(timeout));
			goto restart_call;
4955
		case -NFS4ERR_GRACE:
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4956
			rpc_delay(task, NFS4_POLL_RETRY_MAX);
4957
		case -NFS4ERR_RETRY_UNCACHED_REP:
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4958
		case -NFS4ERR_OLD_STATEID:
4959
			goto restart_call;
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4960 4961 4962
	}
	task->tk_status = nfs4_map_errors(task->tk_status);
	return 0;
4963
recovery_failed:
4964 4965
	task->tk_status = -EIO;
	return 0;
4966
wait_on_recovery:
4967 4968 4969
	rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
	if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
		rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4970 4971
	if (test_bit(NFS_MIG_FAILED, &server->mig_status))
		goto recovery_failed;
4972
restart_call:
4973 4974
	task->tk_status = 0;
	return -EAGAIN;
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4975 4976
}

4977 4978
static void nfs4_init_boot_verifier(const struct nfs_client *clp,
				    nfs4_verifier *bootverf)
4979 4980 4981
{
	__be32 verf[2];

4982 4983 4984 4985
	if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
		/* An impossible timestamp guarantees this value
		 * will never match a generated boot time. */
		verf[0] = 0;
4986
		verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4987
	} else {
4988
		struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4989 4990
		verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
		verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4991
	}
4992 4993 4994
	memcpy(bootverf->data, verf, sizeof(bootverf->data));
}

4995 4996
static int
nfs4_init_nonuniform_client_string(struct nfs_client *clp)
4997
{
4998 4999 5000 5001
	int result;
	size_t len;
	char *str;
	bool retried = false;
5002

5003
	if (clp->cl_owner_id != NULL)
5004 5005 5006
		return 0;
retry:
	rcu_read_lock();
5007
	len = 14 + strlen(clp->cl_ipaddr) + 1 +
5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024
		strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
		1 +
		strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
		1;
	rcu_read_unlock();

	if (len > NFS4_OPAQUE_LIMIT + 1)
		return -EINVAL;

	/*
	 * Since this string is allocated at mount time, and held until the
	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
	 * about a memory-reclaim deadlock.
	 */
	str = kmalloc(len, GFP_KERNEL);
	if (!str)
		return -ENOMEM;
5025

5026
	rcu_read_lock();
5027 5028 5029 5030
	result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
			clp->cl_ipaddr,
			rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
			rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5031
	rcu_read_unlock();
5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042

	/* Did something change? */
	if (result >= len) {
		kfree(str);
		if (retried)
			return -EINVAL;
		retried = true;
		goto retry;
	}
	clp->cl_owner_id = str;
	return 0;
5043 5044
}

5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081
static int
nfs4_init_uniquifier_client_string(struct nfs_client *clp)
{
	int result;
	size_t len;
	char *str;

	len = 10 + 10 + 1 + 10 + 1 +
		strlen(nfs4_client_id_uniquifier) + 1 +
		strlen(clp->cl_rpcclient->cl_nodename) + 1;

	if (len > NFS4_OPAQUE_LIMIT + 1)
		return -EINVAL;

	/*
	 * Since this string is allocated at mount time, and held until the
	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
	 * about a memory-reclaim deadlock.
	 */
	str = kmalloc(len, GFP_KERNEL);
	if (!str)
		return -ENOMEM;

	result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
			clp->rpc_ops->version, clp->cl_minorversion,
			nfs4_client_id_uniquifier,
			clp->cl_rpcclient->cl_nodename);
	if (result >= len) {
		kfree(str);
		return -EINVAL;
	}
	clp->cl_owner_id = str;
	return 0;
}

static int
nfs4_init_uniform_client_string(struct nfs_client *clp)
5082
{
5083 5084 5085
	int result;
	size_t len;
	char *str;
5086 5087

	if (clp->cl_owner_id != NULL)
5088
		return 0;
5089 5090

	if (nfs4_client_id_uniquifier[0] != '\0')
5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116
		return nfs4_init_uniquifier_client_string(clp);

	len = 10 + 10 + 1 + 10 + 1 +
		strlen(clp->cl_rpcclient->cl_nodename) + 1;

	if (len > NFS4_OPAQUE_LIMIT + 1)
		return -EINVAL;

	/*
	 * Since this string is allocated at mount time, and held until the
	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
	 * about a memory-reclaim deadlock.
	 */
	str = kmalloc(len, GFP_KERNEL);
	if (!str)
		return -ENOMEM;

	result = scnprintf(str, len, "Linux NFSv%u.%u %s",
			clp->rpc_ops->version, clp->cl_minorversion,
			clp->cl_rpcclient->cl_nodename);
	if (result >= len) {
		kfree(str);
		return -EINVAL;
	}
	clp->cl_owner_id = str;
	return 0;
5117 5118
}

5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132
/*
 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
 * services.  Advertise one based on the address family of the
 * clientaddr.
 */
static unsigned int
nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
{
	if (strchr(clp->cl_ipaddr, ':') != NULL)
		return scnprintf(buf, len, "tcp6");
	else
		return scnprintf(buf, len, "tcp");
}

5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144
static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_setclientid *sc = calldata;

	if (task->tk_status == 0)
		sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
}

static const struct rpc_call_ops nfs4_setclientid_ops = {
	.rpc_call_done = nfs4_setclientid_done,
};

5145 5146 5147 5148 5149 5150 5151 5152 5153 5154
/**
 * nfs4_proc_setclientid - Negotiate client ID
 * @clp: state data structure
 * @program: RPC program for NFSv4 callback service
 * @port: IP port number for NFS4 callback service
 * @cred: RPC credential to use for this call
 * @res: where to place the result
 *
 * Returns zero, a negative errno, or a negative NFS4ERR status code.
 */
5155 5156 5157
int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
		unsigned short port, struct rpc_cred *cred,
		struct nfs4_setclientid_res *res)
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{
	nfs4_verifier sc_verifier;
	struct nfs4_setclientid setclientid = {
		.sc_verifier = &sc_verifier,
		.sc_prog = program,
5163
		.sc_clnt = clp,
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	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
		.rpc_argp = &setclientid,
5168
		.rpc_resp = res,
5169
		.rpc_cred = cred,
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	};
5171 5172 5173 5174 5175 5176 5177 5178
	struct rpc_task *task;
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs4_setclientid_ops,
		.callback_data = &setclientid,
		.flags = RPC_TASK_TIMEOUT,
	};
5179
	int status;
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5180

5181
	/* nfs_client_id4 */
5182
	nfs4_init_boot_verifier(clp, &sc_verifier);
5183 5184 5185 5186

	if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
		status = nfs4_init_uniform_client_string(clp);
	else
5187
		status = nfs4_init_nonuniform_client_string(clp);
5188 5189 5190

	if (status)
		goto out;
5191

5192
	/* cb_client4 */
5193 5194 5195 5196
	setclientid.sc_netid_len =
				nfs4_init_callback_netid(clp,
						setclientid.sc_netid,
						sizeof(setclientid.sc_netid));
5197
	setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5198
				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
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5199 5200
				clp->cl_ipaddr, port >> 8, port & 255);

5201
	dprintk("NFS call  setclientid auth=%s, '%s'\n",
5202
		clp->cl_rpcclient->cl_auth->au_ops->au_name,
5203
		clp->cl_owner_id);
5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215
	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task)) {
		status = PTR_ERR(task);
		goto out;
	}
	status = task->tk_status;
	if (setclientid.sc_cred) {
		clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
		put_rpccred(setclientid.sc_cred);
	}
	rpc_put_task(task);
out:
5216
	trace_nfs4_setclientid(clp, status);
5217 5218
	dprintk("NFS reply setclientid: %d\n", status);
	return status;
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}

5221 5222 5223 5224 5225 5226 5227 5228
/**
 * nfs4_proc_setclientid_confirm - Confirm client ID
 * @clp: state data structure
 * @res: result of a previous SETCLIENTID
 * @cred: RPC credential to use for this call
 *
 * Returns zero, a negative errno, or a negative NFS4ERR status code.
 */
5229
int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5230 5231
		struct nfs4_setclientid_res *arg,
		struct rpc_cred *cred)
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{
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5235
		.rpc_argp = arg,
5236
		.rpc_cred = cred,
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	};
	int status;

5240 5241 5242
	dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
		clp->cl_rpcclient->cl_auth->au_ops->au_name,
		clp->cl_clientid);
5243
	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5244
	trace_nfs4_setclientid_confirm(clp, status);
5245
	dprintk("NFS reply setclientid_confirm: %d\n", status);
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	return status;
}

5249 5250
struct nfs4_delegreturndata {
	struct nfs4_delegreturnargs args;
5251
	struct nfs4_delegreturnres res;
5252 5253
	struct nfs_fh fh;
	nfs4_stateid stateid;
5254
	unsigned long timestamp;
5255
	struct nfs_fattr fattr;
5256
	int rpc_status;
5257 5258 5259
	struct inode *inode;
	bool roc;
	u32 roc_barrier;
5260 5261 5262 5263 5264
};

static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_delegreturndata *data = calldata;
5265

5266 5267
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return;
5268

5269
	trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5270 5271
	switch (task->tk_status) {
	case 0:
5272
		renew_lease(data->res.server, data->timestamp);
5273 5274 5275 5276 5277 5278 5279
	case -NFS4ERR_ADMIN_REVOKED:
	case -NFS4ERR_DELEG_REVOKED:
	case -NFS4ERR_BAD_STATEID:
	case -NFS4ERR_OLD_STATEID:
	case -NFS4ERR_STALE_STATEID:
	case -NFS4ERR_EXPIRED:
		task->tk_status = 0;
5280 5281
		if (data->roc)
			pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5282
		break;
5283
	default:
5284 5285
		if (nfs4_async_handle_error(task, data->res.server,
					    NULL, NULL) == -EAGAIN) {
5286
			rpc_restart_call_prepare(task);
5287 5288 5289 5290
			return;
		}
	}
	data->rpc_status = task->tk_status;
5291 5292 5293 5294
}

static void nfs4_delegreturn_release(void *calldata)
{
5295
	struct nfs4_delegreturndata *data = calldata;
5296
	struct inode *inode = data->inode;
5297

5298 5299 5300 5301 5302
	if (inode) {
		if (data->roc)
			pnfs_roc_release(inode);
		nfs_iput_and_deactive(inode);
	}
5303 5304 5305
	kfree(calldata);
}

5306 5307 5308 5309 5310 5311
static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
{
	struct nfs4_delegreturndata *d_data;

	d_data = (struct nfs4_delegreturndata *)data;

5312 5313 5314 5315
	if (d_data->roc &&
	    pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
		return;

5316 5317 5318 5319
	nfs4_setup_sequence(d_data->res.server,
			&d_data->args.seq_args,
			&d_data->res.seq_res,
			task);
5320 5321
}

5322
static const struct rpc_call_ops nfs4_delegreturn_ops = {
5323
	.rpc_call_prepare = nfs4_delegreturn_prepare,
5324 5325 5326 5327
	.rpc_call_done = nfs4_delegreturn_done,
	.rpc_release = nfs4_delegreturn_release,
};

5328
static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5329 5330
{
	struct nfs4_delegreturndata *data;
5331
	struct nfs_server *server = NFS_SERVER(inode);
5332
	struct rpc_task *task;
5333 5334 5335 5336
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
		.rpc_cred = cred,
	};
5337 5338
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
5339
		.rpc_message = &msg,
5340 5341 5342
		.callback_ops = &nfs4_delegreturn_ops,
		.flags = RPC_TASK_ASYNC,
	};
5343
	int status = 0;
5344

5345
	data = kzalloc(sizeof(*data), GFP_NOFS);
5346 5347
	if (data == NULL)
		return -ENOMEM;
5348
	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5349 5350
	data->args.fhandle = &data->fh;
	data->args.stateid = &data->stateid;
5351
	data->args.bitmask = server->cache_consistency_bitmask;
5352
	nfs_copy_fh(&data->fh, NFS_FH(inode));
5353
	nfs4_stateid_copy(&data->stateid, stateid);
5354 5355
	data->res.fattr = &data->fattr;
	data->res.server = server;
5356
	nfs_fattr_init(data->res.fattr);
5357
	data->timestamp = jiffies;
5358
	data->rpc_status = 0;
5359 5360 5361
	data->inode = nfs_igrab_and_active(inode);
	if (data->inode)
		data->roc = nfs4_roc(inode);
5362

5363
	task_setup_data.callback_data = data;
5364 5365
	msg.rpc_argp = &data->args;
	msg.rpc_resp = &data->res;
5366
	task = rpc_run_task(&task_setup_data);
5367
	if (IS_ERR(task))
5368
		return PTR_ERR(task);
5369 5370
	if (!issync)
		goto out;
5371
	status = nfs4_wait_for_completion_rpc_task(task);
5372 5373 5374
	if (status != 0)
		goto out;
	status = data->rpc_status;
5375 5376 5377 5378
	if (status == 0)
		nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
	else
		nfs_refresh_inode(inode, &data->fattr);
5379
out:
5380
	rpc_put_task(task);
5381
	return status;
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}

5384
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
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{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs4_exception exception = { };
	int err;
	do {
5390
		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5391
		trace_nfs4_delegreturn(inode, err);
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		switch (err) {
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_EXPIRED:
			case 0:
				return 0;
		}
		err = nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
}

#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)

/* 
 * sleep, with exponential backoff, and retry the LOCK operation. 
 */
static unsigned long
nfs4_set_lock_task_retry(unsigned long timeout)
{
5412
	freezable_schedule_timeout_killable_unsafe(timeout);
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	timeout <<= 1;
	if (timeout > NFS4_LOCK_MAXTIMEOUT)
		return NFS4_LOCK_MAXTIMEOUT;
	return timeout;
}

static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	struct inode *inode = state->inode;
	struct nfs_server *server = NFS_SERVER(inode);
5423
	struct nfs_client *clp = server->nfs_client;
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5424
	struct nfs_lockt_args arg = {
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5425
		.fh = NFS_FH(inode),
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5426
		.fl = request,
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5427
	};
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5428 5429
	struct nfs_lockt_res res = {
		.denied = request,
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	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
		.rpc_argp       = &arg,
		.rpc_resp       = &res,
		.rpc_cred	= state->owner->so_cred,
	};
	struct nfs4_lock_state *lsp;
	int status;

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5440
	arg.lock_owner.clientid = clp->cl_clientid;
5441 5442 5443 5444
	status = nfs4_set_lock_state(state, request);
	if (status != 0)
		goto out;
	lsp = request->fl_u.nfs4_fl.owner;
5445
	arg.lock_owner.id = lsp->ls_seqid.owner_id;
5446
	arg.lock_owner.s_dev = server->s_dev;
5447
	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
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5448 5449 5450 5451 5452 5453
	switch (status) {
		case 0:
			request->fl_type = F_UNLCK;
			break;
		case -NFS4ERR_DENIED:
			status = 0;
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5454
	}
5455
	request->fl_ops->fl_release_private(request);
5456
	request->fl_ops = NULL;
5457
out:
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5458 5459 5460 5461 5462 5463 5464 5465 5466
	return status;
}

static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	struct nfs4_exception exception = { };
	int err;

	do {
5467 5468 5469
		err = _nfs4_proc_getlk(state, cmd, request);
		trace_nfs4_get_lock(request, state, cmd, err);
		err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
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5470 5471 5472 5473 5474
				&exception);
	} while (exception.retry);
	return err;
}

5475
static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
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5476 5477 5478 5479
{
	int res = 0;
	switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
		case FL_POSIX:
5480
			res = posix_lock_inode_wait(inode, fl);
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5481 5482
			break;
		case FL_FLOCK:
5483
			res = flock_lock_inode_wait(inode, fl);
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5484 5485 5486 5487 5488 5489 5490
			break;
		default:
			BUG();
	}
	return res;
}

5491
struct nfs4_unlockdata {
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5492 5493
	struct nfs_locku_args arg;
	struct nfs_locku_res res;
5494 5495
	struct nfs4_lock_state *lsp;
	struct nfs_open_context *ctx;
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5496 5497
	struct file_lock fl;
	const struct nfs_server *server;
5498
	unsigned long timestamp;
5499 5500
};

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static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
		struct nfs_open_context *ctx,
		struct nfs4_lock_state *lsp,
		struct nfs_seqid *seqid)
{
	struct nfs4_unlockdata *p;
	struct inode *inode = lsp->ls_state->inode;

5509
	p = kzalloc(sizeof(*p), GFP_NOFS);
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	if (p == NULL)
		return NULL;
	p->arg.fh = NFS_FH(inode);
	p->arg.fl = &p->fl;
	p->arg.seqid = seqid;
5515
	p->res.seqid = seqid;
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	p->lsp = lsp;
	atomic_inc(&lsp->ls_count);
	/* Ensure we don't close file until we're done freeing locks! */
	p->ctx = get_nfs_open_context(ctx);
	memcpy(&p->fl, fl, sizeof(p->fl));
	p->server = NFS_SERVER(inode);
	return p;
}

5525
static void nfs4_locku_release_calldata(void *data)
5526
{
5527
	struct nfs4_unlockdata *calldata = data;
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5528
	nfs_free_seqid(calldata->arg.seqid);
5529 5530 5531
	nfs4_put_lock_state(calldata->lsp);
	put_nfs_open_context(calldata->ctx);
	kfree(calldata);
5532 5533
}

5534
static void nfs4_locku_done(struct rpc_task *task, void *data)
5535
{
5536
	struct nfs4_unlockdata *calldata = data;
5537

5538 5539
	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
		return;
5540 5541
	switch (task->tk_status) {
		case 0:
5542
			renew_lease(calldata->server, calldata->timestamp);
5543
			do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5544 5545 5546
			if (nfs4_update_lock_stateid(calldata->lsp,
					&calldata->res.stateid))
				break;
5547 5548
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_OLD_STATEID:
5549 5550
		case -NFS4ERR_STALE_STATEID:
		case -NFS4ERR_EXPIRED:
5551 5552 5553
			if (!nfs4_stateid_match(&calldata->arg.stateid,
						&calldata->lsp->ls_stateid))
				rpc_restart_call_prepare(task);
5554 5555
			break;
		default:
5556 5557
			if (nfs4_async_handle_error(task, calldata->server,
						    NULL, NULL) == -EAGAIN)
5558
				rpc_restart_call_prepare(task);
5559
	}
5560
	nfs_release_seqid(calldata->arg.seqid);
5561 5562
}

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5563
static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5564
{
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5565
	struct nfs4_unlockdata *calldata = data;
5566

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5567
	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5568
		goto out_wait;
5569
	nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5570
	if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5571
		/* Note: exit _without_ running nfs4_locku_done */
5572
		goto out_no_action;
5573
	}
5574
	calldata->timestamp = jiffies;
5575
	if (nfs4_setup_sequence(calldata->server,
5576
				&calldata->arg.seq_args,
5577 5578 5579
				&calldata->res.seq_res,
				task) != 0)
		nfs_release_seqid(calldata->arg.seqid);
5580 5581 5582 5583 5584
	return;
out_no_action:
	task->tk_action = NULL;
out_wait:
	nfs4_sequence_done(task, &calldata->res.seq_res);
5585 5586
}

5587
static const struct rpc_call_ops nfs4_locku_ops = {
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5588
	.rpc_call_prepare = nfs4_locku_prepare,
5589
	.rpc_call_done = nfs4_locku_done,
5590
	.rpc_release = nfs4_locku_release_calldata,
5591 5592
};

5593 5594 5595 5596 5597 5598
static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
		struct nfs_open_context *ctx,
		struct nfs4_lock_state *lsp,
		struct nfs_seqid *seqid)
{
	struct nfs4_unlockdata *data;
5599 5600 5601 5602
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
		.rpc_cred = ctx->cred,
	};
5603 5604
	struct rpc_task_setup task_setup_data = {
		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5605
		.rpc_message = &msg,
5606
		.callback_ops = &nfs4_locku_ops,
5607
		.workqueue = nfsiod_workqueue,
5608 5609
		.flags = RPC_TASK_ASYNC,
	};
5610

5611 5612 5613
	nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
		NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);

5614 5615 5616 5617 5618
	/* Ensure this is an unlock - when canceling a lock, the
	 * canceled lock is passed in, and it won't be an unlock.
	 */
	fl->fl_type = F_UNLCK;

5619 5620 5621 5622 5623 5624
	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
	if (data == NULL) {
		nfs_free_seqid(seqid);
		return ERR_PTR(-ENOMEM);
	}

5625
	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5626 5627
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;
5628 5629
	task_setup_data.callback_data = data;
	return rpc_run_task(&task_setup_data);
5630 5631
}

5632 5633
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
5634 5635 5636
	struct inode *inode = state->inode;
	struct nfs4_state_owner *sp = state->owner;
	struct nfs_inode *nfsi = NFS_I(inode);
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5637
	struct nfs_seqid *seqid;
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Linus Torvalds committed
5638
	struct nfs4_lock_state *lsp;
5639
	struct rpc_task *task;
5640
	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5641
	int status = 0;
5642
	unsigned char fl_flags = request->fl_flags;
5643

5644
	status = nfs4_set_lock_state(state, request);
5645 5646
	/* Unlock _before_ we do the RPC call */
	request->fl_flags |= FL_EXISTS;
5647 5648 5649
	/* Exclude nfs_delegation_claim_locks() */
	mutex_lock(&sp->so_delegreturn_mutex);
	/* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5650
	down_read(&nfsi->rwsem);
5651
	if (do_vfs_lock(inode, request) == -ENOENT) {
5652
		up_read(&nfsi->rwsem);
5653
		mutex_unlock(&sp->so_delegreturn_mutex);
5654
		goto out;
5655 5656
	}
	up_read(&nfsi->rwsem);
5657
	mutex_unlock(&sp->so_delegreturn_mutex);
5658
	if (status != 0)
5659 5660
		goto out;
	/* Is this a delegated lock? */
5661
	lsp = request->fl_u.nfs4_fl.owner;
5662 5663
	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
		goto out;
5664 5665
	alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
	seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5666
	status = -ENOMEM;
5667
	if (IS_ERR(seqid))
5668
		goto out;
5669
	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5670 5671
	status = PTR_ERR(task);
	if (IS_ERR(task))
5672
		goto out;
5673
	status = nfs4_wait_for_completion_rpc_task(task);
5674
	rpc_put_task(task);
5675
out:
5676
	request->fl_flags = fl_flags;
5677
	trace_nfs4_unlock(request, state, F_SETLK, status);
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5678 5679 5680
	return status;
}

5681 5682 5683 5684 5685 5686
struct nfs4_lockdata {
	struct nfs_lock_args arg;
	struct nfs_lock_res res;
	struct nfs4_lock_state *lsp;
	struct nfs_open_context *ctx;
	struct file_lock fl;
5687
	unsigned long timestamp;
5688 5689
	int rpc_status;
	int cancelled;
5690
	struct nfs_server *server;
5691 5692 5693
};

static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5694 5695
		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
		gfp_t gfp_mask)
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5696
{
5697 5698
	struct nfs4_lockdata *p;
	struct inode *inode = lsp->ls_state->inode;
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5699
	struct nfs_server *server = NFS_SERVER(inode);
5700
	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5701

5702
	p = kzalloc(sizeof(*p), gfp_mask);
5703 5704 5705 5706 5707
	if (p == NULL)
		return NULL;

	p->arg.fh = NFS_FH(inode);
	p->arg.fl = &p->fl;
5708
	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5709
	if (IS_ERR(p->arg.open_seqid))
5710
		goto out_free;
5711 5712
	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
	p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5713
	if (IS_ERR(p->arg.lock_seqid))
5714
		goto out_free_seqid;
5715
	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5716
	p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5717
	p->arg.lock_owner.s_dev = server->s_dev;
5718
	p->res.lock_seqid = p->arg.lock_seqid;
5719
	p->lsp = lsp;
5720
	p->server = server;
5721 5722
	atomic_inc(&lsp->ls_count);
	p->ctx = get_nfs_open_context(ctx);
5723
	get_file(fl->fl_file);
5724 5725
	memcpy(&p->fl, fl, sizeof(p->fl));
	return p;
5726 5727
out_free_seqid:
	nfs_free_seqid(p->arg.open_seqid);
5728 5729 5730 5731 5732 5733 5734 5735 5736
out_free:
	kfree(p);
	return NULL;
}

static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_lockdata *data = calldata;
	struct nfs4_state *state = data->lsp->ls_state;
5737

5738
	dprintk("%s: begin!\n", __func__);
5739
	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5740
		goto out_wait;
5741
	/* Do we need to do an open_to_lock_owner? */
5742
	if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5743
		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5744
			goto out_release_lock_seqid;
5745
		}
5746 5747
		nfs4_stateid_copy(&data->arg.open_stateid,
				&state->open_stateid);
5748
		data->arg.new_lock_owner = 1;
5749
		data->res.open_seqid = data->arg.open_seqid;
5750
	} else {
5751
		data->arg.new_lock_owner = 0;
5752 5753 5754
		nfs4_stateid_copy(&data->arg.lock_stateid,
				&data->lsp->ls_stateid);
	}
5755 5756 5757 5758 5759
	if (!nfs4_valid_open_stateid(state)) {
		data->rpc_status = -EBADF;
		task->tk_action = NULL;
		goto out_release_open_seqid;
	}
5760
	data->timestamp = jiffies;
5761 5762
	if (nfs4_setup_sequence(data->server,
				&data->arg.seq_args,
5763
				&data->res.seq_res,
5764
				task) == 0)
5765
		return;
5766
out_release_open_seqid:
5767 5768 5769
	nfs_release_seqid(data->arg.open_seqid);
out_release_lock_seqid:
	nfs_release_seqid(data->arg.lock_seqid);
5770 5771
out_wait:
	nfs4_sequence_done(task, &data->res.seq_res);
5772
	dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5773 5774
}

5775 5776 5777
static void nfs4_lock_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_lockdata *data = calldata;
5778
	struct nfs4_lock_state *lsp = data->lsp;
5779

5780
	dprintk("%s: begin!\n", __func__);
5781

5782 5783
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return;
5784

5785
	data->rpc_status = task->tk_status;
5786 5787
	switch (task->tk_status) {
	case 0:
5788
		renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5789
				data->timestamp);
5790 5791
		if (data->arg.new_lock) {
			data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5792
			if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5793 5794 5795 5796
				rpc_restart_call_prepare(task);
				break;
			}
		}
5797 5798 5799 5800 5801 5802
		if (data->arg.new_lock_owner != 0) {
			nfs_confirm_seqid(&lsp->ls_seqid, 0);
			nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
			set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
		} else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
			rpc_restart_call_prepare(task);
5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814
		break;
	case -NFS4ERR_BAD_STATEID:
	case -NFS4ERR_OLD_STATEID:
	case -NFS4ERR_STALE_STATEID:
	case -NFS4ERR_EXPIRED:
		if (data->arg.new_lock_owner != 0) {
			if (!nfs4_stateid_match(&data->arg.open_stateid,
						&lsp->ls_state->open_stateid))
				rpc_restart_call_prepare(task);
		} else if (!nfs4_stateid_match(&data->arg.lock_stateid,
						&lsp->ls_stateid))
				rpc_restart_call_prepare(task);
5815
	}
5816
	dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5817 5818 5819 5820 5821 5822
}

static void nfs4_lock_release(void *calldata)
{
	struct nfs4_lockdata *data = calldata;

5823
	dprintk("%s: begin!\n", __func__);
5824
	nfs_free_seqid(data->arg.open_seqid);
5825 5826 5827 5828 5829
	if (data->cancelled != 0) {
		struct rpc_task *task;
		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
				data->arg.lock_seqid);
		if (!IS_ERR(task))
5830
			rpc_put_task_async(task);
5831
		dprintk("%s: cancelling lock!\n", __func__);
5832 5833 5834 5835
	} else
		nfs_free_seqid(data->arg.lock_seqid);
	nfs4_put_lock_state(data->lsp);
	put_nfs_open_context(data->ctx);
5836
	fput(data->fl.fl_file);
5837
	kfree(data);
5838
	dprintk("%s: done!\n", __func__);
5839 5840 5841 5842 5843 5844 5845 5846
}

static const struct rpc_call_ops nfs4_lock_ops = {
	.rpc_call_prepare = nfs4_lock_prepare,
	.rpc_call_done = nfs4_lock_done,
	.rpc_release = nfs4_lock_release,
};

5847 5848 5849 5850 5851
static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
{
	switch (error) {
	case -NFS4ERR_ADMIN_REVOKED:
	case -NFS4ERR_BAD_STATEID:
5852
		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5853
		if (new_lock_owner != 0 ||
5854
		   test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5855
			nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5856 5857 5858
		break;
	case -NFS4ERR_STALE_STATEID:
		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5859 5860
	case -NFS4ERR_EXPIRED:
		nfs4_schedule_lease_recovery(server->nfs_client);
5861 5862 5863
	};
}

5864
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5865 5866 5867
{
	struct nfs4_lockdata *data;
	struct rpc_task *task;
5868 5869 5870 5871
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
		.rpc_cred = state->owner->so_cred,
	};
5872 5873
	struct rpc_task_setup task_setup_data = {
		.rpc_client = NFS_CLIENT(state->inode),
5874
		.rpc_message = &msg,
5875
		.callback_ops = &nfs4_lock_ops,
5876
		.workqueue = nfsiod_workqueue,
5877 5878
		.flags = RPC_TASK_ASYNC,
	};
5879 5880
	int ret;

5881
	dprintk("%s: begin!\n", __func__);
5882
	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5883 5884
			fl->fl_u.nfs4_fl.owner,
			recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5885 5886 5887 5888
	if (data == NULL)
		return -ENOMEM;
	if (IS_SETLKW(cmd))
		data->arg.block = 1;
5889
	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5890 5891
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;
5892
	task_setup_data.callback_data = data;
5893 5894 5895 5896
	if (recovery_type > NFS_LOCK_NEW) {
		if (recovery_type == NFS_LOCK_RECLAIM)
			data->arg.reclaim = NFS_LOCK_RECLAIM;
		nfs4_set_sequence_privileged(&data->arg.seq_args);
5897 5898
	} else
		data->arg.new_lock = 1;
5899
	task = rpc_run_task(&task_setup_data);
5900
	if (IS_ERR(task))
5901 5902 5903 5904
		return PTR_ERR(task);
	ret = nfs4_wait_for_completion_rpc_task(task);
	if (ret == 0) {
		ret = data->rpc_status;
5905 5906 5907
		if (ret)
			nfs4_handle_setlk_error(data->server, data->lsp,
					data->arg.new_lock_owner, ret);
5908 5909
	} else
		data->cancelled = 1;
5910
	rpc_put_task(task);
5911
	dprintk("%s: done, ret = %d!\n", __func__, ret);
5912
	return ret;
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5913 5914 5915 5916
}

static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
{
5917
	struct nfs_server *server = NFS_SERVER(state->inode);
5918 5919 5920
	struct nfs4_exception exception = {
		.inode = state->inode,
	};
5921 5922 5923
	int err;

	do {
5924 5925 5926
		/* Cache the lock if possible... */
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
			return 0;
5927
		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5928
		trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5929
		if (err != -NFS4ERR_DELAY)
5930 5931 5932 5933
			break;
		nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
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Linus Torvalds committed
5934 5935 5936 5937
}

static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
5938
	struct nfs_server *server = NFS_SERVER(state->inode);
5939 5940 5941
	struct nfs4_exception exception = {
		.inode = state->inode,
	};
5942 5943
	int err;

5944 5945 5946
	err = nfs4_set_lock_state(state, request);
	if (err != 0)
		return err;
5947
	if (!recover_lost_locks) {
5948 5949 5950
		set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
		return 0;
	}
5951
	do {
5952 5953
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
			return 0;
5954
		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5955
		trace_nfs4_lock_expired(request, state, F_SETLK, err);
5956 5957 5958 5959 5960 5961 5962 5963
		switch (err) {
		default:
			goto out;
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			nfs4_handle_exception(server, err, &exception);
			err = 0;
		}
5964
	} while (exception.retry);
5965
out:
5966
	return err;
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Linus Torvalds committed
5967 5968
}

5969
#if defined(CONFIG_NFS_V4_1)
5970 5971 5972 5973 5974 5975 5976 5977
/**
 * nfs41_check_expired_locks - possibly free a lock stateid
 *
 * @state: NFSv4 state for an inode
 *
 * Returns NFS_OK if recovery for this stateid is now finished.
 * Otherwise a negative NFS4ERR value is returned.
 */
5978
static int nfs41_check_expired_locks(struct nfs4_state *state)
5979
{
5980
	int status, ret = -NFS4ERR_BAD_STATEID;
5981
	struct nfs4_lock_state *lsp;
5982 5983
	struct nfs_server *server = NFS_SERVER(state->inode);

5984
	list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5985
		if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5986 5987 5988 5989 5990
			struct rpc_cred *cred = lsp->ls_state->owner->so_cred;

			status = nfs41_test_stateid(server,
					&lsp->ls_stateid,
					cred);
5991
			trace_nfs4_test_lock_stateid(state, lsp, status);
5992
			if (status != NFS_OK) {
5993 5994
				/* Free the stateid unless the server
				 * informs us the stateid is unrecognized. */
5995 5996
				if (status != -NFS4ERR_BAD_STATEID)
					nfs41_free_stateid(server,
5997 5998
							&lsp->ls_stateid,
							cred);
5999
				clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013
				ret = status;
			}
		}
	};

	return ret;
}

static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
	int status = NFS_OK;

	if (test_bit(LK_STATE_IN_USE, &state->flags))
		status = nfs41_check_expired_locks(state);
6014 6015 6016
	if (status != NFS_OK)
		status = nfs4_lock_expired(state, request);
	return status;
6017 6018 6019
}
#endif

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6020 6021
static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
6022
	struct nfs_inode *nfsi = NFS_I(state->inode);
6023
	unsigned char fl_flags = request->fl_flags;
6024
	int status = -ENOLCK;
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Linus Torvalds committed
6025

6026 6027 6028
	if ((fl_flags & FL_POSIX) &&
			!test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
		goto out;
6029 6030 6031 6032
	/* Is this a delegated open? */
	status = nfs4_set_lock_state(state, request);
	if (status != 0)
		goto out;
6033
	request->fl_flags |= FL_ACCESS;
6034
	status = do_vfs_lock(state->inode, request);
6035 6036
	if (status < 0)
		goto out;
6037
	down_read(&nfsi->rwsem);
6038 6039 6040
	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
		/* Yes: cache locks! */
		/* ...but avoid races with delegation recall... */
6041
		request->fl_flags = fl_flags & ~FL_SLEEP;
6042
		status = do_vfs_lock(state->inode, request);
6043
		up_read(&nfsi->rwsem);
6044 6045
		goto out;
	}
6046
	up_read(&nfsi->rwsem);
6047
	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6048 6049
out:
	request->fl_flags = fl_flags;
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6050 6051 6052 6053 6054
	return status;
}

static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
6055 6056
	struct nfs4_exception exception = {
		.state = state,
6057
		.inode = state->inode,
6058
	};
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	int err;

	do {
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		err = _nfs4_proc_setlk(state, cmd, request);
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		trace_nfs4_set_lock(request, state, cmd, err);
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		if (err == -NFS4ERR_DENIED)
			err = -EAGAIN;
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		err = nfs4_handle_exception(NFS_SERVER(state->inode),
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				err, &exception);
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	} while (exception.retry);
	return err;
}

static int
nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
{
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
	unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
	int status;

	/* verify open state */
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	ctx = nfs_file_open_context(filp);
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	state = ctx->state;

	if (request->fl_start < 0 || request->fl_end < 0)
		return -EINVAL;

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	if (IS_GETLK(cmd)) {
		if (state != NULL)
			return nfs4_proc_getlk(state, F_GETLK, request);
		return 0;
	}
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	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
		return -EINVAL;

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	if (request->fl_type == F_UNLCK) {
		if (state != NULL)
			return nfs4_proc_unlck(state, cmd, request);
		return 0;
	}
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	if (state == NULL)
		return -ENOLCK;
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	/*
	 * Don't rely on the VFS having checked the file open mode,
	 * since it won't do this for flock() locks.
	 */
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	switch (request->fl_type) {
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	case F_RDLCK:
		if (!(filp->f_mode & FMODE_READ))
			return -EBADF;
		break;
	case F_WRLCK:
		if (!(filp->f_mode & FMODE_WRITE))
			return -EBADF;
	}

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	do {
		status = nfs4_proc_setlk(state, cmd, request);
		if ((status != -EAGAIN) || IS_SETLK(cmd))
			break;
		timeout = nfs4_set_lock_task_retry(timeout);
		status = -ERESTARTSYS;
		if (signalled())
			break;
	} while(status < 0);
	return status;
}

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int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
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{
	struct nfs_server *server = NFS_SERVER(state->inode);
	int err;

	err = nfs4_set_lock_state(state, fl);
	if (err != 0)
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		return err;
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	err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
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	return nfs4_handle_delegation_recall_error(server, state, stateid, err);
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}
6141

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struct nfs_release_lockowner_data {
	struct nfs4_lock_state *lsp;
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	struct nfs_server *server;
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	struct nfs_release_lockowner_args args;
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	struct nfs_release_lockowner_res res;
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	unsigned long timestamp;
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};

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static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs_release_lockowner_data *data = calldata;
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	struct nfs_server *server = data->server;
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	nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
			     &data->args.seq_args, &data->res.seq_res, task);
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	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6157
	data->timestamp = jiffies;
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}

static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
{
	struct nfs_release_lockowner_data *data = calldata;
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	struct nfs_server *server = data->server;

6165
	nfs40_sequence_done(task, &data->res.seq_res);
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	switch (task->tk_status) {
	case 0:
		renew_lease(server, data->timestamp);
		break;
	case -NFS4ERR_STALE_CLIENTID:
	case -NFS4ERR_EXPIRED:
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		nfs4_schedule_lease_recovery(server->nfs_client);
		break;
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	case -NFS4ERR_LEASE_MOVED:
	case -NFS4ERR_DELAY:
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		if (nfs4_async_handle_error(task, server,
					    NULL, NULL) == -EAGAIN)
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			rpc_restart_call_prepare(task);
	}
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}

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static void nfs4_release_lockowner_release(void *calldata)
{
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	struct nfs_release_lockowner_data *data = calldata;
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	nfs4_free_lock_state(data->server, data->lsp);
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	kfree(calldata);
}

6190
static const struct rpc_call_ops nfs4_release_lockowner_ops = {
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	.rpc_call_prepare = nfs4_release_lockowner_prepare,
	.rpc_call_done = nfs4_release_lockowner_done,
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	.rpc_release = nfs4_release_lockowner_release,
};

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static void
nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
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{
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	struct nfs_release_lockowner_data *data;
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
	};

	if (server->nfs_client->cl_mvops->minor_version != 0)
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		return;
6206

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	data = kmalloc(sizeof(*data), GFP_NOFS);
	if (!data)
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		return;
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	data->lsp = lsp;
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	data->server = server;
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	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
	data->args.lock_owner.id = lsp->ls_seqid.owner_id;
	data->args.lock_owner.s_dev = server->s_dev;
6215

6216
	msg.rpc_argp = &data->args;
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	msg.rpc_resp = &data->res;
	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
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	rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
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}

6222 6223
#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"

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static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
				   const void *buf, size_t buflen,
				   int flags, int type)
6227
{
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	if (strcmp(key, "") != 0)
		return -EINVAL;
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	return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
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}

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static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
				   void *buf, size_t buflen, int type)
6236
{
6237 6238
	if (strcmp(key, "") != 0)
		return -EINVAL;
6239

6240
	return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
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}

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static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
				       size_t list_len, const char *name,
				       size_t name_len, int type)
6246
{
6247
	size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6248

6249
	if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
6250
		return 0;
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	if (list && len <= list_len)
		memcpy(list, XATTR_NAME_NFSV4_ACL, len);
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	return len;
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}

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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
static inline int nfs4_server_supports_labels(struct nfs_server *server)
{
	return server->caps & NFS_CAP_SECURITY_LABEL;
}

static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
				   const void *buf, size_t buflen,
				   int flags, int type)
{
	if (security_ismaclabel(key))
		return nfs4_set_security_label(dentry, buf, buflen);

	return -EOPNOTSUPP;
}

static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
				   void *buf, size_t buflen, int type)
{
	if (security_ismaclabel(key))
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		return nfs4_get_security_label(d_inode(dentry), buf, buflen);
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	return -EOPNOTSUPP;
}

static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
				       size_t list_len, const char *name,
				       size_t name_len, int type)
{
	size_t len = 0;

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	if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
		len = security_inode_listsecurity(d_inode(dentry), NULL, 0);
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		if (list && len <= list_len)
6290
			security_inode_listsecurity(d_inode(dentry), list, len);
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	}
	return len;
}

static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
	.prefix = XATTR_SECURITY_PREFIX,
	.list	= nfs4_xattr_list_nfs4_label,
	.get	= nfs4_xattr_get_nfs4_label,
	.set	= nfs4_xattr_set_nfs4_label,
};
#endif


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/*
 * nfs_fhget will use either the mounted_on_fileid or the fileid
 */
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static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
{
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	if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
	       (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
	      (fattr->valid & NFS_ATTR_FATTR_FSID) &&
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	      (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
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		return;

	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
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		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
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	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	fattr->nlink = 2;
}

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static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
				   const struct qstr *name,
				   struct nfs4_fs_locations *fs_locations,
				   struct page *page)
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{
	struct nfs_server *server = NFS_SERVER(dir);
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	u32 bitmask[3] = {
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		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
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	};
	struct nfs4_fs_locations_arg args = {
		.dir_fh = NFS_FH(dir),
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		.name = name,
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		.page = page,
		.bitmask = bitmask,
	};
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	struct nfs4_fs_locations_res res = {
		.fs_locations = fs_locations,
	};
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
		.rpc_argp = &args,
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		.rpc_resp = &res,
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	};
	int status;

6346
	dprintk("%s: start\n", __func__);
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	/* Ask for the fileid of the absent filesystem if mounted_on_fileid
	 * is not supported */
	if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
		bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
	else
		bitmask[0] |= FATTR4_WORD0_FILEID;

6355
	nfs_fattr_init(&fs_locations->fattr);
6356
	fs_locations->server = server;
6357
	fs_locations->nlocations = 0;
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	status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6359
	dprintk("%s: returned status = %d\n", __func__, status);
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	return status;
}

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int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
			   const struct qstr *name,
			   struct nfs4_fs_locations *fs_locations,
			   struct page *page)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
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		err = _nfs4_proc_fs_locations(client, dir, name,
				fs_locations, page);
		trace_nfs4_get_fs_locations(dir, name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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				&exception);
	} while (exception.retry);
	return err;
}

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/*
 * This operation also signals the server that this client is
 * performing migration recovery.  The server can stop returning
 * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
 * appended to this compound to identify the client ID which is
 * performing recovery.
 */
static int _nfs40_proc_get_locations(struct inode *inode,
				     struct nfs4_fs_locations *locations,
				     struct page *page, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct rpc_clnt *clnt = server->client;
	u32 bitmask[2] = {
		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
	};
	struct nfs4_fs_locations_arg args = {
		.clientid	= server->nfs_client->cl_clientid,
		.fh		= NFS_FH(inode),
		.page		= page,
		.bitmask	= bitmask,
		.migration	= 1,		/* skip LOOKUP */
		.renew		= 1,		/* append RENEW */
	};
	struct nfs4_fs_locations_res res = {
		.fs_locations	= locations,
		.migration	= 1,
		.renew		= 1,
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
		.rpc_argp	= &args,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
	};
	unsigned long now = jiffies;
	int status;

	nfs_fattr_init(&locations->fattr);
	locations->server = server;
	locations->nlocations = 0;

	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
	nfs4_set_sequence_privileged(&args.seq_args);
	status = nfs4_call_sync_sequence(clnt, server, &msg,
					&args.seq_args, &res.seq_res);
	if (status)
		return status;

	renew_lease(server, now);
	return 0;
}

#ifdef CONFIG_NFS_V4_1

/*
 * This operation also signals the server that this client is
 * performing migration recovery.  The server can stop asserting
 * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
 * performing this operation is identified in the SEQUENCE
 * operation in this compound.
 *
 * When the client supports GETATTR(fs_locations_info), it can
 * be plumbed in here.
 */
static int _nfs41_proc_get_locations(struct inode *inode,
				     struct nfs4_fs_locations *locations,
				     struct page *page, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct rpc_clnt *clnt = server->client;
	u32 bitmask[2] = {
		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
	};
	struct nfs4_fs_locations_arg args = {
		.fh		= NFS_FH(inode),
		.page		= page,
		.bitmask	= bitmask,
		.migration	= 1,		/* skip LOOKUP */
	};
	struct nfs4_fs_locations_res res = {
		.fs_locations	= locations,
		.migration	= 1,
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
		.rpc_argp	= &args,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
	};
	int status;

	nfs_fattr_init(&locations->fattr);
	locations->server = server;
	locations->nlocations = 0;

	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
	nfs4_set_sequence_privileged(&args.seq_args);
	status = nfs4_call_sync_sequence(clnt, server, &msg,
					&args.seq_args, &res.seq_res);
	if (status == NFS4_OK &&
	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
		status = -NFS4ERR_LEASE_MOVED;
	return status;
}

#endif	/* CONFIG_NFS_V4_1 */

/**
 * nfs4_proc_get_locations - discover locations for a migrated FSID
 * @inode: inode on FSID that is migrating
 * @locations: result of query
 * @page: buffer
 * @cred: credential to use for this operation
 *
 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
 * operation failed, or a negative errno if a local error occurred.
 *
 * On success, "locations" is filled in, but if the server has
 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
 * asserted.
 *
 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
 * from this client that require migration recovery.
 */
int nfs4_proc_get_locations(struct inode *inode,
			    struct nfs4_fs_locations *locations,
			    struct page *page, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_client *clp = server->nfs_client;
	const struct nfs4_mig_recovery_ops *ops =
					clp->cl_mvops->mig_recovery_ops;
	struct nfs4_exception exception = { };
	int status;

	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
		(unsigned long long)server->fsid.major,
		(unsigned long long)server->fsid.minor,
		clp->cl_hostname);
	nfs_display_fhandle(NFS_FH(inode), __func__);

	do {
		status = ops->get_locations(inode, locations, page, cred);
		if (status != -NFS4ERR_DELAY)
			break;
		nfs4_handle_exception(server, status, &exception);
	} while (exception.retry);
	return status;
}

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/*
 * This operation also signals the server that this client is
 * performing "lease moved" recovery.  The server can stop
 * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
 * is appended to this compound to identify the client ID which is
 * performing recovery.
 */
static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
	struct rpc_clnt *clnt = server->client;
	struct nfs4_fsid_present_arg args = {
		.fh		= NFS_FH(inode),
		.clientid	= clp->cl_clientid,
		.renew		= 1,		/* append RENEW */
	};
	struct nfs4_fsid_present_res res = {
		.renew		= 1,
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
		.rpc_argp	= &args,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
	};
	unsigned long now = jiffies;
	int status;

	res.fh = nfs_alloc_fhandle();
	if (res.fh == NULL)
		return -ENOMEM;

	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
	nfs4_set_sequence_privileged(&args.seq_args);
	status = nfs4_call_sync_sequence(clnt, server, &msg,
						&args.seq_args, &res.seq_res);
	nfs_free_fhandle(res.fh);
	if (status)
		return status;

	do_renew_lease(clp, now);
	return 0;
}

#ifdef CONFIG_NFS_V4_1

/*
 * This operation also signals the server that this client is
 * performing "lease moved" recovery.  The server can stop asserting
 * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
 * this operation is identified in the SEQUENCE operation in this
 * compound.
 */
static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct rpc_clnt *clnt = server->client;
	struct nfs4_fsid_present_arg args = {
		.fh		= NFS_FH(inode),
	};
	struct nfs4_fsid_present_res res = {
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
		.rpc_argp	= &args,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
	};
	int status;

	res.fh = nfs_alloc_fhandle();
	if (res.fh == NULL)
		return -ENOMEM;

	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
	nfs4_set_sequence_privileged(&args.seq_args);
	status = nfs4_call_sync_sequence(clnt, server, &msg,
						&args.seq_args, &res.seq_res);
	nfs_free_fhandle(res.fh);
	if (status == NFS4_OK &&
	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
		status = -NFS4ERR_LEASE_MOVED;
	return status;
}

#endif	/* CONFIG_NFS_V4_1 */

/**
 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
 * @inode: inode on FSID to check
 * @cred: credential to use for this operation
 *
 * Server indicates whether the FSID is present, moved, or not
 * recognized.  This operation is necessary to clear a LEASE_MOVED
 * condition for this client ID.
 *
 * Returns NFS4_OK if the FSID is present on this server,
 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
 *  NFS4ERR code if some error occurred on the server, or a
 *  negative errno if a local failure occurred.
 */
int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_client *clp = server->nfs_client;
	const struct nfs4_mig_recovery_ops *ops =
					clp->cl_mvops->mig_recovery_ops;
	struct nfs4_exception exception = { };
	int status;

	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
		(unsigned long long)server->fsid.major,
		(unsigned long long)server->fsid.minor,
		clp->cl_hostname);
	nfs_display_fhandle(NFS_FH(inode), __func__);

	do {
		status = ops->fsid_present(inode, cred);
		if (status != -NFS4ERR_DELAY)
			break;
		nfs4_handle_exception(server, status, &exception);
	} while (exception.retry);
	return status;
}

6657
/**
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 * If 'use_integrity' is true and the state managment nfs_client
 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
 * and the machine credential as per RFC3530bis and RFC5661 Security
 * Considerations sections. Otherwise, just use the user cred with the
 * filesystem's rpc_client.
6663
 */
6664
static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
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{
	int status;
	struct nfs4_secinfo_arg args = {
		.dir_fh = NFS_FH(dir),
		.name   = name,
	};
	struct nfs4_secinfo_res res = {
		.flavors     = flavors,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
6679
	struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6680
	struct rpc_cred *cred = NULL;
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	if (use_integrity) {
		clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
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		cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
		msg.rpc_cred = cred;
6686
	}
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	dprintk("NFS call  secinfo %s\n", name->name);
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	nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
		NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);

6693 6694
	status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
				&res.seq_res, 0);
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6695
	dprintk("NFS reply  secinfo: %d\n", status);
6696

6697 6698
	if (cred)
		put_rpccred(cred);
6699

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	return status;
}

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int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
		      struct nfs4_secinfo_flavors *flavors)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
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		err = -NFS4ERR_WRONGSEC;

		/* try to use integrity protection with machine cred */
		if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
			err = _nfs4_proc_secinfo(dir, name, flavors, true);

		/*
		 * if unable to use integrity protection, or SECINFO with
		 * integrity protection returns NFS4ERR_WRONGSEC (which is
		 * disallowed by spec, but exists in deployed servers) use
		 * the current filesystem's rpc_client and the user cred.
		 */
		if (err == -NFS4ERR_WRONGSEC)
			err = _nfs4_proc_secinfo(dir, name, flavors, false);

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		trace_nfs4_secinfo(dir, name, err);
		err = nfs4_handle_exception(NFS_SERVER(dir), err,
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				&exception);
	} while (exception.retry);
	return err;
}

6731
#ifdef CONFIG_NFS_V4_1
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/*
 * Check the exchange flags returned by the server for invalid flags, having
 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
 * DS flags set.
 */
static int nfs4_check_cl_exchange_flags(u32 flags)
{
	if (flags & ~EXCHGID4_FLAG_MASK_R)
		goto out_inval;
	if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
	    (flags & EXCHGID4_FLAG_USE_NON_PNFS))
		goto out_inval;
	if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
		goto out_inval;
	return NFS_OK;
out_inval:
	return -NFS4ERR_INVAL;
}

6751
static bool
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nfs41_same_server_scope(struct nfs41_server_scope *a,
			struct nfs41_server_scope *b)
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{
	if (a->server_scope_sz == b->server_scope_sz &&
	    memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
		return true;

	return false;
}

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/*
 * nfs4_proc_bind_conn_to_session()
 *
 * The 4.1 client currently uses the same TCP connection for the
 * fore and backchannel.
 */
6768
int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6769 6770
{
	int status;
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	struct nfs41_bind_conn_to_session_args args = {
		.client = clp,
		.dir = NFS4_CDFC4_FORE_OR_BOTH,
	};
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	struct nfs41_bind_conn_to_session_res res;
	struct rpc_message msg = {
		.rpc_proc =
			&nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6779
		.rpc_argp = &args,
6780
		.rpc_resp = &res,
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		.rpc_cred = cred,
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	};

	dprintk("--> %s\n", __func__);

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	nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
	if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
		args.dir = NFS4_CDFC4_FORE;
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	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6791
	trace_nfs4_bind_conn_to_session(clp, status);
6792
	if (status == 0) {
6793
		if (memcmp(res.sessionid.data,
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		    clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
			dprintk("NFS: %s: Session ID mismatch\n", __func__);
			status = -EIO;
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			goto out;
6798
		}
6799
		if ((res.dir & args.dir) != res.dir || res.dir == 0) {
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			dprintk("NFS: %s: Unexpected direction from server\n",
				__func__);
			status = -EIO;
6803
			goto out;
6804
		}
6805
		if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
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			dprintk("NFS: %s: Server returned RDMA mode = true\n",
				__func__);
			status = -EIO;
6809
			goto out;
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		}
	}
out:
	dprintk("<-- %s status= %d\n", __func__, status);
	return status;
}

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6817
/*
6818 6819
 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
 * and operations we'd like to see to enable certain features in the allow map
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 */
static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
	.how = SP4_MACH_CRED,
	.enforce.u.words = {
		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
		      1 << (OP_EXCHANGE_ID - 32) |
		      1 << (OP_CREATE_SESSION - 32) |
		      1 << (OP_DESTROY_SESSION - 32) |
		      1 << (OP_DESTROY_CLIENTID - 32)
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	},
	.allow.u.words = {
		[0] = 1 << (OP_CLOSE) |
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		      1 << (OP_LOCKU) |
		      1 << (OP_COMMIT),
6834
		[1] = 1 << (OP_SECINFO - 32) |
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		      1 << (OP_SECINFO_NO_NAME - 32) |
		      1 << (OP_TEST_STATEID - 32) |
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		      1 << (OP_FREE_STATEID - 32) |
		      1 << (OP_WRITE - 32)
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	}
};

/*
 * Select the state protection mode for client `clp' given the server results
 * from exchange_id in `sp'.
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6845
 *
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 * Returns 0 on success, negative errno otherwise.
 */
static int nfs4_sp4_select_mode(struct nfs_client *clp,
				 struct nfs41_state_protection *sp)
{
	static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
		      1 << (OP_EXCHANGE_ID - 32) |
		      1 << (OP_CREATE_SESSION - 32) |
		      1 << (OP_DESTROY_SESSION - 32) |
		      1 << (OP_DESTROY_CLIENTID - 32)
	};
	unsigned int i;

	if (sp->how == SP4_MACH_CRED) {
		/* Print state protect result */
		dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
		for (i = 0; i <= LAST_NFS4_OP; i++) {
			if (test_bit(i, sp->enforce.u.longs))
				dfprintk(MOUNT, "  enforce op %d\n", i);
			if (test_bit(i, sp->allow.u.longs))
				dfprintk(MOUNT, "  allow op %d\n", i);
		}

		/* make sure nothing is on enforce list that isn't supported */
		for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
			if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
				dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
				return -EINVAL;
			}
		}

		/*
		 * Minimal mode - state operations are allowed to use machine
		 * credential.  Note this already happens by default, so the
		 * client doesn't have to do anything more than the negotiation.
		 *
		 * NOTE: we don't care if EXCHANGE_ID is in the list -
		 *       we're already using the machine cred for exchange_id
		 *       and will never use a different cred.
		 */
		if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
		    test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
		    test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
		    test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
			dfprintk(MOUNT, "sp4_mach_cred:\n");
			dfprintk(MOUNT, "  minimal mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
		} else {
			dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
			return -EINVAL;
		}
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		if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
		    test_bit(OP_LOCKU, sp->allow.u.longs)) {
			dfprintk(MOUNT, "  cleanup mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
		}
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		if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
		    test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
			dfprintk(MOUNT, "  secinfo mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
		}
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		if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
		    test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
			dfprintk(MOUNT, "  stateid mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
		}
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		if (test_bit(OP_WRITE, sp->allow.u.longs)) {
			dfprintk(MOUNT, "  write mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
		}

		if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
			dfprintk(MOUNT, "  commit mode enabled\n");
			set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
		}
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	}

	return 0;
}

/*
 * _nfs4_proc_exchange_id()
6933
 *
6934
 * Wrapper for EXCHANGE_ID operation.
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 */
6936 6937
static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
	u32 sp4_how)
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{
	nfs4_verifier verifier;
	struct nfs41_exchange_id_args args = {
6941
		.verifier = &verifier,
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6942
		.client = clp,
6943
#ifdef CONFIG_NFS_V4_1_MIGRATION
6944
		.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
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			 EXCHGID4_FLAG_BIND_PRINC_STATEID |
			 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
#else
		.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
			 EXCHGID4_FLAG_BIND_PRINC_STATEID,
#endif
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	};
	struct nfs41_exchange_id_res res = {
6953
		0
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	};
	int status;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};

6963
	nfs4_init_boot_verifier(clp, &verifier);
6964 6965 6966

	status = nfs4_init_uniform_client_string(clp);
	if (status)
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		goto out;

	dprintk("NFS call  exchange_id auth=%s, '%s'\n",
6970
		clp->cl_rpcclient->cl_auth->au_ops->au_name,
6971
		clp->cl_owner_id);
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6972

6973
	res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6974
					GFP_NOFS);
6975
	if (unlikely(res.server_owner == NULL)) {
6976 6977 6978
		status = -ENOMEM;
		goto out;
	}
6979

6980
	res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6981
					GFP_NOFS);
6982
	if (unlikely(res.server_scope == NULL)) {
6983
		status = -ENOMEM;
6984
		goto out_server_owner;
6985
	}
6986

6987
	res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6988
	if (unlikely(res.impl_id == NULL)) {
6989 6990 6991 6992
		status = -ENOMEM;
		goto out_server_scope;
	}

6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005
	switch (sp4_how) {
	case SP4_NONE:
		args.state_protect.how = SP4_NONE;
		break;

	case SP4_MACH_CRED:
		args.state_protect = nfs4_sp4_mach_cred_request;
		break;

	default:
		/* unsupported! */
		WARN_ON_ONCE(1);
		status = -EINVAL;
7006
		goto out_impl_id;
7007 7008
	}

7009
	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7010
	trace_nfs4_exchange_id(clp, status);
7011
	if (status == 0)
7012
		status = nfs4_check_cl_exchange_flags(res.flags);
7013

7014 7015 7016
	if (status == 0)
		status = nfs4_sp4_select_mode(clp, &res.state_protect);

7017
	if (status == 0) {
7018
		clp->cl_clientid = res.clientid;
7019 7020 7021 7022 7023
		clp->cl_exchange_flags = res.flags;
		/* Client ID is not confirmed */
		if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
			clear_bit(NFS4_SESSION_ESTABLISHED,
					&clp->cl_session->session_state);
7024
			clp->cl_seqid = res.seqid;
7025
		}
7026

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		kfree(clp->cl_serverowner);
		clp->cl_serverowner = res.server_owner;
		res.server_owner = NULL;
7030

7031
		/* use the most recent implementation id */
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		kfree(clp->cl_implid);
		clp->cl_implid = res.impl_id;
7034
		res.impl_id = NULL;
7035

7036
		if (clp->cl_serverscope != NULL &&
7037
		    !nfs41_same_server_scope(clp->cl_serverscope,
7038 7039 7040 7041
					     res.server_scope)) {
			dprintk("%s: server_scope mismatch detected\n",
				__func__);
			set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7042 7043
			kfree(clp->cl_serverscope);
			clp->cl_serverscope = NULL;
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		}

7046
		if (clp->cl_serverscope == NULL) {
7047
			clp->cl_serverscope = res.server_scope;
7048
			res.server_scope = NULL;
7049
		}
7050
	}
7051

7052 7053
out_impl_id:
	kfree(res.impl_id);
7054
out_server_scope:
7055
	kfree(res.server_scope);
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out_server_owner:
	kfree(res.server_owner);
7058
out:
7059
	if (clp->cl_implid != NULL)
7060
		dprintk("NFS reply exchange_id: Server Implementation ID: "
7061
			"domain: %s, name: %s, date: %llu,%u\n",
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			clp->cl_implid->domain, clp->cl_implid->name,
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			clp->cl_implid->date.seconds,
			clp->cl_implid->date.nseconds);
7065
	dprintk("NFS reply exchange_id: %d\n", status);
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	return status;
}

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/*
 * nfs4_proc_exchange_id()
 *
 * Returns zero, a negative errno, or a negative NFS4ERR status code.
 *
 * Since the clientid has expired, all compounds using sessions
 * associated with the stale clientid will be returning
 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
 * be in some phase of session reset.
 *
 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
 */
int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
{
	rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
	int status;

	/* try SP4_MACH_CRED if krb5i/p	*/
	if (authflavor == RPC_AUTH_GSS_KRB5I ||
	    authflavor == RPC_AUTH_GSS_KRB5P) {
		status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
		if (!status)
			return 0;
	}

	/* try SP4_NONE */
	return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
}

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static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
		struct rpc_cred *cred)
{
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
		.rpc_argp = clp,
		.rpc_cred = cred,
	};
	int status;

	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7109
	trace_nfs4_destroy_clientid(clp, status);
7110
	if (status)
7111
		dprintk("NFS: Got error %d from the server %s on "
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			"DESTROY_CLIENTID.", status, clp->cl_hostname);
	return status;
}

static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
		struct rpc_cred *cred)
{
	unsigned int loop;
	int ret;

	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
		ret = _nfs4_proc_destroy_clientid(clp, cred);
		switch (ret) {
		case -NFS4ERR_DELAY:
		case -NFS4ERR_CLIENTID_BUSY:
			ssleep(1);
			break;
		default:
			return ret;
		}
	}
	return 0;
}

int nfs4_destroy_clientid(struct nfs_client *clp)
{
	struct rpc_cred *cred;
	int ret = 0;

	if (clp->cl_mvops->minor_version < 1)
		goto out;
	if (clp->cl_exchange_flags == 0)
		goto out;
7145 7146
	if (clp->cl_preserve_clid)
		goto out;
7147
	cred = nfs4_get_clid_cred(clp);
7148 7149 7150 7151 7152 7153 7154 7155 7156 7157 7158 7159
	ret = nfs4_proc_destroy_clientid(clp, cred);
	if (cred)
		put_rpccred(cred);
	switch (ret) {
	case 0:
	case -NFS4ERR_STALE_CLIENTID:
		clp->cl_exchange_flags = 0;
	}
out:
	return ret;
}

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struct nfs4_get_lease_time_data {
	struct nfs4_get_lease_time_args *args;
	struct nfs4_get_lease_time_res *res;
	struct nfs_client *clp;
};

static void nfs4_get_lease_time_prepare(struct rpc_task *task,
					void *calldata)
{
	struct nfs4_get_lease_time_data *data =
			(struct nfs4_get_lease_time_data *)calldata;

	dprintk("--> %s\n", __func__);
	/* just setup sequence, do not trigger session recovery
	   since we're invoked within one */
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	nfs41_setup_sequence(data->clp->cl_session,
			&data->args->la_seq_args,
			&data->res->lr_seq_res,
			task);
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	dprintk("<-- %s\n", __func__);
}

/*
 * Called from nfs4_state_manager thread for session setup, so don't recover
 * from sequence operation or clientid errors.
 */
static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_get_lease_time_data *data =
			(struct nfs4_get_lease_time_data *)calldata;

	dprintk("--> %s\n", __func__);
7192 7193
	if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
		return;
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	switch (task->tk_status) {
	case -NFS4ERR_DELAY:
	case -NFS4ERR_GRACE:
		dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
		rpc_delay(task, NFS4_POLL_RETRY_MIN);
		task->tk_status = 0;
7200 7201
		/* fall through */
	case -NFS4ERR_RETRY_UNCACHED_REP:
7202
		rpc_restart_call_prepare(task);
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		return;
	}
	dprintk("<-- %s\n", __func__);
}

7208
static const struct rpc_call_ops nfs4_get_lease_time_ops = {
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	.rpc_call_prepare = nfs4_get_lease_time_prepare,
	.rpc_call_done = nfs4_get_lease_time_done,
};

int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
{
	struct rpc_task *task;
	struct nfs4_get_lease_time_args args;
	struct nfs4_get_lease_time_res res = {
		.lr_fsinfo = fsinfo,
	};
	struct nfs4_get_lease_time_data data = {
		.args = &args,
		.res = &res,
		.clp = clp,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	struct rpc_task_setup task_setup = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs4_get_lease_time_ops,
7234 7235
		.callback_data = &data,
		.flags = RPC_TASK_TIMEOUT,
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	};
	int status;

7239
	nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7240
	nfs4_set_sequence_privileged(&args.la_seq_args);
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	dprintk("--> %s\n", __func__);
	task = rpc_run_task(&task_setup);

	if (IS_ERR(task))
		status = PTR_ERR(task);
	else {
		status = task->tk_status;
		rpc_put_task(task);
	}
	dprintk("<-- %s return %d\n", __func__, status);

	return status;
}

7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265
/*
 * Initialize the values to be used by the client in CREATE_SESSION
 * If nfs4_init_session set the fore channel request and response sizes,
 * use them.
 *
 * Set the back channel max_resp_sz_cached to zero to force the client to
 * always set csa_cachethis to FALSE because the current implementation
 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
 */
static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
{
7266 7267 7268 7269
	unsigned int max_rqst_sz, max_resp_sz;

	max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
	max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7270 7271

	/* Fore channel attributes */
7272 7273
	args->fc_attrs.max_rqst_sz = max_rqst_sz;
	args->fc_attrs.max_resp_sz = max_resp_sz;
7274
	args->fc_attrs.max_ops = NFS4_MAX_OPS;
7275
	args->fc_attrs.max_reqs = max_session_slots;
7276 7277

	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7278
		"max_ops=%u max_reqs=%u\n",
7279 7280
		__func__,
		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7281
		args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297

	/* Back channel attributes */
	args->bc_attrs.max_rqst_sz = PAGE_SIZE;
	args->bc_attrs.max_resp_sz = PAGE_SIZE;
	args->bc_attrs.max_resp_sz_cached = 0;
	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
	args->bc_attrs.max_reqs = 1;

	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
		__func__,
		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
		args->bc_attrs.max_reqs);
}

7298 7299
static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
		struct nfs41_create_session_res *res)
7300
{
7301
	struct nfs4_channel_attrs *sent = &args->fc_attrs;
7302
	struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314 7315

	if (rcvd->max_resp_sz > sent->max_resp_sz)
		return -EINVAL;
	/*
	 * Our requested max_ops is the minimum we need; we're not
	 * prepared to break up compounds into smaller pieces than that.
	 * So, no point even trying to continue if the server won't
	 * cooperate:
	 */
	if (rcvd->max_ops < sent->max_ops)
		return -EINVAL;
	if (rcvd->max_reqs == 0)
		return -EINVAL;
7316 7317
	if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
		rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7318
	return 0;
7319 7320
}

7321 7322
static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
		struct nfs41_create_session_res *res)
7323 7324
{
	struct nfs4_channel_attrs *sent = &args->bc_attrs;
7325
	struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7326

7327 7328
	if (!(res->flags & SESSION4_BACK_CHAN))
		goto out;
7329 7330 7331 7332 7333 7334 7335
	if (rcvd->max_rqst_sz > sent->max_rqst_sz)
		return -EINVAL;
	if (rcvd->max_resp_sz < sent->max_resp_sz)
		return -EINVAL;
	if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
		return -EINVAL;
	/* These would render the backchannel useless: */
7336
	if (rcvd->max_ops != sent->max_ops)
7337
		return -EINVAL;
7338
	if (rcvd->max_reqs != sent->max_reqs)
7339
		return -EINVAL;
7340
out:
7341 7342
	return 0;
}
7343 7344

static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7345
				     struct nfs41_create_session_res *res)
7346
{
7347
	int ret;
7348

7349
	ret = nfs4_verify_fore_channel_attrs(args, res);
7350 7351
	if (ret)
		return ret;
7352 7353 7354 7355 7356 7357 7358
	return nfs4_verify_back_channel_attrs(args, res);
}

static void nfs4_update_session(struct nfs4_session *session,
		struct nfs41_create_session_res *res)
{
	nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7359 7360 7361
	/* Mark client id and session as being confirmed */
	session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
	set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7362 7363
	session->flags = res->flags;
	memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
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	if (res->flags & SESSION4_BACK_CHAN)
		memcpy(&session->bc_attrs, &res->bc_attrs,
				sizeof(session->bc_attrs));
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}

7369 7370
static int _nfs4_proc_create_session(struct nfs_client *clp,
		struct rpc_cred *cred)
7371 7372 7373 7374
{
	struct nfs4_session *session = clp->cl_session;
	struct nfs41_create_session_args args = {
		.client = clp,
7375 7376
		.clientid = clp->cl_clientid,
		.seqid = clp->cl_seqid,
7377 7378
		.cb_program = NFS4_CALLBACK,
	};
7379 7380
	struct nfs41_create_session_res res;

7381 7382 7383 7384
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
		.rpc_argp = &args,
		.rpc_resp = &res,
7385
		.rpc_cred = cred,
7386 7387 7388 7389
	};
	int status;

	nfs4_init_channel_attrs(&args);
7390
	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7391

7392
	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7393
	trace_nfs4_create_session(clp, status);
7394

7395
	if (!status) {
7396
		/* Verify the session's negotiated channel_attrs values */
7397
		status = nfs4_verify_channel_attrs(&args, &res);
7398
		/* Increment the clientid slot sequence id */
7399 7400 7401 7402 7403
		if (clp->cl_seqid == res.seqid)
			clp->cl_seqid++;
		if (status)
			goto out;
		nfs4_update_session(session, &res);
7404
	}
7405
out:
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	return status;
}

/*
 * Issues a CREATE_SESSION operation to the server.
 * It is the responsibility of the caller to verify the session is
 * expired before calling this routine.
 */
7414
int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
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{
	int status;
	unsigned *ptr;
	struct nfs4_session *session = clp->cl_session;

	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);

7422
	status = _nfs4_proc_create_session(clp, cred);
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	if (status)
		goto out;

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	/* Init or reset the session slot tables */
	status = nfs4_setup_session_slot_tables(session);
	dprintk("slot table setup returned %d\n", status);
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	if (status)
		goto out;

	ptr = (unsigned *)&session->sess_id.data[0];
	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
out:
	dprintk("<-- %s\n", __func__);
	return status;
}

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/*
 * Issue the over-the-wire RPC DESTROY_SESSION.
 * The caller must serialize access to this routine.
 */
7444 7445
int nfs4_proc_destroy_session(struct nfs4_session *session,
		struct rpc_cred *cred)
7446
{
7447 7448 7449 7450 7451
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
		.rpc_argp = session,
		.rpc_cred = cred,
	};
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	int status = 0;

	dprintk("--> nfs4_proc_destroy_session\n");

	/* session is still being setup */
7457 7458
	if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
		return 0;
7459

7460
	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7461
	trace_nfs4_destroy_session(session->clp, status);
7462 7463

	if (status)
7464
		dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7465 7466 7467 7468 7469 7470
			"Session has been destroyed regardless...\n", status);

	dprintk("<-- nfs4_proc_destroy_session\n");
	return status;
}

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/*
 * Renew the cl_session lease.
 */
7474 7475 7476 7477 7478 7479
struct nfs4_sequence_data {
	struct nfs_client *clp;
	struct nfs4_sequence_args args;
	struct nfs4_sequence_res res;
};

7480 7481
static void nfs41_sequence_release(void *data)
{
7482 7483
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
7484

7485 7486 7487
	if (atomic_read(&clp->cl_count) > 1)
		nfs4_schedule_state_renewal(clp);
	nfs_put_client(clp);
7488
	kfree(calldata);
7489 7490
}

7491 7492 7493 7494 7495 7496 7497
static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
	switch(task->tk_status) {
	case -NFS4ERR_DELAY:
		rpc_delay(task, NFS4_POLL_RETRY_MAX);
		return -EAGAIN;
	default:
7498
		nfs4_schedule_lease_recovery(clp);
7499 7500 7501 7502
	}
	return 0;
}

7503
static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
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{
7505 7506
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
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7507

7508 7509
	if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
		return;
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7510

7511
	trace_nfs4_sequence(clp, task->tk_status);
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	if (task->tk_status < 0) {
		dprintk("%s ERROR %d\n", __func__, task->tk_status);
7514 7515
		if (atomic_read(&clp->cl_count) == 1)
			goto out;
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7516

7517 7518
		if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
			rpc_restart_call_prepare(task);
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			return;
		}
	}
	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7523
out:
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	dprintk("<-- %s\n", __func__);
}

static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
{
7529 7530
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
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	struct nfs4_sequence_args *args;
	struct nfs4_sequence_res *res;

	args = task->tk_msg.rpc_argp;
	res = task->tk_msg.rpc_resp;

7537
	nfs41_setup_sequence(clp->cl_session, args, res, task);
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}

static const struct rpc_call_ops nfs41_sequence_ops = {
	.rpc_call_done = nfs41_sequence_call_done,
	.rpc_call_prepare = nfs41_sequence_prepare,
7543
	.rpc_release = nfs41_sequence_release,
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};

7546 7547 7548
static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		struct rpc_cred *cred,
		bool is_privileged)
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{
7550
	struct nfs4_sequence_data *calldata;
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	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
		.rpc_cred = cred,
	};
7555 7556 7557
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
7558
		.callback_ops = &nfs41_sequence_ops,
7559
		.flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7560
	};
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7561

7562
	if (!atomic_inc_not_zero(&clp->cl_count))
7563
		return ERR_PTR(-EIO);
7564
	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7565
	if (calldata == NULL) {
7566
		nfs_put_client(clp);
7567
		return ERR_PTR(-ENOMEM);
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7568
	}
7569
	nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7570 7571
	if (is_privileged)
		nfs4_set_sequence_privileged(&calldata->args);
7572 7573 7574
	msg.rpc_argp = &calldata->args;
	msg.rpc_resp = &calldata->res;
	calldata->clp = clp;
7575
	task_setup_data.callback_data = calldata;
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7577 7578 7579
	return rpc_run_task(&task_setup_data);
}

7580
static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7581 7582 7583 7584
{
	struct rpc_task *task;
	int ret = 0;

7585
	if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7586
		return -EAGAIN;
7587
	task = _nfs41_proc_sequence(clp, cred, false);
7588 7589 7590
	if (IS_ERR(task))
		ret = PTR_ERR(task);
	else
7591
		rpc_put_task_async(task);
7592 7593 7594 7595 7596 7597 7598 7599 7600
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
}

static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
{
	struct rpc_task *task;
	int ret;

7601
	task = _nfs41_proc_sequence(clp, cred, true);
7602 7603 7604 7605 7606
	if (IS_ERR(task)) {
		ret = PTR_ERR(task);
		goto out;
	}
	ret = rpc_wait_for_completion_task(task);
7607
	if (!ret)
7608 7609 7610 7611 7612
		ret = task->tk_status;
	rpc_put_task(task);
out:
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
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}

7615 7616 7617 7618 7619 7620 7621 7622 7623 7624
struct nfs4_reclaim_complete_data {
	struct nfs_client *clp;
	struct nfs41_reclaim_complete_args arg;
	struct nfs41_reclaim_complete_res res;
};

static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;

7625 7626 7627 7628
	nfs41_setup_sequence(calldata->clp->cl_session,
			&calldata->arg.seq_args,
			&calldata->res.seq_res,
			task);
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}

7631 7632 7633 7634 7635 7636 7637 7638 7639
static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
	switch(task->tk_status) {
	case 0:
	case -NFS4ERR_COMPLETE_ALREADY:
	case -NFS4ERR_WRONG_CRED: /* What to do here? */
		break;
	case -NFS4ERR_DELAY:
		rpc_delay(task, NFS4_POLL_RETRY_MAX);
7640 7641
		/* fall through */
	case -NFS4ERR_RETRY_UNCACHED_REP:
7642 7643
		return -EAGAIN;
	default:
7644
		nfs4_schedule_lease_recovery(clp);
7645 7646 7647 7648
	}
	return 0;
}

7649 7650 7651 7652 7653 7654 7655
static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
	struct nfs4_sequence_res *res = &calldata->res.seq_res;

	dprintk("--> %s\n", __func__);
7656 7657
	if (!nfs41_sequence_done(task, res))
		return;
7658

7659
	trace_nfs4_reclaim_complete(clp, task->tk_status);
7660 7661 7662 7663
	if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
		rpc_restart_call_prepare(task);
		return;
	}
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	dprintk("<-- %s\n", __func__);
}

static void nfs4_free_reclaim_complete_data(void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;

	kfree(calldata);
}

static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
	.rpc_call_done = nfs4_reclaim_complete_done,
	.rpc_release = nfs4_free_reclaim_complete_data,
};

/*
 * Issue a global reclaim complete.
 */
7683 7684
static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
		struct rpc_cred *cred)
7685 7686 7687 7688 7689
{
	struct nfs4_reclaim_complete_data *calldata;
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7690
		.rpc_cred = cred,
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	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs4_reclaim_complete_call_ops,
		.flags = RPC_TASK_ASYNC,
	};
	int status = -ENOMEM;

	dprintk("--> %s\n", __func__);
7701
	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
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	if (calldata == NULL)
		goto out;
	calldata->clp = clp;
	calldata->arg.one_fs = 0;

7707
	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7708
	nfs4_set_sequence_privileged(&calldata->arg.seq_args);
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	msg.rpc_argp = &calldata->arg;
	msg.rpc_resp = &calldata->res;
	task_setup_data.callback_data = calldata;
	task = rpc_run_task(&task_setup_data);
7713
	if (IS_ERR(task)) {
7714
		status = PTR_ERR(task);
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		goto out;
	}
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	status = nfs4_wait_for_completion_rpc_task(task);
	if (status == 0)
		status = task->tk_status;
7720
	rpc_put_task(task);
7721
	return 0;
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out:
	dprintk("<-- %s status=%d\n", __func__, status);
	return status;
}
7726 7727 7728 7729 7730

static void
nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;
7731
	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7732
	struct nfs4_session *session = nfs4_get_session(server);
7733 7734

	dprintk("--> %s\n", __func__);
7735 7736 7737 7738 7739
	/* Note the is a race here, where a CB_LAYOUTRECALL can come in
	 * right now covering the LAYOUTGET we are about to send.
	 * However, that is not so catastrophic, and there seems
	 * to be no way to prevent it completely.
	 */
7740
	if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7741
				&lgp->res.seq_res, task))
7742
		return;
7743 7744
	if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
					  NFS_I(lgp->args.inode)->layout,
7745
					  &lgp->args.range,
7746 7747 7748
					  lgp->args.ctx->state)) {
		rpc_exit(task, NFS4_OK);
	}
7749 7750 7751 7752 7753
}

static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;
7754 7755 7756 7757
	struct inode *inode = lgp->args.inode;
	struct nfs_server *server = NFS_SERVER(inode);
	struct pnfs_layout_hdr *lo;
	struct nfs4_state *state = NULL;
7758
	unsigned long timeo, now, giveup;
7759

7760
	dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7761

7762
	if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7763
		goto out;
7764 7765 7766

	switch (task->tk_status) {
	case 0:
7767
		goto out;
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	/*
	 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
	 * (or clients) writing to the same RAID stripe
	 */
7772
	case -NFS4ERR_LAYOUTTRYLATER:
7773 7774 7775 7776
	/*
	 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
	 * existing layout before getting a new one).
	 */
7777
	case -NFS4ERR_RECALLCONFLICT:
7778 7779
		timeo = rpc_get_timeout(task->tk_client);
		giveup = lgp->args.timestamp + timeo;
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		now = jiffies;
		if (time_after(giveup, now)) {
			unsigned long delay;

			/* Delay for:
			 * - Not less then NFS4_POLL_RETRY_MIN.
			 * - One last time a jiffie before we give up
			 * - exponential backoff (time_now minus start_attempt)
			 */
			delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
				    min((giveup - now - 1),
					now - lgp->args.timestamp));

			dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
				__func__, delay);
			rpc_delay(task, delay);
			task->tk_status = 0;
			rpc_restart_call_prepare(task);
			goto out; /* Do not call nfs4_async_handle_error() */
		}
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		break;
	case -NFS4ERR_EXPIRED:
	case -NFS4ERR_BAD_STATEID:
		spin_lock(&inode->i_lock);
		lo = NFS_I(inode)->layout;
		if (!lo || list_empty(&lo->plh_segs)) {
			spin_unlock(&inode->i_lock);
			/* If the open stateid was bad, then recover it. */
			state = lgp->args.ctx->state;
		} else {
			LIST_HEAD(head);

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			/*
			 * Mark the bad layout state as invalid, then retry
			 * with the current stateid.
			 */
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			pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
			spin_unlock(&inode->i_lock);
			pnfs_free_lseg_list(&head);
7819 7820 7821
	
			task->tk_status = 0;
			rpc_restart_call_prepare(task);
7822 7823
		}
	}
7824
	if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
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		rpc_restart_call_prepare(task);
out:
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	dprintk("<-- %s\n", __func__);
}

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static size_t max_response_pages(struct nfs_server *server)
{
	u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
	return nfs_page_array_len(0, max_resp_sz);
}

static void nfs4_free_pages(struct page **pages, size_t size)
{
	int i;

	if (!pages)
		return;

	for (i = 0; i < size; i++) {
		if (!pages[i])
			break;
		__free_page(pages[i]);
	}
	kfree(pages);
}

static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
{
	struct page **pages;
	int i;

	pages = kcalloc(size, sizeof(struct page *), gfp_flags);
	if (!pages) {
		dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
		return NULL;
	}

	for (i = 0; i < size; i++) {
		pages[i] = alloc_page(gfp_flags);
		if (!pages[i]) {
			dprintk("%s: failed to allocate page\n", __func__);
			nfs4_free_pages(pages, size);
			return NULL;
		}
	}

	return pages;
}

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static void nfs4_layoutget_release(void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;
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	struct inode *inode = lgp->args.inode;
	struct nfs_server *server = NFS_SERVER(inode);
7879
	size_t max_pages = max_response_pages(server);
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	dprintk("--> %s\n", __func__);
7882
	nfs4_free_pages(lgp->args.layout.pages, max_pages);
7883
	pnfs_put_layout_hdr(NFS_I(inode)->layout);
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	put_nfs_open_context(lgp->args.ctx);
	kfree(calldata);
	dprintk("<-- %s\n", __func__);
}

static const struct rpc_call_ops nfs4_layoutget_call_ops = {
	.rpc_call_prepare = nfs4_layoutget_prepare,
	.rpc_call_done = nfs4_layoutget_done,
	.rpc_release = nfs4_layoutget_release,
};

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struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7897
{
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	struct inode *inode = lgp->args.inode;
	struct nfs_server *server = NFS_SERVER(inode);
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	size_t max_pages = max_response_pages(server);
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	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
		.rpc_argp = &lgp->args,
		.rpc_resp = &lgp->res,
7906
		.rpc_cred = lgp->cred,
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	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
		.rpc_message = &msg,
		.callback_ops = &nfs4_layoutget_call_ops,
		.callback_data = lgp,
		.flags = RPC_TASK_ASYNC,
	};
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	struct pnfs_layout_segment *lseg = NULL;
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	int status = 0;

	dprintk("--> %s\n", __func__);

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	/* nfs4_layoutget_release calls pnfs_put_layout_hdr */
	pnfs_get_layout_hdr(NFS_I(inode)->layout);

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	lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
	if (!lgp->args.layout.pages) {
		nfs4_layoutget_release(lgp);
7926
		return ERR_PTR(-ENOMEM);
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	}
	lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7929
	lgp->args.timestamp = jiffies;
7930

7931
	lgp->res.layoutp = &lgp->args.layout;
7932
	lgp->res.seq_res.sr_slot = NULL;
7933
	nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7934

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	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
7937
		return ERR_CAST(task);
7938
	status = nfs4_wait_for_completion_rpc_task(task);
7939 7940
	if (status == 0)
		status = task->tk_status;
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	trace_nfs4_layoutget(lgp->args.ctx,
			&lgp->args.range,
			&lgp->res.range,
			status);
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	/* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
	if (status == 0 && lgp->res.layoutp->len)
7947
		lseg = pnfs_layout_process(lgp);
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	rpc_put_task(task);
	dprintk("<-- %s status=%d\n", __func__, status);
7950 7951 7952
	if (status)
		return ERR_PTR(status);
	return lseg;
7953 7954
}

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static void
nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutreturn *lrp = calldata;

	dprintk("--> %s\n", __func__);
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	nfs41_setup_sequence(lrp->clp->cl_session,
			&lrp->args.seq_args,
			&lrp->res.seq_res,
			task);
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}

static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutreturn *lrp = calldata;
	struct nfs_server *server;

	dprintk("--> %s\n", __func__);

7974
	if (!nfs41_sequence_done(task, &lrp->res.seq_res))
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		return;

	server = NFS_SERVER(lrp->args.inode);
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	switch (task->tk_status) {
	default:
		task->tk_status = 0;
	case 0:
		break;
	case -NFS4ERR_DELAY:
7984
		if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7985
			break;
7986
		rpc_restart_call_prepare(task);
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		return;
	}
	dprintk("<-- %s\n", __func__);
}

static void nfs4_layoutreturn_release(void *calldata)
{
	struct nfs4_layoutreturn *lrp = calldata;
7995
	struct pnfs_layout_hdr *lo = lrp->args.layout;
7996
	LIST_HEAD(freeme);
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	dprintk("--> %s\n", __func__);
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	spin_lock(&lo->plh_inode->i_lock);
	if (lrp->res.lrs_present)
		pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8002
	pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
8003
	pnfs_clear_layoutreturn_waitbit(lo);
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	lo->plh_block_lgets--;
	spin_unlock(&lo->plh_inode->i_lock);
8006
	pnfs_free_lseg_list(&freeme);
8007
	pnfs_put_layout_hdr(lrp->args.layout);
8008
	nfs_iput_and_deactive(lrp->inode);
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	kfree(calldata);
	dprintk("<-- %s\n", __func__);
}

static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
	.rpc_call_prepare = nfs4_layoutreturn_prepare,
	.rpc_call_done = nfs4_layoutreturn_done,
	.rpc_release = nfs4_layoutreturn_release,
};

8019
int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
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{
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
		.rpc_argp = &lrp->args,
		.rpc_resp = &lrp->res,
8026
		.rpc_cred = lrp->cred,
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	};
	struct rpc_task_setup task_setup_data = {
8029
		.rpc_client = NFS_SERVER(lrp->args.inode)->client,
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		.rpc_message = &msg,
		.callback_ops = &nfs4_layoutreturn_call_ops,
		.callback_data = lrp,
	};
8034
	int status = 0;
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	dprintk("--> %s\n", __func__);
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	if (!sync) {
		lrp->inode = nfs_igrab_and_active(lrp->args.inode);
		if (!lrp->inode) {
			nfs4_layoutreturn_release(lrp);
			return -EAGAIN;
		}
		task_setup_data.flags |= RPC_TASK_ASYNC;
	}
8045
	nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
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	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
8049 8050
	if (sync)
		status = task->tk_status;
8051
	trace_nfs4_layoutreturn(lrp->args.inode, status);
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	dprintk("<-- %s status=%d\n", __func__, status);
	rpc_put_task(task);
	return status;
}

8057
static int
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_nfs4_proc_getdeviceinfo(struct nfs_server *server,
		struct pnfs_device *pdev,
		struct rpc_cred *cred)
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{
	struct nfs4_getdeviceinfo_args args = {
		.pdev = pdev,
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		.notify_types = NOTIFY_DEVICEID4_CHANGE |
			NOTIFY_DEVICEID4_DELETE,
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	};
	struct nfs4_getdeviceinfo_res res = {
		.pdev = pdev,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
		.rpc_argp = &args,
		.rpc_resp = &res,
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		.rpc_cred = cred,
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	};
	int status;

	dprintk("--> %s\n", __func__);
8079
	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8080 8081
	if (res.notification & ~args.notify_types)
		dprintk("%s: unsupported notification\n", __func__);
8082 8083
	if (res.notification != args.notify_types)
		pdev->nocache = 1;
8084

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	dprintk("<-- %s status=%d\n", __func__, status);

	return status;
}

8090 8091 8092
int nfs4_proc_getdeviceinfo(struct nfs_server *server,
		struct pnfs_device *pdev,
		struct rpc_cred *cred)
8093 8094 8095 8096 8097 8098
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(server,
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					_nfs4_proc_getdeviceinfo(server, pdev, cred),
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					&exception);
	} while (exception.retry);
	return err;
}
EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);

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static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutcommit_data *data = calldata;
	struct nfs_server *server = NFS_SERVER(data->args.inode);
8110
	struct nfs4_session *session = nfs4_get_session(server);
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	nfs41_setup_sequence(session,
			&data->args.seq_args,
			&data->res.seq_res,
			task);
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}

static void
nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutcommit_data *data = calldata;
	struct nfs_server *server = NFS_SERVER(data->args.inode);

8124
	if (!nfs41_sequence_done(task, &data->res.seq_res))
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		return;

	switch (task->tk_status) { /* Just ignore these failures */
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	case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
	case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
	case -NFS4ERR_BADLAYOUT:     /* no layout */
	case -NFS4ERR_GRACE:	    /* loca_recalim always false */
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		task->tk_status = 0;
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	case 0:
		break;
	default:
8136
		if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
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			rpc_restart_call_prepare(task);
			return;
		}
	}
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}

static void nfs4_layoutcommit_release(void *calldata)
{
	struct nfs4_layoutcommit_data *data = calldata;

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	pnfs_cleanup_layoutcommit(data);
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	nfs_post_op_update_inode_force_wcc(data->args.inode,
					   data->res.fattr);
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	put_rpccred(data->cred);
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	nfs_iput_and_deactive(data->inode);
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	kfree(data);
}

static const struct rpc_call_ops nfs4_layoutcommit_ops = {
	.rpc_call_prepare = nfs4_layoutcommit_prepare,
	.rpc_call_done = nfs4_layoutcommit_done,
	.rpc_release = nfs4_layoutcommit_release,
};

int
8162
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
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{
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
		.rpc_argp = &data->args,
		.rpc_resp = &data->res,
		.rpc_cred = data->cred,
	};
	struct rpc_task_setup task_setup_data = {
		.task = &data->task,
		.rpc_client = NFS_CLIENT(data->args.inode),
		.rpc_message = &msg,
		.callback_ops = &nfs4_layoutcommit_ops,
		.callback_data = data,
	};
	struct rpc_task *task;
	int status = 0;

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	dprintk("NFS: initiating layoutcommit call. sync %d "
		"lbw: %llu inode %lu\n", sync,
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		data->args.lastbytewritten,
		data->args.inode->i_ino);

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	if (!sync) {
		data->inode = nfs_igrab_and_active(data->args.inode);
		if (data->inode == NULL) {
			nfs4_layoutcommit_release(data);
			return -EAGAIN;
		}
		task_setup_data.flags = RPC_TASK_ASYNC;
	}
8193
	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
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	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
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	if (sync)
		status = task->tk_status;
8199
	trace_nfs4_layoutcommit(data->args.inode, status);
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	dprintk("%s: status %d\n", __func__, status);
	rpc_put_task(task);
	return status;
}
8204

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/**
 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
 */
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static int
_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8211 8212
		    struct nfs_fsinfo *info,
		    struct nfs4_secinfo_flavors *flavors, bool use_integrity)
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{
	struct nfs41_secinfo_no_name_args args = {
		.style = SECINFO_STYLE_CURRENT_FH,
	};
	struct nfs4_secinfo_res res = {
		.flavors = flavors,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
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	struct rpc_clnt *clnt = server->client;
8226
	struct rpc_cred *cred = NULL;
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	int status;

	if (use_integrity) {
		clnt = server->nfs_client->cl_rpcclient;
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		cred = nfs4_get_clid_cred(server->nfs_client);
		msg.rpc_cred = cred;
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	}

	dprintk("--> %s\n", __func__);
	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
				&res.seq_res, 0);
	dprintk("<-- %s status=%d\n", __func__, status);

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	if (cred)
		put_rpccred(cred);
8242 8243

	return status;
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}

static int
nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
			   struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
{
	struct nfs4_exception exception = { };
	int err;
	do {
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		/* first try using integrity protection */
		err = -NFS4ERR_WRONGSEC;

		/* try to use integrity protection with machine cred */
		if (_nfs4_is_integrity_protected(server->nfs_client))
			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
							  flavors, true);

		/*
		 * if unable to use integrity protection, or SECINFO with
		 * integrity protection returns NFS4ERR_WRONGSEC (which is
		 * disallowed by spec, but exists in deployed servers) use
		 * the current filesystem's rpc_client and the user cred.
		 */
		if (err == -NFS4ERR_WRONGSEC)
			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
							  flavors, false);

8271 8272 8273
		switch (err) {
		case 0:
		case -NFS4ERR_WRONGSEC:
8274
		case -ENOTSUPP:
8275
			goto out;
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		default:
			err = nfs4_handle_exception(server, err, &exception);
		}
	} while (exception.retry);
8280
out:
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	return err;
}

static int
nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
		    struct nfs_fsinfo *info)
{
	int err;
	struct page *page;
8290
	rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8291
	struct nfs4_secinfo_flavors *flavors;
8292 8293
	struct nfs4_secinfo4 *secinfo;
	int i;
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	page = alloc_page(GFP_KERNEL);
	if (!page) {
		err = -ENOMEM;
		goto out;
	}

	flavors = page_address(page);
	err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);

	/*
	 * Fall back on "guess and check" method if
	 * the server doesn't support SECINFO_NO_NAME
	 */
8308
	if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
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		err = nfs4_find_root_sec(server, fhandle, info);
		goto out_freepage;
	}
	if (err)
		goto out_freepage;

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	for (i = 0; i < flavors->num_flavors; i++) {
		secinfo = &flavors->flavors[i];

		switch (secinfo->flavor) {
		case RPC_AUTH_NULL:
		case RPC_AUTH_UNIX:
		case RPC_AUTH_GSS:
			flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
					&secinfo->flavor_info);
			break;
		default:
			flavor = RPC_AUTH_MAXFLAVOR;
			break;
		}

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		if (!nfs_auth_info_match(&server->auth_info, flavor))
			flavor = RPC_AUTH_MAXFLAVOR;

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		if (flavor != RPC_AUTH_MAXFLAVOR) {
			err = nfs4_lookup_root_sec(server, fhandle,
						   info, flavor);
			if (!err)
				break;
		}
	}

	if (flavor == RPC_AUTH_MAXFLAVOR)
		err = -EPERM;
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out_freepage:
	put_page(page);
	if (err == -EACCES)
		return -EPERM;
out:
	return err;
}
8351

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static int _nfs41_test_stateid(struct nfs_server *server,
		nfs4_stateid *stateid,
		struct rpc_cred *cred)
8355 8356 8357
{
	int status;
	struct nfs41_test_stateid_args args = {
8358
		.stateid = stateid,
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	};
	struct nfs41_test_stateid_res res;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
		.rpc_argp = &args,
		.rpc_resp = &res,
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		.rpc_cred = cred,
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	};
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	struct rpc_clnt *rpc_client = server->client;

	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
		&rpc_client, &msg);
8371

8372
	dprintk("NFS call  test_stateid %p\n", stateid);
8373
	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8374
	nfs4_set_sequence_privileged(&args.seq_args);
8375
	status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8376
			&args.seq_args, &res.seq_res);
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	if (status != NFS_OK) {
		dprintk("NFS reply test_stateid: failed, %d\n", status);
8379
		return status;
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	}
	dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8382
	return -res.status;
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}

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/**
 * nfs41_test_stateid - perform a TEST_STATEID operation
 *
 * @server: server / transport on which to perform the operation
 * @stateid: state ID to test
8390
 * @cred: credential
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 *
 * Returns NFS_OK if the server recognizes that "stateid" is valid.
 * Otherwise a negative NFS4ERR value is returned if the operation
 * failed or the state ID is not currently valid.
 */
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static int nfs41_test_stateid(struct nfs_server *server,
		nfs4_stateid *stateid,
		struct rpc_cred *cred)
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{
	struct nfs4_exception exception = { };
	int err;
	do {
8403
		err = _nfs41_test_stateid(server, stateid, cred);
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		if (err != -NFS4ERR_DELAY)
			break;
		nfs4_handle_exception(server, err, &exception);
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	} while (exception.retry);
	return err;
}
8410

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struct nfs_free_stateid_data {
	struct nfs_server *server;
	struct nfs41_free_stateid_args args;
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	struct nfs41_free_stateid_res res;
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};

static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs_free_stateid_data *data = calldata;
	nfs41_setup_sequence(nfs4_get_session(data->server),
			&data->args.seq_args,
			&data->res.seq_res,
			task);
}

static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
{
	struct nfs_free_stateid_data *data = calldata;

	nfs41_sequence_done(task, &data->res.seq_res);

	switch (task->tk_status) {
	case -NFS4ERR_DELAY:
8434
		if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
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			rpc_restart_call_prepare(task);
	}
}

static void nfs41_free_stateid_release(void *calldata)
{
	kfree(calldata);
}

8444
static const struct rpc_call_ops nfs41_free_stateid_ops = {
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	.rpc_call_prepare = nfs41_free_stateid_prepare,
	.rpc_call_done = nfs41_free_stateid_done,
	.rpc_release = nfs41_free_stateid_release,
};

static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
		nfs4_stateid *stateid,
8452
		struct rpc_cred *cred,
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		bool privileged)
{
8455 8456
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8457
		.rpc_cred = cred,
8458
	};
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	struct rpc_task_setup task_setup = {
		.rpc_client = server->client,
		.rpc_message = &msg,
		.callback_ops = &nfs41_free_stateid_ops,
		.flags = RPC_TASK_ASYNC,
	};
	struct nfs_free_stateid_data *data;
8466

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	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
		&task_setup.rpc_client, &msg);

8470
	dprintk("NFS call  free_stateid %p\n", stateid);
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	data = kmalloc(sizeof(*data), GFP_NOFS);
	if (!data)
		return ERR_PTR(-ENOMEM);
	data->server = server;
	nfs4_stateid_copy(&data->args.stateid, stateid);

	task_setup.callback_data = data;

	msg.rpc_argp = &data->args;
	msg.rpc_resp = &data->res;
8481
	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
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	if (privileged)
		nfs4_set_sequence_privileged(&data->args.seq_args);

	return rpc_run_task(&task_setup);
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}

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/**
 * nfs41_free_stateid - perform a FREE_STATEID operation
 *
 * @server: server / transport on which to perform the operation
 * @stateid: state ID to release
8493
 * @cred: credential
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 *
 * Returns NFS_OK if the server freed "stateid".  Otherwise a
 * negative NFS4ERR value is returned.
 */
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static int nfs41_free_stateid(struct nfs_server *server,
		nfs4_stateid *stateid,
		struct rpc_cred *cred)
8501
{
8502 8503 8504
	struct rpc_task *task;
	int ret;

8505
	task = _nfs41_free_stateid(server, stateid, cred, true);
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	if (IS_ERR(task))
		return PTR_ERR(task);
	ret = rpc_wait_for_completion_task(task);
	if (!ret)
		ret = task->tk_status;
	rpc_put_task(task);
	return ret;
8513
}
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8515 8516
static void
nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8517 8518
{
	struct rpc_task *task;
8519
	struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8520

8521
	task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
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	nfs4_free_lock_state(server, lsp);
	if (IS_ERR(task))
8524
		return;
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	rpc_put_task(task);
}

8528 8529 8530
static bool nfs41_match_stateid(const nfs4_stateid *s1,
		const nfs4_stateid *s2)
{
8531
	if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8532 8533
		return false;

8534
	if (s1->seqid == s2->seqid)
8535
		return true;
8536
	if (s1->seqid == 0 || s2->seqid == 0)
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		return true;

	return false;
}

8542 8543
#endif /* CONFIG_NFS_V4_1 */

8544 8545 8546
static bool nfs4_match_stateid(const nfs4_stateid *s1,
		const nfs4_stateid *s2)
{
8547
	return nfs4_stateid_match(s1, s2);
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}


8551
static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8552
	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8553
	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
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	.recover_open	= nfs4_open_reclaim,
	.recover_lock	= nfs4_lock_reclaim,
8556
	.establish_clid = nfs4_init_clientid,
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	.detect_trunking = nfs40_discover_server_trunking,
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};

8560
#if defined(CONFIG_NFS_V4_1)
8561
static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
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	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
	.recover_open	= nfs4_open_reclaim,
	.recover_lock	= nfs4_lock_reclaim,
8566
	.establish_clid = nfs41_init_clientid,
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	.reclaim_complete = nfs41_proc_reclaim_complete,
8568
	.detect_trunking = nfs41_discover_server_trunking,
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};
#endif /* CONFIG_NFS_V4_1 */

8572
static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
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	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
8575
	.recover_open	= nfs40_open_expired,
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	.recover_lock	= nfs4_lock_expired,
	.establish_clid = nfs4_init_clientid,
};

#if defined(CONFIG_NFS_V4_1)
8581
static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8582
	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8583
	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
8584 8585
	.recover_open	= nfs41_open_expired,
	.recover_lock	= nfs41_lock_expired,
8586
	.establish_clid = nfs41_init_clientid,
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};
8588
#endif /* CONFIG_NFS_V4_1 */
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8589

8590
static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
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	.sched_state_renewal = nfs4_proc_async_renew,
8592
	.get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8593
	.renew_lease = nfs4_proc_renew,
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};

#if defined(CONFIG_NFS_V4_1)
8597
static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
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	.sched_state_renewal = nfs41_proc_async_sequence,
8599
	.get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
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	.renew_lease = nfs4_proc_sequence,
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};
#endif

8604
static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8605
	.get_locations = _nfs40_proc_get_locations,
8606
	.fsid_present = _nfs40_proc_fsid_present,
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};

#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
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	.get_locations = _nfs41_proc_get_locations,
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	.fsid_present = _nfs41_proc_fsid_present,
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};
#endif	/* CONFIG_NFS_V4_1 */

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static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
	.minor_version = 0,
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	.init_caps = NFS_CAP_READDIRPLUS
		| NFS_CAP_ATOMIC_OPEN
		| NFS_CAP_POSIX_LOCK,
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	.init_client = nfs40_init_client,
	.shutdown_client = nfs40_shutdown_client,
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	.match_stateid = nfs4_match_stateid,
8624
	.find_root_sec = nfs4_find_root_sec,
8625
	.free_lock_state = nfs4_release_lockowner,
8626
	.alloc_seqid = nfs_alloc_seqid,
8627
	.call_sync_ops = &nfs40_call_sync_ops,
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	.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
	.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
	.state_renewal_ops = &nfs40_state_renewal_ops,
8631
	.mig_recovery_ops = &nfs40_mig_recovery_ops,
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};

#if defined(CONFIG_NFS_V4_1)
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static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
{
	return NULL;
}

8641 8642
static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
	.minor_version = 1,
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	.init_caps = NFS_CAP_READDIRPLUS
		| NFS_CAP_ATOMIC_OPEN
8645
		| NFS_CAP_POSIX_LOCK
8646
		| NFS_CAP_STATEID_NFSV41
8647
		| NFS_CAP_ATOMIC_OPEN_V1,
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	.init_client = nfs41_init_client,
	.shutdown_client = nfs41_shutdown_client,
8650
	.match_stateid = nfs41_match_stateid,
8651
	.find_root_sec = nfs41_find_root_sec,
8652
	.free_lock_state = nfs41_free_lock_state,
8653
	.alloc_seqid = nfs_alloc_no_seqid,
8654
	.call_sync_ops = &nfs41_call_sync_ops,
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	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
	.state_renewal_ops = &nfs41_state_renewal_ops,
8658
	.mig_recovery_ops = &nfs41_mig_recovery_ops,
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};
#endif

8662 8663 8664
#if defined(CONFIG_NFS_V4_2)
static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
	.minor_version = 2,
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	.init_caps = NFS_CAP_READDIRPLUS
		| NFS_CAP_ATOMIC_OPEN
		| NFS_CAP_POSIX_LOCK
		| NFS_CAP_STATEID_NFSV41
8669
		| NFS_CAP_ATOMIC_OPEN_V1
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		| NFS_CAP_ALLOCATE
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		| NFS_CAP_DEALLOCATE
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		| NFS_CAP_SEEK
		| NFS_CAP_LAYOUTSTATS,
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	.init_client = nfs41_init_client,
	.shutdown_client = nfs41_shutdown_client,
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	.match_stateid = nfs41_match_stateid,
	.find_root_sec = nfs41_find_root_sec,
8678
	.free_lock_state = nfs41_free_lock_state,
8679
	.call_sync_ops = &nfs41_call_sync_ops,
8680
	.alloc_seqid = nfs_alloc_no_seqid,
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	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
	.state_renewal_ops = &nfs41_state_renewal_ops,
8684
	.mig_recovery_ops = &nfs41_mig_recovery_ops,
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};
#endif

8688 8689 8690 8691 8692
const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
	[0] = &nfs_v4_0_minor_ops,
#if defined(CONFIG_NFS_V4_1)
	[1] = &nfs_v4_1_minor_ops,
#endif
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#if defined(CONFIG_NFS_V4_2)
	[2] = &nfs_v4_2_minor_ops,
#endif
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};

8698
static const struct inode_operations nfs4_dir_inode_operations = {
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	.create		= nfs_create,
	.lookup		= nfs_lookup,
	.atomic_open	= nfs_atomic_open,
	.link		= nfs_link,
	.unlink		= nfs_unlink,
	.symlink	= nfs_symlink,
	.mkdir		= nfs_mkdir,
	.rmdir		= nfs_rmdir,
	.mknod		= nfs_mknod,
	.rename		= nfs_rename,
	.permission	= nfs_permission,
	.getattr	= nfs_getattr,
	.setattr	= nfs_setattr,
	.getxattr	= generic_getxattr,
	.setxattr	= generic_setxattr,
	.listxattr	= generic_listxattr,
	.removexattr	= generic_removexattr,
};

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static const struct inode_operations nfs4_file_inode_operations = {
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	.permission	= nfs_permission,
	.getattr	= nfs_getattr,
	.setattr	= nfs_setattr,
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	.getxattr	= generic_getxattr,
	.setxattr	= generic_setxattr,
	.listxattr	= generic_listxattr,
	.removexattr	= generic_removexattr,
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};

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const struct nfs_rpc_ops nfs_v4_clientops = {
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	.version	= 4,			/* protocol version */
	.dentry_ops	= &nfs4_dentry_operations,
	.dir_inode_ops	= &nfs4_dir_inode_operations,
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	.file_inode_ops	= &nfs4_file_inode_operations,
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	.file_ops	= &nfs4_file_operations,
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	.getroot	= nfs4_proc_get_root,
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	.submount	= nfs4_submount,
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	.try_mount	= nfs4_try_mount,
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	.getattr	= nfs4_proc_getattr,
	.setattr	= nfs4_proc_setattr,
	.lookup		= nfs4_proc_lookup,
	.access		= nfs4_proc_access,
	.readlink	= nfs4_proc_readlink,
	.create		= nfs4_proc_create,
	.remove		= nfs4_proc_remove,
	.unlink_setup	= nfs4_proc_unlink_setup,
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	.unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
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	.unlink_done	= nfs4_proc_unlink_done,
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	.rename_setup	= nfs4_proc_rename_setup,
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	.rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
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	.rename_done	= nfs4_proc_rename_done,
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	.link		= nfs4_proc_link,
	.symlink	= nfs4_proc_symlink,
	.mkdir		= nfs4_proc_mkdir,
	.rmdir		= nfs4_proc_remove,
	.readdir	= nfs4_proc_readdir,
	.mknod		= nfs4_proc_mknod,
	.statfs		= nfs4_proc_statfs,
	.fsinfo		= nfs4_proc_fsinfo,
	.pathconf	= nfs4_proc_pathconf,
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	.set_capabilities = nfs4_server_capabilities,
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	.decode_dirent	= nfs4_decode_dirent,
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	.pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
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	.read_setup	= nfs4_proc_read_setup,
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	.read_done	= nfs4_read_done,
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	.write_setup	= nfs4_proc_write_setup,
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	.write_done	= nfs4_write_done,
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	.commit_setup	= nfs4_proc_commit_setup,
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	.commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
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	.commit_done	= nfs4_commit_done,
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	.lock		= nfs4_proc_lock,
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	.clear_acl_cache = nfs4_zap_acl_attr,
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	.close_context  = nfs4_close_context,
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	.open_context	= nfs4_atomic_open,
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	.have_delegation = nfs4_have_delegation,
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	.return_delegation = nfs4_inode_return_delegation,
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	.alloc_client	= nfs4_alloc_client,
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	.init_client	= nfs4_init_client,
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	.free_client	= nfs4_free_client,
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	.create_server	= nfs4_create_server,
	.clone_server	= nfs_clone_server,
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};

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static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
	.prefix	= XATTR_NAME_NFSV4_ACL,
	.list	= nfs4_xattr_list_nfs4_acl,
	.get	= nfs4_xattr_get_nfs4_acl,
	.set	= nfs4_xattr_set_nfs4_acl,
};

const struct xattr_handler *nfs4_xattr_handlers[] = {
	&nfs4_xattr_nfs4_acl_handler,
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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	&nfs4_xattr_nfs4_label_handler,
#endif
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	NULL
};

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/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */