inode.c 62 KB
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/*
 *   fs/cifs/inode.c
 *
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 *   Copyright (C) International Business Machines  Corp., 2002,2010
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 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/freezer.h>
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#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#include "fscache.h"
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static void cifs_set_ops(struct inode *inode)
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{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &cifs_file_inode_ops;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_direct_nobrl_ops;
			else
				inode->i_fop = &cifs_file_direct_ops;
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		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_strict_nobrl_ops;
			else
				inode->i_fop = &cifs_file_strict_ops;
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		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
			inode->i_fop = &cifs_file_nobrl_ops;
		else { /* not direct, send byte range locks */
			inode->i_fop = &cifs_file_ops;
		}

		/* check if server can support readpages */
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		if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
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				PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
		else
			inode->i_data.a_ops = &cifs_addr_ops;
		break;
	case S_IFDIR:
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#ifdef CONFIG_CIFS_DFS_UPCALL
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		if (IS_AUTOMOUNT(inode)) {
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			inode->i_op = &cifs_dfs_referral_inode_operations;
		} else {
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#else /* NO DFS support, treat as a directory */
		{
#endif
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			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		}
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		break;
	case S_IFLNK:
		inode->i_op = &cifs_symlink_inode_ops;
		break;
	default:
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}
}

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/* check inode attributes against fattr. If they don't match, tag the
 * inode for cache invalidation
 */
static void
cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
{
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);

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	cifs_dbg(FYI, "%s: revalidating inode %llu\n",
		 __func__, cifs_i->uniqueid);
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	if (inode->i_state & I_NEW) {
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		cifs_dbg(FYI, "%s: inode %llu is new\n",
			 __func__, cifs_i->uniqueid);
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		return;
	}

	/* don't bother with revalidation if we have an oplock */
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	if (CIFS_CACHE_READ(cifs_i)) {
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		cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
			 __func__, cifs_i->uniqueid);
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		return;
	}

	 /* revalidate if mtime or size have changed */
	if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
	    cifs_i->server_eof == fattr->cf_eof) {
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		cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
			 __func__, cifs_i->uniqueid);
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		return;
	}

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	cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
		 __func__, cifs_i->uniqueid);
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	set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
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}

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/*
 * copy nlink to the inode, unless it wasn't provided.  Provide
 * sane values if we don't have an existing one and none was provided
 */
static void
cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
	/*
	 * if we're in a situation where we can't trust what we
	 * got from the server (readdir, some non-unix cases)
	 * fake reasonable values
	 */
	if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
		/* only provide fake values on a new inode */
		if (inode->i_state & I_NEW) {
			if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
				set_nlink(inode, 2);
			else
				set_nlink(inode, 1);
		}
		return;
	}

	/* we trust the server, so update it */
	set_nlink(inode, fattr->cf_nlink);
}

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/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
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{
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	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
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	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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	cifs_revalidate_cache(inode, fattr);

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	spin_lock(&inode->i_lock);
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	inode->i_atime = fattr->cf_atime;
	inode->i_mtime = fattr->cf_mtime;
	inode->i_ctime = fattr->cf_ctime;
	inode->i_rdev = fattr->cf_rdev;
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	cifs_nlink_fattr_to_inode(inode, fattr);
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	inode->i_uid = fattr->cf_uid;
	inode->i_gid = fattr->cf_gid;

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	/* if dynperm is set, don't clobber existing mode */
	if (inode->i_state & I_NEW ||
	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
		inode->i_mode = fattr->cf_mode;

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	cifs_i->cifsAttrs = fattr->cf_cifsattrs;
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	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
		cifs_i->time = 0;
	else
		cifs_i->time = jiffies;

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	if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
		set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
	else
		clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
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	cifs_i->server_eof = fattr->cf_eof;
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	/*
	 * Can't safely change the file size here if the client is writing to
	 * it due to potential races.
	 */
	if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
		i_size_write(inode, fattr->cf_eof);

		/*
		 * i_blocks is not related to (i_size / i_blksize),
		 * but instead 512 byte (2**9) size is required for
		 * calculating num blocks.
		 */
		inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
	}
	spin_unlock(&inode->i_lock);

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	if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
		inode->i_flags |= S_AUTOMOUNT;
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	if (inode->i_state & I_NEW)
		cifs_set_ops(inode);
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}

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void
cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		return;

	fattr->cf_uniqueid = iunique(sb, ROOT_I);
}

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/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
			 struct cifs_sb_info *cifs_sb)
{
	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
	fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
	fattr->cf_eof = le64_to_cpu(info->EndOfFile);

	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
	fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
	fattr->cf_mode = le64_to_cpu(info->Permissions);
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	/*
	 * Since we set the inode type below we need to mask off
	 * to avoid strange results if bits set above.
	 */
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	fattr->cf_mode &= ~S_IFMT;
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	switch (le32_to_cpu(info->Type)) {
	case UNIX_FILE:
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		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		break;
	case UNIX_SYMLINK:
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		fattr->cf_mode |= S_IFLNK;
		fattr->cf_dtype = DT_LNK;
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		break;
	case UNIX_DIR:
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		fattr->cf_mode |= S_IFDIR;
		fattr->cf_dtype = DT_DIR;
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		break;
	case UNIX_CHARDEV:
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		fattr->cf_mode |= S_IFCHR;
		fattr->cf_dtype = DT_CHR;
		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
				       le64_to_cpu(info->DevMinor) & MINORMASK);
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		break;
	case UNIX_BLOCKDEV:
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		fattr->cf_mode |= S_IFBLK;
		fattr->cf_dtype = DT_BLK;
		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
				       le64_to_cpu(info->DevMinor) & MINORMASK);
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		break;
	case UNIX_FIFO:
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		fattr->cf_mode |= S_IFIFO;
		fattr->cf_dtype = DT_FIFO;
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		break;
	case UNIX_SOCKET:
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		fattr->cf_mode |= S_IFSOCK;
		fattr->cf_dtype = DT_SOCK;
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		break;
	default:
		/* safest to call it a file if we do not know */
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		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
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		break;
	}

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	fattr->cf_uid = cifs_sb->mnt_uid;
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
		u64 id = le64_to_cpu(info->Uid);
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		if (id < ((uid_t)-1)) {
			kuid_t uid = make_kuid(&init_user_ns, id);
			if (uid_valid(uid))
				fattr->cf_uid = uid;
		}
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	}
	
	fattr->cf_gid = cifs_sb->mnt_gid;
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
		u64 id = le64_to_cpu(info->Gid);
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		if (id < ((gid_t)-1)) {
			kgid_t gid = make_kgid(&init_user_ns, id);
			if (gid_valid(gid))
				fattr->cf_gid = gid;
		}
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	}
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	fattr->cf_nlink = le64_to_cpu(info->Nlinks);
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}

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/*
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 * Fill a cifs_fattr struct with fake inode info.
 *
 * Needed to setup cifs_fattr data for the directory which is the
 * junction to the new submount (ie to setup the fake directory
 * which represents a DFS referral).
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 */
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static void
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cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
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{
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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	cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
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	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
	fattr->cf_uid = cifs_sb->mnt_uid;
	fattr->cf_gid = cifs_sb->mnt_gid;
	fattr->cf_atime = CURRENT_TIME;
	fattr->cf_ctime = CURRENT_TIME;
	fattr->cf_mtime = CURRENT_TIME;
	fattr->cf_nlink = 2;
	fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
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}

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static int
cifs_get_file_info_unix(struct file *filp)
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{
	int rc;
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	unsigned int xid;
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	FILE_UNIX_BASIC_INFO find_data;
	struct cifs_fattr fattr;
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	struct inode *inode = file_inode(filp);
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	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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	struct cifsFileInfo *cfile = filp->private_data;
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	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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	xid = get_xid();
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	rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
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	if (!rc) {
		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
	} else if (rc == -EREMOTE) {
		cifs_create_dfs_fattr(&fattr, inode->i_sb);
		rc = 0;
	}

	cifs_fattr_to_inode(inode, &fattr);
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	free_xid(xid);
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	return rc;
}

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int cifs_get_inode_info_unix(struct inode **pinode,
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			     const unsigned char *full_path,
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			     struct super_block *sb, unsigned int xid)
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{
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	int rc;
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	FILE_UNIX_BASIC_INFO find_data;
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	struct cifs_fattr fattr;
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	struct cifs_tcon *tcon;
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	struct tcon_link *tlink;
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

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	cifs_dbg(FYI, "Getting info on %s\n", full_path);
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);

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	/* could have done a find first instead but this returns more info */
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	rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
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				  cifs_sb->local_nls, cifs_remap(cifs_sb));
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	cifs_put_tlink(tlink);
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	if (!rc) {
		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
	} else if (rc == -EREMOTE) {
		cifs_create_dfs_fattr(&fattr, sb);
		rc = 0;
	} else {
		return rc;
	}
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	/* check for Minshall+French symlinks */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
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		int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
					     full_path);
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		if (tmprc)
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			cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
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	}

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	if (*pinode == NULL) {
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		/* get new inode */
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		cifs_fill_uniqueid(sb, &fattr);
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		*pinode = cifs_iget(sb, &fattr);
		if (!*pinode)
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			rc = -ENOMEM;
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	} else {
		/* we already have inode, update it */
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		/* if uniqueid is different, return error */
		if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
		    CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
			rc = -ESTALE;
			goto cgiiu_exit;
		}

		/* if filetype is different, return error */
		if (unlikely(((*pinode)->i_mode & S_IFMT) !=
		    (fattr.cf_mode & S_IFMT))) {
			rc = -ESTALE;
			goto cgiiu_exit;
		}

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		cifs_fattr_to_inode(*pinode, &fattr);
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	}
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cgiiu_exit:
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	return rc;
}

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static int
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cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
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	      struct cifs_sb_info *cifs_sb, unsigned int xid)
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{
	int rc;
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	__u32 oplock;
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	struct tcon_link *tlink;
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	struct cifs_tcon *tcon;
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	struct cifs_fid fid;
	struct cifs_open_parms oparms;
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	struct cifs_io_parms io_parms;
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	char buf[24];
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	unsigned int bytes_read;
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	char *pbuf;
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	int buf_type = CIFS_NO_BUFFER;
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	pbuf = buf;

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	fattr->cf_mode &= ~S_IFMT;

	if (fattr->cf_eof == 0) {
		fattr->cf_mode |= S_IFIFO;
		fattr->cf_dtype = DT_FIFO;
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		return 0;
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	} else if (fattr->cf_eof < 8) {
		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		return -EINVAL;	 /* EOPNOTSUPP? */
	}
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);

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	oparms.tcon = tcon;
	oparms.cifs_sb = cifs_sb;
	oparms.desired_access = GENERIC_READ;
	oparms.create_options = CREATE_NOT_DIR;
	oparms.disposition = FILE_OPEN;
	oparms.path = path;
	oparms.fid = &fid;
	oparms.reconnect = false;

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	if (tcon->ses->server->oplocks)
		oplock = REQ_OPLOCK;
	else
		oplock = 0;
	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
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	if (rc) {
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		cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
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		cifs_put_tlink(tlink);
		return rc;
	}

	/* Read header */
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	io_parms.netfid = fid.netfid;
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	io_parms.pid = current->tgid;
	io_parms.tcon = tcon;
	io_parms.offset = 0;
	io_parms.length = 24;

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	rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
					&bytes_read, &pbuf, &buf_type);
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	if ((rc == 0) && (bytes_read >= 8)) {
		if (memcmp("IntxBLK", pbuf, 8) == 0) {
			cifs_dbg(FYI, "Block device\n");
			fattr->cf_mode |= S_IFBLK;
			fattr->cf_dtype = DT_BLK;
			if (bytes_read == 24) {
				/* we have enough to decode dev num */
				__u64 mjr; /* major */
				__u64 mnr; /* minor */
				mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
				mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
				fattr->cf_rdev = MKDEV(mjr, mnr);
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			}
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		} else if (memcmp("IntxCHR", pbuf, 8) == 0) {
			cifs_dbg(FYI, "Char device\n");
			fattr->cf_mode |= S_IFCHR;
			fattr->cf_dtype = DT_CHR;
			if (bytes_read == 24) {
				/* we have enough to decode dev num */
				__u64 mjr; /* major */
				__u64 mnr; /* minor */
				mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
				mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
				fattr->cf_rdev = MKDEV(mjr, mnr);
			}
		} else if (memcmp("IntxLNK", pbuf, 7) == 0) {
			cifs_dbg(FYI, "Symlink\n");
			fattr->cf_mode |= S_IFLNK;
			fattr->cf_dtype = DT_LNK;
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		} else {
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			fattr->cf_mode |= S_IFREG; /* file? */
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			fattr->cf_dtype = DT_REG;
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			rc = -EOPNOTSUPP;
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		}
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	} else {
		fattr->cf_mode |= S_IFREG; /* then it is a file */
		fattr->cf_dtype = DT_REG;
		rc = -EOPNOTSUPP; /* or some unknown SFU type */
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	}
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	tcon->ses->server->ops->close(xid, tcon, &fid);
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	cifs_put_tlink(tlink);
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	return rc;
}

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#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */

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/*
 * Fetch mode bits as provided by SFU.
 *
 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 */
static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
543
			 struct cifs_sb_info *cifs_sb, unsigned int xid)
544
{
545
#ifdef CONFIG_CIFS_XATTR
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	ssize_t rc;
	char ea_value[4];
	__u32 mode;
549
	struct tcon_link *tlink;
550
	struct cifs_tcon *tcon;
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);
556

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	if (tcon->ses->server->ops->query_all_EAs == NULL) {
		cifs_put_tlink(tlink);
		return -EOPNOTSUPP;
	}

	rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
			"SETFILEBITS", ea_value, 4 /* size of buf */,
			cifs_sb->local_nls,
565
			cifs_remap(cifs_sb));
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	cifs_put_tlink(tlink);
567
	if (rc < 0)
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		return (int)rc;
	else if (rc > 3) {
		mode = le32_to_cpu(*((__le32 *)ea_value));
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		fattr->cf_mode &= ~SFBITS_MASK;
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		cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
			 mode, fattr->cf_mode);
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		fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
575
		cifs_dbg(FYI, "special mode bits 0%o\n", mode);
576
	}
577 578

	return 0;
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#else
	return -EOPNOTSUPP;
#endif
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}

584
/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
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585
static void
586
cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
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		       struct cifs_sb_info *cifs_sb, bool adjust_tz,
		       bool symlink)
589
{
590
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
591

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	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
	if (info->DeletePending)
		fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;

	if (info->LastAccessTime)
		fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
	else
		fattr->cf_atime = CURRENT_TIME;

	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);

	if (adjust_tz) {
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		fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
		fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
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	}

	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
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	fattr->cf_createtime = le64_to_cpu(info->CreationTime);
613

614
	fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
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	if (symlink) {
		fattr->cf_mode = S_IFLNK;
		fattr->cf_dtype = DT_LNK;
	} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
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		fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
		fattr->cf_dtype = DT_DIR;
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		/*
		 * Server can return wrong NumberOfLinks value for directories
		 * when Unix extensions are disabled - fake it.
		 */
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		if (!tcon->unix_ext)
			fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
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	} else {
		fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
		fattr->cf_dtype = DT_REG;

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		/* clear write bits if ATTR_READONLY is set */
		if (fattr->cf_cifsattrs & ATTR_READONLY)
			fattr->cf_mode &= ~(S_IWUGO);
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		/*
		 * Don't accept zero nlink from non-unix servers unless
		 * delete is pending.  Instead mark it as unknown.
		 */
		if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
		    !info->DeletePending) {
			cifs_dbg(1, "bogus file nlink value %u\n",
643
				fattr->cf_nlink);
644
			fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
645
		}
646
	}
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	fattr->cf_uid = cifs_sb->mnt_uid;
	fattr->cf_gid = cifs_sb->mnt_gid;
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}

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static int
cifs_get_file_info(struct file *filp)
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{
	int rc;
656
	unsigned int xid;
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	FILE_ALL_INFO find_data;
	struct cifs_fattr fattr;
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	struct inode *inode = file_inode(filp);
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	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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	struct cifsFileInfo *cfile = filp->private_data;
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	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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	struct TCP_Server_Info *server = tcon->ses->server;

	if (!server->ops->query_file_info)
		return -ENOSYS;
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667

668
	xid = get_xid();
669
	rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
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	switch (rc) {
	case 0:
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		cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false,
				       false);
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		break;
	case -EREMOTE:
		cifs_create_dfs_fattr(&fattr, inode->i_sb);
		rc = 0;
		break;
	case -EOPNOTSUPP:
	case -EINVAL:
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		/*
		 * FIXME: legacy server -- fall back to path-based call?
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		 * for now, just skip revalidating and mark inode for
		 * immediate reval.
		 */
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		rc = 0;
		CIFS_I(inode)->time = 0;
688
	default:
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		goto cgfi_exit;
690
	}
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	/*
	 * don't bother with SFU junk here -- just mark inode as needing
	 * revalidation.
	 */
	fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
	fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
	cifs_fattr_to_inode(inode, &fattr);
cgfi_exit:
700
	free_xid(xid);
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	return rc;
}

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int
cifs_get_inode_info(struct inode **inode, const char *full_path,
		    FILE_ALL_INFO *data, struct super_block *sb, int xid,
707
		    const struct cifs_fid *fid)
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{
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	bool validinum = false;
	__u16 srchflgs;
	int rc = 0, tmprc = ENOSYS;
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	struct cifs_tcon *tcon;
	struct TCP_Server_Info *server;
714
	struct tcon_link *tlink;
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *buf = NULL;
717
	bool adjust_tz = false;
718
	struct cifs_fattr fattr;
719
	struct cifs_search_info *srchinf = NULL;
720
	bool symlink = false;
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
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	tcon = tlink_tcon(tlink);
	server = tcon->ses->server;
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728
	cifs_dbg(FYI, "Getting info on %s\n", full_path);
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730
	if ((data == NULL) && (*inode != NULL)) {
731
		if (CIFS_CACHE_READ(CIFS_I(*inode))) {
732
			cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
733
			goto cgii_exit;
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		}
	}

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	/* if inode info is not passed, get it from server */
	if (data == NULL) {
		if (!server->ops->query_path_info) {
			rc = -ENOSYS;
			goto cgii_exit;
		}
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		buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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		if (buf == NULL) {
			rc = -ENOMEM;
			goto cgii_exit;
		}
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		data = (FILE_ALL_INFO *)buf;
		rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
750
						  data, &adjust_tz, &symlink);
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	}
752 753

	if (!rc) {
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		cifs_all_info_to_fattr(&fattr, data, cifs_sb, adjust_tz,
				       symlink);
756 757
	} else if (rc == -EREMOTE) {
		cifs_create_dfs_fattr(&fattr, sb);
758
		rc = 0;
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	} else if (rc == -EACCES && backup_cred(cifs_sb)) {
			srchinf = kzalloc(sizeof(struct cifs_search_info),
						GFP_KERNEL);
			if (srchinf == NULL) {
				rc = -ENOMEM;
				goto cgii_exit;
			}

			srchinf->endOfSearch = false;
			srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;

			srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
					CIFS_SEARCH_CLOSE_AT_END |
					CIFS_SEARCH_BACKUP_SEARCH;

			rc = CIFSFindFirst(xid, tcon, full_path,
				cifs_sb, NULL, srchflgs, srchinf, false);
			if (!rc) {
				data =
				(FILE_ALL_INFO *)srchinf->srch_entries_start;

				cifs_dir_info_to_fattr(&fattr,
				(FILE_DIRECTORY_INFO *)data, cifs_sb);
				fattr.cf_uniqueid = le64_to_cpu(
				((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
				validinum = true;

				cifs_buf_release(srchinf->ntwrk_buf_start);
			}
			kfree(srchinf);
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			if (rc)
				goto cgii_exit;
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	} else
792
		goto cgii_exit;
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794 795 796 797 798 799 800
	/*
	 * If an inode wasn't passed in, then get the inode number
	 *
	 * Is an i_ino of zero legal? Can we use that to check if the server
	 * supports returning inode numbers?  Are there other sanity checks we
	 * can use to ensure that the server is really filling in that field?
	 */
801
	if (*inode == NULL) {
802
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
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			if (validinum == false) {
				if (server->ops->get_srv_inum)
					tmprc = server->ops->get_srv_inum(xid,
						tcon, cifs_sb, full_path,
						&fattr.cf_uniqueid, data);
				if (tmprc) {
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					cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
						 tmprc);
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					fattr.cf_uniqueid = iunique(sb, ROOT_I);
					cifs_autodisable_serverino(cifs_sb);
				}
814
			}
815
		} else
816
			fattr.cf_uniqueid = iunique(sb, ROOT_I);
817
	} else
818
		fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
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	/* query for SFU type info if supported and needed */
	if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
	    cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
		tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
		if (tmprc)
825
			cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
826
	}
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827

828
#ifdef CONFIG_CIFS_ACL
829 830
	/* fill in 0777 bits from ACL */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
831
		rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
832
		if (rc) {
833 834
			cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
				 __func__, rc);
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			goto cgii_exit;
		}
837
	}
838
#endif /* CONFIG_CIFS_ACL */
839

840 841 842
	/* fill in remaining high mode bits e.g. SUID, VTX */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
		cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
843

844 845
	/* check for Minshall+French symlinks */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
846 847
		tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
					 full_path);
848
		if (tmprc)
849
			cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
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	}

852 853 854
	if (!*inode) {
		*inode = cifs_iget(sb, &fattr);
		if (!*inode)
855 856
			rc = -ENOMEM;
	} else {
857 858 859 860 861 862 863 864 865
		/* we already have inode, update it */

		/* if filetype is different, return error */
		if (unlikely(((*inode)->i_mode & S_IFMT) !=
		    (fattr.cf_mode & S_IFMT))) {
			rc = -ESTALE;
			goto cgii_exit;
		}

866
		cifs_fattr_to_inode(*inode, &fattr);
867
	}
868

869
cgii_exit:
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	kfree(buf);
871
	cifs_put_tlink(tlink);
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	return rc;
}

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static const struct inode_operations cifs_ipc_inode_ops = {
	.lookup = cifs_lookup,
};

879 880 881 882 883
static int
cifs_find_inode(struct inode *inode, void *opaque)
{
	struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;

884
	/* don't match inode with different uniqueid */
885 886 887
	if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
		return 0;

888 889 890 891
	/* use createtime like an i_generation field */
	if (CIFS_I(inode)->createtime != fattr->cf_createtime)
		return 0;

892 893 894 895
	/* don't match inode of different type */
	if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
		return 0;

896
	/* if it's not a directory or has no dentries, then flag it */
897
	if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
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		fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;

900 901 902 903 904 905 906 907 908
	return 1;
}

static int
cifs_init_inode(struct inode *inode, void *opaque)
{
	struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;

	CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
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	CIFS_I(inode)->createtime = fattr->cf_createtime;
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	return 0;
}

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/*
 * walk dentry list for an inode and report whether it has aliases that
 * are hashed. We use this to determine if a directory inode can actually
 * be used.
 */
static bool
inode_has_hashed_dentries(struct inode *inode)
{
	struct dentry *dentry;

923
	spin_lock(&inode->i_lock);
924
	hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
925
		if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
926
			spin_unlock(&inode->i_lock);
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			return true;
		}
	}
930
	spin_unlock(&inode->i_lock);
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	return false;
}

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/* Given fattrs, get a corresponding inode */
struct inode *
cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
{
	unsigned long hash;
	struct inode *inode;

941
retry_iget5_locked:
942
	cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
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	/* hash down to 32-bits on 32-bit arch */
	hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);

	inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
	if (inode) {
949
		/* was there a potentially problematic inode collision? */
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		if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
			fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
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			if (inode_has_hashed_dentries(inode)) {
				cifs_autodisable_serverino(CIFS_SB(sb));
				iput(inode);
				fattr->cf_uniqueid = iunique(sb, ROOT_I);
				goto retry_iget5_locked;
			}
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		}

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		cifs_fattr_to_inode(inode, fattr);
		if (sb->s_flags & MS_NOATIME)
			inode->i_flags |= S_NOATIME | S_NOCMTIME;
		if (inode->i_state & I_NEW) {
			inode->i_ino = hash;
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#ifdef CONFIG_CIFS_FSCACHE
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			/* initialize per-inode cache cookie pointer */
			CIFS_I(inode)->fscache = NULL;
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#endif
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			unlock_new_inode(inode);
		}
	}

	return inode;
}

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/* gets root inode */
978
struct inode *cifs_root_iget(struct super_block *sb)
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{
980
	unsigned int xid;
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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	struct inode *inode = NULL;
983
	long rc;
984
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
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986
	xid = get_xid();
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	if (tcon->unix_ext) {
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		rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
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		/* some servers mistakenly claim POSIX support */
		if (rc != -EOPNOTSUPP)
			goto iget_no_retry;
		cifs_dbg(VFS, "server does not support POSIX extensions");
		tcon->unix_ext = false;
	}

	rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
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iget_no_retry:
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	if (!inode) {
		inode = ERR_PTR(rc);
		goto out;
	}
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#ifdef CONFIG_CIFS_FSCACHE
1005
	/* populate tcon->resource_id */
1006
	tcon->resource_id = CIFS_I(inode)->uniqueid;
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#endif
1008

1009
	if (rc && tcon->ipc) {
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		cifs_dbg(FYI, "ipc connection - fake read inode\n");
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		spin_lock(&inode->i_lock);
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		inode->i_mode |= S_IFDIR;
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		set_nlink(inode, 2);
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		inode->i_op = &cifs_ipc_inode_ops;
		inode->i_fop = &simple_dir_operations;
		inode->i_uid = cifs_sb->mnt_uid;
		inode->i_gid = cifs_sb->mnt_gid;
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		spin_unlock(&inode->i_lock);
1019
	} else if (rc) {
1020
		iget_failed(inode);
1021
		inode = ERR_PTR(rc);
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	}

1024
out:
1025
	/* can not call macro free_xid here since in a void func
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	 * TODO: This is no longer true
	 */
1028
	_free_xid(xid);
1029
	return inode;
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}

1032
int
1033
cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1034
		   char *full_path, __u32 dosattr)
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{
	bool set_time = false;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1038
	struct TCP_Server_Info *server;
1039 1040
	FILE_BASIC_INFO	info_buf;

1041 1042 1043
	if (attrs == NULL)
		return -EINVAL;

1044 1045 1046 1047
	server = cifs_sb_master_tcon(cifs_sb)->ses->server;
	if (!server->ops->set_file_info)
		return -ENOSYS;

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	if (attrs->ia_valid & ATTR_ATIME) {
		set_time = true;
		info_buf.LastAccessTime =
			cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
	} else
		info_buf.LastAccessTime = 0;

	if (attrs->ia_valid & ATTR_MTIME) {
		set_time = true;
		info_buf.LastWriteTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
	} else
		info_buf.LastWriteTime = 0;

	/*
	 * Samba throws this field away, but windows may actually use it.
	 * Do not set ctime unless other time stamps are changed explicitly
	 * (i.e. by utimes()) since we would then have a mix of client and
	 * server times.
	 */
	if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1069
		cifs_dbg(FYI, "CIFS - CTIME changed\n");
1070 1071 1072 1073 1074 1075 1076 1077
		info_buf.ChangeTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
	} else
		info_buf.ChangeTime = 0;

	info_buf.CreationTime = 0;	/* don't change */
	info_buf.Attributes = cpu_to_le32(dosattr);

1078
	return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1079 1080
}

1081
/*
1082
 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1083 1084 1085
 * and rename it to a random name that hopefully won't conflict with
 * anything else.
 */
1086 1087 1088
int
cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
			   const unsigned int xid)
1089 1090 1091
{
	int oplock = 0;
	int rc;
1092 1093
	struct cifs_fid fid;
	struct cifs_open_parms oparms;
1094
	struct inode *inode = d_inode(dentry);
1095 1096
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1097
	struct tcon_link *tlink;
1098
	struct cifs_tcon *tcon;
1099 1100
	__u32 dosattr, origattr;
	FILE_BASIC_INFO *info_buf = NULL;
1101

1102 1103 1104 1105 1106
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);

1107 1108 1109 1110 1111 1112 1113 1114 1115
	/*
	 * We cannot rename the file if the server doesn't support
	 * CAP_INFOLEVEL_PASSTHRU
	 */
	if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
		rc = -EBUSY;
		goto out;
	}

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
	oparms.tcon = tcon;
	oparms.cifs_sb = cifs_sb;
	oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
	oparms.create_options = CREATE_NOT_DIR;
	oparms.disposition = FILE_OPEN;
	oparms.path = full_path;
	oparms.fid = &fid;
	oparms.reconnect = false;

	rc = CIFS_open(xid, &oparms, &oplock, NULL);
1126 1127 1128
	if (rc != 0)
		goto out;

1129 1130 1131 1132 1133
	origattr = cifsInode->cifsAttrs;
	if (origattr == 0)
		origattr |= ATTR_NORMAL;

	dosattr = origattr & ~ATTR_READONLY;
1134 1135 1136 1137
	if (dosattr == 0)
		dosattr |= ATTR_NORMAL;
	dosattr |= ATTR_HIDDEN;

1138 1139 1140 1141 1142 1143 1144 1145
	/* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
	if (dosattr != origattr) {
		info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
		if (info_buf == NULL) {
			rc = -ENOMEM;
			goto out_close;
		}
		info_buf->Attributes = cpu_to_le32(dosattr);
1146
		rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1147 1148 1149
					current->tgid);
		/* although we would like to mark the file hidden
 		   if that fails we will still try to rename it */
1150
		if (!rc)
1151 1152 1153
			cifsInode->cifsAttrs = dosattr;
		else
			dosattr = origattr; /* since not able to change them */
1154 1155
	}

1156
	/* rename the file */
1157 1158
	rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
				   cifs_sb->local_nls,
1159
				   cifs_remap(cifs_sb));
1160
	if (rc != 0) {
1161
		rc = -EBUSY;
1162 1163
		goto undo_setattr;
	}
1164

1165
	/* try to set DELETE_ON_CLOSE */
1166
	if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1167
		rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
					       current->tgid);
		/*
		 * some samba versions return -ENOENT when we try to set the
		 * file disposition here. Likely a samba bug, but work around
		 * it for now. This means that some cifsXXX files may hang
		 * around after they shouldn't.
		 *
		 * BB: remove this hack after more servers have the fix
		 */
		if (rc == -ENOENT)
			rc = 0;
		else if (rc != 0) {
1180
			rc = -EBUSY;
1181 1182
			goto undo_rename;
		}
1183
		set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1184
	}
1185

1186
out_close:
1187
	CIFSSMBClose(xid, tcon, fid.netfid);
1188
out:
1189
	kfree(info_buf);
1190
	cifs_put_tlink(tlink);
1191
	return rc;
1192 1193 1194 1195 1196 1197 1198

	/*
	 * reset everything back to the original state. Don't bother
	 * dealing with errors here since we can't do anything about
	 * them anyway.
	 */
undo_rename:
1199
	CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1200
				cifs_sb->local_nls, cifs_remap(cifs_sb));
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undo_setattr:
	if (dosattr != origattr) {
		info_buf->Attributes = cpu_to_le32(origattr);
1204
		if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1205 1206 1207 1208 1209
					current->tgid))
			cifsInode->cifsAttrs = origattr;
	}

	goto out_close;
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}

1212 1213 1214 1215 1216 1217 1218 1219 1220
/* copied from fs/nfs/dir.c with small changes */
static void
cifs_drop_nlink(struct inode *inode)
{
	spin_lock(&inode->i_lock);
	if (inode->i_nlink > 0)
		drop_nlink(inode);
	spin_unlock(&inode->i_lock);
}
1221 1222

/*
1223
 * If d_inode(dentry) is null (usually meaning the cached dentry
1224
 * is a negative dentry) then we would attempt a standard SMB delete, but
1225 1226
 * if that fails we can not attempt the fall back mechanisms on EACCESS
 * but will return the EACCESS to the caller. Note that the VFS does not call
1227 1228
 * unlink on negative dentries currently.
 */
1229
int cifs_unlink(struct inode *dir, struct dentry *dentry)
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{
	int rc = 0;
1232
	unsigned int xid;
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	char *full_path = NULL;
1234
	struct inode *inode = d_inode(dentry);
1235
	struct cifsInodeInfo *cifs_inode;
1236 1237
	struct super_block *sb = dir->i_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1238
	struct tcon_link *tlink;
1239
	struct cifs_tcon *tcon;
1240
	struct TCP_Server_Info *server;
1241 1242
	struct iattr *attrs = NULL;
	__u32 dosattr = 0, origattr = 0;
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1244
	cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
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1246 1247 1248 1249
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);
1250
	server = tcon->ses->server;
1251

1252
	xid = get_xid();
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1254 1255 1256
	/* Unlink can be called from rename so we can not take the
	 * sb->s_vfs_rename_mutex here */
	full_path = build_path_from_dentry(dentry);
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	if (full_path == NULL) {
1258
		rc = -ENOMEM;
1259
		goto unlink_out;
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	}
1261

1262 1263
	if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
				le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1264
		rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1265
			SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1266
			cifs_remap(cifs_sb));
1267
		cifs_dbg(FYI, "posix del rc %d\n", rc);
1268 1269 1270
		if ((rc == 0) || (rc == -ENOENT))
			goto psx_del_no_retry;
	}
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1271

1272
retry_std_delete:
1273 1274 1275 1276 1277 1278
	if (!server->ops->unlink) {
		rc = -ENOSYS;
		goto psx_del_no_retry;
	}

	rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1279

1280
psx_del_no_retry:
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	if (!rc) {
1282
		if (inode)
1283
			cifs_drop_nlink(inode);
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1284
	} else if (rc == -ENOENT) {
1285
		d_drop(dentry);
1286
	} else if (rc == -EBUSY) {
1287 1288 1289 1290 1291 1292
		if (server->ops->rename_pending_delete) {
			rc = server->ops->rename_pending_delete(full_path,
								dentry, xid);
			if (rc == 0)
				cifs_drop_nlink(inode);
		}
1293
	} else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1294 1295 1296 1297
		attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
		if (attrs == NULL) {
			rc = -ENOMEM;
			goto out_reval;
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1298
		}
1299 1300

		/* try to reset dos attributes */
1301 1302
		cifs_inode = CIFS_I(inode);
		origattr = cifs_inode->cifsAttrs;
1303 1304 1305
		if (origattr == 0)
			origattr |= ATTR_NORMAL;
		dosattr = origattr & ~ATTR_READONLY;
1306 1307 1308 1309 1310 1311 1312
		if (dosattr == 0)
			dosattr |= ATTR_NORMAL;
		dosattr |= ATTR_HIDDEN;

		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
		if (rc != 0)
			goto out_reval;
1313 1314

		goto retry_std_delete;
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	}
1316 1317 1318 1319 1320

	/* undo the setattr if we errored out and it's needed */
	if (rc != 0 && dosattr != 0)
		cifs_set_file_info(inode, attrs, xid, full_path, origattr);

1321
out_reval:
1322
	if (inode) {
1323 1324
		cifs_inode = CIFS_I(inode);
		cifs_inode->time = 0;	/* will force revalidate to get info
1325 1326
					   when needed */
		inode->i_ctime = current_fs_time(sb);
1327
	}
1328
	dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1329
	cifs_inode = CIFS_I(dir);
1330
	CIFS_I(dir)->time = 0;	/* force revalidate of dir as well */
1331
unlink_out:
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1332
	kfree(full_path);
1333
	kfree(attrs);
1334
	free_xid(xid);
1335
	cifs_put_tlink(tlink);
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1336 1337 1338
	return rc;
}

1339
static int
1340
cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1341 1342 1343 1344
		 const char *full_path, struct cifs_sb_info *cifs_sb,
		 struct cifs_tcon *tcon, const unsigned int xid)
{
	int rc = 0;
1345
	struct inode *inode = NULL;
1346 1347

	if (tcon->unix_ext)
1348
		rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1349 1350
					      xid);
	else
1351 1352 1353
		rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
					 xid, NULL);

1354 1355 1356 1357 1358
	if (rc)
		return rc;

	/*
	 * setting nlink not necessary except in cases where we failed to get it
1359 1360
	 * from the server or was set bogus. Also, since this is a brand new
	 * inode, no need to grab the i_lock before setting the i_nlink.
1361
	 */
1362 1363
	if (inode->i_nlink < 2)
		set_nlink(inode, 2);
1364 1365
	mode &= ~current_umask();
	/* must turn on setgid bit if parent dir has it */
1366
	if (parent->i_mode & S_ISGID)
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
		mode |= S_ISGID;

	if (tcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode,
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= 0,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1378
			args.uid = current_fsuid();
1379
			if (parent->i_mode & S_ISGID)
1380
				args.gid = parent->i_gid;
1381
			else
1382
				args.gid = current_fsgid();
1383
		} else {
1384 1385
			args.uid = INVALID_UID; /* no change */
			args.gid = INVALID_GID; /* no change */
1386 1387 1388
		}
		CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
				       cifs_sb->local_nls,
1389
				       cifs_remap(cifs_sb));
1390
	} else {
1391
		struct TCP_Server_Info *server = tcon->ses->server;
1392
		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1393
		    (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1394
			server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1395
						   tcon, xid);
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		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
			inode->i_mode = (mode | S_IFDIR);

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			inode->i_uid = current_fsuid();
			if (inode->i_mode & S_ISGID)
				inode->i_gid = parent->i_gid;
			else
				inode->i_gid = current_fsgid();
1405 1406
		}
	}
1407
	d_instantiate(dentry, inode);
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	return rc;
}

static int
cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
		 const char *full_path, struct cifs_sb_info *cifs_sb,
		 struct cifs_tcon *tcon, const unsigned int xid)
{
	int rc = 0;
	u32 oplock = 0;
	FILE_UNIX_BASIC_INFO *info = NULL;
	struct inode *newinode = NULL;
	struct cifs_fattr fattr;

	info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
	if (info == NULL) {
		rc = -ENOMEM;
		goto posix_mkdir_out;
	}

	mode &= ~current_umask();
	rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
			     NULL /* netfid */, info, &oplock, full_path,
1431
			     cifs_sb->local_nls, cifs_remap(cifs_sb));
1432 1433 1434
	if (rc == -EOPNOTSUPP)
		goto posix_mkdir_out;
	else if (rc) {
1435
		cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456
		d_drop(dentry);
		goto posix_mkdir_out;
	}

	if (info->Type == cpu_to_le32(-1))
		/* no return info, go query for it */
		goto posix_mkdir_get_info;
	/*
	 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
	 * need to set uid/gid.
	 */

	cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
	cifs_fill_uniqueid(inode->i_sb, &fattr);
	newinode = cifs_iget(inode->i_sb, &fattr);
	if (!newinode)
		goto posix_mkdir_get_info;

	d_instantiate(dentry, newinode);

#ifdef CONFIG_CIFS_DEBUG2
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1457 1458
	cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
		 dentry, dentry, newinode);
1459 1460

	if (newinode->i_nlink != 2)
1461 1462
		cifs_dbg(FYI, "unexpected number of links %d\n",
			 newinode->i_nlink);
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
#endif

posix_mkdir_out:
	kfree(info);
	return rc;
posix_mkdir_get_info:
	rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
			      xid);
	goto posix_mkdir_out;
}

1474
int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
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{
1476
	int rc = 0;
1477
	unsigned int xid;
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	struct cifs_sb_info *cifs_sb;
1479
	struct tcon_link *tlink;
1480
	struct cifs_tcon *tcon;
1481
	struct TCP_Server_Info *server;
1482
	char *full_path;
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1483

1484 1485
	cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n",
		 mode, inode);
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	cifs_sb = CIFS_SB(inode->i_sb);
1488 1489 1490
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
1491
	tcon = tlink_tcon(tlink);
1492

1493
	xid = get_xid();
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1494

1495
	full_path = build_path_from_dentry(direntry);
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	if (full_path == NULL) {
1497
		rc = -ENOMEM;
1498
		goto mkdir_out;
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	}
1500

1501 1502
	if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
				le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1503 1504 1505
		rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
				      tcon, xid);
		if (rc != -EOPNOTSUPP)
1506
			goto mkdir_out;
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1507
	}
1508

1509 1510 1511 1512 1513 1514 1515
	server = tcon->ses->server;

	if (!server->ops->mkdir) {
		rc = -ENOSYS;
		goto mkdir_out;
	}

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	/* BB add setting the equivalent of mode via CreateX w/ACLs */
1517
	rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
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	if (rc) {
1519
		cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
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		d_drop(direntry);
1521
		goto mkdir_out;
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	}
1523 1524 1525

	rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
			      xid);
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mkdir_out:
1527 1528 1529 1530 1531
	/*
	 * Force revalidate to get parent dir info when needed since cached
	 * attributes are invalid now.
	 */
	CIFS_I(inode)->time = 0;
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1532
	kfree(full_path);
1533
	free_xid(xid);
1534
	cifs_put_tlink(tlink);
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	return rc;
}

int cifs_rmdir(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
1541
	unsigned int xid;
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	struct cifs_sb_info *cifs_sb;
1543
	struct tcon_link *tlink;
1544 1545
	struct cifs_tcon *tcon;
	struct TCP_Server_Info *server;
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	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;

1549
	cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
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1550

1551
	xid = get_xid();
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1552

1553
	full_path = build_path_from_dentry(direntry);
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	if (full_path == NULL) {
1555
		rc = -ENOMEM;
1556
		goto rmdir_exit;
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	}

1559 1560 1561 1562 1563 1564
	cifs_sb = CIFS_SB(inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		rc = PTR_ERR(tlink);
		goto rmdir_exit;
	}
1565 1566 1567 1568 1569 1570 1571 1572
	tcon = tlink_tcon(tlink);
	server = tcon->ses->server;

	if (!server->ops->rmdir) {
		rc = -ENOSYS;
		cifs_put_tlink(tlink);
		goto rmdir_exit;
	}
1573

1574
	rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1575
	cifs_put_tlink(tlink);
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	if (!rc) {
1578 1579 1580 1581
		spin_lock(&d_inode(direntry)->i_lock);
		i_size_write(d_inode(direntry), 0);
		clear_nlink(d_inode(direntry));
		spin_unlock(&d_inode(direntry)->i_lock);
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1582 1583
	}

1584
	cifsInode = CIFS_I(d_inode(direntry));
1585 1586
	/* force revalidate to go get info when needed */
	cifsInode->time = 0;
1587 1588

	cifsInode = CIFS_I(inode);
1589 1590 1591 1592 1593
	/*
	 * Force revalidate to get parent dir info when needed since cached
	 * attributes are invalid now.
	 */
	cifsInode->time = 0;
1594

1595
	d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
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1596 1597
		current_fs_time(inode->i_sb);

1598
rmdir_exit:
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1599
	kfree(full_path);
1600
	free_xid(xid);
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1601 1602 1603
	return rc;
}

1604
static int
1605 1606 1607
cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
	       const char *from_path, struct dentry *to_dentry,
	       const char *to_path)
1608 1609
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1610
	struct tcon_link *tlink;
1611 1612
	struct cifs_tcon *tcon;
	struct TCP_Server_Info *server;
1613 1614
	struct cifs_fid fid;
	struct cifs_open_parms oparms;
1615 1616
	int oplock, rc;

1617 1618 1619
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
1620 1621 1622 1623 1624
	tcon = tlink_tcon(tlink);
	server = tcon->ses->server;

	if (!server->ops->rename)
		return -ENOSYS;
1625

1626
	/* try path-based rename first */
1627
	rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1628 1629

	/*
1630 1631
	 * Don't bother with rename by filehandle unless file is busy and
	 * source. Note that cross directory moves do not work with
1632 1633
	 * rename by filehandle to various Windows servers.
	 */
1634
	if (rc == 0 || rc != -EBUSY)
1635
		goto do_rename_exit;
1636

1637 1638
	/* open-file renames don't work across directories */
	if (to_dentry->d_parent != from_dentry->d_parent)
1639
		goto do_rename_exit;
1640

1641 1642
	oparms.tcon = tcon;
	oparms.cifs_sb = cifs_sb;
1643
	/* open the file to be renamed -- we need DELETE perms */
1644 1645 1646 1647 1648 1649 1650 1651
	oparms.desired_access = DELETE;
	oparms.create_options = CREATE_NOT_DIR;
	oparms.disposition = FILE_OPEN;
	oparms.path = from_path;
	oparms.fid = &fid;
	oparms.reconnect = false;

	rc = CIFS_open(xid, &oparms, &oplock, NULL);
1652
	if (rc == 0) {
1653
		rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
1654
				(const char *) to_dentry->d_name.name,
1655
				cifs_sb->local_nls, cifs_remap(cifs_sb));
1656
		CIFSSMBClose(xid, tcon, fid.netfid);
1657
	}
1658 1659
do_rename_exit:
	cifs_put_tlink(tlink);
1660 1661 1662
	return rc;
}

1663
int
1664 1665 1666
cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
	     struct inode *target_dir, struct dentry *target_dentry,
	     unsigned int flags)
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{
1668 1669
	char *from_name = NULL;
	char *to_name = NULL;
1670
	struct cifs_sb_info *cifs_sb;
1671
	struct tcon_link *tlink;
1672
	struct cifs_tcon *tcon;
1673 1674
	FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
	FILE_UNIX_BASIC_INFO *info_buf_target;
1675 1676
	unsigned int xid;
	int rc, tmprc;
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1678 1679 1680
	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

1681
	cifs_sb = CIFS_SB(source_dir->i_sb);
1682 1683 1684 1685
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	tcon = tlink_tcon(tlink);
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1686

1687
	xid = get_xid();
1688 1689 1690 1691 1692

	/*
	 * we already have the rename sem so we do not need to
	 * grab it again here to protect the path integrity
	 */
1693 1694
	from_name = build_path_from_dentry(source_dentry);
	if (from_name == NULL) {
1695 1696 1697 1698
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

1699 1700
	to_name = build_path_from_dentry(target_dentry);
	if (to_name == NULL) {
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		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

1705 1706
	rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
			    to_name);
1707

1708 1709 1710 1711 1712 1713
	/*
	 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
	 */
	if (flags & RENAME_NOREPLACE)
		goto cifs_rename_exit;

1714 1715
	if (rc == -EEXIST && tcon->unix_ext) {
		/*
1716 1717
		 * Are src and dst hardlinks of same inode? We can only tell
		 * with unix extensions enabled.
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
		 */
		info_buf_source =
			kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
					GFP_KERNEL);
		if (info_buf_source == NULL) {
			rc = -ENOMEM;
			goto cifs_rename_exit;
		}

		info_buf_target = info_buf_source + 1;
1728 1729 1730
		tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
					     info_buf_source,
					     cifs_sb->local_nls,
1731
					     cifs_remap(cifs_sb));
1732
		if (tmprc != 0)
1733
			goto unlink_target;
1734

1735 1736 1737
		tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
					     info_buf_target,
					     cifs_sb->local_nls,
1738
					     cifs_remap(cifs_sb));
1739

1740
		if (tmprc == 0 && (info_buf_source->UniqueId ==
1741
				   info_buf_target->UniqueId)) {
1742
			/* same file, POSIX says that this is a noop */
1743
			rc = 0;
1744
			goto cifs_rename_exit;
1745
		}
1746 1747 1748 1749 1750
	}
	/*
	 * else ... BB we could add the same check for Windows by
	 * checking the UniqueId via FILE_INTERNAL_INFO
	 */
1751

1752
unlink_target:
1753
	/* Try unlinking the target dentry if it's not negative */
1754
	if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
1755 1756 1757 1758
		if (d_is_dir(target_dentry))
			tmprc = cifs_rmdir(target_dir, target_dentry);
		else
			tmprc = cifs_unlink(target_dir, target_dentry);
1759 1760
		if (tmprc)
			goto cifs_rename_exit;
1761 1762
		rc = cifs_do_rename(xid, source_dentry, from_name,
				    target_dentry, to_name);
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	}

1765 1766 1767 1768 1769 1770
	/* force revalidate to go get info when needed */
	CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;

	source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
		target_dir->i_mtime = current_fs_time(source_dir->i_sb);

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1771
cifs_rename_exit:
1772
	kfree(info_buf_source);
1773 1774
	kfree(from_name);
	kfree(to_name);
1775
	free_xid(xid);
1776
	cifs_put_tlink(tlink);
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	return rc;
}

1780 1781
static bool
cifs_inode_needs_reval(struct inode *inode)
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{
1783
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1784
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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1785

1786
	if (CIFS_CACHE_READ(cifs_i))
1787
		return false;
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1788

1789 1790
	if (!lookupCacheEnabled)
		return true;
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1791

1792 1793
	if (cifs_i->time == 0)
		return true;
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1795 1796 1797
	if (!cifs_sb->actimeo)
		return true;

1798 1799
	if (!time_in_range(jiffies, cifs_i->time,
				cifs_i->time + cifs_sb->actimeo))
1800 1801
		return true;

1802
	/* hardlinked files w/ noserverino get "special" treatment */
1803
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1804 1805 1806
	    S_ISREG(inode->i_mode) && inode->i_nlink != 1)
		return true;

1807 1808 1809
	return false;
}

1810 1811 1812
/*
 * Zap the cache. Called when invalid_mapping flag is set.
 */
1813
int
1814 1815
cifs_invalidate_mapping(struct inode *inode)
{
1816
	int rc = 0;
1817 1818

	if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1819
		rc = invalidate_inode_pages2(inode->i_mapping);
1820
		if (rc)
1821 1822
			cifs_dbg(VFS, "%s: could not invalidate inode %p\n",
				 __func__, inode);
1823
	}
1824

1825
	cifs_fscache_reset_inode_cookie(inode);
1826
	return rc;
1827 1828
}

1829 1830 1831 1832 1833
/**
 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
 * @word: long word containing the bit lock
 */
static int
1834
cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
1835 1836
{
	freezable_schedule_unsafe();
1837 1838
	if (signal_pending_state(mode, current))
		return -ERESTARTSYS;
1839 1840 1841
	return 0;
}

1842 1843 1844
int
cifs_revalidate_mapping(struct inode *inode)
{
1845 1846 1847
	int rc;
	unsigned long *flags = &CIFS_I(inode)->flags;

1848 1849
	rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
				     TASK_KILLABLE);
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859
	if (rc)
		return rc;

	if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
		rc = cifs_invalidate_mapping(inode);
		if (rc)
			set_bit(CIFS_INO_INVALID_MAPPING, flags);
	}

	clear_bit_unlock(CIFS_INO_LOCK, flags);
1860
	smp_mb__after_atomic();
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
	wake_up_bit(flags, CIFS_INO_LOCK);

	return rc;
}

int
cifs_zap_mapping(struct inode *inode)
{
	set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
	return cifs_revalidate_mapping(inode);
1871 1872
}

1873
int cifs_revalidate_file_attr(struct file *filp)
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1874 1875
{
	int rc = 0;
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	struct inode *inode = file_inode(filp);
1877
	struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
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1878 1879

	if (!cifs_inode_needs_reval(inode))
1880
		return rc;
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1881

1882
	if (tlink_tcon(cfile->tlink)->unix_ext)
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1883 1884 1885 1886 1887 1888 1889
		rc = cifs_get_file_info_unix(filp);
	else
		rc = cifs_get_file_info(filp);

	return rc;
}

1890
int cifs_revalidate_dentry_attr(struct dentry *dentry)
1891
{
1892
	unsigned int xid;
1893
	int rc = 0;
1894
	struct inode *inode = d_inode(dentry);
1895
	struct super_block *sb = dentry->d_sb;
1896
	char *full_path = NULL;
1897 1898 1899

	if (inode == NULL)
		return -ENOENT;
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1900

1901
	if (!cifs_inode_needs_reval(inode))
1902 1903
		return rc;

1904
	xid = get_xid();
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1905 1906 1907

	/* can not safely grab the rename sem here if rename calls revalidate
	   since that would deadlock */
1908
	full_path = build_path_from_dentry(dentry);
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1909
	if (full_path == NULL) {
1910
		rc = -ENOMEM;
1911
		goto out;
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1912 1913
	}

1914 1915
	cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
		 full_path, inode, inode->i_count.counter,
1916
		 dentry, dentry->d_time, jiffies);
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1917

1918
	if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1919 1920 1921 1922
		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
	else
		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
					 xid, NULL);
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1923

1924
out:
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1925
	kfree(full_path);
1926
	free_xid(xid);
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1927 1928 1929
	return rc;
}

1930 1931 1932
int cifs_revalidate_file(struct file *filp)
{
	int rc;
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1933
	struct inode *inode = file_inode(filp);
1934 1935 1936 1937 1938

	rc = cifs_revalidate_file_attr(filp);
	if (rc)
		return rc;

1939
	return cifs_revalidate_mapping(inode);
1940 1941 1942 1943 1944 1945
}

/* revalidate a dentry's inode attributes */
int cifs_revalidate_dentry(struct dentry *dentry)
{
	int rc;
1946
	struct inode *inode = d_inode(dentry);
1947 1948 1949 1950 1951

	rc = cifs_revalidate_dentry_attr(dentry);
	if (rc)
		return rc;

1952
	return cifs_revalidate_mapping(inode);
1953 1954
}

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1955
int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1956
		 struct kstat *stat)
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{
1958
	struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1959
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1960
	struct inode *inode = d_inode(dentry);
1961
	int rc;
1962

1963 1964 1965 1966
	/*
	 * We need to be sure that all dirty pages are written and the server
	 * has actual ctime, mtime and file length.
	 */
1967
	if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1968 1969
	    inode->i_mapping->nrpages != 0) {
		rc = filemap_fdatawait(inode->i_mapping);
1970 1971 1972 1973
		if (rc) {
			mapping_set_error(inode->i_mapping, rc);
			return rc;
		}
1974
	}
1975

1976 1977 1978 1979 1980 1981 1982 1983 1984
	rc = cifs_revalidate_dentry_attr(dentry);
	if (rc)
		return rc;

	generic_fillattr(inode, stat);
	stat->blksize = CIFS_MAX_MSGSIZE;
	stat->ino = CIFS_I(inode)->uniqueid;

	/*
1985 1986 1987
	 * If on a multiuser mount without unix extensions or cifsacl being
	 * enabled, and the admin hasn't overridden them, set the ownership
	 * to the fsuid/fsgid of the current process.
1988 1989
	 */
	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1990
	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1991 1992 1993 1994 1995
	    !tcon->unix_ext) {
		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
			stat->uid = current_fsuid();
		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
			stat->gid = current_fsgid();
1996
	}
1997
	return rc;
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}

static int cifs_truncate_page(struct address_space *mapping, loff_t from)
{
	pgoff_t index = from >> PAGE_CACHE_SHIFT;
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;
	int rc = 0;

	page = grab_cache_page(mapping, index);
	if (!page)
		return -ENOMEM;

2011
	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
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2012 2013 2014 2015 2016
	unlock_page(page);
	page_cache_release(page);
	return rc;
}

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2017
static void cifs_setsize(struct inode *inode, loff_t offset)
2018
{
2019
	spin_lock(&inode->i_lock);
2020
	i_size_write(inode, offset);
2021
	spin_unlock(&inode->i_lock);
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2022

2023
	truncate_pagecache(inode, offset);
2024 2025
}

2026 2027
static int
cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2028
		   unsigned int xid, char *full_path)
2029 2030 2031 2032 2033
{
	int rc;
	struct cifsFileInfo *open_file;
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2034
	struct tcon_link *tlink = NULL;
2035 2036
	struct cifs_tcon *tcon = NULL;
	struct TCP_Server_Info *server;
2037 2038 2039 2040 2041 2042 2043 2044 2045 2046

	/*
	 * To avoid spurious oplock breaks from server, in the case of
	 * inodes that we already have open, avoid doing path based
	 * setting of file size if we can do it by handle.
	 * This keeps our caching token (oplock) and avoids timeouts
	 * when the local oplock break takes longer to flush
	 * writebehind data than the SMB timeout for the SetPathInfo
	 * request would allow
	 */
2047
	open_file = find_writable_file(cifsInode, true);
2048
	if (open_file) {
2049 2050 2051 2052 2053 2054 2055
		tcon = tlink_tcon(open_file->tlink);
		server = tcon->ses->server;
		if (server->ops->set_file_size)
			rc = server->ops->set_file_size(xid, tcon, open_file,
							attrs->ia_size, false);
		else
			rc = -ENOSYS;
2056
		cifsFileInfo_put(open_file);
2057
		cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2058 2059 2060
	} else
		rc = -EINVAL;

2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
	if (!rc)
		goto set_size_out;

	if (tcon == NULL) {
		tlink = cifs_sb_tlink(cifs_sb);
		if (IS_ERR(tlink))
			return PTR_ERR(tlink);
		tcon = tlink_tcon(tlink);
		server = tcon->ses->server;
	}
2071

2072 2073 2074 2075 2076 2077 2078 2079 2080 2081
	/*
	 * Set file size by pathname rather than by handle either because no
	 * valid, writeable file handle for it was found or because there was
	 * an error setting it by handle.
	 */
	if (server->ops->set_path_size)
		rc = server->ops->set_path_size(xid, tcon, full_path,
						attrs->ia_size, cifs_sb, false);
	else
		rc = -ENOSYS;
2082
	cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2083 2084 2085

	if (tlink)
		cifs_put_tlink(tlink);
2086

2087
set_size_out:
2088
	if (rc == 0) {
2089
		cifsInode->server_eof = attrs->ia_size;
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2090
		cifs_setsize(inode, attrs->ia_size);
2091 2092 2093 2094 2095 2096
		cifs_truncate_page(inode->i_mapping, inode->i_size);
	}

	return rc;
}

2097 2098 2099 2100
static int
cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
	int rc;
2101
	unsigned int xid;
2102
	char *full_path = NULL;
2103
	struct inode *inode = d_inode(direntry);
2104 2105
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2106
	struct tcon_link *tlink;
2107
	struct cifs_tcon *pTcon;
2108
	struct cifs_unix_set_info_args *args = NULL;
2109
	struct cifsFileInfo *open_file;
2110

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	cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
		 direntry, attrs->ia_valid);
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2114
	xid = get_xid();
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	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
		attrs->ia_valid |= ATTR_FORCE;

	rc = inode_change_ok(inode, attrs);
	if (rc < 0)
		goto out;
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	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

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	/*
	 * Attempt to flush data before changing attributes. We need to do
	 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
	 * ownership or mode then we may also need to do this. Here, we take
	 * the safe way out and just do the flush on all setattr requests. If
	 * the flush returns error, store it to report later and continue.
	 *
	 * BB: This should be smarter. Why bother flushing pages that
	 * will be truncated anyway? Also, should we error out here if
	 * the flush returns error?
	 */
	rc = filemap_write_and_wait(inode->i_mapping);
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	mapping_set_error(inode->i_mapping, rc);
	rc = 0;
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	if (attrs->ia_valid & ATTR_SIZE) {
		rc = cifs_set_file_size(inode, attrs, xid, full_path);
		if (rc != 0)
			goto out;
	}

	/* skip mode change if it's just for clearing setuid/setgid */
	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
		attrs->ia_valid &= ~ATTR_MODE;

	args = kmalloc(sizeof(*args), GFP_KERNEL);
	if (args == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/* set up the struct */
	if (attrs->ia_valid & ATTR_MODE)
		args->mode = attrs->ia_mode;
	else
		args->mode = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_UID)
		args->uid = attrs->ia_uid;
	else
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		args->uid = INVALID_UID; /* no change */
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	if (attrs->ia_valid & ATTR_GID)
		args->gid = attrs->ia_gid;
	else
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		args->gid = INVALID_GID; /* no change */
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	if (attrs->ia_valid & ATTR_ATIME)
		args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
	else
		args->atime = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_MTIME)
		args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
	else
		args->mtime = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_CTIME)
		args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
	else
		args->ctime = NO_CHANGE_64;

	args->device = 0;
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	open_file = find_writable_file(cifsInode, true);
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	if (open_file) {
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		u16 nfid = open_file->fid.netfid;
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		u32 npid = open_file->pid;
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		pTcon = tlink_tcon(open_file->tlink);
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		rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
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		cifsFileInfo_put(open_file);
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	} else {
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		tlink = cifs_sb_tlink(cifs_sb);
		if (IS_ERR(tlink)) {
			rc = PTR_ERR(tlink);
			goto out;
		}
		pTcon = tlink_tcon(tlink);
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		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
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				    cifs_sb->local_nls,
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				    cifs_remap(cifs_sb));
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		cifs_put_tlink(tlink);
2210
	}
2211

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	if (rc)
		goto out;
2214

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	if ((attrs->ia_valid & ATTR_SIZE) &&
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	    attrs->ia_size != i_size_read(inode))
		truncate_setsize(inode, attrs->ia_size);
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	setattr_copy(inode, attrs);
	mark_inode_dirty(inode);

	/* force revalidate when any of these times are set since some
	   of the fs types (eg ext3, fat) do not have fine enough
	   time granularity to match protocol, and we do not have a
	   a way (yet) to query the server fs's time granularity (and
	   whether it rounds times down).
	*/
	if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
		cifsInode->time = 0;
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out:
	kfree(args);
	kfree(full_path);
2233
	free_xid(xid);
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	return rc;
}

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static int
cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
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{
2240
	unsigned int xid;
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	kuid_t uid = INVALID_UID;
	kgid_t gid = INVALID_GID;
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	struct inode *inode = d_inode(direntry);
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	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
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	char *full_path = NULL;
	int rc = -EACCES;
2248
	__u32 dosattr = 0;
2249
	__u64 mode = NO_CHANGE_64;
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2251
	xid = get_xid();
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2253 2254
	cifs_dbg(FYI, "setattr on file %pd attrs->iavalid 0x%x\n",
		 direntry, attrs->ia_valid);
2255

2256 2257 2258 2259 2260
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
		attrs->ia_valid |= ATTR_FORCE;

	rc = inode_change_ok(inode, attrs);
	if (rc < 0) {
2261
		free_xid(xid);
2262
		return rc;
2263
	}
2264

2265
	full_path = build_path_from_dentry(direntry);
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2266
	if (full_path == NULL) {
2267
		rc = -ENOMEM;
2268
		free_xid(xid);
2269
		return rc;
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	}

2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
	/*
	 * Attempt to flush data before changing attributes. We need to do
	 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
	 * ownership or mode then we may also need to do this. Here, we take
	 * the safe way out and just do the flush on all setattr requests. If
	 * the flush returns error, store it to report later and continue.
	 *
	 * BB: This should be smarter. Why bother flushing pages that
	 * will be truncated anyway? Also, should we error out here if
	 * the flush returns error?
	 */
	rc = filemap_write_and_wait(inode->i_mapping);
2284 2285
	mapping_set_error(inode->i_mapping, rc);
	rc = 0;
2286

2287
	if (attrs->ia_valid & ATTR_SIZE) {
2288 2289
		rc = cifs_set_file_size(inode, attrs, xid, full_path);
		if (rc != 0)
2290
			goto cifs_setattr_exit;
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2291
	}
2292

2293 2294 2295 2296 2297 2298 2299 2300
	if (attrs->ia_valid & ATTR_UID)
		uid = attrs->ia_uid;

	if (attrs->ia_valid & ATTR_GID)
		gid = attrs->ia_gid;

#ifdef CONFIG_CIFS_ACL
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2301
		if (uid_valid(uid) || gid_valid(gid)) {
2302 2303 2304
			rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
							uid, gid);
			if (rc) {
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				cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
					 __func__, rc);
2307 2308 2309 2310 2311
				goto cifs_setattr_exit;
			}
		}
	} else
#endif /* CONFIG_CIFS_ACL */
2312
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2313
		attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
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2315 2316 2317 2318
	/* skip mode change if it's just for clearing setuid/setgid */
	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
		attrs->ia_valid &= ~ATTR_MODE;

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	if (attrs->ia_valid & ATTR_MODE) {
		mode = attrs->ia_mode;
2321
		rc = 0;
2322
#ifdef CONFIG_CIFS_ACL
2323
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2324
			rc = id_mode_to_cifs_acl(inode, full_path, mode,
2325
						INVALID_UID, INVALID_GID);
2326
			if (rc) {
2327 2328
				cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
					 __func__, rc);
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				goto cifs_setattr_exit;
			}
		} else
2332
#endif /* CONFIG_CIFS_ACL */
2333 2334
		if (((mode & S_IWUGO) == 0) &&
		    (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2335 2336 2337

			dosattr = cifsInode->cifsAttrs | ATTR_READONLY;

2338 2339 2340 2341 2342
			/* fix up mode if we're not using dynperm */
			if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
				attrs->ia_mode = inode->i_mode & ~S_IWUGO;
		} else if ((mode & S_IWUGO) &&
			   (cifsInode->cifsAttrs & ATTR_READONLY)) {
2343 2344 2345 2346 2347

			dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
			/* Attributes of 0 are ignored */
			if (dosattr == 0)
				dosattr |= ATTR_NORMAL;
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			/* reset local inode permissions to normal */
			if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
				attrs->ia_mode &= ~(S_IALLUGO);
				if (S_ISDIR(inode->i_mode))
					attrs->ia_mode |=
						cifs_sb->mnt_dir_mode;
				else
					attrs->ia_mode |=
						cifs_sb->mnt_file_mode;
			}
		} else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
			/* ignore mode change - ATTR_READONLY hasn't changed */
			attrs->ia_valid &= ~ATTR_MODE;
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		}
	}

2365 2366 2367 2368
	if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
	    ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
		/* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
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2370 2371 2372 2373 2374
		/* Even if error on time set, no sense failing the call if
		the server would set the time to a reasonable value anyway,
		and this check ensures that we are not being called from
		sys_utimes in which case we ought to fail the call back to
		the user when the server rejects the call */
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2375
		if ((rc) && (attrs->ia_valid &
2376
				(ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2377
			rc = 0;
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	}

	/* do not need local check to inode_check_ok since the server does
	   that */
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	if (rc)
		goto cifs_setattr_exit;

	if ((attrs->ia_valid & ATTR_SIZE) &&
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	    attrs->ia_size != i_size_read(inode))
		truncate_setsize(inode, attrs->ia_size);
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	setattr_copy(inode, attrs);
	mark_inode_dirty(inode);

2392
cifs_setattr_exit:
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	kfree(full_path);
2394
	free_xid(xid);
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	return rc;
}

2398 2399 2400
int
cifs_setattr(struct dentry *direntry, struct iattr *attrs)
{
2401
	struct inode *inode = d_inode(direntry);
2402
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2403
	struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2404 2405 2406 2407 2408 2409 2410 2411 2412

	if (pTcon->unix_ext)
		return cifs_setattr_unix(direntry, attrs);

	return cifs_setattr_nounix(direntry, attrs);

	/* BB: add cifs_setattr_legacy for really old servers */
}

2413
#if 0
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2414 2415
void cifs_delete_inode(struct inode *inode)
{
2416
	cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
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	/* may have to add back in if and when safe distributed caching of
	   directories added e.g. via FindNotify */
}
2420
#endif