Commit 62175be2 authored by Trond Myklebust's avatar Trond Myklebust

Implement stateful open() for NFSv4 as per RFC3010-bis.

The resulting state is saved in the NFS-specific part of the
struct inode.

Initially we just start with 3 possible states:
  - open for read
  - open for write
  - open for read/write
parent ec059472
......@@ -140,6 +140,10 @@ nfs_clear_inode(struct inode *inode)
cred = nfsi->cache_access.cred;
if (cred)
put_rpccred(cred);
/* Clean up the V4 state */
nfs4_put_shareowner(inode, nfsi->wo_owner);
nfs4_put_shareowner(inode, nfsi->ro_owner);
nfs4_put_shareowner(inode, nfsi->rw_owner);
}
void
......@@ -1492,9 +1496,18 @@ static struct file_system_type nfs4_fs_type = {
.kill_sb = nfs_kill_super,
.fs_flags = FS_ODD_RENAME,
};
#define nfs4_zero_state(nfsi) \
do { \
(nfsi)->wo_owner = NULL; \
(nfsi)->ro_owner = NULL; \
(nfsi)->rw_owner = NULL; \
} while(0)
#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
#else
#define nfs4_zero_state(nfsi) \
do { } while (0)
#define register_nfs4fs() (0)
#define unregister_nfs4fs()
#endif
......@@ -1516,6 +1529,7 @@ static struct inode *nfs_alloc_inode(struct super_block *sb)
return NULL;
nfsi->flags = 0;
nfsi->mm_cred = NULL;
nfs4_zero_state(nfsi);
return &nfsi->vfs_inode;
}
......
......@@ -346,48 +346,6 @@ nfs4_setup_putrootfh(struct nfs4_compound *cp)
cp->req_nops++;
}
static void
nfs4_setup_open(struct nfs4_compound *cp, int flags, struct qstr *name,
struct iattr *sattr, char *stateid, struct nfs4_change_info *cinfo,
u32 *rflags)
{
struct nfs4_open *open = GET_OP(cp, open);
BUG_ON(cp->flags);
open->op_client_state = cp->server->nfs4_state;
open->op_share_access = flags & 3;
open->op_opentype = (flags & O_CREAT) ? NFS4_OPEN_CREATE : NFS4_OPEN_NOCREATE;
open->op_createmode = NFS4_CREATE_UNCHECKED;
open->op_attrs = sattr;
if (flags & O_EXCL) {
u32 *p = (u32 *) open->op_verifier;
p[0] = jiffies;
p[1] = current->pid;
open->op_createmode = NFS4_CREATE_EXCLUSIVE;
}
open->op_name = name;
open->op_stateid = stateid;
open->op_cinfo = cinfo;
open->op_rflags = rflags;
OPNUM(cp) = OP_OPEN;
cp->req_nops++;
cp->renew_index = cp->req_nops;
}
static void
nfs4_setup_open_confirm(struct nfs4_compound *cp, char *stateid)
{
struct nfs4_open_confirm *open_confirm = GET_OP(cp, open_confirm);
open_confirm->oc_stateid = stateid;
OPNUM(cp) = OP_OPEN_CONFIRM;
cp->req_nops++;
cp->renew_index = cp->req_nops;
}
static void
nfs4_setup_readdir(struct nfs4_compound *cp, u64 cookie, u32 *verifier,
struct page **pages, unsigned int bufsize, struct dentry *dentry)
......@@ -626,44 +584,114 @@ process_cinfo(struct nfs4_change_info *info, struct nfs_fattr *fattr)
}
}
static int
do_open(struct inode *dir, struct qstr *name, int flags, struct iattr *sattr,
struct nfs_fattr *fattr, struct nfs_fh *fhandle, u32 *seqid, char *stateid)
int
nfs4_do_open(struct inode *dir, struct qstr *name, int flags,
struct iattr *sattr, struct nfs_fattr *fattr,
struct nfs_fh *fhandle, struct nfs4_shareowner **spp)
{
struct nfs4_compound compound;
struct nfs4_op ops[7];
struct nfs4_change_info dir_cinfo;
struct nfs_fattr dir_attr;
u32 dir_bmres[2];
u32 bmres[2];
u32 rflags;
struct nfs4_shareowner *sp;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_change_info d_cinfo;
int status;
u32 f_bmres[2];
u32 d_bmres[2];
struct nfs_fattr d_attr = {
.valid 0,
};
struct nfs_fattr f_attr = {
.valid 0,
};
struct nfs4_getattr f_getattr = {
.gt_bmval = nfs4_fattr_bitmap,
.gt_attrs = (fattr == NULL ? &f_attr: fattr),
.gt_bmres = f_bmres,
};
struct nfs4_getattr d_getattr = {
.gt_bmval = nfs4_fattr_bitmap,
.gt_attrs = &d_attr,
.gt_bmres = d_bmres,
};
struct nfs_openargs o_arg = {
.fh = NFS_FH(dir),
.share_access = flags & O_ACCMODE,
.clientid = NFS_SERVER(dir)->nfs4_state->cl_clientid,
.opentype = (flags & O_CREAT) ? NFS4_OPEN_CREATE : NFS4_OPEN_NOCREATE,
.createmode = (flags & O_EXCL) ? NFS4_CREATE_EXCLUSIVE : NFS4_CREATE_UNCHECKED,
.name = name,
.f_getattr = &f_getattr,
.d_getattr = &d_getattr,
};
struct nfs_openres o_res = {
.cinfo = &d_cinfo,
.f_getattr = &f_getattr,
.d_getattr = &d_getattr,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
.rpc_argp = &o_arg,
.rpc_resp = &o_res,
};
dir_attr.valid = 0;
fattr->valid = 0;
nfs4_setup_compound(&compound, ops, NFS_SERVER(dir), "open");
nfs4_setup_putfh(&compound, NFS_FH(dir));
nfs4_setup_savefh(&compound);
nfs4_setup_open(&compound, flags, name, sattr, stateid, &dir_cinfo, &rflags);
nfs4_setup_getattr(&compound, fattr, bmres);
nfs4_setup_getfh(&compound, fhandle);
nfs4_setup_restorefh(&compound);
nfs4_setup_getattr(&compound, &dir_attr, dir_bmres);
if ((status = nfs4_call_compound(&compound, NULL, 0)))
return status;
process_cinfo(&dir_cinfo, &dir_attr);
nfs_refresh_inode(dir, &dir_attr);
if (!(rflags & NFS4_OPEN_RESULT_CONFIRM)) {
*seqid = 1;
return 0;
status = -ENOMEM;
if (!(sp = nfs4_get_shareowner(dir))) {
dprintk("nfs4_do_open: nfs4_get_shareowner failed!\n");
goto out;
}
if (o_arg.createmode & NFS4_CREATE_EXCLUSIVE){
u32 *p = (u32 *) o_arg.u.verifier;
p[0] = jiffies;
p[1] = current->pid;
} else if (o_arg.createmode == NFS4_CREATE_UNCHECKED) {
o_arg.u.attrs = sattr;
}
/* Serialization for the sequence id */
down(&sp->so_sema);
o_arg.seqid = sp->so_seqid;
o_arg.id = sp->so_id;
status = rpc_call_sync(server->client, &msg, 0);
if (status) {
goto out_up;
}
nfs4_increment_seqid(status, sp);
process_cinfo(&d_cinfo, &d_attr);
nfs_refresh_inode(dir, &d_attr);
if (fhandle) {
memset(fhandle, 0, sizeof(*fhandle));
fhandle->size = (o_res.fh.size < NFS_MAXFHSIZE ? o_res.fh.size : NFS_MAXFHSIZE);
memcpy(fhandle->data, o_res.fh.data, fhandle->size);
}
*seqid = 2;
nfs4_setup_compound(&compound, ops, NFS_SERVER(dir), "open_confirm");
nfs4_setup_putfh(&compound, fhandle);
nfs4_setup_open_confirm(&compound, stateid);
return nfs4_call_compound(&compound, NULL, 0);
if(o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
struct nfs_open_confirmargs oc_arg = {
.fh = &o_res.fh,
.seqid = sp->so_seqid,
};
struct nfs_open_confirmres oc_res = {
.status = 0,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
.rpc_argp = &oc_arg,
.rpc_resp = &oc_res,
};
memcpy(oc_arg.stateid, o_res.stateid, sizeof(nfs4_stateid));
status = rpc_call_sync(server->client, &msg, 0);
if (status)
goto out_up;
nfs4_increment_seqid(status, sp);
memcpy(sp->so_stateid, oc_res.stateid, sizeof(nfs4_stateid));
} else
memcpy(sp->so_stateid, o_res.stateid, sizeof(nfs4_stateid));
sp->so_flags = flags & O_ACCMODE;
out_up:
up(&sp->so_sema);
out:
*spp = sp;
return status;
}
static int
......@@ -799,19 +827,19 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
struct inode * inode = dentry->d_inode;
int size_change = sattr->ia_valid & ATTR_SIZE;
struct nfs_fh throwaway_fh;
u32 seqid;
nfs4_stateid stateid;
int status;
struct nfs4_shareowner *sp = NULL;
int status, fake = 1;
fattr->valid = 0;
if (size_change) {
status = do_open(dentry->d_parent->d_inode, &dentry->d_name,
NFS4_SHARE_ACCESS_WRITE, NULL, fattr,
&throwaway_fh, &seqid, stateid);
status = nfs4_do_open(dentry->d_parent->d_inode,
&dentry->d_name,
O_WRONLY, NULL, fattr,
&throwaway_fh,&sp);
if (status)
return status;
fake = 0;
/*
* Because OPEN is always done by name in nfsv4, it is
* possible that we opened a different file by the same
......@@ -823,16 +851,15 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
*/
if (fattr->fileid != NFS_FILEID(inode)) {
printk(KERN_WARNING "nfs: raced in setattr, returning -EIO\n");
do_close(NFS_SERVER(inode), NFS_FH(inode), seqid, stateid);
do_close(NFS_SERVER(inode), NFS_FH(inode), sp->so_seqid, sp->so_stateid);
return -EIO;
}
}
else
memcpy(stateid, zero_stateid, sizeof(nfs4_stateid));
status = do_setattr(NFS_SERVER(inode), fattr, NFS_FH(inode), sattr, stateid);
status = do_setattr(NFS_SERVER(inode), fattr, NFS_FH(inode), sattr,
fake == 1? zero_stateid: sp->so_stateid);
if (size_change)
do_close(NFS_SERVER(inode), NFS_FH(inode), seqid, stateid);
do_close(NFS_SERVER(inode), NFS_FH(inode), sp->so_seqid, sp->so_stateid);
return status;
}
......@@ -1025,21 +1052,38 @@ nfs4_proc_write(struct inode *inode, struct rpc_cred *cred,
return rpc_call_sync(server->client, &msg, rpcflags);
}
/*
* Got race?
* We will need to arrange for the VFS layer to provide an atomic open.
* Until then, this create/open method is prone to inefficiency and race
* conditions due to the lookup, create, and open VFS calls from sys_open()
* placed on the wire.
*
* Given the above sorry state of affairs, I'm simply sending an OPEN, a
* possible SETATTR, and then a CLOSE
* The file will be opened again in the subsequent VFS open call
* (nfs4_proc_file_open).
*
* The open for read will just hang around to be used by any process that
* opens the file O_RDONLY. This will all be resolved with the VFS changes.
*/
static int
nfs4_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr,
int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
int oflags;
u32 seqid;
nfs4_stateid stateid;
struct nfs4_shareowner *sp = NULL;
int status;
oflags = NFS4_SHARE_ACCESS_READ | O_CREAT | (flags & O_EXCL);
status = do_open(dir, name, oflags, sattr, fattr, fhandle, &seqid, stateid);
oflags = O_RDONLY | O_CREAT | (flags & O_EXCL);
status = nfs4_do_open(dir, name, oflags, sattr, fattr, fhandle, &sp);
if (!status) {
if (flags & O_EXCL)
status = do_setattr(NFS_SERVER(dir), fattr, fhandle, sattr, stateid);
do_close(NFS_SERVER(dir), fhandle, seqid, stateid);
if (flags & O_EXCL) {
status = do_setattr(NFS_SERVER(dir), fattr,
fhandle, sattr, sp->so_stateid);
/* XXX should i bother closing the file? */
}
}
return status;
}
......@@ -1561,15 +1605,54 @@ nfs4_proc_renew(struct nfs_server *server)
}
/*
* To be changed into a real NFSv4 file_open soon.
*/
* We will need to arrange for the VFS layer to provide an atomic open.
* Until then, this open method is prone to inefficiency and race conditions
* due to the lookup, potential create, and open VFS calls from sys_open()
* placed on the wire.
*/
int
nfs4_proc_file_open(struct inode *inode, struct file *filp)
{
return 0;
struct dentry *dentry = filp->f_dentry;
struct inode *dir = dentry->d_parent->d_inode;
int flags, status = 0;
dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
(int)dentry->d_parent->d_name.len,
dentry->d_parent->d_name.name,
(int)dentry->d_name.len, dentry->d_name.name);
lock_kernel();
/* isn't this done in open_namei? */
if (!S_ISREG(inode->i_mode)) {
status = -EISDIR;
goto out;
}
flags = filp->f_flags & O_ACCMODE;
/*
* Got race??
* We have already opened the file "O_EXCL" in nfs4_proc_create!!
* This ugliness will go away with lookup-intent...
*/
while (!nfs4_get_inode_share(inode, flags)) {
struct nfs4_shareowner *sp = NULL;
status = nfs4_do_open(dir, &dentry->d_name, flags, NULL, NULL, NULL, &sp);
if (status) {
nfs4_put_shareowner(inode,sp);
break;
}
if (nfs4_set_inode_share(inode, sp, flags))
nfs4_put_shareowner(inode,sp);
}
out:
unlock_kernel();
return status;
}
struct nfs_rpc_ops nfs_v4_clientops = {
.version = 4, /* protocol version */
.getroot = nfs4_proc_get_root,
......
......@@ -42,6 +42,16 @@
#include <linux/slab.h>
#include <linux/nfs_fs.h>
/* This protects most of the client-side state. */
static spinlock_t state_spinlock = SPIN_LOCK_UNLOCKED;
nfs4_stateid zero_stateid =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
nfs4_stateid one_stateid =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
/*
* nfs4_get_client(): returns an empty client structure
* nfs4_put_client(): drops reference to client structure
......@@ -54,11 +64,8 @@ nfs4_get_client(void)
{
struct nfs4_client *clp;
if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL))) {
atomic_set(&clp->cl_count, 1);
clp->cl_clientid = 0;
INIT_LIST_HEAD(&clp->cl_lockowners);
}
if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL)))
memset(clp, 0, sizeof(nfs4_verifier));
return clp;
}
......@@ -66,12 +73,153 @@ void
nfs4_put_client(struct nfs4_client *clp)
{
BUG_ON(!clp);
BUG_ON(!atomic_read(&clp->cl_count));
if (atomic_dec_and_test(&clp->cl_count)) {
BUG_ON(!list_empty(&clp->cl_lockowners));
kfree(clp);
}
static inline u32
nfs4_alloc_lockowner_id(struct nfs4_client *clp)
{
u32 res;
spin_lock(&state_spinlock);
res = clp->cl_lockowner_id ++;
spin_unlock(&state_spinlock);
return res;
}
/*
* nfs4_get_shareowner(): this is called on the OPEN or CREATE path to
* obtain a new shareowner.
*
* There are three shareowners (open_owner4 in rfc3010) per inode,
* one for each possible combination of share lock access. Since
* Linux does not support the deny access type, there are
* three (not 9) referenced by the nfs_inode:
*
* O_WRONLY: inode->wo_owner
* O_RDONLY: inode->ro_owner
* O_RDWR: inode->rw_owner
*
* We create a new shareowner the first time a file is OPENed with
* one of the above shares. All other OPENs with a similar
* share use the single stateid associated with the inode.
*
*/
struct nfs4_shareowner *
nfs4_get_shareowner(struct inode *dir)
{
struct nfs4_client *clp;
struct nfs4_shareowner *sp;
sp = kmalloc(sizeof(*sp),GFP_KERNEL);
if (!sp)
return NULL;
clp = (NFS_SB(dir->i_sb))->nfs4_state;
BUG_ON(!clp);
init_MUTEX(&sp->so_sema);
sp->so_seqid = 0; /* arbitrary */
memset(sp->so_stateid, 0, sizeof(nfs4_stateid));
sp->so_id = nfs4_alloc_lockowner_id(clp);
return sp;
}
/*
* Called for each inode shareowner in nfs_clear_inode,
* or if nfs4_do_open fails.
*/
void
nfs4_put_shareowner(struct inode *inode, struct nfs4_shareowner *sp)
{
if (!sp)
return;
kfree(sp);
}
/*
* Called with sp->so_sema held.
*
* Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
* failed with a seqid incrementing error -
* see comments nfs_fs.h:seqid_mutating_error()
*/
void
nfs4_increment_seqid(u32 status, struct nfs4_shareowner *sp)
{
if (status == NFS_OK || seqid_mutating_err(status))
sp->so_seqid++;
}
/*
* Called by nfs4_proc_open to set the appropriate stateid
*/
int
nfs4_set_inode_share(struct inode * inode, struct nfs4_shareowner *sp, unsigned int open_flags)
{
struct nfs_inode *nfsi = NFS_I(inode);
switch (open_flags & O_ACCMODE) {
case O_RDONLY:
if (!nfsi->ro_owner) {
nfsi->ro_owner = sp;
return 0;
}
break;
case O_WRONLY:
if (!nfsi->wo_owner) {
nfsi->wo_owner = sp;
return 0;
}
break;
case O_RDWR:
if (!nfsi->rw_owner) {
nfsi->rw_owner = sp;
return 0;
}
}
return -EBUSY;
}
/*
* Boolean test to determine if an OPEN call goes on the wire.
*
* Called by nfs4_proc_open.
*/
int
nfs4_test_shareowner(struct inode *inode, unsigned int open_flags)
{
struct nfs_inode *nfsi = NFS_I(inode);
switch (open_flags & O_ACCMODE) {
case O_RDONLY:
if(nfsi->ro_owner)
return 0;
break;
case O_WRONLY:
if(nfsi->wo_owner)
return 0;
break;
case O_RDWR:
if(nfsi->rw_owner)
return 0;
}
return 1;
}
struct nfs4_shareowner *
nfs4_get_inode_share(struct inode * inode, unsigned int open_flags)
{
struct nfs_inode *nfsi = NFS_I(inode);
switch (open_flags & O_ACCMODE) {
case O_RDONLY:
return nfsi->ro_owner;
case O_WRONLY:
return nfsi->wo_owner;
case O_RDWR:
return nfsi->rw_owner;
}
/* Duh gcc warning if we don't... */
return NULL;
}
/*
......
......@@ -72,6 +72,17 @@ extern int nfs_stat_to_errno(int);
#define encode_putfh_maxsz op_encode_hdr_maxsz + 1 + \
(NFS4_FHSIZE >> 2)
#define decode_putfh_maxsz op_decode_hdr_maxsz
#define encode_getfh_maxsz op_encode_hdr_maxsz
#define decode_getfh_maxsz op_decode_hdr_maxsz + 1 + \
(NFS4_FHSIZE >> 2)
#define encode_getattr_maxsz op_encode_hdr_maxsz + 3
#define nfs4_fattr_bitmap_maxsz 26 + 2 * ((NFS4_MAXNAMLEN +1) >> 2)
#define decode_getattr_maxsz op_decode_hdr_maxsz + 3 + \
nfs4_fattr_bitmap_maxsz
#define encode_savefh_maxsz op_encode_hdr_maxsz
#define decode_savefh_maxsz op_decode_hdr_maxsz
#define encode_restorefh_maxsz op_encode_hdr_maxsz
#define decode_restorefh_maxsz op_decode_hdr_maxsz
#define encode_read_getattr_maxsz op_encode_hdr_maxsz + 2
#define decode_read_getattr_maxsz op_decode_hdr_maxsz + 8
#define encode_pre_write_getattr_maxsz op_encode_hdr_maxsz + 2
......@@ -109,6 +120,31 @@ extern int nfs_stat_to_errno(int);
decode_pre_write_getattr_maxsz + \
op_decode_hdr_maxsz + 2 + \
decode_post_write_getattr_maxsz
#define NFS4_enc_open_sz compound_encode_hdr_maxsz + \
encode_putfh_maxsz + \
encode_savefh_maxsz + \
op_encode_hdr_maxsz + \
13 + 3 + 2 + 64 + \
encode_getattr_maxsz + \
encode_getfh_maxsz + \
encode_restorefh_maxsz + \
encode_getattr_maxsz
#define NFS4_dec_open_sz compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
decode_savefh_maxsz + \
op_decode_hdr_maxsz + 4 + 5 + 2 + 3 + \
decode_getattr_maxsz + \
decode_getfh_maxsz + \
decode_restorefh_maxsz + \
decode_getattr_maxsz
#define NFS4_enc_open_confirm_sz \
compound_encode_hdr_maxsz + \
encode_putfh_maxsz + \
op_encode_hdr_maxsz + 5
#define NFS4_dec_open_confirm_sz compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
op_decode_hdr_maxsz + 4
static struct {
......@@ -503,69 +539,76 @@ encode_lookup(struct xdr_stream *xdr, struct nfs4_lookup *lookup)
}
static int
encode_open(struct xdr_stream *xdr, struct nfs4_open *open)
encode_open(struct xdr_stream *xdr, struct nfs_openargs *arg)
{
static int global_id = 0;
int id = global_id++;
int status;
uint32_t *p;
/* seqid, share_access, share_deny, clientid, ownerlen, owner, opentype */
/*
* opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
* owner 4, opentype 4 = 36
*/
RESERVE_SPACE(36);
WRITE32(OP_OPEN);
WRITE32(0); /* seqid */
WRITE32(open->op_share_access);
WRITE32(0); /* for us, share_deny== 0 always */
WRITE64(open->op_client_state->cl_clientid);
WRITE32(arg->seqid);
switch (arg->share_access) {
case O_RDONLY:
WRITE32(NFS4_SHARE_ACCESS_READ);
break;
case O_WRONLY:
WRITE32(NFS4_SHARE_ACCESS_WRITE);
break;
case O_RDWR:
WRITE32(NFS4_SHARE_ACCESS_BOTH);
}
WRITE32(0); /* for linux, share_deny = 0 always */
WRITE64(arg->clientid);
WRITE32(4);
WRITE32(id);
WRITE32(open->op_opentype);
WRITE32(arg->id);
WRITE32(arg->opentype);
if (open->op_opentype == NFS4_OPEN_CREATE) {
if (open->op_createmode == NFS4_CREATE_EXCLUSIVE) {
RESERVE_SPACE(4+sizeof(nfs4_verifier));
WRITE32(open->op_createmode);
WRITEMEM(open->op_verifier, sizeof(nfs4_verifier));
if (arg->opentype == NFS4_OPEN_CREATE) {
if (arg->createmode == NFS4_CREATE_EXCLUSIVE) {
RESERVE_SPACE(12);
WRITE32(arg->createmode);
WRITEMEM(arg->u.verifier, sizeof(nfs4_verifier));
}
else if (open->op_attrs) {
else if (arg->u.attrs) {
RESERVE_SPACE(4);
WRITE32(open->op_createmode);
if ((status = encode_attrs(xdr, open->op_attrs)))
WRITE32(arg->createmode);
if ((status = encode_attrs(xdr, arg->u.attrs)))
return status;
}
else {
RESERVE_SPACE(12);
WRITE32(open->op_createmode);
WRITE32(arg->createmode);
WRITE32(0);
WRITE32(0);
}
}
RESERVE_SPACE(8 + open->op_name->len);
RESERVE_SPACE(8 + arg->name->len);
WRITE32(NFS4_OPEN_CLAIM_NULL);
WRITE32(open->op_name->len);
WRITEMEM(open->op_name->name, open->op_name->len);
WRITE32(arg->name->len);
WRITEMEM(arg->name->name, arg->name->len);
return 0;
}
static int
encode_open_confirm(struct xdr_stream *xdr, struct nfs4_open_confirm *open_confirm)
encode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmargs *arg)
{
uint32_t *p;
/*
* Note: In this "stateless" implementation, the OPEN_CONFIRM
* seqid is always equal to 1.
*/
RESERVE_SPACE(8+sizeof(nfs4_stateid));
WRITE32(OP_OPEN_CONFIRM);
WRITEMEM(open_confirm->oc_stateid, sizeof(nfs4_stateid));
WRITE32(1);
WRITEMEM(arg->stateid, sizeof(nfs4_stateid));
WRITE32(arg->seqid);
return 0;
}
static int
encode_putfh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
......@@ -833,12 +876,6 @@ encode_compound(struct xdr_stream *xdr, struct nfs4_compound *cp, struct rpc_rqs
case OP_LOOKUP:
status = encode_lookup(xdr, &cp->ops[i].u.lookup);
break;
case OP_OPEN:
status = encode_open(xdr, &cp->ops[i].u.open);
break;
case OP_OPEN_CONFIRM:
status = encode_open_confirm(xdr, &cp->ops[i].u.open_confirm);
break;
case OP_PUTFH:
status = encode_putfh(xdr, cp->ops[i].u.putfh.pf_fhandle);
break;
......@@ -903,6 +940,65 @@ nfs4_xdr_enc_compound(struct rpc_rqst *req, uint32_t *p, struct nfs4_compound *c
cp->timestamp = jiffies;
return status;
}
/*
* Encode an OPEN request
*/
static int
nfs4_xdr_enc_open(struct rpc_rqst *req, uint32_t *p, struct nfs_openargs *args)
{
struct xdr_stream xdr;
struct compound_hdr hdr = {
.nops = 7,
};
int status;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, &hdr);
status = encode_putfh(&xdr, args->fh);
if (status)
goto out;
status = encode_savefh(&xdr);
if (status)
goto out;
status = encode_open(&xdr,args);
if (status)
goto out;
status = encode_getattr(&xdr, args->f_getattr);
if (status)
goto out;
status = encode_getfh(&xdr);
if (status)
goto out;
status = encode_restorefh(&xdr);
if (status)
goto out;
status = encode_getattr(&xdr, args->d_getattr);
out:
return status;
}
/*
* Encode an OPEN_CONFIRM request
*/
static int
nfs4_xdr_enc_open_confirm(struct rpc_rqst *req, uint32_t *p, struct nfs_open_confirmargs *args)
{
struct xdr_stream xdr;
struct compound_hdr hdr = {
.nops = 2,
};
int status;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, &hdr);
status = encode_putfh(&xdr, args->fh);
if(status)
goto out;
status = encode_open_confirm(&xdr, args);
out:
return status;
}
/*
* Encode a READ request
......@@ -968,7 +1064,7 @@ nfs4_xdr_enc_write(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args
}
/*
* Encode a COMMIT request
* a COMMIT request
*/
static int
nfs4_xdr_enc_commit(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args)
......@@ -1611,7 +1707,7 @@ decode_lookup(struct xdr_stream *xdr)
}
static int
decode_open(struct xdr_stream *xdr, struct nfs4_open *open)
decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
{
uint32_t *p;
uint32_t bmlen, delegation_type;
......@@ -1621,12 +1717,12 @@ decode_open(struct xdr_stream *xdr, struct nfs4_open *open)
if (status)
return status;
READ_BUF(sizeof(nfs4_stateid));
COPYMEM(open->op_stateid, sizeof(nfs4_stateid));
COPYMEM(res->stateid, sizeof(nfs4_stateid));
decode_change_info(xdr, open->op_cinfo);
decode_change_info(xdr, res->cinfo);
READ_BUF(8);
READ32(*open->op_rflags);
READ32(res->rflags);
READ32(bmlen);
if (bmlen > 10)
goto xdr_error;
......@@ -1641,19 +1737,19 @@ decode_open(struct xdr_stream *xdr, struct nfs4_open *open)
}
static int
decode_open_confirm(struct xdr_stream *xdr, struct nfs4_open_confirm *open_confirm)
decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
{
uint32_t *p;
int status;
status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
if (status)
return status;
res->status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
if (res->status)
return res->status;
READ_BUF(sizeof(nfs4_stateid));
COPYMEM(open_confirm->oc_stateid, sizeof(nfs4_stateid));
COPYMEM(res->stateid, sizeof(nfs4_stateid));
return 0;
}
static int
decode_putfh(struct xdr_stream *xdr)
{
......@@ -1998,12 +2094,6 @@ decode_compound(struct xdr_stream *xdr, struct nfs4_compound *cp, struct rpc_rqs
case OP_LOOKUP:
status = decode_lookup(xdr);
break;
case OP_OPEN:
status = decode_open(xdr, &op->u.open);
break;
case OP_OPEN_CONFIRM:
status = decode_open_confirm(xdr, &op->u.open_confirm);
break;
case OP_PUTFH:
status = decode_putfh(xdr);
break;
......@@ -2075,6 +2165,72 @@ nfs4_xdr_dec_compound(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_compound
return status;
}
/*
* Decode OPEN response
*/
static int
nfs4_xdr_dec_open(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_openres *res)
{
struct xdr_stream xdr;
struct compound_hdr hdr;
struct nfs4_getfh gfh = {
.gf_fhandle = &res->fh,
};
int status;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
status = decode_compound_hdr(&xdr, &hdr);
if (status)
goto out;
status = decode_putfh(&xdr);
if (status)
goto out;
status = decode_savefh(&xdr);
if (status)
goto out;
status = decode_open(&xdr, res);
if (status)
goto out;
status = decode_getattr(&xdr, res->f_getattr);
if (status)
goto out;
status = decode_getfh(&xdr, &gfh);
if (status)
goto out;
status = decode_restorefh(&xdr);
if (status)
goto out;
status = decode_getattr(&xdr, res->d_getattr);
if (status)
goto out;
out:
return status;
}
/*
* Decode OPEN_CONFIRM response
*/
static int
nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_open_confirmres *res)
{
struct xdr_stream xdr;
struct compound_hdr hdr;
int status;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
status = decode_compound_hdr(&xdr, &hdr);
if (status)
goto out;
status = decode_putfh(&xdr);
if (status)
goto out;
status = decode_open_confirm(&xdr, res);
out:
return status;
}
/*
* Decode Read response
*/
......@@ -2216,6 +2372,8 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(READ, enc_read, dec_read),
PROC(WRITE, enc_write, dec_write),
PROC(COMMIT, enc_commit, dec_commit),
PROC(OPEN, enc_open, dec_open),
PROC(OPEN_CONFIRM, enc_open_confirm, dec_open_confirm),
};
struct rpc_version nfs_version4 = {
......
......@@ -206,6 +206,8 @@ enum {
NFSPROC4_CLNT_READ,
NFSPROC4_CLNT_WRITE,
NFSPROC4_CLNT_COMMIT,
NFSPROC4_CLNT_OPEN,
NFSPROC4_CLNT_OPEN_CONFIRM,
};
#endif
......
......@@ -155,6 +155,13 @@ struct nfs_inode {
wait_queue_head_t nfs_i_wait;
#ifdef CONFIG_NFS_V4
/* NFSv4 state */
struct nfs4_shareowner *ro_owner;
struct nfs4_shareowner *wo_owner;
struct nfs4_shareowner *rw_owner;
#endif /* CONFIG_NFS_V4*/
struct inode vfs_inode;
};
......@@ -435,28 +442,74 @@ extern void * nfs_root_data(void);
#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
#ifdef CONFIG_NFS_V4
/*
* In a seqid-mutating op, this macro controls which error return
* values trigger incrementation of the seqid.
*
* from rfc 3010:
* The client MUST monotonically increment the sequence number for the
* CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
* operations. This is true even in the event that the previous
* operation that used the sequence number received an error. The only
* exception to this rule is if the previous operation received one of
* the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
* NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
* NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
*
*/
#define seqid_mutating_err(err) \
(((err) != NFSERR_STALE_CLIENTID) && \
((err) != NFSERR_STALE_STATEID) && \
((err) != NFSERR_BAD_STATEID) && \
((err) != NFSERR_BAD_SEQID) && \
((err) != NFSERR_BAD_XDR) && \
((err) != NFSERR_RESOURCE) && \
((err) != NFSERR_NOFILEHANDLE))
struct nfs4_client {
atomic_t cl_count; /* refcount */
u64 cl_clientid; /* constant */
nfs4_verifier cl_confirm;
/*
* Starts a list of lockowners, linked through lo_list.
*/
struct list_head cl_lockowners; /* protected by state_spinlock */
u32 cl_lockowner_id;
};
/*
* The ->so_sema is held during all shareowner seqid-mutating operations:
* OPEN, OPEN_DOWNGRADE, and CLOSE.
* Its purpose is to properly serialize so_seqid, as mandated by
* the protocol.
*/
struct nfs4_shareowner {
u32 so_id; /* 32-bit identifier, unique */
struct semaphore so_sema;
u32 so_seqid; /* protected by so_sema */
nfs4_stateid so_stateid; /* protected by so_sema */
unsigned int so_flags; /* protected by so_sema */
};
/* nfs4proc.c */
extern int nfs4_proc_renew(struct nfs_server *server);
/* nfs4renewd.c */
extern int nfs4_init_renewd(struct nfs_server *server);
#endif /* CONFIG_NFS_V4 */
#ifdef CONFIG_NFS_V4
/* nfs4state.c */
extern struct nfs4_client *nfs4_get_client(void);
extern void nfs4_put_client(struct nfs4_client *clp);
extern struct nfs4_shareowner * nfs4_get_shareowner(struct inode *inode);
void nfs4_put_shareowner(struct inode *inode, struct nfs4_shareowner *sp);
extern int nfs4_set_inode_share(struct inode * inode,
struct nfs4_shareowner *sp, unsigned int flags);
extern void nfs4_increment_seqid(u32 status, struct nfs4_shareowner *sp);
extern int nfs4_test_shareowner(struct inode *inode, unsigned int open_flags);
struct nfs4_shareowner * nfs4_get_inode_share(struct inode * inode, unsigned int open_flags);
struct nfs4_mount_data;
static inline int
......@@ -481,6 +534,7 @@ destroy_nfsv4_state(struct nfs_server *server)
#else
#define create_nfsv4_state(server, data) 0
#define destroy_nfsv4_state(server) do { } while (0)
#define nfs4_put_shareowner(inode, owner) do { } while (0)
#endif
#endif /* __KERNEL__ */
......
......@@ -87,6 +87,51 @@ struct nfs_pathconf {
__u32 max_namelen; /* max name length */
};
/*
* Arguments to the open call.
*/
struct nfs_openargs {
struct nfs_fh * fh;
__u32 seqid;
__u32 share_access;
__u64 clientid;
__u32 id;
__u32 opentype;
__u32 createmode;
union {
struct iattr * attrs; /* UNCHECKED, GUARDED */
nfs4_verifier verifier; /* EXCLUSIVE */
} u;
struct qstr * name;
struct nfs4_getattr * f_getattr;
struct nfs4_getattr * d_getattr;
};
struct nfs_openres {
__u32 status;
nfs4_stateid stateid;
struct nfs_fh fh;
struct nfs4_change_info * cinfo;
__u32 rflags;
struct nfs4_getattr * f_getattr;
struct nfs4_getattr * d_getattr;
};
/*
* Arguments to the open_confirm call.
*/
struct nfs_open_confirmargs {
struct nfs_fh * fh;
nfs4_stateid stateid;
__u32 seqid;
};
struct nfs_open_confirmres {
__u32 status;
nfs4_stateid stateid;
};
/*
* Arguments to the read call.
*/
......
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