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linux/fs/nfs/nfs4proc.c
J. Bruce Fields 92cfc62cb8 [PATCH] NFS: Allow NFS versions to support different sets of inode operations. 
ACL support will require supporting additional inode operations in v4
 (getxattr, setxattr, listxattr).  This patch allows different protocol versions
 to support different inode operations by adding a file_inode_ops to the
 nfs_rpc_ops (to match the existing dir_inode_ops).

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2005-06-22 16:07:09 -04:00

2787 lines
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/*
* fs/nfs/nfs4proc.c
*
* Client-side procedure declarations for NFSv4.
*
* Copyright (c) 2002 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/smp_lock.h>
#include <linux/namei.h>
#include "nfs4_fs.h"
#include "delegation.h"
#define NFSDBG_FACILITY NFSDBG_PROC
#define NFS4_POLL_RETRY_MIN (1*HZ)
#define NFS4_POLL_RETRY_MAX (15*HZ)
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
extern struct rpc_procinfo nfs4_procedures[];
/* Prevent leaks of NFSv4 errors into userland */
int nfs4_map_errors(int err)
{
if (err < -1000) {
dprintk("%s could not handle NFSv4 error %d\n",
__FUNCTION__, -err);
return -EIO;
}
return err;
}
/*
* This is our standard bitmap for GETATTR requests.
*/
const u32 nfs4_fattr_bitmap[2] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID,
FATTR4_WORD1_MODE
| FATTR4_WORD1_NUMLINKS
| FATTR4_WORD1_OWNER
| FATTR4_WORD1_OWNER_GROUP
| FATTR4_WORD1_RAWDEV
| FATTR4_WORD1_SPACE_USED
| FATTR4_WORD1_TIME_ACCESS
| FATTR4_WORD1_TIME_METADATA
| FATTR4_WORD1_TIME_MODIFY
};
const u32 nfs4_statfs_bitmap[2] = {
FATTR4_WORD0_FILES_AVAIL
| FATTR4_WORD0_FILES_FREE
| FATTR4_WORD0_FILES_TOTAL,
FATTR4_WORD1_SPACE_AVAIL
| FATTR4_WORD1_SPACE_FREE
| FATTR4_WORD1_SPACE_TOTAL
};
const u32 nfs4_pathconf_bitmap[2] = {
FATTR4_WORD0_MAXLINK
| FATTR4_WORD0_MAXNAME,
0
};
const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
| FATTR4_WORD0_MAXREAD
| FATTR4_WORD0_MAXWRITE
| FATTR4_WORD0_LEASE_TIME,
0
};
static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
struct nfs4_readdir_arg *readdir)
{
u32 *start, *p;
BUG_ON(readdir->count < 80);
if (cookie > 2) {
readdir->cookie = (cookie > 2) ? cookie : 0;
memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
return;
}
readdir->cookie = 0;
memset(&readdir->verifier, 0, sizeof(readdir->verifier));
if (cookie == 2)
return;
/*
* NFSv4 servers do not return entries for '.' and '..'
* Therefore, we fake these entries here. We let '.'
* have cookie 0 and '..' have cookie 1. Note that
* when talking to the server, we always send cookie 0
* instead of 1 or 2.
*/
start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
if (cookie == 0) {
*p++ = xdr_one; /* next */
*p++ = xdr_zero; /* cookie, first word */
*p++ = xdr_one; /* cookie, second word */
*p++ = xdr_one; /* entry len */
memcpy(p, ".\0\0\0", 4); /* entry */
p++;
*p++ = xdr_one; /* bitmap length */
*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
*p++ = htonl(8); /* attribute buffer length */
p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
}
*p++ = xdr_one; /* next */
*p++ = xdr_zero; /* cookie, first word */
*p++ = xdr_two; /* cookie, second word */
*p++ = xdr_two; /* entry len */
memcpy(p, "..\0\0", 4); /* entry */
p++;
*p++ = xdr_one; /* bitmap length */
*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
*p++ = htonl(8); /* attribute buffer length */
p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
readdir->pgbase = (char *)p - (char *)start;
readdir->count -= readdir->pgbase;
kunmap_atomic(start, KM_USER0);
}
static void
renew_lease(struct nfs_server *server, unsigned long timestamp)
{
struct nfs4_client *clp = server->nfs4_state;
spin_lock(&clp->cl_lock);
if (time_before(clp->cl_last_renewal,timestamp))
clp->cl_last_renewal = timestamp;
spin_unlock(&clp->cl_lock);
}
static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (cinfo->before == nfsi->change_attr && cinfo->atomic)
nfsi->change_attr = cinfo->after;
}
static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
{
struct inode *inode = state->inode;
open_flags &= (FMODE_READ|FMODE_WRITE);
/* Protect against nfs4_find_state() */
spin_lock(&inode->i_lock);
state->state |= open_flags;
/* NB! List reordering - see the reclaim code for why. */
if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
list_move(&state->open_states, &state->owner->so_states);
if (open_flags & FMODE_READ)
state->nreaders++;
memcpy(&state->stateid, stateid, sizeof(state->stateid));
spin_unlock(&inode->i_lock);
}
/*
* OPEN_RECLAIM:
* reclaim state on the server after a reboot.
* Assumes caller is holding the sp->so_sem
*/
static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_delegation *delegation = NFS_I(inode)->delegation;
struct nfs_openargs o_arg = {
.fh = NFS_FH(inode),
.seqid = sp->so_seqid,
.id = sp->so_id,
.open_flags = state->state,
.clientid = server->nfs4_state->cl_clientid,
.claim = NFS4_OPEN_CLAIM_PREVIOUS,
.bitmask = server->attr_bitmask,
};
struct nfs_openres o_res = {
.server = server, /* Grrr */
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
.rpc_argp = &o_arg,
.rpc_resp = &o_res,
.rpc_cred = sp->so_cred,
};
int status;
if (delegation != NULL) {
if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
memcpy(&state->stateid, &delegation->stateid,
sizeof(state->stateid));
set_bit(NFS_DELEGATED_STATE, &state->flags);
return 0;
}
o_arg.u.delegation_type = delegation->type;
}
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
nfs4_increment_seqid(status, sp);
if (status == 0) {
memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
if (o_res.delegation_type != 0) {
nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
/* Did the server issue an immediate delegation recall? */
if (o_res.do_recall)
nfs_async_inode_return_delegation(inode, &o_res.stateid);
}
}
clear_bit(NFS_DELEGATED_STATE, &state->flags);
/* Ensure we update the inode attributes */
NFS_CACHEINV(inode);
return status;
}
static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_open_reclaim(sp, state);
switch (err) {
case 0:
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
return err;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
{
struct nfs4_state_owner *sp = state->owner;
struct inode *inode = dentry->d_inode;
struct nfs_server *server = NFS_SERVER(inode);
struct dentry *parent = dget_parent(dentry);
struct nfs_openargs arg = {
.fh = NFS_FH(parent->d_inode),
.clientid = server->nfs4_state->cl_clientid,
.name = &dentry->d_name,
.id = sp->so_id,
.server = server,
.bitmask = server->attr_bitmask,
.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
};
struct nfs_openres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = sp->so_cred,
};
int status = 0;
down(&sp->so_sema);
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
goto out;
if (state->state == 0)
goto out;
arg.seqid = sp->so_seqid;
arg.open_flags = state->state;
memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
nfs4_increment_seqid(status, sp);
if (status >= 0) {
memcpy(state->stateid.data, res.stateid.data,
sizeof(state->stateid.data));
clear_bit(NFS_DELEGATED_STATE, &state->flags);
}
out:
up(&sp->so_sema);
dput(parent);
return status;
}
int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
{
struct nfs4_exception exception = { };
struct nfs_server *server = NFS_SERVER(dentry->d_inode);
int err;
do {
err = _nfs4_open_delegation_recall(dentry, state);
switch (err) {
case 0:
return err;
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
/* Don't recall a delegation if it was lost */
nfs4_schedule_state_recovery(server->nfs4_state);
return err;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static inline int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid)
{
struct nfs_open_confirmargs arg = {
.fh = fh,
.seqid = sp->so_seqid,
.stateid = *stateid,
};
struct nfs_open_confirmres res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = sp->so_cred,
};
int status;
status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
nfs4_increment_seqid(status, sp);
if (status >= 0)
memcpy(stateid, &res.stateid, sizeof(*stateid));
return status;
}
static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
{
struct nfs_server *server = NFS_SERVER(dir);
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
.rpc_argp = o_arg,
.rpc_resp = o_res,
.rpc_cred = sp->so_cred,
};
int status;
/* Update sequence id. The caller must serialize! */
o_arg->seqid = sp->so_seqid;
o_arg->id = sp->so_id;
o_arg->clientid = sp->so_client->cl_clientid;
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
nfs4_increment_seqid(status, sp);
if (status != 0)
goto out;
update_changeattr(dir, &o_res->cinfo);
if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
sp, &o_res->stateid);
if (status != 0)
goto out;
}
if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
out:
return status;
}
static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
{
struct nfs_access_entry cache;
int mask = 0;
int status;
if (openflags & FMODE_READ)
mask |= MAY_READ;
if (openflags & FMODE_WRITE)
mask |= MAY_WRITE;
status = nfs_access_get_cached(inode, cred, &cache);
if (status == 0)
goto out;
/* Be clever: ask server to check for all possible rights */
cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
cache.cred = cred;
cache.jiffies = jiffies;
status = _nfs4_proc_access(inode, &cache);
if (status != 0)
return status;
nfs_access_add_cache(inode, &cache);
out:
if ((cache.mask & mask) == mask)
return 0;
return -EACCES;
}
/*
* OPEN_EXPIRED:
* reclaim state on the server after a network partition.
* Assumes caller holds the appropriate lock
*/
static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
{
struct dentry *parent = dget_parent(dentry);
struct inode *dir = parent->d_inode;
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_delegation *delegation = NFS_I(inode)->delegation;
struct nfs_fattr f_attr = {
.valid = 0,
};
struct nfs_openargs o_arg = {
.fh = NFS_FH(dir),
.open_flags = state->state,
.name = &dentry->d_name,
.bitmask = server->attr_bitmask,
.claim = NFS4_OPEN_CLAIM_NULL,
};
struct nfs_openres o_res = {
.f_attr = &f_attr,
.server = server,
};
int status = 0;
if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
status = _nfs4_do_access(inode, sp->so_cred, state->state);
if (status < 0)
goto out;
memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
set_bit(NFS_DELEGATED_STATE, &state->flags);
goto out;
}
status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
if (status != 0)
goto out_nodeleg;
/* Check if files differ */
if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
goto out_stale;
/* Has the file handle changed? */
if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
/* Verify if the change attributes are the same */
if (f_attr.change_attr != NFS_I(inode)->change_attr)
goto out_stale;
if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
goto out_stale;
/* Lets just pretend that this is the same file */
nfs_copy_fh(NFS_FH(inode), &o_res.fh);
NFS_I(inode)->fileid = f_attr.fileid;
}
memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
if (o_res.delegation_type != 0) {
if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
else
nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
}
out_nodeleg:
clear_bit(NFS_DELEGATED_STATE, &state->flags);
out:
dput(parent);
return status;
out_stale:
status = -ESTALE;
/* Invalidate the state owner so we don't ever use it again */
nfs4_drop_state_owner(sp);
d_drop(dentry);
/* Should we be trying to close that stateid? */
goto out_nodeleg;
}
static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
struct nfs_inode *nfsi = NFS_I(state->inode);
struct nfs_open_context *ctx;
int status;
spin_lock(&state->inode->i_lock);
list_for_each_entry(ctx, &nfsi->open_files, list) {
if (ctx->state != state)
continue;
get_nfs_open_context(ctx);
spin_unlock(&state->inode->i_lock);
status = _nfs4_open_expired(sp, state, ctx->dentry);
put_nfs_open_context(ctx);
return status;
}
spin_unlock(&state->inode->i_lock);
return -ENOENT;
}
/*
* Returns an nfs4_state + an extra reference to the inode
*/
static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
{
struct nfs_delegation *delegation;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_client *clp = server->nfs4_state;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs4_state_owner *sp = NULL;
struct nfs4_state *state = NULL;
int open_flags = flags & (FMODE_READ|FMODE_WRITE);
int err;
/* Protect against reboot recovery - NOTE ORDER! */
down_read(&clp->cl_sem);
/* Protect against delegation recall */
down_read(&nfsi->rwsem);
delegation = NFS_I(inode)->delegation;
err = -ENOENT;
if (delegation == NULL || (delegation->type & open_flags) != open_flags)
goto out_err;
err = -ENOMEM;
if (!(sp = nfs4_get_state_owner(server, cred))) {
dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
goto out_err;
}
down(&sp->so_sema);
state = nfs4_get_open_state(inode, sp);
if (state == NULL)
goto out_err;
err = -ENOENT;
if ((state->state & open_flags) == open_flags) {
spin_lock(&inode->i_lock);
if (open_flags & FMODE_READ)
state->nreaders++;
if (open_flags & FMODE_WRITE)
state->nwriters++;
spin_unlock(&inode->i_lock);
goto out_ok;
} else if (state->state != 0)
goto out_err;
lock_kernel();
err = _nfs4_do_access(inode, cred, open_flags);
unlock_kernel();
if (err != 0)
goto out_err;
set_bit(NFS_DELEGATED_STATE, &state->flags);
update_open_stateid(state, &delegation->stateid, open_flags);
out_ok:
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&nfsi->rwsem);
up_read(&clp->cl_sem);
igrab(inode);
*res = state;
return 0;
out_err:
if (sp != NULL) {
if (state != NULL)
nfs4_put_open_state(state);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
}
up_read(&nfsi->rwsem);
up_read(&clp->cl_sem);
return err;
}
static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
{
struct nfs4_exception exception = { };
struct nfs4_state *res;
int err;
do {
err = _nfs4_open_delegated(inode, flags, cred, &res);
if (err == 0)
break;
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
err, &exception));
} while (exception.retry);
return res;
}
/*
* Returns an nfs4_state + an referenced inode
*/
static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
{
struct nfs4_state_owner *sp;
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_client *clp = server->nfs4_state;
struct inode *inode = NULL;
int status;
struct nfs_fattr f_attr = {
.valid = 0,
};
struct nfs_openargs o_arg = {
.fh = NFS_FH(dir),
.open_flags = flags,
.name = &dentry->d_name,
.server = server,
.bitmask = server->attr_bitmask,
.claim = NFS4_OPEN_CLAIM_NULL,
};
struct nfs_openres o_res = {
.f_attr = &f_attr,
.server = server,
};
/* Protect against reboot recovery conflicts */
down_read(&clp->cl_sem);
status = -ENOMEM;
if (!(sp = nfs4_get_state_owner(server, cred))) {
dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
goto out_err;
}
if (flags & O_EXCL) {
u32 *p = (u32 *) o_arg.u.verifier.data;
p[0] = jiffies;
p[1] = current->pid;
} else
o_arg.u.attrs = sattr;
/* Serialization for the sequence id */
down(&sp->so_sema);
status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
if (status != 0)
goto out_err;
status = -ENOMEM;
inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
if (!inode)
goto out_err;
state = nfs4_get_open_state(inode, sp);
if (!state)
goto out_err;
update_open_stateid(state, &o_res.stateid, flags);
if (o_res.delegation_type != 0)
nfs_inode_set_delegation(inode, cred, &o_res);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&clp->cl_sem);
*res = state;
return 0;
out_err:
if (sp != NULL) {
if (state != NULL)
nfs4_put_open_state(state);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
}
/* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
up_read(&clp->cl_sem);
if (inode != NULL)
iput(inode);
*res = NULL;
return status;
}
static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
{
struct nfs4_exception exception = { };
struct nfs4_state *res;
int status;
do {
status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
if (status == 0)
break;
/* NOTE: BAD_SEQID means the server and client disagree about the
* book-keeping w.r.t. state-changing operations
* (OPEN/CLOSE/LOCK/LOCKU...)
* It is actually a sign of a bug on the client or on the server.
*
* If we receive a BAD_SEQID error in the particular case of
* doing an OPEN, we assume that nfs4_increment_seqid() will
* have unhashed the old state_owner for us, and that we can
* therefore safely retry using a new one. We should still warn
* the user though...
*/
if (status == -NFS4ERR_BAD_SEQID) {
printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
exception.retry = 1;
continue;
}
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
status, &exception));
} while (exception.retry);
return res;
}
static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
struct nfs_fh *fhandle, struct iattr *sattr,
struct nfs4_state *state)
{
struct nfs_setattrargs arg = {
.fh = fhandle,
.iap = sattr,
.server = server,
.bitmask = server->attr_bitmask,
};
struct nfs_setattrres res = {
.fattr = fattr,
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
.rpc_argp = &arg,
.rpc_resp = &res,
};
fattr->valid = 0;
if (state != NULL)
msg.rpc_cred = state->owner->so_cred;
if (sattr->ia_valid & ATTR_SIZE)
nfs4_copy_stateid(&arg.stateid, state, NULL);
else
memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
struct nfs_fh *fhandle, struct iattr *sattr,
struct nfs4_state *state)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_do_setattr(server, fattr, fhandle, sattr,
state),
&exception);
} while (exception.retry);
return err;
}
struct nfs4_closedata {
struct inode *inode;
struct nfs4_state *state;
struct nfs_closeargs arg;
struct nfs_closeres res;
};
static void nfs4_close_done(struct rpc_task *task)
{
struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
struct nfs4_state *state = calldata->state;
struct nfs4_state_owner *sp = state->owner;
struct nfs_server *server = NFS_SERVER(calldata->inode);
/* hmm. we are done with the inode, and in the process of freeing
* the state_owner. we keep this around to process errors
*/
nfs4_increment_seqid(task->tk_status, sp);
switch (task->tk_status) {
case 0:
memcpy(&state->stateid, &calldata->res.stateid,
sizeof(state->stateid));
break;
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
state->state = calldata->arg.open_flags;
nfs4_schedule_state_recovery(server->nfs4_state);
break;
default:
if (nfs4_async_handle_error(task, server) == -EAGAIN) {
rpc_restart_call(task);
return;
}
}
state->state = calldata->arg.open_flags;
nfs4_put_open_state(state);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&server->nfs4_state->cl_sem);
kfree(calldata);
}
static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
.rpc_argp = &calldata->arg,
.rpc_resp = &calldata->res,
.rpc_cred = calldata->state->owner->so_cred,
};
if (calldata->arg.open_flags != 0)
msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata);
}
/*
* It is possible for data to be read/written from a mem-mapped file
* after the sys_close call (which hits the vfs layer as a flush).
* This means that we can't safely call nfsv4 close on a file until
* the inode is cleared. This in turn means that we are not good
* NFSv4 citizens - we do not indicate to the server to update the file's
* share state even when we are done with one of the three share
* stateid's in the inode.
*
* NOTE: Caller must be holding the sp->so_owner semaphore!
*/
int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
{
struct nfs4_closedata *calldata;
int status;
/* Tell caller we're done */
if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
state->state = mode;
return 0;
}
calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL);
if (calldata == NULL)
return -ENOMEM;
calldata->inode = inode;
calldata->state = state;
calldata->arg.fh = NFS_FH(inode);
/* Serialization for the sequence id */
calldata->arg.seqid = state->owner->so_seqid;
calldata->arg.open_flags = mode;
memcpy(&calldata->arg.stateid, &state->stateid,
sizeof(calldata->arg.stateid));
status = nfs4_close_call(NFS_SERVER(inode)->client, calldata);
/*
* Return -EINPROGRESS on success in order to indicate to the
* caller that an asynchronous RPC call has been launched, and
* that it will release the semaphores on completion.
*/
return (status == 0) ? -EINPROGRESS : status;
}
struct inode *
nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct iattr attr;
struct rpc_cred *cred;
struct nfs4_state *state;
if (nd->flags & LOOKUP_CREATE) {
attr.ia_mode = nd->intent.open.create_mode;
attr.ia_valid = ATTR_MODE;
if (!IS_POSIXACL(dir))
attr.ia_mode &= ~current->fs->umask;
} else {
attr.ia_valid = 0;
BUG_ON(nd->intent.open.flags & O_CREAT);
}
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
if (IS_ERR(cred))
return (struct inode *)cred;
state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
put_rpccred(cred);
if (IS_ERR(state))
return (struct inode *)state;
return state->inode;
}
int
nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
{
struct rpc_cred *cred;
struct nfs4_state *state;
struct inode *inode;
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
if (IS_ERR(cred))
return PTR_ERR(cred);
state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
if (IS_ERR(state))
state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
put_rpccred(cred);
if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
return 1;
if (IS_ERR(state))
return 0;
inode = state->inode;
if (inode == dentry->d_inode) {
iput(inode);
return 1;
}
d_drop(dentry);
nfs4_close_state(state, openflags);
iput(inode);
return 0;
}
static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
struct nfs4_server_caps_res res = {};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
.rpc_argp = fhandle,
.rpc_resp = &res,
};
int status;
status = rpc_call_sync(server->client, &msg, 0);
if (status == 0) {
memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
server->caps |= NFS_CAP_ACLS;
if (res.has_links != 0)
server->caps |= NFS_CAP_HARDLINKS;
if (res.has_symlinks != 0)
server->caps |= NFS_CAP_SYMLINKS;
server->acl_bitmask = res.acl_bitmask;
}
return status;
}
static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_server_capabilities(server, fhandle),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
struct nfs_fattr * fattr = info->fattr;
struct nfs4_lookup_root_arg args = {
.bitmask = nfs4_fattr_bitmap,
};
struct nfs4_lookup_res res = {
.server = server,
.fattr = fattr,
.fh = fhandle,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
.rpc_argp = &args,
.rpc_resp = &res,
};
fattr->valid = 0;
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_lookup_root(server, fhandle, info),
&exception);
} while (exception.retry);
return err;
}
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
struct nfs_fattr * fattr = info->fattr;
unsigned char * p;
struct qstr q;
struct nfs4_lookup_arg args = {
.dir_fh = fhandle,
.name = &q,
.bitmask = nfs4_fattr_bitmap,
};
struct nfs4_lookup_res res = {
.server = server,
.fattr = fattr,
.fh = fhandle,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
/*
* Now we do a separate LOOKUP for each component of the mount path.
* The LOOKUPs are done separately so that we can conveniently
* catch an ERR_WRONGSEC if it occurs along the way...
*/
status = nfs4_lookup_root(server, fhandle, info);
if (status)
goto out;
p = server->mnt_path;
for (;;) {
struct nfs4_exception exception = { };
while (*p == '/')
p++;
if (!*p)
break;
q.name = p;
while (*p && (*p != '/'))
p++;
q.len = p - q.name;
do {
fattr->valid = 0;
status = nfs4_handle_exception(server,
rpc_call_sync(server->client, &msg, 0),
&exception);
} while (exception.retry);
if (status == 0)
continue;
if (status == -ENOENT) {
printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
}
break;
}
if (status == 0)
status = nfs4_server_capabilities(server, fhandle);
if (status == 0)
status = nfs4_do_fsinfo(server, fhandle, info);
out:
return status;
}
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_getattr_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct nfs4_getattr_res res = {
.fattr = fattr,
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
.rpc_argp = &args,
.rpc_resp = &res,
};
fattr->valid = 0;
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_getattr(server, fhandle, fattr),
&exception);
} while (exception.retry);
return err;
}
/*
* The file is not closed if it is opened due to the a request to change
* the size of the file. The open call will not be needed once the
* VFS layer lookup-intents are implemented.
*
* Close is called when the inode is destroyed.
* If we haven't opened the file for O_WRONLY, we
* need to in the size_change case to obtain a stateid.
*
* Got race?
* Because OPEN is always done by name in nfsv4, it is
* possible that we opened a different file by the same
* name. We can recognize this race condition, but we
* can't do anything about it besides returning an error.
*
* This will be fixed with VFS changes (lookup-intent).
*/
static int
nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
struct iattr *sattr)
{
struct inode * inode = dentry->d_inode;
int size_change = sattr->ia_valid & ATTR_SIZE;
struct nfs4_state *state = NULL;
int need_iput = 0;
int status;
fattr->valid = 0;
if (size_change) {
struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
if (IS_ERR(cred))
return PTR_ERR(cred);
state = nfs4_find_state(inode, cred, FMODE_WRITE);
if (state == NULL) {
state = nfs4_open_delegated(dentry->d_inode,
FMODE_WRITE, cred);
if (IS_ERR(state))
state = nfs4_do_open(dentry->d_parent->d_inode,
dentry, FMODE_WRITE,
NULL, cred);
need_iput = 1;
}
put_rpccred(cred);
if (IS_ERR(state))
return PTR_ERR(state);
if (state->inode != inode) {
printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
status = -EIO;
goto out;
}
}
status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
NFS_FH(inode), sattr, state);
out:
if (state) {
inode = state->inode;
nfs4_close_state(state, FMODE_WRITE);
if (need_iput)
iput(inode);
}
return status;
}
static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
int status;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_lookup_arg args = {
.bitmask = server->attr_bitmask,
.dir_fh = NFS_FH(dir),
.name = name,
};
struct nfs4_lookup_res res = {
.server = server,
.fattr = fattr,
.fh = fhandle,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
.rpc_argp = &args,
.rpc_resp = &res,
};
fattr->valid = 0;
dprintk("NFS call lookup %s\n", name->name);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
dprintk("NFS reply lookup: %d\n", status);
return status;
}
static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_lookup(dir, name, fhandle, fattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs4_accessargs args = {
.fh = NFS_FH(inode),
};
struct nfs4_accessres res = { 0 };
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = entry->cred,
};
int mode = entry->mask;
int status;
/*
* Determine which access bits we want to ask for...
*/
if (mode & MAY_READ)
args.access |= NFS4_ACCESS_READ;
if (S_ISDIR(inode->i_mode)) {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_LOOKUP;
} else {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_EXECUTE;
}
status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
if (!status) {
entry->mask = 0;
if (res.access & NFS4_ACCESS_READ)
entry->mask |= MAY_READ;
if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
entry->mask |= MAY_WRITE;
if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
entry->mask |= MAY_EXEC;
}
return status;
}
static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_access(inode, entry),
&exception);
} while (exception.retry);
return err;
}
/*
* TODO: For the time being, we don't try to get any attributes
* along with any of the zero-copy operations READ, READDIR,
* READLINK, WRITE.
*
* In the case of the first three, we want to put the GETATTR
* after the read-type operation -- this is because it is hard
* to predict the length of a GETATTR response in v4, and thus
* align the READ data correctly. This means that the GETATTR
* may end up partially falling into the page cache, and we should
* shift it into the 'tail' of the xdr_buf before processing.
* To do this efficiently, we need to know the total length
* of data received, which doesn't seem to be available outside
* of the RPC layer.
*
* In the case of WRITE, we also want to put the GETATTR after
* the operation -- in this case because we want to make sure
* we get the post-operation mtime and size. This means that
* we can't use xdr_encode_pages() as written: we need a variant
* of it which would leave room in the 'tail' iovec.
*
* Both of these changes to the XDR layer would in fact be quite
* minor, but I decided to leave them for a subsequent patch.
*/
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
unsigned int pgbase, unsigned int pglen)
{
struct nfs4_readlink args = {
.fh = NFS_FH(inode),
.pgbase = pgbase,
.pglen = pglen,
.pages = &page,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
.rpc_argp = &args,
.rpc_resp = NULL,
};
return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
}
static int nfs4_proc_readlink(struct inode *inode, struct page *page,
unsigned int pgbase, unsigned int pglen)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_readlink(inode, page, pgbase, pglen),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_read(struct nfs_read_data *rdata)
{
int flags = rdata->flags;
struct inode *inode = rdata->inode;
struct nfs_fattr *fattr = rdata->res.fattr;
struct nfs_server *server = NFS_SERVER(inode);
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
.rpc_argp = &rdata->args,
.rpc_resp = &rdata->res,
.rpc_cred = rdata->cred,
};
unsigned long timestamp = jiffies;
int status;
dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
(long long) rdata->args.offset);
fattr->valid = 0;
status = rpc_call_sync(server->client, &msg, flags);
if (!status)
renew_lease(server, timestamp);
dprintk("NFS reply read: %d\n", status);
return status;
}
static int nfs4_proc_read(struct nfs_read_data *rdata)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
_nfs4_proc_read(rdata),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_write(struct nfs_write_data *wdata)
{
int rpcflags = wdata->flags;
struct inode *inode = wdata->inode;
struct nfs_fattr *fattr = wdata->res.fattr;
struct nfs_server *server = NFS_SERVER(inode);
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
.rpc_argp = &wdata->args,
.rpc_resp = &wdata->res,
.rpc_cred = wdata->cred,
};
int status;
dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
(long long) wdata->args.offset);
fattr->valid = 0;
status = rpc_call_sync(server->client, &msg, rpcflags);
dprintk("NFS reply write: %d\n", status);
return status;
}
static int nfs4_proc_write(struct nfs_write_data *wdata)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
_nfs4_proc_write(wdata),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_commit(struct nfs_write_data *cdata)
{
struct inode *inode = cdata->inode;
struct nfs_fattr *fattr = cdata->res.fattr;
struct nfs_server *server = NFS_SERVER(inode);
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
.rpc_argp = &cdata->args,
.rpc_resp = &cdata->res,
.rpc_cred = cdata->cred,
};
int status;
dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
(long long) cdata->args.offset);
fattr->valid = 0;
status = rpc_call_sync(server->client, &msg, 0);
dprintk("NFS reply commit: %d\n", status);
return status;
}
static int nfs4_proc_commit(struct nfs_write_data *cdata)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
_nfs4_proc_commit(cdata),
&exception);
} while (exception.retry);
return err;
}
/*
* 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.
* 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 dentry *dentry, struct iattr *sattr,
int flags)
{
struct nfs4_state *state;
struct rpc_cred *cred;
int status = 0;
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
if (IS_ERR(cred)) {
status = PTR_ERR(cred);
goto out;
}
state = nfs4_do_open(dir, dentry, flags, sattr, cred);
put_rpccred(cred);
if (IS_ERR(state)) {
status = PTR_ERR(state);
goto out;
}
d_instantiate(dentry, state->inode);
if (flags & O_EXCL) {
struct nfs_fattr fattr;
status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
NFS_FH(state->inode), sattr, state);
if (status == 0)
goto out;
} else if (flags != 0)
goto out;
nfs4_close_state(state, flags);
out:
return status;
}
static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
struct nfs4_remove_arg args = {
.fh = NFS_FH(dir),
.name = name,
};
struct nfs4_change_info res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (status == 0)
update_changeattr(dir, &res);
return status;
}
static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_remove(dir, name),
&exception);
} while (exception.retry);
return err;
}
struct unlink_desc {
struct nfs4_remove_arg args;
struct nfs4_change_info res;
};
static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
struct qstr *name)
{
struct unlink_desc *up;
up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
if (!up)
return -ENOMEM;
up->args.fh = NFS_FH(dir->d_inode);
up->args.name = name;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
msg->rpc_argp = &up->args;
msg->rpc_resp = &up->res;
return 0;
}
static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
{
struct rpc_message *msg = &task->tk_msg;
struct unlink_desc *up;
if (msg->rpc_resp != NULL) {
up = container_of(msg->rpc_resp, struct unlink_desc, res);
update_changeattr(dir->d_inode, &up->res);
kfree(up);
msg->rpc_resp = NULL;
msg->rpc_argp = NULL;
}
return 0;
}
static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
struct inode *new_dir, struct qstr *new_name)
{
struct nfs4_rename_arg arg = {
.old_dir = NFS_FH(old_dir),
.new_dir = NFS_FH(new_dir),
.old_name = old_name,
.new_name = new_name,
};
struct nfs4_rename_res res = { };
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
if (!status) {
update_changeattr(old_dir, &res.old_cinfo);
update_changeattr(new_dir, &res.new_cinfo);
}
return status;
}
static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
struct inode *new_dir, struct qstr *new_name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(old_dir),
_nfs4_proc_rename(old_dir, old_name,
new_dir, new_name),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
struct nfs4_link_arg arg = {
.fh = NFS_FH(inode),
.dir_fh = NFS_FH(dir),
.name = name,
};
struct nfs4_change_info cinfo = { };
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
.rpc_argp = &arg,
.rpc_resp = &cinfo,
};
int status;
status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
if (!status)
update_changeattr(dir, &cinfo);
return status;
}
static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_link(inode, dir, name),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_create_arg arg = {
.dir_fh = NFS_FH(dir),
.server = server,
.name = name,
.attrs = sattr,
.ftype = NF4LNK,
.bitmask = server->attr_bitmask,
};
struct nfs4_create_res res = {
.server = server,
.fh = fhandle,
.fattr = fattr,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
if (path->len > NFS4_MAXPATHLEN)
return -ENAMETOOLONG;
arg.u.symlink = path;
fattr->valid = 0;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (!status)
update_changeattr(dir, &res.dir_cinfo);
return status;
}
static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_symlink(dir, name, path, sattr,
fhandle, fattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
struct iattr *sattr)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_fh fhandle;
struct nfs_fattr fattr;
struct nfs4_create_arg arg = {
.dir_fh = NFS_FH(dir),
.server = server,
.name = &dentry->d_name,
.attrs = sattr,
.ftype = NF4DIR,
.bitmask = server->attr_bitmask,
};
struct nfs4_create_res res = {
.server = server,
.fh = &fhandle,
.fattr = &fattr,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
fattr.valid = 0;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (!status) {
update_changeattr(dir, &res.dir_cinfo);
status = nfs_instantiate(dentry, &fhandle, &fattr);
}
return status;
}
static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
struct iattr *sattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_mkdir(dir, dentry, sattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
u64 cookie, struct page *page, unsigned int count, int plus)
{
struct inode *dir = dentry->d_inode;
struct nfs4_readdir_arg args = {
.fh = NFS_FH(dir),
.pages = &page,
.pgbase = 0,
.count = count,
.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
};
struct nfs4_readdir_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
int status;
lock_kernel();
nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
res.pgbase = args.pgbase;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (status == 0)
memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
unlock_kernel();
return status;
}
static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
u64 cookie, struct page *page, unsigned int count, int plus)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
_nfs4_proc_readdir(dentry, cred, cookie,
page, count, plus),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, dev_t rdev)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_fh fh;
struct nfs_fattr fattr;
struct nfs4_create_arg arg = {
.dir_fh = NFS_FH(dir),
.server = server,
.name = &dentry->d_name,
.attrs = sattr,
.bitmask = server->attr_bitmask,
};
struct nfs4_create_res res = {
.server = server,
.fh = &fh,
.fattr = &fattr,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
int mode = sattr->ia_mode;
fattr.valid = 0;
BUG_ON(!(sattr->ia_valid & ATTR_MODE));
BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
if (S_ISFIFO(mode))
arg.ftype = NF4FIFO;
else if (S_ISBLK(mode)) {
arg.ftype = NF4BLK;
arg.u.device.specdata1 = MAJOR(rdev);
arg.u.device.specdata2 = MINOR(rdev);
}
else if (S_ISCHR(mode)) {
arg.ftype = NF4CHR;
arg.u.device.specdata1 = MAJOR(rdev);
arg.u.device.specdata2 = MINOR(rdev);
}
else
arg.ftype = NF4SOCK;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (status == 0) {
update_changeattr(dir, &res.dir_cinfo);
status = nfs_instantiate(dentry, &fh, &fattr);
}
return status;
}
static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, dev_t rdev)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_mknod(dir, dentry, sattr, rdev),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsstat *fsstat)
{
struct nfs4_statfs_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
.rpc_argp = &args,
.rpc_resp = fsstat,
};
fsstat->fattr->valid = 0;
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_statfs(server, fhandle, fsstat),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *fsinfo)
{
struct nfs4_fsinfo_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
.rpc_argp = &args,
.rpc_resp = fsinfo,
};
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_do_fsinfo(server, fhandle, fsinfo),
&exception);
} while (exception.retry);
return err;
}
static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
fsinfo->fattr->valid = 0;
return nfs4_do_fsinfo(server, fhandle, fsinfo);
}
static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_pathconf *pathconf)
{
struct nfs4_pathconf_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
.rpc_argp = &args,
.rpc_resp = pathconf,
};
/* None of the pathconf attributes are mandatory to implement */
if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
memset(pathconf, 0, sizeof(*pathconf));
return 0;
}
pathconf->fattr->valid = 0;
return rpc_call_sync(server->client, &msg, 0);
}
static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_pathconf *pathconf)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_pathconf(server, fhandle, pathconf),
&exception);
} while (exception.retry);
return err;
}
static void
nfs4_read_done(struct rpc_task *task)
{
struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
struct inode *inode = data->inode;
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
rpc_restart_call(task);
return;
}
if (task->tk_status > 0)
renew_lease(NFS_SERVER(inode), data->timestamp);
/* Call back common NFS readpage processing */
nfs_readpage_result(task);
}
static void
nfs4_proc_read_setup(struct nfs_read_data *data)
{
struct rpc_task *task = &data->task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct inode *inode = data->inode;
int flags;
data->timestamp = jiffies;
/* N.B. Do we need to test? Never called for swapfile inode */
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
rpc_call_setup(task, &msg, 0);
}
static void
nfs4_write_done(struct rpc_task *task)
{
struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
struct inode *inode = data->inode;
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
rpc_restart_call(task);
return;
}
if (task->tk_status >= 0)
renew_lease(NFS_SERVER(inode), data->timestamp);
/* Call back common NFS writeback processing */
nfs_writeback_done(task);
}
static void
nfs4_proc_write_setup(struct nfs_write_data *data, int how)
{
struct rpc_task *task = &data->task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct inode *inode = data->inode;
int stable;
int flags;
if (how & FLUSH_STABLE) {
if (!NFS_I(inode)->ncommit)
stable = NFS_FILE_SYNC;
else
stable = NFS_DATA_SYNC;
} else
stable = NFS_UNSTABLE;
data->args.stable = stable;
data->timestamp = jiffies;
/* Set the initial flags for the task. */
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
rpc_call_setup(task, &msg, 0);
}
static void
nfs4_commit_done(struct rpc_task *task)
{
struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
struct inode *inode = data->inode;
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
rpc_restart_call(task);
return;
}
/* Call back common NFS writeback processing */
nfs_commit_done(task);
}
static void
nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
{
struct rpc_task *task = &data->task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct inode *inode = data->inode;
int flags;
/* Set the initial flags for the task. */
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
rpc_call_setup(task, &msg, 0);
}
/*
* nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
* standalone procedure for queueing an asynchronous RENEW.
*/
static void
renew_done(struct rpc_task *task)
{
struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
unsigned long timestamp = (unsigned long)task->tk_calldata;
if (task->tk_status < 0) {
switch (task->tk_status) {
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_EXPIRED:
case -NFS4ERR_CB_PATH_DOWN:
nfs4_schedule_state_recovery(clp);
}
return;
}
spin_lock(&clp->cl_lock);
if (time_before(clp->cl_last_renewal,timestamp))
clp->cl_last_renewal = timestamp;
spin_unlock(&clp->cl_lock);
}
int
nfs4_proc_async_renew(struct nfs4_client *clp)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
.rpc_argp = clp,
.rpc_cred = clp->cl_cred,
};
return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
renew_done, (void *)jiffies);
}
int
nfs4_proc_renew(struct nfs4_client *clp)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
.rpc_argp = clp,
.rpc_cred = clp->cl_cred,
};
unsigned long now = jiffies;
int status;
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
if (status < 0)
return status;
spin_lock(&clp->cl_lock);
if (time_before(clp->cl_last_renewal,now))
clp->cl_last_renewal = now;
spin_unlock(&clp->cl_lock);
return 0;
}
/*
* 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.
*/
static int
nfs4_proc_file_open(struct inode *inode, struct file *filp)
{
struct dentry *dentry = filp->f_dentry;
struct nfs_open_context *ctx;
struct nfs4_state *state = NULL;
struct rpc_cred *cred;
int status = -ENOMEM;
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);
/* Find our open stateid */
cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
if (IS_ERR(cred))
return PTR_ERR(cred);
ctx = alloc_nfs_open_context(dentry, cred);
put_rpccred(cred);
if (unlikely(ctx == NULL))
return -ENOMEM;
status = -EIO; /* ERACE actually */
state = nfs4_find_state(inode, cred, filp->f_mode);
if (unlikely(state == NULL))
goto no_state;
ctx->state = state;
nfs4_close_state(state, filp->f_mode);
ctx->mode = filp->f_mode;
nfs_file_set_open_context(filp, ctx);
put_nfs_open_context(ctx);
if (filp->f_mode & FMODE_WRITE)
nfs_begin_data_update(inode);
return 0;
no_state:
printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
put_nfs_open_context(ctx);
return status;
}
/*
* Release our state
*/
static int
nfs4_proc_file_release(struct inode *inode, struct file *filp)
{
if (filp->f_mode & FMODE_WRITE)
nfs_end_data_update(inode);
nfs_file_clear_open_context(filp);
return 0;
}
static int
nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
{
struct nfs4_client *clp = server->nfs4_state;
if (!clp || task->tk_status >= 0)
return 0;
switch(task->tk_status) {
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
nfs4_schedule_state_recovery(clp);
if (test_bit(NFS4CLNT_OK, &clp->cl_state))
rpc_wake_up_task(task);
task->tk_status = 0;
return -EAGAIN;
case -NFS4ERR_GRACE:
case -NFS4ERR_DELAY:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
task->tk_status = 0;
return -EAGAIN;
case -NFS4ERR_OLD_STATEID:
task->tk_status = 0;
return -EAGAIN;
}
task->tk_status = nfs4_map_errors(task->tk_status);
return 0;
}
static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
{
DEFINE_WAIT(wait);
sigset_t oldset;
int interruptible, res = 0;
might_sleep();
rpc_clnt_sigmask(clnt, &oldset);
interruptible = TASK_UNINTERRUPTIBLE;
if (clnt->cl_intr)
interruptible = TASK_INTERRUPTIBLE;
prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
nfs4_schedule_state_recovery(clp);
if (clnt->cl_intr && signalled())
res = -ERESTARTSYS;
else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
schedule();
finish_wait(&clp->cl_waitq, &wait);
rpc_clnt_sigunmask(clnt, &oldset);
return res;
}
static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
sigset_t oldset;
int res = 0;
might_sleep();
if (*timeout <= 0)
*timeout = NFS4_POLL_RETRY_MIN;
if (*timeout > NFS4_POLL_RETRY_MAX)
*timeout = NFS4_POLL_RETRY_MAX;
rpc_clnt_sigmask(clnt, &oldset);
if (clnt->cl_intr) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(*timeout);
if (signalled())
res = -ERESTARTSYS;
} else {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(*timeout);
}
rpc_clnt_sigunmask(clnt, &oldset);
*timeout <<= 1;
return res;
}
/* This is the error handling routine for processes that are allowed
* to sleep.
*/
int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
{
struct nfs4_client *clp = server->nfs4_state;
int ret = errorcode;
exception->retry = 0;
switch(errorcode) {
case 0:
return 0;
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
ret = nfs4_wait_clnt_recover(server->client, clp);
if (ret == 0)
exception->retry = 1;
break;
case -NFS4ERR_GRACE:
case -NFS4ERR_DELAY:
ret = nfs4_delay(server->client, &exception->timeout);
if (ret == 0)
exception->retry = 1;
break;
case -NFS4ERR_OLD_STATEID:
if (ret == 0)
exception->retry = 1;
}
/* We failed to handle the error */
return nfs4_map_errors(ret);
}
int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
{
nfs4_verifier sc_verifier;
struct nfs4_setclientid setclientid = {
.sc_verifier = &sc_verifier,
.sc_prog = program,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
.rpc_argp = &setclientid,
.rpc_resp = clp,
.rpc_cred = clp->cl_cred,
};
u32 *p;
int loop = 0;
int status;
p = (u32*)sc_verifier.data;
*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
*p = htonl((u32)clp->cl_boot_time.tv_nsec);
for(;;) {
setclientid.sc_name_len = scnprintf(setclientid.sc_name,
sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
clp->cl_cred->cr_ops->cr_name,
clp->cl_id_uniquifier);
setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
sizeof(setclientid.sc_netid), "tcp");
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
sizeof(setclientid.sc_uaddr), "%s.%d.%d",
clp->cl_ipaddr, port >> 8, port & 255);
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
if (status != -NFS4ERR_CLID_INUSE)
break;
if (signalled())
break;
if (loop++ & 1)
ssleep(clp->cl_lease_time + 1);
else
if (++clp->cl_id_uniquifier == 0)
break;
}
return status;
}
int
nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
{
struct nfs_fsinfo fsinfo;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
.rpc_argp = clp,
.rpc_resp = &fsinfo,
.rpc_cred = clp->cl_cred,
};
unsigned long now;
int status;
now = jiffies;
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
if (status == 0) {
spin_lock(&clp->cl_lock);
clp->cl_lease_time = fsinfo.lease_time * HZ;
clp->cl_last_renewal = now;
spin_unlock(&clp->cl_lock);
}
return status;
}
static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
{
struct nfs4_delegreturnargs args = {
.fhandle = NFS_FH(inode),
.stateid = stateid,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
.rpc_argp = &args,
.rpc_cred = cred,
};
return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
}
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_proc_delegreturn(inode, cred, stateid);
switch (err) {
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
nfs4_schedule_state_recovery(server->nfs4_state);
case 0:
return 0;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
/*
* sleep, with exponential backoff, and retry the LOCK operation.
*/
static unsigned long
nfs4_set_lock_task_retry(unsigned long timeout)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(timeout);
timeout <<= 1;
if (timeout > NFS4_LOCK_MAXTIMEOUT)
return NFS4_LOCK_MAXTIMEOUT;
return timeout;
}
static inline int
nfs4_lck_type(int cmd, struct file_lock *request)
{
/* set lock type */
switch (request->fl_type) {
case F_RDLCK:
return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
case F_WRLCK:
return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
case F_UNLCK:
return NFS4_WRITE_LT;
}
BUG();
return 0;
}
static inline uint64_t
nfs4_lck_length(struct file_lock *request)
{
if (request->fl_end == OFFSET_MAX)
return ~(uint64_t)0;
return request->fl_end - request->fl_start + 1;
}
static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_client *clp = server->nfs4_state;
struct nfs_lockargs arg = {
.fh = NFS_FH(inode),
.type = nfs4_lck_type(cmd, request),
.offset = request->fl_start,
.length = nfs4_lck_length(request),
};
struct nfs_lockres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = state->owner->so_cred,
};
struct nfs_lowner nlo;
struct nfs4_lock_state *lsp;
int status;
down_read(&clp->cl_sem);
nlo.clientid = clp->cl_clientid;
down(&state->lock_sema);
lsp = nfs4_find_lock_state(state, request->fl_owner);
if (lsp)
nlo.id = lsp->ls_id;
else {
spin_lock(&clp->cl_lock);
nlo.id = nfs4_alloc_lockowner_id(clp);
spin_unlock(&clp->cl_lock);
}
arg.u.lockt = &nlo;
status = rpc_call_sync(server->client, &msg, 0);
if (!status) {
request->fl_type = F_UNLCK;
} else if (status == -NFS4ERR_DENIED) {
int64_t len, start, end;
start = res.u.denied.offset;
len = res.u.denied.length;
end = start + len - 1;
if (end < 0 || len == 0)
request->fl_end = OFFSET_MAX;
else
request->fl_end = (loff_t)end;
request->fl_start = (loff_t)start;
request->fl_type = F_WRLCK;
if (res.u.denied.type & 1)
request->fl_type = F_RDLCK;
request->fl_pid = 0;
status = 0;
}
if (lsp)
nfs4_put_lock_state(lsp);
up(&state->lock_sema);
up_read(&clp->cl_sem);
return status;
}
static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(state->inode),
_nfs4_proc_getlk(state, cmd, request),
&exception);
} while (exception.retry);
return err;
}
static int do_vfs_lock(struct file *file, struct file_lock *fl)
{
int res = 0;
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
case FL_POSIX:
res = posix_lock_file_wait(file, fl);
break;
case FL_FLOCK:
res = flock_lock_file_wait(file, fl);
break;
default:
BUG();
}
if (res < 0)
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
__FUNCTION__);
return res;
}
static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_client *clp = server->nfs4_state;
struct nfs_lockargs arg = {
.fh = NFS_FH(inode),
.type = nfs4_lck_type(cmd, request),
.offset = request->fl_start,
.length = nfs4_lck_length(request),
};
struct nfs_lockres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = state->owner->so_cred,
};
struct nfs4_lock_state *lsp;
struct nfs_locku_opargs luargs;
int status = 0;
down_read(&clp->cl_sem);
down(&state->lock_sema);
lsp = nfs4_find_lock_state(state, request->fl_owner);
if (!lsp)
goto out;
/* We might have lost the locks! */
if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
luargs.seqid = lsp->ls_seqid;
memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
arg.u.locku = &luargs;
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
nfs4_increment_lock_seqid(status, lsp);
}
if (status == 0) {
memcpy(&lsp->ls_stateid, &res.u.stateid,
sizeof(lsp->ls_stateid));
nfs4_notify_unlck(state, request, lsp);
}
nfs4_put_lock_state(lsp);
out:
up(&state->lock_sema);
if (status == 0)
do_vfs_lock(request->fl_file, request);
up_read(&clp->cl_sem);
return status;
}
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(state->inode),
_nfs4_proc_unlck(state, cmd, request),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
{
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_lock_state *lsp;
struct nfs_lockargs arg = {
.fh = NFS_FH(inode),
.type = nfs4_lck_type(cmd, request),
.offset = request->fl_start,
.length = nfs4_lck_length(request),
};
struct nfs_lockres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = state->owner->so_cred,
};
struct nfs_lock_opargs largs = {
.reclaim = reclaim,
.new_lock_owner = 0,
};
int status;
lsp = nfs4_get_lock_state(state, request->fl_owner);
if (lsp == NULL)
return -ENOMEM;
if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
struct nfs4_state_owner *owner = state->owner;
struct nfs_open_to_lock otl = {
.lock_owner = {
.clientid = server->nfs4_state->cl_clientid,
},
};
otl.lock_seqid = lsp->ls_seqid;
otl.lock_owner.id = lsp->ls_id;
memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
largs.u.open_lock = &otl;
largs.new_lock_owner = 1;
arg.u.lock = &largs;
down(&owner->so_sema);
otl.open_seqid = owner->so_seqid;
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
/* increment open_owner seqid on success, and
* seqid mutating errors */
nfs4_increment_seqid(status, owner);
up(&owner->so_sema);
} else {
struct nfs_exist_lock el = {
.seqid = lsp->ls_seqid,
};
memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
largs.u.exist_lock = &el;
largs.new_lock_owner = 0;
arg.u.lock = &largs;
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
}
/* increment seqid on success, and * seqid mutating errors*/
nfs4_increment_lock_seqid(status, lsp);
/* save the returned stateid. */
if (status == 0) {
memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
lsp->ls_flags |= NFS_LOCK_INITIALIZED;
if (!reclaim)
nfs4_notify_setlk(state, request, lsp);
} else if (status == -NFS4ERR_DENIED)
status = -EAGAIN;
nfs4_put_lock_state(lsp);
return status;
}
static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
{
return _nfs4_do_setlk(state, F_SETLK, request, 1);
}
static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
return _nfs4_do_setlk(state, F_SETLK, request, 0);
}
static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_client *clp = state->owner->so_client;
int status;
down_read(&clp->cl_sem);
down(&state->lock_sema);
status = _nfs4_do_setlk(state, cmd, request, 0);
up(&state->lock_sema);
if (status == 0) {
/* Note: we always want to sleep here! */
request->fl_flags |= FL_SLEEP;
if (do_vfs_lock(request->fl_file, request) < 0)
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
}
up_read(&clp->cl_sem);
return status;
}
static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(state->inode),
_nfs4_proc_setlk(state, cmd, request),
&exception);
} while (exception.retry);
return err;
}
static int
nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
{
struct nfs_open_context *ctx;
struct nfs4_state *state;
unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
int status;
/* verify open state */
ctx = (struct nfs_open_context *)filp->private_data;
state = ctx->state;
if (request->fl_start < 0 || request->fl_end < 0)
return -EINVAL;
if (IS_GETLK(cmd))
return nfs4_proc_getlk(state, F_GETLK, request);
if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
return -EINVAL;
if (request->fl_type == F_UNLCK)
return nfs4_proc_unlck(state, cmd, request);
do {
status = nfs4_proc_setlk(state, cmd, request);
if ((status != -EAGAIN) || IS_SETLK(cmd))
break;
timeout = nfs4_set_lock_task_retry(timeout);
status = -ERESTARTSYS;
if (signalled())
break;
} while(status < 0);
return status;
}
struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
.recover_open = nfs4_open_reclaim,
.recover_lock = nfs4_lock_reclaim,
};
struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
.recover_open = nfs4_open_expired,
.recover_lock = nfs4_lock_expired,
};
struct nfs_rpc_ops nfs_v4_clientops = {
.version = 4, /* protocol version */
.dentry_ops = &nfs4_dentry_operations,
.dir_inode_ops = &nfs4_dir_inode_operations,
.file_inode_ops = &nfs_file_inode_operations,
.getroot = nfs4_proc_get_root,
.getattr = nfs4_proc_getattr,
.setattr = nfs4_proc_setattr,
.lookup = nfs4_proc_lookup,
.access = nfs4_proc_access,
.readlink = nfs4_proc_readlink,
.read = nfs4_proc_read,
.write = nfs4_proc_write,
.commit = nfs4_proc_commit,
.create = nfs4_proc_create,
.remove = nfs4_proc_remove,
.unlink_setup = nfs4_proc_unlink_setup,
.unlink_done = nfs4_proc_unlink_done,
.rename = nfs4_proc_rename,
.link = nfs4_proc_link,
.symlink = nfs4_proc_symlink,
.mkdir = nfs4_proc_mkdir,
.rmdir = nfs4_proc_remove,
.readdir = nfs4_proc_readdir,
.mknod = nfs4_proc_mknod,
.statfs = nfs4_proc_statfs,
.fsinfo = nfs4_proc_fsinfo,
.pathconf = nfs4_proc_pathconf,
.decode_dirent = nfs4_decode_dirent,
.read_setup = nfs4_proc_read_setup,
.write_setup = nfs4_proc_write_setup,
.commit_setup = nfs4_proc_commit_setup,
.file_open = nfs4_proc_file_open,
.file_release = nfs4_proc_file_release,
.lock = nfs4_proc_lock,
};
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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