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coral / linux-mtk / 7955fabe2849bde0b3dbab2aba671f173178fabf / . / fs / nfs / nfs4proc.c
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/*
* fs/nfs/nfs4proc.c
*
* Client-side procedure declarations for NFSv4.
*
* Copyright (c) 2002 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ratelimit.h>
#include <linux/printk.h>
#include <linux/slab.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/nfs_mount.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/module.h>
#include <linux/xattr.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
#include <linux/iversion.h>
#include "nfs4_fs.h"
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "callback.h"
#include "pnfs.h"
#include "netns.h"
#include "nfs4idmap.h"
#include "nfs4session.h"
#include "fscache.h"
#include "nfs4trace.h"
#define NFSDBG_FACILITY NFSDBG_PROC
#define NFS4_BITMASK_SZ 3
#define NFS4_POLL_RETRY_MIN (HZ/10)
#define NFS4_POLL_RETRY_MAX (15*HZ)
/* file attributes which can be mapped to nfs attributes */
#define NFS4_VALID_ATTRS (ATTR_MODE \
| ATTR_UID \
| ATTR_GID \
| ATTR_SIZE \
| ATTR_ATIME \
| ATTR_MTIME \
| ATTR_CTIME \
| ATTR_ATIME_SET \
| ATTR_MTIME_SET)
struct nfs4_opendata;
static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label, struct inode *inode);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
struct nfs_open_context *ctx, struct nfs4_label *ilabel,
struct nfs4_label *olabel);
#ifdef CONFIG_NFS_V4_1
static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
struct rpc_cred *cred,
struct nfs4_slot *slot,
bool is_privileged);
static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
struct rpc_cred *);
static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
struct rpc_cred *, bool);
#endif
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
static inline struct nfs4_label *
nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, struct nfs4_label *label)
{
int err;
if (label == NULL)
return NULL;
if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
return NULL;
err = security_dentry_init_security(dentry, sattr->ia_mode,
&dentry->d_name, (void **)&label->label, &label->len);
if (err == 0)
return label;
return NULL;
}
static inline void
nfs4_label_release_security(struct nfs4_label *label)
{
if (label)
security_release_secctx(label->label, label->len);
}
static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
{
if (label)
return server->attr_bitmask;
return server->attr_bitmask_nl;
}
#else
static inline struct nfs4_label *
nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, struct nfs4_label *l)
{ return NULL; }
static inline void
nfs4_label_release_security(struct nfs4_label *label)
{ return; }
static inline u32 *
nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
{ return server->attr_bitmask; }
#endif
/* Prevent leaks of NFSv4 errors into userland */
static int nfs4_map_errors(int err)
{
if (err >= -1000)
return err;
switch (err) {
case -NFS4ERR_RESOURCE:
case -NFS4ERR_LAYOUTTRYLATER:
case -NFS4ERR_RECALLCONFLICT:
return -EREMOTEIO;
case -NFS4ERR_WRONGSEC:
case -NFS4ERR_WRONG_CRED:
return -EPERM;
case -NFS4ERR_BADOWNER:
case -NFS4ERR_BADNAME:
return -EINVAL;
case -NFS4ERR_SHARE_DENIED:
return -EACCES;
case -NFS4ERR_MINOR_VERS_MISMATCH:
return -EPROTONOSUPPORT;
case -NFS4ERR_FILE_OPEN:
return -EBUSY;
default:
dprintk("%s could not handle NFSv4 error %d\n",
__func__, -err);
break;
}
return -EIO;
}
/*
* This is our standard bitmap for GETATTR requests.
*/
const u32 nfs4_fattr_bitmap[3] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID,
FATTR4_WORD1_MODE
| FATTR4_WORD1_NUMLINKS
| FATTR4_WORD1_OWNER
| FATTR4_WORD1_OWNER_GROUP
| FATTR4_WORD1_RAWDEV
| FATTR4_WORD1_SPACE_USED
| FATTR4_WORD1_TIME_ACCESS
| FATTR4_WORD1_TIME_METADATA
| FATTR4_WORD1_TIME_MODIFY
| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
FATTR4_WORD2_SECURITY_LABEL
#endif
};
static const u32 nfs4_pnfs_open_bitmap[3] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID,
FATTR4_WORD1_MODE
| FATTR4_WORD1_NUMLINKS
| FATTR4_WORD1_OWNER
| FATTR4_WORD1_OWNER_GROUP
| FATTR4_WORD1_RAWDEV
| FATTR4_WORD1_SPACE_USED
| FATTR4_WORD1_TIME_ACCESS
| FATTR4_WORD1_TIME_METADATA
| FATTR4_WORD1_TIME_MODIFY,
FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
| FATTR4_WORD2_SECURITY_LABEL
#endif
};
static const u32 nfs4_open_noattr_bitmap[3] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_FILEID,
};
const u32 nfs4_statfs_bitmap[3] = {
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[3] = {
FATTR4_WORD0_MAXLINK
| FATTR4_WORD0_MAXNAME,
0
};
const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
| FATTR4_WORD0_MAXREAD
| FATTR4_WORD0_MAXWRITE
| FATTR4_WORD0_LEASE_TIME,
FATTR4_WORD1_TIME_DELTA
| FATTR4_WORD1_FS_LAYOUT_TYPES,
FATTR4_WORD2_LAYOUT_BLKSIZE
| FATTR4_WORD2_CLONE_BLKSIZE
};
const u32 nfs4_fs_locations_bitmap[3] = {
FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID
| FATTR4_WORD0_FS_LOCATIONS,
FATTR4_WORD1_OWNER
| FATTR4_WORD1_OWNER_GROUP
| FATTR4_WORD1_RAWDEV
| FATTR4_WORD1_SPACE_USED
| FATTR4_WORD1_TIME_ACCESS
| FATTR4_WORD1_TIME_METADATA
| FATTR4_WORD1_TIME_MODIFY
| FATTR4_WORD1_MOUNTED_ON_FILEID,
};
static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
struct inode *inode)
{
unsigned long cache_validity;
memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
return;
cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
if (!(cache_validity & NFS_INO_REVAL_FORCED))
cache_validity &= ~(NFS_INO_INVALID_CHANGE
| NFS_INO_INVALID_SIZE);
if (!(cache_validity & NFS_INO_INVALID_SIZE))
dst[0] &= ~FATTR4_WORD0_SIZE;
if (!(cache_validity & NFS_INO_INVALID_CHANGE))
dst[0] &= ~FATTR4_WORD0_CHANGE;
}
static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
const __u32 *src, struct inode *inode)
{
nfs4_bitmap_copy_adjust(dst, src, inode);
}
static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
struct nfs4_readdir_arg *readdir)
{
unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
__be32 *start, *p;
if (cookie > 2) {
readdir->cookie = cookie;
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 = kmap_atomic(*readdir->pages);
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(attrs); /* bitmap */
*p++ = htonl(12); /* attribute buffer length */
*p++ = htonl(NF4DIR);
p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
}
*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(attrs); /* bitmap */
*p++ = htonl(12); /* attribute buffer length */
*p++ = htonl(NF4DIR);
p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
readdir->pgbase = (char *)p - (char *)start;
readdir->count -= readdir->pgbase;
kunmap_atomic(start);
}
static void nfs4_test_and_free_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
ops->test_and_free_expired(server, stateid, cred);
}
static void __nfs4_free_revoked_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
stateid->type = NFS4_REVOKED_STATEID_TYPE;
nfs4_test_and_free_stateid(server, stateid, cred);
}
static void nfs4_free_revoked_stateid(struct nfs_server *server,
const nfs4_stateid *stateid,
struct rpc_cred *cred)
{
nfs4_stateid tmp;
nfs4_stateid_copy(&tmp, stateid);
__nfs4_free_revoked_stateid(server, &tmp, cred);
}
static long nfs4_update_delay(long *timeout)
{
long ret;
if (!timeout)
return NFS4_POLL_RETRY_MAX;
if (*timeout <= 0)
*timeout = NFS4_POLL_RETRY_MIN;
if (*timeout > NFS4_POLL_RETRY_MAX)
*timeout = NFS4_POLL_RETRY_MAX;
ret = *timeout;
*timeout <<= 1;
return ret;
}
static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
int res = 0;
might_sleep();
freezable_schedule_timeout_killable_unsafe(
nfs4_update_delay(timeout));
if (fatal_signal_pending(current))
res = -ERESTARTSYS;
return res;
}
/* This is the error handling routine for processes that are allowed
* to sleep.
*/
static int nfs4_do_handle_exception(struct nfs_server *server,
int errorcode, struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_state *state = exception->state;
const nfs4_stateid *stateid = exception->stateid;
struct inode *inode = exception->inode;
int ret = errorcode;
exception->delay = 0;
exception->recovering = 0;
exception->retry = 0;
if (stateid == NULL && state != NULL)
stateid = &state->stateid;
switch(errorcode) {
case 0:
return 0;
case -NFS4ERR_BADHANDLE:
case -ESTALE:
if (inode != NULL && S_ISREG(inode->i_mode))
pnfs_destroy_layout(NFS_I(inode));
break;
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_EXPIRED:
case -NFS4ERR_BAD_STATEID:
if (inode != NULL && stateid != NULL) {
nfs_inode_find_state_and_recover(inode,
stateid);
goto wait_on_recovery;
}
/* Fall through */
case -NFS4ERR_OPENMODE:
if (inode) {
int err;
err = nfs_async_inode_return_delegation(inode,
stateid);
if (err == 0)
goto wait_on_recovery;
if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
exception->retry = 1;
break;
}
}
if (state == NULL)
break;
ret = nfs4_schedule_stateid_recovery(server, state);
if (ret < 0)
break;
goto wait_on_recovery;
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
nfs4_schedule_lease_recovery(clp);
goto wait_on_recovery;
case -NFS4ERR_MOVED:
ret = nfs4_schedule_migration_recovery(server);
if (ret < 0)
break;
goto wait_on_recovery;
case -NFS4ERR_LEASE_MOVED:
nfs4_schedule_lease_moved_recovery(clp);
goto wait_on_recovery;
#if defined(CONFIG_NFS_V4_1)
case -NFS4ERR_BADSESSION:
case -NFS4ERR_BADSLOT:
case -NFS4ERR_BAD_HIGH_SLOT:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case -NFS4ERR_DEADSESSION:
case -NFS4ERR_SEQ_FALSE_RETRY:
case -NFS4ERR_SEQ_MISORDERED:
dprintk("%s ERROR: %d Reset session\n", __func__,
errorcode);
nfs4_schedule_session_recovery(clp->cl_session, errorcode);
goto wait_on_recovery;
#endif /* defined(CONFIG_NFS_V4_1) */
case -NFS4ERR_FILE_OPEN:
if (exception->timeout > HZ) {
/* We have retried a decent amount, time to
* fail
*/
ret = -EBUSY;
break;
}
/* Fall through */
case -NFS4ERR_DELAY:
nfs_inc_server_stats(server, NFSIOS_DELAY);
/* Fall through */
case -NFS4ERR_GRACE:
case -NFS4ERR_LAYOUTTRYLATER:
case -NFS4ERR_RECALLCONFLICT:
exception->delay = 1;
return 0;
case -NFS4ERR_RETRY_UNCACHED_REP:
case -NFS4ERR_OLD_STATEID:
exception->retry = 1;
break;
case -NFS4ERR_BADOWNER:
/* The following works around a Linux server bug! */
case -NFS4ERR_BADNAME:
if (server->caps & NFS_CAP_UIDGID_NOMAP) {
server->caps &= ~NFS_CAP_UIDGID_NOMAP;
exception->retry = 1;
printk(KERN_WARNING "NFS: v4 server %s "
"does not accept raw "
"uid/gids. "
"Reenabling the idmapper.\n",
server->nfs_client->cl_hostname);
}
}
/* We failed to handle the error */
return nfs4_map_errors(ret);
wait_on_recovery:
exception->recovering = 1;
return 0;
}
/* 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 nfs_client *clp = server->nfs_client;
int ret;
ret = nfs4_do_handle_exception(server, errorcode, exception);
if (exception->delay) {
ret = nfs4_delay(server->client, &exception->timeout);
goto out_retry;
}
if (exception->recovering) {
ret = nfs4_wait_clnt_recover(clp);
if (test_bit(NFS_MIG_FAILED, &server->mig_status))
return -EIO;
goto out_retry;
}
return ret;
out_retry:
if (ret == 0)
exception->retry = 1;
return ret;
}
static int
nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
int errorcode, struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
int ret;
ret = nfs4_do_handle_exception(server, errorcode, exception);
if (exception->delay) {
rpc_delay(task, nfs4_update_delay(&exception->timeout));
goto out_retry;
}
if (exception->recovering) {
rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
goto out_retry;
}
if (test_bit(NFS_MIG_FAILED, &server->mig_status))
ret = -EIO;
return ret;
out_retry:
if (ret == 0) {
exception->retry = 1;
/*
* For NFS4ERR_MOVED, the client transport will need to
* be recomputed after migration recovery has completed.
*/
if (errorcode == -NFS4ERR_MOVED)
rpc_task_release_transport(task);
}
return ret;
}
int
nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
struct nfs4_state *state, long *timeout)
{
struct nfs4_exception exception = {
.state = state,
};
if (task->tk_status >= 0)
return 0;
if (timeout)
exception.timeout = *timeout;
task->tk_status = nfs4_async_handle_exception(task, server,
task->tk_status,
&exception);
if (exception.delay && timeout)
*timeout = exception.timeout;
if (exception.retry)
return -EAGAIN;
return 0;
}
/*
* Return 'true' if 'clp' is using an rpc_client that is integrity protected
* or 'false' otherwise.
*/
static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
{
rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
}
static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
{
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 renew_lease(const struct nfs_server *server, unsigned long timestamp)
{
struct nfs_client *clp = server->nfs_client;
if (!nfs4_has_session(clp))
do_renew_lease(clp, timestamp);
}
struct nfs4_call_sync_data {
const struct nfs_server *seq_server;
struct nfs4_sequence_args *seq_args;
struct nfs4_sequence_res *seq_res;
};
void nfs4_init_sequence(struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res, int cache_reply,
int privileged)
{
args->sa_slot = NULL;
args->sa_cache_this = cache_reply;
args->sa_privileged = privileged;
res->sr_slot = NULL;
}
static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
{
struct nfs4_slot *slot = res->sr_slot;
struct nfs4_slot_table *tbl;
tbl = slot->table;
spin_lock(&tbl->slot_tbl_lock);
if (!nfs41_wake_and_assign_slot(tbl, slot))
nfs4_free_slot(tbl, slot);
spin_unlock(&tbl->slot_tbl_lock);
res->sr_slot = NULL;
}
static int nfs40_sequence_done(struct rpc_task *task,
struct nfs4_sequence_res *res)
{
if (res->sr_slot != NULL)
nfs40_sequence_free_slot(res);
return 1;
}
#if defined(CONFIG_NFS_V4_1)
static void nfs41_release_slot(struct nfs4_slot *slot)
{
struct nfs4_session *session;
struct nfs4_slot_table *tbl;
bool send_new_highest_used_slotid = false;
if (!slot)
return;
tbl = slot->table;
session = tbl->session;
/* Bump the slot sequence number */
if (slot->seq_done)
slot->seq_nr++;
slot->seq_done = 0;
spin_lock(&tbl->slot_tbl_lock);
/* Be nice to the server: try to ensure that the last transmitted
* value for highest_user_slotid <= target_highest_slotid
*/
if (tbl->highest_used_slotid > tbl->target_highest_slotid)
send_new_highest_used_slotid = true;
if (nfs41_wake_and_assign_slot(tbl, slot)) {
send_new_highest_used_slotid = false;
goto out_unlock;
}
nfs4_free_slot(tbl, slot);
if (tbl->highest_used_slotid != NFS4_NO_SLOT)
send_new_highest_used_slotid = false;
out_unlock:
spin_unlock(&tbl->slot_tbl_lock);
if (send_new_highest_used_slotid)
nfs41_notify_server(session->clp);
if (waitqueue_active(&tbl->slot_waitq))
wake_up_all(&tbl->slot_waitq);
}
static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
{
nfs41_release_slot(res->sr_slot);
res->sr_slot = NULL;
}
static int nfs41_sequence_process(struct rpc_task *task,
struct nfs4_sequence_res *res)
{
struct nfs4_session *session;
struct nfs4_slot *slot = res->sr_slot;
struct nfs_client *clp;
bool interrupted = false;
int ret = 1;
if (slot == NULL)
goto out_noaction;
/* don't increment the sequence number if the task wasn't sent */
if (!RPC_WAS_SENT(task))
goto out;
session = slot->table->session;
if (slot->interrupted) {
if (res->sr_status != -NFS4ERR_DELAY)
slot->interrupted = 0;
interrupted = true;
}
trace_nfs4_sequence_done(session, res);
/* Check the SEQUENCE operation status */
switch (res->sr_status) {
case 0:
/* Update the slot's sequence and clientid lease timer */
slot->seq_done = 1;
clp = session->clp;
do_renew_lease(clp, res->sr_timestamp);
/* Check sequence flags */
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
!!slot->privileged);
nfs41_update_target_slotid(slot->table, slot, res);
break;
case 1:
/*
* sr_status remains 1 if an RPC level error occurred.
* The server may or may not have processed the sequence
* operation..
* Mark the slot as having hosted an interrupted RPC call.
*/
slot->interrupted = 1;
goto out;
case -NFS4ERR_DELAY:
/* The server detected a resend of the RPC call and
* returned NFS4ERR_DELAY as per Section 2.10.6.2
* of RFC5661.
*/
dprintk("%s: slot=%u seq=%u: Operation in progress\n",
__func__,
slot->slot_nr,
slot->seq_nr);
goto out_retry;
case -NFS4ERR_RETRY_UNCACHED_REP:
case -NFS4ERR_SEQ_FALSE_RETRY:
/*
* The server thinks we tried to replay a request.
* Retry the call after bumping the sequence ID.
*/
goto retry_new_seq;
case -NFS4ERR_BADSLOT:
/*
* The slot id we used was probably retired. Try again
* using a different slot id.
*/
if (slot->slot_nr < slot->table->target_highest_slotid)
goto session_recover;
goto retry_nowait;
case -NFS4ERR_SEQ_MISORDERED:
/*
* Was the last operation on this sequence interrupted?
* If so, retry after bumping the sequence number.
*/
if (interrupted)
goto retry_new_seq;
/*
* Could this slot have been previously retired?
* If so, then the server may be expecting seq_nr = 1!
*/
if (slot->seq_nr != 1) {
slot->seq_nr = 1;
goto retry_nowait;
}
goto session_recover;
default:
/* Just update the slot sequence no. */
slot->seq_done = 1;
}
out:
/* The session may be reset by one of the error handlers. */
dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
out_noaction:
return ret;
session_recover:
nfs4_schedule_session_recovery(session, res->sr_status);
goto retry_nowait;
retry_new_seq:
++slot->seq_nr;
retry_nowait:
if (rpc_restart_call_prepare(task)) {
nfs41_sequence_free_slot(res);
task->tk_status = 0;
ret = 0;
}
goto out;
out_retry:
if (!rpc_restart_call(task))
goto out;
rpc_delay(task, NFS4_POLL_RETRY_MAX);
return 0;
}
int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
{
if (!nfs41_sequence_process(task, res))
return 0;
if (res->sr_slot != NULL)
nfs41_sequence_free_slot(res);
return 1;
}
EXPORT_SYMBOL_GPL(nfs41_sequence_done);
static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
{
if (res->sr_slot == NULL)
return 1;
if (res->sr_slot->table->session != NULL)
return nfs41_sequence_process(task, res);
return nfs40_sequence_done(task, res);
}
static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
{
if (res->sr_slot != NULL) {
if (res->sr_slot->table->session != NULL)
nfs41_sequence_free_slot(res);
else
nfs40_sequence_free_slot(res);
}
}
int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
{
if (res->sr_slot == NULL)
return 1;
if (!res->sr_slot->table->session)
return nfs40_sequence_done(task, res);
return nfs41_sequence_done(task, res);
}
EXPORT_SYMBOL_GPL(nfs4_sequence_done);
static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_call_sync_data *data = calldata;
dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
nfs4_setup_sequence(data->seq_server->nfs_client,
data->seq_args, data->seq_res, task);
}
static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
{
struct nfs4_call_sync_data *data = calldata;
nfs41_sequence_done(task, data->seq_res);
}
static const struct rpc_call_ops nfs41_call_sync_ops = {
.rpc_call_prepare = nfs41_call_sync_prepare,
.rpc_call_done = nfs41_call_sync_done,
};
static void
nfs4_sequence_process_interrupted(struct nfs_client *client,
struct nfs4_slot *slot, struct rpc_cred *cred)
{
struct rpc_task *task;
task = _nfs41_proc_sequence(client, cred, slot, true);
if (!IS_ERR(task))
rpc_put_task_async(task);
}
#else /* !CONFIG_NFS_V4_1 */
static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
{
return nfs40_sequence_done(task, res);
}
static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
{
if (res->sr_slot != NULL)
nfs40_sequence_free_slot(res);
}
int nfs4_sequence_done(struct rpc_task *task,
struct nfs4_sequence_res *res)
{
return nfs40_sequence_done(task, res);
}
EXPORT_SYMBOL_GPL(nfs4_sequence_done);
static void
nfs4_sequence_process_interrupted(struct nfs_client *client,
struct nfs4_slot *slot, struct rpc_cred *cred)
{
WARN_ON_ONCE(1);
slot->interrupted = 0;
}
#endif /* !CONFIG_NFS_V4_1 */
static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
{
res->sr_timestamp = jiffies;
res->sr_status_flags = 0;
res->sr_status = 1;
}
static
void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
struct nfs4_slot *slot)
{
if (!slot)
return;
slot->privileged = args->sa_privileged ? 1 : 0;
args->sa_slot = slot;
res->sr_slot = slot;
}
int nfs4_setup_sequence(struct nfs_client *client,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
struct rpc_task *task)
{
struct nfs4_session *session = nfs4_get_session(client);
struct nfs4_slot_table *tbl = client->cl_slot_tbl;
struct nfs4_slot *slot;
/* slot already allocated? */
if (res->sr_slot != NULL)
goto out_start;
if (session) {
tbl = &session->fc_slot_table;
task->tk_timeout = 0;
}
for (;;) {
spin_lock(&tbl->slot_tbl_lock);
/* The state manager will wait until the slot table is empty */
if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
goto out_sleep;
slot = nfs4_alloc_slot(tbl);
if (IS_ERR(slot)) {
/* Try again in 1/4 second */
if (slot == ERR_PTR(-ENOMEM))
task->tk_timeout = HZ >> 2;
goto out_sleep;
}
spin_unlock(&tbl->slot_tbl_lock);
if (likely(!slot->interrupted))
break;
nfs4_sequence_process_interrupted(client,
slot, task->tk_msg.rpc_cred);
}
nfs4_sequence_attach_slot(args, res, slot);
trace_nfs4_setup_sequence(session, args);
out_start:
nfs41_sequence_res_init(res);
rpc_call_start(task);
return 0;
out_sleep:
if (args->sa_privileged)
rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
NULL, RPC_PRIORITY_PRIVILEGED);
else
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
return -EAGAIN;
}
EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_call_sync_data *data = calldata;
nfs4_setup_sequence(data->seq_server->nfs_client,
data->seq_args, data->seq_res, task);
}
static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
{
struct nfs4_call_sync_data *data = calldata;
nfs4_sequence_done(task, data->seq_res);
}
static const struct rpc_call_ops nfs40_call_sync_ops = {
.rpc_call_prepare = nfs40_call_sync_prepare,
.rpc_call_done = nfs40_call_sync_done,
};
static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res)
{
int ret;
struct rpc_task *task;
struct nfs_client *clp = server->nfs_client;
struct nfs4_call_sync_data data = {
.seq_server = server,
.seq_args = args,
.seq_res = res,
};
struct rpc_task_setup task_setup = {
.rpc_client = clnt,
.rpc_message = msg,
.callback_ops = clp->cl_mvops->call_sync_ops,
.callback_data = &data
};
task = rpc_run_task(&task_setup);
if (IS_ERR(task))
ret = PTR_ERR(task);
else {
ret = task->tk_status;
rpc_put_task(task);
}
return ret;
}
int nfs4_call_sync(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply)
{
nfs4_init_sequence(args, res, cache_reply, 0);
return nfs4_call_sync_sequence(clnt, server, msg, args, res);
}
static void
nfs4_inc_nlink_locked(struct inode *inode)
{
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
inc_nlink(inode);
}
static void
nfs4_dec_nlink_locked(struct inode *inode)
{
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
drop_nlink(inode);
}
static void
update_changeattr_locked(struct inode *dir, struct nfs4_change_info *cinfo,
unsigned long timestamp, unsigned long cache_validity)
{
struct nfs_inode *nfsi = NFS_I(dir);
nfsi->cache_validity |= NFS_INO_INVALID_CTIME
| NFS_INO_INVALID_MTIME
| NFS_INO_INVALID_DATA
| cache_validity;
if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
nfsi->attrtimeo_timestamp = jiffies;
} else {
nfs_force_lookup_revalidate(dir);
if (cinfo->before != inode_peek_iversion_raw(dir))
nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
NFS_INO_INVALID_ACL;
}
inode_set_iversion_raw(dir, cinfo->after);
nfsi->read_cache_jiffies = timestamp;
nfsi->attr_gencount = nfs_inc_attr_generation_counter();
nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
nfs_fscache_invalidate(dir);
}
static void
update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
unsigned long timestamp, unsigned long cache_validity)
{
spin_lock(&dir->i_lock);
update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
spin_unlock(&dir->i_lock);
}
struct nfs4_open_createattrs {
struct nfs4_label *label;
struct iattr *sattr;
const __u32 verf[2];
};
static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
int err, struct nfs4_exception *exception)
{
if (err != -EINVAL)
return false;
if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
return false;
server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
exception->retry = 1;
return true;
}
static u32
nfs4_map_atomic_open_share(struct nfs_server *server,
fmode_t fmode, int openflags)
{
u32 res = 0;
switch (fmode & (FMODE_READ | FMODE_WRITE)) {
case FMODE_READ:
res = NFS4_SHARE_ACCESS_READ;
break;
case FMODE_WRITE:
res = NFS4_SHARE_ACCESS_WRITE;
break;
case FMODE_READ|FMODE_WRITE:
res = NFS4_SHARE_ACCESS_BOTH;
}
if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
goto out;
/* Want no delegation if we're using O_DIRECT */
if (openflags & O_DIRECT)
res |= NFS4_SHARE_WANT_NO_DELEG;
out:
return res;
}
static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server *server,
enum open_claim_type4 claim)
{
if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
return claim;
switch (claim) {
default:
return claim;
case NFS4_OPEN_CLAIM_FH:
return NFS4_OPEN_CLAIM_NULL;
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
return NFS4_OPEN_CLAIM_DELEGATE_CUR;
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
return NFS4_OPEN_CLAIM_DELEGATE_PREV;
}
}
static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
p->o_res.f_attr = &p->f_attr;
p->o_res.f_label = p->f_label;
p->o_res.seqid = p->o_arg.seqid;
p->c_res.seqid = p->c_arg.seqid;
p->o_res.server = p->o_arg.server;
p->o_res.access_request = p->o_arg.access;
nfs_fattr_init(&p->f_attr);
nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
}
static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
struct nfs4_state_owner *sp, fmode_t fmode, int flags,
const struct nfs4_open_createattrs *c,
enum open_claim_type4 claim,
gfp_t gfp_mask)
{
struct dentry *parent = dget_parent(dentry);
struct inode *dir = d_inode(parent);
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
struct nfs4_label *label = (c != NULL) ? c->label : NULL;
struct nfs4_opendata *p;
p = kzalloc(sizeof(*p), gfp_mask);
if (p == NULL)
goto err;
p->f_label = nfs4_label_alloc(server, gfp_mask);
if (IS_ERR(p->f_label))
goto err_free_p;
p->a_label = nfs4_label_alloc(server, gfp_mask);
if (IS_ERR(p->a_label))
goto err_free_f;
alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
if (IS_ERR(p->o_arg.seqid))
goto err_free_label;
nfs_sb_active(dentry->d_sb);
p->dentry = dget(dentry);
p->dir = parent;
p->owner = sp;
atomic_inc(&sp->so_count);
p->o_arg.open_flags = flags;
p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
p->o_arg.share_access = nfs4_map_atomic_open_share(server,
fmode, flags);
if (flags & O_CREAT) {
p->o_arg.umask = current_umask();
p->o_arg.label = nfs4_label_copy(p->a_label, label);
if (c->sattr != NULL && c->sattr->ia_valid != 0) {
p->o_arg.u.attrs = &p->attrs;
memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
memcpy(p->o_arg.u.verifier.data, c->verf,
sizeof(p->o_arg.u.verifier.data));
}
}
/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
* will return permission denied for all bits until close */
if (!(flags & O_EXCL)) {
/* ask server to check for all possible rights as results
* are cached */
switch (p->o_arg.claim) {
default:
break;
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_FH:
p->o_arg.access = NFS4_ACCESS_READ |
NFS4_ACCESS_MODIFY |
NFS4_ACCESS_EXTEND |
NFS4_ACCESS_EXECUTE;
}
}
p->o_arg.clientid = server->nfs_client->cl_clientid;
p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
p->o_arg.name = &dentry->d_name;
p->o_arg.server = server;
p->o_arg.bitmask = nfs4_bitmask(server, label);
p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
switch (p->o_arg.claim) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
p->o_arg.fh = NFS_FH(dir);
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
p->o_arg.fh = NFS_FH(d_inode(dentry));
}
p->c_arg.fh = &p->o_res.fh;
p->c_arg.stateid = &p->o_res.stateid;
p->c_arg.seqid = p->o_arg.seqid;
nfs4_init_opendata_res(p);
kref_init(&p->kref);
return p;
err_free_label:
nfs4_label_free(p->a_label);
err_free_f:
nfs4_label_free(p->f_label);
err_free_p:
kfree(p);
err:
dput(parent);
return NULL;
}
static void nfs4_opendata_free(struct kref *kref)
{
struct nfs4_opendata *p = container_of(kref,
struct nfs4_opendata, kref);
struct super_block *sb = p->dentry->d_sb;
nfs4_lgopen_release(p->lgp);
nfs_free_seqid(p->o_arg.seqid);
nfs4_sequence_free_slot(&p->o_res.seq_res);
if (p->state != NULL)
nfs4_put_open_state(p->state);
nfs4_put_state_owner(p->owner);
nfs4_label_free(p->a_label);
nfs4_label_free(p->f_label);
dput(p->dir);
dput(p->dentry);
nfs_sb_deactive(sb);
nfs_fattr_free_names(&p->f_attr);
kfree(p->f_attr.mdsthreshold);
kfree(p);
}
static void nfs4_opendata_put(struct nfs4_opendata *p)
{
if (p != NULL)
kref_put(&p->kref, nfs4_opendata_free);
}
static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
fmode_t fmode)
{
switch(fmode & (FMODE_READ|FMODE_WRITE)) {
case FMODE_READ|FMODE_WRITE:
return state->n_rdwr != 0;
case FMODE_WRITE:
return state->n_wronly != 0;
case FMODE_READ:
return state->n_rdonly != 0;
}
WARN_ON_ONCE(1);
return false;
}
static int can_open_cached(struct nfs4_state *state, fmode_t mode,
int open_mode, enum open_claim_type4 claim)
{
int ret = 0;
if (open_mode & (O_EXCL|O_TRUNC))
goto out;
switch (claim) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_FH:
goto out;
default:
break;
}
switch (mode & (FMODE_READ|FMODE_WRITE)) {
case FMODE_READ:
ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
&& state->n_rdonly != 0;
break;
case FMODE_WRITE:
ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
&& state->n_wronly != 0;
break;
case FMODE_READ|FMODE_WRITE:
ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
&& state->n_rdwr != 0;
}
out:
return ret;
}
static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
enum open_claim_type4 claim)
{
if (delegation == NULL)
return 0;
if ((delegation->type & fmode) != fmode)
return 0;
switch (claim) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_FH:
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
break;
/* Fall through */
default:
return 0;
}
nfs_mark_delegation_referenced(delegation);
return 1;
}
static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
{
switch (fmode) {
case FMODE_WRITE:
state->n_wronly++;
break;
case FMODE_READ:
state->n_rdonly++;
break;
case FMODE_READ|FMODE_WRITE:
state->n_rdwr++;
}
nfs4_state_set_mode_locked(state, state->state | fmode);
}
#ifdef CONFIG_NFS_V4_1
static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
{
if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
return true;
if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
return true;
if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
return true;
return false;
}
#endif /* CONFIG_NFS_V4_1 */
static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
{
if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
wake_up_all(&state->waitq);
}
static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
const nfs4_stateid *stateid)
{
u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
u32 stateid_seqid = be32_to_cpu(stateid->seqid);
if (stateid_seqid == state_seqid + 1U ||
(stateid_seqid == 1U && state_seqid == 0xffffffffU))
nfs_state_log_update_open_stateid(state);
else
set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
}
static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
{
struct nfs_client *clp = state->owner->so_server->nfs_client;
bool need_recover = false;
if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
need_recover = true;
if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
need_recover = true;
if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
need_recover = true;
if (need_recover)
nfs4_state_mark_reclaim_nograce(clp, state);
}
/*
* Check for whether or not the caller may update the open stateid
* to the value passed in by stateid.
*
* Note: This function relies heavily on the server implementing
* RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
* correctly.
* i.e. The stateid seqids have to be initialised to 1, and
* are then incremented on every state transition.
*/
static bool nfs_need_update_open_stateid(struct nfs4_state *state,
const nfs4_stateid *stateid)
{
if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
if (stateid->seqid == cpu_to_be32(1))
nfs_state_log_update_open_stateid(state);
else
set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
return true;
}
if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
nfs_state_log_out_of_order_open_stateid(state, stateid);
return true;
}
return false;
}
static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
{
if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
return;
if (state->n_wronly)
set_bit(NFS_O_WRONLY_STATE, &state->flags);
if (state->n_rdonly)
set_bit(NFS_O_RDONLY_STATE, &state->flags);
if (state->n_rdwr)
set_bit(NFS_O_RDWR_STATE, &state->flags);
set_bit(NFS_OPEN_STATE, &state->flags);
}
static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
nfs4_stateid *stateid, fmode_t fmode)
{
clear_bit(NFS_O_RDWR_STATE, &state->flags);
switch (fmode & (FMODE_READ|FMODE_WRITE)) {
case FMODE_WRITE:
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
break;
case FMODE_READ:
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
break;
case 0:
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
clear_bit(NFS_OPEN_STATE, &state->flags);
}
if (stateid == NULL)
return;
/* Handle OPEN+OPEN_DOWNGRADE races */
if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
!nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
nfs_resync_open_stateid_locked(state);
goto out;
}
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, stateid);
nfs4_stateid_copy(&state->open_stateid, stateid);
trace_nfs4_open_stateid_update(state->inode, stateid, 0);
out:
nfs_state_log_update_open_stateid(state);
}
static void nfs_clear_open_stateid(struct nfs4_state *state,
nfs4_stateid *arg_stateid,
nfs4_stateid *stateid, fmode_t fmode)
{
write_seqlock(&state->seqlock);
/* Ignore, if the CLOSE argment doesn't match the current stateid */
if (nfs4_state_match_open_stateid_other(state, arg_stateid))
nfs_clear_open_stateid_locked(state, stateid, fmode);
write_sequnlock(&state->seqlock);
if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
}
static void nfs_set_open_stateid_locked(struct nfs4_state *state,
const nfs4_stateid *stateid, nfs4_stateid *freeme)
{
DEFINE_WAIT(wait);
int status = 0;
for (;;) {
if (!nfs_need_update_open_stateid(state, stateid))
return;
if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
break;
if (status)
break;
/* Rely on seqids for serialisation with NFSv4.0 */
if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
break;
prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
/*
* Ensure we process the state changes in the same order
* in which the server processed them by delaying the
* update of the stateid until we are in sequence.
*/
write_sequnlock(&state->seqlock);
spin_unlock(&state->owner->so_lock);
rcu_read_unlock();
trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
if (!signal_pending(current)) {
if (schedule_timeout(5*HZ) == 0)
status = -EAGAIN;
else
status = 0;
} else
status = -EINTR;
finish_wait(&state->waitq, &wait);
rcu_read_lock();
spin_lock(&state->owner->so_lock);
write_seqlock(&state->seqlock);
}
if (test_bit(NFS_OPEN_STATE, &state->flags) &&
!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
nfs4_stateid_copy(freeme, &state->open_stateid);
nfs_test_and_clear_all_open_stateid(state);
}
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, stateid);
nfs4_stateid_copy(&state->open_stateid, stateid);
trace_nfs4_open_stateid_update(state->inode, stateid, status);
nfs_state_log_update_open_stateid(state);
}
static void nfs_state_set_open_stateid(struct nfs4_state *state,
const nfs4_stateid *open_stateid,
fmode_t fmode,
nfs4_stateid *freeme)
{
/*
* Protect the call to nfs4_state_set_mode_locked and
* serialise the stateid update
*/
write_seqlock(&state->seqlock);
nfs_set_open_stateid_locked(state, open_stateid, freeme);
switch (fmode) {
case FMODE_READ:
set_bit(NFS_O_RDONLY_STATE, &state->flags);
break;
case FMODE_WRITE:
set_bit(NFS_O_WRONLY_STATE, &state->flags);
break;
case FMODE_READ|FMODE_WRITE:
set_bit(NFS_O_RDWR_STATE, &state->flags);
}
set_bit(NFS_OPEN_STATE, &state->flags);
write_sequnlock(&state->seqlock);
}
static void nfs_state_set_delegation(struct nfs4_state *state,
const nfs4_stateid *deleg_stateid,
fmode_t fmode)
{
/*
* Protect the call to nfs4_state_set_mode_locked and
* serialise the stateid update
*/
write_seqlock(&state->seqlock);
nfs4_stateid_copy(&state->stateid, deleg_stateid);
set_bit(NFS_DELEGATED_STATE, &state->flags);
write_sequnlock(&state->seqlock);
}
static void nfs_state_clear_delegation(struct nfs4_state *state)
{
write_seqlock(&state->seqlock);
nfs4_stateid_copy(&state->stateid, &state->open_stateid);
clear_bit(NFS_DELEGATED_STATE, &state->flags);
write_sequnlock(&state->seqlock);
}
static int update_open_stateid(struct nfs4_state *state,
const nfs4_stateid *open_stateid,
const nfs4_stateid *delegation,
fmode_t fmode)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs_client *clp = server->nfs_client;
struct nfs_inode *nfsi = NFS_I(state->inode);
struct nfs_delegation *deleg_cur;
nfs4_stateid freeme = { };
int ret = 0;
fmode &= (FMODE_READ|FMODE_WRITE);
rcu_read_lock();
spin_lock(&state->owner->so_lock);
if (open_stateid != NULL) {
nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
ret = 1;
}
deleg_cur = rcu_dereference(nfsi->delegation);
if (deleg_cur == NULL)
goto no_delegation;
spin_lock(&deleg_cur->lock);
if (rcu_dereference(nfsi->delegation) != deleg_cur ||
test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
(deleg_cur->type & fmode) != fmode)
goto no_delegation_unlock;
if (delegation == NULL)
delegation = &deleg_cur->stateid;
else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
goto no_delegation_unlock;
nfs_mark_delegation_referenced(deleg_cur);
nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
ret = 1;
no_delegation_unlock:
spin_unlock(&deleg_cur->lock);
no_delegation:
if (ret)
update_open_stateflags(state, fmode);
spin_unlock(&state->owner->so_lock);
rcu_read_unlock();
if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
nfs4_schedule_state_manager(clp);
if (freeme.type != 0)
nfs4_test_and_free_stateid(server, &freeme,
state->owner->so_cred);
return ret;
}
static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
const nfs4_stateid *stateid)
{
struct nfs4_state *state = lsp->ls_state;
bool ret = false;
spin_lock(&state->state_lock);
if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
goto out_noupdate;
if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
goto out_noupdate;
nfs4_stateid_copy(&lsp->ls_stateid, stateid);
ret = true;
out_noupdate:
spin_unlock(&state->state_lock);
return ret;
}
static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
{
struct nfs_delegation *delegation;
fmode &= FMODE_READ|FMODE_WRITE;
rcu_read_lock();
delegation = rcu_dereference(NFS_I(inode)->delegation);
if (delegation == NULL || (delegation->type & fmode) == fmode) {
rcu_read_unlock();
return;
}
rcu_read_unlock();
nfs4_inode_return_delegation(inode);
}
static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
{
struct nfs4_state *state = opendata->state;
struct nfs_delegation *delegation;
int open_mode = opendata->o_arg.open_flags;
fmode_t fmode = opendata->o_arg.fmode;
enum open_claim_type4 claim = opendata->o_arg.claim;
nfs4_stateid stateid;
int ret = -EAGAIN;
for (;;) {
spin_lock(&state->owner->so_lock);
if (can_open_cached(state, fmode, open_mode, claim)) {
update_open_stateflags(state, fmode);
spin_unlock(&state->owner->so_lock);
goto out_return_state;
}
spin_unlock(&state->owner->so_lock);
rcu_read_lock();
delegation = nfs4_get_valid_delegation(state->inode);
if (!can_open_delegated(delegation, fmode, claim)) {
rcu_read_unlock();
break;
}
/* Save the delegation */
nfs4_stateid_copy(&stateid, &delegation->stateid);
rcu_read_unlock();
nfs_release_seqid(opendata->o_arg.seqid);
if (!opendata->is_recover) {
ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
if (ret != 0)
goto out;
}
ret = -EAGAIN;
/* Try to update the stateid using the delegation */
if (update_open_stateid(state, NULL, &stateid, fmode))
goto out_return_state;
}
out:
return ERR_PTR(ret);
out_return_state:
atomic_inc(&state->count);
return state;
}
static void
nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
{
struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
struct nfs_delegation *delegation;
int delegation_flags = 0;
rcu_read_lock();
delegation = rcu_dereference(NFS_I(state->inode)->delegation);
if (delegation)
delegation_flags = delegation->flags;
rcu_read_unlock();
switch (data->o_arg.claim) {
default:
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
"returning a delegation for "
"OPEN(CLAIM_DELEGATE_CUR)\n",
clp->cl_hostname);
return;
}
if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
nfs_inode_set_delegation(state->inode,
data->owner->so_cred,
data->o_res.delegation_type,
&data->o_res.delegation,
data->o_res.pagemod_limit);
else
nfs_inode_reclaim_delegation(state->inode,
data->owner->so_cred,
data->o_res.delegation_type,
&data->o_res.delegation,
data->o_res.pagemod_limit);
if (data->o_res.do_recall)
nfs_async_inode_return_delegation(state->inode,
&data->o_res.delegation);
}
/*
* Check the inode attributes against the CLAIM_PREVIOUS returned attributes
* and update the nfs4_state.
*/
static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
{
struct inode *inode = data->state->inode;
struct nfs4_state *state = data->state;
int ret;
if (!data->rpc_done) {
if (data->rpc_status)
return ERR_PTR(data->rpc_status);
/* cached opens have already been processed */
goto update;
}
ret = nfs_refresh_inode(inode, &data->f_attr);
if (ret)
return ERR_PTR(ret);
if (data->o_res.delegation_type != 0)
nfs4_opendata_check_deleg(data, state);
update:
update_open_stateid(state, &data->o_res.stateid, NULL,
data->o_arg.fmode);
atomic_inc(&state->count);
return state;
}
static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata *data)
{
struct inode *inode;
switch (data->o_arg.claim) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
if (!(data->f_attr.valid & NFS_ATTR_FATTR))
return ERR_PTR(-EAGAIN);
inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
&data->f_attr, data->f_label);
break;
default:
inode = d_inode(data->dentry);
ihold(inode);
nfs_refresh_inode(inode, &data->f_attr);
}
return inode;
}
static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
{
struct nfs4_state *state;
struct inode *inode;
inode = nfs4_opendata_get_inode(data);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (data->state != NULL && data->state->inode == inode) {
state = data->state;
atomic_inc(&state->count);
} else
state = nfs4_get_open_state(inode, data->owner);
iput(inode);
if (state == NULL)
state = ERR_PTR(-ENOMEM);
return state;
}
static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
struct nfs4_state *state;
if (!data->rpc_done) {
state = nfs4_try_open_cached(data);
trace_nfs4_cached_open(data->state);
goto out;
}
state = nfs4_opendata_find_nfs4_state(data);
if (IS_ERR(state))
goto out;
if (data->o_res.delegation_type != 0)
nfs4_opendata_check_deleg(data, state);
update_open_stateid(state, &data->o_res.stateid, NULL,
data->o_arg.fmode);
out:
nfs_release_seqid(data->o_arg.seqid);
return state;
}
static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
struct nfs4_state *ret;
if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
else
ret = _nfs4_opendata_to_nfs4_state(data);
nfs4_sequence_free_slot(&data->o_res.seq_res);
return ret;
}
static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
{
struct nfs_inode *nfsi = NFS_I(state->inode);
struct nfs_open_context *ctx;
spin_lock(&state->inode->i_lock);
list_for_each_entry(ctx, &nfsi->open_files, list) {
if (ctx->state != state)
continue;
get_nfs_open_context(ctx);
spin_unlock(&state->inode->i_lock);
return ctx;
}
spin_unlock(&state->inode->i_lock);
return ERR_PTR(-ENOENT);
}
static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
struct nfs4_state *state, enum open_claim_type4 claim)
{
struct nfs4_opendata *opendata;
opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
NULL, claim, GFP_NOFS);
if (opendata == NULL)
return ERR_PTR(-ENOMEM);
opendata->state = state;
atomic_inc(&state->count);
return opendata;
}
static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
fmode_t fmode)
{
struct nfs4_state *newstate;
int ret;
if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
return 0;
opendata->o_arg.open_flags = 0;
opendata->o_arg.fmode = fmode;
opendata->o_arg.share_access = nfs4_map_atomic_open_share(
NFS_SB(opendata->dentry->d_sb),
fmode, 0);
memset(&opendata->o_res, 0, sizeof(opendata->o_res));
memset(&opendata->c_res, 0, sizeof(opendata->c_res));
nfs4_init_opendata_res(opendata);
ret = _nfs4_recover_proc_open(opendata);
if (ret != 0)
return ret;
newstate = nfs4_opendata_to_nfs4_state(opendata);
if (IS_ERR(newstate))
return PTR_ERR(newstate);
if (newstate != opendata->state)
ret = -ESTALE;
nfs4_close_state(newstate, fmode);
return ret;
}
static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
{
int ret;
/* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
clear_bit(NFS_O_RDWR_STATE, &state->flags);
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
/* memory barrier prior to reading state->n_* */
clear_bit(NFS_DELEGATED_STATE, &state->flags);
clear_bit(NFS_OPEN_STATE, &state->flags);
smp_rmb();
ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
if (ret != 0)
return ret;
ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
if (ret != 0)
return ret;
ret = nfs4_open_recover_helper(opendata, FMODE_READ);
if (ret != 0)
return ret;
/*
* We may have performed cached opens for all three recoveries.
* Check if we need to update the current stateid.
*/
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
!nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
write_seqlock(&state->seqlock);
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, &state->open_stateid);
write_sequnlock(&state->seqlock);
}
return 0;
}
/*
* OPEN_RECLAIM:
* reclaim state on the server after a reboot.
*/
static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
{
struct nfs_delegation *delegation;
struct nfs4_opendata *opendata;
fmode_t delegation_type = 0;
int status;
opendata = nfs4_open_recoverdata_alloc(ctx, state,
NFS4_OPEN_CLAIM_PREVIOUS);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
rcu_read_lock();
delegation = rcu_dereference(NFS_I(state->inode)->delegation);
if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
delegation_type = delegation->type;
rcu_read_unlock();
opendata->o_arg.u.delegation_type = delegation_type;
status = nfs4_open_recover(opendata, state);
nfs4_opendata_put(opendata);
return status;
}
static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_do_open_reclaim(ctx, state);
trace_nfs4_open_reclaim(ctx, 0, err);
if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
continue;
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
struct nfs_open_context *ctx;
int ret;
ctx = nfs4_state_find_open_context(state);
if (IS_ERR(ctx))
return -EAGAIN;
ret = nfs4_do_open_reclaim(ctx, state);
put_nfs_open_context(ctx);
return ret;
}
static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
{
switch (err) {
default:
printk(KERN_ERR "NFS: %s: unhandled error "
"%d.\n", __func__, err);
case 0:
case -ENOENT:
case -EAGAIN:
case -ESTALE:
break;
case -NFS4ERR_BADSESSION:
case -NFS4ERR_BADSLOT:
case -NFS4ERR_BAD_HIGH_SLOT:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case -NFS4ERR_DEADSESSION:
nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
return -EAGAIN;
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
/* Don't recall a delegation if it was lost */
nfs4_schedule_lease_recovery(server->nfs_client);
return -EAGAIN;
case -NFS4ERR_MOVED:
nfs4_schedule_migration_recovery(server);
return -EAGAIN;
case -NFS4ERR_LEASE_MOVED:
nfs4_schedule_lease_moved_recovery(server->nfs_client);
return -EAGAIN;
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_EXPIRED:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OPENMODE:
nfs_inode_find_state_and_recover(state->inode,
stateid);
nfs4_schedule_stateid_recovery(server, state);
return -EAGAIN;
case -NFS4ERR_DELAY:
case -NFS4ERR_GRACE:
ssleep(1);
return -EAGAIN;
case -ENOMEM:
case -NFS4ERR_DENIED:
if (fl) {
struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
if (lsp)
set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
}
return 0;
}
return err;
}
int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
struct nfs4_state *state, const nfs4_stateid *stateid)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_opendata *opendata;
int err = 0;
opendata = nfs4_open_recoverdata_alloc(ctx, state,
NFS4_OPEN_CLAIM_DELEG_CUR_FH);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
if (err)
goto out;
}
if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
if (err)
goto out;
}
if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
err = nfs4_open_recover_helper(opendata, FMODE_READ);
if (err)
goto out;
}
nfs_state_clear_delegation(state);
out:
nfs4_opendata_put(opendata);
return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
}
static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_opendata *data = calldata;
nfs4_setup_sequence(data->o_arg.server->nfs_client,
&data->c_arg.seq_args, &data->c_res.seq_res, task);
}
static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
{
struct nfs4_opendata *data = calldata;
nfs40_sequence_done(task, &data->c_res.seq_res);
data->rpc_status = task->tk_status;
if (data->rpc_status == 0) {
nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
nfs_confirm_seqid(&data->owner->so_seqid, 0);
renew_lease(data->o_res.server, data->timestamp);
data->rpc_done = true;
}
}
static void nfs4_open_confirm_release(void *calldata)
{
struct nfs4_opendata *data = calldata;
struct nfs4_state *state = NULL;
/* If this request hasn't been cancelled, do nothing */
if (!data->cancelled)
goto out_free;
/* In case of error, no cleanup! */
if (!data->rpc_done)
goto out_free;
state = nfs4_opendata_to_nfs4_state(data);
if (!IS_ERR(state))
nfs4_close_state(state, data->o_arg.fmode);
out_free:
nfs4_opendata_put(data);
}
static const struct rpc_call_ops nfs4_open_confirm_ops = {
.rpc_call_prepare = nfs4_open_confirm_prepare,
.rpc_call_done = nfs4_open_confirm_done,
.rpc_release = nfs4_open_confirm_release,
};
/*
* Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
*/
static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
{
struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
.rpc_argp = &data->c_arg,
.rpc_resp = &data->c_res,
.rpc_cred = data->owner->so_cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs4_open_confirm_ops,
.callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
int status;
nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
data->is_recover);
kref_get(&data->kref);
data->rpc_done = false;
data->rpc_status = 0;
data->timestamp = jiffies;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = rpc_wait_for_completion_task(task);
if (status != 0) {
data->cancelled = true;
smp_wmb();
} else
status = data->rpc_status;
rpc_put_task(task);
return status;
}
static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_opendata *data = calldata;
struct nfs4_state_owner *sp = data->owner;
struct nfs_client *clp = sp->so_server->nfs_client;
enum open_claim_type4 claim = data->o_arg.claim;
if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
goto out_wait;
/*
* Check if we still need to send an OPEN call, or if we can use
* a delegation instead.
*/
if (data->state != NULL) {
struct nfs_delegation *delegation;
if (can_open_cached(data->state, data->o_arg.fmode,
data->o_arg.open_flags, claim))
goto out_no_action;
rcu_read_lock();
delegation = nfs4_get_valid_delegation(data->state->inode);
if (can_open_delegated(delegation, data->o_arg.fmode, claim))
goto unlock_no_action;
rcu_read_unlock();
}
/* Update client id. */
data->o_arg.clientid = clp->cl_clientid;
switch (claim) {
default:
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
/* Fall through */
case NFS4_OPEN_CLAIM_FH:
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
}
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
&data->o_arg.seq_args,
&data->o_res.seq_res,
task) != 0)
nfs_release_seqid(data->o_arg.seqid);
/* Set the create mode (note dependency on the session type) */
data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
if (data->o_arg.open_flags & O_EXCL) {
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
if (nfs4_has_persistent_session(clp))
data->o_arg.createmode = NFS4_CREATE_GUARDED;
else if (clp->cl_mvops->minor_version > 0)
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
}
return;
unlock_no_action:
trace_nfs4_cached_open(data->state);
rcu_read_unlock();
out_no_action:
task->tk_action = NULL;
out_wait:
nfs4_sequence_done(task, &data->o_res.seq_res);
}
static void nfs4_open_done(struct rpc_task *task, void *calldata)
{
struct nfs4_opendata *data = calldata;
data->rpc_status = task->tk_status;
if (!nfs4_sequence_process(task, &data->o_res.seq_res))
return;
if (task->tk_status == 0) {
if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
switch (data->o_res.f_attr->mode & S_IFMT) {
case S_IFREG:
break;
case S_IFLNK:
data->rpc_status = -ELOOP;
break;
case S_IFDIR:
data->rpc_status = -EISDIR;
break;
default:
data->rpc_status = -ENOTDIR;
}
}
renew_lease(data->o_res.server, data->timestamp);
if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
nfs_confirm_seqid(&data->owner->so_seqid, 0);
}
data->rpc_done = true;
}
static void nfs4_open_release(void *calldata)
{
struct nfs4_opendata *data = calldata;
struct nfs4_state *state = NULL;
/* If this request hasn't been cancelled, do nothing */
if (!data->cancelled)
goto out_free;
/* In case of error, no cleanup! */
if (data->rpc_status != 0 || !data->rpc_done)
goto out_free;
/* In case we need an open_confirm, no cleanup! */
if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
goto out_free;
state = nfs4_opendata_to_nfs4_state(data);
if (!IS_ERR(state))
nfs4_close_state(state, data->o_arg.fmode);
out_free:
nfs4_opendata_put(data);
}
static const struct rpc_call_ops nfs4_open_ops = {
.rpc_call_prepare = nfs4_open_prepare,
.rpc_call_done = nfs4_open_done,
.rpc_release = nfs4_open_release,
};
static int nfs4_run_open_task(struct nfs4_opendata *data,
struct nfs_open_context *ctx)
{
struct inode *dir = d_inode(data->dir);
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_openargs *o_arg = &data->o_arg;
struct nfs_openres *o_res = &data->o_res;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
.rpc_argp = o_arg,
.rpc_resp = o_res,
.rpc_cred = data->owner->so_cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs4_open_ops,
.callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
int status;
kref_get(&data->kref);
data->rpc_done = false;
data->rpc_status = 0;
data->cancelled = false;
data->is_recover = false;
if (!ctx) {
nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
data->is_recover = true;
} else {
nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
pnfs_lgopen_prepare(data, ctx);
}
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = rpc_wait_for_completion_task(task);
if (status != 0) {
data->cancelled = true;
smp_wmb();
} else
status = data->rpc_status;
rpc_put_task(task);
return status;
}
static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
{
struct inode *dir = d_inode(data->dir);
struct nfs_openres *o_res = &data->o_res;
int status;
status = nfs4_run_open_task(data, NULL);
if (status != 0 || !data->rpc_done)
return status;
nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
status = _nfs4_proc_open_confirm(data);
return status;
}
/*
* Additional permission checks in order to distinguish between an
* open for read, and an open for execute. This works around the
* fact that NFSv4 OPEN treats read and execute permissions as being
* the same.
* Note that in the non-execute case, we want to turn off permission
* checking if we just created a new file (POSIX open() semantics).
*/
static int nfs4_opendata_access(struct rpc_cred *cred,
struct nfs4_opendata *opendata,
struct nfs4_state *state, fmode_t fmode,
int openflags)
{
struct nfs_access_entry cache;
u32 mask, flags;
/* access call failed or for some reason the server doesn't
* support any access modes -- defer access call until later */
if (opendata->o_res.access_supported == 0)
return 0;
mask = 0;
/*
* Use openflags to check for exec, because fmode won't
* always have FMODE_EXEC set when file open for exec.
*/
if (openflags & __FMODE_EXEC) {
/* ONLY check for exec rights */
if (S_ISDIR(state->inode->i_mode))
mask = NFS4_ACCESS_LOOKUP;
else
mask = NFS4_ACCESS_EXECUTE;
} else if ((fmode & FMODE_READ) && !opendata->file_created)
mask = NFS4_ACCESS_READ;
cache.cred = cred;
nfs_access_set_mask(&cache, opendata->o_res.access_result);
nfs_access_add_cache(state->inode, &cache);
flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
if ((mask & ~cache.mask & flags) == 0)
return 0;
return -EACCES;
}
/*
* Note: On error, nfs4_proc_open will free the struct nfs4_opendata
*/
static int _nfs4_proc_open(struct nfs4_opendata *data,
struct nfs_open_context *ctx)
{
struct inode *dir = d_inode(data->dir);
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_openargs *o_arg = &data->o_arg;
struct nfs_openres *o_res = &data->o_res;
int status;
status = nfs4_run_open_task(data, ctx);
if (!data->rpc_done)
return status;
if (status != 0) {
if (status == -NFS4ERR_BADNAME &&
!(o_arg->open_flags & O_CREAT))
return -ENOENT;
return status;
}
nfs_fattr_map_and_free_names(server, &data->f_attr);
if (o_arg->open_flags & O_CREAT) {
if (o_arg->open_flags & O_EXCL)
data->file_created = true;
else if (o_res->cinfo.before != o_res->cinfo.after)
data->file_created = true;
if (data->file_created ||
inode_peek_iversion_raw(dir) != o_res->cinfo.after)
update_changeattr(dir, &o_res->cinfo,
o_res->f_attr->time_start, 0);
}
if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
server->caps &= ~NFS_CAP_POSIX_LOCK;
if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
status = _nfs4_proc_open_confirm(data);
if (status != 0)
return status;
}
if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
nfs4_sequence_free_slot(&o_res->seq_res);
nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
o_res->f_label, NULL);
}
return 0;
}
/*
* OPEN_EXPIRED:
* reclaim state on the server after a network partition.
* Assumes caller holds the appropriate lock
*/
static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
{
struct nfs4_opendata *opendata;
int ret;
opendata = nfs4_open_recoverdata_alloc(ctx, state,
NFS4_OPEN_CLAIM_FH);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
ret = nfs4_open_recover(opendata, state);
if (ret == -ESTALE)
d_drop(ctx->dentry);
nfs4_opendata_put(opendata);
return ret;
}
static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_open_expired(ctx, state);
trace_nfs4_open_expired(ctx, 0, err);
if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
continue;
switch (err) {
default:
goto out;
case -NFS4ERR_GRACE:
case -NFS4ERR_DELAY:
nfs4_handle_exception(server, err, &exception);
err = 0;
}
} while (exception.retry);
out:
return err;
}
static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
struct nfs_open_context *ctx;
int ret;
ctx = nfs4_state_find_open_context(state);
if (IS_ERR(ctx))
return -EAGAIN;
ret = nfs4_do_open_expired(ctx, state);
put_nfs_open_context(ctx);
return ret;
}
static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
const nfs4_stateid *stateid)
{
nfs_remove_bad_delegation(state->inode, stateid);
nfs_state_clear_delegation(state);
}
static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
{
if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
nfs_finish_clear_delegation_stateid(state, NULL);
}
static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
/* NFSv4.0 doesn't allow for delegation recovery on open expire */
nfs40_clear_delegation_stateid(state);
return nfs4_open_expired(sp, state);
}
static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
return -NFS4ERR_BAD_STATEID;
}
#if defined(CONFIG_NFS_V4_1)
static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
int status;
switch (stateid->type) {
default:
break;
case NFS4_INVALID_STATEID_TYPE:
case NFS4_SPECIAL_STATEID_TYPE:
return -NFS4ERR_BAD_STATEID;
case NFS4_REVOKED_STATEID_TYPE:
goto out_free;
}
status = nfs41_test_stateid(server, stateid, cred);
switch (status) {
case -NFS4ERR_EXPIRED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_DELEG_REVOKED:
break;
default:
return status;
}
out_free:
/* Ack the revoked state to the server */
nfs41_free_stateid(server, stateid, cred, true);
return -NFS4ERR_EXPIRED;
}
static void nfs41_check_delegation_stateid(struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
nfs4_stateid stateid;
struct nfs_delegation *delegation;
struct rpc_cred *cred;
int status;
/* Get the delegation credential for use by test/free_stateid */
rcu_read_lock();
delegation = rcu_dereference(NFS_I(state->inode)->delegation);
if (delegation == NULL) {
rcu_read_unlock();
nfs_state_clear_delegation(state);
return;
}
nfs4_stateid_copy(&stateid, &delegation->stateid);
if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
rcu_read_unlock();
nfs_state_clear_delegation(state);
return;
}
if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
&delegation->flags)) {
rcu_read_unlock();
return;
}
cred = get_rpccred(delegation->cred);
rcu_read_unlock();
status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
trace_nfs4_test_delegation_stateid(state, NULL, status);
if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
nfs_finish_clear_delegation_stateid(state, &stateid);
put_rpccred(cred);
}
/**
* nfs41_check_expired_locks - possibly free a lock stateid
*
* @state: NFSv4 state for an inode
*
* Returns NFS_OK if recovery for this stateid is now finished.
* Otherwise a negative NFS4ERR value is returned.
*/
static int nfs41_check_expired_locks(struct nfs4_state *state)
{
int status, ret = NFS_OK;
struct nfs4_lock_state *lsp, *prev = NULL;
struct nfs_server *server = NFS_SERVER(state->inode);
if (!test_bit(LK_STATE_IN_USE, &state->flags))
goto out;
spin_lock(&state->state_lock);
list_for_each_entry(lsp, &state->lock_states, ls_locks) {
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
refcount_inc(&lsp->ls_count);
spin_unlock(&state->state_lock);
nfs4_put_lock_state(prev);
prev = lsp;
status = nfs41_test_and_free_expired_stateid(server,
&lsp->ls_stateid,
cred);
trace_nfs4_test_lock_stateid(state, lsp, status);
if (status == -NFS4ERR_EXPIRED ||
status == -NFS4ERR_BAD_STATEID) {
clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
if (!recover_lost_locks)
set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
} else if (status != NFS_OK) {
ret = status;
nfs4_put_lock_state(prev);
goto out;
}
spin_lock(&state->state_lock);
}
}
spin_unlock(&state->state_lock);
nfs4_put_lock_state(prev);
out:
return ret;
}
/**
* nfs41_check_open_stateid - possibly free an open stateid
*
* @state: NFSv4 state for an inode
*
* Returns NFS_OK if recovery for this stateid is now finished.
* Otherwise a negative NFS4ERR value is returned.
*/
static int nfs41_check_open_stateid(struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
nfs4_stateid *stateid = &state->open_stateid;
struct rpc_cred *cred = state->owner->so_cred;
int status;
if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) {
if (nfs4_have_delegation(state->inode, state->state))
return NFS_OK;
return -NFS4ERR_OPENMODE;
}
return -NFS4ERR_BAD_STATEID;
}
status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
trace_nfs4_test_open_stateid(state, NULL, status);
if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
clear_bit(NFS_O_RDWR_STATE, &state->flags);
clear_bit(NFS_OPEN_STATE, &state->flags);
stateid->type = NFS4_INVALID_STATEID_TYPE;
return status;
}
if (nfs_open_stateid_recover_openmode(state))
return -NFS4ERR_OPENMODE;
return NFS_OK;
}
static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
int status;
nfs41_check_delegation_stateid(state);
status = nfs41_check_expired_locks(state);
if (status != NFS_OK)
return status;
status = nfs41_check_open_stateid(state);
if (status != NFS_OK)
status = nfs4_open_expired(sp, state);
return status;
}
#endif
/*
* on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
* fields corresponding to attributes that were used to store the verifier.
* Make sure we clobber those fields in the later setattr call
*/
static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
struct iattr *sattr, struct nfs4_label **label)
{
const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
__u32 attrset[3];
unsigned ret;
unsigned i;
for (i = 0; i < ARRAY_SIZE(attrset); i++) {
attrset[i] = opendata->o_res.attrset[i];
if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
attrset[i] &= ~bitmask[i];
}
ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
sattr->ia_valid : 0;
if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
if (sattr->ia_valid & ATTR_ATIME_SET)
ret |= ATTR_ATIME_SET;
else
ret |= ATTR_ATIME;
}
if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
if (sattr->ia_valid & ATTR_MTIME_SET)
ret |= ATTR_MTIME_SET;
else
ret |= ATTR_MTIME;
}
if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
*label = NULL;
return ret;
}
static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
fmode_t fmode,
int flags,
struct nfs_open_context *ctx)
{
struct nfs4_state_owner *sp = opendata->owner;
struct nfs_server *server = sp->so_server;
struct dentry *dentry;
struct nfs4_state *state;
unsigned int seq;
int ret;
seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
ret = _nfs4_proc_open(opendata, ctx);
if (ret != 0)
goto out;
state = _nfs4_opendata_to_nfs4_state(opendata);
ret = PTR_ERR(state);
if (IS_ERR(state))
goto out;
ctx->state = state;
if (server->caps & NFS_CAP_POSIX_LOCK)
set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
dentry = opendata->dentry;
if (d_really_is_negative(dentry)) {
struct dentry *alias;
d_drop(dentry);
alias = d_exact_alias(dentry, state->inode);
if (!alias)
alias = d_splice_alias(igrab(state->inode), dentry);
/* d_splice_alias() can't fail here - it's a non-directory */
if (alias) {
dput(ctx->dentry);
ctx->dentry = dentry = alias;
}
nfs_set_verifier(dentry,
nfs_save_change_attribute(d_inode(opendata->dir)));
}
/* Parse layoutget results before we check for access */
pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
if (ret != 0)
goto out;
if (d_inode(dentry) == state->inode) {
nfs_inode_attach_open_context(ctx);
if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
nfs4_schedule_stateid_recovery(server, state);
}
out:
if (!opendata->cancelled)
nfs4_sequence_free_slot(&opendata->o_res.seq_res);
return ret;
}
/*
* Returns a referenced nfs4_state
*/
static int _nfs4_do_open(struct inode *dir,
struct nfs_open_context *ctx,
int flags,
const struct nfs4_open_createattrs *c,
int *opened)
{
struct nfs4_state_owner *sp;
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *opendata;
struct dentry *dentry = ctx->dentry;
struct rpc_cred *cred = ctx->cred;
struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
struct iattr *sattr = c->sattr;
struct nfs4_label *label = c->label;
struct nfs4_label *olabel = NULL;
int status;
/* Protect against reboot recovery conflicts */
status = -ENOMEM;
sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
if (sp == NULL) {
dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
goto out_err;
}
status = nfs4_client_recover_expired_lease(server->nfs_client);
if (status != 0)
goto err_put_state_owner;
if (d_really_is_positive(dentry))
nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
status = -ENOMEM;
if (d_really_is_positive(dentry))
claim = NFS4_OPEN_CLAIM_FH;
opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
c, claim, GFP_KERNEL);
if (opendata == NULL)
goto err_put_state_owner;
if (label) {
olabel = nfs4_label_alloc(server, GFP_KERNEL);
if (IS_ERR(olabel)) {
status = PTR_ERR(olabel);
goto err_opendata_put;
}
}
if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
if (!opendata->f_attr.mdsthreshold) {
opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
if (!opendata->f_attr.mdsthreshold)
goto err_free_label;
}
opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];