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nfs4proc.c
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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 "sysfs.h"
#include "nfs4idmap.h"
#include "nfs4session.h"
#include "fscache.h"
#include "nfs42.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 *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
static int nfs4_do_setattr(struct inode *inode, const struct 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,
const struct cred *cred,
struct nfs4_slot *slot,
bool is_privileged);
static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
const struct cred *);
static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
const struct cred *, bool);
#endif
static void nfs4_bitmask_set(__u32 bitmask[NFS4_BITMASK_SZ],
const __u32 *src, struct inode *inode,
struct nfs_server *server,
struct nfs4_label *label);
#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;
case -NFS4ERR_NOT_SAME:
return -ENOTSYNC;
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
| FATTR4_WORD2_CHANGE_ATTR_TYPE
| FATTR4_WORD2_XATTR_SUPPORT
};
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 flags)
{
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) | flags;
/* Remove the attributes over which we have full control */
dst[1] &= ~FATTR4_WORD1_RAWDEV;
if (!(cache_validity & NFS_INO_INVALID_SIZE))
dst[0] &= ~FATTR4_WORD0_SIZE;
if (!(cache_validity & NFS_INO_INVALID_CHANGE))
dst[0] &= ~FATTR4_WORD0_CHANGE;
if (!(cache_validity & NFS_INO_INVALID_MODE))
dst[1] &= ~FATTR4_WORD1_MODE;
if (!(cache_validity & NFS_INO_INVALID_OTHER))
dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
}
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_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
{
if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
fattr->pre_change_attr = version;
fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
}
}
static void nfs4_test_and_free_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
const struct 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,
const struct 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,
const struct 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_killable(long *timeout)
{
might_sleep();
freezable_schedule_timeout_killable_unsafe(
nfs4_update_delay(timeout));
if (!__fatal_signal_pending(current))
return 0;
return -EINTR;
}
static int nfs4_delay_interruptible(long *timeout)
{
might_sleep();
freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
if (!signal_pending(current))
return 0;
return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
}
static int nfs4_delay(long *timeout, bool interruptible)
{
if (interruptible)
return nfs4_delay_interruptible(timeout);
return nfs4_delay_killable(timeout);
}
static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid *stateid)
{
if (!stateid)
return NULL;
switch (stateid->type) {
case NFS4_OPEN_STATEID_TYPE:
case NFS4_LOCK_STATEID_TYPE:
case NFS4_DELEGATION_STATEID_TYPE:
return stateid;
default:
break;
}
return NULL;
}
/* 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;
struct inode *inode = exception->inode;
int ret = errorcode;
exception->delay = 0;
exception->recovering = 0;
exception->retry = 0;
stateid = nfs4_recoverable_stateid(exception->stateid);
if (stateid == NULL && state != NULL)
stateid = nfs4_recoverable_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:
case -NFS4ERR_PARTNER_NO_AUTH:
if (inode != NULL && stateid != NULL) {
nfs_inode_find_state_and_recover(inode,
stateid);
goto wait_on_recovery;
}
fallthrough;
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:
/* Handled in nfs41_sequence_process() */
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;
}
fallthrough;
case -NFS4ERR_DELAY:
nfs_inc_server_stats(server, NFSIOS_DELAY);
fallthrough;
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(&exception->timeout,
exception->interruptible);
goto out_retry;
}
if (exception->recovering) {
if (exception->task_is_privileged)
return -EDEADLOCK;
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) {
if (exception->task_is_privileged)
return -EDEADLOCK;
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 void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
u32 seqnr)
{
if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
slot->seq_nr_highest_sent = seqnr;
}
static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
u32 seqnr)
{
slot->seq_nr_highest_sent = seqnr;
slot->seq_nr_last_acked = seqnr;
}
static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
struct nfs4_slot *slot)
{
struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
if (!IS_ERR(task))
rpc_put_task_async(task);
}
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;
int status;
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) || slot->seq_done)
goto out;
session = slot->table->session;
clp = session->clp;
trace_nfs4_sequence_done(session, res);
status = res->sr_status;
if (task->tk_status == -NFS4ERR_DEADSESSION)
status = -NFS4ERR_DEADSESSION;
/* Check the SEQUENCE operation status */
switch (status) {
case 0:
/* Mark this sequence number as having been acked */
nfs4_slot_sequence_acked(slot, slot->seq_nr);
/* Update the slot's sequence and clientid lease timer */
slot->seq_done = 1;
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..
*/
nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
slot->seq_done = 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);
nfs4_slot_sequence_acked(slot, 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.
*/
nfs4_slot_sequence_acked(slot, slot->seq_nr);
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:
nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
/*
* Were one or more calls using this slot interrupted?
* If the server never received the request, then our
* transmitted slot sequence number may be too high. However,
* if the server did receive the request then it might
* accidentally give us a reply with a mismatched operation.
* We can sort this out by sending a lone sequence operation
* to the server on the same slot.
*/
if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
slot->seq_nr--;
if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
res->sr_slot = NULL;
}
goto retry_nowait;
}
/*
* RFC5661:
* A retry might be sent while the original request is
* still in progress on the replier. The replier SHOULD
* deal with the issue by returning NFS4ERR_DELAY as the
* reply to SEQUENCE or CB_SEQUENCE operation, but
* implementations MAY return NFS4ERR_SEQ_MISORDERED.
*
* Restart the search after a delay.
*/
slot->seq_nr = slot->seq_nr_highest_sent;
goto out_retry;
case -NFS4ERR_BADSESSION:
case -NFS4ERR_DEADSESSION:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
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, status);
dprintk("%s ERROR: %d Reset session\n", __func__, status);
nfs41_sequence_free_slot(res);
goto out;
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 = {