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464ee9f966
linux/fs/nfs/nfs4proc.c
Trond Myklebust 464ee9f966 NFSv4.1: Ensure that the client tracks the server target_highest_slotid 
Dynamic slot allocation in NFSv4.1 depends on the client being able to
track the server's target value for the highest slotid in the
slot table.  See the reference in Section 2.10.6.1 of RFC5661.

To avoid ordering problems in the case where 2 SEQUENCE replies contain
conflicting updates to this target value, we also introduce a generation
counter, to track whether or not an RPC containing a SEQUENCE operation
was launched before or after the last update.

Also rename the nfs4_slot_table target_max_slots field to
'target_highest_slotid' to avoid confusion with a slot
table size or number of slots.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-06 00:29:47 +01:00

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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/nfs_idmap.h>
#include <linux/sunrpc/bc_xprt.h>
#include <linux/xattr.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
#include "nfs4_fs.h"
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "callback.h"
#include "pnfs.h"
#include "netns.h"
#define NFSDBG_FACILITY NFSDBG_PROC
#define NFS4_POLL_RETRY_MIN (HZ/10)
#define NFS4_POLL_RETRY_MAX (15*HZ)
#define NFS4_MAX_LOOP_ON_RECOVER (10)
struct nfs4_opendata;
static int _nfs4_proc_open(struct nfs4_opendata *data);
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 int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
struct nfs4_state *state);
#ifdef CONFIG_NFS_V4_1
static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
#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:
return -EREMOTEIO;
case -NFS4ERR_WRONGSEC:
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_ACCESS:
return -EACCES;
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
};
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
};
static const u32 nfs4_open_noattr_bitmap[3] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_FILEID,
};
const u32 nfs4_statfs_bitmap[2] = {
FATTR4_WORD0_FILES_AVAIL
| FATTR4_WORD0_FILES_FREE
| FATTR4_WORD0_FILES_TOTAL,
FATTR4_WORD1_SPACE_AVAIL
| FATTR4_WORD1_SPACE_FREE
| FATTR4_WORD1_SPACE_TOTAL
};
const u32 nfs4_pathconf_bitmap[2] = {
FATTR4_WORD0_MAXLINK
| FATTR4_WORD0_MAXNAME,
0
};
const u32 nfs4_fsinfo_bitmap[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
};
const u32 nfs4_fs_locations_bitmap[2] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID
| FATTR4_WORD0_FS_LOCATIONS,
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
};
static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
struct nfs4_readdir_arg *readdir)
{
__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(FATTR4_WORD0_FILEID); /* bitmap */
*p++ = htonl(8); /* attribute buffer length */
p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
}
*p++ = xdr_one; /* next */
*p++ = xdr_zero; /* cookie, first word */
*p++ = xdr_two; /* cookie, second word */
*p++ = xdr_two; /* entry len */
memcpy(p, "..\0\0", 4); /* entry */
p++;
*p++ = xdr_one; /* bitmap length */
*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
*p++ = htonl(8); /* attribute buffer length */
p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
readdir->pgbase = (char *)p - (char *)start;
readdir->count -= readdir->pgbase;
kunmap_atomic(start);
}
static int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
int res;
might_sleep();
res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
nfs_wait_bit_killable, TASK_KILLABLE);
if (res)
return res;
if (clp->cl_cons_state < 0)
return clp->cl_cons_state;
return 0;
}
static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
int res = 0;
might_sleep();
if (*timeout <= 0)
*timeout = NFS4_POLL_RETRY_MIN;
if (*timeout > NFS4_POLL_RETRY_MAX)
*timeout = NFS4_POLL_RETRY_MAX;
freezable_schedule_timeout_killable(*timeout);
if (fatal_signal_pending(current))
res = -ERESTARTSYS;
*timeout <<= 1;
return res;
}
/* This is the error handling routine for processes that are allowed
* to sleep.
*/
static int nfs4_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;
struct inode *inode = exception->inode;
int ret = errorcode;
exception->retry = 0;
switch(errorcode) {
case 0:
return 0;
case -NFS4ERR_OPENMODE:
if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
nfs4_inode_return_delegation(inode);
exception->retry = 1;
return 0;
}
if (state == NULL)
break;
nfs4_schedule_stateid_recovery(server, state);
goto wait_on_recovery;
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
if (state == NULL)
break;
nfs_remove_bad_delegation(state->inode);
nfs4_schedule_stateid_recovery(server, state);
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
if (state != NULL)
nfs4_schedule_stateid_recovery(server, state);
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
nfs4_schedule_lease_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;
}
case -NFS4ERR_GRACE:
case -NFS4ERR_DELAY:
case -EKEYEXPIRED:
ret = nfs4_delay(server->client, &exception->timeout);
if (ret != 0)
break;
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:
ret = nfs4_wait_clnt_recover(clp);
if (ret == 0)
exception->retry = 1;
return ret;
}
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)
{
do_renew_lease(server->nfs_client, timestamp);
}
#if defined(CONFIG_NFS_V4_1)
/*
* nfs4_free_slot - free a slot and efficiently update slot table.
*
* freeing a slot is trivially done by clearing its respective bit
* in the bitmap.
* If the freed slotid equals highest_used_slotid we want to update it
* so that the server would be able to size down the slot table if needed,
* otherwise we know that the highest_used_slotid is still in use.
* When updating highest_used_slotid there may be "holes" in the bitmap
* so we need to scan down from highest_used_slotid to 0 looking for the now
* highest slotid in use.
* If none found, highest_used_slotid is set to NFS4_NO_SLOT.
*
* Must be called while holding tbl->slot_tbl_lock
*/
static void
nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)
{
u32 slotid = slot->slot_nr;
/* clear used bit in bitmap */
__clear_bit(slotid, tbl->used_slots);
/* update highest_used_slotid when it is freed */
if (slotid == tbl->highest_used_slotid) {
u32 new_max = find_last_bit(tbl->used_slots, slotid);
if (new_max < slotid)
tbl->highest_used_slotid = new_max;
else
tbl->highest_used_slotid = NFS4_NO_SLOT;
}
dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
slotid, tbl->highest_used_slotid);
}
bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
return true;
}
/*
* Signal state manager thread if session fore channel is drained
*/
static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
{
if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
nfs4_set_task_privileged, NULL);
return;
}
if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
return;
dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
complete(&ses->fc_slot_table.complete);
}
/*
* Signal state manager thread if session back channel is drained
*/
void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
{
if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
return;
dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
complete(&ses->bc_slot_table.complete);
}
static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
{
struct nfs4_session *session;
struct nfs4_slot_table *tbl;
if (!res->sr_slot) {
/* just wake up the next guy waiting since
* we may have not consumed a slot after all */
dprintk("%s: No slot\n", __func__);
return;
}
tbl = res->sr_slot->table;
session = tbl->session;
spin_lock(&tbl->slot_tbl_lock);
nfs4_free_slot(tbl, res->sr_slot);
nfs4_check_drain_fc_complete(session);
spin_unlock(&tbl->slot_tbl_lock);
res->sr_slot = NULL;
}
/* Update the client's idea of target_highest_slotid */
static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
u32 target_highest_slotid)
{
if (tbl->target_highest_slotid == target_highest_slotid)
return;
tbl->target_highest_slotid = target_highest_slotid;
tbl->generation++;
}
static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
struct nfs4_slot *slot,
struct nfs4_sequence_res *res)
{
spin_lock(&tbl->slot_tbl_lock);
if (tbl->generation != slot->generation)
goto out;
nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid);
out:
spin_unlock(&tbl->slot_tbl_lock);
}
static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
{
struct nfs4_session *session;
struct nfs4_slot *slot;
unsigned long timestamp;
struct nfs_client *clp;
/*
* sr_status remains 1 if an RPC level error occurred. The server
* may or may not have processed the sequence operation..
* Proceed as if the server received and processed the sequence
* operation.
*/
if (res->sr_status == 1)
res->sr_status = NFS_OK;
/* don't increment the sequence number if the task wasn't sent */
if (!RPC_WAS_SENT(task))
goto out;
slot = res->sr_slot;
session = slot->table->session;
/* Check the SEQUENCE operation status */
switch (res->sr_status) {
case 0:
/* Update the slot's sequence and clientid lease timer */
++slot->seq_nr;
timestamp = slot->renewal_time;
clp = session->clp;
do_renew_lease(clp, timestamp);
/* Check sequence flags */
if (res->sr_status_flags != 0)
nfs4_schedule_lease_recovery(clp);
nfs41_update_target_slotid(slot->table, slot, res);
break;
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;
default:
/* Just update the slot sequence no. */
++slot->seq_nr;
}
out:
/* The session may be reset by one of the error handlers. */
dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
nfs41_sequence_free_slot(res);
return 1;
out_retry:
if (!rpc_restart_call(task))
goto out;
rpc_delay(task, NFS4_POLL_RETRY_MAX);
return 0;
}
static int nfs4_sequence_done(struct rpc_task *task,
struct nfs4_sequence_res *res)
{
if (res->sr_slot == NULL)
return 1;
return nfs41_sequence_done(task, res);
}
/*
* nfs4_alloc_slot - efficiently look for a free slot
*
* nfs4_alloc_slot looks for an unset bit in the used_slots bitmap.
* If found, we mark the slot as used, update the highest_used_slotid,
* and respectively set up the sequence operation args.
*
* Note: must be called with under the slot_tbl_lock.
*/
static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
{
struct nfs4_slot *ret = NULL;
u32 slotid;
dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid,
tbl->max_slots);
slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
if (slotid >= tbl->max_slots)
goto out;
__set_bit(slotid, tbl->used_slots);
if (slotid > tbl->highest_used_slotid ||
tbl->highest_used_slotid == NFS4_NO_SLOT)
tbl->highest_used_slotid = slotid;
ret = &tbl->slots[slotid];
ret->renewal_time = jiffies;
ret->generation = tbl->generation;
out:
dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid,
ret ? ret->slot_nr : -1);
return ret;
}
static void nfs41_init_sequence(struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res, int cache_reply)
{
args->sa_slot = NULL;
args->sa_cache_this = 0;
if (cache_reply)
args->sa_cache_this = 1;
res->sr_slot = NULL;
}
int nfs41_setup_sequence(struct nfs4_session *session,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
struct rpc_task *task)
{
struct nfs4_slot *slot;
struct nfs4_slot_table *tbl;
dprintk("--> %s\n", __func__);
/* slot already allocated? */
if (res->sr_slot != NULL)
return 0;
tbl = &session->fc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
!rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
/* The state manager will wait until the slot table is empty */
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
dprintk("%s session is draining\n", __func__);
return -EAGAIN;
}
if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
!rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
dprintk("%s enforce FIFO order\n", __func__);
return -EAGAIN;
}
slot = nfs4_alloc_slot(tbl);
if (slot == NULL) {
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
dprintk("<-- %s: no free slots\n", __func__);
return -EAGAIN;
}
spin_unlock(&tbl->slot_tbl_lock);
rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
args->sa_slot = slot;
dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
slot->slot_nr, slot->seq_nr);
res->sr_slot = slot;
res->sr_status_flags = 0;
/*
* sr_status is only set in decode_sequence, and so will remain
* set to 1 if an rpc level failure occurs.
*/
res->sr_status = 1;
return 0;
}
EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
int nfs4_setup_sequence(const struct nfs_server *server,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
struct rpc_task *task)
{
struct nfs4_session *session = nfs4_get_session(server);
int ret = 0;
if (session == NULL)
goto out;
dprintk("--> %s clp %p session %p sr_slot %d\n",
__func__, session->clp, session, res->sr_slot ?
res->sr_slot->slot_nr : -1);
ret = nfs41_setup_sequence(session, args, res, task);
out:
dprintk("<-- %s status=%d\n", __func__, ret);
return ret;
}
struct nfs41_call_sync_data {
const struct nfs_server *seq_server;
struct nfs4_sequence_args *seq_args;
struct nfs4_sequence_res *seq_res;
};
static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
{
struct nfs41_call_sync_data *data = calldata;
dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
if (nfs4_setup_sequence(data->seq_server, data->seq_args,
data->seq_res, task))
return;
rpc_call_start(task);
}
static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
nfs41_call_sync_prepare(task, calldata);
}
static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
{
struct nfs41_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 const struct rpc_call_ops nfs41_call_priv_sync_ops = {
.rpc_call_prepare = nfs41_call_priv_sync_prepare,
.rpc_call_done = nfs41_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 privileged)
{
int ret;
struct rpc_task *task;
struct nfs41_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 = &nfs41_call_sync_ops,
.callback_data = &data
};
if (privileged)
task_setup.callback_ops = &nfs41_call_priv_sync_ops;
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_session(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)
{
nfs41_init_sequence(args, res, cache_reply);
return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
}
#else
static inline
void nfs41_init_sequence(struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res, int cache_reply)
{
}
static int nfs4_sequence_done(struct rpc_task *task,
struct nfs4_sequence_res *res)
{
return 1;
}
#endif /* CONFIG_NFS_V4_1 */
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)
{
nfs41_init_sequence(args, res, cache_reply);
return rpc_call_sync(clnt, msg, 0);
}
static inline
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)
{
return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
args, res, cache_reply);
}
static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
{
struct nfs_inode *nfsi = NFS_I(dir);
spin_lock(&dir->i_lock);
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
if (!cinfo->atomic || cinfo->before != dir->i_version)
nfs_force_lookup_revalidate(dir);
dir->i_version = cinfo->after;
spin_unlock(&dir->i_lock);
}
struct nfs4_opendata {
struct kref kref;
struct nfs_openargs o_arg;
struct nfs_openres o_res;
struct nfs_open_confirmargs c_arg;
struct nfs_open_confirmres c_res;
struct nfs4_string owner_name;
struct nfs4_string group_name;
struct nfs_fattr f_attr;
struct dentry *dir;
struct dentry *dentry;
struct nfs4_state_owner *owner;
struct nfs4_state *state;
struct iattr attrs;
unsigned long timestamp;
unsigned int rpc_done : 1;
int rpc_status;
int cancelled;
};
static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
p->o_res.f_attr = &p->f_attr;
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 iattr *attrs,
gfp_t gfp_mask)
{
struct dentry *parent = dget_parent(dentry);
struct inode *dir = parent->d_inode;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *p;
p = kzalloc(sizeof(*p), gfp_mask);
if (p == NULL)
goto err;
p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
if (p->o_arg.seqid == NULL)
goto err_free;
nfs_sb_active(dentry->d_sb);
p->dentry = dget(dentry);
p->dir = parent;
p->owner = sp;
atomic_inc(&sp->so_count);
p->o_arg.fh = NFS_FH(dir);
p->o_arg.open_flags = flags;
p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
/* 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 */
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 = server->attr_bitmask;
p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
if (attrs != NULL && attrs->ia_valid != 0) {
__be32 verf[2];
p->o_arg.u.attrs = &p->attrs;
memcpy(&p->attrs, attrs, sizeof(p->attrs));
verf[0] = jiffies;
verf[1] = current->pid;
memcpy(p->o_arg.u.verifier.data, verf,
sizeof(p->o_arg.u.verifier.data));
}
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:
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;
nfs_free_seqid(p->o_arg.seqid);
if (p->state != NULL)
nfs4_put_open_state(p->state);
nfs4_put_state_owner(p->owner);
dput(p->dir);
dput(p->dentry);
nfs_sb_deactive(sb);
nfs_fattr_free_names(&p->f_attr);
kfree(p);
}
static void nfs4_opendata_put(struct nfs4_opendata *p)
{
if (p != NULL)
kref_put(&p->kref, nfs4_opendata_free);
}
static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
{
int ret;
ret = rpc_wait_for_completion_task(task);
return ret;
}
static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
{
int ret = 0;
if (open_mode & (O_EXCL|O_TRUNC))
goto out;
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)
{
if (delegation == NULL)
return 0;
if ((delegation->type & fmode) != fmode)
return 0;
if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
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);
}
static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
{
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, stateid);
nfs4_stateid_copy(&state->open_stateid, stateid);
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);
}
}
static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
{
write_seqlock(&state->seqlock);
nfs_set_open_stateid_locked(state, stateid, fmode);
write_sequnlock(&state->seqlock);
}
static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, 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);
if (deleg_stateid != NULL) {
nfs4_stateid_copy(&state->stateid, deleg_stateid);
set_bit(NFS_DELEGATED_STATE, &state->flags);
}
if (open_stateid != NULL)
nfs_set_open_stateid_locked(state, open_stateid, fmode);
write_sequnlock(&state->seqlock);
spin_lock(&state->owner->so_lock);
update_open_stateflags(state, fmode);
spin_unlock(&state->owner->so_lock);
}
static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
{
struct nfs_inode *nfsi = NFS_I(state->inode);
struct nfs_delegation *deleg_cur;
int ret = 0;
fmode &= (FMODE_READ|FMODE_WRITE);
rcu_read_lock();
deleg_cur = rcu_dereference(nfsi->delegation);
if (deleg_cur == NULL)
goto no_delegation;
spin_lock(&deleg_cur->lock);
if (nfsi->delegation != deleg_cur ||
(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);
__update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
ret = 1;
no_delegation_unlock:
spin_unlock(&deleg_cur->lock);
no_delegation:
rcu_read_unlock();
if (!ret && open_stateid != NULL) {
__update_open_stateid(state, open_stateid, NULL, fmode);
ret = 1;
}
return ret;
}
static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
{
struct nfs_delegation *delegation;
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_inode *nfsi = NFS_I(state->inode);
struct nfs_delegation *delegation;
int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
fmode_t fmode = opendata->o_arg.fmode;
nfs4_stateid stateid;
int ret = -EAGAIN;
for (;;) {
if (can_open_cached(state, fmode, open_mode)) {
spin_lock(&state->owner->so_lock);
if (can_open_cached(state, fmode, open_mode)) {
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 = rcu_dereference(nfsi->delegation);
if (!can_open_delegated(delegation, fmode)) {
rcu_read_unlock();
break;
}
/* Save the delegation */
nfs4_stateid_copy(&stateid, &delegation->stateid);
rcu_read_unlock();
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();
if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
"returning a delegation for "
"OPEN(CLAIM_DELEGATE_CUR)\n",
clp->cl_hostname);
} else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
nfs_inode_set_delegation(state->inode,
data->owner->so_cred,
&data->o_res);
else
nfs_inode_reclaim_delegation(state->inode,
data->owner->so_cred,
&data->o_res);
}
/*
* 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) {
ret = data->rpc_status;
goto err;
}
ret = -ESTALE;
if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
!(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
!(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
goto err;
ret = -ENOMEM;
state = nfs4_get_open_state(inode, data->owner);
if (state == NULL)
goto err;
ret = nfs_refresh_inode(inode, &data->f_attr);
if (ret)
goto err;
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);
return state;
err:
return ERR_PTR(ret);
}
static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
struct inode *inode;
struct nfs4_state *state = NULL;
int ret;
if (!data->rpc_done) {
state = nfs4_try_open_cached(data);
goto out;
}
ret = -EAGAIN;
if (!(data->f_attr.valid & NFS_ATTR_FATTR))
goto err;
inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
ret = PTR_ERR(inode);
if (IS_ERR(inode))
goto err;
ret = -ENOMEM;
state = nfs4_get_open_state(inode, data->owner);
if (state == NULL)
goto err_put_inode;
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);
iput(inode);
out:
return state;
err_put_inode:
iput(inode);
err:
return ERR_PTR(ret);
}
static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
return _nfs4_opendata_reclaim_to_nfs4_state(data);
return _nfs4_opendata_to_nfs4_state(data);
}
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)
{
struct nfs4_opendata *opendata;
opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, 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 **res)
{
struct nfs4_state *newstate;
int ret;
opendata->o_arg.open_flags = 0;
opendata->o_arg.fmode = fmode;
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);
nfs4_close_state(newstate, fmode);
*res = newstate;
return 0;
}
static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
{
struct nfs4_state *newstate;
int ret;
/* memory barrier prior to reading state->n_* */
clear_bit(NFS_DELEGATED_STATE, &state->flags);
smp_rmb();
if (state->n_rdwr != 0) {
clear_bit(NFS_O_RDWR_STATE, &state->flags);
ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
if (ret != 0)
return ret;
if (newstate != state)
return -ESTALE;
}
if (state->n_wronly != 0) {
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
if (ret != 0)
return ret;
if (newstate != state)
return -ESTALE;
}
if (state->n_rdonly != 0) {
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
if (ret != 0)
return ret;
if (newstate != state)
return -ESTALE;
}
/*
* 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);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
opendata->o_arg.fh = NFS_FH(state->inode);
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);
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 PTR_ERR(ctx);
ret = nfs4_do_open_reclaim(ctx, state);
put_nfs_open_context(ctx);
return ret;
}
static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
{
struct nfs4_opendata *opendata;
int ret;
opendata = nfs4_open_recoverdata_alloc(ctx, state);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
ret = nfs4_open_recover(opendata, state);
nfs4_opendata_put(opendata);
return ret;
}
int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
{
struct nfs4_exception exception = { };
struct nfs_server *server = NFS_SERVER(state->inode);
int err;
do {
err = _nfs4_open_delegation_recall(ctx, state, stateid);
switch (err) {
case 0:
case -ENOENT:
case -ESTALE:
goto out;
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);
goto out;
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
/* Don't recall a delegation if it was lost */
nfs4_schedule_lease_recovery(server->nfs_client);
goto out;
case -ERESTARTSYS:
/*
* The show must go on: exit, but mark the
* stateid as needing recovery.
*/
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
nfs_inode_find_state_and_recover(state->inode,
stateid);
nfs4_schedule_stateid_recovery(server, state);
case -EKEYEXPIRED:
/*
* User RPCSEC_GSS context has expired.
* We cannot recover this stateid now, so
* skip it and allow recovery thread to
* proceed.
*/
case -ENOMEM:
err = 0;
goto out;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
out:
return err;
}
static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
{
struct nfs4_opendata *data = calldata;
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 = 1;
}
}
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 == 0)
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_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(data->dir->d_inode);
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;
kref_get(&data->kref);
data->rpc_done = 0;
data->rpc_status = 0;
data->timestamp = jiffies;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = nfs4_wait_for_completion_rpc_task(task);
if (status != 0) {
data->cancelled = 1;
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;
if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
return;
/*
* 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))
goto out_no_action;
rcu_read_lock();
delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
can_open_delegated(delegation, data->o_arg.fmode))
goto unlock_no_action;
rcu_read_unlock();
}
/* Update client id. */
data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
}
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->o_arg.server,
&data->o_arg.seq_args,
&data->o_res.seq_res,
task) != 0)
nfs_release_seqid(data->o_arg.seqid);
else
rpc_call_start(task);
return;
unlock_no_action:
rcu_read_unlock();
out_no_action:
task->tk_action = NULL;
}
static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
nfs4_open_prepare(task, calldata);
}
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_done(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 = 1;
}
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 == 0)
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 const struct rpc_call_ops nfs4_recover_open_ops = {
.rpc_call_prepare = nfs4_recover_open_prepare,
.rpc_call_done = nfs4_open_done,
.rpc_release = nfs4_open_release,
};
static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
{
struct inode *dir = data->dir->d_inode;
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;
nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
kref_get(&data->kref);
data->rpc_done = 0;
data->rpc_status = 0;
data->cancelled = 0;
if (isrecover)
task_setup_data.callback_ops = &nfs4_recover_open_ops;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = nfs4_wait_for_completion_rpc_task(task);
if (status != 0) {
data->cancelled = 1;
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 = data->dir->d_inode;
struct nfs_openres *o_res = &data->o_res;
int status;
status = nfs4_run_open_task(data, 1);
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);
if (status != 0)
return status;
}
return status;
}
static int nfs4_opendata_access(struct rpc_cred *cred,
struct nfs4_opendata *opendata,
struct nfs4_state *state, fmode_t fmode)
{
struct nfs_access_entry cache;
u32 mask;
/* 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;
/* don't check MAY_WRITE - a newly created file may not have
* write mode bits, but POSIX allows the creating process to write */
if (fmode & FMODE_READ)
mask |= MAY_READ;
if (fmode & FMODE_EXEC)
mask |= MAY_EXEC;
cache.cred = cred;
cache.jiffies = jiffies;
nfs_access_set_mask(&cache, opendata->o_res.access_result);
nfs_access_add_cache(state->inode, &cache);
if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
return 0;
/* even though OPEN succeeded, access is denied. Close the file */
nfs4_close_state(state, fmode);
return -EACCES;
}
/*
* Note: On error, nfs4_proc_open will free the struct nfs4_opendata
*/
static int _nfs4_proc_open(struct nfs4_opendata *data)
{
struct inode *dir = data->dir->d_inode;
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, 0);
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)
update_changeattr(dir, &o_res->cinfo);
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_proc_getattr(server, &o_res->fh, o_res->f_attr);
return 0;
}
static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
{
unsigned int loop;
int ret;
for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
ret = nfs4_wait_clnt_recover(clp);
if (ret != 0)
break;
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
!test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
break;
nfs4_schedule_state_manager(clp);
ret = -EIO;
}
return ret;
}
static int nfs4_recover_expired_lease(struct nfs_server *server)
{
return nfs4_client_recover_expired_lease(server->nfs_client);
}
/*
* 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);
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);
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 PTR_ERR(ctx);
ret = nfs4_do_open_expired(ctx, state);
put_nfs_open_context(ctx);
return ret;
}
#if defined(CONFIG_NFS_V4_1)
static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
nfs4_stateid *stateid = &state->stateid;
int status;
/* If a state reset has been done, test_stateid is unneeded */
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
return;
status = nfs41_test_stateid(server, stateid);
if (status != NFS_OK) {
/* Free the stateid unless the server explicitly
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server, stateid);
nfs_remove_bad_delegation(state->inode);
write_seqlock(&state->seqlock);
nfs4_stateid_copy(&state->stateid, &state->open_stateid);
write_sequnlock(&state->seqlock);
clear_bit(NFS_DELEGATED_STATE, &state->flags);
}
}
/**
* 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;
int status;
/* If a state reset has been done, test_stateid is unneeded */
if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
(test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
(test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
return -NFS4ERR_BAD_STATEID;
status = nfs41_test_stateid(server, stateid);
if (status != NFS_OK) {
/* Free the stateid unless the server explicitly
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server, 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);
}
return status;
}
static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
int status;
nfs41_clear_delegation_stateid(state);
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 inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
{
if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
!(sattr->ia_valid & ATTR_ATIME_SET))
sattr->ia_valid |= ATTR_ATIME;
if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
!(sattr->ia_valid & ATTR_MTIME_SET))
sattr->ia_valid |= ATTR_MTIME;
}
/*
* Returns a referenced nfs4_state
*/
static int _nfs4_do_open(struct inode *dir,
struct dentry *dentry,
fmode_t fmode,
int flags,
struct iattr *sattr,
struct rpc_cred *cred,
struct nfs4_state **res,
struct nfs4_threshold **ctx_th)
{
struct nfs4_state_owner *sp;
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *opendata;
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_recover_expired_lease(server);
if (status != 0)
goto err_put_state_owner;
if (dentry->d_inode != NULL)
nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
status = -ENOMEM;
opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
if (opendata == NULL)
goto err_put_state_owner;
if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
if (!opendata->f_attr.mdsthreshold)
goto err_opendata_put;
opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
}
if (dentry->d_inode != NULL)
opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
status = _nfs4_proc_open(opendata);
if (status != 0)
goto err_opendata_put;
state = nfs4_opendata_to_nfs4_state(opendata);
status = PTR_ERR(state);
if (IS_ERR(state))
goto err_opendata_put;
if (server->caps & NFS_CAP_POSIX_LOCK)
set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
status = nfs4_opendata_access(cred, opendata, state, fmode);
if (status != 0)
goto err_opendata_put;
if (opendata->o_arg.open_flags & O_EXCL) {
nfs4_exclusive_attrset(opendata, sattr);
nfs_fattr_init(opendata->o_res.f_attr);
status = nfs4_do_setattr(state->inode, cred,
opendata->o_res.f_attr, sattr,
state);
if (status == 0)
nfs_setattr_update_inode(state->inode, sattr);
nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
}
if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
*ctx_th = opendata->f_attr.mdsthreshold;
else
kfree(opendata->f_attr.mdsthreshold);
opendata->f_attr.mdsthreshold = NULL;
nfs4_opendata_put(opendata);
nfs4_put_state_owner(sp);
*res = state;
return 0;
err_opendata_put:
kfree(opendata->f_attr.mdsthreshold);
nfs4_opendata_put(opendata);
err_put_state_owner:
nfs4_put_state_owner(sp);
out_err:
*res = NULL;
return status;
}
static struct nfs4_state *nfs4_do_open(struct inode *dir,
struct dentry *dentry,
fmode_t fmode,
int flags,
struct iattr *sattr,
struct rpc_cred *cred,
struct nfs4_threshold **ctx_th)
{
struct nfs4_exception exception = { };
struct nfs4_state *res;
int status;
fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
do {
status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
&res, ctx_th);
if (status == 0)
break;
/* NOTE: BAD_SEQID means the server and client disagree about the
* book-keeping w.r.t. state-changing operations
* (OPEN/CLOSE/LOCK/LOCKU...)
* It is actually a sign of a bug on the client or on the server.
*
* If we receive a BAD_SEQID error in the particular case of
* doing an OPEN, we assume that nfs_increment_open_seqid() will
* have unhashed the old state_owner for us, and that we can
* therefore safely retry using a new one. We should still warn
* the user though...
*/
if (status == -NFS4ERR_BAD_SEQID) {
pr_warn_ratelimited("NFS: v4 server %s "
" returned a bad sequence-id error!\n",
NFS_SERVER(dir)->nfs_client->cl_hostname);
exception.retry = 1;
continue;
}
/*
* BAD_STATEID on OPEN means that the server cancelled our
* state before it received the OPEN_CONFIRM.
* Recover by retrying the request as per the discussion
* on Page 181 of RFC3530.
*/
if (status == -NFS4ERR_BAD_STATEID) {
exception.retry = 1;
continue;
}
if (status == -EAGAIN) {
/* We must have found a delegation */
exception.retry = 1;
continue;
}
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
status, &exception));
} while (exception.retry);
return res;
}
static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_setattrargs arg = {
.fh = NFS_FH(inode),
.iap = sattr,
.server = server,
.bitmask = server->attr_bitmask,
};
struct nfs_setattrres res = {
.fattr = fattr,
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = cred,
};
unsigned long timestamp = jiffies;
int status;
nfs_fattr_init(fattr);
if (state != NULL) {
struct nfs_lockowner lockowner = {
.l_owner = current->files,
.l_pid = current->tgid,
};
nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
&lockowner);
} else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
FMODE_WRITE)) {
/* Use that stateid */
} else
nfs4_stateid_copy(&arg.stateid, &zero_stateid);
status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
if (status == 0 && state != NULL)
renew_lease(server, timestamp);
return status;
}
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_exception exception = {
.state = state,
.inode = inode,
};
int err;
do {
err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
switch (err) {
case -NFS4ERR_OPENMODE:
if (state && !(state->state & FMODE_WRITE)) {
err = -EBADF;
if (sattr->ia_valid & ATTR_OPEN)
err = -EACCES;
goto out;
}
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
out:
return err;
}
struct nfs4_closedata {
struct inode *inode;
struct nfs4_state *state;
struct nfs_closeargs arg;
struct nfs_closeres res;
struct nfs_fattr fattr;
unsigned long timestamp;
bool roc;
u32 roc_barrier;
};
static void nfs4_free_closedata(void *data)
{
struct nfs4_closedata *calldata = data;
struct nfs4_state_owner *sp = calldata->state->owner;
struct super_block *sb = calldata->state->inode->i_sb;
if (calldata->roc)
pnfs_roc_release(calldata->state->inode);
nfs4_put_open_state(calldata->state);
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_state_owner(sp);
nfs_sb_deactive_async(sb);
kfree(calldata);
}
static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
fmode_t fmode)
{
spin_lock(&state->owner->so_lock);
if (!(fmode & FMODE_READ))
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
if (!(fmode & FMODE_WRITE))
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
clear_bit(NFS_O_RDWR_STATE, &state->flags);
spin_unlock(&state->owner->so_lock);
}
static void nfs4_close_done(struct rpc_task *task, void *data)
{
struct nfs4_closedata *calldata = data;
struct nfs4_state *state = calldata->state;
struct nfs_server *server = NFS_SERVER(calldata->inode);
dprintk("%s: begin!\n", __func__);
if (!nfs4_sequence_done(task, &calldata->res.seq_res))
return;
/* hmm. we are done with the inode, and in the process of freeing
* the state_owner. we keep this around to process errors
*/
switch (task->tk_status) {
case 0:
if (calldata->roc)
pnfs_roc_set_barrier(state->inode,
calldata->roc_barrier);
nfs_set_open_stateid(state, &calldata->res.stateid, 0);
renew_lease(server, calldata->timestamp);
nfs4_close_clear_stateid_flags(state,
calldata->arg.fmode);
break;
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_OLD_STATEID:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_EXPIRED:
if (calldata->arg.fmode == 0)
break;
default:
if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
rpc_restart_call_prepare(task);
}
nfs_release_seqid(calldata->arg.seqid);
nfs_refresh_inode(calldata->inode, calldata->res.fattr);
dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
}
static void nfs4_close_prepare(struct rpc_task *task, void *data)
{
struct nfs4_closedata *calldata = data;
struct nfs4_state *state = calldata->state;
struct inode *inode = calldata->inode;
int call_close = 0;
dprintk("%s: begin!\n", __func__);
if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
return;
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
spin_lock(&state->owner->so_lock);
/* Calculate the change in open mode */
if (state->n_rdwr == 0) {
if (state->n_rdonly == 0) {
call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
calldata->arg.fmode &= ~FMODE_READ;
}
if (state->n_wronly == 0) {
call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
calldata->arg.fmode &= ~FMODE_WRITE;
}
}
spin_unlock(&state->owner->so_lock);
if (!call_close) {
/* Note: exit _without_ calling nfs4_close_done */
task->tk_action = NULL;
goto out;
}
if (calldata->arg.fmode == 0) {
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
if (calldata->roc &&
pnfs_roc_drain(inode, &calldata->roc_barrier, task))
goto out;
}
nfs_fattr_init(calldata->res.fattr);
calldata->timestamp = jiffies;
if (nfs4_setup_sequence(NFS_SERVER(inode),
&calldata->arg.seq_args,
&calldata->res.seq_res,
task) != 0)
nfs_release_seqid(calldata->arg.seqid);
else
rpc_call_start(task);
out:
dprintk("%s: done!\n", __func__);
}
static const struct rpc_call_ops nfs4_close_ops = {
.rpc_call_prepare = nfs4_close_prepare,
.rpc_call_done = nfs4_close_done,
.rpc_release = nfs4_free_closedata,
};
/*
* It is possible for data to be read/written from a mem-mapped file
* after the sys_close call (which hits the vfs layer as a flush).
* This means that we can't safely call nfsv4 close on a file until
* the inode is cleared. This in turn means that we are not good
* NFSv4 citizens - we do not indicate to the server to update the file's
* share state even when we are done with one of the three share
* stateid's in the inode.
*
* NOTE: Caller must be holding the sp->so_owner semaphore!
*/
int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_closedata *calldata;
struct nfs4_state_owner *sp = state->owner;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
.rpc_cred = state->owner->so_cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs4_close_ops,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
int status = -ENOMEM;
calldata = kzalloc(sizeof(*calldata), gfp_mask);
if (calldata == NULL)
goto out;
nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
calldata->inode = state->inode;
calldata->state = state;
calldata->arg.fh = NFS_FH(state->inode);
calldata->arg.stateid = &state->open_stateid;
/* Serialization for the sequence id */
calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
if (calldata->arg.seqid == NULL)
goto out_free_calldata;
calldata->arg.fmode = 0;
calldata->arg.bitmask = server->cache_consistency_bitmask;
calldata->res.fattr = &calldata->fattr;
calldata->res.seqid = calldata->arg.seqid;
calldata->res.server = server;
calldata->roc = pnfs_roc(state->inode);
nfs_sb_active(calldata->inode->i_sb);
msg.rpc_argp = &calldata->arg;
msg.rpc_resp = &calldata->res;
task_setup_data.callback_data = calldata;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = 0;
if (wait)
status = rpc_wait_for_completion_task(task);
rpc_put_task(task);
return status;
out_free_calldata:
kfree(calldata);
out:
nfs4_put_open_state(state);
nfs4_put_state_owner(sp);
return status;
}
static struct inode *
nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
{
struct nfs4_state *state;
/* Protect against concurrent sillydeletes */
state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
ctx->cred, &ctx->mdsthreshold);
if (IS_ERR(state))
return ERR_CAST(state);
ctx->state = state;
return igrab(state->inode);
}
static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
{
if (ctx->state == NULL)
return;
if (is_sync)
nfs4_close_sync(ctx->state, ctx->mode);
else
nfs4_close_state(ctx->state, ctx->mode);
}
static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
struct nfs4_server_caps_arg args = {
.fhandle = fhandle,
};
struct nfs4_server_caps_res res = {};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
if (status == 0) {
memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
NFS_CAP_CTIME|NFS_CAP_MTIME);
if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
server->caps |= NFS_CAP_ACLS;
if (res.has_links != 0)
server->caps |= NFS_CAP_HARDLINKS;
if (res.has_symlinks != 0)
server->caps |= NFS_CAP_SYMLINKS;
if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
server->caps |= NFS_CAP_FILEID;
if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
server->caps |= NFS_CAP_MODE;
if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
server->caps |= NFS_CAP_NLINK;
if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
server->caps |= NFS_CAP_OWNER;
if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
server->caps |= NFS_CAP_OWNER_GROUP;
if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
server->caps |= NFS_CAP_ATIME;
if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
server->caps |= NFS_CAP_CTIME;
if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
server->caps |= NFS_CAP_MTIME;
memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
server->acl_bitmask = res.acl_bitmask;
server->fh_expire_type = res.fh_expire_type;
}
return status;
}
int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_server_capabilities(server, fhandle),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
struct nfs4_lookup_root_arg args = {
.bitmask = nfs4_fattr_bitmap,
};
struct nfs4_lookup_res res = {
.server = server,
.fattr = info->fattr,
.fh = fhandle,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
.rpc_argp = &args,
.rpc_resp = &res,
};
nfs_fattr_init(info->fattr);
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_lookup_root(server, fhandle, info);
switch (err) {
case 0:
case -NFS4ERR_WRONGSEC:
goto out;
default:
err = nfs4_handle_exception(server, err, &exception);
}
} while (exception.retry);
out:
return err;
}
static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info, rpc_authflavor_t flavor)
{
struct rpc_auth *auth;
int ret;
auth = rpcauth_create(flavor, server->client);
if (IS_ERR(auth)) {
ret = -EIO;
goto out;
}
ret = nfs4_lookup_root(server, fhandle, info);
out:
return ret;
}
static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
int i, len, status = 0;
rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
if (len < 0)
return len;
for (i = 0; i < len; i++) {
/* AUTH_UNIX is the default flavor if none was specified,
* thus has already been tried. */
if (flav_array[i] == RPC_AUTH_UNIX)
continue;
status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
continue;
break;
}
/*
* -EACCESS could mean that the user doesn't have correct permissions
* to access the mount. It could also mean that we tried to mount
* with a gss auth flavor, but rpc.gssd isn't running. Either way,
* existing mount programs don't handle -EACCES very well so it should
* be mapped to -EPERM instead.
*/
if (status == -EACCES)
status = -EPERM;
return status;
}
/*
* get the file handle for the "/" directory on the server
*/
int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
int minor_version = server->nfs_client->cl_minorversion;
int status = nfs4_lookup_root(server, fhandle, info);
if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
/*
* A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
* by nfs4_map_errors() as this function exits.
*/
status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
if (status == 0)
status = nfs4_server_capabilities(server, fhandle);
if (status == 0)
status = nfs4_do_fsinfo(server, fhandle, info);
return nfs4_map_errors(status);
}
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
struct nfs_fsinfo *info)
{
int error;
struct nfs_fattr *fattr = info->fattr;
error = nfs4_server_capabilities(server, mntfh);
if (error < 0) {
dprintk("nfs4_get_root: getcaps error = %d\n", -error);
return error;
}
error = nfs4_proc_getattr(server, mntfh, fattr);
if (error < 0) {
dprintk("nfs4_get_root: getattr error = %d\n", -error);
return error;
}
if (fattr->valid & NFS_ATTR_FATTR_FSID &&
!nfs_fsid_equal(&server->fsid, &fattr->fsid))
memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
return error;
}
/*
* Get locations and (maybe) other attributes of a referral.
* Note that we'll actually follow the referral later when
* we detect fsid mismatch in inode revalidation
*/
static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
const struct qstr *name, struct nfs_fattr *fattr,
struct nfs_fh *fhandle)
{
int status = -ENOMEM;
struct page *page = NULL;
struct nfs4_fs_locations *locations = NULL;
page = alloc_page(GFP_KERNEL);
if (page == NULL)
goto out;
locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
if (locations == NULL)
goto out;
status = nfs4_proc_fs_locations(client, dir, name, locations, page);
if (status != 0)
goto out;
/* Make sure server returned a different fsid for the referral */
if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
dprintk("%s: server did not return a different fsid for"
" a referral at %s\n", __func__, name->name);
status = -EIO;
goto out;
}
/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
nfs_fixup_referral_attributes(&locations->fattr);
/* replace the lookup nfs_fattr with the locations nfs_fattr */
memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
memset(fhandle, 0, sizeof(struct nfs_fh));
out:
if (page)
__free_page(page);
kfree(locations);
return status;
}
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_getattr_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct nfs4_getattr_res res = {
.fattr = fattr,
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
.rpc_argp = &args,
.rpc_resp = &res,
};
nfs_fattr_init(fattr);
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_getattr(server, fhandle, fattr),
&exception);
} while (exception.retry);
return err;
}
/*
* The file is not closed if it is opened due to the a request to change
* the size of the file. The open call will not be needed once the
* VFS layer lookup-intents are implemented.
*
* Close is called when the inode is destroyed.
* If we haven't opened the file for O_WRONLY, we
* need to in the size_change case to obtain a stateid.
*
* Got race?
* Because OPEN is always done by name in nfsv4, it is
* possible that we opened a different file by the same
* name. We can recognize this race condition, but we
* can't do anything about it besides returning an error.
*
* This will be fixed with VFS changes (lookup-intent).
*/
static int
nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
struct iattr *sattr)
{
struct inode *inode = dentry->d_inode;
struct rpc_cred *cred = NULL;
struct nfs4_state *state = NULL;
int status;
if (pnfs_ld_layoutret_on_setattr(inode))
pnfs_return_layout(inode);
nfs_fattr_init(fattr);
/* Deal with open(O_TRUNC) */
if (sattr->ia_valid & ATTR_OPEN)
sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
/* Optimization: if the end result is no change, don't RPC */
if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
return 0;
/* Search for an existing open(O_WRITE) file */
if (sattr->ia_valid & ATTR_FILE) {
struct nfs_open_context *ctx;
ctx = nfs_file_open_context(sattr->ia_file);
if (ctx) {
cred = ctx->cred;
state = ctx->state;
}
}
status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
if (status == 0)
nfs_setattr_update_inode(inode, sattr);
return status;
}
static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
const struct qstr *name, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs_server *server = NFS_SERVER(dir);
int status;
struct nfs4_lookup_arg args = {
.bitmask = server->attr_bitmask,
.dir_fh = NFS_FH(dir),
.name = name,
};
struct nfs4_lookup_res res = {
.server = server,
.fattr = fattr,
.fh = fhandle,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
.rpc_argp = &args,
.rpc_resp = &res,
};
nfs_fattr_init(fattr);
dprintk("NFS call lookup %s\n", name->name);
status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
dprintk("NFS reply lookup: %d\n", status);
return status;
}
static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
{
fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
fattr->nlink = 2;
}
static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
struct qstr *name, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
struct rpc_clnt *client = *clnt;
int err;
do {
err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
switch (err) {
case -NFS4ERR_BADNAME:
err = -ENOENT;
goto out;
case -NFS4ERR_MOVED:
err = nfs4_get_referral(client, dir, name, fattr, fhandle);
goto out;
case -NFS4ERR_WRONGSEC:
err = -EPERM;
if (client != *clnt)
goto out;
client = nfs4_create_sec_client(client, dir, name);
if (IS_ERR(client))
return PTR_ERR(client);
exception.retry = 1;
break;
default:
err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
}
} while (exception.retry);
out:
if (err == 0)
*clnt = client;
else if (client != *clnt)
rpc_shutdown_client(client);
return err;
}
static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
int status;
struct rpc_clnt *client = NFS_CLIENT(dir);
status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
if (client != NFS_CLIENT(dir)) {
rpc_shutdown_client(client);
nfs_fixup_secinfo_attributes(fattr);
}
return status;
}
struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
int status;
struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
if (status < 0) {
rpc_shutdown_client(client);
return ERR_PTR(status);
}
return client;
}
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_accessargs args = {
.fh = NFS_FH(inode),
.bitmask = server->cache_consistency_bitmask,
};
struct nfs4_accessres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = entry->cred,
};
int mode = entry->mask;
int status;
/*
* Determine which access bits we want to ask for...
*/
if (mode & MAY_READ)
args.access |= NFS4_ACCESS_READ;
if (S_ISDIR(inode->i_mode)) {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_LOOKUP;
} else {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_EXECUTE;
}
res.fattr = nfs_alloc_fattr();
if (res.fattr == NULL)
return -ENOMEM;
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
if (!status) {
nfs_access_set_mask(entry, res.access);
nfs_refresh_inode(inode, res.fattr);
}
nfs_free_fattr(res.fattr);
return status;
}
static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_access(inode, entry),
&exception);
} while (exception.retry);
return err;
}
/*
* TODO: For the time being, we don't try to get any attributes
* along with any of the zero-copy operations READ, READDIR,
* READLINK, WRITE.
*
* In the case of the first three, we want to put the GETATTR
* after the read-type operation -- this is because it is hard
* to predict the length of a GETATTR response in v4, and thus
* align the READ data correctly. This means that the GETATTR
* may end up partially falling into the page cache, and we should
* shift it into the 'tail' of the xdr_buf before processing.
* To do this efficiently, we need to know the total length
* of data received, which doesn't seem to be available outside
* of the RPC layer.
*
* In the case of WRITE, we also want to put the GETATTR after
* the operation -- in this case because we want to make sure
* we get the post-operation mtime and size.
*
* Both of these changes to the XDR layer would in fact be quite
* minor, but I decided to leave them for a subsequent patch.
*/
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
unsigned int pgbase, unsigned int pglen)
{
struct nfs4_readlink args = {
.fh = NFS_FH(inode),
.pgbase = pgbase,
.pglen = pglen,
.pages = &page,
};
struct nfs4_readlink_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
.rpc_argp = &args,
.rpc_resp = &res,
};
return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_proc_readlink(struct inode *inode, struct page *page,
unsigned int pgbase, unsigned int pglen)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_readlink(inode, page, pgbase, pglen),
&exception);
} while (exception.retry);
return err;
}
/*
* This is just for mknod. open(O_CREAT) will always do ->open_context().
*/
static int
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags)
{
struct nfs_open_context *ctx;
struct nfs4_state *state;
int status = 0;
ctx = alloc_nfs_open_context(dentry, FMODE_READ);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
sattr->ia_mode &= ~current_umask();
state = nfs4_do_open(dir, dentry, ctx->mode,
flags, sattr, ctx->cred,
&ctx->mdsthreshold);
d_drop(dentry);
if (IS_ERR(state)) {
status = PTR_ERR(state);
goto out;
}
d_add(dentry, igrab(state->inode));
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
ctx->state = state;
out:
put_nfs_open_context(ctx);
return status;
}
static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_removeargs args = {
.fh = NFS_FH(dir),
.name = *name,
};
struct nfs_removeres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
if (status == 0)
update_changeattr(dir, &res.cinfo);
return status;
}
static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_remove(dir, name),
&exception);
} while (exception.retry);
return err;
}
static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_removeargs *args = msg->rpc_argp;
struct nfs_removeres *res = msg->rpc_resp;
res->server = server;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
}
static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
{
if (nfs4_setup_sequence(NFS_SERVER(data->dir),
&data->args.seq_args,
&data->res.seq_res,
task))
return;
rpc_call_start(task);
}
static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
struct nfs_removeres *res = task->tk_msg.rpc_resp;
if (!nfs4_sequence_done(task, &res->seq_res))
return 0;
if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
return 0;
update_changeattr(dir, &res->cinfo);
return 1;
}
static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
{
struct nfs_server *server = NFS_SERVER(dir);
struct nfs_renameargs *arg = msg->rpc_argp;
struct nfs_renameres *res = msg->rpc_resp;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
res->server = server;
nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
}
static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
{
if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
&data->args.seq_args,
&data->res.seq_res,
task))
return;
rpc_call_start(task);
}
static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
struct inode *new_dir)
{
struct nfs_renameres *res = task->tk_msg.rpc_resp;
if (!nfs4_sequence_done(task, &res->seq_res))
return 0;
if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
return 0;
update_changeattr(old_dir, &res->old_cinfo);
update_changeattr(new_dir, &res->new_cinfo);
return 1;
}
static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
struct inode *new_dir, struct qstr *new_name)
{
struct nfs_server *server = NFS_SERVER(old_dir);
struct nfs_renameargs arg = {
.old_dir = NFS_FH(old_dir),
.new_dir = NFS_FH(new_dir),
.old_name = old_name,
.new_name = new_name,
};
struct nfs_renameres res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status = -ENOMEM;
status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
if (!status) {
update_changeattr(old_dir, &res.old_cinfo);
update_changeattr(new_dir, &res.new_cinfo);
}
return status;
}
static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
struct inode *new_dir, struct qstr *new_name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(old_dir),
_nfs4_proc_rename(old_dir, old_name,
new_dir, new_name),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_link_arg arg = {
.fh = NFS_FH(inode),
.dir_fh = NFS_FH(dir),
.name = name,
.bitmask = server->attr_bitmask,
};
struct nfs4_link_res res = {
.server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status = -ENOMEM;
res.fattr = nfs_alloc_fattr();
if (res.fattr == NULL)
goto out;
status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
if (!status) {
update_changeattr(dir, &res.cinfo);
nfs_post_op_update_inode(inode, res.fattr);
}
out:
nfs_free_fattr(res.fattr);
return status;
}
static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
_nfs4_proc_link(inode, dir, name),
&exception);
} while (exception.retry);
return err;
}
struct nfs4_createdata {
struct rpc_message msg;
struct nfs4_create_arg arg;
struct nfs4_create_res res;
struct nfs_fh fh;
struct nfs_fattr fattr;
};
static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
struct qstr *name, struct iattr *sattr, u32 ftype)
{
struct nfs4_createdata *data;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data != NULL) {
struct nfs_server *server = NFS_SERVER(dir);
data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
data->msg.rpc_argp = &data->arg;
data->msg.rpc_resp = &data->res;
data->arg.dir_fh = NFS_FH(dir);
data->arg.server = server;
data->arg.name = name;
data->arg.attrs = sattr;
data->arg.ftype = ftype;
data->arg.bitmask = server->attr_bitmask;
data->res.server = server;
data->res.fh = &data->fh;
data->res.fattr = &data->fattr;
nfs_fattr_init(data->res.fattr);
}
return data;
}
static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
{
int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
&data->arg.seq_args, &data->res.seq_res, 1);
if (status == 0) {
update_changeattr(dir, &data->res.dir_cinfo);
status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
}
return status;
}
static void nfs4_free_createdata(struct nfs4_createdata *data)
{
kfree(data);
}
static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
struct page *page, unsigned int len, struct iattr *sattr)
{
struct nfs4_createdata *data;
int status = -ENAMETOOLONG;
if (len > NFS4_MAXPATHLEN)
goto out;
status = -ENOMEM;
data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
if (data == NULL)
goto out;
data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
data->arg.u.symlink.pages = &page;
data->arg.u.symlink.len = len;
status = nfs4_do_create(dir, dentry, data);
nfs4_free_createdata(data);
out:
return status;
}
static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
struct page *page, unsigned int len, struct iattr *sattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_symlink(dir, dentry, page,
len, sattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
struct iattr *sattr)
{
struct nfs4_createdata *data;
int status = -ENOMEM;
data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
if (data == NULL)
goto out;
status = nfs4_do_create(dir, dentry, data);
nfs4_free_createdata(data);
out:
return status;
}
static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
struct iattr *sattr)
{
struct nfs4_exception exception = { };
int err;
sattr->ia_mode &= ~current_umask();
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_mkdir(dir, dentry, sattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
u64 cookie, struct page **pages, unsigned int count, int plus)
{
struct inode *dir = dentry->d_inode;
struct nfs4_readdir_arg args = {
.fh = NFS_FH(dir),
.pages = pages,
.pgbase = 0,
.count = count,
.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
.plus = plus,
};
struct nfs4_readdir_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
int status;
dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
dentry->d_parent->d_name.name,
dentry->d_name.name,
(unsigned long long)cookie);
nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
res.pgbase = args.pgbase;
status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
if (status >= 0) {
memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
status += args.pgbase;
}
nfs_invalidate_atime(dir);
dprintk("%s: returns %d\n", __func__, status);
return status;
}
static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
u64 cookie, struct page **pages, unsigned int count, int plus)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
_nfs4_proc_readdir(dentry, cred, cookie,
pages, count, plus),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, dev_t rdev)
{
struct nfs4_createdata *data;
int mode = sattr->ia_mode;
int status = -ENOMEM;
data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
if (data == NULL)
goto out;
if (S_ISFIFO(mode))
data->arg.ftype = NF4FIFO;
else if (S_ISBLK(mode)) {
data->arg.ftype = NF4BLK;
data->arg.u.device.specdata1 = MAJOR(rdev);
data->arg.u.device.specdata2 = MINOR(rdev);
}
else if (S_ISCHR(mode)) {
data->arg.ftype = NF4CHR;
data->arg.u.device.specdata1 = MAJOR(rdev);
data->arg.u.device.specdata2 = MINOR(rdev);
} else if (!S_ISSOCK(mode)) {
status = -EINVAL;
goto out_free;
}
status = nfs4_do_create(dir, dentry, data);
out_free:
nfs4_free_createdata(data);
out:
return status;
}
static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
struct iattr *sattr, dev_t rdev)
{
struct nfs4_exception exception = { };
int err;
sattr->ia_mode &= ~current_umask();
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_mknod(dir, dentry, sattr, rdev),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsstat *fsstat)
{
struct nfs4_statfs_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct nfs4_statfs_res res = {
.fsstat = fsstat,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
.rpc_argp = &args,
.rpc_resp = &res,
};
nfs_fattr_init(fsstat->fattr);
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_statfs(server, fhandle, fsstat),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *fsinfo)
{
struct nfs4_fsinfo_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct nfs4_fsinfo_res res = {
.fsinfo = fsinfo,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
.rpc_argp = &args,
.rpc_resp = &res,
};
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_do_fsinfo(server, fhandle, fsinfo),
&exception);
} while (exception.retry);
return err;
}
static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
int error;
nfs_fattr_init(fsinfo->fattr);
error = nfs4_do_fsinfo(server, fhandle, fsinfo);
if (error == 0) {
/* block layout checks this! */
server->pnfs_blksize = fsinfo->blksize;
set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
}
return error;
}
static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_pathconf *pathconf)
{
struct nfs4_pathconf_arg args = {
.fh = fhandle,
.bitmask = server->attr_bitmask,
};
struct nfs4_pathconf_res res = {
.pathconf = pathconf,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
.rpc_argp = &args,
.rpc_resp = &res,
};
/* None of the pathconf attributes are mandatory to implement */
if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
memset(pathconf, 0, sizeof(*pathconf));
return 0;
}
nfs_fattr_init(pathconf->fattr);
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_pathconf *pathconf)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_pathconf(server, fhandle, pathconf),
&exception);
} while (exception.retry);
return err;
}
void __nfs4_read_done_cb(struct nfs_read_data *data)
{
nfs_invalidate_atime(data->header->inode);
}
static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_server *server = NFS_SERVER(data->header->inode);
if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
__nfs4_read_done_cb(data);
if (task->tk_status > 0)
renew_lease(server, data->timestamp);
return 0;
}
static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
dprintk("--> %s\n", __func__);
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
return data->read_done_cb ? data->read_done_cb(task, data) :
nfs4_read_done_cb(task, data);
}
static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
{
data->timestamp = jiffies;
data->read_done_cb = nfs4_read_done_cb;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
}
static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
{
if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
&data->args.seq_args,
&data->res.seq_res,
task))
return;
rpc_call_start(task);
}
static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
{
struct inode *inode = data->header->inode;
if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
if (task->tk_status >= 0) {
renew_lease(NFS_SERVER(inode), data->timestamp);
nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
}
return 0;
}
static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
return data->write_done_cb ? data->write_done_cb(task, data) :
nfs4_write_done_cb(task, data);
}
static
bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
{
const struct nfs_pgio_header *hdr = data->header;
/* Don't request attributes for pNFS or O_DIRECT writes */
if (data->ds_clp != NULL || hdr->dreq != NULL)
return false;
/* Otherwise, request attributes if and only if we don't hold
* a delegation
*/
return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
}
static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
struct nfs_server *server = NFS_SERVER(data->header->inode);
if (!nfs4_write_need_cache_consistency_data(data)) {
data->args.bitmask = NULL;
data->res.fattr = NULL;
} else
data->args.bitmask = server->cache_consistency_bitmask;
if (!data->write_done_cb)
data->write_done_cb = nfs4_write_done_cb;
data->res.server = server;
data->timestamp = jiffies;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
}
static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
{
if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
&data->args.seq_args,
&data->res.seq_res,
task))
return;
rpc_call_start(task);
}
static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
{
if (nfs4_setup_sequence(NFS_SERVER(data->inode),
&data->args.seq_args,
&data->res.seq_res,
task))
return;
rpc_call_start(task);
}
static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
{
struct inode *inode = data->inode;
if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
return 0;
}
static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
{
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
return data->commit_done_cb(task, data);
}
static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
{
struct nfs_server *server = NFS_SERVER(data->inode);
if (data->commit_done_cb == NULL)
data->commit_done_cb = nfs4_commit_done_cb;
data->res.server = server;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
}
struct nfs4_renewdata {
struct nfs_client *client;
unsigned long timestamp;
};
/*
* nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
* standalone procedure for queueing an asynchronous RENEW.
*/
static void nfs4_renew_release(void *calldata)
{
struct nfs4_renewdata *data = calldata;
struct nfs_client *clp = data->client;
if (atomic_read(&clp->cl_count) > 1)
nfs4_schedule_state_renewal(clp);
nfs_put_client(clp);
kfree(data);
}
static void nfs4_renew_done(struct rpc_task *task, void *calldata)
{
struct nfs4_renewdata *data = calldata;
struct nfs_client *clp = data->client;
unsigned long timestamp = data->timestamp;
if (task->tk_status < 0) {
/* Unless we're shutting down, schedule state recovery! */
if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
return;
if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
nfs4_schedule_lease_recovery(clp);
return;
}
nfs4_schedule_path_down_recovery(clp);
}
do_renew_lease(clp, timestamp);
}
static const struct rpc_call_ops nfs4_renew_ops = {
.rpc_call_done = nfs4_renew_done,
.rpc_release = nfs4_renew_release,
};
static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
.rpc_argp = clp,
.rpc_cred = cred,
};
struct nfs4_renewdata *data;
if (renew_flags == 0)
return 0;
if (!atomic_inc_not_zero(&clp->cl_count))
return -EIO;
data = kmalloc(sizeof(*data), GFP_NOFS);
if (data == NULL)
return -ENOMEM;
data->client = clp;
data->timestamp = jiffies;
return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
&nfs4_renew_ops, data);
}
static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
.rpc_argp = clp,
.rpc_cred = cred,
};
unsigned long now = jiffies;
int status;
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
if (status < 0)
return status;
do_renew_lease(clp, now);
return 0;
}
static inline int nfs4_server_supports_acls(struct nfs_server *server)
{
return (server->caps & NFS_CAP_ACLS)
&& (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
&& (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
}
/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
* it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
* the stack.
*/
#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
static int buf_to_pages_noslab(const void *buf, size_t buflen,
struct page **pages, unsigned int *pgbase)
{
struct page *newpage, **spages;
int rc = 0;
size_t len;
spages = pages;
do {
len = min_t(size_t, PAGE_SIZE, buflen);
newpage = alloc_page(GFP_KERNEL);
if (newpage == NULL)
goto unwind;
memcpy(page_address(newpage), buf, len);
buf += len;
buflen -= len;
*pages++ = newpage;
rc++;
} while (buflen != 0);
return rc;
unwind:
for(; rc > 0; rc--)
__free_page(spages[rc-1]);
return -ENOMEM;
}
struct nfs4_cached_acl {
int cached;
size_t len;
char data[0];
};
static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
{
struct nfs_inode *nfsi = NFS_I(inode);
spin_lock(&inode->i_lock);
kfree(nfsi->nfs4_acl);
nfsi->nfs4_acl = acl;
spin_unlock(&inode->i_lock);
}
static void nfs4_zap_acl_attr(struct inode *inode)
{
nfs4_set_cached_acl(inode, NULL);
}
static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs4_cached_acl *acl;
int ret = -ENOENT;
spin_lock(&inode->i_lock);
acl = nfsi->nfs4_acl;
if (acl == NULL)
goto out;
if (buf == NULL) /* user is just asking for length */
goto out_len;
if (acl->cached == 0)
goto out;
ret = -ERANGE; /* see getxattr(2) man page */
if (acl->len > buflen)
goto out;
memcpy(buf, acl->data, acl->len);
out_len:
ret = acl->len;
out:
spin_unlock(&inode->i_lock);
return ret;
}
static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
{
struct nfs4_cached_acl *acl;
size_t buflen = sizeof(*acl) + acl_len;
if (buflen <= PAGE_SIZE) {
acl = kmalloc(buflen, GFP_KERNEL);
if (acl == NULL)
goto out;
acl->cached = 1;
_copy_from_pages(acl->data, pages, pgbase, acl_len);
} else {
acl = kmalloc(sizeof(*acl), GFP_KERNEL);
if (acl == NULL)
goto out;
acl->cached = 0;
}
acl->len = acl_len;
out:
nfs4_set_cached_acl(inode, acl);
}
/*
* The getxattr API returns the required buffer length when called with a
* NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
* the required buf. On a NULL buf, we send a page of data to the server
* guessing that the ACL request can be serviced by a page. If so, we cache
* up to the page of ACL data, and the 2nd call to getxattr is serviced by
* the cache. If not so, we throw away the page, and cache the required
* length. The next getxattr call will then produce another round trip to
* the server, this time with the input buf of the required size.
*/
static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
struct nfs_getaclargs args = {
.fh = NFS_FH(inode),
.acl_pages = pages,
.acl_len = buflen,
};
struct nfs_getaclres res = {
.acl_len = buflen,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
.rpc_argp = &args,
.rpc_resp = &res,
};
unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
int ret = -ENOMEM, i;
/* As long as we're doing a round trip to the server anyway,
* let's be prepared for a page of acl data. */
if (npages == 0)
npages = 1;
if (npages > ARRAY_SIZE(pages))
return -ERANGE;
for (i = 0; i < npages; i++) {
pages[i] = alloc_page(GFP_KERNEL);
if (!pages[i])
goto out_free;
}
/* for decoding across pages */
res.acl_scratch = alloc_page(GFP_KERNEL);
if (!res.acl_scratch)
goto out_free;
args.acl_len = npages * PAGE_SIZE;
args.acl_pgbase = 0;
dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
__func__, buf, buflen, npages, args.acl_len);
ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
&msg, &args.seq_args, &res.seq_res, 0);
if (ret)
goto out_free;
/* Handle the case where the passed-in buffer is too short */
if (res.acl_flags & NFS4_ACL_TRUNC) {
/* Did the user only issue a request for the acl length? */
if (buf == NULL)
goto out_ok;
ret = -ERANGE;
goto out_free;
}
nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
if (buf)
_copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
out_ok:
ret = res.acl_len;
out_free:
for (i = 0; i < npages; i++)
if (pages[i])
__free_page(pages[i]);
if (res.acl_scratch)
__free_page(res.acl_scratch);
return ret;
}
static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
struct nfs4_exception exception = { };
ssize_t ret;
do {
ret = __nfs4_get_acl_uncached(inode, buf, buflen);
if (ret >= 0)
break;
ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
} while (exception.retry);
return ret;
}
static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
{
struct nfs_server *server = NFS_SERVER(inode);
int ret;
if (!nfs4_server_supports_acls(server))
return -EOPNOTSUPP;
ret = nfs_revalidate_inode(server, inode);
if (ret < 0)
return ret;
if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
nfs_zap_acl_cache(inode);
ret = nfs4_read_cached_acl(inode, buf, buflen);
if (ret != -ENOENT)
/* -ENOENT is returned if there is no ACL or if there is an ACL
* but no cached acl data, just the acl length */
return ret;
return nfs4_get_acl_uncached(inode, buf, buflen);
}
static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
{
struct nfs_server *server = NFS_SERVER(inode);
struct page *pages[NFS4ACL_MAXPAGES];
struct nfs_setaclargs arg = {
.fh = NFS_FH(inode),
.acl_pages = pages,
.acl_len = buflen,
};
struct nfs_setaclres res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
.rpc_argp = &arg,
.rpc_resp = &res,
};
unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
int ret, i;
if (!nfs4_server_supports_acls(server))
return -EOPNOTSUPP;
if (npages > ARRAY_SIZE(pages))
return -ERANGE;
i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
if (i < 0)
return i;
nfs4_inode_return_delegation(inode);
ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
/*
* Free each page after tx, so the only ref left is
* held by the network stack
*/
for (; i > 0; i--)
put_page(pages[i-1]);
/*
* Acl update can result in inode attribute update.
* so mark the attribute cache invalid.
*/
spin_lock(&inode->i_lock);
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
spin_unlock(&inode->i_lock);
nfs_access_zap_cache(inode);
nfs_zap_acl_cache(inode);
return ret;
}
static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(inode),
__nfs4_proc_set_acl(inode, buf, buflen),
&exception);
} while (exception.retry);
return err;
}
static int
nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
{
struct nfs_client *clp = server->nfs_client;
if (task->tk_status >= 0)
return 0;
switch(task->tk_status) {
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
if (state == NULL)
break;
nfs_remove_bad_delegation(state->inode);
case -NFS4ERR_OPENMODE:
if (state == NULL)
break;
nfs4_schedule_stateid_recovery(server, state);
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
if (state != NULL)
nfs4_schedule_stateid_recovery(server, state);
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
nfs4_schedule_lease_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_DEADSESSION:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case -NFS4ERR_SEQ_FALSE_RETRY:
case -NFS4ERR_SEQ_MISORDERED:
dprintk("%s ERROR %d, Reset session\n", __func__,
task->tk_status);
nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
task->tk_status = 0;
return -EAGAIN;
#endif /* CONFIG_NFS_V4_1 */
case -NFS4ERR_DELAY:
nfs_inc_server_stats(server, NFSIOS_DELAY);
case -NFS4ERR_GRACE:
case -EKEYEXPIRED:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
task->tk_status = 0;
return -EAGAIN;
case -NFS4ERR_RETRY_UNCACHED_REP:
case -NFS4ERR_OLD_STATEID:
task->tk_status = 0;
return -EAGAIN;
}
task->tk_status = nfs4_map_errors(task->tk_status);
return 0;
wait_on_recovery:
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);
task->tk_status = 0;
return -EAGAIN;
}
static void nfs4_init_boot_verifier(const struct nfs_client *clp,
nfs4_verifier *bootverf)
{
__be32 verf[2];
if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
/* An impossible timestamp guarantees this value
* will never match a generated boot time. */
verf[0] = 0;
verf[1] = (__be32)(NSEC_PER_SEC + 1);
} else {
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
verf[0] = (__be32)nn->boot_time.tv_sec;
verf[1] = (__be32)nn->boot_time.tv_nsec;
}
memcpy(bootverf->data, verf, sizeof(bootverf->data));
}
static unsigned int
nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
char *buf, size_t len)
{
unsigned int result;
rcu_read_lock();
result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
clp->cl_ipaddr,
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_ADDR),
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_PROTO));
rcu_read_unlock();
return result;
}
static unsigned int
nfs4_init_uniform_client_string(const struct nfs_client *clp,
char *buf, size_t len)
{
char *nodename = clp->cl_rpcclient->cl_nodename;
if (nfs4_client_id_uniquifier[0] != '\0')
nodename = nfs4_client_id_uniquifier;
return scnprintf(buf, len, "Linux NFSv%u.%u %s",
clp->rpc_ops->version, clp->cl_minorversion,
nodename);
}
/**
* nfs4_proc_setclientid - Negotiate client ID
* @clp: state data structure
* @program: RPC program for NFSv4 callback service
* @port: IP port number for NFS4 callback service
* @cred: RPC credential to use for this call
* @res: where to place the result
*
* Returns zero, a negative errno, or a negative NFS4ERR status code.
*/
int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
unsigned short port, struct rpc_cred *cred,
struct nfs4_setclientid_res *res)
{
nfs4_verifier sc_verifier;
struct nfs4_setclientid setclientid = {
.sc_verifier = &sc_verifier,
.sc_prog = program,
.sc_cb_ident = clp->cl_cb_ident,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
.rpc_argp = &setclientid,
.rpc_resp = res,
.rpc_cred = cred,
};
int status;
/* nfs_client_id4 */
nfs4_init_boot_verifier(clp, &sc_verifier);
if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
setclientid.sc_name_len =
nfs4_init_uniform_client_string(clp,
setclientid.sc_name,
sizeof(setclientid.sc_name));
else
setclientid.sc_name_len =
nfs4_init_nonuniform_client_string(clp,
setclientid.sc_name,
sizeof(setclientid.sc_name));
/* cb_client4 */
rcu_read_lock();
setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
sizeof(setclientid.sc_netid),
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_NETID));
rcu_read_unlock();
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
sizeof(setclientid.sc_uaddr), "%s.%u.%u",
clp->cl_ipaddr, port >> 8, port & 255);
dprintk("NFS call setclientid auth=%s, '%.*s'\n",
clp->cl_rpcclient->cl_auth->au_ops->au_name,
setclientid.sc_name_len, setclientid.sc_name);
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
dprintk("NFS reply setclientid: %d\n", status);
return status;
}
/**
* nfs4_proc_setclientid_confirm - Confirm client ID
* @clp: state data structure
* @res: result of a previous SETCLIENTID
* @cred: RPC credential to use for this call
*
* Returns zero, a negative errno, or a negative NFS4ERR status code.
*/
int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
struct nfs4_setclientid_res *arg,
struct rpc_cred *cred)
{
struct nfs_fsinfo fsinfo;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
.rpc_argp = arg,
.rpc_resp = &fsinfo,
.rpc_cred = cred,
};
unsigned long now;
int status;
dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
clp->cl_rpcclient->cl_auth->au_ops->au_name,
clp->cl_clientid);
now = jiffies;
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status == 0) {
spin_lock(&clp->cl_lock);
clp->cl_lease_time = fsinfo.lease_time * HZ;
clp->cl_last_renewal = now;
spin_unlock(&clp->cl_lock);
}
dprintk("NFS reply setclientid_confirm: %d\n", status);
return status;
}
struct nfs4_delegreturndata {
struct nfs4_delegreturnargs args;
struct nfs4_delegreturnres res;
struct nfs_fh fh;
nfs4_stateid stateid;
unsigned long timestamp;
struct nfs_fattr fattr;
int rpc_status;
};
static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
{
struct nfs4_delegreturndata *data = calldata;
if (!nfs4_sequence_done(task, &data->res.seq_res))
return;
switch (task->tk_status) {
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
case 0:
renew_lease(data->res.server, data->timestamp);
break;
default:
if (nfs4_async_handle_error(task, data->res.server, NULL) ==
-EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
}
data->rpc_status = task->tk_status;
}
static void nfs4_delegreturn_release(void *calldata)
{
kfree(calldata);
}
#if defined(CONFIG_NFS_V4_1)
static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
{
struct nfs4_delegreturndata *d_data;
d_data = (struct nfs4_delegreturndata *)data;
if (nfs4_setup_sequence(d_data->res.server,
&d_data->args.seq_args,
&d_data->res.seq_res, task))
return;
rpc_call_start(task);
}
#endif /* CONFIG_NFS_V4_1 */
static const struct rpc_call_ops nfs4_delegreturn_ops = {
#if defined(CONFIG_NFS_V4_1)
.rpc_call_prepare = nfs4_delegreturn_prepare,
#endif /* CONFIG_NFS_V4_1 */
.rpc_call_done = nfs4_delegreturn_done,
.rpc_release = nfs4_delegreturn_release,
};
static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
{
struct nfs4_delegreturndata *data;
struct nfs_server *server = NFS_SERVER(inode);
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
.rpc_cred = cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs4_delegreturn_ops,
.flags = RPC_TASK_ASYNC,
};
int status = 0;
data = kzalloc(sizeof(*data), GFP_NOFS);
if (data == NULL)
return -ENOMEM;
nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
data->args.fhandle = &data->fh;
data->args.stateid = &data->stateid;
data->args.bitmask = server->cache_consistency_bitmask;
nfs_copy_fh(&data->fh, NFS_FH(inode));
nfs4_stateid_copy(&data->stateid, stateid);
data->res.fattr = &data->fattr;
data->res.server = server;
nfs_fattr_init(data->res.fattr);
data->timestamp = jiffies;
data->rpc_status = 0;
task_setup_data.callback_data = data;
msg.rpc_argp = &data->args;
msg.rpc_resp = &data->res;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
if (!issync)
goto out;
status = nfs4_wait_for_completion_rpc_task(task);
if (status != 0)
goto out;
status = data->rpc_status;
if (status == 0)
nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
else
nfs_refresh_inode(inode, &data->fattr);
out:
rpc_put_task(task);
return status;
}
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
switch (err) {
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
case 0:
return 0;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
/*
* sleep, with exponential backoff, and retry the LOCK operation.
*/
static unsigned long
nfs4_set_lock_task_retry(unsigned long timeout)
{
freezable_schedule_timeout_killable(timeout);
timeout <<= 1;
if (timeout > NFS4_LOCK_MAXTIMEOUT)
return NFS4_LOCK_MAXTIMEOUT;
return timeout;
}
static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_client *clp = server->nfs_client;
struct nfs_lockt_args arg = {
.fh = NFS_FH(inode),
.fl = request,
};
struct nfs_lockt_res res = {
.denied = request,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = state->owner->so_cred,
};
struct nfs4_lock_state *lsp;
int status;
arg.lock_owner.clientid = clp->cl_clientid;
status = nfs4_set_lock_state(state, request);
if (status != 0)
goto out;
lsp = request->fl_u.nfs4_fl.owner;
arg.lock_owner.id = lsp->ls_seqid.owner_id;
arg.lock_owner.s_dev = server->s_dev;
status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
switch (status) {
case 0:
request->fl_type = F_UNLCK;
break;
case -NFS4ERR_DENIED:
status = 0;
}
request->fl_ops->fl_release_private(request);
out:
return status;
}
static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(state->inode),
_nfs4_proc_getlk(state, cmd, request),
&exception);
} while (exception.retry);
return err;
}
static int do_vfs_lock(struct file *file, struct file_lock *fl)
{
int res = 0;
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
case FL_POSIX:
res = posix_lock_file_wait(file, fl);
break;
case FL_FLOCK:
res = flock_lock_file_wait(file, fl);
break;
default:
BUG();
}
return res;
}
struct nfs4_unlockdata {
struct nfs_locku_args arg;
struct nfs_locku_res res;
struct nfs4_lock_state *lsp;
struct nfs_open_context *ctx;
struct file_lock fl;
const struct nfs_server *server;
unsigned long timestamp;
};
static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
struct nfs_open_context *ctx,
struct nfs4_lock_state *lsp,
struct nfs_seqid *seqid)
{
struct nfs4_unlockdata *p;
struct inode *inode = lsp->ls_state->inode;
p = kzalloc(sizeof(*p), GFP_NOFS);
if (p == NULL)
return NULL;
p->arg.fh = NFS_FH(inode);
p->arg.fl = &p->fl;
p->arg.seqid = seqid;
p->res.seqid = seqid;
p->arg.stateid = &lsp->ls_stateid;
p->lsp = lsp;
atomic_inc(&lsp->ls_count);
/* Ensure we don't close file until we're done freeing locks! */
p->ctx = get_nfs_open_context(ctx);
memcpy(&p->fl, fl, sizeof(p->fl));
p->server = NFS_SERVER(inode);
return p;
}
static void nfs4_locku_release_calldata(void *data)
{
struct nfs4_unlockdata *calldata = data;
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_lock_state(calldata->lsp);
put_nfs_open_context(calldata->ctx);
kfree(calldata);
}
static void nfs4_locku_done(struct rpc_task *task, void *data)
{
struct nfs4_unlockdata *calldata = data;
if (!nfs4_sequence_done(task, &calldata->res.seq_res))
return;
switch (task->tk_status) {
case 0:
nfs4_stateid_copy(&calldata->lsp->ls_stateid,
&calldata->res.stateid);
renew_lease(calldata->server, calldata->timestamp);
break;
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OLD_STATEID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
break;
default:
if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
rpc_restart_call_prepare(task);
}
nfs_release_seqid(calldata->arg.seqid);
}
static void nfs4_locku_prepare(struct rpc_task *task, void *data)
{
struct nfs4_unlockdata *calldata = data;
if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
return;
if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
/* Note: exit _without_ running nfs4_locku_done */
task->tk_action = NULL;
return;
}
calldata->timestamp = jiffies;
if (nfs4_setup_sequence(calldata->server,
&calldata->arg.seq_args,
&calldata->res.seq_res,
task) != 0)
nfs_release_seqid(calldata->arg.seqid);
else
rpc_call_start(task);
}
static const struct rpc_call_ops nfs4_locku_ops = {
.rpc_call_prepare = nfs4_locku_prepare,
.rpc_call_done = nfs4_locku_done,
.rpc_release = nfs4_locku_release_calldata,
};
static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
struct nfs_open_context *ctx,
struct nfs4_lock_state *lsp,
struct nfs_seqid *seqid)
{
struct nfs4_unlockdata *data;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
.rpc_cred = ctx->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
.rpc_message = &msg,
.callback_ops = &nfs4_locku_ops,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
/* Ensure this is an unlock - when canceling a lock, the
* canceled lock is passed in, and it won't be an unlock.
*/
fl->fl_type = F_UNLCK;
data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
if (data == NULL) {
nfs_free_seqid(seqid);
return ERR_PTR(-ENOMEM);
}
nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
msg.rpc_argp = &data->arg;
msg.rpc_resp = &data->res;
task_setup_data.callback_data = data;
return rpc_run_task(&task_setup_data);
}
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs_inode *nfsi = NFS_I(state->inode);
struct nfs_seqid *seqid;
struct nfs4_lock_state *lsp;
struct rpc_task *task;
int status = 0;
unsigned char fl_flags = request->fl_flags;
status = nfs4_set_lock_state(state, request);
/* Unlock _before_ we do the RPC call */
request->fl_flags |= FL_EXISTS;
down_read(&nfsi->rwsem);
if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
up_read(&nfsi->rwsem);
goto out;
}
up_read(&nfsi->rwsem);
if (status != 0)
goto out;
/* Is this a delegated lock? */
if (test_bit(NFS_DELEGATED_STATE, &state->flags))
goto out;
lsp = request->fl_u.nfs4_fl.owner;
seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
status = -ENOMEM;
if (seqid == NULL)
goto out;
task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
status = PTR_ERR(task);
if (IS_ERR(task))
goto out;
status = nfs4_wait_for_completion_rpc_task(task);
rpc_put_task(task);
out:
request->fl_flags = fl_flags;
return status;
}
struct nfs4_lockdata {
struct nfs_lock_args arg;
struct nfs_lock_res res;
struct nfs4_lock_state *lsp;
struct nfs_open_context *ctx;
struct file_lock fl;
unsigned long timestamp;
int rpc_status;
int cancelled;
struct nfs_server *server;
};
static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
gfp_t gfp_mask)
{
struct nfs4_lockdata *p;
struct inode *inode = lsp->ls_state->inode;
struct nfs_server *server = NFS_SERVER(inode);
p = kzalloc(sizeof(*p), gfp_mask);
if (p == NULL)
return NULL;
p->arg.fh = NFS_FH(inode);
p->arg.fl = &p->fl;
p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
if (p->arg.open_seqid == NULL)
goto out_free;
p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
if (p->arg.lock_seqid == NULL)
goto out_free_seqid;
p->arg.lock_stateid = &lsp->ls_stateid;
p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
p->arg.lock_owner.s_dev = server->s_dev;
p->res.lock_seqid = p->arg.lock_seqid;
p->lsp = lsp;
p->server = server;
atomic_inc(&lsp->ls_count);
p->ctx = get_nfs_open_context(ctx);
memcpy(&p->fl, fl, sizeof(p->fl));
return p;
out_free_seqid:
nfs_free_seqid(p->arg.open_seqid);
out_free:
kfree(p);
return NULL;
}
static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_lockdata *data = calldata;
struct nfs4_state *state = data->lsp->ls_state;
dprintk("%s: begin!\n", __func__);
if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
return;
/* Do we need to do an open_to_lock_owner? */
if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
goto out_release_lock_seqid;
data->arg.open_stateid = &state->stateid;
data->arg.new_lock_owner = 1;
data->res.open_seqid = data->arg.open_seqid;
} else
data->arg.new_lock_owner = 0;
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->server,
&data->arg.seq_args,
&data->res.seq_res,
task) == 0) {
rpc_call_start(task);
return;
}
nfs_release_seqid(data->arg.open_seqid);
out_release_lock_seqid:
nfs_release_seqid(data->arg.lock_seqid);
dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
}
static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
nfs4_lock_prepare(task, calldata);
}
static void nfs4_lock_done(struct rpc_task *task, void *calldata)
{
struct nfs4_lockdata *data = calldata;
dprintk("%s: begin!\n", __func__);
if (!nfs4_sequence_done(task, &data->res.seq_res))
return;
data->rpc_status = task->tk_status;
if (data->arg.new_lock_owner != 0) {
if (data->rpc_status == 0)
nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
else
goto out;
}
if (data->rpc_status == 0) {
nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
}
out:
dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
}
static void nfs4_lock_release(void *calldata)
{
struct nfs4_lockdata *data = calldata;
dprintk("%s: begin!\n", __func__);
nfs_free_seqid(data->arg.open_seqid);
if (data->cancelled != 0) {
struct rpc_task *task;
task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
data->arg.lock_seqid);
if (!IS_ERR(task))
rpc_put_task_async(task);
dprintk("%s: cancelling lock!\n", __func__);
} else
nfs_free_seqid(data->arg.lock_seqid);
nfs4_put_lock_state(data->lsp);
put_nfs_open_context(data->ctx);
kfree(data);
dprintk("%s: done!\n", __func__);
}
static const struct rpc_call_ops nfs4_lock_ops = {
.rpc_call_prepare = nfs4_lock_prepare,
.rpc_call_done = nfs4_lock_done,
.rpc_release = nfs4_lock_release,
};
static const struct rpc_call_ops nfs4_recover_lock_ops = {
.rpc_call_prepare = nfs4_recover_lock_prepare,
.rpc_call_done = nfs4_lock_done,
.rpc_release = nfs4_lock_release,
};
static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
{
switch (error) {
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
if (new_lock_owner != 0 ||
test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
nfs4_schedule_stateid_recovery(server, lsp->ls_state);
break;
case -NFS4ERR_STALE_STATEID:
lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
case -NFS4ERR_EXPIRED:
nfs4_schedule_lease_recovery(server->nfs_client);
};
}
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
{
struct nfs4_lockdata *data;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
.rpc_cred = state->owner->so_cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = NFS_CLIENT(state->inode),
.rpc_message = &msg,
.callback_ops = &nfs4_lock_ops,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
int ret;
dprintk("%s: begin!\n", __func__);
data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
fl->fl_u.nfs4_fl.owner,
recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
if (data == NULL)
return -ENOMEM;
if (IS_SETLKW(cmd))
data->arg.block = 1;
if (recovery_type > NFS_LOCK_NEW) {
if (recovery_type == NFS_LOCK_RECLAIM)
data->arg.reclaim = NFS_LOCK_RECLAIM;
task_setup_data.callback_ops = &nfs4_recover_lock_ops;
}
nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
msg.rpc_argp = &data->arg;
msg.rpc_resp = &data->res;
task_setup_data.callback_data = data;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
ret = nfs4_wait_for_completion_rpc_task(task);
if (ret == 0) {
ret = data->rpc_status;
if (ret)
nfs4_handle_setlk_error(data->server, data->lsp,
data->arg.new_lock_owner, ret);
} else
data->cancelled = 1;
rpc_put_task(task);
dprintk("%s: done, ret = %d!\n", __func__, ret);
return ret;
}
static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = {
.inode = state->inode,
};
int err;
do {
/* Cache the lock if possible... */
if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
return 0;
err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = {
.inode = state->inode,
};
int err;
err = nfs4_set_lock_state(state, request);
if (err != 0)
return err;
do {
if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
return 0;
err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
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;
}
#if defined(CONFIG_NFS_V4_1)
/**
* 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 = -NFS4ERR_BAD_STATEID;
struct nfs4_lock_state *lsp;
struct nfs_server *server = NFS_SERVER(state->inode);
list_for_each_entry(lsp, &state->lock_states, ls_locks) {
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
status = nfs41_test_stateid(server, &lsp->ls_stateid);
if (status != NFS_OK) {
/* Free the stateid unless the server
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server,
&lsp->ls_stateid);
clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
ret = status;
}
}
};
return ret;
}
static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
int status = NFS_OK;
if (test_bit(LK_STATE_IN_USE, &state->flags))
status = nfs41_check_expired_locks(state);
if (status != NFS_OK)
status = nfs4_lock_expired(state, request);
return status;
}
#endif
static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs_inode *nfsi = NFS_I(state->inode);
unsigned char fl_flags = request->fl_flags;
int status = -ENOLCK;
if ((fl_flags & FL_POSIX) &&
!test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
goto out;
/* Is this a delegated open? */
status = nfs4_set_lock_state(state, request);
if (status != 0)
goto out;
request->fl_flags |= FL_ACCESS;
status = do_vfs_lock(request->fl_file, request);
if (status < 0)
goto out;
down_read(&nfsi->rwsem);
if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
/* Yes: cache locks! */
/* ...but avoid races with delegation recall... */
request->fl_flags = fl_flags & ~FL_SLEEP;
status = do_vfs_lock(request->fl_file, request);
goto out_unlock;
}
status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
if (status != 0)
goto out_unlock;
/* Note: we always want to sleep here! */
request->fl_flags = fl_flags | FL_SLEEP;
if (do_vfs_lock(request->fl_file, request) < 0)
printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
"manager!\n", __func__);
out_unlock:
up_read(&nfsi->rwsem);
out:
request->fl_flags = fl_flags;
return status;
}
static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_exception exception = {
.state = state,
.inode = state->inode,
};
int err;
do {
err = _nfs4_proc_setlk(state, cmd, request);
if (err == -NFS4ERR_DENIED)
err = -EAGAIN;
err = nfs4_handle_exception(NFS_SERVER(state->inode),
err, &exception);
} while (exception.retry);
return err;
}
static int
nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
{
struct nfs_open_context *ctx;
struct nfs4_state *state;
unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
int status;
/* verify open state */
ctx = nfs_file_open_context(filp);
state = ctx->state;
if (request->fl_start < 0 || request->fl_end < 0)
return -EINVAL;
if (IS_GETLK(cmd)) {
if (state != NULL)
return nfs4_proc_getlk(state, F_GETLK, request);
return 0;
}
if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
return -EINVAL;
if (request->fl_type == F_UNLCK) {
if (state != NULL)
return nfs4_proc_unlck(state, cmd, request);
return 0;
}
if (state == NULL)
return -ENOLCK;
/*
* Don't rely on the VFS having checked the file open mode,
* since it won't do this for flock() locks.
*/
switch (request->fl_type) {
case F_RDLCK:
if (!(filp->f_mode & FMODE_READ))
return -EBADF;
break;
case F_WRLCK:
if (!(filp->f_mode & FMODE_WRITE))
return -EBADF;
}
do {
status = nfs4_proc_setlk(state, cmd, request);
if ((status != -EAGAIN) || IS_SETLK(cmd))
break;
timeout = nfs4_set_lock_task_retry(timeout);
status = -ERESTARTSYS;
if (signalled())
break;
} while(status < 0);
return status;
}
int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
{
struct nfs_server *server = NFS_SERVER(state->inode);
struct nfs4_exception exception = { };
int err;
err = nfs4_set_lock_state(state, fl);
if (err != 0)
goto out;
do {
err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
switch (err) {
default:
printk(KERN_ERR "NFS: %s: unhandled error "
"%d.\n", __func__, err);
case 0:
case -ESTALE:
goto out;
case -NFS4ERR_EXPIRED:
nfs4_schedule_stateid_recovery(server, state);
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
nfs4_schedule_lease_recovery(server->nfs_client);
goto out;
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);
goto out;
case -ERESTARTSYS:
/*
* The show must go on: exit, but mark the
* stateid as needing recovery.
*/
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OPENMODE:
nfs4_schedule_stateid_recovery(server, state);
err = 0;
goto out;
case -EKEYEXPIRED:
/*
* User RPCSEC_GSS context has expired.
* We cannot recover this stateid now, so
* skip it and allow recovery thread to
* proceed.
*/
err = 0;
goto out;
case -ENOMEM:
case -NFS4ERR_DENIED:
/* kill_proc(fl->fl_pid, SIGLOST, 1); */
err = 0;
goto out;
case -NFS4ERR_DELAY:
break;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
out:
return err;
}
struct nfs_release_lockowner_data {
struct nfs4_lock_state *lsp;
struct nfs_server *server;
struct nfs_release_lockowner_args args;
};
static void nfs4_release_lockowner_release(void *calldata)
{
struct nfs_release_lockowner_data *data = calldata;
nfs4_free_lock_state(data->server, data->lsp);
kfree(calldata);
}
static const struct rpc_call_ops nfs4_release_lockowner_ops = {
.rpc_release = nfs4_release_lockowner_release,
};
int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
{
struct nfs_server *server = lsp->ls_state->owner->so_server;
struct nfs_release_lockowner_data *data;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
};
if (server->nfs_client->cl_mvops->minor_version != 0)
return -EINVAL;
data = kmalloc(sizeof(*data), GFP_NOFS);
if (!data)
return -ENOMEM;
data->lsp = lsp;
data->server = server;
data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
data->args.lock_owner.id = lsp->ls_seqid.owner_id;
data->args.lock_owner.s_dev = server->s_dev;
msg.rpc_argp = &data->args;
rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
return 0;
}
#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
const void *buf, size_t buflen,
int flags, int type)
{
if (strcmp(key, "") != 0)
return -EINVAL;
return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
}
static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
void *buf, size_t buflen, int type)
{
if (strcmp(key, "") != 0)
return -EINVAL;
return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
}
static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
size_t list_len, const char *name,
size_t name_len, int type)
{
size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
return 0;
if (list && len <= list_len)
memcpy(list, XATTR_NAME_NFSV4_ACL, len);
return len;
}
/*
* nfs_fhget will use either the mounted_on_fileid or the fileid
*/
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
{
if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
(fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
(fattr->valid & NFS_ATTR_FATTR_FSID) &&
(fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
return;
fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
fattr->nlink = 2;
}
static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
const struct qstr *name,
struct nfs4_fs_locations *fs_locations,
struct page *page)
{
struct nfs_server *server = NFS_SERVER(dir);
u32 bitmask[2] = {
[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
};
struct nfs4_fs_locations_arg args = {
.dir_fh = NFS_FH(dir),
.name = name,
.page = page,
.bitmask = bitmask,
};
struct nfs4_fs_locations_res res = {
.fs_locations = fs_locations,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
dprintk("%s: start\n", __func__);
/* Ask for the fileid of the absent filesystem if mounted_on_fileid
* is not supported */
if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
else
bitmask[0] |= FATTR4_WORD0_FILEID;
nfs_fattr_init(&fs_locations->fattr);
fs_locations->server = server;
fs_locations->nlocations = 0;
status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
dprintk("%s: returned status = %d\n", __func__, status);
return status;
}
int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
const struct qstr *name,
struct nfs4_fs_locations *fs_locations,
struct page *page)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
{
int status;
struct nfs4_secinfo_arg args = {
.dir_fh = NFS_FH(dir),
.name = name,
};
struct nfs4_secinfo_res res = {
.flavors = flavors,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
.rpc_argp = &args,
.rpc_resp = &res,
};
dprintk("NFS call secinfo %s\n", name->name);
status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
dprintk("NFS reply secinfo: %d\n", status);
return status;
}
int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
struct nfs4_secinfo_flavors *flavors)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_secinfo(dir, name, flavors),
&exception);
} while (exception.retry);
return err;
}
#ifdef CONFIG_NFS_V4_1
/*
* Check the exchange flags returned by the server for invalid flags, having
* both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
* DS flags set.
*/
static int nfs4_check_cl_exchange_flags(u32 flags)
{
if (flags & ~EXCHGID4_FLAG_MASK_R)
goto out_inval;
if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
(flags & EXCHGID4_FLAG_USE_NON_PNFS))
goto out_inval;
if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
goto out_inval;
return NFS_OK;
out_inval:
return -NFS4ERR_INVAL;
}
static bool
nfs41_same_server_scope(struct nfs41_server_scope *a,
struct nfs41_server_scope *b)
{
if (a->server_scope_sz == b->server_scope_sz &&
memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
return true;
return false;
}
/*
* nfs4_proc_bind_conn_to_session()
*
* The 4.1 client currently uses the same TCP connection for the
* fore and backchannel.
*/
int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
{
int status;
struct nfs41_bind_conn_to_session_res res;
struct rpc_message msg = {
.rpc_proc =
&nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
.rpc_argp = clp,
.rpc_resp = &res,
.rpc_cred = cred,
};
dprintk("--> %s\n", __func__);
res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
if (unlikely(res.session == NULL)) {
status = -ENOMEM;
goto out;
}
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status == 0) {
if (memcmp(res.session->sess_id.data,
clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
dprintk("NFS: %s: Session ID mismatch\n", __func__);
status = -EIO;
goto out_session;
}
if (res.dir != NFS4_CDFS4_BOTH) {
dprintk("NFS: %s: Unexpected direction from server\n",
__func__);
status = -EIO;
goto out_session;
}
if (res.use_conn_in_rdma_mode) {
dprintk("NFS: %s: Server returned RDMA mode = true\n",
__func__);
status = -EIO;
goto out_session;
}
}
out_session:
kfree(res.session);
out:
dprintk("<-- %s status= %d\n", __func__, status);
return status;
}
/*
* nfs4_proc_exchange_id()
*
* Returns zero, a negative errno, or a negative NFS4ERR status code.
*
* Since the clientid has expired, all compounds using sessions
* associated with the stale clientid will be returning
* NFS4ERR_BADSESSION in the sequence operation, and will therefore
* be in some phase of session reset.
*/
int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
{
nfs4_verifier verifier;
struct nfs41_exchange_id_args args = {
.verifier = &verifier,
.client = clp,
.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
};
struct nfs41_exchange_id_res res = {
0
};
int status;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
nfs4_init_boot_verifier(clp, &verifier);
args.id_len = nfs4_init_uniform_client_string(clp, args.id,
sizeof(args.id));
dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
clp->cl_rpcclient->cl_auth->au_ops->au_name,
args.id_len, args.id);
res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
GFP_NOFS);
if (unlikely(res.server_owner == NULL)) {
status = -ENOMEM;
goto out;
}
res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
GFP_NOFS);
if (unlikely(res.server_scope == NULL)) {
status = -ENOMEM;
goto out_server_owner;
}
res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
if (unlikely(res.impl_id == NULL)) {
status = -ENOMEM;
goto out_server_scope;
}
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status == 0)
status = nfs4_check_cl_exchange_flags(res.flags);
if (status == 0) {
clp->cl_clientid = res.clientid;
clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
clp->cl_seqid = res.seqid;
kfree(clp->cl_serverowner);
clp->cl_serverowner = res.server_owner;
res.server_owner = NULL;
/* use the most recent implementation id */
kfree(clp->cl_implid);
clp->cl_implid = res.impl_id;
if (clp->cl_serverscope != NULL &&
!nfs41_same_server_scope(clp->cl_serverscope,
res.server_scope)) {
dprintk("%s: server_scope mismatch detected\n",
__func__);
set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
kfree(clp->cl_serverscope);
clp->cl_serverscope = NULL;
}
if (clp->cl_serverscope == NULL) {
clp->cl_serverscope = res.server_scope;
goto out;
}
} else
kfree(res.impl_id);
out_server_owner:
kfree(res.server_owner);
out_server_scope:
kfree(res.server_scope);
out:
if (clp->cl_implid != NULL)
dprintk("NFS reply exchange_id: Server Implementation ID: "
"domain: %s, name: %s, date: %llu,%u\n",
clp->cl_implid->domain, clp->cl_implid->name,
clp->cl_implid->date.seconds,
clp->cl_implid->date.nseconds);
dprintk("NFS reply exchange_id: %d\n", status);
return status;
}
static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
struct rpc_cred *cred)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
.rpc_argp = clp,
.rpc_cred = cred,
};
int status;
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status)
dprintk("NFS: Got error %d from the server %s on "
"DESTROY_CLIENTID.", status, clp->cl_hostname);
return status;
}
static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
struct rpc_cred *cred)
{
unsigned int loop;
int ret;
for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
ret = _nfs4_proc_destroy_clientid(clp, cred);
switch (ret) {
case -NFS4ERR_DELAY:
case -NFS4ERR_CLIENTID_BUSY:
ssleep(1);
break;
default:
return ret;
}
}
return 0;
}
int nfs4_destroy_clientid(struct nfs_client *clp)
{
struct rpc_cred *cred;
int ret = 0;
if (clp->cl_mvops->minor_version < 1)
goto out;
if (clp->cl_exchange_flags == 0)
goto out;
if (clp->cl_preserve_clid)
goto out;
cred = nfs4_get_exchange_id_cred(clp);
ret = nfs4_proc_destroy_clientid(clp, cred);
if (cred)
put_rpccred(cred);
switch (ret) {
case 0:
case -NFS4ERR_STALE_CLIENTID:
clp->cl_exchange_flags = 0;
}
out:
return ret;
}
struct nfs4_get_lease_time_data {
struct nfs4_get_lease_time_args *args;
struct nfs4_get_lease_time_res *res;
struct nfs_client *clp;
};
static void nfs4_get_lease_time_prepare(struct rpc_task *task,
void *calldata)
{
int ret;
struct nfs4_get_lease_time_data *data =
(struct nfs4_get_lease_time_data *)calldata;
dprintk("--> %s\n", __func__);
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
/* just setup sequence, do not trigger session recovery
since we're invoked within one */
ret = nfs41_setup_sequence(data->clp->cl_session,
&data->args->la_seq_args,
&data->res->lr_seq_res, task);
if (ret != -EAGAIN)
rpc_call_start(task);
dprintk("<-- %s\n", __func__);
}
/*
* Called from nfs4_state_manager thread for session setup, so don't recover
* from sequence operation or clientid errors.
*/
static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
{
struct nfs4_get_lease_time_data *data =
(struct nfs4_get_lease_time_data *)calldata;
dprintk("--> %s\n", __func__);
if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
return;
switch (task->tk_status) {
case -NFS4ERR_DELAY:
case -NFS4ERR_GRACE:
dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
rpc_delay(task, NFS4_POLL_RETRY_MIN);
task->tk_status = 0;
/* fall through */
case -NFS4ERR_RETRY_UNCACHED_REP:
rpc_restart_call_prepare(task);
return;
}
dprintk("<-- %s\n", __func__);
}
static const struct rpc_call_ops nfs4_get_lease_time_ops = {
.rpc_call_prepare = nfs4_get_lease_time_prepare,
.rpc_call_done = nfs4_get_lease_time_done,
};
int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
{
struct rpc_task *task;
struct nfs4_get_lease_time_args args;
struct nfs4_get_lease_time_res res = {
.lr_fsinfo = fsinfo,
};
struct nfs4_get_lease_time_data data = {
.args = &args,
.res = &res,
.clp = clp,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
.rpc_argp = &args,
.rpc_resp = &res,
};
struct rpc_task_setup task_setup = {
.rpc_client = clp->cl_rpcclient,
.rpc_message = &msg,
.callback_ops = &nfs4_get_lease_time_ops,
.callback_data = &data,
.flags = RPC_TASK_TIMEOUT,
};
int status;
nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
dprintk("--> %s\n", __func__);
task = rpc_run_task(&task_setup);
if (IS_ERR(task))
status = PTR_ERR(task);
else {
status = task->tk_status;
rpc_put_task(task);
}
dprintk("<-- %s return %d\n", __func__, status);
return status;
}
struct nfs4_slot *nfs4_alloc_slots(struct nfs4_slot_table *table,
u32 max_slots, gfp_t gfp_flags)
{
struct nfs4_slot *tbl;
u32 i;
tbl = kmalloc_array(max_slots, sizeof(*tbl), gfp_flags);
if (tbl != NULL) {
for (i = 0; i < max_slots; i++) {
tbl[i].table = table;
tbl[i].slot_nr = i;
}
}
return tbl;
}
static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
struct nfs4_slot *new,
u32 max_slots,
u32 ivalue)
{
struct nfs4_slot *old = NULL;
u32 i;
spin_lock(&tbl->slot_tbl_lock);
if (new) {
old = tbl->slots;
tbl->slots = new;
tbl->max_slots = max_slots;
}
tbl->highest_used_slotid = NFS4_NO_SLOT;
tbl->target_highest_slotid = max_slots - 1;
for (i = 0; i < tbl->max_slots; i++)
tbl->slots[i].seq_nr = ivalue;
spin_unlock(&tbl->slot_tbl_lock);
kfree(old);
}
/*
* (re)Initialise a slot table
*/
static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
u32 ivalue)
{
struct nfs4_slot *new = NULL;
int ret = -ENOMEM;
dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
max_reqs, tbl->max_slots);
/* Does the newly negotiated max_reqs match the existing slot table? */
if (max_reqs != tbl->max_slots) {
new = nfs4_alloc_slots(tbl, max_reqs, GFP_NOFS);
if (!new)
goto out;
}
ret = 0;
nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
tbl, tbl->slots, tbl->max_slots);
out:
dprintk("<-- %s: return %d\n", __func__, ret);
return ret;
}
/* Destroy the slot table */
static void nfs4_destroy_slot_tables(struct nfs4_session *session)
{
if (session->fc_slot_table.slots != NULL) {
kfree(session->fc_slot_table.slots);
session->fc_slot_table.slots = NULL;
}
if (session->bc_slot_table.slots != NULL) {
kfree(session->bc_slot_table.slots);
session->bc_slot_table.slots = NULL;
}
return;
}
/*
* Initialize or reset the forechannel and backchannel tables
*/
static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
{
struct nfs4_slot_table *tbl;
int status;
dprintk("--> %s\n", __func__);
/* Fore channel */
tbl = &ses->fc_slot_table;
tbl->session = ses;
status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
if (status) /* -ENOMEM */
return status;
/* Back channel */
tbl = &ses->bc_slot_table;
tbl->session = ses;
status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
if (status && tbl->slots == NULL)
/* Fore and back channel share a connection so get
* both slot tables or neither */
nfs4_destroy_slot_tables(ses);
return status;
}
struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
{
struct nfs4_session *session;
struct nfs4_slot_table *tbl;
session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
if (!session)
return NULL;
tbl = &session->fc_slot_table;
tbl->highest_used_slotid = NFS4_NO_SLOT;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
init_completion(&tbl->complete);
tbl = &session->bc_slot_table;
tbl->highest_used_slotid = NFS4_NO_SLOT;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
init_completion(&tbl->complete);
session->session_state = 1<<NFS4_SESSION_INITING;
session->clp = clp;
return session;
}
void nfs4_destroy_session(struct nfs4_session *session)
{
struct rpc_xprt *xprt;
struct rpc_cred *cred;
cred = nfs4_get_exchange_id_cred(session->clp);
nfs4_proc_destroy_session(session, cred);
if (cred)
put_rpccred(cred);
rcu_read_lock();
xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
rcu_read_unlock();
dprintk("%s Destroy backchannel for xprt %p\n",
__func__, xprt);
xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
nfs4_destroy_slot_tables(session);
kfree(session);
}
/*
* Initialize the values to be used by the client in CREATE_SESSION
* If nfs4_init_session set the fore channel request and response sizes,
* use them.
*
* Set the back channel max_resp_sz_cached to zero to force the client to
* always set csa_cachethis to FALSE because the current implementation
* of the back channel DRC only supports caching the CB_SEQUENCE operation.
*/
static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
{
struct nfs4_session *session = args->client->cl_session;
unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
mxresp_sz = session->fc_target_max_resp_sz;
if (mxrqst_sz == 0)
mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
if (mxresp_sz == 0)
mxresp_sz = NFS_MAX_FILE_IO_SIZE;
/* Fore channel attributes */
args->fc_attrs.max_rqst_sz = mxrqst_sz;
args->fc_attrs.max_resp_sz = mxresp_sz;
args->fc_attrs.max_ops = NFS4_MAX_OPS;
args->fc_attrs.max_reqs = max_session_slots;
dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
"max_ops=%u max_reqs=%u\n",
__func__,
args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
/* Back channel attributes */
args->bc_attrs.max_rqst_sz = PAGE_SIZE;
args->bc_attrs.max_resp_sz = PAGE_SIZE;
args->bc_attrs.max_resp_sz_cached = 0;
args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
args->bc_attrs.max_reqs = 1;
dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
__func__,
args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
args->bc_attrs.max_reqs);
}
static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
{
struct nfs4_channel_attrs *sent = &args->fc_attrs;
struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
if (rcvd->max_resp_sz > sent->max_resp_sz)
return -EINVAL;
/*
* Our requested max_ops is the minimum we need; we're not
* prepared to break up compounds into smaller pieces than that.
* So, no point even trying to continue if the server won't
* cooperate:
*/
if (rcvd->max_ops < sent->max_ops)
return -EINVAL;
if (rcvd->max_reqs == 0)
return -EINVAL;
if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
return 0;
}
static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
{
struct nfs4_channel_attrs *sent = &args->bc_attrs;
struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
if (rcvd->max_rqst_sz > sent->max_rqst_sz)
return -EINVAL;
if (rcvd->max_resp_sz < sent->max_resp_sz)
return -EINVAL;
if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
return -EINVAL;
/* These would render the backchannel useless: */
if (rcvd->max_ops != sent->max_ops)
return -EINVAL;
if (rcvd->max_reqs != sent->max_reqs)
return -EINVAL;
return 0;
}
static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
struct nfs4_session *session)
{
int ret;
ret = nfs4_verify_fore_channel_attrs(args, session);
if (ret)
return ret;
return nfs4_verify_back_channel_attrs(args, session);
}
static int _nfs4_proc_create_session(struct nfs_client *clp,
struct rpc_cred *cred)
{
struct nfs4_session *session = clp->cl_session;
struct nfs41_create_session_args args = {
.client = clp,
.cb_program = NFS4_CALLBACK,
};
struct nfs41_create_session_res res = {
.client = clp,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
int status;
nfs4_init_channel_attrs(&args);
args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (!status) {
/* Verify the session's negotiated channel_attrs values */
status = nfs4_verify_channel_attrs(&args, session);
/* Increment the clientid slot sequence id */
clp->cl_seqid++;
}
return status;
}
/*
* Issues a CREATE_SESSION operation to the server.
* It is the responsibility of the caller to verify the session is
* expired before calling this routine.
*/
int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
{
int status;
unsigned *ptr;
struct nfs4_session *session = clp->cl_session;
dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
status = _nfs4_proc_create_session(clp, cred);
if (status)
goto out;
/* Init or reset the session slot tables */
status = nfs4_setup_session_slot_tables(session);
dprintk("slot table setup returned %d\n", status);
if (status)
goto out;
ptr = (unsigned *)&session->sess_id.data[0];
dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
out:
dprintk("<-- %s\n", __func__);
return status;
}
/*
* Issue the over-the-wire RPC DESTROY_SESSION.
* The caller must serialize access to this routine.
*/
int nfs4_proc_destroy_session(struct nfs4_session *session,
struct rpc_cred *cred)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
.rpc_argp = session,
.rpc_cred = cred,
};
int status = 0;
dprintk("--> nfs4_proc_destroy_session\n");
/* session is still being setup */
if (session->clp->cl_cons_state != NFS_CS_READY)
return status;
status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status)
dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
"Session has been destroyed regardless...\n", status);
dprintk("<-- nfs4_proc_destroy_session\n");
return status;
}
/*
* With sessions, the client is not marked ready until after a
* successful EXCHANGE_ID and CREATE_SESSION.
*
* Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
* other versions of NFS can be tried.
*/
static int nfs41_check_session_ready(struct nfs_client *clp)
{
int ret;
if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
ret = nfs4_client_recover_expired_lease(clp);
if (ret)
return ret;
}
if (clp->cl_cons_state < NFS_CS_READY)
return -EPROTONOSUPPORT;
smp_rmb();
return 0;
}
int nfs4_init_session(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_session *session;
unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE;
unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE;
if (!nfs4_has_session(clp))
return 0;
if (server->rsize != 0)
target_max_resp_sz = server->rsize;
target_max_resp_sz += nfs41_maxread_overhead;
if (server->wsize != 0)
target_max_rqst_sz = server->wsize;
target_max_rqst_sz += nfs41_maxwrite_overhead;
session = clp->cl_session;
spin_lock(&clp->cl_lock);
if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
/* Initialise targets and channel attributes */
session->fc_target_max_rqst_sz = target_max_rqst_sz;
session->fc_attrs.max_rqst_sz = target_max_rqst_sz;
session->fc_target_max_resp_sz = target_max_resp_sz;
session->fc_attrs.max_resp_sz = target_max_resp_sz;
} else {
/* Just adjust the targets */
if (target_max_rqst_sz > session->fc_target_max_rqst_sz) {
session->fc_target_max_rqst_sz = target_max_rqst_sz;
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
}
if (target_max_resp_sz > session->fc_target_max_resp_sz) {
session->fc_target_max_resp_sz = target_max_resp_sz;
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
}
}
spin_unlock(&clp->cl_lock);
if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
nfs4_schedule_lease_recovery(clp);
return nfs41_check_session_ready(clp);
}
int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
{
struct nfs4_session *session = clp->cl_session;
int ret;
spin_lock(&clp->cl_lock);
if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
/*
* Do not set NFS_CS_CHECK_LEASE_TIME instead set the
* DS lease to be equal to the MDS lease.
*/
clp->cl_lease_time = lease_time;
clp->cl_last_renewal = jiffies;
}
spin_unlock(&clp->cl_lock);
ret = nfs41_check_session_ready(clp);
if (ret)
return ret;
/* Test for the DS role */
if (!is_ds_client(clp))
return -ENODEV;
return 0;
}
EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
/*
* Renew the cl_session lease.
*/
struct nfs4_sequence_data {
struct nfs_client *clp;
struct nfs4_sequence_args args;
struct nfs4_sequence_res res;
};
static void nfs41_sequence_release(void *data)
{
struct nfs4_sequence_data *calldata = data;
struct nfs_client *clp = calldata->clp;
if (atomic_read(&clp->cl_count) > 1)
nfs4_schedule_state_renewal(clp);
nfs_put_client(clp);
kfree(calldata);
}
static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
switch(task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
return -EAGAIN;
default:
nfs4_schedule_lease_recovery(clp);
}
return 0;
}
static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
{
struct nfs4_sequence_data *calldata = data;
struct nfs_client *clp = calldata->clp;
if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
return;
if (task->tk_status < 0) {
dprintk("%s ERROR %d\n", __func__, task->tk_status);
if (atomic_read(&clp->cl_count) == 1)
goto out;
if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
}
dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
out:
dprintk("<-- %s\n", __func__);
}
static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
{
struct nfs4_sequence_data *calldata = data;
struct nfs_client *clp = calldata->clp;
struct nfs4_sequence_args *args;
struct nfs4_sequence_res *res;
args = task->tk_msg.rpc_argp;
res = task->tk_msg.rpc_resp;
if (nfs41_setup_sequence(clp->cl_session, args, res, task))
return;
rpc_call_start(task);
}
static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
nfs41_sequence_prepare(task, data);
}
static const struct rpc_call_ops nfs41_sequence_ops = {
.rpc_call_done = nfs41_sequence_call_done,
.rpc_call_prepare = nfs41_sequence_prepare,
.rpc_release = nfs41_sequence_release,
};
static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
.rpc_call_done = nfs41_sequence_call_done,
.rpc_call_prepare = nfs41_sequence_prepare_privileged,
.rpc_release = nfs41_sequence_release,
};
static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
const struct rpc_call_ops *seq_ops)
{
struct nfs4_sequence_data *calldata;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
.rpc_cred = cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = clp->cl_rpcclient,
.rpc_message = &msg,
.callback_ops = seq_ops,
.flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
};
if (!atomic_inc_not_zero(&clp->cl_count))
return ERR_PTR(-EIO);
calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
if (calldata == NULL) {
nfs_put_client(clp);
return ERR_PTR(-ENOMEM);
}
nfs41_init_sequence(&calldata->args, &calldata->res, 0);
msg.rpc_argp = &calldata->args;
msg.rpc_resp = &calldata->res;
calldata->clp = clp;
task_setup_data.callback_data = calldata;
return rpc_run_task(&task_setup_data);
}
static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
{
struct rpc_task *task;
int ret = 0;
if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
return 0;
task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
if (IS_ERR(task))
ret = PTR_ERR(task);
else
rpc_put_task_async(task);
dprintk("<-- %s status=%d\n", __func__, ret);
return ret;
}
static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
{
struct rpc_task *task;
int ret;
task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
if (IS_ERR(task)) {
ret = PTR_ERR(task);
goto out;
}
ret = rpc_wait_for_completion_task(task);
if (!ret) {
struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
if (task->tk_status == 0)
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
ret = task->tk_status;
}
rpc_put_task(task);
out:
dprintk("<-- %s status=%d\n", __func__, ret);
return ret;
}
struct nfs4_reclaim_complete_data {
struct nfs_client *clp;
struct nfs41_reclaim_complete_args arg;
struct nfs41_reclaim_complete_res res;
};
static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
{
struct nfs4_reclaim_complete_data *calldata = data;
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
if (nfs41_setup_sequence(calldata->clp->cl_session,
&calldata->arg.seq_args,
&calldata->res.seq_res, task))
return;
rpc_call_start(task);
}
static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
switch(task->tk_status) {
case 0:
case -NFS4ERR_COMPLETE_ALREADY:
case -NFS4ERR_WRONG_CRED: /* What to do here? */
break;
case -NFS4ERR_DELAY:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
/* fall through */
case -NFS4ERR_RETRY_UNCACHED_REP:
return -EAGAIN;
default:
nfs4_schedule_lease_recovery(clp);
}
return 0;
}
static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
{
struct nfs4_reclaim_complete_data *calldata = data;
struct nfs_client *clp = calldata->clp;
struct nfs4_sequence_res *res = &calldata->res.seq_res;
dprintk("--> %s\n", __func__);
if (!nfs41_sequence_done(task, res))
return;
if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
dprintk("<-- %s\n", __func__);
}
static void nfs4_free_reclaim_complete_data(void *data)
{
struct nfs4_reclaim_complete_data *calldata = data;
kfree(calldata);
}
static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
.rpc_call_prepare = nfs4_reclaim_complete_prepare,
.rpc_call_done = nfs4_reclaim_complete_done,
.rpc_release = nfs4_free_reclaim_complete_data,
};
/*
* Issue a global reclaim complete.
*/
static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
{
struct nfs4_reclaim_complete_data *calldata;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
};
struct rpc_task_setup task_setup_data = {
.rpc_client = clp->cl_rpcclient,
.rpc_message = &msg,
.callback_ops = &nfs4_reclaim_complete_call_ops,
.flags = RPC_TASK_ASYNC,
};
int status = -ENOMEM;
dprintk("--> %s\n", __func__);
calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
if (calldata == NULL)
goto out;
calldata->clp = clp;
calldata->arg.one_fs = 0;
nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
msg.rpc_argp = &calldata->arg;
msg.rpc_resp = &calldata->res;
task_setup_data.callback_data = calldata;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task)) {
status = PTR_ERR(task);
goto out;
}
status = nfs4_wait_for_completion_rpc_task(task);
if (status == 0)
status = task->tk_status;
rpc_put_task(task);
return 0;
out:
dprintk("<-- %s status=%d\n", __func__, status);
return status;
}
static void
nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutget *lgp = calldata;
struct nfs_server *server = NFS_SERVER(lgp->args.inode);
dprintk("--> %s\n", __func__);
/* Note the is a race here, where a CB_LAYOUTRECALL can come in
* right now covering the LAYOUTGET we are about to send.
* However, that is not so catastrophic, and there seems
* to be no way to prevent it completely.
*/
if (nfs4_setup_sequence(server, &lgp->args.seq_args,
&lgp->res.seq_res, task))
return;
if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
NFS_I(lgp->args.inode)->layout,
lgp->args.ctx->state)) {
rpc_exit(task, NFS4_OK);
return;
}
rpc_call_start(task);
}
static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutget *lgp = calldata;
struct inode *inode = lgp->args.inode;
struct nfs_server *server = NFS_SERVER(inode);
struct pnfs_layout_hdr *lo;
struct nfs4_state *state = NULL;
dprintk("--> %s\n", __func__);
if (!nfs4_sequence_done(task, &lgp->res.seq_res))
goto out;
switch (task->tk_status) {
case 0:
goto out;
case -NFS4ERR_LAYOUTTRYLATER:
case -NFS4ERR_RECALLCONFLICT:
task->tk_status = -NFS4ERR_DELAY;
break;
case -NFS4ERR_EXPIRED:
case -NFS4ERR_BAD_STATEID:
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (!lo || list_empty(&lo->plh_segs)) {
spin_unlock(&inode->i_lock);
/* If the open stateid was bad, then recover it. */
state = lgp->args.ctx->state;
} else {
LIST_HEAD(head);
pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
spin_unlock(&inode->i_lock);
/* Mark the bad layout state as invalid, then
* retry using the open stateid. */
pnfs_free_lseg_list(&head);
}
}
if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
rpc_restart_call_prepare(task);
out:
dprintk("<-- %s\n", __func__);
}
static size_t max_response_pages(struct nfs_server *server)
{
u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
return nfs_page_array_len(0, max_resp_sz);
}
static void nfs4_free_pages(struct page **pages, size_t size)
{
int i;
if (!pages)
return;
for (i = 0; i < size; i++) {
if (!pages[i])
break;
__free_page(pages[i]);
}
kfree(pages);
}
static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
{
struct page **pages;
int i;
pages = kcalloc(size, sizeof(struct page *), gfp_flags);
if (!pages) {
dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
return NULL;
}
for (i = 0; i < size; i++) {
pages[i] = alloc_page(gfp_flags);
if (!pages[i]) {
dprintk("%s: failed to allocate page\n", __func__);
nfs4_free_pages(pages, size);
return NULL;
}
}
return pages;
}
static void nfs4_layoutget_release(void *calldata)
{
struct nfs4_layoutget *lgp = calldata;
struct nfs_server *server = NFS_SERVER(lgp->args.inode);
size_t max_pages = max_response_pages(server);
dprintk("--> %s\n", __func__);
nfs4_free_pages(lgp->args.layout.pages, max_pages);
put_nfs_open_context(lgp->args.ctx);
kfree(calldata);
dprintk("<-- %s\n", __func__);
}
static const struct rpc_call_ops nfs4_layoutget_call_ops = {
.rpc_call_prepare = nfs4_layoutget_prepare,
.rpc_call_done = nfs4_layoutget_done,
.rpc_release = nfs4_layoutget_release,
};
struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
{
struct nfs_server *server = NFS_SERVER(lgp->args.inode);
size_t max_pages = max_response_pages(server);
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
.rpc_argp = &lgp->args,
.rpc_resp = &lgp->res,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs4_layoutget_call_ops,
.callback_data = lgp,
.flags = RPC_TASK_ASYNC,
};
struct pnfs_layout_segment *lseg = NULL;
int status = 0;
dprintk("--> %s\n", __func__);
lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
if (!lgp->args.layout.pages) {
nfs4_layoutget_release(lgp);
return ERR_PTR(-ENOMEM);
}
lgp->args.layout.pglen = max_pages * PAGE_SIZE;
lgp->res.layoutp = &lgp->args.layout;
lgp->res.seq_res.sr_slot = NULL;
nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return ERR_CAST(task);
status = nfs4_wait_for_completion_rpc_task(task);
if (status == 0)
status = task->tk_status;
if (status == 0)
lseg = pnfs_layout_process(lgp);
rpc_put_task(task);
dprintk("<-- %s status=%d\n", __func__, status);
if (status)
return ERR_PTR(status);
return lseg;
}
static void
nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutreturn *lrp = calldata;
dprintk("--> %s\n", __func__);
if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
&lrp->res.seq_res, task))
return;
rpc_call_start(task);
}
static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutreturn *lrp = calldata;
struct nfs_server *server;
dprintk("--> %s\n", __func__);
if (!nfs4_sequence_done(task, &lrp->res.seq_res))
return;
server = NFS_SERVER(lrp->args.inode);
if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
dprintk("<-- %s\n", __func__);
}
static void nfs4_layoutreturn_release(void *calldata)
{
struct nfs4_layoutreturn *lrp = calldata;
struct pnfs_layout_hdr *lo = lrp->args.layout;
dprintk("--> %s\n", __func__);
spin_lock(&lo->plh_inode->i_lock);
if (lrp->res.lrs_present)
pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
lo->plh_block_lgets--;
spin_unlock(&lo->plh_inode->i_lock);
pnfs_put_layout_hdr(lrp->args.layout);
kfree(calldata);
dprintk("<-- %s\n", __func__);
}
static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
.rpc_call_prepare = nfs4_layoutreturn_prepare,
.rpc_call_done = nfs4_layoutreturn_done,
.rpc_release = nfs4_layoutreturn_release,
};
int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
{
struct rpc_task *task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
.rpc_argp = &lrp->args,
.rpc_resp = &lrp->res,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = lrp->clp->cl_rpcclient,
.rpc_message = &msg,
.callback_ops = &nfs4_layoutreturn_call_ops,
.callback_data = lrp,
};
int status;
dprintk("--> %s\n", __func__);
nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = task->tk_status;
dprintk("<-- %s status=%d\n", __func__, status);
rpc_put_task(task);
return status;
}
/*
* Retrieve the list of Data Server devices from the MDS.
*/
static int _nfs4_getdevicelist(struct nfs_server *server,
const struct nfs_fh *fh,
struct pnfs_devicelist *devlist)
{
struct nfs4_getdevicelist_args args = {
.fh = fh,
.layoutclass = server->pnfs_curr_ld->id,
};
struct nfs4_getdevicelist_res res = {
.devlist = devlist,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
dprintk("--> %s\n", __func__);
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
&res.seq_res, 0);
dprintk("<-- %s status=%d\n", __func__, status);
return status;
}
int nfs4_proc_getdevicelist(struct nfs_server *server,
const struct nfs_fh *fh,
struct pnfs_devicelist *devlist)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_getdevicelist(server, fh, devlist),
&exception);
} while (exception.retry);
dprintk("%s: err=%d, num_devs=%u\n", __func__,
err, devlist->num_devs);
return err;
}
EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
static int
_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
{
struct nfs4_getdeviceinfo_args args = {
.pdev = pdev,
};
struct nfs4_getdeviceinfo_res res = {
.pdev = pdev,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
dprintk("--> %s\n", __func__);
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
dprintk("<-- %s status=%d\n", __func__, status);
return status;
}
int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_proc_getdeviceinfo(server, pdev),
&exception);
} while (exception.retry);
return err;
}
EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutcommit_data *data = calldata;
struct nfs_server *server = NFS_SERVER(data->args.inode);
if (nfs4_setup_sequence(server, &data->args.seq_args,
&data->res.seq_res, task))
return;
rpc_call_start(task);
}
static void
nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
{
struct nfs4_layoutcommit_data *data = calldata;
struct nfs_server *server = NFS_SERVER(data->args.inode);
if (!nfs4_sequence_done(task, &data->res.seq_res))
return;
switch (task->tk_status) { /* Just ignore these failures */
case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
case -NFS4ERR_BADLAYOUT: /* no layout */
case -NFS4ERR_GRACE: /* loca_recalim always false */
task->tk_status = 0;
break;
case 0:
nfs_post_op_update_inode_force_wcc(data->args.inode,
data->res.fattr);
break;
default:
if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
}
}
static void nfs4_layoutcommit_release(void *calldata)
{
struct nfs4_layoutcommit_data *data = calldata;
struct pnfs_layout_segment *lseg, *tmp;
unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
pnfs_cleanup_layoutcommit(data);
/* Matched by references in pnfs_set_layoutcommit */
list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
list_del_init(&lseg->pls_lc_list);
if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
&lseg->pls_flags))
pnfs_put_lseg(lseg);
}
clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
smp_mb__after_clear_bit();
wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
put_rpccred(data->cred);
kfree(data);
}
static const struct rpc_call_ops nfs4_layoutcommit_ops = {
.rpc_call_prepare = nfs4_layoutcommit_prepare,
.rpc_call_done = nfs4_layoutcommit_done,
.rpc_release = nfs4_layoutcommit_release,
};
int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct rpc_task_setup task_setup_data = {
.task = &data->task,
.rpc_client = NFS_CLIENT(data->args.inode),
.rpc_message = &msg,
.callback_ops = &nfs4_layoutcommit_ops,
.callback_data = data,
.flags = RPC_TASK_ASYNC,
};
struct rpc_task *task;
int status = 0;
dprintk("NFS: %4d initiating layoutcommit call. sync %d "
"lbw: %llu inode %lu\n",
data->task.tk_pid, sync,
data->args.lastbytewritten,
data->args.inode->i_ino);
nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
if (sync == false)
goto out;
status = nfs4_wait_for_completion_rpc_task(task);
if (status != 0)
goto out;
status = task->tk_status;
out:
dprintk("%s: status %d\n", __func__, status);
rpc_put_task(task);
return status;
}
static int
_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
{
struct nfs41_secinfo_no_name_args args = {
.style = SECINFO_STYLE_CURRENT_FH,
};
struct nfs4_secinfo_res res = {
.flavors = flavors,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
.rpc_argp = &args,
.rpc_resp = &res,
};
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}
static int
nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
switch (err) {
case 0:
case -NFS4ERR_WRONGSEC:
case -NFS4ERR_NOTSUPP:
goto out;
default:
err = nfs4_handle_exception(server, err, &exception);
}
} while (exception.retry);
out:
return err;
}
static int
nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
int err;
struct page *page;
rpc_authflavor_t flavor;
struct nfs4_secinfo_flavors *flavors;
page = alloc_page(GFP_KERNEL);
if (!page) {
err = -ENOMEM;
goto out;
}
flavors = page_address(page);
err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
/*
* Fall back on "guess and check" method if
* the server doesn't support SECINFO_NO_NAME
*/
if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
err = nfs4_find_root_sec(server, fhandle, info);
goto out_freepage;
}
if (err)
goto out_freepage;
flavor = nfs_find_best_sec(flavors);
if (err == 0)
err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
out_freepage:
put_page(page);
if (err == -EACCES)
return -EPERM;
out:
return err;
}
static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
{
int status;
struct nfs41_test_stateid_args args = {
.stateid = stateid,
};
struct nfs41_test_stateid_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
.rpc_argp = &args,
.rpc_resp = &res,
};
dprintk("NFS call test_stateid %p\n", stateid);
nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
if (status != NFS_OK) {
dprintk("NFS reply test_stateid: failed, %d\n", status);
return status;
}
dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
return -res.status;
}
/**
* nfs41_test_stateid - perform a TEST_STATEID operation
*
* @server: server / transport on which to perform the operation
* @stateid: state ID to test
*
* Returns NFS_OK if the server recognizes that "stateid" is valid.
* Otherwise a negative NFS4ERR value is returned if the operation
* failed or the state ID is not currently valid.
*/
static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs41_test_stateid(server, stateid);
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
{
struct nfs41_free_stateid_args args = {
.stateid = stateid,
};
struct nfs41_free_stateid_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
.rpc_argp = &args,
.rpc_resp = &res,
};
int status;
dprintk("NFS call free_stateid %p\n", stateid);
nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
status = nfs4_call_sync_sequence(server->client, server, &msg,
&args.seq_args, &res.seq_res, 1);
dprintk("NFS reply free_stateid: %d\n", status);
return status;
}
/**
* nfs41_free_stateid - perform a FREE_STATEID operation
*
* @server: server / transport on which to perform the operation
* @stateid: state ID to release
*
* Returns NFS_OK if the server freed "stateid". Otherwise a
* negative NFS4ERR value is returned.
*/
static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_free_stateid(server, stateid);
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static bool nfs41_match_stateid(const nfs4_stateid *s1,
const nfs4_stateid *s2)
{
if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
return false;
if (s1->seqid == s2->seqid)
return true;
if (s1->seqid == 0 || s2->seqid == 0)
return true;
return false;
}
#endif /* CONFIG_NFS_V4_1 */
static bool nfs4_match_stateid(const nfs4_stateid *s1,
const nfs4_stateid *s2)
{
return nfs4_stateid_match(s1, s2);
}
static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
.state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
.recover_open = nfs4_open_reclaim,
.recover_lock = nfs4_lock_reclaim,
.establish_clid = nfs4_init_clientid,
.get_clid_cred = nfs4_get_setclientid_cred,
.detect_trunking = nfs40_discover_server_trunking,
};
#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
.state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
.recover_open = nfs4_open_reclaim,
.recover_lock = nfs4_lock_reclaim,
.establish_clid = nfs41_init_clientid,
.get_clid_cred = nfs4_get_exchange_id_cred,
.reclaim_complete = nfs41_proc_reclaim_complete,
.detect_trunking = nfs41_discover_server_trunking,
};
#endif /* CONFIG_NFS_V4_1 */
static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
.state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
.recover_open = nfs4_open_expired,
.recover_lock = nfs4_lock_expired,
.establish_clid = nfs4_init_clientid,
.get_clid_cred = nfs4_get_setclientid_cred,
};
#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
.state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
.recover_open = nfs41_open_expired,
.recover_lock = nfs41_lock_expired,
.establish_clid = nfs41_init_clientid,
.get_clid_cred = nfs4_get_exchange_id_cred,
};
#endif /* CONFIG_NFS_V4_1 */
static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
.sched_state_renewal = nfs4_proc_async_renew,
.get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
.renew_lease = nfs4_proc_renew,
};
#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
.sched_state_renewal = nfs41_proc_async_sequence,
.get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
.renew_lease = nfs4_proc_sequence,
};
#endif
static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
.minor_version = 0,
.call_sync = _nfs4_call_sync,
.match_stateid = nfs4_match_stateid,
.find_root_sec = nfs4_find_root_sec,
.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
.state_renewal_ops = &nfs40_state_renewal_ops,
};
#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
.minor_version = 1,
.call_sync = _nfs4_call_sync_session,
.match_stateid = nfs41_match_stateid,
.find_root_sec = nfs41_find_root_sec,
.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
.state_renewal_ops = &nfs41_state_renewal_ops,
};
#endif
const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
[0] = &nfs_v4_0_minor_ops,
#if defined(CONFIG_NFS_V4_1)
[1] = &nfs_v4_1_minor_ops,
#endif
};
const struct inode_operations nfs4_dir_inode_operations = {
.create = nfs_create,
.lookup = nfs_lookup,
.atomic_open = nfs_atomic_open,
.link = nfs_link,
.unlink = nfs_unlink,
.symlink = nfs_symlink,
.mkdir = nfs_mkdir,
.rmdir = nfs_rmdir,
.mknod = nfs_mknod,
.rename = nfs_rename,
.permission = nfs_permission,
.getattr = nfs_getattr,
.setattr = nfs_setattr,
.getxattr = generic_getxattr,
.setxattr = generic_setxattr,
.listxattr = generic_listxattr,
.removexattr = generic_removexattr,
};
static const struct inode_operations nfs4_file_inode_operations = {
.permission = nfs_permission,
.getattr = nfs_getattr,
.setattr = nfs_setattr,
.getxattr = generic_getxattr,
.setxattr = generic_setxattr,
.listxattr = generic_listxattr,
.removexattr = generic_removexattr,
};
const struct nfs_rpc_ops nfs_v4_clientops = {
.version = 4, /* protocol version */
.dentry_ops = &nfs4_dentry_operations,
.dir_inode_ops = &nfs4_dir_inode_operations,
.file_inode_ops = &nfs4_file_inode_operations,
.file_ops = &nfs4_file_operations,
.getroot = nfs4_proc_get_root,
.submount = nfs4_submount,
.try_mount = nfs4_try_mount,
.getattr = nfs4_proc_getattr,
.setattr = nfs4_proc_setattr,
.lookup = nfs4_proc_lookup,
.access = nfs4_proc_access,
.readlink = nfs4_proc_readlink,
.create = nfs4_proc_create,
.remove = nfs4_proc_remove,
.unlink_setup = nfs4_proc_unlink_setup,
.unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
.unlink_done = nfs4_proc_unlink_done,
.rename = nfs4_proc_rename,
.rename_setup = nfs4_proc_rename_setup,
.rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
.rename_done = nfs4_proc_rename_done,
.link = nfs4_proc_link,
.symlink = nfs4_proc_symlink,
.mkdir = nfs4_proc_mkdir,
.rmdir = nfs4_proc_remove,
.readdir = nfs4_proc_readdir,
.mknod = nfs4_proc_mknod,
.statfs = nfs4_proc_statfs,
.fsinfo = nfs4_proc_fsinfo,
.pathconf = nfs4_proc_pathconf,
.set_capabilities = nfs4_server_capabilities,
.decode_dirent = nfs4_decode_dirent,
.read_setup = nfs4_proc_read_setup,
.read_pageio_init = pnfs_pageio_init_read,
.read_rpc_prepare = nfs4_proc_read_rpc_prepare,
.read_done = nfs4_read_done,
.write_setup = nfs4_proc_write_setup,
.write_pageio_init = pnfs_pageio_init_write,
.write_rpc_prepare = nfs4_proc_write_rpc_prepare,
.write_done = nfs4_write_done,
.commit_setup = nfs4_proc_commit_setup,
.commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
.commit_done = nfs4_commit_done,
.lock = nfs4_proc_lock,
.clear_acl_cache = nfs4_zap_acl_attr,
.close_context = nfs4_close_context,
.open_context = nfs4_atomic_open,
.have_delegation = nfs4_have_delegation,
.return_delegation = nfs4_inode_return_delegation,
.alloc_client = nfs4_alloc_client,
.init_client = nfs4_init_client,
.free_client = nfs4_free_client,
.create_server = nfs4_create_server,
.clone_server = nfs_clone_server,
};
static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
.prefix = XATTR_NAME_NFSV4_ACL,
.list = nfs4_xattr_list_nfs4_acl,
.get = nfs4_xattr_get_nfs4_acl,
.set = nfs4_xattr_set_nfs4_acl,
};
const struct xattr_handler *nfs4_xattr_handlers[] = {
&nfs4_xattr_nfs4_acl_handler,
NULL
};
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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