blob: f7b7698cd9a7c30eb9525103ba178c25b0527eb2 [file] [log] [blame]
/*
* 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/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/namei.h>
#include <linux/mount.h>
#include <linux/module.h>
#include <linux/sunrpc/bc_xprt.h>
#include "nfs4_fs.h"
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "callback.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 int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *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);
/* 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;
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[2] = {
FATTR4_WORD0_TYPE
| FATTR4_WORD0_CHANGE
| FATTR4_WORD0_SIZE
| FATTR4_WORD0_FSID
| FATTR4_WORD0_FILEID,
FATTR4_WORD1_MODE
| FATTR4_WORD1_NUMLINKS
| FATTR4_WORD1_OWNER
| FATTR4_WORD1_OWNER_GROUP
| FATTR4_WORD1_RAWDEV
| FATTR4_WORD1_SPACE_USED
| FATTR4_WORD1_TIME_ACCESS
| FATTR4_WORD1_TIME_METADATA
| FATTR4_WORD1_TIME_MODIFY
};
const u32 nfs4_statfs_bitmap[2] = {
FATTR4_WORD0_FILES_AVAIL
| FATTR4_WORD0_FILES_FREE
| FATTR4_WORD0_FILES_TOTAL,
FATTR4_WORD1_SPACE_AVAIL
| FATTR4_WORD1_SPACE_FREE
| FATTR4_WORD1_SPACE_TOTAL
};
const u32 nfs4_pathconf_bitmap[2] = {
FATTR4_WORD0_MAXLINK
| FATTR4_WORD0_MAXNAME,
0
};
const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
| FATTR4_WORD0_MAXREAD
| FATTR4_WORD0_MAXWRITE
| FATTR4_WORD0_LEASE_TIME,
0
};
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;
BUG_ON(readdir->count < 80);
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, KM_USER0);
if (cookie == 0) {
*p++ = xdr_one; /* next */
*p++ = xdr_zero; /* cookie, first word */
*p++ = xdr_one; /* cookie, second word */
*p++ = xdr_one; /* entry len */
memcpy(p, ".\0\0\0", 4); /* entry */
p++;
*p++ = xdr_one; /* bitmap length */
*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
*p++ = htonl(8); /* attribute buffer length */
p = xdr_encode_hyper(p, 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, KM_USER0);
}
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);
return res;
}
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;
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(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_state *state = exception->state;
int ret = errorcode;
exception->retry = 0;
switch(errorcode) {
case 0:
return 0;
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OPENMODE:
if (state == NULL)
break;
nfs4_state_mark_reclaim_nograce(clp, state);
goto do_state_recovery;
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_EXPIRED:
goto do_state_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_state_recovery(clp);
exception->retry = 1;
break;
#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_OLD_STATEID:
exception->retry = 1;
}
/* We failed to handle the error */
return nfs4_map_errors(ret);
do_state_recovery:
nfs4_schedule_state_recovery(clp);
ret = nfs4_wait_clnt_recover(clp);
if (ret == 0)
exception->retry = 1;
return ret;
}
static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
{
struct nfs_client *clp = server->nfs_client;
spin_lock(&clp->cl_lock);
if (time_before(clp->cl_last_renewal,timestamp))
clp->cl_last_renewal = timestamp;
spin_unlock(&clp->cl_lock);
}
#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 -1.
*
* Must be called while holding tbl->slot_tbl_lock
*/
static void
nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
{
int slotid = free_slotid;
/* 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) {
slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
if (slotid < tbl->max_slots)
tbl->highest_used_slotid = slotid;
else
tbl->highest_used_slotid = -1;
}
dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
free_slotid, tbl->highest_used_slotid);
}
/*
* Signal state manager thread if session is drained
*/
static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
{
struct rpc_task *task;
if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
if (task)
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
return;
}
if (ses->fc_slot_table.highest_used_slotid != -1)
return;
dprintk("%s COMPLETE: Session Drained\n", __func__);
complete(&ses->complete);
}
static void nfs41_sequence_free_slot(const struct nfs_client *clp,
struct nfs4_sequence_res *res)
{
struct nfs4_slot_table *tbl;
tbl = &clp->cl_session->fc_slot_table;
if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
/* just wake up the next guy waiting since
* we may have not consumed a slot after all */
dprintk("%s: No slot\n", __func__);
return;
}
spin_lock(&tbl->slot_tbl_lock);
nfs4_free_slot(tbl, res->sr_slotid);
nfs41_check_drain_session_complete(clp->cl_session);
spin_unlock(&tbl->slot_tbl_lock);
res->sr_slotid = NFS4_MAX_SLOT_TABLE;
}
static void nfs41_sequence_done(struct nfs_client *clp,
struct nfs4_sequence_res *res,
int rpc_status)
{
unsigned long timestamp;
struct nfs4_slot_table *tbl;
struct nfs4_slot *slot;
/*
* 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;
/* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
goto out;
/* Check the SEQUENCE operation status */
if (res->sr_status == 0) {
tbl = &clp->cl_session->fc_slot_table;
slot = tbl->slots + res->sr_slotid;
/* Update the slot's sequence and clientid lease timer */
++slot->seq_nr;
timestamp = res->sr_renewal_time;
spin_lock(&clp->cl_lock);
if (time_before(clp->cl_last_renewal, timestamp))
clp->cl_last_renewal = timestamp;
spin_unlock(&clp->cl_lock);
/* Check sequence flags */
if (atomic_read(&clp->cl_count) > 1)
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
}
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(clp, res);
}
/*
* nfs4_find_slot - efficiently look for a free slot
*
* nfs4_find_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.
* The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
*
* Note: must be called with under the slot_tbl_lock.
*/
static u8
nfs4_find_slot(struct nfs4_slot_table *tbl)
{
int slotid;
u8 ret_id = NFS4_MAX_SLOT_TABLE;
BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\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 = slotid;
ret_id = slotid;
out:
dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
return ret_id;
}
static int nfs41_setup_sequence(struct nfs4_session *session,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply,
struct rpc_task *task)
{
struct nfs4_slot *slot;
struct nfs4_slot_table *tbl;
u8 slotid;
dprintk("--> %s\n", __func__);
/* slot already allocated? */
if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
return 0;
memset(res, 0, sizeof(*res));
res->sr_slotid = NFS4_MAX_SLOT_TABLE;
tbl = &session->fc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state) &&
!rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
/*
* The state manager will wait until the slot table is empty.
* Schedule the reset thread
*/
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
dprintk("%s Schedule Session Reset\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;
}
slotid = nfs4_find_slot(tbl);
if (slotid == NFS4_MAX_SLOT_TABLE) {
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);
slot = tbl->slots + slotid;
args->sa_session = session;
args->sa_slotid = slotid;
args->sa_cache_this = cache_reply;
dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
res->sr_session = session;
res->sr_slotid = slotid;
res->sr_renewal_time = jiffies;
/*
* 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;
}
int nfs4_setup_sequence(struct nfs_client *clp,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply,
struct rpc_task *task)
{
int ret = 0;
dprintk("--> %s clp %p session %p sr_slotid %d\n",
__func__, clp, clp->cl_session, res->sr_slotid);
if (!nfs4_has_session(clp))
goto out;
ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
task);
if (ret && ret != -EAGAIN) {
/* terminate rpc task */
task->tk_status = ret;
task->tk_action = NULL;
}
out:
dprintk("<-- %s status=%d\n", __func__, ret);
return ret;
}
struct nfs41_call_sync_data {
struct nfs_client *clp;
struct nfs4_sequence_args *seq_args;
struct nfs4_sequence_res *seq_res;
int cache_reply;
};
static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
{
struct nfs41_call_sync_data *data = calldata;
dprintk("--> %s data->clp->cl_session %p\n", __func__,
data->clp->cl_session);
if (nfs4_setup_sequence(data->clp, data->seq_args,
data->seq_res, data->cache_reply, 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(data->clp, data->seq_res, task->tk_status);
}
struct rpc_call_ops nfs41_call_sync_ops = {
.rpc_call_prepare = nfs41_call_sync_prepare,
.rpc_call_done = nfs41_call_sync_done,
};
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 nfs_client *clp,
struct rpc_clnt *clnt,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply,
int privileged)
{
int ret;
struct rpc_task *task;
struct nfs41_call_sync_data data = {
.clp = clp,
.seq_args = args,
.seq_res = res,
.cache_reply = cache_reply,
};
struct rpc_task_setup task_setup = {
.rpc_client = clnt,
.rpc_message = msg,
.callback_ops = &nfs41_call_sync_ops,
.callback_data = &data
};
res->sr_slotid = NFS4_MAX_SLOT_TABLE;
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 nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply)
{
return nfs4_call_sync_sequence(server->nfs_client, server->client,
msg, args, res, cache_reply, 0);
}
#endif /* CONFIG_NFS_V4_1 */
int _nfs4_call_sync(struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply)
{
args->sa_session = res->sr_session = NULL;
return rpc_call_sync(server->client, msg, 0);
}
#define nfs4_call_sync(server, msg, args, res, cache_reply) \
(server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
&(res)->seq_res, (cache_reply))
static void nfs4_sequence_done(const struct nfs_server *server,
struct nfs4_sequence_res *res, int rpc_status)
{
#ifdef CONFIG_NFS_V4_1
if (nfs4_has_session(server->nfs_client))
nfs41_sequence_done(server->nfs_client, res, rpc_status);
#endif /* CONFIG_NFS_V4_1 */
}
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_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
nfs_force_lookup_revalidate(dir);
nfsi->change_attr = 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 nfs_fattr f_attr;
struct nfs_fattr dir_attr;
struct path path;
struct dentry *dir;
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.dir_attr = &p->dir_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;
nfs_fattr_init(&p->f_attr);
nfs_fattr_init(&p->dir_attr);
p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
}
static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
struct nfs4_state_owner *sp, fmode_t fmode, int flags,
const struct iattr *attrs,
gfp_t gfp_mask)
{
struct dentry *parent = dget_parent(path->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;
path_get(path);
p->path = *path;
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);
p->o_arg.clientid = server->nfs_client->cl_clientid;
p->o_arg.id = sp->so_owner_id.id;
p->o_arg.name = &p->path.dentry->d_name;
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
if (flags & O_EXCL) {
if (nfs4_has_persistent_session(server->nfs_client)) {
/* GUARDED */
p->o_arg.u.attrs = &p->attrs;
memcpy(&p->attrs, attrs, sizeof(p->attrs));
} else { /* EXCLUSIVE4_1 */
u32 *s = (u32 *) p->o_arg.u.verifier.data;
s[0] = jiffies;
s[1] = current->pid;
}
} else if (flags & O_CREAT) {
p->o_arg.u.attrs = &p->attrs;
memcpy(&p->attrs, attrs, sizeof(p->attrs));
}
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);
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);
path_put(&p->path);
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)
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->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)
memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
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) {
memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
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 (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
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();
nfs_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;
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 (delegation == NULL ||
!can_open_delegated(delegation, fmode)) {
rcu_read_unlock();
break;
}
/* Save the delegation */
memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
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 struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
struct inode *inode;
struct nfs4_state *state = NULL;
struct nfs_delegation *delegation;
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) {
int delegation_flags = 0;
rcu_read_lock();
delegation = rcu_dereference(NFS_I(inode)->delegation);
if (delegation)
delegation_flags = delegation->flags;
rcu_read_unlock();
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);
}
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 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->path, 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(&opendata->path, 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 &&
memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
write_seqlock(&state->seqlock);
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
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 && err != -EKEYEXPIRED)
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;
memcpy(opendata->o_arg.u.delegation.data, stateid->data,
sizeof(opendata->o_arg.u.delegation.data));
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_state_recovery(
server->nfs_client);
goto out;
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
/* Don't recall a delegation if it was lost */
nfs4_schedule_state_recovery(server->nfs_client);
goto out;
case -ERESTARTSYS:
/*
* The show must go on: exit, but mark the
* stateid as needing recovery.
*/
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
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 (RPC_ASSASSINATED(task))
return;
if (data->rpc_status == 0) {
memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
sizeof(data->o_res.stateid.data));
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(&data->path, 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 (delegation != NULL &&
test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
rcu_read_unlock();
goto out_no_action;
}
rcu_read_unlock();
}
/* Update sequence id. */
data->o_arg.id = sp->so_owner_id.id;
data->o_arg.clientid = sp->so_client->cl_clientid;
if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
}
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
&data->o_arg.seq_args,
&data->o_res.seq_res, 1, task))
return;
rpc_call_start(task);
return;
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;
nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
task->tk_status);
if (RPC_ASSASSINATED(task))
return;
if (task->tk_status == 0) {
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(&data->path, 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;
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_refresh_inode(dir, o_res->dir_attr);
if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
status = _nfs4_proc_open_confirm(data);
if (status != 0)
return status;
}
return status;
}
/*
* 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 (status != 0 || !data->rpc_done)
return status;
if (o_arg->open_flags & O_CREAT) {
update_changeattr(dir, &o_res->cinfo);
nfs_post_op_update_inode(dir, o_res->dir_attr);
} else
nfs_refresh_inode(dir, o_res->dir_attr);
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_recover_expired_lease(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
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_recovery(clp);
ret = -EIO;
}
return ret;
}
/*
* 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->path.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:
case -EKEYEXPIRED:
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;
}
/*
* 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 path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
{
struct nfs4_state_owner *sp;
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *opendata;
int status;
/* Protect against reboot recovery conflicts */
status = -ENOMEM;
if (!(sp = nfs4_get_state_owner(server, cred))) {
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 (path->dentry->d_inode != NULL)
nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
status = -ENOMEM;
opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
if (opendata == NULL)
goto err_put_state_owner;
if (path->dentry->d_inode != NULL)
opendata->state = nfs4_get_open_state(path->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);
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);
}
nfs4_opendata_put(opendata);
nfs4_put_state_owner(sp);
*res = state;
return 0;
err_opendata_put:
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 path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
{
struct nfs4_exception exception = { };
struct nfs4_state *res;
int status;
do {
status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
if (status == 0)
break;
/* NOTE: BAD_SEQID means the server and client disagree about the
* book-keeping w.r.t. state-changing operations
* (OPEN/CLOSE/LOCK/LOCKU...)
* It is actually a sign of a bug on the client or on the server.
*
* If we receive a BAD_SEQID error in the particular case of
* doing an OPEN, we assume that 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) {
printk(KERN_WARNING "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 (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
/* Use that stateid */
} else if (state != NULL) {
nfs4_copy_stateid(&arg.stateid, state, current->files);
} else
memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
status = nfs4_call_sync(server, &msg, &arg, &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 = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_do_setattr(inode, cred, fattr, sattr, state),
&exception);
} while (exception.retry);
return err;
}
struct nfs4_closedata {
struct path path;
struct inode *inode;
struct nfs4_state *state;
struct nfs_closeargs arg;
struct nfs_closeres res;
struct nfs_fattr fattr;
unsigned long timestamp;
};
static void nfs4_free_closedata(void *data)
{
struct nfs4_closedata *calldata = data;
struct nfs4_state_owner *sp = calldata->state->owner;
nfs4_put_open_state(calldata->state);
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_state_owner(sp);
path_put(&calldata->path);
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);
nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
if (RPC_ASSASSINATED(task))
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:
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);
}
static void nfs4_close_prepare(struct rpc_task *task, void *data)
{
struct nfs4_closedata *calldata = data;
struct nfs4_state *state = calldata->state;
int call_close = 0;
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;
return;
}
if (calldata->arg.fmode == 0)
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
nfs_fattr_init(calldata->res.fattr);
calldata->timestamp = jiffies;
if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
&calldata->arg.seq_args, &calldata->res.seq_res,
1, task))
return;
rpc_call_start(task);
}
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 path *path, 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;
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->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
path_get(path);
calldata->path = *path;
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 int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
{
struct file *filp;
int ret;
/* If the open_intent is for execute, we have an extra check to make */
if (fmode & FMODE_EXEC) {
ret = nfs_may_open(state->inode,
state->owner->so_cred,
nd->intent.open.flags);
if (ret < 0)
goto out_close;
}
filp = lookup_instantiate_filp(nd, path->dentry, NULL);
if (!IS_ERR(filp)) {
struct nfs_open_context *ctx;
ctx = nfs_file_open_context(filp);
ctx->state = state;
return 0;
}
ret = PTR_ERR(filp);
out_close:
nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
return ret;
}
struct dentry *
nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct path path = {
.mnt = nd->path.mnt,
.dentry = dentry,
};
struct dentry *parent;
struct iattr attr;
struct rpc_cred *cred;
struct nfs4_state *state;
struct dentry *res;
int open_flags = nd->intent.open.flags;
fmode_t fmode = open_flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
if (nd->flags & LOOKUP_CREATE) {
attr.ia_mode = nd->intent.open.create_mode;
attr.ia_valid = ATTR_MODE;
if (!IS_POSIXACL(dir))
attr.ia_mode &= ~current_umask();
} else {
open_flags &= ~O_EXCL;
attr.ia_valid = 0;
BUG_ON(open_flags & O_CREAT);
}
cred = rpc_lookup_cred();
if (IS_ERR(cred))
return (struct dentry *)cred;
parent = dentry->d_parent;
/* Protect against concurrent sillydeletes */
nfs_block_sillyrename(parent);
state = nfs4_do_open(dir, &path, fmode, open_flags, &attr, cred);
put_rpccred(cred);
if (IS_ERR(state)) {
if (PTR_ERR(state) == -ENOENT) {
d_add(dentry, NULL);
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
}
nfs_unblock_sillyrename(parent);
return (struct dentry *)state;
}
res = d_add_unique(dentry, igrab(state->inode));
if (res != NULL)
path.dentry = res;
nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
nfs_unblock_sillyrename(parent);
nfs4_intent_set_file(nd, &path, state, fmode);
return res;
}
int
nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
{
struct path path = {
.mnt = nd->path.mnt,
.dentry = dentry,
};
struct rpc_cred *cred;
struct nfs4_state *state;
fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
cred = rpc_lookup_cred();
if (IS_ERR(cred))
return PTR_ERR(cred);
state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
put_rpccred(cred);
if (IS_ERR(state)) {
switch (PTR_ERR(state)) {
case -EPERM:
case -EACCES:
case -EDQUOT:
case -ENOSPC:
case -EROFS:
return PTR_ERR(state);
default:
goto out_drop;
}
}
if (state->inode == dentry->d_inode) {
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
nfs4_intent_set_file(nd, &path, state, fmode);
return 1;
}
nfs4_close_sync(&path, state, fmode);
out_drop:
d_drop(dentry);
return 0;
}
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->path, ctx->state, ctx->mode);
else
nfs4_close_state(&ctx->path, 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, &msg, &args, &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;
}
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, &msg, &args, &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_handle_exception(server,
_nfs4_lookup_root(server, fhandle, info),
&exception);
} while (exception.retry);
return err;
}
/*
* get the file handle for the "/" directory on the server
*/
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
int status;
status = nfs4_lookup_root(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);
}
/*
* 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 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(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;
}
memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
if (!fattr->mode)
fattr->mode = S_IFDIR;
memset(fhandle, 0, sizeof(struct nfs_fh));
out:
if (page)
__free_page(page);
if (locations)
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, &msg, &args, &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;
nfs_fattr_init(fattr);
/* 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_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
const struct qstr *name, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
int status;
struct nfs4_lookup_arg args = {
.bitmask = server->attr_bitmask,
.dir_fh = dirfh,
.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 lookupfh %s\n", name->name);
status = nfs4_call_sync(server, &msg, &args, &res, 0);
dprintk("NFS reply lookupfh: %d\n", status);
return status;
}
static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
struct qstr *name, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
/* FIXME: !!!! */
if (err == -NFS4ERR_MOVED) {
err = -EREMOTE;
break;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
int status;
dprintk("NFS call lookup %s\n", name->name);
status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
if (status == -NFS4ERR_MOVED)
status = nfs4_get_referral(dir, name, fattr, fhandle);
dprintk("NFS reply lookup: %d\n", status);
return status;
}
static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
_nfs4_proc_lookup(dir, name, fhandle, fattr),
&exception);
} while (exception.retry);
return err;
}
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_accessargs args = {
.fh = NFS_FH(inode),
.bitmask = server->attr_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, &msg, &args, &res, 0);
if (!status) {
entry->mask = 0;
if (res.access & NFS4_ACCESS_READ)
entry->mask |= MAY_READ;
if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
entry->mask |= MAY_WRITE;
if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
entry->mask |= MAY_EXEC;
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. This means that
* we can't use xdr_encode_pages() as written: we need a variant
* of it which would leave room in the 'tail' iovec.
*
* Both of these changes to the XDR layer would in fact be quite
* minor, but I decided to leave them for a subsequent patch.
*/
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
unsigned int pgbase, unsigned int pglen)
{
struct nfs4_readlink args = {
.fh = NFS_FH(inode),
.pgbase = pgbase,
.pglen = pglen,
.pages = &page,
};
struct 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), &msg, &args, &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;
}
/*
* Got race?
* We will need to arrange for the VFS layer to provide an atomic open.
* Until then, this create/open method is prone to inefficiency and race
* conditions due to the lookup, create, and open VFS calls from sys_open()
* placed on the wire.
*
* Given the above sorry state of affairs, I'm simply sending an OPEN.
* The file will be opened again in the subsequent VFS open call
* (nfs4_proc_file_open).
*
* The open for read will just hang around to be used by any process that
* opens the file O_RDONLY. This will all be resolved with the VFS changes.
*/
static int
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nameidata *nd)
{
struct path path = {
.mnt = nd->path.mnt,
.dentry = dentry,
};
struct nfs4_state *state;
struct rpc_cred *cred;
fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
int status = 0;
cred = rpc_lookup_cred();
if (IS_ERR(cred)) {
status = PTR_ERR(cred);
goto out;
}
state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
d_drop(dentry);
if (IS_ERR(state)) {
status = PTR_ERR(state);
goto out_putcred;
}
d_add(dentry, igrab(state->inode));
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
status = nfs4_intent_set_file(nd, &path, state, fmode);
else
nfs4_close_sync(&path, state, fmode);
out_putcred:
put_rpccred(cred);
out:
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.len = name->len,
.name.name = name->name,
.bitmask = server->attr_bitmask,
};
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 = -ENOMEM;
res.dir_attr = nfs_alloc_fattr();
if (res.dir_attr == NULL)
goto out;
status = nfs4_call_sync(server, &msg, &args, &res, 1);
if (status == 0) {
update_changeattr(dir, &res.cinfo);
nfs_post_op_update_inode(dir, res.dir_attr);
}
nfs_free_fattr(res.dir_attr);
out:
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);