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NFSv4: Retry CLOSE and DELEGRETURN on NFS4ERR_OLD_STATEID.

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If we're racing with an OPEN, then retry the operation instead of
declaring it a success.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
[Andrew W Elble: Fix a typo in nfs4_refresh_open_stateid]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2017-11-06 15:28:05 -05:00 committed by Anna Schumaker
parent d803224c84
commit 12f275cdd1
5 changed files with 65 additions and 2 deletions
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27
fs/nfs/delegation.c
View File

@ -1040,6 +1040,33 @@ int nfs_delegations_present(struct nfs_client *clp)
return ret;
}
/**
* nfs4_refresh_delegation_stateid - Update delegation stateid seqid
* @dst: stateid to refresh
* @inode: inode to check
*
* Returns "true" and updates "dst->seqid" * if inode had a delegation
* that matches our delegation stateid. Otherwise "false" is returned.
*/
bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
{
struct nfs_delegation *delegation;
bool ret = false;
if (!inode)
goto out;
rcu_read_lock();
delegation = rcu_dereference(NFS_I(inode)->delegation);
if (delegation != NULL &&
nfs4_stateid_match_other(dst, &delegation->stateid)) {
dst->seqid = delegation->stateid.seqid;
return ret;
}
rcu_read_unlock();
out:
return ret;
}
/**
* nfs4_copy_delegation_stateid - Copy inode's state ID information
* @inode: inode to check

1
fs/nfs/delegation.h
View File

@ -61,6 +61,7 @@ int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4
int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type);
int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred);
bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
int nfs4_have_delegation(struct inode *inode, fmode_t flags);

2
fs/nfs/nfs4_fs.h
View File

@ -460,6 +460,8 @@ extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
const struct nfs_lock_context *, nfs4_stateid *,
struct rpc_cred **);
extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
struct nfs4_state *state);
extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);

21
fs/nfs/nfs4proc.c
View File

@ -3199,13 +3199,21 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
}
break;
case -NFS4ERR_OLD_STATEID:
/* Did we race with OPEN? */
if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
state)) {
task->tk_status = 0;
rpc_restart_call_prepare(task);
}
goto out_release;
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
nfs4_free_revoked_stateid(server,
&calldata->arg.stateid,
task->tk_msg.rpc_cred);
case -NFS4ERR_OLD_STATEID:
/* Fallthrough */
case -NFS4ERR_BAD_STATEID:
if (!nfs4_stateid_match(&calldata->arg.stateid,
&state->open_stateid)) {
@ -3214,6 +3222,7 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
}
if (calldata->arg.fmode == 0)
break;
/* Fallthrough */
default:
if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
@ -5793,11 +5802,19 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
nfs4_free_revoked_stateid(data->res.server,
data->args.stateid,
task->tk_msg.rpc_cred);
/* Fallthrough */
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OLD_STATEID:
case -NFS4ERR_STALE_STATEID:
task->tk_status = 0;
break;
case -NFS4ERR_OLD_STATEID:
if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) {
task->tk_status = 0;
rpc_restart_call_prepare(task);
return;
}
task->tk_status = 0;
break;
case -NFS4ERR_ACCESS:
if (data->args.bitmask) {
data->args.bitmask = NULL;

16
fs/nfs/nfs4state.c
View File

@ -986,6 +986,22 @@ static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
return ret;
}
bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
bool ret;
int seq;
do {
ret = false;
seq = read_seqbegin(&state->seqlock);
if (nfs4_state_match_open_stateid_other(state, dst)) {
dst->seqid = state->open_stateid.seqid;
ret = true;
}
} while (read_seqretry(&state->seqlock, seq));
return ret;
}
static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
const nfs4_stateid *src;