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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-12-15 14:47:36 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-12-15 14:47:36 -0500 |
| commit | 72211dbe727f7c1451aa5adfcbd1197b090eb276 (patch) | |
| tree | 1669a3a5e7d30e71451cd975161506b84bf6b1ad | |
| parent | 68bf05efb7facbcf4a7b8d6b48a0800a90895511 (diff) | |
| download | linux-72211dbe727f7c1451aa5adfcbd1197b090eb276.tar.gz linux-72211dbe727f7c1451aa5adfcbd1197b090eb276.tar.bz2 linux-72211dbe727f7c1451aa5adfcbd1197b090eb276.zip | |
NFSv4: Release the sequence id before restarting a CLOSE rpc call
If the CLOSE or OPEN_DOWNGRADE call triggers a state recovery, and has
to be resent, then we must release the seqid. Otherwise the open
recovery will wait for the close to finish, which causes a deadlock.
This is mainly a NFSv4.1 problem, although it can theoretically happen
with NFSv4.0 too, in a OPEN_DOWNGRADE situation.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| -rw-r--r-- | fs/nfs/nfs4_fs.h | 1 | ||||
| -rw-r--r-- | fs/nfs/nfs4proc.c | 7 | ||||
| -rw-r--r-- | fs/nfs/nfs4state.c | 9 |
3 files changed, 11 insertions, 6 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index e8791d5a2f7a..865265bdca03 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -286,6 +286,7 @@ extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter); extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); +extern void nfs_release_seqid(struct nfs_seqid *seqid); extern void nfs_free_seqid(struct nfs_seqid *seqid); extern const nfs4_stateid zero_stateid; diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 019a009e73a0..198d51d17c13 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1835,11 +1835,10 @@ static void nfs4_close_done(struct rpc_task *task, void *data) if (calldata->arg.fmode == 0) break; default: - if (nfs4_async_handle_error(task, server, state) == -EAGAIN) { - nfs_restart_rpc(task, server->nfs_client); - return; - } + 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); } diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 6674b28ddb66..18e8b26878c5 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -765,16 +765,21 @@ struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) return new; } -void nfs_free_seqid(struct nfs_seqid *seqid) +void nfs_release_seqid(struct nfs_seqid *seqid) { if (!list_empty(&seqid->list)) { struct rpc_sequence *sequence = seqid->sequence->sequence; spin_lock(&sequence->lock); - list_del(&seqid->list); + list_del_init(&seqid->list); spin_unlock(&sequence->lock); rpc_wake_up(&sequence->wait); } +} + +void nfs_free_seqid(struct nfs_seqid *seqid) +{ + nfs_release_seqid(seqid); kfree(seqid); } |