Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:51150 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758368Ab1GKR6l (ORCPT ); Mon, 11 Jul 2011 13:58:41 -0400 From: bjschuma@netapp.com To: Trond.Myklebust@netapp.com Cc: linux-nfs@vger.kernel.org, Bryan Schumaker Subject: [PATCH 2/2] NFS: Send SIGIO on lost locks Date: Mon, 11 Jul 2011 13:58:30 -0400 Message-Id: <1310407110-20600-2-git-send-email-bjschuma@netapp.com> In-Reply-To: <1310407110-20600-1-git-send-email-bjschuma@netapp.com> References: <1310407110-20600-1-git-send-email-bjschuma@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: Bryan Schumaker If the client loses a lock, we send SIGIO to the application to notify it. The application can then handle the error from there. Signed-off-by: Bryan Schumaker --- Documentation/kernel-parameters.txt | 7 +++++++ fs/nfs/nfs4_fs.h | 2 ++ fs/nfs/nfs4proc.c | 13 +++++++++++++ fs/nfs/nfs4state.c | 14 ++++++++++++++ fs/nfs/write.c | 7 +++++++ 5 files changed, 43 insertions(+), 0 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index fd248a31..988ebdc 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1593,6 +1593,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. of returning the full 64-bit number. The default is to return 64-bit inode numbers. + nfs.enable_sigio= + [NFSv4.1] enable sending SIGIO to applications. + If true, the NFS client will send SIGIO to applications + when a lost file lock is detected. If false, the client + will attempt to recover the lock. + The default is to send SIGIO. + nfs.nfs4_disable_idmapping= [NFSv4] When set, this option disables the NFSv4 idmapper on the client, but only if the mount diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index c30aed2..8fa02af 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -163,6 +163,7 @@ struct nfs4_lock_state { struct list_head ls_locks; /* Other lock stateids */ struct nfs4_state * ls_state; /* Pointer to open state */ #define NFS_LOCK_INITIALIZED 1 +#define NFS_LOCK_INVALID 2 int ls_flags; struct nfs_seqid_counter ls_seqid; struct rpc_sequence ls_sequence; @@ -346,6 +347,7 @@ extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state extern void nfs4_put_open_state(struct nfs4_state *); extern void nfs4_close_state(struct path *, struct nfs4_state *, fmode_t); extern void nfs4_close_sync(struct path *, struct nfs4_state *, fmode_t); +extern int nfs4_validate_lock_stateid(struct nfs4_state *, struct nfs_lock_context *); extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); extern void nfs4_schedule_lease_recovery(struct nfs_client *); extern void nfs4_schedule_state_manager(struct nfs_client *); diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index f37218b..8757dbd 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -4462,6 +4462,8 @@ out: } #if defined(CONFIG_NFS_V4_1) +bool enable_sigio = true; + static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) { int status; @@ -4472,10 +4474,21 @@ static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *reques status = nfs41_test_stateid(server, stateid); if (status == NFS_OK) return 0; + nfs41_free_stateid(server, stateid); lock_state->ls_seqid.flags &= !NFS_SEQID_CONFIRMED; + + if (enable_sigio) { + lock_state->ls_flags |= NFS_LOCK_INVALID; + kill_pid(request->fl_nspid, SIGIO, 1); + return 0; + } return nfs4_lock_expired(state, request); } + +module_param(enable_sigio, bool, 0644); +MODULE_PARM_DESC(enable_sigio, "Send SIGIO to an application when a lost lock" + "is detected instead of attempting recovery"); #endif static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 5d744a5..101d9b4 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -725,6 +725,20 @@ __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_p return NULL; } +int nfs4_validate_lock_stateid(struct nfs4_state *state, struct nfs_lock_context *lock_ctx) +{ + int valid = 1; + struct nfs4_lock_state *lock_state; + + spin_lock(&state->state_lock); + lock_state = __nfs4_find_lock_state(state, lock_ctx->lockowner, lock_ctx->pid, NFS4_ANY_LOCK_TYPE); + if (lock_state != NULL) + valid = (lock_state->ls_flags & NFS_LOCK_INVALID) == 0; + spin_unlock(&state->state_lock); + nfs4_put_lock_state(lock_state); + return valid; +} + /* * Return a compatible lock_state. If no initialized lock_state structure * exists, return an uninitialized one. diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 7f8732e..49ca975 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1114,7 +1114,14 @@ out: void nfs_write_prepare(struct rpc_task *task, void *calldata) { struct nfs_write_data *data = calldata; + struct nfs4_state *state = data->args.context->state; + struct nfs_lock_context *lock_context = data->args.lock_context; + if (!nfs4_validate_lock_stateid(state, lock_context)) { + task->tk_status = -EIO; + task->tk_action = NULL; + return; + } if (nfs4_setup_sequence(NFS_SERVER(data->inode), &data->args.seq_args, &data->res.seq_res, 1, task)) -- 1.7.6