From d6d5a8514ee883d824427e5a70103c180ffbb6e9 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 29 Oct 2012 18:37:40 -0400 Subject: NFSv4.1: We must release the sequence id when we fail to get a session slot commit 2240a9e2d013d8269ea425b73e1d7a54c7bc141f upstream. If we do not release the sequence id in cases where we fail to get a session slot, then we can deadlock if we hit a recovery scenario. Signed-off-by: Trond Myklebust [bwh: Backported to 3.2: - Adjust context - nfs4_setup_sequence() has an additional 'cache_reply' parameter] Signed-off-by: Ben Hutchings --- fs/nfs/nfs4proc.c | 36 +++++++++++++++++++++++------------- 1 file changed, 23 insertions(+), 13 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 2468fac28c03..4f07b56610eb 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1463,9 +1463,11 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata) data->timestamp = jiffies; if (nfs4_setup_sequence(data->o_arg.server, &data->o_arg.seq_args, - &data->o_res.seq_res, 1, task)) - return; - rpc_call_start(task); + &data->o_res.seq_res, + 1, task) != 0) + nfs_release_seqid(data->o_arg.seqid); + else + rpc_call_start(task); return; unlock_no_action: rcu_read_unlock(); @@ -2045,9 +2047,10 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) calldata->timestamp = jiffies; if (nfs4_setup_sequence(NFS_SERVER(calldata->inode), &calldata->arg.seq_args, &calldata->res.seq_res, - 1, task)) - return; - rpc_call_start(task); + 1, task) != 0) + nfs_release_seqid(calldata->arg.seqid); + else + rpc_call_start(task); } static const struct rpc_call_ops nfs4_close_ops = { @@ -4163,9 +4166,11 @@ static void nfs4_locku_prepare(struct rpc_task *task, void *data) calldata->timestamp = jiffies; if (nfs4_setup_sequence(calldata->server, &calldata->arg.seq_args, - &calldata->res.seq_res, 1, task)) - return; - rpc_call_start(task); + &calldata->res.seq_res, + 1, task) != 0) + nfs_release_seqid(calldata->arg.seqid); + else + rpc_call_start(task); } static const struct rpc_call_ops nfs4_locku_ops = { @@ -4309,7 +4314,7 @@ static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) /* 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) - return; + 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; @@ -4318,10 +4323,15 @@ static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) data->timestamp = jiffies; if (nfs4_setup_sequence(data->server, &data->arg.seq_args, - &data->res.seq_res, 1, task)) + &data->res.seq_res, + 1, task) == 0) { + rpc_call_start(task); return; - rpc_call_start(task); - dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); + } + 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) -- cgit v1.2.3