This is a note to let you know that I've just added the patch titled
NFSv4.1: We must release the sequence id when we fail to get a session slot
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsv4.1-we-must-release-the-sequence-id-when-we-fail-to-get-a-session-slot.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2240a9e2d013d8269ea425b73e1d7a54c7bc141f Mon Sep 17 00:00:00 2001
From: Trond Myklebust <[email protected]>
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
From: Trond Myklebust <[email protected]>
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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/nfs/nfs4proc.c | 36 +++++++++++++++++++++++-------------
1 file changed, 23 insertions(+), 13 deletions(-)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1499,9 +1499,11 @@ static void nfs4_open_prepare(struct rpc
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->o_arg.server,
&data->o_arg.seq_args,
- &data->o_res.seq_res, task))
- return;
- rpc_call_start(task);
+ &data->o_res.seq_res,
+ task) != 0)
+ nfs_release_seqid(data->o_arg.seqid);
+ else
+ rpc_call_start(task);
return;
unlock_no_action:
rcu_read_unlock();
@@ -2182,9 +2184,10 @@ static void nfs4_close_prepare(struct rp
if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
&calldata->arg.seq_args,
&calldata->res.seq_res,
- task))
- goto out;
- rpc_call_start(task);
+ task) != 0)
+ nfs_release_seqid(calldata->arg.seqid);
+ else
+ rpc_call_start(task);
out:
dprintk("%s: done!\n", __func__);
}
@@ -4407,9 +4410,11 @@ static void nfs4_locku_prepare(struct rp
calldata->timestamp = jiffies;
if (nfs4_setup_sequence(calldata->server,
&calldata->arg.seq_args,
- &calldata->res.seq_res, task))
- return;
- rpc_call_start(task);
+ &calldata->res.seq_res,
+ task) != 0)
+ nfs_release_seqid(calldata->arg.seqid);
+ else
+ rpc_call_start(task);
}
static const struct rpc_call_ops nfs4_locku_ops = {
@@ -4554,7 +4559,7 @@ static void nfs4_lock_prepare(struct rpc
/* 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;
@@ -4563,10 +4568,15 @@ static void nfs4_lock_prepare(struct rpc
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->server,
&data->arg.seq_args,
- &data->res.seq_res, task))
+ &data->res.seq_res,
+ 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)
Patches currently in stable-queue which might be from
[email protected] are
queue-3.6/nfsv3-make-v3-mounts-fail-with-etimedouts-instead-eio-on-mountd-timeouts.patch
queue-3.6/nfs-wait-for-session-recovery-to-finish-before-returning.patch
queue-3.6/nfsv4-nfs4_locku_done-must-release-the-sequence-id.patch
queue-3.6/nfsv4.1-we-must-release-the-sequence-id-when-we-fail-to-get-a-session-slot.patch
queue-3.6/nfs-show-original-device-name-verbatim-in-proc-mount-s-info.patch
queue-3.6/nfs-fix-bug-in-legacy-dns-resolver.patch
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