Patchwork [3.5.y.z,extended,stable] Patch "nfsv3: Make v3 mounts fail with ETIMEDOUTs instead EIO on" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Dec. 5, 2012, 10:31 p.m.
Message ID <1354746704-22534-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/204019/
State New
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Comments

Herton Ronaldo Krzesinski - Dec. 5, 2012, 10:31 p.m.
This is a note to let you know that I have just added a patch titled

    nfsv3: Make v3 mounts fail with ETIMEDOUTs instead EIO on

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From 41e5ef2be1f62ac89ebefd98ee4f6911b9f2e2c6 Mon Sep 17 00:00:00 2001
From: Scott Mayhew <smayhew@redhat.com>
Date: Tue, 16 Oct 2012 13:22:19 -0400
Subject: [PATCH] nfsv3: Make v3 mounts fail with ETIMEDOUTs instead EIO on
 mountd timeouts
X-Extended-Stable: 3.5

commit acce94e68a0f346115fd41cdc298197d2d5a59ad upstream.

In very busy v3 environment, rpc.mountd can respond to the NULL
procedure but not the MNT procedure in a timely manner causing
the MNT procedure to time out. The problem is the mount system
call returns EIO which causes the mount to fail, instead of
ETIMEDOUT, which would cause the mount to be retried.

This patch sets the RPC_TASK_SOFT|RPC_TASK_TIMEOUT flags to
the rpc_call_sync() call in nfs_mount() which causes
ETIMEDOUT to be returned on timed out connections.

Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 fs/nfs/mount_clnt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
1.7.9.5

Patch

diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index 8e65c7f..015f71f 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -181,7 +181,7 @@  int nfs_mount(struct nfs_mount_request *info)
 	else
 		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];

-	status = rpc_call_sync(mnt_clnt, &msg, 0);
+	status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
 	rpc_shutdown_client(mnt_clnt);

 	if (status < 0)