nfsv4.1 client refuses to suspend

From: ycnian
Date: Thu Mar 21 2013 - 23:09:21 EST

nfsv4.1 client suspending fails with such info

Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
nfsv4.1-svc S ffff88007889f2e0 0 3191 2 0x00000080
ffff88007b2f3e28 0000000000000046 ffff88007b2f2010 00000000000127c0
ffff880079b08000 00000000000127c0 ffff88007b2f3fd8 00000000000127c0
ffff88007b2f3fd8 00000000000127c0 ffffffff81a14410 ffff880079b08000
Call Trace:
[<ffffffff81441396>] schedule+0x64/0x66
[<ffffffffa06a6892>] nfs41_callback_svc+0x100/0x129 [nfsv4]
[<ffffffff8104fdb8>] ? wake_up_bit+0x2a/0x2a
[<ffffffffa06a6792>] ? nfs_callback_up+0x548/0x548 [nfsv4]
[<ffffffff8104f7e0>] kthread+0xb5/0xbd
[<ffffffff8104f72b>] ? kthread_freezable_should_stop+0x65/0x65
[<ffffffff8144912c>] ret_from_fork+0x7c/0xb0
[<ffffffff8104f72b>] ? kthread_freezable_should_stop+0x65/0x65

I read such threads
[1] nfs/sunrpc: allow freezing of tasks with NFS calls in flight
[2] LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held!
and then modify nfs41_callback_svc(). It works on my machine. I don't know
the details of freezing, so I'm not sure if the modification is reasonable.
This is not a formal patch. Thanks.

Signed-off-by: Yanchuan Nian <ycnian@xxxxxxxxx>
fs/nfs/callback.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 5088b57..8addb7b 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -138,7 +138,7 @@ nfs41_callback_svc(void *vrqstp)
} else {
- schedule();
+ freezable_schedule();
finish_wait(&serv->sv_cb_waitq, &wq);

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