| Date | Fri, 17 May 2013 22:17:00 -0400 | From | Steven Rostedt <> | Subject | [ 063/136 ] LOCKD: Ensure that nlmclnt_block resets block->b_status after a server reboot |
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3.6.11.4 stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust <Trond.Myklebust@netapp.com>
[ Upstream commit 1dfd89af8697a299e7982ae740d4695ecd917eef ]
After a server reboot, the reclaimer thread will recover all the existing locks. For locks that are blocked, however, it will change the value of block->b_status to nlm_lck_denied_grace_period in order to signal that they need to wake up and resend the original blocking lock request.
Due to a bug, however, the block->b_status never gets reset after the blocked locks have been woken up, and so the process goes into an infinite loop of resends until the blocked lock is satisfied.
Reported-by: Marc Eshel <eshel@us.ibm.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- fs/lockd/clntlock.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c index ca0a080..193f04c 100644 --- a/fs/lockd/clntlock.c +++ b/fs/lockd/clntlock.c @@ -144,6 +144,9 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout) timeout); if (ret < 0) return -ERESTARTSYS; + /* Reset the lock status after a server reboot so we resend */ + if (block->b_status == nlm_lck_denied_grace_period) + block->b_status = nlm_lck_blocked; req->a_res.status = block->b_status; return 0; } -- 1.7.10.4
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