linux-kernel - [ 076/153] NLM: Ensure that we resend all pending blocking locks after a reclaim

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Message-Id: <20130304033715.075678690@decadent.org.uk>
Date:	Mon, 04 Mar 2013 03:38:23 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Wangyuan Zhang <Wangyuan.Zhang@...app.com>
Subject: [ 076/153] NLM: Ensure that we resend all pending blocking locks after a
 reclaim

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <Trond.Myklebust@...app.com>

commit 666b3d803a511fbc9bc5e5ea8ce66010cf03ea13 upstream.

Currently, nlmclnt_lock will break out of the for(;;) loop when
the reclaimer wakes up the blocking lock thread by setting
nlm_lck_denied_grace_period. This causes the lock request to fail
with an ENOLCK error.
The intention was always to ensure that we resend the lock request
after the grace period has expired.

Reported-by: Wangyuan Zhang <Wangyuan.Zhang@...app.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/lockd/clntproc.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -551,6 +551,9 @@ again:
 		status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
 		if (status < 0)
 			break;
+		/* Resend the blocking lock request after a server reboot */
+		if (resp->status ==  nlm_lck_denied_grace_period)
+			continue;
 		if (resp->status != nlm_lck_blocked)
 			break;
 	}


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