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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-04-21 18:01:06 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-07 19:57:26 -0700
commit3b5f7654971e0dcb6c422d14cbae7309686bb344 (patch)
tree971b0f15ca8856e3464e23f6e6e0b7a2054ef6cc
parenta35089a9cc44f621e58af899b3483d206bb89284 (diff)
LOCKD: Ensure that nlmclnt_block resets block->b_status after a server reboot
commit 1dfd89af8697a299e7982ae740d4695ecd917eef upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/lockd/clntlock.c3
-rw-r--r--fs/lockd/clntproc.c3
2 files changed, 3 insertions, 3 deletions
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 8d4ea8351e3d..de889223174a 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -141,6 +141,9 @@ 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;
}
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 5ee055ef9dc7..e374050a911c 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -550,9 +550,6 @@ 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;
}