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LOCKD: Ensure that nlmclnt_block resets block->b_status after a server reboot 

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
This commit is contained in:
Trond Myklebust 2013-04-21 18:01:06 -04:00
parent 8e472f33b5
commit 1dfd89af86
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/lockd/clntlock.c
View File

@ -144,6 +144,9 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
timeout); timeout);
if (ret < 0) if (ret < 0)
return -ERESTARTSYS; 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; req->a_res.status = block->b_status;
return 0; return 0;
} }

3
fs/lockd/clntproc.c
View File

@ -550,9 +550,6 @@ again:
status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT); status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
if (status < 0) if (status < 0)
break; 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) if (resp->status != nlm_lck_blocked)
break; break;
} }