Ocfs2 devel - Oct 2015 - dlm: make dlm_posix_lock comply with posix file lock semanteme

Hi David and all,

After using this patch, deadlock test for posix file lock, both on local and
on cluster mode for ocfs2, acts the same now as other local fs like ext4.

But, I have no gfs2 environment to verify if this issue would happen and can
be fixed by this patch. Hope anyone working on gfs2 could comfirm on it with
me.

Thanks,
Eric

Posix file lock semanteme expects that waiting processes that request
a conflicting lock on file can be interrputed by signals like SIGALRM.
But, dlm_posix_lock puts waiting process into "Disk Sleep" status.
This failed ocfs2 test suits for posix file lock.

Replacing wait_event_killable with wait_event_interruptible can fix
this issue.

Signed-off-by: Eric Ren <zren at suse.com>
Acked-by: David Teigland <teigland at redhat.com>
---
 fs/dlm/plock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index 5532f09..88f1036 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -145,7 +145,7 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number,
struct file *file,
 	send_op(op);
 
 	if (xop->callback == NULL) {
-		rv = wait_event_killable(recv_wq, (op->done != 0));
+		rv = wait_event_interruptible(recv_wq, (op->done != 0));
 		if (rv == -ERESTARTSYS) {
 			log_debug(ls, "dlm_posix_lock: wait killed %llx",
 				  (unsigned long long)number);
-- 
2.1.4