[DLM] saved dlm message can be dropped

dlm_receive_message() returns 0 instead of returning 'error'.  What would
happen is that process_requestqueue would take a saved message off the
requestqueue and call receive_message on it.  receive_message would then
see that recovery had been aborted, set error to EINTR, and 'goto out',
expecting that the error would be returned.  Instead, 0 was always
returned, so process_requestqueue would think that the message had been
processed and delete it instead of saving it to process next time.  This
means the message (usually an unlock in my tests) would be lost.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6ad2b8eb96a5102ef6673a61daa5c600695832a5..7c7ac2aaa8b1ca2a8a317c7343af3286f2b2fe99 100644 (file)
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -3018,7 +3018,7 @@ int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery)
 {
        struct dlm_message *ms = (struct dlm_message *) hd;
        struct dlm_ls *ls;
-       int error;
+       int error = 0;
 
        if (!recovery)
                dlm_message_in(ms);
@@ -3135,7 +3135,7 @@ int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery)
  out:
        dlm_put_lockspace(ls);
        dlm_astd_wake();
-       return 0;
+       return error;
 }