[DLM] reject replies to old requests

When recoveries are aborted by other recoveries we can get replies to
status or names requests that we've given up on.  This can cause problems
if we're making another request and receive an old reply.  Add a sequence
number to status/names requests and reject replies that don't match.  A
field already exists for the seq number that's used in other message
types.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ec7e401133fd..da7509986699 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -468,6 +468,7 @@ struct dlm_ls {
         struct mutex            ls_requestqueue_mutex;
         char                    *ls_recover_buf;
         int                     ls_recover_nodeid; /* for debugging */
+        uint64_t                ls_rcom_seq;
         struct list_head        ls_recover_list;
         spinlock_t              ls_recover_list_lock;
         int                     ls_recover_list_count;