protocol: Add framework to send transaction id with recall

Issue:
The upcall(cache invalidation/recall) event is sent from the bricks
to clients. In AFR/EC setup, it can so happen that all the bricks
will send the upcall for the same event, and if AFR/EC doesn't filter
out these duplicate notifications, the logic above cluster xlators
can fail.

Solution:
Use transaction id to filter out duplicate notifications.

This patch adds framework for duplicate notifications.
AFR/EC can build up on this patch for deduping the notifications

Change-Id: I66b08e63b8799bc5932f2b2545376138a5701168
BUG: 1319992
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: http://review.gluster.org/14647
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/libglusterfs/src/upcall-utils.h b/libglusterfs/src/upcall-utils.h
index 33db4b273a1..f4b15e3507c 100644
--- a/libglusterfs/src/upcall-utils.h
+++ b/libglusterfs/src/upcall-utils.h
@@ -78,8 +78,10 @@ struct gf_upcall_cache_invalidation {
 };
 
 struct gf_upcall_recall_lease {
-        uint32_t  lease_type;
-        /* TODO: Add the lease type it can be downgraded to */
+        uint32_t  lease_type; /* Lease type to which client can downgrade to*/
+        uuid_t    tid;        /* transaction id of the fop that caused
+                                 the recall */
+        dict_t   *dict;
 };
 
 #endif /* _UPCALL_UTILS_H */