LU-274 Update LVB from disk when glimpse callback return error

There are various cases that glimpse callback return errors,
we should update the LVB from disk whenever the glimpse ast failed.

Signed-off-by: Niu Yawei <niu@whamcloud.com>
Change-Id: I120ebcb6254cee5b797c09545d29cc7dcc12a5d2
Reviewed-on: http://review.whamcloud.com/583
Tested-by: Hudson
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>

diff --git a/lustre/ldlm/ldlm_lockd.c b/lustre/ldlm/ldlm_lockd.c
index 101a848..6234ccf 100644 (file)
--- a/lustre/ldlm/ldlm_lockd.c
+++ b/lustre/ldlm/ldlm_lockd.c
@@ -966,12 +966,20 @@ int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
 
         rc = ptlrpc_queue_wait(req);
-        if (rc == -ELDLM_NO_LOCK_DATA)
+        /* Update the LVB from disk if the AST failed (this is a legal race)
+         *
+         * - Glimpse callback of local lock just return -ELDLM_NO_LOCK_DATA.
+         * - Glimpse callback of remote lock might return -ELDLM_NO_LOCK_DATA
+         *   when inode is cleared. LU-274
+         */
+        if (rc == -ELDLM_NO_LOCK_DATA) {
                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
-        else if (rc != 0)
+                ldlm_res_lvbo_update(res, NULL, 1);
+        } else if (rc != 0) {
                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
-        else
+        } else {
                 rc = ldlm_res_lvbo_update(res, req, 1);
+        }
 
         ptlrpc_req_finished(req);
         if (rc == -ERESTART)