dlm: add time stamp of blocking callback

Record the time the latest blocking callback was queued for
a lock.  This will be used for debugging in combination with
lock queue timestamp changes in the previous patch.

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

2 files changed, 3 insertions, 0 deletions

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index e69135c83d5d..0c4882951923 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -245,6 +245,7 @@ struct dlm_lkb {
         struct list_head        lkb_astqueue;   /* need ast to be sent */
         struct list_head        lkb_ownqueue;   /* list of locks for a process */
         struct list_head        lkb_time_list;
+        ktime_t                 lkb_time_bast;  /* for debugging */
         ktime_t                 lkb_timestamp;
         unsigned long           lkb_timeout_cs;
 
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index dfc57ae27045..6cfe65bbf4a2 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -318,6 +318,8 @@ static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb)
 
 static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode)
 {
+        lkb->lkb_time_bast = ktime_get();
+
         if (is_master_copy(lkb))
                 send_bast(r, lkb, rqmode);
         else