fd-lk: implement new method to check for empty fd_lk_ctx_t

to use this in fuse-bridge, to conditionally attempt lock migration
to new graph.

Change-Id: I9b10d5839c4ac6051c75e4c020371391cd886ac8
BUG: 808400
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/4455
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/libglusterfs/src/fd-lk.c b/libglusterfs/src/fd-lk.c
index 0c439fe6e93..fff4aa9966c 100644
--- a/libglusterfs/src/fd-lk.c
+++ b/libglusterfs/src/fd-lk.c
@@ -468,3 +468,21 @@ fd_lk_insert_and_merge (fd_t *fd, int32_t cmd,
 out:
         return ret;
 }
+
+
+gf_boolean_t
+fd_lk_ctx_empty (fd_lk_ctx_t *lk_ctx)
+{
+	gf_boolean_t verdict = _gf_true;
+
+	if (!lk_ctx)
+		return _gf_true;
+
+	LOCK (&lk_ctx->lock);
+	{
+		verdict = list_empty (&lk_ctx->lk_list);
+	}
+	UNLOCK (&lk_ctx->lock);
+
+	return verdict;
+}