ceph: eliminate the recursion when rebuilding the snap context

Use a list instead of recursion to avoid possible stack overflow.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index a2caa7beca4f..ef9f32ec905e 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -883,6 +883,8 @@ struct ceph_snap_realm {
 
 	struct list_head dirty_item;     /* if realm needs new context */
 
+	struct list_head rebuild_item;   /* rebuild snap realms _downward_ in hierarchy */
+
 	/* the current set of snaps for this realm */
 	struct ceph_snap_context *cached_context;