rbd: add new snapshots at the tail
This fixes a bug that went in with this commit:
commit f6e0c99092cca7be00fca4080cfc7081739ca544
Author: Alex Elder <elder@inktank.com>
Date: Thu Aug 2 11:29:46 2012 -0500
rbd: simplify __rbd_init_snaps_header()
The problem is that a new rbd snapshot needs to go either after an
existing snapshot entry, or at the *end* of an rbd device's snapshot
list. As originally coded, it is placed at the beginning. This was
based on the assumption the list would be empty (so it wouldn't
matter), but in fact if multiple new snapshots are added to an empty
list in one shot the list will be non-empty after the first one is
added.
This addresses http://tracker.newdream.net/issues/3063
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 14bf83b..2b40a4a 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2187,7 +2187,7 @@
if (snap)
list_add_tail(&new_snap->node, &snap->node);
else
- list_add(&new_snap->node, head);
+ list_add_tail(&new_snap->node, head);
} else {
/* Already have this one */