3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Josh Durgin <josh.dur...@dreamhost.com>
(cherry picked from commit 403f24d3d51760a8b9368d595fa5f48c309f1a0f)
This is updated whenever a snapshot is added or deleted, and the
snapc pointer is changed with every refresh of the header.
Signed-off-by: Josh Durgin <josh.dur...@dreamhost.com>
Reviewed-by: Alex Elder <el...@dreamhost.com>
Reviewed-by: Yehuda Sadeh <yeh...@hq.newdream.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/block/rbd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1683,7 +1683,9 @@ static int rbd_header_add_snap(struct rb
if (ret < 0)
return ret;
- dev->header.snapc->seq = new_snapid;
+ down_write(&dev->header_rwsem);
+ dev->header.snapc->seq = new_snapid;
+ up_write(&dev->header_rwsem);
return 0;
bad:
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