Commit 403f24d3 authored Dec 05, 2011 by Josh Durgin Committed by Alex Elder May 14, 2012

rbd: protect read of snapshot sequence number



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.durgin@dreamhost.com>
Reviewed-by: Alex Elder <elder@dreamhost.com>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>

parent 50f7c4c9

drivers/block/rbd.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1684,7 +1684,9 @@ static int rbd_header_add_snap(struct rbd_device *dev,
		if (ret < 0)
		return ret;

		down_write(&dev->header_rwsem);
		dev->header.snapc->seq = new_snapid;
		up_write(&dev->header_rwsem);

		return 0;
		bad: