Commit 403f24d3 authored by Josh Durgin's avatar Josh Durgin Committed by Alex Elder
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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: default avatarJosh Durgin <josh.durgin@dreamhost.com>
Reviewed-by: default avatarAlex Elder <elder@dreamhost.com>
Reviewed-by: default avatarYehuda 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: