On Mon, Apr 28, 2008 at 09:59:55PM +0900, Takashi Sato wrote: >> I think the protection against double freezes would be better done by >> using a trylock on bd_mount_sem. > > bd_mount_sem can protect against only freezes and cannot protect against > unfreezes. If multiple unfreezes run in parallel, the multiple up() for > bd_mount_sem might occur incorrectly. Indeed. The bit flag would fix that because unfreeze could then check for the bit beeing set first. So that's probably the easiest way to go. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
