Kyle Moffett wrote: > On May 03, 2007, at 11:10:47, Pavel Machek wrote: >> How mature is freezing filesystems -- will it work on at least ext2/3 >> and vfat? > > I'm pretty sure it works on ext2/3 and xfs and possibly others, I don't > know either way about VFAT though. Essentially the "freeze" part > involves telling the filesystem to sync all data, flush the journal, and > mark the filesystem clean. The intent under dm/LVM was to allow you to > make snapshots without having to fsck the just-created snapshot before > you mounted it. > >> What happens if you try to boot and filesystems are frozen from >> previous run? > > If you're just doing a fresh boot then the filesystem is already clean > due to the dm freeze and so it mounts up normally. All you need to do > then is have a little startup script which purges the saved image before > you fsck or remount things read-write since either case means the image > is no longer safe to resume.
Wouldn't it be better if freeze wrote a freeze-ID to the fs and returned it? This would naturally be kept in the image and a UUID mismatch would be detectable - seems safer and more flexible than 'a script'. "This isn't the freeze you're looking for, move along" David - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/