Messages in this thread | | | Date | Wed, 25 Oct 2006 10:47:14 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH] Freeze bdevs when freezing processes. |
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On Wed 2006-10-25 18:38:30, David Chinner wrote: > On Wed, Oct 25, 2006 at 10:10:01AM +0200, Pavel Machek wrote: > > > Hence the only way to correctly rebuild the XFS state on resume is > > > to quiesce the filesystem on suspend and thaw it on resume so as to > > > trigger log recovery. > > > > No, during suspend/resume, memory image is saved, and no state is > > lost. We would not even have to do sys_sync(), and suspend/resume > > would still work properly. > > It seems to me that you ensure the filesystem is synced to disk and > then at some point later you record the memory state of the > filesystem, but these happen at different times. That leaves a > window for things to get out of sync again, right?
I DO NOT HAVE TO ENSURE FILESYSTEM IS SYNCED. That sys_sync() is optional.
Recording of memory state is atomic, and as long as noone writes to the disk after atomic snapshot, memory image matches what is on disk.
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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