Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH 2.6.19 5/5] fs: freeze_bdev with semaphore not mutex | Date | Thu, 9 Nov 2006 16:52:33 +0100 |
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Hi,
On Wednesday, 8 November 2006 19:09, Pavel Machek wrote: > Hi! > > > > swsusp-freeze-filesystems-during-suspend-rev-2.patch > > > > > > I think you need to give more thought to device-mapper > > > interactions here. If an underlying device is suspended > > > by device-mapper without freezing the filesystem (the > > > normal state) and you issue a freeze_bdev on a device > > > above it, the freeze_bdev may never return if it attempts > > > any synchronous I/O (as it should). > > > > Well, it looks like the interactions with dm add quite a bit of > > complexity here. > > What about just fixing xfs (thou shall not write to disk when kernel > threads are frozen), and getting rid of blockdev freezing?
Well, first I must admit you were absolutely right being suspicious with respect to this stuff.
OTOH I have no idea _how_ we can tell xfs that the processes have been frozen. Should we introduce a global flag for that or something?
Rafael
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