[dm-devel] Re: [PATCH 2.6.19 5/5] fs: freeze_bdev with semaphore not mutex

[Pavel Machek]

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?

						Pavel
-- 
Thanks for all the (sleeping) penguins.