On Fri, Jun 29, 2007 at 12:16:44AM +0200, Rafael J. Wysocki wrote:

There are two solutions possible, IMO.  One would be to make these workqueues
freezable, which is possible, but hacky and Oleg didn't like that very much.
The second would be to freeze XFS from within the hibernation code path,
using freeze_bdev().

The second is much more likely to work reliably. If freezing the
filesystem leaves something in an inconsistent state, then it's
something I can reproduce and debug without needing to
suspend/resume.

FWIW, don't forget you need to thaw the filesystem on resume.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group