Messages in this thread | | | Date | Fri, 29 Jun 2007 14:55:53 +1000 | From | David Chinner <> | Subject | Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume |
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On Wed, Jun 27, 2007 at 08:49:24PM +0000, Pavel Machek wrote: > Hi! > > > FWIW, I'm on record stating that "sync" is not sufficient to quiesce an XFS > > filesystem for a suspend/resume to work safely and have argued that the only > > Hmm, so XFS writes to disk even when its threads are frozen?
They issue async I/O before they sleep and expects processing to be done on I/O completion via workqueues.
> > safe thing to do is freeze the filesystem before suspend and thaw it after > > resume. This is why I originally asked you to test that with the other problem > > Could you add that to the XFS threads if it is really required? They > do know that they are being frozen for suspend.
We don't suspend the threads on a filesystem freeze - they continue run. A filesystem freeze guarantees the filesystem clean and that the in memory state matches what is on disk. It is not possible for the filesytem to issue I/O or have outstanding I/O when it is in the frozen state, so the state of the threads and/or workqueues does not matter because they will be idle.
Cheers,
Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - 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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