Re: [RFC][PATCH] Re: [BUG] ext4: cannot unfreeze a filesystem due to a deadlock

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On Mon, May 02, 2011 at 03:16:19PM +0200, Jan Kara wrote:
> Dave, Christoph, any opinions on this?

The busyloop in xfs_quiesce_attr which waits for all active transactions
to finish is supposed to fix this issue.

Note that XFS traditionally expects a two stage freeze process where
we first freeze new VFS-level writes, then flush the caches and then
stop transactions, wait for them to finish and do the remainder of
the freeze process, but I really messed that process up when moving
the sequence to generic code.  Funnily enough it seems to work
neverless.

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