Re: [PATCH 2/4] Btrfs: fix deadlock on sb->s_umount when doing umount

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On Tue, May 08, 2012 at 06:38:01PM +0800, Miao Xie wrote:
> I think this method can not fix the problem safely because if the other
> background threads(not the cleaner) call shrink_delalloc(), the problem
> can still occur.

And it does not indeed fix the problem completely, I found xfstests/269
hung inside cleaner and defrag (mounted with autodefrag).

david
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