[Bug 15906] performance regression in "umount" of filesystems using barriers

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https://bugzilla.kernel.org/show_bug.cgi?id=15906





--- Comment #20 from Dmitry Monakhov <dmonakhov@xxxxxxxxxx>  2010-05-07 09:45:32 ---
I can confirm that Jens's fix the original regression for me,
so IMHO first part well done.

About second one.
(In reply to comment #13)
> A delalloc option. In fact dirty inode is still dirty even after first
> call of writeback_single_inode which is called from __sync_filesystem(0)
> due to delalloc allocation happen during inode write. So it takes second
> __sync_filesystem call to clear dirty flags. Currently i'm working on that
> issue. I hope i'll post a solution today.

Proposed patch was posted may be found here: 
http://marc.info/?l=linux-fsdevel&m=127322500915287&w=2

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