From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY_TIME
	inodes
Date: Thu, 20 Aug 2015 09:55:37 -0700
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Cc: Jens Axboe <axboe@kernel.dk>, Jan Kara <jack@suse.cz>,
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To: Eryu Guan <eguan@redhat.com>
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Hello, Eryu.  Thanks a lot for the trace.

So, this is from the end of the trace from the failed test.

...
    kworker/u8:1-1563  [002] 22016.987530: xfs_writepage:        dev 253:6 ino 0xef64fe pgoff 0x9ff000 size 0xa00000 offset 0 length 0 delalloc 1 unwritten 0
     kworker/2:1-49    [002] 22017.373595: xfs_setfilesize:      dev 253:6 ino 0xef6504 isize 0xa00000 disize 0x0 offset 0x0 count 10481664
...

Maybe I'm misunderstanding the code but all xfs_writepage() calls are
from unbound workqueues - the writeback workers - while
xfs_setfilesize() are from bound workqueues, so I wondered why that
was and looked at the code and the setsize functions are run off of a
separate work item which is queued from the end_bio callback and I
can't tell who would be waiting for them.  Dave, what am I missing?

Thanks.

-- 
tejun

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