[BUG] fs/dcache: might_sleep is called under a spinlock

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To: viro@xxxxxxxxxxxxxxxxxx
Subject: [BUG] fs/dcache: might_sleep is called under a spinlock
From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
Date: Tue, 3 Oct 2017 10:38:25 +0800
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

According to fs/dcache.c, might_sleep is called under a spinlock,
and the function call path is:
d_prune_aliases (acquire the spinlock)
  dput
    might_sleep

This bug is found by my static analysis tool and my code review.
A possible fix is to remove might_sleep in dput.

Thanks,
Jia-Ju Bai

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