linux-kernel - Re: [PATCH] deadlock when swapping to FAT

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Message-ID: <87zlfqohfn.fsf@devron.myhome.or.jp>
Date:	Fri, 13 Mar 2009 01:05:16 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] deadlock when swapping to FAT

Mikulas Patocka <mpatocka@...hat.com> writes:

> swapon will deadlock when an attempt to swap to a file on FAT filesystem 
> is made. swapon holds i_mutex and FAT bmap is attempting to take it again.
>
> This bug was introduced somewhere between 2.6.27 and 2.6.28.
>
> No other filesystem is taking i_mutex in bmap, so I removed it as well.
>
> Note that there are many other cases where bmap can race with truncate in 
> almost all the filesystems. They don't impose an immediate threat because 
> bmap can be only called by root. These problems should be solved in a 
> generic way, not in individual filesystems.

Thanks. This was fixed recently with a bit different way.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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