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

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Message-ID: <Pine.LNX.4.64.0903170815110.26754@hs20-bc2-1.build.redhat.com>
Date:	Tue, 17 Mar 2009 08:23:28 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] deadlock when swapping to FAT

On Sun, 15 Mar 2009, OGAWA Hirofumi wrote:

> Mikulas Patocka <mpatocka@...hat.com> writes:
> 
> > Note that the same race condition is happening in all the other 
> > filesystems. Maybe move that i_alloc_sem up to ->bmap method caller?
> 
> It can be. However, I guess locking strategy would be per
> filesystems. Because the fs may be using i_alloc_sem in get_block
> already.

Which ones take it in get_block? I grepped for i_alloc_sem and don't see 
them. Besides, it is mostly taken only for read and recursive taking of 
read-lock for read is allowed. It is taken for writes only in truncate.

Mikulas

> Thanks.
> -- 
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> 
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