linux-ext4 - Re: [PATCH 4/7] ext4: fsync should wait for DIO writers

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Message-ID: <20120913104621.GC11330@gmail.com>
Date:	Thu, 13 Sep 2012 18:46:21 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz,
	wenqing.lz@...bao.com
Subject: Re: [PATCH 4/7] ext4: fsync should wait for DIO writers

On Sun, Sep 09, 2012 at 09:27:11PM +0400, Dmitry Monakhov wrote:
> fsync and punch_hole are the places where we have to wait for all
> existing writers (writeback, aio, dio), but currently we simply
> flush pended end_io request which is not sufficient.
> Even more i_mutex is not holded while punch_hole which obviously
> result in dangerous data corruption due to write-after-free.

Hi Dmitry,

Lukas already has a patch to take i_mutex locking before punching a
hole.  Just a reminding. :-)

https://patchwork.kernel.org/patch/1247271/

Regards,
Zheng
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