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Date:	Thu, 13 Sep 2012 18:46:21 +0800
From:	Zheng Liu <>
To:	Dmitry Monakhov <>
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. :-)

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