linux-ext4 - Re: [PATCH] ext4: Fix data corruption when writing to prealloc area

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Date:	Fri, 18 Jul 2008 12:03:40 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org,
	Shehjar Tikoo <shehjart@....unsw.edu.au>
Subject: Re: [PATCH] ext4: Fix data corruption when writing to prealloc area


在 2008-07-18五的 10:22 -0700，Mingming Cao写道：
> 在 2008-07-18五的 10:02 -0700，Mingming Cao写道：
> > I tried this patch, with nodelalloc, the kernel did not crash! Previous
> > it crashes in a few minutes.
> > 
> >  but the test did not stop after fill the file by specified 2G size
> > 
> > 
> > I noticed the write() to write to the last fallocate extent(up to 2G)
> > returns junk value.
> > 
> > 
> > The testcase I got from Shehjart (who originally reported the problem)
> > is  
> > 
> > http://www.gelato.unsw.edu.au/~shehjart/writefallocate.c
> > 
> 
> I forget to mention that I modify the test slight to call fallocate()
> with default mode (expnd size) instead of keep size.
> 

Oh, it's the file size problem for the 2 GB barrier, the latest test
source git tree  has fixed this,.  With the patch ext4 runs fine with
both KEEP_SIZE mode and ALLOCATE mode.

Mingming

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