From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: jffs2 filesystem/flash data integrity
From: David Woodhouse <dwmw2@infradead.org>
To: Manoj <manoj23@gmail.com>
In-Reply-To: <1c3f4270904181955g28d25ef5nef3cc3001c0d3a06@mail.gmail.com>
References: <1c3f4270904181955g28d25ef5nef3cc3001c0d3a06@mail.gmail.com>
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Date: Sun, 19 Apr 2009 08:33:03 +0100
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On Sat, 2009-04-18 at 19:55 -0700, Manoj wrote:
> Hi,
> 
> I have a jffs2 filesystem on NAND flash. After mounting the jffs2 fs,
> I create a 2MB file and make a copy of it using "cp" command. When I
> do a "diff" between two files, the files are same. Now, I unmount the
> fs and re-mount it. When I do a "diff" between the two files, they
> differ. Looking at the difference, I see that around 4K of data in one
> file has 0s in it. This 4K hole can be anywhere in the file.  There is
> no issue with a 1MB file.

Please reproduce with 'CONFIG_JFFS2_FS_DEBUG=1', capturing all kernel
message over a serial console. Also, take an image of the flash before
you remount it. Let me have both.

-- 
dwmw2