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Date:	Tue, 13 Mar 2012 08:14:12 -0400
From:	Ted Ts'o <tytso@....edu>
To:	manikanta <manikanta4u@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: EXT4-fs error

On Tue, Mar 13, 2012 at 03:09:07PM +0530, manikanta wrote:
> Hi,
> 
> Below are the error logs,
> <2>[ 4236.400030] [0:     Thread-980:11795] EXT4-fs error (device
> mmcblk0p17): ext4_map_blocks:1304: inode #2: block 3900: comm
> Thread-980: lblock 0 mapped to illegal pblock (length 1)

You have a corrupted file system.  You need to run e2fsck on it (or
reformat it if there's nothing else that you care about on that
partition).

Block 3900 is probably (I'd need to look at the output of dumpe2fs to
be sure) overlapping with the inode table, or some other file system
metadata, and the system is refusing to write to the file system lest
more data be lost.

Regards,

					- Ted
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