linux-ext4 - Re: [PATCH 2/2 bigalloc] ext4: modify offset to cluster in ext4_valid_block

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Date:	Wed, 10 Aug 2011 22:51:52 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Robin Dong <hao.bigrat@...il.com>
Cc:	linux-ext4@...r.kernel.org, Robin Dong <sanbai@...bao.com>
Subject: Re: [PATCH 2/2 bigalloc] ext4: modify offset to cluster in
 ext4_valid_block_bitmap

On Thu, Aug 04, 2011 at 11:48:01AM +0800, Robin Dong wrote:
> From: Robin Dong <sanbai@...bao.com>
> 
> When I run a test application on ext4 of bigalloc, and also a daemon
> which run "echo 3 > /proc/sys/vm/drop_caches" every 2 seconds,
> the kernel report:
> 
> 15319.557145] EXT4-fs error (device sda4): ext4_valid_block_bitmap:324: comm dir_tree: Invalid block bitmap - block_group = 6, block = 3145730
> 
> The reason is ext4_valied_block_bitmap has not be modified for cluster.
> 
> Signed-off-by: Robin Dong <sanbai@...bao.com>
> Cc: Ted Ts'o <tytso@....edu>

Yep, this looks like a bug --- I'm curious, though --- this is
something I don't run into because I use mke2fs -t ext4 which sets the
flex_bg feature.  Is there some reason you're not using flex_bg on
your file systems?

					- Ted
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