linux-ext4 - Re: [PATCH v3 2/3] e2fsprogs/tune2fs: rewrite metadata checksums when resizing inode size

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Message-ID: <20141203033028.GP13618@thunk.org>
Date:	Tue, 2 Dec 2014 22:30:28 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
Cc:	linux-ext4@...r.kernel.org, darrick.wong@...cle.com
Subject: Re: [PATCH v3 2/3] e2fsprogs/tune2fs: rewrite metadata checksums
 when resizing inode size

On Fri, Nov 14, 2014 at 05:15:36PM +0800, Xiaoguang Wang wrote:
> When we use tune2fs -I new_ino_size to change inode size, if everything is OK,
> the corresponding ext4_group_desc.bg_free_blocks_count will be decreased, so
> obviously, we need to re-compute the group descriptor checksums, and the inode
> 's size has also changed, we also need to recompute the checksums of inodes for
> metadata_csum filesystem, so here we choose to call a rewrite_metadata_checksums(),
> this will fix checksum issues.
> 
> Meanwhile, the patch will trigger an existing memory write overflow, which will
> casue segfault, please see the next patch.
> 
> Signed-off-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
> Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

Applied, thanks.

					- Ted
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