linux-ext4 - Re: [PATCH 1/5 bigalloc] e2fsprogs: add tool e2wreck to corrupt fs for e2fsck testing

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Message-ID: <20111119033144.GD4130@thunk.org>
Date:	Fri, 18 Nov 2011 22:31:44 -0500
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 1/5 bigalloc] e2fsprogs: add tool e2wreck to corrupt fs
 for e2fsck testing

On Fri, Nov 18, 2011 at 06:55:26PM +0800, Robin Dong wrote:
> From: Robin Dong <sanbai@...bao.com>
> 
> We need a tool to wreck filesystem to test e2fsck
> 
> Signed-off-by: Robin Dong <sanbai@...bao.com>

I don't understand why you need this tool.  Debugfs is a more general
tool that will do pretty much everything your proposed e2wreck tool
will do.

The one exception to this is low-level extent tree modifications ---
that functionality is there in the tst_extent program, which is a
debugging program I used when developing the extent support for
e2fsck.  Go to the lib/ext2fs directory, and run "make tst_extents".
It's been on my todo list to get a more cleaner support for low-level
extent manipulation to debugfs, but I haven't gotten around to it,
since tst_extents is a serviceable enough, if hacky, substitute.

      		       		   	      	     - Ted
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