linux-ext4 - Re: [PATCH] e2fsprogs: allow 0-length xattr values in e2fsck

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Date:	Thu, 25 Apr 2013 00:20:01 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	David Shaw <dshaw@...berwocky.com>,
	Harald Reindl <h.reindl@...lounge.net>
Subject: Re: [PATCH] e2fsprogs: allow 0-length xattr values in e2fsck

On Sun, Apr 07, 2013 at 01:42:18PM -0500, Eric Sandeen wrote:
> e2fsck thinks that this:
> 
> # touch mnt/testfile1
> # setfattr -n "user.test" mnt/testfile1
> 
> results in a filesystem with corruption:
> 
> Pass 1: Checking inodes, blocks, and sizes
> Extended attribute in inode 12 has a value size (0) which is invalid
> Clear? yes
> 
> but as far as I can tell, there is absolutely nothing wrong with
> a 0-length value on an extended attribute.  Just remove the check.
> 
> Reported-by: David Shaw <dshaw@...berwocky.com>
> Reported-by: Harald Reindl <h.reindl@...lounge.net>
> Addresses-Red-Hat-Bugzilla: #557959
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Thanks, applied.

It turns out that 0-length values applied for xattrs stored in
external xattr blocks.  0-length xattrs were only only getting
prohibited for in-inode xattrs.

						- Ted
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