linux-ext4 - Re: [PATCH] Correction to check

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Date:	Sat, 31 Mar 2007 02:16:24 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Kalpak Shah <kalpak@...sterfs.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Lustre-discuss <Lustre-discuss@...sterfs.com>
Subject: Re: [PATCH] Correction to check_filetype()

On Mar 30, 2007  20:44 -0400, Theodore Tso wrote:
> On Wed, Feb 21, 2007 at 02:45:59PM +0530, Kalpak Shah wrote:
> > If the mode of a directory gets corrupted, check_filetype() makes
> > wrong decisions for all its sub-directories. For example, using
> > debugfs we can corrupt the mode of a directory to 0140755 (i.e. a
> > socket). e2fsck will set the filetype of all its subdirectories as 6
> > (filetype for socket). All the subdirectories would be moved to
> > lost+found, and in second run of e2fsck their filetype would be set
> > back to 2.
> 
> Um, I'm not seeing this.  Using stock e2fsprogs, given the following
> test image, I'm not seeing the behavior you describe.  

The log of the e2fsck (on a test filesystem with deliberately introduced
corruption) is available at:

https://bugzilla.lustre.org/show_bug.cgi?id=11645

I've also added a testcase (created by making a parent directory with several
subdirs, then using debugfs to change the mode of the parent directory).

https://bugzilla.lustre.org/attachment.cgi?id=9958
(also attached here).

It doesn't exhibit the filetype breakage in the upstream e2fsck because the
test is run with the patch applied, but it does still show the "size is wrong
on second e2fsck" problem you observed.  The test case is created as if that
problem was also fixed already (i.e. second e2fsck is clean).

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

Download attachment "e2fsprogs-tests-f_check_filetype.patch" of type "application/octet-stream" (14690 bytes)