linux-ext4 - Re: [PATCH v2] ext4: fix check to prevent false positive report of incorrect used inodes

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Date:   Fri, 9 Apr 2021 11:32:48 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     Zhang Yi <yi.zhang@...wei.com>, linux-ext4@...r.kernel.org,
        adilger.kernel@...ger.ca
Subject: Re: [PATCH v2] ext4: fix check to prevent false positive report of
 incorrect used inodes

On Wed, Mar 31, 2021 at 02:23:54PM +0200, Jan Kara wrote:
> On Wed 31-03-21 20:15:16, Zhang Yi wrote:
> > Commit <50122847007> ("ext4: fix check to prevent initializing reserved
> > inodes") check the block group zero and prevent initializing reserved
> > inodes. But in some special cases, the reserved inode may not all belong
> > to the group zero, it may exist into the second group if we format
> > filesystem below.
> > 
> >   mkfs.ext4 -b 4096 -g 8192 -N 1024 -I 4096 /dev/sda
> > 
> > So, it will end up triggering a false positive report of a corrupted
> > file system. This patch fix it by avoid check reserved inodes if no free
> > inode blocks will be zeroed.
> > 
> > Fixes: 50122847007 ("ext4: fix check to prevent initializing reserved inodes")
> > Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
> > Suggested-by: Jan Kara <jack@...e.cz>
> 
> Thanks! The patch looks good to me. Feel free to add:
> 
> Reviewed-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted