linux-ext4 - Re: [PATCH 11/18] libext2/fsck: correctly preserve fs flags when modifying ignore-csum-error flag

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Message-ID: <20140727232746.GZ6725@thunk.org>
Date:	Sun, 27 Jul 2014 19:27:46 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 11/18] libext2/fsck: correctly preserve fs flags when
 modifying ignore-csum-error flag

On Fri, Jul 25, 2014 at 05:34:47PM -0700, Darrick J. Wong wrote:
> nor is it correct
> to assume that we can unconditionally set (or clear) the "ignore csum
> error" flag bit.

For functions inside e2fsck, why is this true?  All of the places
where we are are EXT2_FLAG_IGNORE_CSUM_ERRORS are places where we set
it, and then clear it after an ext2 call.  So as near as I can tell it
shouldn't matter.

I can understand why we need to be careful for functions inside
libext2fs, but in that particular case, none of the downstream
functions of ext2fs_read_inode_full() modify fs->flags.

So I'm really puzzled what problem this patch actually solves.  Was
this a theoretical concern, or was there something I missed?

       		   	       	   	 - Ted
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