linux-ext4 - Re: [PATCH 3/8] ext2: only permit ro mounts with compat features we know we don't support

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Date:	Thu, 15 Oct 2015 09:47:05 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/8] ext2: only permit ro mounts with compat features we
 know we don't support

On Thu, Oct 15, 2015 at 10:37:28AM -0400, Theodore Ts'o wrote:
> On Mon, Oct 12, 2015 at 02:54:37PM -0700, Darrick J. Wong wrote:
> > The ext2 mount code never checks the compat features against the ones
> > it knows about.  This is correct behavior since compat features are
> > supposed to be rw-compatible with old drivers; however, for certain
> > configurations (journalled rootfs) the admin is unlikely to want
> > no-journal mode.  Since we changed the default probe order to put ext4
> > first, we can make ext2.ko only allow readonly mounts if has_journal is
> > found.
> > 
> > (Remember, this only affects mounting ext3 filesystems on ext2.ko.)
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> 
> I'm not sure that we need this patch.  If someone explicitly requests
> a r/w mount of an ext3 file system using ext2, we should let it.
> After changing the default probe order, the only time your change
> would prohibit the mounting of an ext3 file system is when the system
> administrator has explicitly mentioned the file system type in command
> line.

Okay, let's drop it then.

--D

> 
> 						- Ted
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