From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH 3/8] ext2: only permit ro mounts with compat features we know we don't support
Date: Thu, 15 Oct 2015 09:47:05 -0700 [thread overview]
Message-ID: <20151015164705.GR10390@birch.djwong.org> (raw)
In-Reply-To: <20151015143728.GG17329@thunk.org>
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@oracle.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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next prev parent reply other threads:[~2015-10-15 16:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 21:54 [PATCH 0/8] ext4/jbd2: misc fixes and cleanups; save checksum seeds Darrick J. Wong
2015-10-12 21:54 ` [PATCH 1/8] jbd2: gate checksum calculations on crc driver presence, not sb flags Darrick J. Wong
2015-10-15 14:32 ` Theodore Ts'o
2015-10-12 21:54 ` [PATCH 2/8] ext4: promote ext4 over ext2 in the default probe order Darrick J. Wong
2015-10-15 14:34 ` Theodore Ts'o
2015-10-12 21:54 ` [PATCH 3/8] ext2: only permit ro mounts with compat features we know we don't support Darrick J. Wong
2015-10-15 14:37 ` Theodore Ts'o
2015-10-15 16:47 ` Darrick J. Wong [this message]
2015-10-12 21:54 ` [PATCH 4/8] ext4: store checksum seed in superblock Darrick J. Wong
2015-10-15 14:45 ` Theodore Ts'o
2015-10-18 1:19 ` Theodore Ts'o
2015-10-18 1:23 ` Darrick J. Wong
2015-10-18 2:14 ` Theodore Ts'o
2015-10-12 21:54 ` [PATCH 5/8] ext4: call out CRC and corruption errors with specific error codes Darrick J. Wong
2015-10-15 14:47 ` Theodore Ts'o
2015-10-12 21:54 ` [PATCH 6/8] ext4: make the bitmap read routines return real " Darrick J. Wong
2015-10-15 14:57 ` Theodore Ts'o
2015-10-15 15:02 ` Darrick J. Wong
2015-10-15 16:36 ` [PATCH v2 " Darrick J. Wong
2015-10-18 1:45 ` Theodore Ts'o
2015-10-12 21:55 ` [PATCH 7/8] ext4: clean up feature test macros with predicate functions Darrick J. Wong
2015-10-15 15:12 ` Theodore Ts'o
2015-10-12 21:55 ` [PATCH 8/8] jbd2: " Darrick J. Wong
2015-10-15 15:12 ` Theodore Ts'o
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