From: Ted Ts'o <tytso@mit.edu>
To: Mark Lord <kernel@teksavvy.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>, linux-ext4@vger.kernel.org
Subject: Re: CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4
Date: Tue, 12 Apr 2011 20:49:38 -0400 [thread overview]
Message-ID: <20110413004938.GE3682@thunk.org> (raw)
In-Reply-To: <4DA48AF4.5080803@teksavvy.com>
On Tue, Apr 12, 2011 at 01:25:08PM -0400, Mark Lord wrote:
> Ted et al.
>
> I've only just noticed this, so I have no idea how long it has been this way.
>
> When I build a kernel with CONFIG_EXT4_USE_FOR_EXT23=y and boot from it,
> the ext4 root filesystem shows up as "ext2" mode, rather than "ext4".
>
> This looks very wrong to me, and quite dangerous.
It's a cosemtic bug, I agree, but I'm not sure why you consider it
dangerous.
CONFIG_EXT4_USE_FOR_EXT23 means that ext4 registers itself as ext2
and/or ext3, if ext2 and/or ext3 are not configured into the kernel.
Since the kernel tries to mount the file system as ext2, ext3, and
then ext4, and uses whichever one works first.
- Ted
next prev parent reply other threads:[~2011-04-13 0:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-12 17:25 CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4 Mark Lord
2011-04-13 0:49 ` Ted Ts'o [this message]
2011-04-13 14:05 ` Mark Lord
2011-04-13 14:10 ` Mark Lord
2011-04-13 21:00 ` Theodore Tso
2011-04-13 22:30 ` Joel Becker
2011-04-14 15:41 ` [PATCH] ext4: register ext2 and ext3 alias after ext4 Milton Miller
2011-04-15 1:07 ` Mark Lord
2011-04-17 2:01 ` Ted Ts'o
2011-04-14 1:34 ` CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4 Mark Lord
2011-04-14 12:47 ` Theodore Tso
2011-04-13 16:45 ` John Stoffel
2011-04-13 18:17 ` Ric Wheeler
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