From: Mark Lord <kernel@teksavvy.com>
To: Linux Kernel <linux-kernel@vger.kernel.org>,
linux-ext4@vger.kernel.org, "Theodore Ts'o" <tytso@mit.edu>
Subject: CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4
Date: Tue, 12 Apr 2011 13:25:08 -0400 [thread overview]
Message-ID: <4DA48AF4.5080803@teksavvy.com> (raw)
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.
Eg. I test it by building my own kernel (2.6.38.2), with ext4 built-in,
no initramfs required, and boot:
root=/dev/sda1 init=/bin/bash
...
$ mount /proc
$ cat /proc/mounts
/dev/root / ext2 ro,relatime,barrier=1,data=ordered 0 0
So.. it shows "ext2" instead of "ext4". That really looks like a bug.
Especially since it appears to be using journaling regardless.
Building the kernel without CONFIG_EXT4_USE_FOR_EXT23
results in a proper "ext4" mount entry in /proc/mounts.
next reply other threads:[~2011-04-12 17:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-12 17:25 Mark Lord [this message]
2011-04-13 0:49 ` CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4 Ted Ts'o
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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