New: EXT4_USE_FOR_EXT23 causes ext4 partition to be mounted as ext2

http://bugzilla.kernel.org/show_bug.cgi?id=15391

Summary: EXT4_USE_FOR_EXT23 causes ext4 partition to be mounted
as ext2
Product: File System
Version: 2.5
Kernel Version: 2.6.33
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No

After setting "Use ext4 for ext2/ext3 file systems" and rebooting, my root filesystem gets mounted as ext2. When the option is disabled, everything works as expected.

Here are some relevant output:

$ grep ext[24] /etc/fstab
/dev/sda1       /boot  ext2    noauto,noatime      1 2
/dev/sda5       /      ext4    noatime             0 1

$ mount | grep ext[24]
/dev/root on / type ext2 (rw,noatime,barrier=1,data=ordered)
/dev/sda1 on /boot type ext2 (rw,noatime)

$ dmesg | grep -i ext[24]
EXT4-fs (sda5): mounted filesystem with ordered data mode
VFS: Mounted root (ext2 filesystem) readonly on device 259:131072.
EXT4-fs (sda1): mounted filesystem without journal

$ uname -a
Linux tux 2.6.33 #1 SMP PREEMPT Wed Feb 24 16:00:09 EST 2010 x86_64 Intel(R)
Core(TM)2 CPU T5300 @ 1.73GHz GenuineIntel GNU/Linux

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