linux-ext4 - ext4 fails on ext2 filesystems

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Message-ID: <20090118013516.GA4876@alea.gnuu.de>
Date:	Sun, 18 Jan 2009 02:35:16 +0100
From:	Jörg Sommer <joerg@...a.gnuu.de>
To:	linux-ext4@...r.kernel.org
Subject: ext4 fails on ext2 filesystems

Hi,

I've an ext2 filesystem as root filesystem, because it's mounted readonly
for the most part. I've built in the support for ext[234] in the kernel.
Ext4 takes precedence over ext2 and it mounts the root filesystem:

[    6.184751] EXT4-fs: delayed allocation enabled
[    6.191487] EXT4-fs: mballoc enabled
[    6.197710] EXT4-fs: mounted filesystem hda3 without journal
[    6.203948] VFS: Mounted root (ext4 filesystem) readonly on device 3:3.

% mount | grep root
rootfs on / type rootfs (rw)
/dev/root on / type ext4 (ro,noatime,errors=remount-ro,barrier=1,data=writeback)

But when remounting the filesystem read/write and changing a file, the
changes are written to the filesystem, but it's remounted readonly
immediatly. I've set the mount option remount-ro.

[  203.082300] EXT4 FS on hda3, no journal
[  205.746713] EXT4-fs error (device hda3): ext4_free_data: circular indirect block detected, inode=165056, block=184476

% cat /proc/cpuinfo
processor	: 0
cpu		: 7455, altivec supported
clock		: 606.000000MHz
revision	: 3.3 (pvr 8001 0303)
bogomips	: 36.73
timebase	: 18432000
platform	: PowerMac
model		: PowerBook6,3
machine		: PowerBook6,3
motherboard	: PowerBook6,3 MacRISC3 Power Macintosh
detected as	: 287 (iBook G4)
pmac flags	: 0000001b
L2 cache	: 256K unified
pmac-generation	: NewWorld
Memory		: 640 MB

% uname -a
Linux ibook 2.6.29-rc2 #1 Sat Jan 17 18:04:20 CET 2009 ppc GNU/Linux

% tune2fs -l /dev/root
tune2fs 1.41.3 (12-Oct-2008)
Filesystem volume name:   Linux Root
Last mounted on:          <not available>
Filesystem UUID:          2a16f78b-dde3-4224-bb23-6303c0d69c92
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      ext_attr resize_inode dir_index filetype sparse_super large_file
Filesystem flags:         unsigned_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              327680
Block count:              1310520
Reserved block count:     65526
Free blocks:              294862
Free inodes:              152729
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      319
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Tue Aug 12 19:22:53 2008
Last mount time:          Sun Jan 18 01:59:11 2009
Last write time:          Sun Jan 18 01:59:27 2009
Mount count:              2
Maximum mount count:      32
Last checked:             Sat Jan 17 19:33:26 2009
Check interval:           15552000 (6 months)
Next check after:         Thu Jul 16 20:33:26 2009
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Default directory hash:   tea
Directory Hash Seed:      ba7cdd48-9bce-4d4c-afdc-cff8b4008f11

Bye, Jörg.
-- 
Objektivität ist die Wahnvorstellung, Beobachtungen könnten ohne
Beobachter gemacht werden – Heinz v. Foerster

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