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Date:	Mon, 3 Nov 2008 14:09:34 +0000
From:	"Roc Valles" <>
Subject: Re: data corruption with ext4 (from exposed by rtorrent

Ok. It's a recently made ext4 using mkfs.ext4dev from latest
sysresccd. Inmediatly after making it, I moved in my root from an old
500GB ext3 hard disk.

This is the output:

kaguya ~ # dumpe2fs -h /dev/sda3
dumpe2fs 1.41.3 (12-Oct-2008)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          07520665-bfed-4d37-a38e-0a7cb04cff59
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index
filetype needs_recovery extent flex_bg sparse_super large_file
huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash test_filesystem
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              91430912
Block count:              365693619
Reserved block count:     0
Free blocks:              245016006
Free inodes:              90916075
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      936
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Fri Oct 31 13:43:31 2008
Last mount time:          Mon Nov  3 11:17:20 2008
Last write time:          Mon Nov  3 11:17:20 2008
Mount count:              5
Maximum mount count:      31
Last checked:             Fri Oct 31 13:43:31 2008
Check interval:           15552000 (6 months)
Next check after:         Wed Apr 29 13:43:31 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
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      ba0cc33f-c339-4fd9-aa04-bfdad45ecf92
Journal backup:           inode blocks
Journal size:             128M

On Mon, Nov 3, 2008 at 13:40, Theodore Tso <> wrote:
> Can both of you send the output of "dumpe2fs -h /dev/<disk device>" of
> the filesystem in question?  The thing which I'm most interested in is
> whether the extents feature was enabled or not.  (i.e., was this a
> freshly made ext4 filesystem, or a ext3 filesystem mounted under ext4,
> and with which features eanbled?)
> Thanks,
>                                                - Ted
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