linux-ext4 - Ext4 external journal UUID mismatch?

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Message-ID: <20120715234058.GA2562@tuon.disenchant.local>
Date:	Mon, 16 Jul 2012 09:10:58 +0930
From:	Kevin Shanahan <kmshanah@...enchant.net>
To:	linux-ext4@...r.kernel.org
Subject: Ext4 external journal UUID mismatch?

Hi,

I have created some filesystems with external journals, and after
reboot (clean shutdown) these will not mount anymore. I see in dmesg:

  [42214.365496] EXT4-fs (dm-10): journal UUID does not match

However, the UUIDs look fine when viewed with dumpe2fs:

# dumpe2fs -h /dev/it8/nfs-kvmhost0
Filesystem volume name:   <none>
Last mounted on:          /srv/nfs4/kvmhost0-rootfs
Filesystem UUID:          8a543c99-8a66-4ec2-9664-e82e3642cee0
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    journal_data user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              983040
Block count:              3932160
Reserved block count:     196608
Free blocks:              3628551
Free inodes:              939811
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      959
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
RAID stride:              128
RAID stripe width:        768
Flex block group size:    16
Filesystem created:       Sun Jul  8 10:45:26 2012
Last mount time:          Sun Jul  8 10:45:26 2012
Last write time:          Sun Jul 15 20:47:20 2012
Mount count:              1
Maximum mount count:      -1
Last checked:             Sun Jul  8 10:45:26 2012
Check interval:           0 (<none>)
Lifetime writes:          2024 MB
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 UUID:             9e21ab2e-533e-41b1-a006-21bcf7574a45
Journal device:	          0xfd0c
Default directory hash:   half_md4
Directory Hash Seed:      61c03a7c-947b-4432-a134-7b0dfd307228

# dumpe2fs -h /dev/ssdvg/jnl-kvmhost0
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          9e21ab2e-533e-41b1-a006-21bcf7574a45
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      journal_dev
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              0
Block count:              262144
Reserved block count:     0
Free blocks:              0
Free inodes:              0
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         0
Inode blocks per group:   0
Filesystem created:       Sun Jul  8 10:45:20 2012
Last mount time:          n/a
Last write time:          Sun Jul  8 10:45:21 2012
Mount count:              0
Maximum mount count:      -1
Last checked:             Sun Jul  8 10:45:20 2012
Check interval:           0 (<none>)
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:   half_md4
Directory Hash Seed:      9f3616f0-a8e2-4e61-8e31-2632a0fb2287

Journal block size:       4096
Journal length:           262144
Journal first block:      2
Journal sequence:         0x000120d6
Journal start:            0
Journal number of users:  1
Journal users:            8a543c99-8a66-4ec2-9664-e82e3642cee0

I don't understand why mount/kernel unhappy with this. Can someone
shed some light on this?

# uname -r
3.4.4-3-ARCH

Thanks,
Kevin.
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