[Ocfs2-devel] mount failed as system file //journal:0004 damaged

[Shichangkuo]

Hi, all
    I can't mount a disk with slotnum=4, other slots could mount successfully. Err msg is:
       root at cvk41:~# mount /dev/sdi /vms/gqg-1T -o preferred_slot=4
       mount.ocfs2: Invalid argument while mounting /dev/sdi on /vms/gqg-1T. Check 'dmesg' for more information on this error.

Dec 16 11:25:42 cvknode kernel: [ 5409.023779] o2dlm: Joining domain 9B244483B1C04B76A1AAEB3A5D09847B ( 1 2 4 5 6 ) 5 nodes
Dec 16 11:25:42 cvknode kernel: [ 5409.041933] JBD2: no valid journal superblock found
Dec 16 11:25:42 cvknode kernel: [ 5409.041939] (mount.ocfs2,23379,11):ocfs2_journal_wipe:1113 ERROR: status = -22
Dec 16 11:25:42 cvknode kernel: [ 5409.041971] (mount.ocfs2,23379,11):ocfs2_check_volume:2449 ERROR: status = -22
Dec 16 11:25:42 cvknode kernel: [ 5409.041974] (mount.ocfs2,23379,11):ocfs2_check_volume:2510 ERROR: status = -22
Dec 16 11:25:42 cvknode kernel: [ 5409.041978] (mount.ocfs2,23379,11):ocfs2_mount_volume:1889 ERROR: status = -22
Dec 16 11:25:42 cvknode kernel: [ 5409.043947] o2dlm: Node 3 joins domain 9B244483B1C04B76A1AAEB3A5D09847B ( 1 2 3 4 5 6 ) 6 nodes
Dec 16 11:25:46 cvknode kernel: [ 5413.076279] o2dlm: Leaving domain 9B244483B1C04B76A1AAEB3A5D09847B
Dec 16 11:25:46 cvknode kernel: [ 5413.076732] ocfs2: Unmounting device (8,128) on (node 2)

I dumped //journal:0004 with hexdump, and found the fist block (4KB) maybe changed.
//journal:0000
root at cvk41:~# hexdump -C -n 1024 -s 0x600000 /dev/dm-4
00600000 c0 3b 39 98 00 00 00 04 00 00 00 00 00 00 10 00 |.;9.............|
00600010 00 00 80 00 00 00 00 01 00 06 2d ef 00 00 00 07 |..........-.....|
00600020 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 00 |................|
00600030 9b 24 44 83 b1 c0 4b 76 a1 aa eb 3a 5d 09 84 7b |.$D...Kv...:]..{|
00600040 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00600050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00600400

//journal:0004
root at cvk41:~# hexdump -C -n 1024 -s 0x20600000 /dev/dm-4
20600000 c0 3b 39 98 00 00 00 02 00 00 e0 d3 00 00 00 00 |.;9.............|
20600010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
20600030 00 00 00 00 56 0b 0f d7 01 e5 84 c2 00 00 00 00 |....V...........|
20600040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
20600400

In first block, the journal type is 02(JBD2_COMMIT_BLOCK) other than 04(JBD2_SUPERBLOCK_V2).
This disk has been idled for a long time, but I think the first block was written by formatting, and none operations could change it.
So I can't understand which operations could cause to my issue.
The attachment is a file which is dumped by " logdump slot4".

Thanks a lot!!

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