[Ocfs2-devel] the first two block become corrupt in ocfs2.

[Zhangguanghui]

Hi
In OCFS2, the super block is on the third block.
But I find that the first two block become corrupt in the race window
while storage link down.
I don't know what is reason for triggering the problem.
c0 3b 39 98 is JFS_MAGIC_NUMBER,overwrites inode signature.
45 30 31 00 is generation number on disk inode for OCFS2
(ocfs2_dinode) ,

Thanks for your reply. Regards


details:

root at hxn-server24:~# hexdump -C /dev/dm-7 | more
00000000 c0 3b 39 98 45 30 31 00 9c c3 67 76 06 00 09 00 |.;9.E01...gv....|
00000010 00 00 00 00 ed 00 00 00 00 00 00 00 00 00 00 00 |................|
00000020 00 00 d0 0e 00 00 00 00 80 81 01 00 01 00 00 00 |................|
00000030 76 4f 4e 57 00 00 00 00 29 4e 4e 57 00 00 00 00 |vONW....)NNW....|
00000040 29 4e 4e 57 00 00 00 00 00 00 00 00 00 00 00 00 |)NNW............|
00000050 09 01 7a 01 00 00 00 00 00 00 00 00 00 00 00 00 |..z.............|
00000060 9a 3d 0b c8 12 ab d6 28 fd c1 a9 32 fd c1 a9 32 |.=.....(...2...2|
00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000c0 00 00 f3 00 2b 00 00 00 00 00 00 00 00 00 00 00 |....+...........|
000000d0 00 00 00 00 08 00 00 00 00 71 85 0d 00 00 00 00 |.........q......|
000000e0 08 00 00 00 02 00 00 00 00 7a 85 0d 00 00 00 00 |.........z......|
000000f0 0a 00 00 00 01 00 00 00 00 79 85 0d 00 00 00 00 |.........y......|
00000100 0b 00 00 00 05 00 00 00 00 7c 85 0d 00 00 00 00 |.........|......|
00000110 10 00 00 00 09 00 00 00 00 b1 86 0d 00 00 00 00 |................|
00000120 19 00 00 00 01 00 00 00 00 bd 86 0d 00 00 00 00 |................|
00000130 1a 00 00 00 03 00 00 00 00 ba 86 0d 00 00 00 00 |................|
00000140 1d 00 00 00 03 00 00 00 00 be 86 0d 00 00 00 00 |................|
00000150 20 00 00 00 07 00 00 00 00 51 87 0d 00 00 00 00 | ........Q......|
00000160 27 00 00 00 01 00 00 00 00 59 87 0d 00 00 00 00 |'........Y......|
00000170 28 00 00 00 01 00 00 00 00 58 87 0d 00 00 00 00 |(........X......|
00000180 29 00 00 00 07 00 00 00 00 5a 87 0d 00 00 00 00 |)........Z......|
00000190 30 00 00 00 20 00 00 00 00 01 88 0d 00 00 00 00 |0... ...........|
000001a0 50 00 00 00 10 00 00 00 00 61 89 0d 00 00 00 00 |P........a......|
000001b0 60 00 00 00 03 00 00 00 00 0e 85 0d 00 00 00 00 |`...............|
000001c0 63 00 00 00 07 00 00 00 00 8a 85 0d 00 00 00 00 |c...............|
000001d0 6a 00 00 00 07 00 00 00 00 ca 85 0d 00 00 00 00 |j...............|
000001e0 71 00 00 00 07 00 00 00 00 4a 86 0d 00 00 00 00 |q........J......|
000001f0 78 00 00 00 01 00 00 00 00 8c 86 0d 00 00 00 00 |x...............|
00000200 79 00 00 00 01 00 00 00 00 8e 86 0d 00 00 00 00 |y...............|
00000210 7a 00 00 00 01 00 00 00 00 69 86 0d 00 00 00 00 |z........i......|
00000220 7b 00 00 00 10 00 00 00 00 7a 4e 0d 00 00 00 00 |{........zN.....|
00000230 8b 00 00 00 10 00 00 00 00 aa 4e 0d 00 00 00 00 |..........N.....|
00000240 9b 00 00 00 10 00 00 00 00 01 4b 0d 00 00 00 00 |..........K.....|
00000250 ab 00 00 00 10 00 00 00 00 c1 4b 0d 00 00 00 00 |..........K.....|
00000260 bb 00 00 00 03 00 00 00 00 61 4c 0d 00 00 00 00 |.........aL.....|
00000270 be 00 00 00 02 00 00 00 00 15 f5 02 00 00 00 00 |................|
00000280 c0 00 00 00 01 00 00 00 00 12 d4 0a 00 00 00 00 |................|
00000290 c1 00 00 00 01 00 00 00 00 11 f4 0a 00 00 00 00 |................|
000002a0 c2 00 00 00 07 00 00 00 00 62 d0 0b 00 00 00 00 |.........b......|
000002b0 c9 00 00 00 06 00 00 00 00 22 56 0a 00 00 00 00 |........."V.....|
000002c0 cf 00 00 00 01 00 00 00 00 43 76 02 00 00 00 00 |.........Cv.....|
000002d0 d0 00 00 00 04 00 00 00 00 54 e0 07 00 00 00 00 |.........T......|
000002e0 d4 00 00 00 01 00 00 00 00 b8 f8 01 00 00 00 00 |................|
000002f0 d5 00 00 00 01 00 00 00 00 ba f8 01 00 00 00 00 |................|
00000300 d6 00 00 00 07 00 00 00 00 01 dd 08 00 00 00 00 |................|
00000310 dd 00 00 00 01 00 00 00 00 89 4e 0c 00 00 00 00 |..........N.....|
00000320 de 00 00 00 01 00 00 00 00 4f 46 0e 00 00 00 00 |.........OF.....|
00000330 df 00 00 00 01 00 00 00 00 8d 62 07 00 00 00 00 |..........b.....|
00000340 e0 00 00 00 01 00 00 00 00 cd 4e 0c 00 00 00 00 |..........N.....|
00000350 e1 00 00 00 01 00 00 00 00 d3 e8 05 00 00 00 00 |................|
00000360 e2 00 00 00 0a 00 00 00 00 74 46 0e 00 00 00 00 |.........tF.....|
00000370 ec 00 00 00 01 00 00 00 00 25 e9 05 00 00 00 00 |.........%......|
00000380 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00001000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 |................|
*
00002000 4f 43 46 53 56 32 00 00 9a 3d 0b c8 ff ff ff ff |OCFSV2...=......|
00002010 00 00 00 00 00 a0 0f 00 00 00 00 00 00 00 00 00 |................|
00002020 00 00 00 00 00 00 00 00 00 00 00 00 31 00 00 00 |............1...|
00002030 00 00 00 00 00 00 00 00 f9 c6 42 57 00 00 00 00 |..........BW....|
00002040 f9 c6 42 57 00 00 00 00 00 00 00 00 00 00 00 00 |..BW............|
00002050 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00002060 9a 3d 0b c8 00 00 00 00 00 00 00 00 00 00 00 00 |.=..............|
00002070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

________________________________
zhangguanghui
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