Qu Wenruo <quwenruo.btrfs@xxxxxxx> writes:
> On 2018年03月13日 21:01, Dirk Gouders wrote:
>> Qu Wenruo <quwenruo.btrfs@xxxxxxx> writes:
>>
>>> On 2018年03月13日 16:53, Dirk Gouders wrote:
>>
>> <SNIP>
>>
>>>> find-root:
>>>>
>>>> # btrfs-find-root /dev/loop0p1
>>>> Superblock thinks the generation is 9858294
>>>> Superblock thinks the level is 1
>>>> Found tree root at 848773120 gen 9858294 level 1
>>>
>>> Tree root is found, find-root won't help much here.
>>> And if it's really tree root corruption, we should have some kernel
>>> message for it.
>>>
>>>> Well block 832045056(gen: 9858272 level: 1) seems good, but generation/level doesn't match, want gen: 9858294 level: 1
>>>
>>> Especially when the next tree block is 22 generation older.
>>>
>>> Would you please try to call "btrfs inspect dump-tree <device>" and
>>> paste the result with *stderr*?
>>>
>>> At least we could know which tree block is corrupted.
>>
>> Here is the result of inspect:
>>
>> # btrfs inspect dump-tree /dev/loop0p1
>> btrfs-progs v4.15
>> checksum verify failed on 363069440 found 296FB15A wanted F0AFE59D
>> checksum verify failed on 363069440 found 296FB15A wanted F0AFE59D
>> checksum verify failed on 363069440 found DC09290B wanted C630FD61
>> checksum verify failed on 363069440 found 296FB15A wanted F0AFE59D
>> bytenr mismatch, want=363069440, have=17552567724568668829
>> ERROR: unable to open /dev/loop0p1
>
> OK, one tree block in some important tree is corrupted.
>
> Would you please dump the super block by "btrfs inspect dump-super
> <device>" so that we could have some clue about where the corrupted tree
> block belongs?
Yes, here is the requested output:
# btrfs inspect dump-super /dev/loop0p1
superblock: bytenr=65536, device=/dev/loop0p1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x31998c61 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid a6459a90-ebe3-4c75-97f4-5496eadcc96f
label
generation 9858294
root 848773120
sys_array_size 226
chunk_root_generation 18814
root_level 1
chunk_root 20971520
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 10741612544
bytes_used 9141452800
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x61
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF )
cache_generation 9858294
uuid_tree_generation 9824396
dev_item.uuid b92bd216-a0bb-467d-8f8f-788f845af30c
dev_item.fsid a6459a90-ebe3-4c75-97f4-5496eadcc96f [match]
dev_item.type 0
dev_item.total_bytes 10741612544
dev_item.bytes_used 10741612544
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
Thanks,
Dirk
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