Hi there,
I have an unmountable volume. Is it possible to recover my data? Can someone advise on how to proceed?
# btrfs check --repair Pool-1.img.broken
enabling repair mode
checksum verify failed on 90201440256 found E4E3BDB6 wanted 00000000
checksum verify failed on 90201440256 found E4E3BDB6 wanted 00000000
checksum verify failed on 90201440256 found E4E3BDB6 wanted 00000000
checksum verify failed on 90201440256 found E4E3BDB6 wanted 00000000
bytenr mismatch, want=90201440256, have=0
ERROR: cannot open file system
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================================================================
# btrfs inspect-internal dump-super -Ffa /var/snap/lxd/common/lxd/disks/Pool-1.img.broken
superblock: bytenr=65536, device=/var/snap/lxd/common/lxd/disks/Pool-1.img.broken
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x009450b6 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid ce7401fb-f189-4341-8464-e69dfe5ad268
label
generation 1537924
root 710590464
sys_array_size 129
chunk_root_generation 255534
root_level 1
chunk_root 22020096
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 132212252672
bytes_used 127395315712
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x161
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
cache_generation 1537924
uuid_tree_generation 1537924
dev_item.uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
dev_item.fsid ce7401fb-f189-4341-8464-e69dfe5ad268 [match]
dev_item.type 0
dev_item.total_bytes 132212252672
dev_item.bytes_used 132211146752
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
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096)
length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 0
stripe 0 devid 1 offset 22020096
dev_uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
stripe 1 devid 1 offset 30408704
dev_uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
backup_roots[4]:
backup 0:
backup_tree_root: 710410240 gen: 1537922 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 709427200 gen: 1537922 level: 2
backup_fs_root: 711000064 gen: 1537922 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 709754880 gen: 1537922 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127397171200
backup_num_devices: 1
backup 1:
backup_tree_root: 713179136 gen: 1537923 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 709066752 gen: 1537923 level: 2
backup_fs_root: 708689920 gen: 1537923 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 708952064 gen: 1537923 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127395315712
backup_num_devices: 1
backup 2:
backup_tree_root: 710590464 gen: 1537924 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 710606848 gen: 1537924 level: 2
backup_fs_root: 708689920 gen: 1537923 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 710868992 gen: 1537924 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127395315712
backup_num_devices: 1
backup 3:
backup_tree_root: 708706304 gen: 1537921 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 708198400 gen: 1537921 level: 2
backup_fs_root: 707084288 gen: 1537921 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 708116480 gen: 1537921 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127396753408
backup_num_devices: 1
superblock: bytenr=67108864, device=/var/snap/lxd/common/lxd/disks/Pool-1.img.broken
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0xa0f57878 [match]
bytenr 67108864
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid ce7401fb-f189-4341-8464-e69dfe5ad268
label
generation 1537924
root 710590464
sys_array_size 129
chunk_root_generation 255534
root_level 1
chunk_root 22020096
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 132212252672
bytes_used 127395315712
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x161
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
cache_generation 1537924
uuid_tree_generation 1537924
dev_item.uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
dev_item.fsid ce7401fb-f189-4341-8464-e69dfe5ad268 [match]
dev_item.type 0
dev_item.total_bytes 132212252672
dev_item.bytes_used 132211146752
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
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096)
length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 0
stripe 0 devid 1 offset 22020096
dev_uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
stripe 1 devid 1 offset 30408704
dev_uuid 809ccac5-d38c-4294-819a-f21f1cc8fdd5
backup_roots[4]:
backup 0:
backup_tree_root: 710410240 gen: 1537922 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 709427200 gen: 1537922 level: 2
backup_fs_root: 711000064 gen: 1537922 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 709754880 gen: 1537922 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127397171200
backup_num_devices: 1
backup 1:
backup_tree_root: 713179136 gen: 1537923 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 709066752 gen: 1537923 level: 2
backup_fs_root: 708689920 gen: 1537923 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 708952064 gen: 1537923 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127395315712
backup_num_devices: 1
backup 2:
backup_tree_root: 710590464 gen: 1537924 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 710606848 gen: 1537924 level: 2
backup_fs_root: 708689920 gen: 1537923 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 710868992 gen: 1537924 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127395315712
backup_num_devices: 1
backup 3:
backup_tree_root: 708706304 gen: 1537921 level: 1
backup_chunk_root: 22020096 gen: 255534 level: 0
backup_extent_root: 708198400 gen: 1537921 level: 2
backup_fs_root: 707084288 gen: 1537921 level: 2
backup_dev_root: 1012645888 gen: 255534 level: 0
backup_csum_root: 708116480 gen: 1537921 level: 2
backup_total_bytes: 132212252672
backup_bytes_used: 127396753408
backup_num_devices: 1
# btrfs-find-root Pool-1.img.broken
Superblock thinks the generation is 1537924
Superblock thinks the level is 1
Found tree root at 710590464 gen 1537924 level 1
Well block 710410240(gen: 1537922 level: 1) seems good, but generation/level doesn't match, want gen: 1537924 level: 1
Well block 705495040(gen: 1537920 level: 1) seems good, but generation/level doesn't match, want gen: 1537924 level: 1
Well block 683982848(gen: 1537919 level: 1) seems good, but generation/level doesn't match, want gen: 1537924 level: 1
...... (clipped for space - all other lines are similar - i.e. Well block n seems good but generation/level doesn't match)
Lai
