User:Massimo B./Btrfs-repairing-01

btrfs on LUKS on a NVMe disk inside USB enclosure. This btrfs contains all different snapshots from different machines, via btrbk and a lot of bees deduplication. Now it's damaged due to memory corruption on any of the working machines, or weak USB links... Chances are that only free space tree is corrupted and mounting ro could still restore all data.

Kernel: 6.12.16-gentoo-dist

root #btrfs check /dev/mapper/mobiledata_crypt

Opening filesystem to check...
Checking filesystem on /dev/mapper/mobiledata_crypt
UUID: 8fefabb7-11a7-4e12-8ee6-dc8f1529f8e5
[1/8] checking log skipped (none written)
[2/8] checking root items
[3/8] checking extents
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
checksum verify failed on 2564600332288 wanted 0xc04b5087 found 0xc3757de0
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
bad tree block 2564600332288, bytenr mismatch, want=2564600332288, have=4363494421962462810
owner ref check failed [2564600332288 16384]
ERROR: errors found in extent allocation tree or chunk allocation
[4/8] checking free space tree
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
checksum verify failed on 2564600332288 wanted 0xc04b5087 found 0xc3757de0
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
bad tree block 2564600332288, bytenr mismatch, want=2564600332288, have=4363494421962462810
could not load free space tree: Input/output error
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
checksum verify failed on 2564600332288 wanted 0xc04b5087 found 0xc3757de0
checksum verify failed on 2564600332288 wanted 0x98e25cd6 found 0xbab4624d
bad tree block 2564600332288, bytenr mismatch, want=2564600332288, have=4363494421962462810
could not load free space tree: Input/output error
[5/8] checking fs roots
[6/8] checking only csums items (without verifying data)
[7/8] checking root refs
[8/8] checking quota groups skipped (not enabled on this FS)
found 1978635726935 bytes used, error(s) found
total csum bytes: 1785865480
total tree bytes: 157852188672
total fs tree bytes: 136425439232
total extent tree bytes: 19102629888
btree space waste bytes: 29931988767
file data blocks allocated: 96097451388928
 referenced 29948246061056

This rescue mode would be preferred for not ignoring csums:

root #mount -v -o ro,rescue=nologreplay,rescue=ignorebadroots,rescue=ignoresuperflags,subvol=/ /dev/mapper/mobiledata_crypt /mnt/usb/mobiledata/

Going on restoring data to a new btrfs: User:Massimo_B./NewBtrbkDevice