Re: [help me] corrupted filesystem, restoration methods exhausted.

[Mark Harmstone <mark@harmstone.com>]

Have you done an extended SMART test on your disk? The most likely root cause is
that your disk is goosed.

On 16/07/2025 7.36 pm, PranshuTheGamer wrote:
> Hello.
> I was here 2 weeks ago, and this time I have another btrfs system
> corrupted for the same reason, sudden power loss. I clearly didn't
> learn from my mistakes. I shall attach a few commands and their
> outputs.
> 
>> sudo mount -o ro,compress=zstd,noatime,barrier,flushoncommit,rescue=all /dev/disk/by-label/WD-01\\x20Storage /run/media/shivangi/WD-01
> mount: /run/media/shivangi/WD-01: can't read superblock on /dev/sdc1.
>         dmesg(1) may have more information after failed mount system call.
> 
>> sudo dmesg
> [ 8832.794775] BTRFS: device label WD-01 Storage devid 1 transid 9193
> /dev/sdc1 (8:33) scanned by mount (18864)
> [ 8832.795869] BTRFS info (device sdc1 state S): first mount of
> filesystem 57e6e11e-33c5-4348-a737-2efe07548dbc
> [ 8832.795897] BTRFS info (device sdc1 state S): using crc32c
> (crc32c-x86) checksum algorithm
> [ 8832.795907] BTRFS info (device sdc1 state S): using free-space-tree
> [ 8832.804406] BTRFS error (device sdc1 state S): parent transid
> verify failed on logical 732954411008 mirror 1 wanted 9193 found 9191
> [ 8832.805077] BTRFS error (device sdc1 state S): parent transid
> verify failed on logical 732954411008 mirror 2 wanted 9193 found 9191
> [ 8832.805095] BTRFS warning (device sdc1 state S): couldn't read tree root
> [ 8832.805841] BTRFS error (device sdc1 state S): open_ctree failed: -5
> 
>> sudo btrfs restore -l /dev/disk/by-label/WD-01\\x20Storage
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> Ignoring transid failure
>   tree key (EXTENT_TREE ROOT_ITEM 0) 732954443776 level 2
>   tree key (DEV_TREE ROOT_ITEM 0) 30834688 level 1
>   tree key (FS_TREE ROOT_ITEM 0) 732809641984 level 2
>   tree key (CSUM_TREE ROOT_ITEM 0) 732954558464 level 2
>   tree key (UUID_TREE ROOT_ITEM 0) 732809723904 level 0
>   tree key (FREE_SPACE_TREE ROOT_ITEM 0) 732954542080 level 1
>   tree key (258 ROOT_ITEM 0) 1074905481216 level 1
>   tree key (259 ROOT_ITEM 0) 1074905546752 level 1
>   tree key (260 ROOT_ITEM 0) 1075680133120 level 2
>   tree key (261 ROOT_ITEM 0) 1074912346112 level 1
>   tree key (265 ROOT_ITEM 304) 1075044286464 level 1
>   tree key (266 ROOT_ITEM 305) 1075057786880 level 2
>   tree key (267 ROOT_ITEM 306) 1075066519552 level 1
>   tree key (270 ROOT_ITEM 338) 1075071647744 level 1
>   tree key (271 ROOT_ITEM 339) 1075072745472 level 2
>   tree key (272 ROOT_ITEM 340) 1075087720448 level 1
>   tree key (275 ROOT_ITEM 516) 1075088801792 level 1
>   tree key (276 ROOT_ITEM 517) 1075091931136 level 2
>   tree key (277 ROOT_ITEM 518) 1075105366016 level 1
>   tree key (279 ROOT_ITEM 0) 733124001792 level 2
>   tree key (281 ROOT_ITEM 819) 733086138368 level 2
>   tree key (282 ROOT_ITEM 829) 37928960 level 2
>   tree key (289 ROOT_ITEM 879) 733147119616 level 2
>   tree key (291 ROOT_ITEM 970) 733220503552 level 1
>   tree key (292 ROOT_ITEM 971) 733221715968 level 2
>   tree key (293 ROOT_ITEM 972) 733222060032 level 1
>   tree key (295 ROOT_ITEM 976) 732351725568 level 2
>   tree key (303 ROOT_ITEM 2159) 1075506905088 level 2
>   tree key (304 ROOT_ITEM 2429) 733309599744 level 2
>   tree key (306 ROOT_ITEM 2432) 733311385600 level 2
>   tree key (308 ROOT_ITEM 2434) 733312335872 level 1
>   tree key (309 ROOT_ITEM 5300) 732955852800 level 2
>   tree key (310 ROOT_ITEM 5547) 1074997673984 level 2
>   tree key (311 ROOT_ITEM 5548) 1075586596864 level 2
>   tree key (312 ROOT_ITEM 5634) 32423936 level 2
>   tree key (313 ROOT_ITEM 5657) 32456704 level 2
>   tree key (314 ROOT_ITEM 5658) 35717120 level 2
>   tree key (317 ROOT_ITEM 6878) 732579905536 level 2
>   tree key (318 ROOT_ITEM 8931) 732809347072 level 2
>   tree key (DATA_RELOC_TREE ROOT_ITEM 0) 30523392 level 0
> 
> ^ These are a lot of snapshots btw
> 
> I ran `sudo btrfs inspect-internal dump-tree -b 1074905481216
> /dev/sdc1 > tree_258.txt` for each of these, then ran this script:
> for file in tree_*.txt; do
>    echo "\n========== $file =========="
>    echo "-- DIR_ITEM --"
>    grep -i 'DIR_ITEM' "$file" || echo "No DIR_ITEM found."
>    echo "-- INODE_ITEM --"
>    grep -i 'INODE_ITEM' "$file" || echo "No INODE_ITEM found."
> done | tee summary.txt,
> ^ which I have attached.
> 
> Then, in zsh i ran this script to list anything that can give me a
> name, because nothing is giving me any names to restore.
> 
> roots=(
>    258 259 260 261 265 266 267 270 271 272
>    275 276 277 279 281 282 289 291 292 293
>    295 303 304 306 308 309 310 311 312 313
>    314 317 318
> )
> 
> for root in $roots; do
>    echo "---- Trying root $root ----"
>    sudo btrfs restore --dry-run --verbose --root=$root
> /dev/disk/by-label/WD-01\ Storage /mnt/tmp 2>&1 | grep -E
> '^Restoring|^ignoring'
> done
> 
> The output was empty
> 
> Finally I ran:
> 
>> sudo btrfs restore --dry-run --verbose --i /dev/disk/by-label/WD-01\\x20Storage   /mnt/tmp | grep '^Restoring'
> 
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> parent transid verify failed on 732954411008 wanted 9193 found 9191
> Ignoring transid failure
> 
> So yeah I'm in deep stuff now. Please send help