At Thu, 19 Oct 2017 12:03:08 +0900, satoru takeuchi wrote: > > Resend it since I forgot to CC linux-btrfs ML >Larkin > > On Oct 17, 2017, at 0:16, Larkin Lowrey <llow...@nuclearwinter.com> > wrote: > > I am unable to mount one my my filesystems. The superblock thinks > the latest generation is 2220927 but I can't seem to find a root > with that number. I can find 2220926 and 2220928 but not 2220927. > Is there anything that I can do to recover this FS? > > > `btrfs-select-super` may help you. Please see the following steps. > > 1. Backup the current unmountable fs image if possible. > 2. Salvage your files as much as possilbe with reading the following > document > if possible. > > https://btrfs.wiki.kernel.org/index.php/Restore > > 3. Execute `btrfs-select-super -s 1 /dev/Cached/Backups`. Please note > that > this command changes the contents of /dev/Cached/Backups. So if this > command fails. Things would get worse.
I forgot to tell one important point. You can only run above mentioned command iff 1st copy of superblock is valid. It can be confirmed by `btrfs inspect-internal dump-super (or btrfs-dump-super)` as follows. * valid case ``` $ sudo btrfs inspect dump-super -a /dev/sdb4 ... superblock: bytenr=67108864, device=/dev/sdb4 # 1st copy of superblock --------------------------------------------------------- csum 0x423bcd19 [match] bytenr 67108864 flags 0x1 ... ``` * invalid case ``` $ sudo btrfs inspect dump-super -a /dev/sdb4 ... superblock: bytenr=67108864, device=/dev/sdb4 --------------------------------------------------------- ERROR: bad magic on superblock on /dev/sdb4 at 67108864 ... ``` Thanks, Satoru > Thanks, > Satoru > > > # btrfs check /dev/Cached/Backups > checksum verify failed on 159057884594176 found 15284E33 wanted > C8C5B54E > checksum verify failed on 159057884594176 found 15284E33 wanted > C8C5B54E > checksum verify failed on 159057884594176 found 472037C9 wanted > 9ACDCCB4 > checksum verify failed on 159057884594176 found 472037C9 wanted > 9ACDCCB4 > Csum didn't match > Couldn't setup extent tree > Couldn't open file system > > # btrfs-find-root -g 2220927 /dev/Cached/Backups > Couldn't setup extent tree > Couldn't setup device tree > Superblock thinks the generation is 2220927 > Superblock thinks the level is 2 > > Found tree root at 159057884577792 gen 2220927 level 2 > Well block 101489031790592(gen: 2220928 level: 2) seems good, but > generation/level doesn't match, want gen: 2220927 level: 2 > > # btrfs check --tree-root 159057884577792 /dev/Cached/Backups > checksum verify failed on 159057884594176 found 15284E33 wanted > C8C5B54E > checksum verify failed on 159057884594176 found 15284E33 wanted > C8C5B54E > checksum verify failed on 159057884594176 found 472037C9 wanted > 9ACDCCB4 > checksum verify failed on 159057884594176 found 472037C9 wanted > 9ACDCCB4 > Csum didn't match > Couldn't setup extent tree > Couldn't open file system > > # btrfs check --tree-root 101489031790592 /dev/Cached/Backups > parent transid verify failed on 101489031790592 wanted 2220927 > found 2220928 > parent transid verify failed on 101489031790592 wanted 2220927 > found 2220928 > parent transid verify failed on 101489031790592 wanted 2220927 > found 2220928 > parent transid verify failed on 101489031790592 wanted 2220927 > found 2220928 > Ignoring transid failure > parent transid verify failed on 159057595138048 wanted 2220927 > found 2220920 > parent transid verify failed on 159057595138048 wanted 2220927 > found 2220920 > parent transid verify failed on 159057595138048 wanted 2220927 > found 2220920 > parent transid verify failed on 159057595138048 wanted 2220927 > found 2220920 > Ignoring transid failure > parent transid verify failed on 158652658122752 wanted 2220927 > found 2220911 > parent transid verify failed on 158652658122752 wanted 2220927 > found 2220911 > parent transid verify failed on 158652658122752 wanted 2220927 > found 2220911 > parent transid verify failed on 158652658122752 wanted 2220927 > found 2220911 > Ignoring transid failure > Checking filesystem on /dev/Cached/Backups > UUID: 1b213dfd-6486-47d8-8459-bc5825882023 > checking extents > parent transid verify failed on 116329711550464 wanted 2220928 > found 2220921 > parent transid verify failed on 116329711550464 wanted 2220928 > found 2220921 > parent transid verify failed on 116329711550464 wanted 2220928 > found 2220921 > parent transid verify failed on 116329711550464 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116325928206336 wanted 2220928 > found 2220921 > parent transid verify failed on 116325928206336 wanted 2220928 > found 2220921 > parent transid verify failed on 116325928206336 wanted 2220928 > found 2220921 > parent transid verify failed on 116325928206336 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116329892970496 wanted 2220928 > found 2220921 > parent transid verify failed on 116329892970496 wanted 2220928 > found 2220921 > parent transid verify failed on 116329892970496 wanted 2220928 > found 2220921 > parent transid verify failed on 116329892970496 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116325929943040 wanted 2220928 > found 2220921 > parent transid verify failed on 116325929943040 wanted 2220928 > found 2220921 > parent transid verify failed on 116325929943040 wanted 2220928 > found 2220921 > parent transid verify failed on 116325929943040 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116325932679168 wanted 2220928 > found 2220921 > parent transid verify failed on 116325932679168 wanted 2220928 > found 2220921 > parent transid verify failed on 116325932679168 wanted 2220928 > found 2220921 > parent transid verify failed on 116325932679168 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116010673373184 wanted 2220928 > found 2220921 > parent transid verify failed on 116010673373184 wanted 2220928 > found 2220921 > parent transid verify failed on 116010673373184 wanted 2220928 > found 2220921 > parent transid verify failed on 116010673373184 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116329479405568 wanted 2220928 > found 2220921 > parent transid verify failed on 116329479405568 wanted 2220928 > found 2220921 > parent transid verify failed on 116329479405568 wanted 2220928 > found 2220921 > parent transid verify failed on 116329479405568 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 116480660914176 wanted 2220928 > found 2220921 > parent transid verify failed on 116480660914176 wanted 2220928 > found 2220921 > parent transid verify failed on 116480660914176 wanted 2220928 > found 2220921 > parent transid verify failed on 116480660914176 wanted 2220928 > found 2220921 > Ignoring transid failure > checksum verify failed on 159058014814208 found 406AAC5F wanted > C07B44A6 > checksum verify failed on 159058014814208 found 406AAC5F wanted > C07B44A6 > parent transid verify failed on 159058014814208 wanted 2220927 > found 2220920 > checksum verify failed on 159058014814208 found 406AAC5F wanted > C07B44A6 > Csum didn't match > parent transid verify failed on 116329821028352 wanted 2220928 > found 2220921 > parent transid verify failed on 116329821028352 wanted 2220928 > found 2220921 > parent transid verify failed on 116329821028352 wanted 2220928 > found 2220921 > parent transid verify failed on 116329821028352 wanted 2220928 > found 2220921 > Ignoring transid failure > parent transid verify failed on 114958975139840 wanted 2220928 > found 2220920 > parent transid verify failed on 114958975139840 wanted 2220928 > found 2220920 > parent transid verify failed on 114958975139840 wanted 2220928 > found 2220920 > parent transid verify failed on 114958975139840 wanted 2220928 > found 2220920 > Ignoring transid failure > leaf parent key incorrect 114958975139840 > bad block 114958975139840 > Errors found in extent allocation tree or chunk allocation > parent transid verify failed on 116329711550464 wanted 2220928 > found 2220921 > Ignoring transid failure > leaf parent key incorrect 116329711550464 > > > -- > To unsubscribe from this list: send the line "unsubscribe > linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
