On 2019/10/19 上午1:18, 小太 wrote: > Hi, I recently got the following error in dmesg while taking an > incremental backup of my data: > > [26876.491167] BTRFS critical (device dm-0): corrupt leaf: root=258 > block=739531833344 slot=0 ino=19366566, invalid mode: has 00 expect > valid S_IF* bit(s)
Tree-checker detects an invalid inode mode bit. From previous report, it should be caused by older kernel around 2014. > [26876.491171] BTRFS error (device dm-0): block=739531833344 read time > tree block corruption detected > > It is triggered whenever stat() is called on one of these files: > $ ls -lR >/dev/null > ls: cannot access './<redacted a>/2018-05-31.220504+1000AEST.html': > Input/output error > ls: cannot access './<redacted b>/2018-05-31.200836+1000AEST.html': > Input/output error > ls: cannot access './<redacted c>/2018-05-31.201834+1000AEST.html': > Input/output error > ls: cannot access './<redacted d>/2018-05-31.222947+1000AEST.html': > Input/output error > > https://btrfs.wiki.kernel.org/index.php/Tree-checker#How_to_handle_such_error > tells me to post on this mailing list upon getting such an error, so > here I am. > > What's happened? Your 2014 kernel created some bad inodes. > How can I fix this? There are two solutions: - Remove the offending inodes using older kernel The problem is, you need to find *all* offending inodes. Tree-checker can only report the first one it hits, can't report all. The offending inodes is reported by the "ino=%llu" part of the kernel message. - Use out-of-tree btrfs-check. The report and repair functionality hasn't been merged yet, but you can still try them using this branch: https://github.com/adam900710/btrfs-progs/tree/for_next You can fix it using "./btrfs check --repair" but you need to compile the branch. Thanks, Qu > Should I just restore from backup? > > Various diagnostic command outputs: > > $ uname -a > Linux home.kota.moe 5.2.0-3-rt-amd64 #1 SMP PREEMPT RT Debian 5.2.17-1 > (2019-09-26) x86_64 GNU/Linux > $ btrfs --version > btrfs-progs v5.2.1 > $ sudo btrfs filesystem show > Label: none uuid: 909c3fad-bc84-4b62-8090-ad1ae46f925e > Total devices 2 FS bytes used 191.27GiB > devid 1 size 200.00GiB used 197.03GiB path /dev/mapper/home-dom0 > devid 2 size 200.00GiB used 197.03GiB path /dev/mapper/home-dom0--mirror > $ sudo btrfs filesystem df . > Data, RAID1: total=193.00GiB, used=188.50GiB > System, RAID1: total=32.00MiB, used=48.00KiB > Metadata, RAID1: total=4.00GiB, used=2.77GiB > GlobalReserve, single: total=385.31MiB, used=0.00B > $ diff -u <(sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0) > <(sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0-mirror) > $ sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0 > (See attached file) >
signature.asc
Description: OpenPGP digital signature
