>Why not btrfs check? 'btrfs check' also reported a checksum error. >As already suggested, you might do better looking elsewhere for help. >Perhaps the linux-btrfs mailing list?
Thank you for your suggestion, I am preparing to seek help from linux-btrfs mailing list. On August 20, 2023 12:54:01 PM UTC, debian-u...@howorth.org.uk wrote: >"Longhao.Chen" <longhao.c...@outlook.com> wrote: >> Hello everyone, I use Btrfs as the file system on my laptop. >> Yesterday, I was preparing to backup a snapshot to an external hard >> drive using btrfs send, and the following error occurred: >> >> ERROR: send ioctl failed with -5: Input/Output error > >I use btrfs but don't know much about it :( I certainly know nothing >about btrfs send, but the error seems to suggest perhaps an error with >the send rather than with reading the source? > >> I used btrfs scrub to scan the disk, and the result was: > >Why not btrfs check? > >> Error summary: csum=1 >> >> Corrected: 0 >> >> Uncorrectable: 1 >> >> Unverified: 0 > >OK so that sounds like a hardware problem. > >> Afterwards, I booted a LiveCD and ran: >> >> btrfs check --init-csum-tree >> >> During the running process, many outputs similar to this appeared: >> >> root 1380 inode 5006723 errors 2001, no inode item, link count wrong >> unresolved ref dir 1164151 index 1566 namelen 28 name <filename> >> filetype 1 errors 4, no inode ref >> >> Then I found that the file in the above <filename> had disappeared. >> At this point, I immediately backed up all the existing files and >> then used: >> >> btrfs check --repair >> >> btrfs rescue >> >> in an attempt to recover the lost files, but was unsuccessful. >> >> The current issues are: >> >> How do I recover the lost files? > >From a backup? I think they're gone from the source. (But what do I >know) > >> Why does btrfs check --init-csum-tree cause file loss? Is this a bug? > >Seems unlikely. Why do you think the command causes the file loss? Why >do you not think the corruption was already there? And did you read the >DANGEROUS description in the docs? > >> LiveCD information: >> >> Linux ubuntu 6.2.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC >> Thu Jul 13 16:27:29 UTC 2 x86_64 x86_64 x86_64 GNU/Linux >> >> Thank you for your help. > >As already suggested, you might do better looking elsewhere for help. >Perhaps the linux-btrfs mailing list? >
