Re: btrfs check Causes File Corruption
I'm sorry, because a long time after I sent the first email, I didn't see it in the web archive. I suspected there was a problem during the sending process, so I sent a second one. I apologize for my mistake.
>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:
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>ERROR: send ioctl failed with -5: Input/Output error
>
>I used btrfs scrub to scan the disk, and the result was:
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>Error summary: csum=1
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>Corrected: 0
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>Uncorrectable: 1
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>Unverified: 0
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>Afterwards, I booted a LiveCD and ran:
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>btrfs check --init-csum-tree
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>During the running process, many outputs similar to this appeared:
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>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
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>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:
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>btrfs check --repair
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>btrfs rescue
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>in an attempt to recover the lost files, but was unsuccessful.
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>The current issues are:
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>How do I recover the lost files?
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>Why does btrfs check --init-csum-tree cause file loss? Is this a bug?
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>LiveCD information:
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>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.
>
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