Corrupted btrfs?

Corrupted btrfs?

[Josh Rodgers]

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I had an issue with my unraid server where after upgrading to 7.0.1 my cache drive is showing unmountable or no filesystem. I ran a btrfs check and i received the attached output from that check. I wanted to consult the experts before doing any repair. 
Thank you,

Josh Rodgers

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sudo btrfs check --readonly /dev/nvme0n1p1
Opening filesystem to check...
Checking filesystem on /dev/nvme0n1p1
UUID: 0d842f39-ee87-4941-ad71-ee07ec699fb0
[1/8] checking log
[2/8] checking root items
[3/8] checking extents
inline extent refs out of order: key [10259591802880,168,4096]
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32702817 offset 258048) wanted 0 have 1
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32688097 offset 258048) wanted 0 have 1
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32660600 offset 258048) wanted 0 have 1
data extent[10259591802880, 4096] bytenr mimsmatch, extent item bytenr 10259591802880 file item bytenr 0
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32660600 offset 1306624) wanted 1 have 0
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32674309 offset 258048) wanted 0 have 1
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32645602 offset 258048) wanted 0 have 1
data extent[10259591802880, 4096] referencer count mismatch (root 5 owner 32598439 offset 258048) wanted 0 have 1
backpointer mismatch on [10259591802880 4096]
ERROR: errors found in extent allocation tree or chunk allocation
[4/8] checking free space tree
[5/8] checking fs roots
[6/8] checking only csums items (without verifying data)
[7/8] checking root refs
[8/8] checking quota groups skipped (not enabled on this FS)
found 84019183616 bytes used, error(s) found
total csum bytes: 60546480
total tree bytes: 489340928
total fs tree bytes: 323567616
total extent tree bytes: 81166336
btree space waste bytes: 92348555
file data blocks allocated: 1082956144640
 referenced 87034966016

Re: Corrupted btrfs?

[Qu Wenruo]

在 2025/8/5 10:32, Josh Rodgers 写道:
> I had an issue with my unraid server where after upgrading to 7.0.1 my 
> cache drive is showing unmountable or no filesystem. I ran a btrfs check 
> and i received the attached output from that check. I wanted to consult 
> the experts before doing any repair.

This type of corruption seems to be caused by a regression in ntfs2btrfs 
or winbtrfs. That regression itself should have been fixed, the damage 
is persistent though.

If that's the case, considering that's the only corruption, it's 
possible btrfs check --repair (latest release) can repair it.

Thanks,
Qu

> 
> Thank you,
> 
> Josh Rodgers