Public bug reported:
I created a new btrfs filesystem like the following:
sudo mkfs.btrfs -L cold_storage -f --csum xxhash /dev/sdd1
Mounting it with:
sudo mount /dev/sdb1 /mnt/cold_storage
Fails with the message:
mount: /mnt/cold_storage: wrong fs type, bad option, bad superblock on
/dev/sdd1, missing codepage or helper program, or other error.
Looking at dmesg | tail I can find the following:
[ 1788.813725] BTRFS error (device sdd1): unsupported checksum algorithm: 1
[ 1788.836552] BTRFS error (device sdd1): open_ctree failed
The error is the same for the xxhash and sha256 checksums. Only
recreating the filesystem with crc32c / omitting the --csum option
entirely allows me to mount it afterwards. I tried mounting with and
without compression enabled, no difference.
My System:
lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
uname -a
Linux pentiumpower 5.4.0-89-generic #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC
2021 x86_64 x86_64 x86_64 GNU/Linux
btrfs version
btrfs-progs v5.4.1
apt-cache policy btrfs-progs
btrfs-progs:
Installiert: 5.4.1-2
Installationskandidat: 5.4.1-2
Versionstabelle:
*** 5.4.1-2 500
500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: btrfs-progs (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1949002
Title:
can only mount btrfs filesystems with standard crc32c checksum, fails
with xxhash, sha256
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