[Bug 1949002] [NEW] can only mount btrfs filesystems with standard crc32c checksum, fails with xxhash, sha256

[Florian Riepen]

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

Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  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

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