[Bug 1949971] Re: failed to open /dev/btrfs-control, skipping device registration: No such file or directory

[Ken Sharp]

> /etc/mkinitcpio.conf >> brtfs

Did you really add brtfs instead of btrfs?

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Title:
  failed to open /dev/btrfs-control, skipping device registration: No
  such file or directory

Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Description:    Ubuntu 20.04.3 LTS
  Release:        20.04

  ---------------------------------------------

  btrfs-progs:
    Installed: 5.4.1-2
    Candidate: 5.4.1-2
    Version table:
   *** 5.4.1-2 500
          500 http://ch.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  --------------------------------------------------

  created partition on all disks with fdisk.

  -------------

  sudo mkfs.btrfs -d single --csum blake2b -L bt01_01 /dev/sde1
  /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1

  btrfs created volume

  -------------------------

  /etc/mkinitcpio.conf >> brtfs

  --------------

  reboot

  -----------------------

  brtfs module not loaded/used by anything

  ------------------

  modprobe -r brtfs

  brtfs device scan
  Scanning for Btrfs filesystems
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory
  WARNING: failed to open /dev/btrfs-control, skipping device registration: No such file or directory

  
  --------------------

  
  lsblk -f

  sde
  └─sde1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdf
  └─sdf1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdg
  └─sdg1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdh
  └─sdh1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdi
  └─sdi1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdj
  └─sdj1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdk
  └─sdk1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4
  sdl
  └─sdl1                    btrfs       bt01_01 c6b60114-4b48-4659-8fcf-eb820fb1f8d4

  ------------------------------------------------

  kernel wiki

   I get the message "failed to open /dev/btrfs-control skipping device
  registration" from "btrfs dev scan"

  You are missing the /dev/btrfs-control device node. This is usually
  set up by udev. However, if you are not using udev, you will need to
  create it yourself:

  # mknod /dev/btrfs-control c 10 234

  /dev/btrfs-control already exists.

  ------------------

  no idea what is going on, it supposes to work from scratch. single
  device doesn't work either.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: btrfs-progs 5.4.1-2
  ProcVersionSignature: Ubuntu 5.4.0-89.100-generic 5.4.143
  Uname: Linux 5.4.0-89-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Fri Nov  5 12:52:40 2021
  InstallationDate: Installed on 2021-10-21 (14 days ago)
  InstallationMedia: Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20210824)
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  SourcePackage: btrfs-progs
  UpgradeStatus: No upgrade log present (probably fresh install)

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