[Bug 1981769] Re: blkid fails to find btrfs zoned filesystem label or uuid

Wed Jul 12 12:15:42 UTC 2023

The problem does not seem to be in util-linux, as it works correctly
with a loop device.

Can you confirm whether you have /dev/disk/by-label/ symlinks for the
new filesystem?

$ lsb_release -cs
jammy

$ truncate -s 15T disk.img
$ DEV=$(sudo losetup --find --show disk.img)

$ sudo mkfs.btrfs -O zoned -d single -m single -f $DEV -L cf1657839355
btrfs-progs v5.16.2
See http://btrfs.wiki.kernel.org for more information.

NOTE: several default settings have changed in version 5.15, please make sure
      this does not affect your deployments:
      - DUP for metadata (-m dup)
      - enabled no-holes (-O no-holes)
      - enabled free-space-tree (-R free-space-tree)

Label:              cf1657839355
UUID:               381ff1f0-714a-411e-95c5-0fbd67979da5
Node size:          16384
Sector size:        4096
Filesystem size:    15.00TiB
Block group profiles:
  Data:             single          256.00MiB
  Metadata:         single          256.00MiB
  System:           single          256.00MiB
SSD detected:       no
Zoned device:       yes
  Zone size:        256.00MiB
Incompat features:  extref, skinny-metadata, no-holes, zoned
Runtime features:   free-space-tree
Checksum:           crc32c
Number of devices:  1
Devices:
   ID        SIZE  PATH
    1    15.00TiB  /dev/loop5

$ sudo blkid | grep $DEV
/dev/loop5: LABEL="cf1657839355" UUID="381ff1f0-714a-411e-95c5-0fbd67979da5" UUID_SUB="0c2c7073-6ee7-4d42-aefe-834cb0a7f1b2" BLOCK_SIZE="4096" TYPE="btrfs"

$ sudo mount LABEL=cf1657839355 /mnt
$ mount | grep /mnt
/dev/loop5 on /mnt type btrfs (rw,relatime,discard=async,space_cache=v2,subvolid=5,subvol=/)

$ ls -l /dev/disk/by-label/
total 0
lrwxrwxrwx 1 root root 11 Jul 12 12:03 UEFI -> ../../sda15
lrwxrwxrwx 1 root root 11 Jul 12 12:11 cf1657839355 -> ../../loop5
lrwxrwxrwx 1 root root 10 Jul 12 12:03 cloudimg-rootfs -> ../../sda1

** Changed in: util-linux (Ubuntu)
       Status: New => Incomplete

** Changed in: util-linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1981769

Title:
  blkid fails to find btrfs zoned filesystem label or uuid

Status in util-linux package in Ubuntu:
  Invalid

Bug description:
  System Info:

  lsb_release -rd
  Description:	Ubuntu 22.04 LTS
  Release:	22.04

  1. Using an HM SMR drive (I used: ST14000NM0007-2G) create a zoned btrfs filesystem

  sudo mkfs.btrfs -O zoned -d single -m single -f /dev/sdb -L cf1657839355
  btrfs-progs v5.16.2
  See http://btrfs.wiki.kernel.org for more information.

  Resetting device zones /dev/sdb (52156 zones) ...
  NOTE: several default settings have changed in version 5.15, please make sure
        this does not affect your deployments:
        - DUP for metadata (-m dup)
        - enabled no-holes (-O no-holes)
        - enabled free-space-tree (-R free-space-tree)

  Label:              cf1657839355
  UUID:               5b7d5659-0ed3-45d3-a36b-fb58eeb93f72
  Node size:          16384
  Sector size:        4096
  Filesystem size:    12.73TiB
  Block group profiles:
    Data:             single          256.00MiB
    Metadata:         single          256.00MiB
    System:           single          256.00MiB
  SSD detected:       no
  Zoned device:       yes
    Zone size:        256.00MiB
  Incompat features:  extref, skinny-metadata, no-holes, zoned
  Runtime features:   free-space-tree
  Checksum:           crc32c
  Number of devices:  1
  Devices:
     ID        SIZE  PATH
      1    12.73TiB  /dev/sdb

  2. Try to use LABEL method to mount

  sudo mount LABEL=cf1657839355 cf1657839355
  mount: cf1657839355: can't find LABEL=cf1657839355.

  Expected that LABEL would be found.  I suspect that libblkid is where
  the issue is since this commands returns all of my other block devices
  except for /dev/sdb.

  sudo blkid|grep sdb

  It will mount using hard coded device path

  sudo mount /dev/sdb cf1657839355
  df -h /dev/sdb
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sdb         13T  3.5M   13T   1% /cf1657839355
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  DistroRelease: Ubuntu 22.04
  InstallationDate: Installed on 2021-05-20 (421 days ago)
  InstallationMedia: Ubuntu-Server 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  Package: util-linux 2.37.2-4ubuntu3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 5.15.0-41.44-generic 5.15.39
  Tags:  jammy uec-images
  Uname: Linux 5.15.0-41-generic x86_64
  UpgradeStatus: Upgraded to jammy on 2022-07-14 (1 days ago)
  UserGroups: N/A
  _MarkForUpload: True

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