Alright, summarizing this so far, we have the following fixes landed in
Groovy:
udev (systemd pkg):
- 60-persistent-storage.rules: skip_bcache_fs_type:
- /dev/disk/by-uuid/_ and /dev/disk/by-label/_ not created for bcache devs
Since it does not make sense to have the caching device symlink like if
it was a regular filesystem disk to be used:
(k)rafaeldtinoco@bcache:~$ ls -lah /dev/disk/by-uuid
total 0
drwxr-xr-x 2 root root 100 Jul 21 18:49 .
drwxr-xr-x 7 root root 140 Jul 21 17:39 ..
lrwxrwxrwx 1 root root 10 Jul 21 17:39 022E-07E1 -> ../../vda1
lrwxrwxrwx 1 root root 13 Jul 21 18:49 50b98f0d-c0e0-49d2-9856-8ac6bc91e232 ->
../../bcache0
lrwxrwxrwx 1 root root 10 Jul 21 17:39 67993d4f-fa55-49b1-886e-c692f88393ba ->
../../vda2
- 69-bcache.rules:
- if any other driver - than bcache - touches /dev/bcache[0-9]*
bcache/by-uuid/_ (BCACHE_CACHED_UUID and LABEL) symlinks are
recreated.
To address the udev event responsible for wiping /dev/bcache/by-uuid,
like:
KERNEL[4175.725930] change /devices/virtual/block/bcache0 (block)
ACTION=change
DEVPATH=/devices/virtual/block/bcache0
SUBSYSTEM=block
SYNTH_UUID=0
DEVNAME=/dev/bcache0
DEVTYPE=disk
SEQNUM=6746
MAJOR=251
MINOR=0
UDEV [4175.758078] change /devices/virtual/block/bcache0 (block)
ACTION=change
DEVPATH=/devices/virtual/block/bcache0
SUBSYSTEM=block
SYNTH_UUID=0
DEVNAME=/dev/bcache0
DEVTYPE=disk
SEQNUM=6746
USEC_INITIALIZED=4151438558
ID_FS_UUID=50b98f0d-c0e0-49d2-9856-8ac6bc91e232
ID_FS_UUID_ENC=50b98f0d-c0e0-49d2-9856-8ac6bc91e232
ID_FS_VERSION=1.0
ID_FS_TYPE=ext4
ID_FS_USAGE=filesystem
MAJOR=251
MINOR=0
DEVLINKS=/dev/disk/by-uuid/50b98f0d-c0e0-49d2-9856-8ac6bc91e232
TAGS=:systemd:
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1861941
Title:
bcache by-uuid links disappear after mounting bcache0
Status in bcache-tools package in Ubuntu:
Fix Released
Status in systemd package in Ubuntu:
Fix Released
Status in bcache-tools source package in Bionic:
Triaged
Status in systemd source package in Bionic:
Triaged
Status in bcache-tools source package in Focal:
Confirmed
Status in systemd source package in Focal:
Triaged
Bug description:
1.
root@ubuntu:~# lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
2.
root@ubuntu:~# lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
root@ubuntu:~# apt-cache policy linux-image-virtual
linux-image-virtual:
Installed: 5.4.0.12.15
Candidate: 5.4.0.12.15
Version table:
*** 5.4.0.12.15 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
root@ubuntu:~# apt-cache policy linux-image-5.4.0-12-generic
linux-image-5.4.0-12-generic:
Installed: 5.4.0-12.15
Candidate: 5.4.0-12.15
Version table:
*** 5.4.0-12.15 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
3. mount /dev/bcache0 && ls -al /dev/bcache/by-uuid/
+ ls -al /dev/bcache/by-uuid/
total 0
drwxr-xr-x 2 root root 60 Feb 4 23:31 .
drwxr-xr-x 3 root root 60 Feb 4 23:31 ..
lrwxrwxrwx 1 root root 13 Feb 4 23:31 abdfd1f6-44ce-4266-91db-24667b9ae51a
-> ../../bcache0
4.
root@ubuntu:~# ls -al /dev/bcache/by-uuid
ls: cannot access '/dev/bcache/by-uuid': No such file or directory
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-12-generic 5.4.0-12.15
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
Date: Tue Feb 4 23:31:52 2020
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-5.4
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/bcache-tools/+bug/1861941/+subscriptions
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