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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https://bugs.launchpad.net/bugs/1861941
Title:
bcache by-uuid links disappear after mounting bcache0
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