Comment 84 for bug 1861941

Bionic verification:

$ apt changelog bcache-tools | head -10

bcache-tools (1.0.8-2ubuntu0.18.04.1) bionic; urgency=medium

  [ Ryan Harper ]
  * Add helper script to read bcache devs superblock (LP: #1861941)

 -- Rafael David Tinoco <email address hidden> Wed, 05 Aug 2020 17:44:05 -0300

bcache-tools (1.0.8-2build1) artful; urgency=medium

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$ dpkg-query -f '${Package}###${Version}\n' -W 'bcache-tools'
bcache-tools###1.0.8-2ubuntu0.18.04.1

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$ sudo ./test-bcache.sh
/mnt is a mountpoint
/dev/bcache0: 2 bytes were erased at offset 0x00000438 (ext4): 53 ef
writing 1 to /sys/class/block/bcache0/bcache/stop
writing 1 to /sys/fs/bcache/60412675-9103-47b0-9794-91fcfb12d50d/stop
/dev/vdc: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.0173157 s, 606 MB/s
/dev/vdb: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.00634546 s, 1.7 GB/s
UUID: c3758ea3-0e2c-42e3-bb77-da27292d2476
Set UUID: b2b21f55-3599-461a-b162-8377d85fbc34
version: 0
nbuckets: 2048
block_size: 1
bucket_size: 1024
nr_in_set: 1
nr_this_dev: 0
first_bucket: 1
UUID: f4001b7e-386e-4ca3-a5e0-d53f100d156f
Set UUID: b2b21f55-3599-461a-b162-8377d85fbc34
version: 1
block_size: 1
data_offset: 16
/dev/vdc
tee: /sys/fs/bcache/register: Invalid argument
/dev/vdb
tee: /sys/fs/bcache/register: Invalid argument
total 0
drwxr-xr-x 2 root root 60 Aug 21 14:03 .
drwxr-xr-x 3 root root 60 Aug 21 14:03 ..
lrwxrwxrwx 1 root root 13 Aug 21 14:03 f4001b7e-386e-4ca3-a5e0-d53f100d156f -> ../../bcache0
Creating filesystems on bcache0
mke2fs 1.44.1 (24-Mar-2018)
Discarding device blocks: done
Creating filesystem with 262142 4k blocks and 65536 inodes
Filesystem UUID: 4ade91a9-6176-4a93-a34f-158fa08d0091
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376

Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

mounting bcache0 to /mnt
total 0
drwxr-xr-x 2 root root 60 Aug 21 14:03 .
drwxr-xr-x 3 root root 60 Aug 21 14:03 ..
lrwxrwxrwx 1 root root 13 Aug 21 14:03 f4001b7e-386e-4ca3-a5e0-d53f100d156f -> ../../bcache0
Everything OK
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