Verification done on xenial-proposed. Now libblkid1 detects only the bcache superblock and prints udev/uuid variables.
$ lsb_release -cs xenial
$ DISK_IMG=disk.img $ rm -f $DISK_IMG $ dd if=/dev/zero of=$DISK_IMG bs=1G count=0 seek=1 $ BACKING_DEV=$(sudo losetup --find --show $DISK_IMG) $ sudo make-bcache -B $BACKING_DEV $ BCACHE_DEV="$(readlink -e /sys/block/$(basename $BACKING_DEV)/bcache/dev)" $ BCACHE_DEV="/dev/$(basename $BCACHE_DEV)" $ sudo mkfs.xfs -d agsize=16m -l agnum=0 -f $BCACHE_DEV $ echo 1 | sudo tee /sys/block/$(basename $BCACHE_DEV)/bcache/stop
$ sudo hexdump -C $BACKING_DEV | grep -m2 -e XFSB -e 'fe ed ba be' 00002000 58 46 53 42 00 00 10 00 00 00 00 00 00 03 f0 00 |XFSB............| 00007000 fe ed ba be 00 00 00 01 00 00 00 02 00 00 00 14 |................|
xenial-updates: ---
$ dpkg -s libblkid1 | grep -i version Version: 2.27.1-6ubuntu3.9
$ sudo blkid -o udev -p $BACKING_DEV ID_FS_AMBIVALENT=other:bcache other:xfs_external_log
xenial-proposed: ---
$ apt-cache madison libblkid1 | grep proposed libblkid1 | 2.27.1-6ubuntu3.10 | http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
$ sudo apt install libblkid1 -y
$ dpkg -s libblkid1 | grep -i version Version: 2.27.1-6ubuntu3.10
$ sudo blkid -o udev -p $BACKING_DEV ID_FS_UUID=6cdf846c-52ea-4f24-8554-7302c41bca8f ID_FS_UUID_ENC=6cdf846c-52ea-4f24-8554-7302c41bca8f ID_FS_TYPE=bcache ID_FS_USAGE=other
Verification done on xenial-proposed.
Now libblkid1 detects only the bcache superblock and prints udev/uuid variables.
$ lsb_release -cs
xenial
$ DISK_IMG=disk.img DEV="$( readlink -e /sys/block/ $(basename $BACKING_ DEV)/bcache/ dev)" DEV="/dev/ $(basename $BCACHE_DEV)" $(basename $BCACHE_ DEV)/bcache/ stop
$ rm -f $DISK_IMG
$ dd if=/dev/zero of=$DISK_IMG bs=1G count=0 seek=1
$ BACKING_DEV=$(sudo losetup --find --show $DISK_IMG)
$ sudo make-bcache -B $BACKING_DEV
$ BCACHE_
$ BCACHE_
$ sudo mkfs.xfs -d agsize=16m -l agnum=0 -f $BCACHE_DEV
$ echo 1 | sudo tee /sys/block/
$ sudo hexdump -C $BACKING_DEV | grep -m2 -e XFSB -e 'fe ed ba be'
00002000 58 46 53 42 00 00 10 00 00 00 00 00 00 03 f0 00 |XFSB............|
00007000 fe ed ba be 00 00 00 01 00 00 00 02 00 00 00 14 |................|
xenial-updates:
---
$ dpkg -s libblkid1 | grep -i version
Version: 2.27.1-6ubuntu3.9
$ sudo blkid -o udev -p $BACKING_DEV T=other: bcache other:xfs_ external_ log
ID_FS_AMBIVALEN
xenial-proposed:
---
$ apt-cache madison libblkid1 | grep proposed archive. ubuntu. com/ubuntu xenial- proposed/ main amd64 Packages
libblkid1 | 2.27.1-6ubuntu3.10 | http://
$ sudo apt install libblkid1 -y
$ dpkg -s libblkid1 | grep -i version
Version: 2.27.1-6ubuntu3.10
$ sudo blkid -o udev -p $BACKING_DEV 6cdf846c- 52ea-4f24- 8554-7302c41bca 8f ENC=6cdf846c- 52ea-4f24- 8554-7302c41bca 8f
ID_FS_UUID=
ID_FS_UUID_
ID_FS_TYPE=bcache
ID_FS_USAGE=other