[Bug 1377142] Re: Bcache doesn't allow full unregistering without rebooting

[Stefan Bader]

# umount /mnt
# echo 1 >/sys/fs/bcache/a8f70bd1-48df-462f-9a2c-ca4b8af9059c/unregister
# lsblk
NAME      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda         8:0    0   16G  0 disk 
sdb         8:16   0    8G  0 disk 
└─bcache0 251:0    0    8G  0 disk

# echo 1 >/sys/block/bcache0/bcache/stop
# lsblk
NAME  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda     8:0    0   16G  0 disk 
sdb     8:16   0    8G  0 disk

# wipefs -a /dev/sda
/dev/sda: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81
# wipefs -a /dev/sdb
/dev/sdb: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81

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https://bugs.launchpad.net/bugs/1377142

Title:
  Bcache doesn't allow full unregistering without rebooting

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