How can I bind bcache<N>?

[lnsyyj]

Hello everyone,
When I restarted the machine, bcache floated to other devices.
How can I bind bcache?

before reboot
root@ubuntu18:~# lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda           8:0    0  100G  0 disk
└─sda1        8:1    0  100G  0 part /
sdb           8:16   0   20G  0 disk
├─sdb1        8:17   0    5G  0 part
├─sdb2        8:18   0    5G  0 part
└─sdb3        8:19   0    9G  0 part
  ├─bcache0 252:0    0   20G  0 disk
  └─bcache1 252:128  0   20G  0 disk
sdc           8:32   0   20G  0 disk
sdd           8:48   0   20G  0 disk
└─bcache1   252:128  0   20G  0 disk
sde           8:64   0   20G  0 disk
└─bcache0   252:0    0   20G  0 disk
sr0          11:0    1  900M  0 rom  

after reboot
root@ubuntu18:~# lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda           8:0    0  100G  0 disk
└─sda1        8:1    0  100G  0 part /
sdb           8:16   0   20G  0 disk
├─sdb1        8:17   0    5G  0 part
├─sdb2        8:18   0    5G  0 part
└─sdb3        8:19   0    9G  0 part
  ├─bcache0 252:0    0   20G  0 disk
  └─bcache1 252:128  0   20G  0 disk
sdc           8:32   0   20G  0 disk
sdd           8:48   0   20G  0 disk
└─bcache0   252:0    0   20G  0 disk
sde           8:64   0   20G  0 disk
└─bcache1   252:128  0   20G  0 disk
sr0          11:0    1  900M  0 rom