Issue when mkfs.btrfs on a bcached partition

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Hi,

Here is what I did:
 # make-bcache -C /dev/sdb1
 # echo "UUID" > /sys/block/bcache0/bcache/attach
--------------------------------------
$ lsblk -o
.......................
sdb                      sdb
└─sdb1                   sdb1    bcache
  └─bcache0              bcache0
--------------------------------
# mkfs.btrfs -L poppy-root /dev/sdb1
/dev/sdb1 appears to contain an existing filesystem (bcache).
Error: Use the -f option to force overwrite.


Please may you tell what is wrong and how can I make btrfs on bcached partition?

Thank you
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