How to copy a btrfs subvolume to another volume (partition/disk)?

The btrfs utility has two commands to write and read a subvolume to a general file, which can be a stdout/stdin too. They are 'send' and 'receive'.

Note that 'send' and 'receive' are designed for backup purposes. The received subvolume copy will be initially readonly. You have to normalize the copied subvolume with snapshot.

Reference command sequence for copying subvolumes:

1. Create a readonly snapshot copy of the subvolume to be copied:
btrfs subvolume snapshot /mnt/vol_0/sub /mnt/vol_0/sub.snapshot
btrfs subvolume snapshot -r /mnt/vol_0/sub.snapshot /mnt/vol_0/sub.readonly

1. Copy the subvolume to another volume:
btrfs subvolume send /mnt/vol_0/sub.readonly | btrfs receive /mnt/vol_1/

2. Normalize the readonly subvolume copy with snapshot:
btrfs subvolume snapshot /mnt/vol_1/sub.readonly /mnt/vol_1/sub

3. (Optional) Now the copied subvolume is available at /mnt/vol_1/sub for both read and write. The readonly copy can be deleted safely:
btrfs subvolume delete /mnt/vol_0/sub.readonly
btrfs subvolume delete /mnt/vol_1/sub.readonly

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