When operating from inside a mounted btrfs subvolume which is not the
root subvolume "btrfs send" exits with the error:
ERROR: open <subvolume path> failed. No such file or directory
Steps to reproduce:
1. mkfs.btrfs /dev/sda1
2. mount /dev/sda1 /mnt
3. btrfs subvolume create /mnt/foo
4. umount /mnt
5. mount -o subvol=foo /dev/sda1 /mnt
6. btrfs subvolume snapshot -r /mnt /mnt/snap
7. btrfs send /mnt/snap > /dev/null
-> ERROR: open foo/snap failed. No such file or directory
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