The Btrfs inode-number epic (part 2: solutions)

The first installment in this two-part series looked at the difficulties that arise when Btrfs filesystems containing subvolumes are exported via NFS. Btrfs has a couple of quirks that complicate life in this situation: the use of separate device numbers for subvolumes and the lack of unique inode numbers across the filesystem as a whole. Recently, Neil Brown set off on an effort to try to solve these problems, only to discover that the situation was even more difficult than expected and that many attempts would be required.

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