btrfs-progs/Documentation/Custom-ioctls.rst

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Custom ioctls
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Anything that's not doing the other features and stands on it's own
- reverse lookup, from file offset to inode
- resolve inode number -> name
- file offset -> all inodes that share it
- tree search, all the metadata at your hand (if you know what to do with them)
- informative (device, fs, space)
- query/set a subset of features on a mounted fs