FIBMAP/FIEMAP discrepancy for CAP_SYS_RAWIO

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The FIBMAP ioctl requires CAP_SYS_RAWIO, but FIEMAP doesn't.  Why's
that?  Is it that there is no backwards-compatible way to introduce
locking on the bmap path?

(Sorting file access based on the first block number of the file
really improves performance, even compared to inode number sorting,
that's why I'm asking.)
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