> probably principle of least privilege; the location on physical media
> for a file is clearly something internal to the OS, and non-trusted
> users normally don't have any business knowing that.
FIBMAP isn't correctly locked against misuse, and that requires FIBMAP is
safe against truncate and relocation. There was thread on l/k about this
a month ago or so.
Its also the wrong API (32bit, no notion of extents, compression etc)
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