Messages in this thread | | | Date | Mon, 21 Apr 2003 19:47:49 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH] new system call mknod64 |
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On Mon, Apr 21, 2003 at 11:44:59AM -0700, Linus Torvalds wrote: > We HAVE to do the mapping somewhere. Old applications only use the lower > 16 bits, and that's just something that MUST NOT be broken. > > The question is only _where_ (not whether) we do the mapping. Right now we > keep "dev_t" in teh same format as we give back to user space, and thus we > always map into that format internally. But we don't have to: we can have > an internal format that is different from the one we show users.
Why do we need to do a mapping? Old applications just won't see the high bits (they're mapped to whatever overflow value) - values that fit into the old 16bit range should never be remapped.
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