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    SubjectRe: [PATCH] kdevt-diff
    On Mon, Apr 14, 2003 at 11:00:27AM -0700, Linus Torvalds wrote:
    > Well, the thing is, we absolutely _do_ need to have the 8+8 split, in
    > order to make old devices look the same old way for old binaries.

    Yes, and I support this 100%.

    > The 16+16 split is not strictly necessary, but Andries pointed out to me
    > that there are filesystems etc external storage that only support a 32-bit
    > opaque dev_t, so we'd need to marshall the device number _some_ way for
    > them anyway, and having a standard way to do that is better than having
    > everybody come up with their own variations.

    Sure, but it's a marshall, not a reality. One of the reasons
    for choosing 64bits is that we can have large spaces for large things.
    If a driver happens to get a number in the 16:16 space (or the 12:20
    space, which I prefer as well), then it could run out of space and end
    up with the multiple major problem.
    True, a truly dynamic scheme could make all of this irrelevant,
    but I was just postulating that complexity isn't strictly necessary.
    I guess it is a trade off. Do all devices greater than 8:8
    become 32:32 and merely are masked to 16:16 on limited filesystems, or
    do all devices smaller than 16:16/12:20 appear the same on all
    filesystems, limited or not?



    "You can get more with a kind word and a gun than you can with
    a kind word alone."
    - Al Capone

    Joel Becker
    Senior Member of Technical Staff
    Oracle Corporation
    Phone: (650) 506-8127
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