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    SubjectRe: [patch for playing] Patch to support 4000 disks and maintain backward compatibility
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    On Fri, 2003-04-11 at 06:42, Andries.Brouwer@cwi.nl wrote:
    > Here is my problem..
    >
    > #insmod ips.o
    > < found 10 disks>
    > #insmod qla2300.o
    > < found 10 disks>
    > #rmmod ips.o
    > <removed 10 disks>
    > #insmod ips.o
    > <found 10 disks - but new names>
    >
    > OK, I see what you mean. I agree.

    Could you elaborate on the reason you want to keep the minor space
    compact? I don't regard the insmod/rmmod problem as valid because if
    you do:

    rmmod ips.o
    rmmod qla2300.o
    insmod qla2300.o
    insmod ips.o

    All bets are off again. For small kernel dev_t it was essential to keep
    a compact minor space because otherwise we coulde run out of minors.
    Sparse minors cause no inefficiency in the mid-layer, or in sd. There
    are problems in sg which could be solved by encoding the device type in
    the minor.

    > [I see that dougg wants to solve such things by properly naming,
    > but that is a higher level. Given a large number space an
    > easier solution is to give each module its own part of the
    > number space.]

    Please, no. Dividing up the minor space like this would be a step
    backwards (adding more policy to the kernel). Someone would also have
    to manage this scheme.

    James


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