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    SubjectRe: 2.7 block ramblings (was Re: DMA for ide-scsi?)
    On Sat, Sep 20 2003, Jeff Garzik wrote:
    > Jens Axboe wrote:
    > >On Tue, Sep 16 2003, Jeff Garzik wrote:
    > >>And we should deprecate them with a solution that aligns what with Linus
    > >>described in Dec 2001 on lkml: a chrdev where userland write(2)s cdbs
    > >>and taskfiles, and read(2)s the results. This is where my thinking
    > >>picked up: if we are creating a chrdev to send "packets" and receive
    > >>responses to those packets............ <insert conclusion here>
    > >
    > >
    > >== bsg, block sg. Did you read what I wrote? :). I started implementing
    > >this and have something that barely works. You just bind a block device
    > >to a /dev/sg* char device and use read/write on that. Aka sg.
    > sg needs some modifications -- for example it errors out instead of
    > sleeps on queue full -- but sounds good to me.

    Definitely. bsg will be a new implementation from scratch, also dumping
    a lot of really (imo) useless "features" that clutter up the code. And
    yes, of course it should honor the typical write(2) model :)

    Jens Axboe

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