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    SubjectRe: userspace block driver?
    Oliver Neukum wrote:

    >On Wed, 9 Nov 2005, Jeff Garzik wrote:
    >
    >
    >
    >>Has anybody put any thought towards how a userspace block driver would work?
    >>
    >>Consider a block device implemented via an SSL network connection. I don't
    >>want to put SSL in the kernel, which means the only other alternative is to
    >>pass data to/from a userspace daemon.
    >>
    >>
    >
    >I am afraid this is impossible without some heavy infrastructure work.
    >You will almost inevitably deadlock. Yes, you can mlock() your driver, but
    >that still will not tell the kernel that GFP_KERNEL must be replaced with
    >GFP_NOIO if it is triggered by syscalls you are doing.
    >
    >
    >
    A simple patch can help here (in addition to mlockall()):

    http://www.ussg.iu.edu/hypermail/linux/kernel/0407.3/0297.html

    you might want to increase the free memory target as well.
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