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    SubjectRe: Reading a file inside the device driver.
       Date: Wed, 26 Jul 2000 20:09:15 +0100 (BST)
    From: Tigran Aivazian <>

    > There are games you can play to get around this, but such approaches are
    > fragile and complicated, and not what I'd recommend.

    ok, then I'd recommend it instead :)

    Vinay, have a look at how fs/exec.c:sys_uselib() (uselib(2) system
    call) works by using name lookup and then dentry_open() and

    sys_uselib doesn't actually try to use f_op->read. For that, you have
    to look at kernel_read(); note the magic calls to set_fs(get_ds()) and
    setfs(old_fs). This does work, but it's not something which I suspect
    we want to encourage wide-spread usage of in the kernel.

    In general, it's far better to do file i/o outside the kernel than
    inside the kernel, if it is at all possible.

    - Ted

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