Re: EXPORT_SYMBOL for chrdev_open 2.4.3

From: Alexander Viro (viro@math.psu.edu)
Date: Fri Apr 13 2001 - 21:29:43 EDT

  • Next message: Jeff V. Merkey: "Re: EXPORT_SYMBOL for chrdev_open 2.4.3"

    On Fri, 13 Apr 2001, Jeff V. Merkey wrote:

    > How are folks supposed to open disk and tape devices from kernel modules
    > without these? Not everything should be done in user space Al. If you

    Normally - filp_open(). If all you want is ioctl on block device -
    blkdev_get() + ioctl_by_bdev() + blkdev_put(). If you want it by
    device _number_ - use bdget().

    > remove blkdev_open I will not be able to properly increment the use
    > count an a disk device I may be reading or writing to.

            Yes, you will. And I would _really_ advice you to do that by
    name instead of device number - that way you will avoid a lot of pain
    couple of years down the road.

    -
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