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    SubjectRe: removable media revalidation - udev vs. devfs or static /dev


    Greg KH wrote:

    >On Wed, Jan 07, 2004 at 10:38:31AM -0800, Linus Torvalds wrote:
    >
    >
    >>On Fri, 2 Jan 2004, Greg KH wrote:
    >>
    >>
    >>>Doesn't the kernel always create the main block device for this device?
    >>>If so, udev will catch that.
    >>>
    >>>
    >>But udev should probably also create all the sub-nodes if it doesn't
    >>already.
    >>
    >>
    >
    >It doesn't, as I thought we could rely on the kernel partition support.
    >
    >
    >
    >>And it really has to create _all_ of them, exactly because there's no way
    >>to know ahead-of-time which of them will be available.
    >>
    >>Then, user space can just access "/dev/sda1" or whatever, and the act of
    >>accessing it will force the re-scan.
    >>
    >>
    >
    >Hm, that would work, but what about a user program that just polls on
    >the device, as the rest of this thread discusses? As removable devices
    >are not the "norm" it would seem a bit of overkill to create 16
    >partitions for every block device, if they need them or not.
    >
    >thanks,
    >
    >greg k-h
    >
    >
    >
    Accessing the partition would not cause the rescan (accessing the whole
    disk causes.) I think devfs does/did this rescan on access.

    --Mika


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