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    SubjectRe: New IOCTLs
    * Singaravelan Nallasellan <singaravelann@gmail.com> wrote:

    Hi,

    > The driver needs to assign an id for each open and create a sysfs
    > entry based on that id and expose some properties.
    >
    > For example, if the driver assigns an id 2, the sysfs entry will be as below:
    > /sys/class/xxx/<drivername>/2/version
    >
    > When the driver close is invoked, it will have to remove the entry.
    >
    > The issue here is that the application needs:
    > 1. To know the id it should use to access properties after the open.
    > 2. To have exclusive access to the sysfs entries. No other application
    > should and open the entry and use it. There is a chance the the other
    > application could open the entries before this application opens it.

    Simply add an clone file, reading from it creates new context and
    sends back its ID.

    box:/ # cat /sys/class/xxx/foodriver/clone
    3

    box:/ # cat /sys/class/xxx/foodriver/3/version
    1.0

    ...

    To destroy the context:
    box:/ # echo "release" > /sys/class/xxx/foodriver/3/ctl


    cu
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