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    SubjectRe: Right way to configure a driver? (sysfs, ioctl, proc, configfs,....)
    On Mon, Jan 30, 2006 at 12:23:14PM +0100, Aritz Bastida wrote:
    > Thank you Antonio and Greg
    > But I still have one question pending:
    >
    > > >
    > > > 3.- Actually the most difficult config I must do is to pass three
    > > > values from userspace to my module. Specifically two integers and a
    > > > long (it's an offset to a memory zone I've previously defined)
    > > >
    > > > struct meminfo {
    > > > unsigned int id; /* segment identifier */
    > > > unsigned int size; /* size of the memory area */
    > > > unsigned long offset; /* offset to the information */
    > > > };
    > > >
    > > > How would you pass this information in sysfs? Three values in the same
    > > > file? Note that using three different files wouldn't be atomic, and I
    > > > need atomicity.
    > > >
    >
    > I guess I could pass three values on the same file, like this:
    > $ echo "5 1000 500" > meminfo
    >
    > I know that breaks the sysfs golden-rule, but how can I pass those
    > values _atomically_ then? Having three different files wouldn't be
    > atomic...

    That's what configfs was created for. I suggest using that for things
    like this, as sysfs is not intended for it.

    thanks,

    greg k-h
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