Re: LANANA: To Pending Device Number Registrants

[Alan Cox]

> But the fact remains that some users want to (a) avoid devfs and (b) have
> static maintenance. And I'm ok with that too, but only if the static major
> number is in the form of a _generic_ number that has absolutely nothing to
> do with any specific drivers (which is why I'd be perfecly ok with still
> adding a "disk" major number, but which is why I do NOT want to have Peter
> give out "the random number of today" to various stupid device drivers).
> So we seem to be in violent agreement here.

Ok.

Then we need to open the second discussion which is:

Given a file handle 'X' how do I find out what ioctl groups I should apply to
it. So we can go from

        if(MAJOR(st.st_rdev) == ST_MAJOR)
                issue_scsi_ioctls
        else if(MAJOR(st.st_rdev) == FTAPE_MAJOR)
                issue_ftape_ioctls
        else ..
        else
                error

to

        /* Use scsi if possible [scsi, ide-scsi, usb-scsi, ...] */
        if(HAS_FEATURE_SET(fd, "scsi-tape"))
                ...
        else if(HAS_FEATURE_SET(fd, "floppy-tape"))
                ..

Alan

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