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    SubjectRe: LANANA: To Pending Device Number Registrants

    On Tue, 15 May 2001, Alan Cox wrote:
    > 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

    Ugh. You do this?

    And you don't realize that the whole system is too broken for words?

    What is the horrible app that does something like this?

    The fix, I think, is to make the ioctl commands much more regular. That is
    probably true in general, and fixing that would hopefully fix the need for
    horrible code like the above.

    That said:

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

    doesn't look horrible, and I don't see why we couldn't expose the "driver
    name" for any file descriptor. We already do for some: "fstatfs()" is
    largely the same thing on another level.


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