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    SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
    On Fri, Feb 10, 2006 at 03:32:28PM +0100, Joerg Schilling wrote:
    > > Chapter and verse, please?
    > >
    > > Can you please list the POSIX standard, section, and line number which
    > > states that a particular device must always have the same st_rdev
    > > across reboots, and hot plugs/unplugs?
    >
    > A particular file on the system must not change st_dev while the system
    > is running.
    >
    > http://www.opengroup.org/onlinepubs/009695399/basedefs/sys/stat.h.html

    1) File != device.

    2) st_dev != st_rdev

    3) The reference you specified says nothing about st_dev (or st_rdev)
    being invariant while the system is runnning. Line number, please?

    4) POSIX/SUS is very careful not to define what dev_t. Use of mknod to
    create block/chracter devices, and depending on any properties of
    dev_t is likely to get you into trouble.

    5) The st_rdev of a particular file, like /dev/hda *does* remain
    invariant. The device which it points to may change, but that's a
    different matter --- and POSIX/SUS is very deliberately silent on your
    subject.

    THEREFORE, your claim that Linux's behaviour violates POSIX/SUS is
    demonstrably false. Quod erat demonstratum.

    - Ted
    -
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