Messages in this thread | | | Date | Fri, 10 Feb 2006 09:52:39 -0500 | From | Theodore Ts'o <> | Subject | Re: CD writing in future Linux (stirring up a hornets' nest) |
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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.
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