Re: CD writing in future Linux (stirring up a hornets' nest)

From: Christopher Friesen
Date: Fri Feb 10 2006 - 10:12:15 EST

Joerg Schilling wrote:
"Christopher Friesen" <cfriesen@xxxxxxxxxx> wrote:

There's nothing there that says the mapping cannot change with time...just that it has to be unique.

If it changes over the runtime of a program, it is not unique from the
view of that program.

That depends on what "uniquely identified" actually means.

One possible definition is that at any time, a particular path maps to a single unique st_ino/st_dev tuple.

The other possibility (and this is what you seem to be advocating) is that a st_ino/st_dev tuple always maps to the same file over the entire runtime of the system.

This second possibility seems easily disproved. If you delete and recreate files on a filesystem (assuming nobody has open files in the filesystem), at some point a new file will end up with the same inode as an old (deleted) file. The two files are different, but have the same st_ino/st_dev tuple.

This leaves the first possibility as the only choice...

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