lkml.org 
[lkml]   [2006]   [Feb]   [10]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 10 Feb 2006 09:13:44 -0600
From"Christopher Friesen" <>
SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
Joerg Schilling wrote:
> "Christopher Friesen" <cfriesen@nortel.com> 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...

Chris
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-10 15:17    [from the cache]
©2003-2008