On Mon, Mar 25, 2002 at 12:00:10PM +0000, Brian Foster wrote:
> AFAIK, this is correct. I myself have doubts it ever will be
> possible, as there may be some hairy issues to resolve --- but
> I long ago stopped trying to guess what new "madness" ;-)
> Linux kernel developers would try ....
*bsd systems have had this for years. it's called a union mount.
man mount_union. in addition there's a union option to mount.
> some of the problems include, but may not be limited to:
>> ( we want to, in effect, merge the namespaces of "directory"
> FULL and "directory" ROOM, nominally on different FS/volumes. )
>> 1. both dirs contain a file called A. what happens?
the one on top is seen.
> 2. where are new files which are created written (i.e., which FS)?
on the top directory.
> 3. naïvely, the st_dev --- see stat(2) --- will differ from file
> to file as the merged directory is scanned. albeit this can
> happen anyways (mount points), it's often(?) not handled too
> well by programs which care.
not sure. i'll play later and see.
the example from the man page is this:
mount -t cd9660 -o ro /dev/cd0a /usr/src
mount -t union /var/obj /usr/src
all changes in /usr/src end up in /var/obj.
kevin
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