Re: Hard links and Auto Mounting

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On Thu, Feb 27, 2003 at 02:31:11AM +0800, Jeffrey Lim wrote:
> is this because the inodes are only guaranteed to be _unique_ within a
> filesystem - and not *across* filesystems?

Inode numbers are not unique across filesystems. But inode numbers are
not needed for anything whatsoever within VFS layer itself. They are
used for looking up inodes on _disks_, for hashing them (but the driver
is not required to use the inode hash) and userland uses them as
a heuristics to detect linked files (heuristics, because it does not
work even for some disk filesystem - when you come back to file on FAT
after some hours, it's inode number will probably have changed!).

> -jf
> 
> On Wed, 26 Feb 2003 12:49:30 -0500, "Balint, Jess" <JBalint@alldata.net>
> said:
> > Allen,
> > 
> > The reason that you cannot create a hard link on a remote file system is
> > because it has to be done of the system that the fs is local. That is why
> > you can login to the box, then create the link and logout and it shows
> > remotely. I think it is taken care of somewhere in the vfs layer.
> > 
> > jess
> > 
> > > -----Original Message-----
> > > From: Allen Curtis [mailto:acurtis@onz.com]
> > > Sent: Wednesday, February 26, 2003 10:09 AM
> > > To: Newbies
> > > Subject: Hard links and Auto Mounting
> > > 
> > > 
> > > I was wondering if someone could explain this too me.
> > > 
> > > What is the difference when trying to create hard links on a 
> > > local drive vs.
> > > a remote auto mounted drive? In either case the links are 
> > > being made to
> > > files on the same physical disk. However you cant actually 
> > > create hard links
> > > unless it is recognized as a local drive. e.g. If you ssh 
> > > into the remote
> > > machine, create the links, then exit, everything is fine.
> > > 
> > > TIA
> > --
> > Kernelnewbies: Help each other learn about the Linux kernel.
> > Archive:       http://mail.nl.linux.org/kernelnewbies/
> > FAQ:           http://kernelnewbies.org/faq/
> > 
> > 
>  
> --
>   "It's an extraordinary world!" - jfsworld <at> fastmail.fm
>  
>  
> --
> Kernelnewbies: Help each other learn about the Linux kernel.
> Archive:       http://mail.nl.linux.org/kernelnewbies/
> FAQ:           http://kernelnewbies.org/faq/
> 
-------------------------------------------------------------------------------
						 Jan 'Bulb' Hudec <bulb@ucw.cz>
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/


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