linux-kernel - Re: Finding hardlinks

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Date:	Wed, 03 Jan 2007 00:14:28 +0100
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Benny Halevy <bhalevy@...asas.com>,
	Jan Harkes <jaharkes@...cmu.edu>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	nfsv4@...f.org
Subject: Re: Finding hardlinks

On Sat, 2006-12-30 at 02:04 +0100, Mikulas Patocka wrote:
> 
> On Fri, 29 Dec 2006, Trond Myklebust wrote:
> 
> > On Thu, 2006-12-28 at 19:14 +0100, Mikulas Patocka wrote:
> >> Why don't you rip off the support for colliding inode number from the
> >> kernel at all (i.e. remove iget5_locked)?
> >>
> >> It's reasonable to have either no support for colliding ino_t or full
> >> support for that (including syscalls that userspace can use to work with
> >> such filesystem) --- but I don't see any point in having half-way support
> >> in kernel as is right now.
> >
> > What would ino_t have to do with inode numbers? It is only used as a
> > hash table lookup. The inode number is set in the ->getattr() callback.
> 
> The question is: why does the kernel contain iget5 function that looks up 
> according to callback, if the filesystem cannot have more than 64-bit 
> inode identifier?

Huh? The filesystem can have as large a damned identifier as it likes.
NFSv4 uses 128-byte filehandles, for instance.

POSIX filesystems are another matter. They can only have 64-bit
identifiers thanks to the requirement that inode numbers be 64-bit
unique and permanently stored, however Linux caters for a whole
truckload of filesystems which will never fit that label: look at all
those users of iunique(), for one...

Trond

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