linux-kernel - Re: If not readdir() then what?

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Date:	Sun, 15 Apr 2007 23:05:11 -0400
From:	Theodore Tso <tytso@....edu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>,
	Jörn Engel <joern@...ybastard.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ulrich Drepper <drepper@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: If not readdir() then what?

On Thu, Apr 12, 2007 at 10:35:49AM -0700, H. Peter Anvin wrote:
> J. Bruce Fields wrote:
> >On Thu, Apr 12, 2007 at 08:21:16AM -0400, Theodore Tso wrote:
> >>Again, compared to a directory fd cache, what you're proposing a huge
> >>hit to the filesystem, and at the moment, given that telldir/seekdir
> >>is rarely used by everyone else, it's mainly NFS which is the main bad
> >>actor here by insisting on the use of a small 31/63-bit cookie as a
> >>condition of protocol correctness.
> >
> >If we want to get bigger cookies into the protocol, then the sooner we
> >start working on that the better....  How big is big enough?  And is a
> >larger cookie sufficient on its own?
> >
> 
> Any fixed size is too small.  It should be a dynamic size.

Idally it should be dynamic, but my guess is that if the cookie were a
fixed 256 bits, it would be sufficient for pretty much all filesystems.  

						- Ted

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