lkml.org 
[lkml]   [2001]   [Jul]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: NFS Client patch
On Mon, 9 Jul 2001, Trond Myklebust wrote:
> The NFSv2 spec says no such thing. It simply says that you set the
> cookie to zero when you want to start at the beginning of the
> directory. This is only needed when we want to reread the directory
> into the page cache.

Ok, perhaps I mis-spoke slightly. What the spec does state is that the
cookie is opaque. This has generally been interpreted to mean that you
should not trust it to be stable after a change to that directory.

> Your patch will automatically lead to duplicate entries in readdir()
> on most if not all servers whenever the attributes on the inode have
> been refreshed (whether or not the cache has been invalidated). That's
> a bug...

If I were to do a create during a readdir() operation which inserted
itself in the directory before the place it left off, that entry would be
left out of the listing. That is also a bug, wouldn't you think?

I'd also like to point out that every other operating system which I have
tested this with has resulted in the correct behavior (NetBSD, FreeBSD,
Digital Unix, ...)

As for the refresh vs. invalidate problem, I would be happy to add
another time stamp to the in-core nfs inode exclusively for directory
invalidation.

Craig

-
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: 2005-03-22 12:56    [W:0.087 / U:0.244 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site