[reiserfs-list] Re: [OpenAFS-devel] more on the 2.2.18pre17 SMPcpu hog/etc.

Chris Mason mason@suse.com
Mon, 04 Dec 2000 17:47:05 -0500

On Monday, December 04, 2000 22:46:17 +0100 Andi Kleen <ak@suse.de> wrote:

> On Mon, Dec 04, 2000 at 03:59:00PM -0500, Derek Atkins wrote:
>> > This won't be reiserfs specific since all the new filesystems are
>> > going to need to agree on a way to deal with NFS too.
>> If the Linux VFS is planning to add a method like this, I would
>> certainly be happy to use it :)
> There were plans to add a "key" interface, that would default to the
> current nfsfh.c implementation and could be overwriten per file system.
> Unfortunately it looks like it'll be 2.5 material now :-( That key would
> be somewhat larger than even 64bits though, more like 32bytes. And at
> that size you could also just pass a small filename in. 

The current code yes.  But it makes sense to try and extend it a bit to
support smaller, more arbitrary sizes.  It seems like all of the network
filesystems are going to have the same problem to solve, turning
information about the file into a dentry.

> Also in the end the key would resolve to a dentry.
> For 2.2 and 2.4 reiserfs was using some non standard hacks to add such
> VFS interfaces for NFS, but it is not something that could be generally
> depended on all reiserfs systems (it is dirty enough that it was not even
> be integrated in the normal reiserfs patches) 
> -Andi (who thought that with AFS all that dirty NFS file handle business
> would be gone, and now it is rising its ugly head again..)