From: Theodore Ts'o (tytso@mit.edu)
Date: 12/16/04-08:56:46 PM Z
Date: Thu, 16 Dec 2004 21:56:46 -0500
From: "Theodore Ts'o" <tytso@mit.edu>
Subject: Re: [nfsv4] NFSv4 ACLs: {READ,WRITE}_NAMED_ATTRIBUTES
Message-ID: <20041217025646.GA5145@thunk.org>
On Thu, Dec 16, 2004 at 11:42:26AM -0800, Gordon Waidhofer wrote:
>
> Ultimately, everybody should steer toward Solaris
> style named subfiles. Solaris should rename the
> mechanism. So should NFSv4.
I disagree. I can very easily forsee a future where filesystems have
both "extended attributes" (i.e., an atomic set/get facility for small
metadata items) and "sub-files". Of course, as soon as sub-files
start having permissions and access controls associated with them,
then files with subfiles start looking an awful lot like a directory
with a default file if the directory is opened as a file instead of a
directory. NTFSv5 has both facilities, for example.
The two provide different semantics, and can have very different
performance implications. If it weren't too late, I'd argue that
NFSv4 NAMED_ATTRIBUTES should be renamed to something less confusing,
and that adding an EXTENDED_ATTRIBUTES extension which has an atomic
set/get facility would be a good thing.
- Ted
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