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In-Reply-To: <1167f7cb-e4d7-0d6d-5025-1903fb3b1888@samba.org>
From: Steve French <smfrench@gmail.com>
Date: Tue, 28 Aug 2018 16:23:24 -0500
Message-ID: <CAH2r5msqKZa6qKCYuFYW2Z+51kJWLo1vJ2L=NUfMjvq5p6kCbw@mail.gmail.com>
Subject: Re: Streams support in Linux
To: "Stefan (metze) Metzmacher" <metze@samba.org>
Cc: Jeremy Allison <jra@samba.org>, Theodore Tso <tytso@mit.edu>,
        samba-technical <samba-technical@lists.samba.org>,
        Matthew Wilcox <willy@infradead.org>, ebiggers@kernel.org,
        Al Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        =?UTF-8?B?UmFscGggQsO2aG1l?= <slow@samba.org>
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On Tue, Aug 28, 2018 at 4:19 PM Stefan Metzmacher <metze@samba.org> wrote:
>
> Am 28.08.2018 um 22:47 schrieb Jeremy Allison via samba-technical:
> > On Tue, Aug 28, 2018 at 03:43:45PM -0500, Steve French wrote:
> >>
> >> In theory I could construct a struct fd by setting up a struct file on the fly
> >> (see "alloc_empty_file" for example) and the few dozen fields in it,
> >> but it would be a lot easier to return them as xattrs with a reserved
> >> prefix (e.g. "streams")
> >> since most of these are small (some examples) and could have been
> >> stored in xattrs
> >> if the Apple or Windows developers had wanted to
> >>
> >> "streams.ZoneIdentifier" (for Internet Explorer download security info)
> >> "streams.favicon"  (for Internet explorer icons)
> >> "streams.AFP_AfpInfo" and "streams.AFP_Resource" (for two common Mac streams)
> >> "streams.XPRESS" (for compression)
> >
> > Hmmm. Yeah, I guess this works if you can ensure
> > the prefix is reserved.
>
> Remember some of the AFP stream can get very large, Ralph should have
> more details about it.
>
> Also from reading [MS-FSA] I have the impression that opens on stream
> would also support oplocks/leases as well as byte range locks.

Larger than 8MB (maximum i/o size for read)?


-- 
Thanks,

Steve