From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] 9pfuse and O_APPEND
Date: Thu, 18 Dec 2008 22:43:52 -0500 [thread overview]
Message-ID: <80c8eabd9be7ed7c3d35f379b7f8007f@quanstro.net> (raw)
In-Reply-To: <31B5545F-E1A1-4526-8450-C81E9D16379D@sun.com>
> Agreed. Now, here's a bit that I still don't quite
> understand: Plan9 does have DMAPPEND on
> a per-Qid basis. Why was it decided not to
> have it on a per-Fid basis (which would match
> POSIX semantics 100%)?
>
> The way I understand -- DMAPPEND is just a hint
> to the server to *alway* ignore the offset in
> incoming writes. It seems that ignoring offsets
> in writes for the Fids that asked for it wouldn't be
> much more difficult, would it?
DMAPPEND, for servers that implement it, is not
a hint to the server, it's a write to the end of the file,
whatever offset that might be.
since the end is computed on the file server, multiple
concurrent writers don't cause a problem. since the
fs is in a position to serialize appends to the same
file.
- erik
next prev parent reply other threads:[~2008-12-19 3:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-18 23:34 Roman Shaposhnik
2008-12-18 23:57 ` Russ Cox
2008-12-19 0:03 ` ron minnich
2008-12-19 3:06 ` Roman Shaposhnik
2008-12-19 3:26 ` ron minnich
2008-12-19 3:59 ` Roman Shaposhnik
2008-12-19 16:44 ` ron minnich
2008-12-19 19:21 ` Anthony Sorace
2008-12-19 19:31 ` erik quanstrom
2008-12-19 19:41 ` ron minnich
2008-12-19 19:59 ` Roman Shaposhnik
2008-12-19 20:06 ` erik quanstrom
2008-12-19 20:18 ` Charles Forsyth
2008-12-21 5:08 ` Roman V. Shaposhnik
2008-12-19 3:03 ` Roman Shaposhnik
2008-12-19 3:43 ` erik quanstrom [this message]
2008-12-19 3:54 ` Roman Shaposhnik
2008-12-19 4:13 ` geoff
2008-12-19 8:23 ` Russ Cox
2008-12-19 19:49 ` Roman Shaposhnik
2008-12-19 19:56 ` erik quanstrom
2008-12-19 20:10 ` Roman Shaposhnik
2008-12-19 20:22 ` erik quanstrom
2008-12-19 20:02 ` ron minnich
2008-12-19 14:21 ` erik quanstrom
2008-12-19 21:00 ` ron minnich
2008-12-19 21:32 ` Charles Forsyth
2008-12-19 21:29 ` ron minnich
2008-12-21 5:05 ` Roman V. Shaposhnik
2008-12-21 14:45 ` erik quanstrom
2008-12-22 10:02 ` roger peppe
2008-12-25 6:04 ` Roman Shaposhnik
2008-12-25 6:33 ` erik quanstrom
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