From: Jamie Lokier <jamie@shareable.org>
To: Szabolcs Szakacsits <szaka@ntfs-3g.org>
Cc: Bob Copeland <me@bobcopeland.com>,
Miklos Szeredi <miklos@szeredi.hu>,
hch@infradead.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0/7] OMFS filesystem version 3
Date: Fri, 18 Apr 2008 12:52:38 +0100 [thread overview]
Message-ID: <20080418115237.GA25089@shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0804181302180.29728@dhcppc2>
Szabolcs Szakacsits wrote:
> If you have the free hot caches then it performs the same as in-kernel
> file systems, user space isn't involved at all.
Presumably if "user space isn't involved at all", it must require that
user space has granted caching rights to the kernel over a FUSE
cache coherency protocol?
Otherwise I don't see how the kernel could coherently cache file pages
for some kinds of FUSE filesystems. (E.g. sshfs, for example: every
operation must surely invoke a user space request or involve granting
a caching right to the kernel, to keep accesses coherent with other
users of the same remote files).
Ergo, either its not coherent, or there is some coherency protocol,
which does require _some_ work in the user space implementation.
-- Jamie
next prev parent reply other threads:[~2008-04-18 11:52 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-12 22:58 [PATCH 0/7] OMFS filesystem version 3 Bob Copeland
2008-04-13 0:03 ` Andrew Morton
2008-04-13 3:33 ` Bob Copeland
2008-04-13 3:55 ` Andrew Morton
2008-04-13 4:41 ` Bob Copeland
2008-04-13 8:01 ` Christoph Hellwig
2008-04-13 8:20 ` Andrew Morton
2008-04-13 8:28 ` Christoph Hellwig
2008-04-13 10:37 ` Miklos Szeredi
2008-04-13 21:15 ` David Woodhouse
2008-04-13 22:44 ` Andrew Morton
2008-04-13 22:49 ` Alan Cox
2008-04-13 23:10 ` Andrew Morton
2008-04-14 1:32 ` Bob Copeland
2008-04-14 5:48 ` Andrew Morton
2008-04-14 8:16 ` Alan Cox
2008-04-14 8:36 ` Andrew Morton
2008-04-14 8:41 ` Christoph Hellwig
2008-04-14 14:20 ` Chris Mason
2008-04-14 16:36 ` Bob Copeland
2008-04-14 16:51 ` Alan Cox
2008-04-14 17:18 ` Bob Copeland
2008-04-14 17:22 ` Alan Cox
2008-04-14 20:29 ` david
2008-04-18 13:13 ` Szabolcs Szakacsits
2008-04-14 20:55 ` Jeff Garzik
2008-04-14 21:11 ` Andrew Morton
2008-04-14 22:32 ` Evgeniy Polyakov
2008-04-14 23:21 ` Andrew Morton
2008-04-14 23:09 ` SL Baur
2008-04-14 23:24 ` Andrew Morton
2008-04-14 8:30 ` Xavier Bestel
2008-04-14 8:43 ` Christoph Hellwig
2008-04-14 8:44 ` Andrew Morton
2008-04-14 9:08 ` Christoph Hellwig
2008-04-14 9:09 ` Christoph Hellwig
2008-04-14 9:21 ` Andrew Morton
2008-04-14 10:09 ` David Woodhouse
2008-04-14 10:22 ` Andrew Morton
2008-04-14 10:36 ` David Woodhouse
2008-04-14 11:16 ` Christoph Hellwig
2008-04-15 15:16 ` Adrian Bunk
2008-04-15 16:57 ` Christoph Hellwig
2008-04-15 18:34 ` Andrew Morton
2008-04-15 18:53 ` Alan Cox
2008-04-15 20:02 ` Andrew Morton
2008-04-15 19:58 ` Alan Cox
2008-04-15 21:46 ` david m. richter
2008-04-15 19:24 ` Adrian Bunk
2008-04-15 20:11 ` Andrew Morton
2008-04-15 20:27 ` Adrian Bunk
2008-04-14 7:25 ` Miklos Szeredi
2008-04-14 7:49 ` Andrew Morton
2008-04-14 8:11 ` Miklos Szeredi
2008-04-14 8:11 ` Anton Altaparmakov
2008-04-14 8:26 ` Miklos Szeredi
2008-04-14 9:42 ` Jamie Lokier
2008-04-14 9:58 ` Miklos Szeredi
2008-04-14 11:05 ` David Woodhouse
2008-04-14 12:50 ` Miklos Szeredi
2008-04-14 11:55 ` Jamie Lokier
2008-04-14 11:57 ` Christoph Hellwig
2008-04-14 12:26 ` Miklos Szeredi
2008-04-14 22:35 ` Jamie Lokier
2008-04-15 11:33 ` Miklos Szeredi
2008-04-15 15:23 ` Jamie Lokier
2008-04-17 1:08 ` Szabolcs Szakacsits
2008-04-17 6:50 ` Jamie Lokier
2008-04-17 8:17 ` Miklos Szeredi
2008-04-14 0:45 ` Bob Copeland
2008-04-14 7:35 ` Miklos Szeredi
2008-04-18 10:30 ` Szabolcs Szakacsits
2008-04-18 11:52 ` Jamie Lokier [this message]
2008-04-18 12:20 ` Miklos Szeredi
2008-04-18 12:57 ` Jamie Lokier
2008-04-18 16:01 ` Miklos Szeredi
2008-04-18 16:15 ` Jamie Lokier
2008-04-18 13:51 ` Bob Copeland
2008-04-18 14:23 ` Miklos Szeredi
2008-04-18 14:43 ` Bob Copeland
2008-04-18 17:35 ` Szabolcs Szakacsits
2008-04-18 17:48 ` Bob Copeland
2008-04-18 12:46 ` Szabolcs Szakacsits
2008-04-13 9:04 ` Alan Cox
2008-04-13 10:00 ` Pavel Machek
2008-04-15 3:14 ` Erez Zadok
[not found] <14725485.776281208170999085.JavaMail.szaka@kolumbus.fi>
2008-04-14 12:46 ` Szabolcs Szakacsits
2008-04-14 13:15 ` Anton Altaparmakov
2008-04-14 16:12 ` Szabolcs Szakacsits
[not found] <10224488.783261208172602425.JavaMail.szaka@kolumbus.fi>
2008-04-15 0:11 ` Szabolcs Szakacsits
2008-04-15 15:05 ` Adrian Bunk
[not found] <aiwLk-3mc-3@gated-at.bofh.it>
[not found] ` <aiwLk-3mc-5@gated-at.bofh.it>
[not found] ` <aiwLk-3mc-1@gated-at.bofh.it>
2008-04-16 9:56 ` Bodo Eggert
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