From: Joel Becker <Joel.Becker@oracle.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@osdl.org>,
Daniel Phillips <phillips@istop.com>,
linux-cluster@redhat.com, wim.coekaerts@oracle.com,
linux-fsdevel@vger.kernel.org, ak@suse.de,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-cluster] Re: GFS, what's remaining
Date: Mon, 5 Sep 2005 16:32:36 -0700 [thread overview]
Message-ID: <20050905233236.GF8684@ca-server1.us.oracle.com> (raw)
In-Reply-To: <1125823035.23858.10.camel@localhost.localdomain>
On Sun, Sep 04, 2005 at 09:37:15AM +0100, Alan Cox wrote:
> I am curious why a lock manager uses open to implement its locking
> semantics rather than using the locking API (POSIX locks etc) however.
Because it is simple (how do you fcntl(2) from a shell fd?), has no
ranges (what do you do with ranges passed in to fcntl(2) and you don't
support them?), and has a well-known fork(2)/exec(2) pattern. fcntl(2)
has a known but less intuitive fork(2) pattern.
The real reason, though, is that we never considered fcntl(2).
We could never think of a case when a process wanted a lock fd open but
not locked. At least, that's my recollection. Mark might have more to
comment.
Joel
--
"In the room the women come and go
Talking of Michaelangelo."
Joel Becker
Senior Member of Technical Staff
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
WARNING: multiple messages have this Message-ID (diff)
From: Joel Becker <Joel.Becker@oracle.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@osdl.org>,
Daniel Phillips <phillips@istop.com>,
linux-cluster@redhat.com, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, ak@suse.de
Subject: Re: Re: GFS, what's remaining
Date: Mon, 5 Sep 2005 16:32:36 -0700 [thread overview]
Message-ID: <20050905233236.GF8684@ca-server1.us.oracle.com> (raw)
In-Reply-To: <1125823035.23858.10.camel@localhost.localdomain>
On Sun, Sep 04, 2005 at 09:37:15AM +0100, Alan Cox wrote:
> I am curious why a lock manager uses open to implement its locking
> semantics rather than using the locking API (POSIX locks etc) however.
Because it is simple (how do you fcntl(2) from a shell fd?), has no
ranges (what do you do with ranges passed in to fcntl(2) and you don't
support them?), and has a well-known fork(2)/exec(2) pattern. fcntl(2)
has a known but less intuitive fork(2) pattern.
The real reason, though, is that we never considered fcntl(2).
We could never think of a case when a process wanted a lock fd open but
not locked. At least, that's my recollection. Mark might have more to
comment.
Joel
--
"In the room the women come and go
Talking of Michaelangelo."
Joel Becker
Senior Member of Technical Staff
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
next prev parent reply other threads:[~2005-09-05 23:33 UTC|newest]
Thread overview: 158+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-01 10:46 GFS, what's remaining David Teigland
2005-09-01 10:42 ` Arjan van de Ven
2005-09-01 10:59 ` Andrew Morton
2005-09-01 10:59 ` Andrew Morton
2005-09-01 14:49 ` Alan Cox
2005-09-01 14:27 ` Christoph Hellwig
2005-09-01 15:28 ` Alan Cox
2005-09-01 15:28 ` Alan Cox
2005-09-01 15:11 ` Lars Marowsky-Bree
2005-09-01 17:56 ` Christoph Hellwig
2005-09-02 7:04 ` David Teigland
2005-09-01 17:23 ` Daniel Phillips
2005-09-01 17:23 ` Daniel Phillips
2005-09-01 20:21 ` Andrew Morton
2005-09-01 20:21 ` Andrew Morton
2005-09-02 21:17 ` Andi Kleen
2005-09-02 23:03 ` Bryan Henderson
2005-09-03 0:16 ` Mark Fasheh
2005-09-03 0:16 ` Mark Fasheh
2005-09-03 6:42 ` Daniel Phillips
2005-09-03 6:42 ` Daniel Phillips
2005-09-03 6:46 ` [Linux-cluster] " Wim Coekaerts
2005-09-03 6:46 ` Wim Coekaerts
2005-09-03 22:21 ` [Linux-cluster] " Daniel Phillips
2005-09-03 22:21 ` Daniel Phillips
2005-09-04 1:09 ` [Linux-cluster] " Joel Becker
2005-09-04 1:32 ` Andrew Morton
2005-09-04 1:32 ` Andrew Morton
2005-09-04 3:06 ` [Linux-cluster] " Joel Becker
2005-09-04 3:06 ` Joel Becker
2005-09-04 4:22 ` [Linux-cluster] " Daniel Phillips
2005-09-04 4:30 ` Joel Becker
2005-09-04 4:51 ` Daniel Phillips
2005-09-04 4:51 ` Daniel Phillips
2005-09-04 5:00 ` [Linux-cluster] " Joel Becker
2005-09-04 5:00 ` Joel Becker
2005-09-04 5:52 ` [Linux-cluster] " Daniel Phillips
2005-09-04 5:56 ` Joel Becker
2005-09-04 4:46 ` Andrew Morton
2005-09-04 4:58 ` Joel Becker
2005-09-04 5:41 ` Andrew Morton
2005-09-04 5:41 ` Andrew Morton
2005-09-04 5:49 ` [Linux-cluster] " Joel Becker
2005-09-04 5:49 ` Joel Becker
2005-09-05 4:30 ` [Linux-cluster] " David Teigland
2005-09-05 4:30 ` David Teigland
2005-09-05 8:54 ` [Linux-cluster] " Andrew Morton
2005-09-05 9:24 ` David Teigland
2005-09-05 9:24 ` David Teigland
2005-09-05 9:19 ` [Linux-cluster] " Andrew Morton
2005-09-05 9:30 ` Daniel Phillips
2005-09-05 9:48 ` David Teigland
2005-09-05 12:21 ` Alan Cox
2005-09-05 12:21 ` Alan Cox
2005-09-05 19:53 ` [Linux-cluster] " Andrew Morton
2005-09-05 23:20 ` Alan Cox
2005-09-05 23:20 ` Alan Cox
2005-09-05 23:06 ` [Linux-cluster] " Andrew Morton
2005-09-05 23:06 ` Andrew Morton
2005-09-14 9:01 ` [Linux-cluster] " Patrick Caulfield
2005-09-14 9:46 ` Antonio Vargas
2005-09-05 19:11 ` kurt.hackel
2005-09-04 6:10 ` Mark Fasheh
2005-09-04 7:23 ` Andrew Morton
2005-09-04 8:17 ` Mark Fasheh
2005-09-04 8:37 ` Andrew Morton
2005-09-04 8:37 ` Andrew Morton
2005-09-04 6:40 ` [Linux-cluster] " Daniel Phillips
2005-09-04 7:28 ` Andrew Morton
2005-09-04 7:28 ` Andrew Morton
2005-09-04 8:01 ` [Linux-cluster] " Joel Becker
2005-09-04 8:18 ` Andrew Morton
2005-09-04 9:11 ` Joel Becker
2005-09-04 9:11 ` Joel Becker
2005-09-04 9:18 ` [Linux-cluster] " Andrew Morton
2005-09-04 9:39 ` Joel Becker
2005-09-04 9:39 ` Joel Becker
2005-09-04 18:03 ` [Linux-cluster] " Hua Zhong
2005-09-04 19:51 ` Daniel Phillips
2005-09-04 19:51 ` Daniel Phillips
2005-09-04 7:12 ` Hua Zhong
2005-09-04 8:37 ` [Linux-cluster] " Alan Cox
2005-09-04 8:37 ` Alan Cox
2005-09-05 23:32 ` Joel Becker [this message]
2005-09-05 23:32 ` Joel Becker
2005-09-03 5:57 ` Daniel Phillips
2005-09-03 5:57 ` Daniel Phillips
2005-09-05 14:14 ` Lars Marowsky-Bree
2005-09-05 14:14 ` Lars Marowsky-Bree
2005-09-05 15:49 ` Daniel Phillips
2005-09-05 16:18 ` Dmitry Torokhov
2005-09-06 0:57 ` Daniel Phillips
2005-09-06 2:03 ` Dmitry Torokhov
2005-09-06 4:02 ` Daniel Phillips
2005-09-06 4:07 ` GFS, what's remainingh Dmitry Torokhov
2005-09-06 4:58 ` Daniel Phillips
2005-09-06 4:58 ` Daniel Phillips
2005-09-06 5:05 ` Dmitry Torokhov
2005-09-06 6:48 ` Daniel Phillips
2005-09-06 6:55 ` Dmitry Torokhov
2005-09-06 7:18 ` Daniel Phillips
2005-09-06 7:18 ` Daniel Phillips
2005-09-06 14:31 ` Dmitry Torokhov
2005-09-06 13:42 ` Alan Cox
2005-09-06 13:42 ` Alan Cox
2005-09-03 7:06 ` GFS, what's remaining Wim Coekaerts
2005-09-03 7:06 ` Wim Coekaerts
2005-09-03 7:27 ` Bernd Eckenfels
2005-09-05 14:16 ` Lars Marowsky-Bree
2005-09-05 20:24 ` Bernd Eckenfels
2005-09-05 20:53 ` Kurt Hackel
2005-09-05 23:37 ` Joel Becker
2005-09-06 5:24 ` Daniel Phillips
2005-09-06 12:55 ` Suparna Bhattacharya
2005-09-03 5:18 ` David Teigland
2005-09-03 6:14 ` Arjan van de Ven
2005-09-03 6:14 ` Arjan van de Ven
2005-09-03 6:42 ` D. Hazelton
2005-09-03 10:35 ` David Teigland
2005-09-03 20:56 ` Daniel Phillips
2005-09-03 20:56 ` Daniel Phillips
2005-09-04 20:33 ` Pavel Machek
2005-09-04 22:18 ` Joel Becker
2005-09-04 22:18 ` Joel Becker
2005-09-05 5:54 ` Theodore Ts'o
2005-09-05 7:09 ` Mark Fasheh
2005-09-05 14:07 ` Theodore Ts'o
2005-09-05 8:27 ` real read-only [was Re: GFS, what's remaining] Pavel Machek
2005-09-05 14:03 ` Theodore Ts'o
2005-09-05 10:44 ` [Linux-cluster] Re: GFS, what's remaining Stephen C. Tweedie
2005-09-05 10:44 ` Stephen C. Tweedie
2005-09-05 16:41 ` Greg Freemyer
2005-09-01 11:35 ` Arjan van de Ven
2005-09-01 11:35 ` Arjan van de Ven
2005-09-02 9:44 ` David Teigland
2005-09-02 11:46 ` Jörn Engel
2005-09-02 11:46 ` Jörn Engel
2005-09-03 5:28 ` Greg KH
2005-09-05 3:47 ` David Teigland
2005-09-05 3:47 ` David Teigland
2005-09-05 8:58 ` Jörn Engel
2005-09-05 9:18 ` David Teigland
2005-09-05 9:18 ` David Teigland
2005-09-05 5:43 ` David Teigland
2005-09-05 5:43 ` David Teigland
2005-09-05 6:32 ` Pekka Enberg
2005-09-05 7:55 ` David Teigland
2005-09-05 7:55 ` David Teigland
2005-09-05 8:00 ` Pekka Enberg
2005-09-05 8:00 ` Pekka Enberg
2005-09-10 10:11 ` Arjan van de Ven
2005-09-05 6:29 ` David Teigland
2005-09-05 6:29 ` David Teigland
2005-09-08 5:41 ` David Teigland
2005-09-08 5:41 ` David Teigland
2005-09-01 12:33 ` Pekka Enberg
2005-09-01 17:27 ` Daniel Phillips
-- strict thread matches above, loose matches on Subject: below --
2005-09-01 18:47 [Linux-cluster] " Hua Zhong (hzhong)
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