From: Keith Owens <kaos@ocs.com.au>
To: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: explicit dcache <-> user-space cache coherency, sys_mark_dir_clean(), O_CLEAN
Date: Sat, 21 Feb 2004 19:26:32 +1100 [thread overview]
Message-ID: <3762.1077351992@ocs3.ocs.com.au> (raw)
In-Reply-To: Your message of "Sat, 21 Feb 2004 08:58:53 BST." <20040221075853.GA828@elte.hu>
On Sat, 21 Feb 2004 08:58:53 +0100,
Ingo Molnar <mingo@elte.hu> wrote:
>* Ingo Molnar <mingo@elte.hu> wrote:
>> perhaps using a simple 64-bit generation counter would be better.
>> Samba would get a new syscall to get the sum of each generation
>> counter down to the root dentry - a total validation of the pathname.
>> If the counter matches with that in the userspace cache entry then no
>> need to re-create the cache. Such generation counters would be usable
>> for multiple file servers as well. Hm?
>
>generation counters are problematic if they are not persistent. But
>there's a pretty natural persistent 'generation counter' which could be
>used for Samba's purpose: the mtime of the directory ...
>... monotonity is important: two successive directory operations to not be
>possible within the same nanosecond.
Why do you need monotonity? Samba only cares if the dcache entry
changes, the indicator from kernel to user space does not have to be
monotonically increasing, just different.
next prev parent reply other threads:[~2004-02-21 8:27 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-17 4:12 UTF-8 and case-insensitivity tridge
2004-02-17 5:11 ` Linus Torvalds
2004-02-17 6:54 ` tridge
2004-02-17 8:33 ` Neil Brown
2004-02-17 22:48 ` tridge
2004-02-18 0:06 ` Neil Brown
2004-02-18 9:47 ` Helge Hafting
2004-02-17 15:13 ` Linus Torvalds
2004-02-17 16:57 ` Linus Torvalds
2004-02-17 19:44 ` viro
2004-02-17 20:10 ` Linus Torvalds
2004-02-17 20:17 ` viro
2004-02-17 20:23 ` Linus Torvalds
2004-02-17 21:08 ` Robin Rosenberg
2004-02-17 21:17 ` Linus Torvalds
2004-02-17 22:27 ` Robin Rosenberg
2004-02-18 3:02 ` tridge
2004-02-17 23:57 ` tridge
2004-02-17 23:20 ` tridge
2004-02-17 23:43 ` Linus Torvalds
2004-02-18 3:26 ` tridge
2004-02-18 5:33 ` H. Peter Anvin
2004-02-18 7:54 ` Marc Lehmann
2004-02-18 2:37 ` H. Peter Anvin
2004-02-18 3:03 ` Linus Torvalds
2004-02-18 3:14 ` H. Peter Anvin
2004-02-18 3:27 ` Linus Torvalds
2004-02-18 21:31 ` tridge
2004-02-18 22:23 ` Linus Torvalds
2004-02-18 22:28 ` Linus Torvalds
2004-02-18 22:50 ` tridge
2004-02-18 22:59 ` Linus Torvalds
2004-02-18 23:09 ` tridge
2004-02-18 23:16 ` Linus Torvalds
2004-02-19 8:10 ` Jamie Lokier
2004-02-19 16:09 ` Linus Torvalds
2004-02-19 16:38 ` Jamie Lokier
2004-02-19 16:54 ` Linus Torvalds
2004-02-19 18:29 ` Jamie Lokier
2004-02-19 19:48 ` Eureka! (was Re: UTF-8 and case-insensitivity) Linus Torvalds
2004-02-19 19:51 ` Linus Torvalds
2004-02-19 19:48 ` H. Peter Anvin
2004-02-19 20:04 ` Linus Torvalds
2004-02-19 20:05 ` viro
2004-02-19 20:23 ` Linus Torvalds
2004-02-19 20:32 ` Linus Torvalds
2004-02-19 20:45 ` viro
2004-02-19 21:26 ` Linus Torvalds
2004-02-19 21:38 ` Linus Torvalds
2004-02-19 21:45 ` Linus Torvalds
2004-02-19 21:43 ` viro
2004-02-19 21:53 ` Linus Torvalds
2004-02-19 22:21 ` David Lang
2004-02-19 20:48 ` Jamie Lokier
2004-02-19 21:30 ` Linus Torvalds
2004-02-20 0:00 ` Jamie Lokier
2004-02-20 0:17 ` Linus Torvalds
2004-02-20 0:24 ` Linus Torvalds
2004-02-20 0:30 ` Trond Myklebust
2004-02-20 0:54 ` Jamie Lokier
2004-02-20 0:57 ` tridge
2004-02-20 1:07 ` Paul Wagland
2004-02-20 13:31 ` Chris Wedgwood
2004-02-20 0:46 ` Jamie Lokier
2004-02-23 10:13 ` Tim Connors
2004-02-20 1:39 ` Junio C Hamano
2004-02-20 12:54 ` Jamie Lokier
2004-02-19 23:37 ` tridge
2004-02-20 0:02 ` Linus Torvalds
2004-02-20 0:16 ` tridge
2004-02-20 0:37 ` Linus Torvalds
2004-02-20 1:26 ` tridge
2004-02-20 1:07 ` H. Peter Anvin
2004-02-20 2:30 ` Theodore Ts'o
2004-02-20 12:04 ` explicit dcache <-> user-space cache coherency, sys_mark_dir_clean(), O_CLEAN Ingo Molnar
2004-02-20 13:19 ` Jamie Lokier
2004-02-20 13:37 ` Ingo Molnar
2004-02-20 14:00 ` Ingo Molnar
2004-02-20 16:31 ` Jamie Lokier
2004-02-20 13:23 ` [patch] " Ingo Molnar
2004-02-20 18:00 ` viro
2004-02-20 15:41 ` Linus Torvalds
2004-02-20 17:04 ` Ingo Molnar
2004-02-20 17:19 ` Linus Torvalds
2004-02-20 18:48 ` Ingo Molnar
2004-02-21 1:44 ` Jamie Lokier
2004-02-21 7:58 ` Ingo Molnar
2004-02-21 8:04 ` viro
2004-02-21 17:46 ` Ingo Molnar
2004-02-21 18:15 ` Linus Torvalds
2004-02-21 8:26 ` Keith Owens [this message]
2004-02-23 10:59 ` Pavel Machek
2004-02-23 13:55 ` Jamie Lokier
2004-02-23 16:45 ` Ingo Molnar
2004-02-23 17:32 ` Jamie Lokier
2004-02-20 23:00 ` tridge
2004-02-20 17:33 ` Jamie Lokier
2004-02-20 18:22 ` Linus Torvalds
2004-02-21 0:38 ` Jamie Lokier
2004-02-21 1:10 ` Linus Torvalds
2004-02-21 3:01 ` Jamie Lokier
2004-02-20 17:47 ` Jamie Lokier
2004-02-20 20:38 ` Christer Weinigel
2004-02-22 15:07 ` Jamie Lokier
2004-02-22 16:55 ` Miquel van Smoorenburg
2004-02-19 19:08 ` UTF-8 and case-insensitivity Helge Hafting
2004-02-18 4:08 ` tridge
2004-02-18 10:05 ` Robin Rosenberg
2004-02-18 11:43 ` tridge
2004-02-18 12:31 ` Robin Rosenberg
2004-02-18 16:48 ` H. Peter Anvin
2004-02-18 20:00 ` H. Peter Anvin
2004-02-19 2:53 ` Daniel Newby
2004-02-17 5:25 ` Tim Connors
2004-02-17 7:43 ` H. Peter Anvin
2004-02-17 8:05 ` H. Peter Anvin
2004-02-17 14:25 ` Dave Kleikamp
2004-02-18 0:16 ` Robert White
2004-02-18 0:20 ` Linus Torvalds
2004-02-18 1:03 ` Robert White
2004-02-18 21:48 ` Ville Herva
2004-02-18 2:48 ` tridge
2004-02-18 20:56 ` Robert White
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