From: Christoph Hellwig <hch@infradead.org>
To: Steven Whitehouse <swhiteho@redhat.com>
Cc: Andreas Dilger <adilger@clusterfs.com>,
linux-fsdevel@vger.kernel.org, Gary Grider <ggrider@lanl.gov>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: NFSv4/pNFS possible POSIX I/O API standards
Date: Thu, 30 Nov 2006 12:29:50 +0000 [thread overview]
Message-ID: <20061130122950.GA28757@infradead.org> (raw)
In-Reply-To: <1164795907.3752.58.camel@quoit.chygwyn.com>
On Wed, Nov 29, 2006 at 10:25:07AM +0000, Steven Whitehouse wrote:
> I agree that this is a good plan, but I'd been looking at this idea from
> a different direction recently. The in kernel NFS server calls
> vfs_getattr from its filldir routine for readdirplus and this means not
> only are we unable to optimise performance by (for example) sorting
> groups of getattr calls so that we read the inodes in disk block order,
> but also that its effectively enforcing a locking order of the inodes on
> us too. Since we can have async locking in GFS2, we should be able to do
> "lockahead" with readdirplus too.
>
> I had been considering proposing a readdirplus export operation, but
> since this thread has come up, perhaps a file operation would be
> preferable as it could solve two problems with one operation?
Doing this as an export operation is wrong. Even if it's only used
for nfsd for now the logical level this should be on are the file operations.
If you do it you could probably prototype a syscall for it aswell - once
we have the infrastructure the syscall should be no more than about 20
lines of code.
next prev parent reply other threads:[~2006-11-30 12:29 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-28 4:34 NFSv4/pNFS possible POSIX I/O API standards Gary Grider
2006-11-28 5:54 ` Christoph Hellwig
2006-11-28 10:54 ` Andreas Dilger
2006-11-28 11:28 ` Anton Altaparmakov
2006-11-28 20:17 ` Russell Cattelan
2006-11-28 23:28 ` Wendy Cheng
2006-11-29 9:12 ` Christoph Hellwig
2006-11-29 9:04 ` Christoph Hellwig
2006-11-29 9:14 ` Christoph Hellwig
2006-11-29 9:48 ` Andreas Dilger
2006-11-29 10:18 ` Anton Altaparmakov
2006-11-29 8:26 ` Brad Boyer
2006-11-30 9:25 ` Christoph Hellwig
2006-11-30 17:49 ` Sage Weil
2006-12-01 5:26 ` Trond Myklebust
2006-12-01 7:08 ` Sage Weil
2006-12-01 14:41 ` Trond Myklebust
2006-12-01 16:47 ` Sage Weil
2006-12-01 18:07 ` Trond Myklebust
2006-12-01 18:42 ` Sage Weil
2006-12-01 19:13 ` Trond Myklebust
2006-12-01 20:32 ` Sage Weil
2006-12-04 18:02 ` Peter Staubach
2006-12-05 23:20 ` readdirplus() as possible POSIX I/O API Sage Weil
2006-12-06 15:48 ` Peter Staubach
2006-12-03 1:57 ` NFSv4/pNFS possible POSIX I/O API standards Andreas Dilger
2006-12-03 7:34 ` Kari Hurtta
2006-12-03 1:52 ` Andreas Dilger
2006-12-03 16:10 ` Sage Weil
2006-12-04 7:32 ` Andreas Dilger
2006-12-04 15:15 ` Trond Myklebust
2006-12-05 0:59 ` Rob Ross
2006-12-05 4:44 ` Gary Grider
2006-12-05 10:05 ` Christoph Hellwig
2006-12-05 5:56 ` Trond Myklebust
2006-12-05 10:07 ` Christoph Hellwig
2006-12-05 14:20 ` Matthew Wilcox
2006-12-06 15:04 ` Rob Ross
2006-12-06 15:44 ` Matthew Wilcox
2006-12-06 16:15 ` Rob Ross
2006-12-05 14:55 ` Trond Myklebust
2006-12-05 22:11 ` Rob Ross
2006-12-05 23:24 ` Trond Myklebust
2006-12-06 16:42 ` Rob Ross
2006-12-06 12:22 ` Ragnar Kjørstad
2006-12-06 15:14 ` Trond Myklebust
2006-12-05 16:55 ` Latchesar Ionkov
2006-12-05 22:12 ` Christoph Hellwig
2006-12-06 23:12 ` Latchesar Ionkov
2006-12-06 23:33 ` Trond Myklebust
2006-12-05 21:50 ` Rob Ross
2006-12-05 22:05 ` Christoph Hellwig
2006-12-05 23:18 ` Sage Weil
2006-12-05 23:55 ` Ulrich Drepper
2006-12-06 10:06 ` Andreas Dilger
2006-12-06 17:19 ` Ulrich Drepper
2006-12-06 17:27 ` Rob Ross
2006-12-06 17:42 ` Ulrich Drepper
2006-12-06 18:01 ` Ragnar Kjørstad
2006-12-06 18:13 ` Ulrich Drepper
2006-12-17 14:41 ` Ragnar Kjørstad
2006-12-17 19:07 ` Ulrich Drepper
2006-12-17 19:38 ` Matthew Wilcox
2006-12-17 21:51 ` Ulrich Drepper
2006-12-18 2:57 ` Ragnar Kjørstad
2006-12-18 3:54 ` Gary Grider
2006-12-07 5:57 ` Andreas Dilger
2006-12-15 22:37 ` Ulrich Drepper
2006-12-16 18:13 ` Andreas Dilger
2006-12-16 19:08 ` Ulrich Drepper
2006-12-14 23:58 ` statlite() Rob Ross
2006-12-07 23:39 ` NFSv4/pNFS possible POSIX I/O API standards Nikita Danilov
2006-12-05 14:37 ` Peter Staubach
2006-12-05 10:26 ` readdirplus() as possible POSIX I/O API Andreas Dilger
2006-12-05 15:23 ` Trond Myklebust
2006-12-06 10:28 ` Andreas Dilger
2006-12-06 15:10 ` Trond Myklebust
2006-12-05 17:06 ` Latchesar Ionkov
2006-12-05 22:48 ` Rob Ross
2006-11-29 10:25 ` NFSv4/pNFS possible POSIX I/O API standards Steven Whitehouse
2006-11-30 12:29 ` Christoph Hellwig [this message]
2006-12-01 15:52 ` Ric Wheeler
2006-11-29 12:23 ` Matthew Wilcox
2006-11-29 12:35 ` Matthew Wilcox
2006-11-29 16:26 ` Gary Grider
2006-11-29 17:18 ` Christoph Hellwig
2006-11-29 12:39 ` Christoph Hellwig
2006-12-01 22:29 ` Rob Ross
2006-12-02 2:35 ` Latchesar Ionkov
2006-12-05 0:37 ` Rob Ross
2006-12-05 10:02 ` Christoph Hellwig
2006-12-05 16:47 ` Latchesar Ionkov
2006-12-05 17:01 ` Matthew Wilcox
[not found] ` <f158dc670612050909m366594c5ubaa87d9a9ecc8c2a@mail.gmail.com>
2006-12-05 17:10 ` Latchesar Ionkov
2006-12-05 17:39 ` Matthew Wilcox
2006-12-05 21:55 ` Rob Ross
2006-12-05 21:50 ` Peter Staubach
2006-12-05 21:44 ` Rob Ross
2006-12-06 11:01 ` openg Christoph Hellwig
2006-12-06 15:41 ` openg Trond Myklebust
2006-12-06 15:42 ` openg Rob Ross
2006-12-06 23:32 ` openg Christoph Hellwig
2006-12-14 23:36 ` openg Rob Ross
2006-12-06 23:25 ` Re: NFSv4/pNFS possible POSIX I/O API standards Latchesar Ionkov
2006-12-06 9:48 ` David Chinner
2006-12-06 15:53 ` openg and path_to_handle Rob Ross
2006-12-06 16:04 ` Matthew Wilcox
2006-12-06 16:20 ` Rob Ross
2006-12-06 20:57 ` David Chinner
2006-12-06 20:40 ` David Chinner
2006-12-06 20:50 ` Matthew Wilcox
2006-12-06 21:09 ` David Chinner
2006-12-06 22:09 ` Andreas Dilger
2006-12-06 22:17 ` Matthew Wilcox
2006-12-06 22:41 ` Andreas Dilger
2006-12-06 23:39 ` Christoph Hellwig
2006-12-14 22:52 ` Rob Ross
2006-12-06 20:50 ` Rob Ross
2006-12-06 21:01 ` David Chinner
2006-12-06 23:19 ` Latchesar Ionkov
2006-12-14 21:00 ` Rob Ross
2006-12-14 21:20 ` Matthew Wilcox
2006-12-14 23:02 ` Rob Ross
2006-11-28 15:08 ` NFSv4/pNFS possible POSIX I/O API standards Matthew Wilcox
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