From: Hellwig Christoph <hch@infradead.org>
To: "Myklebust, Trond" <Trond.Myklebust@netapp.com>
Cc: Hellwig Christoph <hch@infradead.org>,
"Schumaker, Bryan" <Bryan.Schumaker@netapp.com>,
Mailing List Linux NFS <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH 2/3] NFS: Allow for asynchronous WRITE_PLUS calls
Date: Tue, 29 Oct 2013 05:48:36 -0700 [thread overview]
Message-ID: <20131029124836.GA13482@infradead.org> (raw)
In-Reply-To: <BF996CAD-1032-4434-A538-B678D047884B@netapp.com>
On Tue, Oct 29, 2013 at 12:44:50PM +0000, Myklebust, Trond wrote:
> It exists because the server vendors were worried that operations such as preallocation and/or hole punching can take a more or less unbounded amount of time due to the 64-bit size. By using an (optional) callback method, the server can free up the RPC slot that would otherwise be kept waiting in the synchronous case.
Must be some horried filesystems on those vendors servers. Both
operations should be O(nr_extents), where nr_extents should be extremely
low for the preallocation and still reasonably low for hole punches,
although users control the allocastion pattern.
There's a reason why these aren't aio operations locally either.
next prev parent reply other threads:[~2013-10-29 12:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-28 15:00 [PATCH 0/3] NFS: Add support for fallocate and llseek Anna Schumaker
2013-10-28 15:00 ` [PATCH 1/3] NFS: Use WRITE_PLUS for hole punches Anna Schumaker
2013-10-29 7:39 ` Christoph Hellwig
2013-10-29 12:41 ` Anna Schumaker
2013-11-05 9:37 ` Christoph Hellwig
2013-10-28 15:00 ` [PATCH 2/3] NFS: Allow for asynchronous WRITE_PLUS calls Anna Schumaker
2013-10-29 7:39 ` Christoph Hellwig
2013-10-29 12:44 ` Myklebust, Trond
2013-10-29 12:48 ` Hellwig Christoph [this message]
2013-10-29 13:05 ` Myklebust, Trond
2013-10-29 13:08 ` Hellwig Christoph
2013-10-29 13:21 ` Myklebust, Trond
2013-10-29 13:24 ` Hellwig Christoph
2013-10-29 13:41 ` Myklebust, Trond
2013-10-29 13:44 ` J. Bruce Fields
2013-10-28 15:00 ` [PATCH 3/3] NFS: Implement SEEK Anna Schumaker
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