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From: Ric Wheeler <ricwheeler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-fsdevel
	<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Hannes Reinecke <hare-l3A5Bk7waGM@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Joel Becker <jlbec-aKy9MeLSZ9dg9hUCZPvPmw@public.gmane.org>,
	James Bottomley
	<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
Subject: copy offload support in Linux - new system call needed?
Date: Wed, 14 Dec 2011 14:22:07 -0500	[thread overview]
Message-ID: <4EE8F75F.6070800@gmail.com> (raw)


Back at LinuxCon Prague, we talked about the new NFS and SCSI commands that let 
us offload copy operations to a storage device (like an NFS server or storage 
array).

This got new life in the virtual machine world where you might want to clone 
bulky guest files or ranges of blocks and was driven through the standards 
bodies by vmware, microsoft and some of the major storage vendors. Windows8 has 
this functionality fully coded and integrated in the GUI, I assume vmware also 
uses it and there are some vendors who announced support at the SNIA SDC conference.

We had an active thread a couple of years back that came out of the reflink work 
and, at the time, there seemed to be moderately positive support for adding a 
new system call that would fit this use case (Joel Becker's copyfile()).

Can we resurrect this effort? Is copyfile() still a good way to go, or should we 
look at other hooks?

Thanks!

Ric



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             reply	other threads:[~2011-12-14 19:22 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-14 19:22 Ric Wheeler [this message]
2011-12-14 19:27 ` copy offload support in Linux - new system call needed? Al Viro
     [not found]   ` <20111214192739.GN2203-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2011-12-14 19:42     ` Ric Wheeler
     [not found]       ` <4EE8FC2E.3010207-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-12-14 22:27         ` J. Bruce Fields
2011-12-15 14:59           ` Trond Myklebust
2011-12-15 15:52             ` Chris Mason
2011-12-15 16:00               ` Trond Myklebust
2011-12-15 16:03               ` Jeff Layton
     [not found]                 ` <20111215110330.33aed3a6-xSBYVWDuneFaJnirhKH9O4GKTjYczspe@public.gmane.org>
2011-12-15 16:06                   ` Trond Myklebust
     [not found]                     ` <1323965176.14317.11.camel-SyLVLa/KEI9HwK5hSS5vWB2eb7JE58TQ@public.gmane.org>
2011-12-15 16:16                       ` Jeff Layton
2011-12-15 16:38                         ` Trond Myklebust
2011-12-15 16:08             ` Loke, Chetan
     [not found]               ` <D3F292ADF945FB49B35E96C94C2061B91516E391-2s2rCY1e8UXHBhWB4kaBDUEOCMrvLtNR@public.gmane.org>
2011-12-15 16:11                 ` Trond Myklebust
2011-12-15 16:40                   ` Loke, Chetan
2011-12-15 16:53                     ` Trond Myklebust
     [not found]                       ` <1323968015.14317.28.camel-SyLVLa/KEI9HwK5hSS5vWB2eb7JE58TQ@public.gmane.org>
2011-12-15 17:18                         ` Ric Wheeler
2011-12-15 17:25                           ` Trond Myklebust
2011-12-15 17:31                           ` Loke, Chetan
2011-12-15 17:55                             ` Ric Wheeler
2011-12-15 17:27                         ` Loke, Chetan
     [not found]             ` <1323961140.14317.2.camel-SyLVLa/KEI9HwK5hSS5vWB2eb7JE58TQ@public.gmane.org>
2011-12-15 17:44               ` J. Bruce Fields
2011-12-16  8:00       ` Joel Becker
2011-12-14 19:59 ` Jeremy Allison
2011-12-14 20:30   ` Ric Wheeler
2011-12-19 12:38     ` Hannes Reinecke
2011-12-19 22:19   ` H. Peter Anvin
2011-12-19 22:34     ` Jeremy Allison
2011-12-19 22:57     ` Dave Chinner
2011-12-19 23:29       ` H. Peter Anvin

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