Messages in this thread | | | From | "Myklebust, Trond" <> | Subject | Re: [RFC v0 4/4] nfs, nfsd: rough sys_copy_range and COPY support | Date | Wed, 15 May 2013 20:21:54 +0000 |
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On Wed, 2013-05-15 at 16:19 -0400, J. Bruce Fields wrote: > On Tue, May 14, 2013 at 02:15:26PM -0700, Zach Brown wrote: > > This crude patch illustrates the simplest plumbing involved in > > supporting sys_call_range with the NFS COPY operation that's pending in > > the 4.2 draft spec. > > > > The patch is based on a previous prototype that used the COPY op to > > implement sys_copyfileat which created a new file (based on the ocfs2 > > reflink ioctl). By contrast, this copies file contents between existing > > files. > > > > There's still a lot of implementation and testing to do, but this can > > get discussion going. > > I'm using: > > git://github.com/loghyr/NFSv4.2 > > as my reference for the draft protocol. > > On a quick skim, one thing this is missing before it complies is a > client implementation of CB_OFFLOAD: "If a client desires an > intra-server file copy, then it MUST support the COPY and CB_OFFLOAD > operations."
Note that Bryan is currently working on updating the NFS implementation to match the draft protocol.
-- Trond Myklebust Linux NFS client maintainer
NetApp Trond.Myklebust@netapp.com www.netapp.com
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