Re: [RFC 0/5] NFS Server Side Copy

[Bryan Schumaker <bjschuma@netapp.com>]

On 07/22/2013 02:53 PM, J. Bruce Fields wrote:
> On Fri, Jul 19, 2013 at 05:03:45PM -0400, bjschuma@netapp.com wrote:
>> From: Bryan Schumaker <bjschuma@netapp.com>
>>
>> These patches build on Zach Brown's copyfile patches to add server side
>> copy to both the NFS client and the NFS server.
>>
>> The first patch improves on the copyfile syscall to make it usable on my
>> machine and also includes notes on other potential problems that I've
>> found.  The remaining patches first implement a sync copy, then expand to
>> async.
>>
>> My testing was done on a server exporting an ext4 filesystem exporting an
>> ext4 filesystem.  I compared copying using the cp command to copying with
>> the copyfile system call.
> 
> Were these tests using the full series of patches?  (So, using the
> asynchronous mechanism?)

Yes.  Want me to re-run them without it?

- Bryan

> 
> --b.
> 
>>
>>
>> File size:  512 MB
>> cp: 4.244 seconds
>> copyfile: 0.961 seconds
>>
>> File size: 1024 MB
>> cp: 9.091 seconds
>> copyfile: 1.919 seconds
>>
>> File size: 1536 MB
>> cp: 15.291 seconds
>> copyfile: 6.016 seconds
>>
>>
>> Repeating these tests on a btrfs exported filesystem supporting the copyfile
>> system call drops the time for copyfile to about 0.01 seconds.
>>
>> Feel free to send me any questions, comments or other thoughts!
>>
>> - Bryan
>>
>> Bryan Schumaker (5):
>>   Improve on the copyfile systemcall
>>   NFSD: Implement the COPY call
>>   NFS: Add COPY nfs operation
>>   NFSD: Defer copying
>>   NFS: Change copy to support async servers
>>
>>  fs/copy_range.c          |  10 +++-
>>  fs/nfs/callback.h        |  13 ++++
>>  fs/nfs/callback_proc.c   |   9 +++
>>  fs/nfs/callback_xdr.c    |  54 ++++++++++++++++-
>>  fs/nfs/inode.c           |   2 +
>>  fs/nfs/nfs4_fs.h         |   7 +++
>>  fs/nfs/nfs4file.c        | 101 +++++++++++++++++++++++++++++++
>>  fs/nfs/nfs4proc.c        |  16 +++++
>>  fs/nfs/nfs4xdr.c         | 150 +++++++++++++++++++++++++++++++++++++++++++++++
>>  fs/nfsd/nfs4callback.c   | 136 ++++++++++++++++++++++++++++++++++++++++++
>>  fs/nfsd/nfs4proc.c       | 104 ++++++++++++++++++++++++++++++--
>>  fs/nfsd/nfs4state.c      |  15 ++++-
>>  fs/nfsd/nfs4xdr.c        | 121 +++++++++++++++++++++++++++++++++++++-
>>  fs/nfsd/state.h          |  23 +++++++-
>>  fs/nfsd/vfs.c            |   9 +++
>>  fs/nfsd/vfs.h            |   1 +
>>  fs/nfsd/xdr4.h           |  24 ++++++++
>>  fs/nfsd/xdr4cb.h         |   9 +++
>>  include/linux/nfs4.h     |  14 ++++-
>>  include/linux/nfs_xdr.h  |  33 +++++++++++
>>  include/linux/syscalls.h |   1 +
>>  21 files changed, 836 insertions(+), 16 deletions(-)
>>
>> -- 
>> 1.8.3.3
>>
>> --
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