mbox series

[v9,00/11] client-side support for "inter" SSC copy

Message ID 20190614200016.12348-1-olga.kornievskaia@gmail.com (mailing list archive)
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Series client-side support for "inter" SSC copy | expand

Message

Olga Kornievskaia June 14, 2019, 8 p.m. UTC 
From: Olga Kornievskaia <kolga@netapp.com>

This patch series adds client-side support for doing NFSv4.2 "inter"
copy offload between different NFS servers.

In case of the "inter" SSC copy files reside on different servers and
thus under different superblocks and require that VFS removes the
restriction that src and dst files must be on the same superblock.

NFS's copy_file_range() determines if the copy is "intra" or "inter"
and for "inter" it sends the COPY_NOTIFY to the source server. Then,
it would send of an asynchronous COPY to the destination server. If
an application cancels an in-flight COPY, OFFLOAD_CANCEL is sent to
both of the servers.

This patch series also include necessary client-side additions that
are performed by the destination server. The server needs an NFS
open that represents a source file without doing an actual open.
Two function nfs42_ssc_open/nfs42_ssc_close() are introduced to
accomplish it that make use of the VFS's alloc_file_pseudo().

This patch series depends on removal of the cross-device check which
was done in Amir's VFS generic copy_file_range support.

v9:
--- reworked reboot recovery for the source server. previously copies
were stored on the destination's server structure list, but when source
server reboots it can't wake up the waiting copies to be redone. Instead
now add the copy to both the source server and the destination server so
that during recovery we can find it on either of the servers' lists.
--- when a source server rebooted and the destination server wasn't able
to read any bytes and in the callback it returns NFS4ERR_PARTNER_NO_AUTH
with 0 bytes, treat that as source server reboot.

Olga Kornievskaia (11):
  NFS NFSD: defining nl4_servers structure needed by both
  NFS: add COPY_NOTIFY operation
  NFS: add ca_source_server<> to COPY
  NFS: also send OFFLOAD_CANCEL to source server
  NFS: inter ssc open
  NFS: skip recovery of copy open on dest server
  NFS: for "inter" copy treat ESTALE as ENOTSUPP
  NFS: COPY handle ERR_OFFLOAD_DENIED
  NFS handle NFS4ERR_PARTNER_NO_AUTH error
  NFS: handle source server reboot
  NFS: replace cross device check in copy_file_range

 fs/nfs/nfs42.h            |  15 +++-
 fs/nfs/nfs42proc.c        | 193 +++++++++++++++++++++++++++++++++++++++-------
 fs/nfs/nfs42xdr.c         | 190 ++++++++++++++++++++++++++++++++++++++++++++-
 fs/nfs/nfs4_fs.h          |  11 +++
 fs/nfs/nfs4client.c       |   2 +-
 fs/nfs/nfs4file.c         | 125 +++++++++++++++++++++++++++++-
 fs/nfs/nfs4proc.c         |   7 +-
 fs/nfs/nfs4state.c        |  40 ++++++++--
 fs/nfs/nfs4xdr.c          |   1 +
 include/linux/nfs4.h      |  25 ++++++
 include/linux/nfs_fs.h    |   4 +-
 include/linux/nfs_fs_sb.h |   1 +
 include/linux/nfs_xdr.h   |  17 ++++
 13 files changed, 586 insertions(+), 45 deletions(-)