From: Olga Kornievskaia <kolga@xxxxxxxxxx>
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() to
represent an open.
Also this particular open is marked (NFS_SVC_SSC_COPY_STATE) so
that if the destination server ever to receive stateid errors on
this stateid, it knows not to initiate state recovery (in case
when source server reboots). The recovery must be done by the
client and a new copy must be initiated. Therefore, in this case
the recovery needs to fail with EIO.
v6:
-- in the VFS patches: made suggested changes to first allow cross
device copy for all filesystem via do_splice, still checking
superblocks for clone/copy_file_range. in the 2nd patch allow
individual copy_file_range to deal with cross device support.
-- fixes NFS cross file system check as per Matthew comments.
Olga Kornievskaia (12):
VFS: generic cross-device copy_file_range() support for all
filesystems
VFS: move cross device copy_file_range() check into filesystems
NFS: validity check for source offset in copy_file_range
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: replace cross device check in copy_file_range
Documentation/filesystems/porting | 7 ++
fs/cifs/cifsfs.c | 3 +
fs/nfs/nfs42.h | 15 ++-
fs/nfs/nfs42proc.c | 129 ++++++++++++++++++++++---
fs/nfs/nfs42xdr.c | 193 +++++++++++++++++++++++++++++++++++++-
fs/nfs/nfs4_fs.h | 10 ++
fs/nfs/nfs4client.c | 2 +-
fs/nfs/nfs4file.c | 125 +++++++++++++++++++++++-
fs/nfs/nfs4proc.c | 6 +-
fs/nfs/nfs4state.c | 14 +++
fs/nfs/nfs4xdr.c | 1 +
fs/overlayfs/file.c | 3 +
fs/read_write.c | 9 +-
include/linux/nfs4.h | 25 +++++
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 17 ++++
16 files changed, 535 insertions(+), 25 deletions(-)
--
1.8.3.1
