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 v7: --- in VFS patch: remove the support for generic copy_file_range for all file systems, just allow for individual filesystems to support cross device copy_file_range. the check for the superblocks is moved just before the do_splice_direct() --- modified the man page Olga Kornievskaia (11): 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 | 12 ++- include/linux/nfs4.h | 25 +++++ include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 17 ++++ 16 files changed, 539 insertions(+), 24 deletions(-) -- 1.8.3.1
