vfs.git, part 4 - copy_file_range stuff

Several series around copy_file_range/CLONE. Please, pull from

git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.copy_file_range

Shortlog:
Anna Schumaker (2):
vfs: Add vfs_copy_file_range() support for pagecache copies
nfsd: Pass filehandle to nfs4_preprocess_stateid_op()

Arnd Bergmann (1):
cifs: avoid unused variable and label

Christoph Hellwig (3):
locks: new locks_mandatory_area calling convention
vfs: pull btrfs clone API to vfs layer
nfsd: implement the NFSv4.2 CLONE operation

Darrick J. Wong (3):
vfs: wire up compat ioctl for CLONE/CLONE_RANGE
vfs: hoist the btrfs deduplication ioctl to the vfs
btrfs: use new dedupe data function pointer

Zach Brown (3):
vfs: add copy_file_range syscall and vfs helper
x86: add sys_copy_file_range to syscall tables
btrfs: add .copy_file_range file operation

Diffstat:

 arch/x86/entry/syscalls/syscall_32.tbl |   1 +
 arch/x86/entry/syscalls/syscall_64.tbl |   1 +
 fs/btrfs/ctree.h                       |   8 +-
 fs/btrfs/file.c                        |   3 +
 fs/btrfs/ioctl.c                       | 186 ++++----------------
 fs/cifs/cifsfs.c                       |  61 +++++++
 fs/cifs/cifsfs.h                       |   1 -
 fs/cifs/ioctl.c                        | 126 +++++++-------
 fs/compat_ioctl.c                      |   5 +
 fs/ioctl.c                             |  67 ++++++++
 fs/locks.c                             |  22 +--
 fs/nfs/nfs4file.c                      |  87 ++--------
 fs/nfsd/nfs4proc.c                     |  63 ++++++-
 fs/nfsd/nfs4state.c                    |   5 +-
 fs/nfsd/nfs4xdr.c                      |  21 +++
 fs/nfsd/state.h                        |   4 +-
 fs/nfsd/vfs.c                          |   8 +
 fs/nfsd/vfs.h                          |   2 +
 fs/nfsd/xdr4.h                         |  10 ++
 fs/read_write.c                        | 302 ++++++++++++++++++++++++++++++++-
 include/linux/fs.h                     |  42 +++--
 include/linux/nfs4.h                   |   4 +-
 include/linux/syscalls.h               |   3 +
 include/uapi/asm-generic/unistd.h      |   4 +-
 include/uapi/linux/fs.h                |  39 +++++
 kernel/sys_ni.c                        |   1 +
 26 files changed, 733 insertions(+), 343 deletions(-)