[GIT PULL] renameat2 syscall

[Miklos Szeredi]

Hi Linus,

I think I addressed all issues with this series:

 - i_mutex on non-directories being moved needed for NFS
 - split ext4_rename() into cross-rename/plain-rename functions
 - split i_op->rename(), it's certainly easier to maintain pre merge, then we'll
   see
 - xfstests validation added
 - whiteout patch added (but not in this pull)

Please pull from:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git cross-rename

Thanks,
Miklos
---

This series adds a new syscall, renameat2(), which is the same as renameat() but
with a flags argument.

The purpose of extending rename is to add cross-rename, a symmetric variant of
rename, which exchanges the two files.  This allows interesting things, which
were not possible before, for example atomically replacing a directory tree with
a symlink, etc...  This also allows overlayfs and friends to operate on
whiteouts atomically.

Andy Lutomirski also suggested a "noreplace" flag, which disables the
overwriting behavior of rename.

These two flags, RENAME_EXCHANGE and RENAME_NOREPLACE are only implemented for
ext4 as an example and for testing.
---

J. Bruce Fields (1):
      vfs: lock_two_nondirectories: allow directory args

Miklos Szeredi (11):
      vfs: add d_is_dir()
      vfs: rename: move d_move() up
      vfs: rename: use common code for dir and non-dir
      vfs: add renameat2 syscall
      vfs: add RENAME_NOREPLACE flag
      security: add flags to rename hooks
      vfs: add cross-rename
      ext4: rename: create ext4_renament structure for local vars
      ext4: rename: move EMLINK check up
      ext4: rename: split out helper functions
      ext4: add cross rename support

---
 Documentation/filesystems/Locking                  |   6 +-
 Documentation/filesystems/vfs.txt                  |  16 +
 arch/x86/syscalls/syscall_64.tbl                   |   1 +
 .../lustre/lustre/include/linux/lustre_compat25.h  |   4 +-
 drivers/staging/lustre/lustre/lvfs/lvfs_linux.c    |   2 +-
 fs/cachefiles/namei.c                              |   4 +-
 fs/dcache.c                                        |  50 ++-
 fs/ecryptfs/inode.c                                |   2 +-
 fs/ext4/namei.c                                    | 480 +++++++++++++++------
 fs/inode.c                                         |  25 +-
 fs/namei.c                                         | 315 +++++++-------
 fs/nfsd/vfs.c                                      |   2 +-
 include/linux/dcache.h                             |   8 +-
 include/linux/fs.h                                 |   4 +-
 include/linux/security.h                           |  12 +-
 include/uapi/linux/fs.h                            |   3 +
 security/security.c                                |  22 +-
 17 files changed, 643 insertions(+), 313 deletions(-)
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