[GIT PULL] overlayfs update for 4.9

[Miklos Szeredi]

Hi Al,

Please pull from:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-viro

This has an assortment of fixes and cleanups for overlayfs.

It also touches the VFS:

 - add the vfs_get_link() helper for calling i_op->get_link();
 - fix mnt_want_write_file() to freeze protect the underlying sb instead of
   overlay sb;
 - allow vfs_clone_file_range() to be called by overlayfs.

None of the above should have any effect on filesystems other than overlayfs.

Thanks,
Miklos

---
Amir Goldstein (3):
      vfs: allow vfs_clone_file_range() across mount points
      vfs: call vfs_clone_file_range() under mnt_want_write()
      ovl: use vfs_clone_file_range() for copy up if possible

Miklos Szeredi (8):
      ovl: copy_up_xattr(): use strnlen
      ovl: lookup: do getxattr with mounter's permission
      vfs: mnt_want_write_file() should freeze protect underlying sb
      ovl: make directory ino/dev numbers stable
      ovl: explain error values when removing acl from workdir
      ovl: use generic_readlink
      vfs: add vfs_get_link() helper
      ovl: use vfs_get_link()

Richard Weinberger (1):
      ovl: Fix info leak in ovl_lookup_temp()

Vivek Goyal (1):
      ovl: during copy up, switch to mounter's creds early

---
 fs/ioctl.c             |  5 +++-
 fs/namei.c             | 25 +++++++++++++++++
 fs/namespace.c         |  7 +++--
 fs/nfsd/vfs.c          |  3 +-
 fs/open.c              | 15 +++++-----
 fs/overlayfs/copy_up.c | 75 +++++++++++++++++++-------------------------------
 fs/overlayfs/dir.c     | 32 +++++++++++++++++++--
 fs/overlayfs/inode.c   | 44 +++++++----------------------
 fs/overlayfs/super.c   | 33 ++++++++++++++--------
 fs/read_write.c        | 13 ++++-----
 fs/xattr.c             | 13 ++++++---
 include/linux/fs.h     | 14 ++++++++++
 12 files changed, 160 insertions(+), 119 deletions(-)