[GIT PULL] overlayfs fixes for 4.9-rc3

[Miklos Szeredi]

Hi Linus,

Please pull from:

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

Fix two more POSIX ACL bugs introduced in 4.8 and add a missing fsync during
copy up to prevent possible data loss.

Also introduce the concept of feature flags to allow backward incompatible
changes to the overlay format.  This should have been there from day one; the
best we can do now is backport to stable kernels.  Add the check for features
without adding any actual features yet.

Thanks,
Miklos

---
Miklos Szeredi (4):
      ovl: update S_ISGID when setting posix ACLs
      ovl: fix get_acl() on tmpfs
      ovl: fsync after copy-up
      ovl: check fs features

---
 Documentation/filesystems/overlayfs.txt | 12 +++++++
 fs/overlayfs/copy_up.c                  |  2 ++
 fs/overlayfs/inode.c                    |  3 --
 fs/overlayfs/overlayfs.h                |  1 +
 fs/overlayfs/super.c                    | 56 +++++++++++++++++++++++++++++++++
 5 files changed, 71 insertions(+), 3 deletions(-)