[PATCH v2 0/2][Xenial SRU] Fix docker permission issues with the overlay2 storage driver

[Seth Forshee]

BugLink: http://bugs.launchpad.net/bugs/1659417

Under some conditions docker users who use the overlay2 storage driver
on xenial are seeing erroneous "permission denied" errors. This is
caused by a bug in overlayfs which was fixed by two commits in 4.6. The
following are backports of those patches to xenial.

Changes in v2: Fix locking

Thanks,
Seth

Miklos Szeredi (2):
  vfs: add lookup_hash() helper
  ovl: ignore permissions on underlying lookup

 fs/namei.c            | 26 ++++++++++++++++++++++++++
 fs/overlayfs/super.c  |  4 +---
 include/linux/namei.h |  2 ++
 3 files changed, 29 insertions(+), 3 deletions(-)