A few more patches that were Cc'd stable but failed to apply to 3.18, backported with the 4.4 queue variants as reference wherever required.
Patch series respun based off 3.18.106 with Michal Hocko's feedback integrated.
[0] https://www.spinics.net/lists/stable/msg236795.html
Matthew Wilcox (1): mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
Theodore Ts'o (2): ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea() ext4: don't update checksum of new initialized bitmaps
wangguang (1): ext4: bugfix for mmaped pages in mpage_release_unused_pages()
fs/ext4/balloc.c | 3 +-- fs/ext4/ialloc.c | 43 +++---------------------------- fs/ext4/inline.c | 66 ++++++++++++++++++++++-------------------------- fs/ext4/inode.c | 4 ++- fs/ext4/xattr.c | 30 +++++++++------------- fs/ext4/xattr.h | 32 +++++++++++++++++++++++ mm/filemap.c | 4 +-- 7 files changed, 83 insertions(+), 99 deletions(-)