Sync with SLE12-SP3 kernel submission.

- xfs: fix xfs_mode_to_ftype() prototype (bsc#1043598).
- commit c745736

- kABI: protect struct xlog (bsc#1043598).
- commit 5e564d7

- xfs: log recovery tracepoints to track current lsn and buffer
submission (bsc#1043598).
- xfs: update metadata LSN in buffers during log recovery
(bsc#1043598).
- xfs: don't warn on buffers not being recovered due to LSN
(bsc#1043598).
- xfs: pass current lsn to log recovery buffer validation
(bsc#1043598).
- xfs: rework log recovery to submit buffers on LSN boundaries
(bsc#1043598).
- xfs: refactor log record unpack and data processing
(bsc#1043598).
- commit 573d2cf

- xfs: sanity check inode di_mode (bsc#1042421).
- xfs: replace xfs_mode_to_ftype table with switch statement
(bsc#1042421).
- xfs: add missing include dependencies to xfs_dir2.h
(bsc#1042421).
- xfs: rework the inline directory verifiers (bsc#1042421).
- xfs: verify inline directory data forks (bsc#1042421).
- commit b14549f

- raid5-ppl: use a single mempool for ppl_io_unit and header_page