New code for 5.6:

- Get rid of compat_time_t
- Convert time_t to time64_t in quota code
- Remove shadow variables
- Prevent ATTR_ flag misuse in the attrmulti ioctls
- Clean out strlen in the attr code
- Remove some bogus asserts
- Fix various file size limit calculation errors with 32-bit kernels
- Pack xfs_dir2_sf_entry_t to fix build errors on arm oabi
- Fix nowait inode locking calls for directio aio reads.
- Fix memory corruption bugs when invalidating remote xattr value
  buffers.
- Streamline remote attr value removal.
- Make the buffer log format size consistent across platforms.
- Strengthen buffer log format size checking.
- Fix messed up return types of xfs_inode_need_cow.
- Fix some unused variable warnings.
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