Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Fix race in ext4_inode_info.i_cached_extent
  ext4: Clear the unwritten buffer_head flag after the extent is initialized
  ext4: Use a fake block number for delayed new buffer_head
  ext4: Fix sub-block zeroing for writes into preallocated extents