Some low-hanging cleanup fruit. The argument bloat-o-meter shows some
improvements:

extent_io.c:cache_state_if_flags.part.27       -8 (8 -> 0)
extent_io.c:cache_state.part.28                -8 (8 -> 0)
extent_io.c:check_buffer_tree_ref.part.31     -24 (24 -> 0)
extent_io.c:mark_extent_buffer_accessed        -8 (40 -> 32)
extent_io.c:alloc_extent_state_atomic.part.35  -8 (8 -> 0)
extent_io.c:flush_write_bio.isra.40           -16 (16 -> 0)
extent_io.c:set_page_extent_mapped.part.49     -8 (8 -> 0)
extent_io.c:extent_buffer_under_io.part.50     -8 (8 -> 0)
extent_io.c:__unlock_for_delalloc.isra.38      -8 (8 -> 0)
extent_io.c:merge_state.part.45               -48 (48 -> 0)
extent_io.c:repair_eb_io_failure               -8 (72 -> 64)
extent_io.c:set_extent_buffer_dirty            -8 (40 -> 32)
extent_io.c:__alloc_dummy_extent_buffer        +8 (32 -> 40)
extent_io.c:write_one_eb                      +16 (152 -> 168)

David Sterba (3):
  btrfs: simplify counting number of eb pages
  btrfs: pass only eb to num_extent_pages
  btrfs: switch types to int when counting eb pages

 fs/btrfs/extent_io.c | 68 ++++++++++++++++++++++++++--------------------------
 fs/btrfs/extent_io.h |  5 ++--
 2 files changed, 36 insertions(+), 37 deletions(-)

-- 
2.16.2

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