For IPU, there is no need to read dnode, these three patches are to fix this
issue.

patch 1): Reconstruct code in do_write_data_page, code logic stays unchanged,
patch 2): Under high-probability IPU scenario, we check extent_tree first
patch 3): Unlock dnode before IPU

Hou Pengyang (3):
  f2fs: reconstruct code to write a data page
  f2fs: lookup extent cache first under IPU scenario
  f2fs: unlock dnode before IPU

 fs/f2fs/data.c | 94 ++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 72 insertions(+), 22 deletions(-)

-- 
2.10.1


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