cleanup AOP_WRITEPAGE_ACTIVATE use in f2fs v2

[Christoph Hellwig]

Hi all,

this almost entirely cleans up usage of AOP_WRITEPAGE_ACTIVATE in f2fs.

Changes since v1:
 - pick up the bug fix from Chao as patch 1
 - release the folio batch on early exit
 - remove the dead for_reclaim handling
 - keep the ability of the caller to exit early for the redity case

Diffstat:
 fs/f2fs/checkpoint.c        |   36 ++++++++----------------
 fs/f2fs/compress.c          |    3 --
 fs/f2fs/data.c              |   23 ++-------------
 fs/f2fs/file.c              |    1 
 fs/f2fs/node.c              |   65 ++++++++++++++++++--------------------------
 include/trace/events/f2fs.h |    5 ---
 6 files changed, 46 insertions(+), 87 deletions(-)