From: liuderong <liuderong@oppo.com>

In cost-benefit GC algorithm, mtime will affect
the selection of victim segment.For a large section,
mtime should be the mean value of valid blocks,
in order to select correct victim segment,
it needs to modify the calculation method of mtime.

v3:
- add new define INVALID_MTIME and rename new API:f2fs_get_section_mtime

v2:
- modify new API:get_section_mtime

liuderong (2):
  f2fs: remove unused parameters
  f2fs: introduce f2fs_get_section_mtime

 fs/f2fs/f2fs.h    |  5 +++--
 fs/f2fs/gc.c      | 23 +++++++----------------
 fs/f2fs/segment.c | 38 +++++++++++++++++++++++++++++++-------
 fs/f2fs/segment.h |  6 ++++--
 4 files changed, 45 insertions(+), 27 deletions(-)

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2.7.4