FROMLIST: f2fs: early updates queued for v4.18-rc1
Cherry-picked from:
origin/upstream-f2fs-stable-linux-4.14.y
72497b8d5271 ("f2fs: turn down IO priority of discard from background")
cfe6e2f69eef ("f2fs: don't split checkpoint in fstrim")
596c97672db2 ("f2fs: issue discard commands proactively in high fs utilization")
0fbb04e9980a ("f2fs: add fsync_mode=nobarrier for non-atomic files")
13e346436f4e ("f2fs: let fstrim issue discard commands in lower priority")
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>