f2fs: introduce migration_window_granularity

f2fs: introduce migration_window_granularity

[ Upstream commit 8c890c4c60342719526520133fb1b6f69f196ab8 ]

We can control the scanning window granularity for GC migration. For
more frequent scanning and GC on zoned devices, we need a fine grained
control knob for it.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: 5cc69a27abfa ("f2fs: forcibly migrate to secure space for zoned device file pinning")
Signed-off-by: Sasha Levin <sashal@kernel.org>