f2fs: introduce nr_pages_to_write for segment alignment
This patch introduces nr_pages_to_write to align page writes to the segment
or other operational unit size, which can be tuned according to the system
environment.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index bbd9761..9fc46ee 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -683,3 +683,27 @@
else
return 0;
}
+
+/*
+ * When writing pages, it'd better align nr_to_write for segment size.
+ */
+static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
+ struct writeback_control *wbc)
+{
+ long nr_to_write, desired;
+
+ if (wbc->sync_mode != WB_SYNC_NONE)
+ return 0;
+
+ nr_to_write = wbc->nr_to_write;
+
+ if (type == DATA)
+ desired = 4096;
+ else if (type == NODE)
+ desired = 3 * max_hw_blocks(sbi);
+ else
+ desired = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
+
+ wbc->nr_to_write = desired;
+ return desired - nr_to_write;
+}