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>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 7cc146bcbfed..5e9c38e846a5 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1202,7 +1202,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
                             struct writeback_control *wbc)
 {
         struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
-        long nr_to_write = wbc->nr_to_write;
+        long diff;
 
         /* balancing f2fs's metadata in background */
         f2fs_balance_fs_bg(sbi);
@@ -1211,12 +1211,10 @@ static int f2fs_write_node_pages(struct address_space *mapping,
         if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
                 goto skip_write;
 
-        /* if mounting is failed, skip writing node pages */
-        wbc->nr_to_write = 3 * max_hw_blocks(sbi);
+        diff = nr_pages_to_write(sbi, NODE, wbc);
         wbc->sync_mode = WB_SYNC_NONE;
         sync_node_pages(sbi, 0, wbc);
-        wbc->nr_to_write = nr_to_write - (3 * max_hw_blocks(sbi) -
-                                                wbc->nr_to_write);
+        wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
         return 0;
 
 skip_write: