diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5607393..fb5e5c2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -194,8 +194,9 @@
 	if (!is_read_io(rw))
 		inc_page_count(sbi, F2FS_WRITEBACK);
 
-	if (io->bio && io->last_block_in_bio != blk_addr - 1)
-		__submit_merged_bio(sbi, io, type, true, rw);
+	if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
+						io->rw_flag != rw))
+		__submit_merged_bio(sbi, io, type, false, io->rw_flag);
 alloc_new:
 	if (io->bio == NULL) {
 		bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
@@ -203,6 +204,7 @@
 		io->bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
 		io->bio->bi_end_io = is_read_io(rw) ? f2fs_read_end_io :
 							f2fs_write_end_io;
+		io->rw_flag = rw;
 		/*
 		 * The end_io will be assigned at the sumbission phase.
 		 * Until then, let bio_add_page() merge consecutive IOs as much
@@ -212,7 +214,7 @@
 
 	if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
 							PAGE_CACHE_SIZE) {
-		__submit_merged_bio(sbi, io, type, true, rw);
+		__submit_merged_bio(sbi, io, type, false, rw);
 		goto alloc_new;
 	}
 
@@ -641,7 +643,7 @@
 	return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro);
 }
 
-int do_write_data_page(struct page *page)
+int do_write_data_page(struct page *page, struct writeback_control *wbc)
 {
 	struct inode *inode = page->mapping->host;
 	block_t old_blk_addr, new_blk_addr;
@@ -669,10 +671,10 @@
 			!is_cold_data(page) &&
 			need_inplace_update(inode))) {
 		rewrite_data_page(F2FS_SB(inode->i_sb), page,
-						old_blk_addr);
+						old_blk_addr, wbc);
 	} else {
 		write_data_page(inode, page, &dn,
-				old_blk_addr, &new_blk_addr);
+				old_blk_addr, &new_blk_addr, wbc);
 		update_extent_cache(new_blk_addr, &dn);
 	}
 out_writepage:
@@ -719,10 +721,10 @@
 	if (S_ISDIR(inode->i_mode)) {
 		dec_page_count(sbi, F2FS_DIRTY_DENTS);
 		inode_dec_dirty_dents(inode);
-		err = do_write_data_page(page);
+		err = do_write_data_page(page, wbc);
 	} else {
 		f2fs_lock_op(sbi);
-		err = do_write_data_page(page);
+		err = do_write_data_page(page, wbc);
 		f2fs_unlock_op(sbi);
 		need_balance_fs = true;
 	}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index dca18b3..b1df239 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -368,6 +368,7 @@
 struct f2fs_bio_info {
 	struct bio *bio;		/* bios to merge */
 	sector_t last_block_in_bio;	/* last block number */
+	int rw_flag;				/* rw flag for all pages */
 	struct mutex io_mutex;		/* mutex for bio */
 };
 
@@ -1098,8 +1099,9 @@
 void write_node_page(struct f2fs_sb_info *, struct page *, unsigned int,
 					block_t, block_t *);
 void write_data_page(struct inode *, struct page *, struct dnode_of_data*,
-					block_t, block_t *);
-void rewrite_data_page(struct f2fs_sb_info *, struct page *, block_t);
+			block_t, block_t *, struct writeback_control *);
+void rewrite_data_page(struct f2fs_sb_info *, struct page *, block_t,
+				struct writeback_control *);
 void recover_data_page(struct f2fs_sb_info *, struct page *,
 				struct f2fs_summary *, block_t, block_t);
 void rewrite_node_page(struct f2fs_sb_info *, struct page *,
@@ -1150,7 +1152,7 @@
 struct page *find_data_page(struct inode *, pgoff_t, bool);
 struct page *get_lock_data_page(struct inode *, pgoff_t);
 struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
-int do_write_data_page(struct page *);
+int do_write_data_page(struct page *, struct writeback_control *);
 
 /*
  * gc.c
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 29ceb9d..c68fba5 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -520,6 +520,10 @@
 
 static void move_data_page(struct inode *inode, struct page *page, int gc_type)
 {
+	struct writeback_control wbc = {
+		.sync_mode = 1,
+	};
+
 	if (gc_type == BG_GC) {
 		if (PageWriteback(page))
 			goto out;
@@ -536,7 +540,7 @@
 			inode_dec_dirty_dents(inode);
 		}
 		set_cold_data(page);
-		do_write_data_page(page);
+		do_write_data_page(page, &wbc);
 		clear_cold_data(page);
 	}
 out:
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index ca9adf5..e5dc411 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -856,12 +856,13 @@
 
 static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
 			block_t old_blkaddr, block_t *new_blkaddr,
-			struct f2fs_summary *sum, enum page_type p_type)
+			struct f2fs_summary *sum, enum page_type p_type,
+			struct writeback_control *wbc)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 	struct curseg_info *curseg;
 	unsigned int old_cursegno;
-	int type;
+	int type, rw = WRITE;
 
 	type = __get_segment_type(page, p_type);
 	curseg = CURSEG_I(sbi, type);
@@ -900,7 +901,9 @@
 		fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
 
 	/* writeout dirty page into bdev */
-	f2fs_submit_page_mbio(sbi, page, *new_blkaddr, p_type, WRITE);
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		rw |= WRITE_SYNC;
+	f2fs_submit_page_mbio(sbi, page, *new_blkaddr, p_type, rw);
 
 	mutex_unlock(&curseg->curseg_mutex);
 }
@@ -915,13 +918,16 @@
 		unsigned int nid, block_t old_blkaddr, block_t *new_blkaddr)
 {
 	struct f2fs_summary sum;
+	struct writeback_control wbc = {
+		.sync_mode = 1,
+	};
 	set_summary(&sum, nid, 0, 0);
-	do_write_page(sbi, page, old_blkaddr, new_blkaddr, &sum, NODE);
+	do_write_page(sbi, page, old_blkaddr, new_blkaddr, &sum, NODE, &wbc);
 }
 
 void write_data_page(struct inode *inode, struct page *page,
 		struct dnode_of_data *dn, block_t old_blkaddr,
-		block_t *new_blkaddr)
+		block_t *new_blkaddr, struct writeback_control *wbc)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 	struct f2fs_summary sum;
@@ -932,13 +938,14 @@
 	set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
 
 	do_write_page(sbi, page, old_blkaddr,
-			new_blkaddr, &sum, DATA);
+			new_blkaddr, &sum, DATA, wbc);
 }
 
 void rewrite_data_page(struct f2fs_sb_info *sbi, struct page *page,
-					block_t old_blk_addr)
+			block_t old_blk_addr, struct writeback_control *wbc)
 {
-	f2fs_submit_page_mbio(sbi, page, old_blk_addr, DATA, WRITE);
+	int rw = wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE;
+	f2fs_submit_page_mbio(sbi, page, old_blk_addr, DATA, rw);
 }
 
 void recover_data_page(struct f2fs_sb_info *sbi,
@@ -1025,7 +1032,7 @@
 
 	/* rewrite node page */
 	set_page_writeback(page);
-	f2fs_submit_page_mbio(sbi, page, new_blkaddr, NODE, WRITE);
+	f2fs_submit_page_mbio(sbi, page, new_blkaddr, NODE, WRITE_SYNC);
 	f2fs_submit_merged_bio(sbi, NODE, true, WRITE);
 	refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
 
@@ -1593,7 +1600,7 @@
 			continue;
 		}
 
-		f2fs_submit_page_mbio(sbi, page, blk_addr, META, READ);
+		f2fs_submit_page_mbio(sbi, page, blk_addr, META, READ_SYNC);
 
 		mark_page_accessed(page);
 		f2fs_put_page(page, 0);