f2fs: remove the rw_flag domain from f2fs_io_info

When using the f2fs_io_info in the low level, we still need to merge the
rw and rw_flag, so use the rw to hold all the io flags directly,
and remove the rw_flag field.

ps.It is based on the previous patch:
f2fs: move all the bio initialization into __bio_alloc
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/data.c

@@ -105,7 +105,7 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
 	if (!io->bio)
 		return;
 
-	rw = fio->rw | fio->rw_flag;
+	rw = fio->rw;
 
 	if (is_read_io(rw)) {
 		trace_f2fs_submit_read_bio(io->sbi->sb, rw,
@@ -760,7 +760,6 @@ static int f2fs_write_data_page(struct page *page,
 	struct f2fs_io_info fio = {
 		.type = DATA,
 		.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC: WRITE,
-		.rw_flag = 0,
 	};
 
 	if (page->index < end_index)

fs/f2fs/f2fs.h

@@ -369,8 +369,7 @@ enum page_type {
 
 struct f2fs_io_info {
 	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */
-	int rw;				/* contains R/RS/W/WS */
-	int rw_flag;			/* contains REQ_META/REQ_PRIO */
+	int rw;			/* contains R/RS/W/WS with REQ_META/REQ_PRIO */
 };
 
 #define is_read_io(rw)	(((rw) & 1) == READ)

fs/f2fs/gc.c

@@ -523,7 +523,6 @@ static void move_data_page(struct inode *inode, struct page *page, int gc_type)
 	struct f2fs_io_info fio = {
 		.type = DATA,
 		.rw = WRITE_SYNC,
-		.rw_flag = 0,
 	};
 
 	if (gc_type == BG_GC) {

fs/f2fs/node.c

@@ -94,8 +94,7 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
 	int i;
 	struct f2fs_io_info fio = {
 		.type = META,
-		.rw = READ_SYNC,
-		.rw_flag = REQ_META | REQ_PRIO
+		.rw = READ_SYNC | REQ_META | REQ_PRIO
 	};
 
 
@@ -1581,8 +1580,7 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
 	int page_idx = start;
 	struct f2fs_io_info fio = {
 		.type = META,
-		.rw = READ_SYNC,
-		.rw_flag = REQ_META | REQ_PRIO
+		.rw = READ_SYNC | REQ_META | REQ_PRIO
 	};
 
 	for (; page_idx < start + nrpages; page_idx++) {

fs/f2fs/segment.c

@@ -916,8 +916,7 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
 {
 	struct f2fs_io_info fio = {
 		.type = META,
-		.rw = WRITE_SYNC,
-		.rw_flag = REQ_META | REQ_PRIO
+		.rw = WRITE_SYNC | REQ_META | REQ_PRIO
 	};
 
 	set_page_writeback(page);
@@ -931,7 +930,6 @@ void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
 	struct f2fs_io_info fio = {
 		.type = NODE,
 		.rw = WRITE_SYNC,
-		.rw_flag = 0
 	};
 
 	set_summary(&sum, nid, 0, 0);
@@ -1018,7 +1016,6 @@ void rewrite_node_page(struct f2fs_sb_info *sbi,
 	struct f2fs_io_info fio = {
 		.type = NODE,
 		.rw = WRITE_SYNC,
-		.rw_flag = 0
 	};
 
 	curseg = CURSEG_I(sbi, type);
@@ -1598,8 +1595,7 @@ static int ra_sit_pages(struct f2fs_sb_info *sbi, int start, int nrpages)
 	int blkno = start;
 	struct f2fs_io_info fio = {
 		.type = META,
-		.rw = READ_SYNC,
-		.rw_flag = REQ_META | REQ_PRIO
+		.rw = READ_SYNC | REQ_META | REQ_PRIO
 	};
 
 	for (; blkno < start + nrpages && blkno < sit_blk_cnt; blkno++) {