f2fs: submit bio of in-place-update pages

This patch tries to split in-place-update bios from sequential bios.
Suggested-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -362,6 +362,9 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 	bio_set_op_attrs(bio, fio->op, fio->op_flags);
 
 	__submit_bio(fio->sbi, bio, fio->type);
+
+	if (!is_read_io(fio->op))
+		inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page));
 	return 0;
 }
 
@@ -1354,7 +1357,7 @@ int do_write_data_page(struct f2fs_io_info *fio)
 			!is_cold_data(page) &&
 			!IS_ATOMIC_WRITTEN_PAGE(page) &&
 			need_inplace_update(inode))) {
-		rewrite_data_page(fio);
+		err = rewrite_data_page(fio);
 		set_inode_flag(inode, FI_UPDATE_WRITE);
 		trace_f2fs_do_write_data_page(page, IPU);
 	} else {

fs/f2fs/f2fs.h

@@ -2206,7 +2206,7 @@ void update_meta_page(struct f2fs_sb_info *sbi, void *src, block_t blk_addr);
 void write_meta_page(struct f2fs_sb_info *sbi, struct page *page);
 void write_node_page(unsigned int nid, struct f2fs_io_info *fio);
 void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio);
-void rewrite_data_page(struct f2fs_io_info *fio);
+int rewrite_data_page(struct f2fs_io_info *fio);
 void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 			block_t old_blkaddr, block_t new_blkaddr,
 			bool recover_curseg, bool recover_newaddr);

fs/f2fs/segment.c

@@ -1961,11 +1961,11 @@ void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio)
 	f2fs_update_data_blkaddr(dn, fio->new_blkaddr);
 }
 
-void rewrite_data_page(struct f2fs_io_info *fio)
+int rewrite_data_page(struct f2fs_io_info *fio)
 {
 	fio->new_blkaddr = fio->old_blkaddr;
 	stat_inc_inplace_blocks(fio->sbi);
-	f2fs_submit_page_mbio(fio);
+	return f2fs_submit_page_bio(fio);
 }
 
 void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,