f2fs: introduce f2fs_flush_merged_bios for cleanup

Add a new helper f2fs_flush_merged_bios to clean up redundant codes.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/checkpoint.c

@@ -1141,9 +1141,7 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 
 	trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
 
-	f2fs_submit_merged_bio(sbi, DATA, WRITE);
-	f2fs_submit_merged_bio(sbi, NODE, WRITE);
-	f2fs_submit_merged_bio(sbi, META, WRITE);
+	f2fs_flush_merged_bios(sbi);
 
 	/*
 	 * update checkpoint pack index

fs/f2fs/data.c

@@ -206,6 +206,13 @@ void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
 		__f2fs_submit_merged_bio(sbi, inode, page, ino, type, rw);
 }
 
+void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi)
+{
+	f2fs_submit_merged_bio(sbi, DATA, WRITE);
+	f2fs_submit_merged_bio(sbi, NODE, WRITE);
+	f2fs_submit_merged_bio(sbi, META, WRITE);
+}
+
 /*
  * Fill the locked page with data located in the block address.
  * Return unlocked page.

fs/f2fs/f2fs.h

@@ -1907,6 +1907,7 @@ void destroy_checkpoint_caches(void);
 void f2fs_submit_merged_bio(struct f2fs_sb_info *, enum page_type, int);
 void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *, struct inode *,
 				struct page *, nid_t, enum page_type, int);
+void f2fs_flush_merged_bios(struct f2fs_sb_info *);
 int f2fs_submit_page_bio(struct f2fs_io_info *);
 void f2fs_submit_page_mbio(struct f2fs_io_info *);
 void set_data_blkaddr(struct dnode_of_data *);

fs/f2fs/super.c

@@ -583,11 +583,8 @@ static void f2fs_put_super(struct super_block *sb)
 	mutex_unlock(&sbi->umount_mutex);
 
 	/* our cp_error case, we can wait for any writeback page */
-	if (get_pages(sbi, F2FS_WRITEBACK)) {
-		f2fs_submit_merged_bio(sbi, DATA, WRITE);
-		f2fs_submit_merged_bio(sbi, NODE, WRITE);
-		f2fs_submit_merged_bio(sbi, META, WRITE);
-	}
+	if (get_pages(sbi, F2FS_WRITEBACK))
+		f2fs_flush_merged_bios(sbi);
 
 	iput(sbi->node_inode);
 	iput(sbi->meta_inode);