f2fs: add need_dentry_mark

This patch introduces need_dentry_mark() to clean up and avoid redundant
node locks.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1565,6 +1565,7 @@ struct dnode_of_data;
 struct node_info;
 
 bool available_free_memory(struct f2fs_sb_info *, int);
+int need_dentry_mark(struct f2fs_sb_info *, nid_t);
 bool is_checkpointed_node(struct f2fs_sb_info *, nid_t);
 bool need_inode_block_update(struct f2fs_sb_info *, nid_t);
 void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);

fs/f2fs/node.c

@@ -195,32 +195,35 @@ static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
 							start, nr);
 }
 
-bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
+int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct nat_entry *e;
-	bool is_cp = true;
+	bool need = false;
 
 	down_read(&nm_i->nat_tree_lock);
 	e = __lookup_nat_cache(nm_i, nid);
-	if (e && !get_nat_flag(e, IS_CHECKPOINTED))
-		is_cp = false;
+	if (e) {
+		if (!get_nat_flag(e, IS_CHECKPOINTED) &&
+				!get_nat_flag(e, HAS_FSYNCED_INODE))
+			need = true;
+	}
 	up_read(&nm_i->nat_tree_lock);
-	return is_cp;
+	return need;
 }
 
-static bool has_fsynced_inode(struct f2fs_sb_info *sbi, nid_t ino)
+bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct nat_entry *e;
-	bool fsynced = false;
+	bool is_cp = true;
 
 	down_read(&nm_i->nat_tree_lock);
-	e = __lookup_nat_cache(nm_i, ino);
-	if (e && get_nat_flag(e, HAS_FSYNCED_INODE))
-		fsynced = true;
+	e = __lookup_nat_cache(nm_i, nid);
+	if (e && !get_nat_flag(e, IS_CHECKPOINTED))
+		is_cp = false;
 	up_read(&nm_i->nat_tree_lock);
-	return fsynced;
+	return is_cp;
 }
 
 bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
@@ -1206,13 +1209,9 @@ continue_unlock:
 			/* called by fsync() */
 			if (ino && IS_DNODE(page)) {
 				set_fsync_mark(page, 1);
-				if (IS_INODE(page)) {
-					if (!is_checkpointed_node(sbi, ino) &&
-						!has_fsynced_inode(sbi, ino))
-						set_dentry_mark(page, 1);
-					else
-						set_dentry_mark(page, 0);
-				}
+				if (IS_INODE(page))
+					set_dentry_mark(page,
+						need_dentry_mark(sbi, ino));
 				nwritten++;
 			} else {
 				set_fsync_mark(page, 0);