btrfs: push lookup_info into struct walk_control

Instead of using a flag we're passing around everywhere, add a field to
walk_control that we're already passing around everywhere and use that
instead.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -5220,6 +5220,8 @@ struct walk_control {
 	int reada_slot;
 	int reada_count;
 	int restarted;
+	/* Indicate that extent info needs to be looked up when walking the tree. */
+	int lookup_info;
 };
 
 #define DROP_REFERENCE	1
@@ -5316,7 +5318,7 @@ static noinline void reada_walk_down(struct btrfs_trans_handle *trans,
 static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 				   struct btrfs_root *root,
 				   struct btrfs_path *path,
-				   struct walk_control *wc, int lookup_info)
+				   struct walk_control *wc)
 {
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	int level = wc->level;
@@ -5331,7 +5333,7 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 	 * when reference count of tree block is 1, it won't increase
 	 * again. once full backref flag is set, we never clear it.
 	 */
-	if (lookup_info &&
+	if (wc->lookup_info &&
 	    ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) ||
 	     (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) {
 		BUG_ON(!path->locks[level]);
@@ -5423,7 +5425,7 @@ static int check_ref_exists(struct btrfs_trans_handle *trans,
 static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 				 struct btrfs_root *root,
 				 struct btrfs_path *path,
-				 struct walk_control *wc, int *lookup_info)
+				 struct walk_control *wc)
 {
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	u64 bytenr;
@@ -5445,7 +5447,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 	 */
 	if (wc->stage == UPDATE_BACKREF &&
 	    generation <= root->root_key.offset) {
-		*lookup_info = 1;
+		wc->lookup_info = 1;
 		return 1;
 	}
 
@@ -5477,7 +5479,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 		ret = -EIO;
 		goto out_unlock;
 	}
-	*lookup_info = 0;
+	wc->lookup_info = 0;
 
 	if (wc->stage == DROP_REFERENCE) {
 		if (wc->refs[level - 1] > 1) {
@@ -5515,7 +5517,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 			return ret;
 		}
 		btrfs_tree_lock(next);
-		*lookup_info = 1;
+		wc->lookup_info = 1;
 	}
 
 	level--;
@@ -5604,7 +5606,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 			goto out_unlock;
 	}
 no_delete:
-	*lookup_info = 1;
+	wc->lookup_info = 1;
 	ret = 1;
 
 out_unlock:
@@ -5738,11 +5740,11 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
 				   struct walk_control *wc)
 {
 	int level = wc->level;
-	int lookup_info = 1;
 	int ret = 0;
 
+	wc->lookup_info = 1;
 	while (level >= 0) {
-		ret = walk_down_proc(trans, root, path, wc, lookup_info);
+		ret = walk_down_proc(trans, root, path, wc);
 		if (ret)
 			break;
 
@@ -5753,7 +5755,7 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
 		    btrfs_header_nritems(path->nodes[level]))
 			break;
 
-		ret = do_walk_down(trans, root, path, wc, &lookup_info);
+		ret = do_walk_down(trans, root, path, wc);
 		if (ret > 0) {
 			path->slots[level]++;
 			continue;