Btrfs: Further reduce the concurrency penalty of defrag and drop_snapshot

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/extent-tree.c

@@ -1312,7 +1312,10 @@ static void reada_walk_down(struct btrfs_root *root,
 		BUG_ON(ret);
 		if (refs != 1)
 			continue;
+		mutex_unlock(&root->fs_info->fs_mutex);
 		ret = readahead_tree_block(root, blocknr);
+		cond_resched();
+		mutex_lock(&root->fs_info->fs_mutex);
 		if (ret)
 			break;
 	}
@@ -1445,7 +1448,6 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 	struct btrfs_path *path;
 	int i;
 	int orig_level;
-	int num_walks = 0;
 	struct btrfs_root_item *root_item = &root->root_item;
 
 	path = btrfs_alloc_path();
@@ -1486,13 +1488,10 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 			break;
 		if (wret < 0)
 			ret = wret;
-		num_walks++;
-		if (num_walks > 2) {
 		ret = -EAGAIN;
 		get_bh(root->node);
 		break;
 	}
-	}
 	for (i = 0; i <= orig_level; i++) {
 		if (path->nodes[i]) {
 			btrfs_block_release(root, path->nodes[i]);

fs/btrfs/transaction.c

@@ -364,6 +364,9 @@ int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info)
 					break;
 			}
 			root->defrag_running = 0;
+			radix_tree_tag_clear(&info->fs_roots_radix,
+				     (unsigned long)root->root_key.objectid,
+				     BTRFS_ROOT_DEFRAG_TAG);
 		}
 	}
 	btrfs_end_transaction(trans, tree_root);

fs/btrfs/tree-defrag.c

@@ -148,7 +148,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
 	int level;
 	int orig_level;
 	int i;
-	int num_runs = 0;
 
 	if (root->ref_cows == 0) {
 		goto out;
@@ -200,11 +199,9 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
 			break;
 		if (wret < 0)
 			ret = wret;
-		if (num_runs++ > 8) {
 		ret = -EAGAIN;
 		break;
 	}
-	}
 	for (i = 0; i <= orig_level; i++) {
 		if (path->nodes[i]) {
 			btrfs_block_release(root, path->nodes[i]);