btrfs: tests, use BTRFS_FS_STATE_DUMMY_FS_INFO instead of dummy root

Now that we have a dummy fs_info associated with each test that
uses a root, we don't need the DUMMY_ROOT bit anymore.  This lets
us make choices without needing an actual root like in e.g.
btrfs_find_create_tree_block.
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/backref.c

@@ -361,7 +361,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
 		goto out;
 	}
 
-	if (btrfs_test_is_dummy_root(root)) {
+	if (btrfs_is_testing(fs_info)) {
 		srcu_read_unlock(&fs_info->subvol_srcu, index);
 		ret = -ENOENT;
 		goto out;

fs/btrfs/ctree.c

@@ -1505,7 +1505,7 @@ static inline int should_cow_block(struct btrfs_trans_handle *trans,
 				   struct btrfs_root *root,
 				   struct extent_buffer *buf)
 {
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(root->fs_info))
 		return 0;
 
 	/* ensure we can see the force_cow */

fs/btrfs/ctree.h

@@ -1115,12 +1115,11 @@ struct btrfs_subvolume_writers {
 #define BTRFS_ROOT_REF_COWS		1
 #define BTRFS_ROOT_TRACK_DIRTY		2
 #define BTRFS_ROOT_IN_RADIX		3
-#define BTRFS_ROOT_DUMMY_ROOT		4
-#define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	5
-#define BTRFS_ROOT_DEFRAG_RUNNING	6
-#define BTRFS_ROOT_FORCE_COW		7
-#define BTRFS_ROOT_MULTI_LOG_TASKS	8
-#define BTRFS_ROOT_DIRTY		9
+#define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	4
+#define BTRFS_ROOT_DEFRAG_RUNNING	5
+#define BTRFS_ROOT_FORCE_COW		6
+#define BTRFS_ROOT_MULTI_LOG_TASKS	7
+#define BTRFS_ROOT_DIRTY		8
 
 /*
  * in ram representation of the tree.  extent_root is used for all allocations
@@ -3613,13 +3612,13 @@ static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
 void btrfs_test_destroy_inode(struct inode *inode);
 #endif
 
-static inline int btrfs_test_is_dummy_root(struct btrfs_root *root)
+static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
 {
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-	if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
+	if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
+			      &fs_info->fs_state)))
 		return 1;
 #endif
 	return 0;
 }
-
 #endif

fs/btrfs/disk-io.c

@@ -1146,7 +1146,7 @@ struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 						 u64 bytenr)
 {
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(root->fs_info))
 		return alloc_test_extent_buffer(root->fs_info, bytenr,
 				root->nodesize);
 	return alloc_extent_buffer(root->fs_info, bytenr);
@@ -1330,7 +1330,6 @@ struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info,
 	/* We don't use the stripesize in selftest, set it as sectorsize */
 	__setup_root(nodesize, sectorsize, sectorsize, root, fs_info,
 			BTRFS_ROOT_TREE_OBJECTID);
-	set_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state);
 	root->alloc_bytenr = 0;
 
 	return root;

fs/btrfs/extent-tree.c

@@ -3235,7 +3235,7 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
 			    u64, u64, u64, u64, u64, u64);
 
 
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(root->fs_info))
 		return 0;
 
 	ref_root = btrfs_header_owner(buf);
@@ -6101,7 +6101,7 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes)
 	if (dropped > 0)
 		to_free += btrfs_calc_trans_metadata_size(root, dropped);
 
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(root->fs_info))
 		return;
 
 	trace_btrfs_space_reservation(root->fs_info, "delalloc",
@@ -7217,7 +7217,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	int ret;
 	struct btrfs_fs_info *fs_info = root->fs_info;
 
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(fs_info))
 		return 0;
 
 	add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid);
@@ -8356,7 +8356,7 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
 						 SKINNY_METADATA);
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-	if (btrfs_test_is_dummy_root(root)) {
+	if (btrfs_is_testing(root->fs_info)) {
 		buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
 					    level);
 		if (!IS_ERR(buf))

fs/btrfs/inode.c

@@ -1744,7 +1744,7 @@ static void btrfs_set_bit_hook(struct inode *inode,
 		}
 
 		/* For sanity tests */
-		if (btrfs_test_is_dummy_root(root))
+		if (btrfs_is_testing(root->fs_info))
 			return;
 
 		__percpu_counter_add(&root->fs_info->delalloc_bytes, len,
@@ -1803,7 +1803,7 @@ static void btrfs_clear_bit_hook(struct inode *inode,
 			btrfs_delalloc_release_metadata(inode, len);
 
 		/* For sanity tests. */
-		if (btrfs_test_is_dummy_root(root))
+		if (btrfs_is_testing(root->fs_info))
 			return;
 
 		if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID

fs/btrfs/qgroup.c

@@ -571,7 +571,7 @@ static int add_qgroup_item(struct btrfs_trans_handle *trans,
 	struct extent_buffer *leaf;
 	struct btrfs_key key;
 
-	if (btrfs_test_is_dummy_root(quota_root))
+	if (btrfs_is_testing(quota_root->fs_info))
 		return 0;
 
 	path = btrfs_alloc_path();
@@ -728,7 +728,7 @@ static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
 	int ret;
 	int slot;
 
-	if (btrfs_test_is_dummy_root(root))
+	if (btrfs_is_testing(root->fs_info))
 		return 0;
 
 	key.objectid = 0;