btrfs: get fs_info from block group in search_free_space_info

We can read fs_info from the block group cache structure and can drop it
from the parameters.  Though the transaction is also availabe, it's not
guaranteed to be non-NULL.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/free-space-tree.c

@@ -76,10 +76,11 @@ static int add_new_free_space_info(struct btrfs_trans_handle *trans,
 
 EXPORT_FOR_TESTS
 struct btrfs_free_space_info *search_free_space_info(
-		struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info,
+		struct btrfs_trans_handle *trans,
 		struct btrfs_block_group_cache *block_group,
 		struct btrfs_path *path, int cow)
 {
+	struct btrfs_fs_info *fs_info = block_group->fs_info;
 	struct btrfs_root *root = fs_info->free_space_root;
 	struct btrfs_key key;
 	int ret;
@@ -253,7 +254,7 @@ int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
 		btrfs_release_path(path);
 	}
 
-	info = search_free_space_info(trans, fs_info, block_group, path, 1);
+	info = search_free_space_info(trans, block_group, path, 1);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto out;
@@ -398,7 +399,7 @@ int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
 		btrfs_release_path(path);
 	}
 
-	info = search_free_space_info(trans, fs_info, block_group, path, 1);
+	info = search_free_space_info(trans, block_group, path, 1);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto out;
@@ -463,8 +464,7 @@ static int update_free_space_extent_count(struct btrfs_trans_handle *trans,
 	if (new_extents == 0)
 		return 0;
 
-	info = search_free_space_info(trans, trans->fs_info, block_group, path,
-				      1);
+	info = search_free_space_info(trans, block_group, path, 1);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto out;
@@ -793,8 +793,7 @@ int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 			return ret;
 	}
 
-	info = search_free_space_info(NULL, trans->fs_info, block_group, path,
-				      0);
+	info = search_free_space_info(NULL, block_group, path, 0);
 	if (IS_ERR(info))
 		return PTR_ERR(info);
 	flags = btrfs_free_space_flags(path->nodes[0], info);
@@ -977,7 +976,6 @@ int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
 			     struct btrfs_block_group_cache *block_group,
 			     struct btrfs_path *path, u64 start, u64 size)
 {
-	struct btrfs_fs_info *fs_info = trans->fs_info;
 	struct btrfs_free_space_info *info;
 	u32 flags;
 	int ret;
@@ -988,7 +986,7 @@ int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
 			return ret;
 	}
 
-	info = search_free_space_info(NULL, fs_info, block_group, path, 0);
+	info = search_free_space_info(NULL, block_group, path, 0);
 	if (IS_ERR(info))
 		return PTR_ERR(info);
 	flags = btrfs_free_space_flags(path->nodes[0], info);
@@ -1534,14 +1532,12 @@ static int load_free_space_extents(struct btrfs_caching_control *caching_ctl,
 int load_free_space_tree(struct btrfs_caching_control *caching_ctl)
 {
 	struct btrfs_block_group_cache *block_group;
-	struct btrfs_fs_info *fs_info;
 	struct btrfs_free_space_info *info;
 	struct btrfs_path *path;
 	u32 extent_count, flags;
 	int ret;
 
 	block_group = caching_ctl->block_group;
-	fs_info = block_group->fs_info;
 
 	path = btrfs_alloc_path();
 	if (!path)
@@ -1555,7 +1551,7 @@ int load_free_space_tree(struct btrfs_caching_control *caching_ctl)
 	path->search_commit_root = 1;
 	path->reada = READA_FORWARD;
 
-	info = search_free_space_info(NULL, fs_info, block_group, path, 0);
+	info = search_free_space_info(NULL, block_group, path, 0);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto out;

fs/btrfs/free-space-tree.h

@@ -30,7 +30,6 @@ int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct btrfs_free_space_info *
 search_free_space_info(struct btrfs_trans_handle *trans,
-		       struct btrfs_fs_info *fs_info,
 		       struct btrfs_block_group_cache *block_group,
 		       struct btrfs_path *path, int cow);
 int __add_to_free_space_tree(struct btrfs_trans_handle *trans,

fs/btrfs/tests/free-space-tree-tests.c

@@ -30,7 +30,7 @@ static int __check_free_space_extents(struct btrfs_trans_handle *trans,
 	unsigned int i;
 	int ret;
 
-	info = search_free_space_info(trans, fs_info, cache, path, 0);
+	info = search_free_space_info(trans, cache, path, 0);
 	if (IS_ERR(info)) {
 		test_err("could not find free space info");
 		ret = PTR_ERR(info);
@@ -115,7 +115,7 @@ static int check_free_space_extents(struct btrfs_trans_handle *trans,
 	u32 flags;
 	int ret;
 
-	info = search_free_space_info(trans, fs_info, cache, path, 0);
+	info = search_free_space_info(trans, cache, path, 0);
 	if (IS_ERR(info)) {
 		test_err("could not find free space info");
 		btrfs_release_path(path);