btrfs: use EXPORT_FOR_TESTS for conditionally exported functions

Several functions in BTRFS are only used inside the source file they are
declared if CONFIG_BTRFS_FS_RUN_SANITY_TESTS is not defined. However if
CONFIG_BTRFS_FS_RUN_SANITY_TESTS is defined these functions are shared
with the unit tests code.

Before the introduction of the EXPORT_FOR_TESTS macro, these functions
could not be declared as static and the compiler had a harder task when
optimizing and inlining them.

As we have EXPORT_FOR_TESTS now, use it where appropriate to support the
compiler.

Reviewed-by: Nikolay Borisov <[e-mail]>
Signed-off-by: Johannes Thumshirn <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/extent_io.c

···
  *
  * 1 is returned if we find something, 0 if nothing was in the tree
  */
-static noinline_for_stack u64 find_lock_delalloc_range(struct inode *inode,
+EXPORT_FOR_TESTS
+noinline_for_stack u64 find_lock_delalloc_range(struct inode *inode,
 				    struct extent_io_tree *tree,
 				    struct page *locked_page, u64 *start,
 				    u64 *end)
···
 out_failed:
 	return found;
 }
-
-#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-u64 btrfs_find_lock_delalloc_range(struct inode *inode,
-				    struct extent_io_tree *tree,
-				    struct page *locked_page, u64 *start,
-				    u64 *end)
-{
-	return find_lock_delalloc_range(inode, tree, locked_page, start, end);
-}
-#endif
 
 static int __process_pages_contig(struct address_space *mapping,
 				  struct page *locked_page,

fs/btrfs/extent_io.h

···
 		    struct extent_io_tree *io_tree,
 		    struct io_failure_record *rec);
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-u64 btrfs_find_lock_delalloc_range(struct inode *inode,
-				      struct extent_io_tree *tree,
-				      struct page *locked_page, u64 *start,
-				      u64 *end);
+u64 find_lock_delalloc_range(struct inode *inode, struct extent_io_tree *tree,
+			     struct page *locked_page, u64 *start,
+			     u64 *end);
 #endif
 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 					       u64 start);

fs/btrfs/free-space-tree.c

···
 	return ret;
 }
 
-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)
+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_block_group_cache *block_group,
+		struct btrfs_path *path, int cow)
 {
 	struct btrfs_root *root = fs_info->free_space_root;
 	struct btrfs_key key;
···
 	}
 }
 
+EXPORT_FOR_TESTS
 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
 				  struct btrfs_block_group_cache *block_group,
 				  struct btrfs_path *path)
···
 	return ret;
 }
 
+EXPORT_FOR_TESTS
 int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
 				  struct btrfs_block_group_cache *block_group,
 				  struct btrfs_path *path)
···
 	return ret;
 }
 
+EXPORT_FOR_TESTS
 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
 			struct btrfs_path *path, u64 offset)
 {
···
 	return ret;
 }
 
+EXPORT_FOR_TESTS
 int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 				  struct btrfs_block_group_cache *block_group,
 				  struct btrfs_path *path, u64 start, u64 size)
···
 	return ret;
 }
 
+EXPORT_FOR_TESTS
 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)

fs/btrfs/tests/extent-io-tests.c

···
 	set_extent_delalloc(&tmp, 0, sectorsize - 1, 0, NULL);
 	start = 0;
 	end = 0;
-	found = btrfs_find_lock_delalloc_range(inode, &tmp, locked_page, &start,
+	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
 					 &end);
 	if (!found) {
 		test_err("should have found at least one delalloc");
···
 	set_extent_delalloc(&tmp, sectorsize, max_bytes - 1, 0, NULL);
 	start = test_start;
 	end = 0;
-	found = btrfs_find_lock_delalloc_range(inode, &tmp, locked_page, &start,
+	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
 					 &end);
 	if (!found) {
 		test_err("couldn't find delalloc in our range");
···
 	}
 	start = test_start;
 	end = 0;
-	found = btrfs_find_lock_delalloc_range(inode, &tmp, locked_page, &start,
+	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
 					 &end);
 	if (found) {
 		test_err("found range when we shouldn't have");
···
 	set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, 0, NULL);
 	start = test_start;
 	end = 0;
-	found = btrfs_find_lock_delalloc_range(inode, &tmp, locked_page, &start,
+	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
 					 &end);
 	if (!found) {
 		test_err("didn't find our range");
···
 	 * this changes at any point in the future we will need to fix this
 	 * tests expected behavior.
 	 */
-	found = btrfs_find_lock_delalloc_range(inode, &tmp, locked_page, &start,
+	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
 					 &end);
 	if (!found) {
 		test_err("didn't find our range");