btrfs: merge setting ret and return ret

In many places we have pattern:

	ret = ...;
	return ret;

This can be simplified to a direct return, removing 'ret' if not
otherwise needed. The places in self tests are not converted so we can
add more test cases without changing surrounding code
(extent-map-tests.c:test_case_4()).

Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/block-group.c

@@ -1057,8 +1057,7 @@ static int remove_block_group_item(struct btrfs_trans_handle *trans,
 	if (ret < 0)
 		return ret;
 
-	ret = btrfs_del_item(trans, root, path);
-	return ret;
+	return btrfs_del_item(trans, root, path);
 }
 
 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,

fs/btrfs/ctree.c

@@ -4002,8 +4002,7 @@ int btrfs_split_item(struct btrfs_trans_handle *trans,
 	if (ret)
 		return ret;
 
-	ret = split_item(trans, path, new_key, split_offset);
-	return ret;
+	return split_item(trans, path, new_key, split_offset);
 }
 
 /*

fs/btrfs/delayed-inode.c

@@ -1137,8 +1137,8 @@ __btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
 	ret = btrfs_record_root_in_trans(trans, node->root);
 	if (ret)
 		return ret;
-	ret = btrfs_update_delayed_inode(trans, node->root, path, node);
-	return ret;
+
+	return btrfs_update_delayed_inode(trans, node->root, path, node);
 }
 
 /*

fs/btrfs/disk-io.c

@@ -175,7 +175,6 @@ static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb,
 	const u32 step = min(fs_info->nodesize, PAGE_SIZE);
 	const u32 nr_steps = eb->len / step;
 	phys_addr_t paddrs[BTRFS_MAX_BLOCKSIZE / PAGE_SIZE];
-	int ret = 0;
 
 	if (sb_rdonly(fs_info->sb))
 		return -EROFS;
@@ -197,9 +196,8 @@ static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb,
 		paddrs[i] = page_to_phys(&folio->page) + offset_in_page(eb->start);
 	}
 
-	ret = btrfs_repair_io_failure(fs_info, 0, eb->start, eb->len, eb->start,
-				      paddrs, step, mirror_num);
-	return ret;
+	return btrfs_repair_io_failure(fs_info, 0, eb->start, eb->len,
+				       eb->start, paddrs, step, mirror_num);
 }
 
 /*
@@ -2145,11 +2143,10 @@ static int load_global_roots(struct btrfs_root *tree_root)
 		return ret;
 	if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
 		return ret;
-	ret = load_global_roots_objectid(tree_root, path,
-					 BTRFS_FREE_SPACE_TREE_OBJECTID,
-					 "free space");
 
-	return ret;
+	return load_global_roots_objectid(tree_root, path,
+					  BTRFS_FREE_SPACE_TREE_OBJECTID,
+					  "free space");
 }
 
 static int btrfs_read_roots(struct btrfs_fs_info *fs_info)

fs/btrfs/extent-io-tree.c

@@ -187,8 +187,6 @@ static int add_extent_changeset(struct extent_state *state, u32 bits,
 				 struct extent_changeset *changeset,
 				 int set)
 {
-	int ret;
-
 	if (!changeset)
 		return 0;
 	if (set && (state->state & bits) == bits)
@@ -196,9 +194,8 @@ static int add_extent_changeset(struct extent_state *state, u32 bits,
 	if (!set && (state->state & bits) == 0)
 		return 0;
 	changeset->bytes_changed += state->end - state->start + 1;
-	ret = ulist_add(&changeset->range_changed, state->start, state->end,
-			GFP_ATOMIC);
-	return ret;
+
+	return ulist_add(&changeset->range_changed, state->start, state->end, GFP_ATOMIC);
 }
 
 static inline struct extent_state *next_state(struct extent_state *state)

fs/btrfs/extent-tree.c

@@ -2559,7 +2559,6 @@ static u64 get_alloc_profile_by_root(struct btrfs_root *root, int data)
 {
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	u64 flags;
-	u64 ret;
 
 	if (data)
 		flags = BTRFS_BLOCK_GROUP_DATA;
@@ -2568,8 +2567,7 @@ static u64 get_alloc_profile_by_root(struct btrfs_root *root, int data)
 	else
 		flags = BTRFS_BLOCK_GROUP_METADATA;
 
-	ret = btrfs_get_alloc_profile(fs_info, flags);
-	return ret;
+	return btrfs_get_alloc_profile(fs_info, flags);
 }
 
 static u64 first_logical_byte(struct btrfs_fs_info *fs_info)
@@ -4191,10 +4189,8 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info,
 			else
 				trans = btrfs_join_transaction(root);
 
-			if (IS_ERR(trans)) {
-				ret = PTR_ERR(trans);
-				return ret;
-			}
+			if (IS_ERR(trans))
+				return PTR_ERR(trans);
 
 			ret = btrfs_chunk_alloc(trans, space_info, ffe_ctl->flags,
 						CHUNK_ALLOC_FORCE_FOR_EXTENT);

fs/btrfs/file.c

@@ -1272,8 +1272,7 @@ again:
 		btrfs_delalloc_release_extents(inode, reserved_len);
 		release_space(inode, *data_reserved, reserved_start, reserved_len,
 			      only_release_metadata);
-		ret = extents_locked;
-		return ret;
+		return extents_locked;
 	}
 
 	copied = copy_folio_from_iter_atomic(folio, offset_in_folio(folio, start),

fs/btrfs/free-space-tree.c

@@ -1525,9 +1525,7 @@ int btrfs_remove_block_group_free_space(struct btrfs_trans_handle *trans,
 		btrfs_release_path(path);
 	}
 
-	ret = 0;
-
-	return ret;
+	return 0;
 }
 
 static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl,

fs/btrfs/inode-item.c

@@ -371,14 +371,13 @@ int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
 			     struct btrfs_path *path, u64 objectid)
 {
 	struct btrfs_key key;
-	int ret;
+
 	key.objectid = objectid;
 	key.type = BTRFS_INODE_ITEM_KEY;
 	key.offset = 0;
 
-	ret = btrfs_insert_empty_item(trans, root, path, &key,
-				      sizeof(struct btrfs_inode_item));
-	return ret;
+	return btrfs_insert_empty_item(trans, root, path, &key,
+				       sizeof(struct btrfs_inode_item));
 }
 
 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root

fs/btrfs/inode.c

@@ -2372,7 +2372,6 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_fol
 			     u64 start, u64 end, struct writeback_control *wbc)
 {
 	const bool zoned = btrfs_is_zoned(inode->root->fs_info);
-	int ret;
 
 	/*
 	 * The range must cover part of the @locked_folio, or a return of 1
@@ -2381,10 +2380,8 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_fol
 	ASSERT(!(end <= folio_pos(locked_folio) ||
 		 start >= folio_next_pos(locked_folio)));
 
-	if (should_nocow(inode, start, end)) {
-		ret = run_delalloc_nocow(inode, locked_folio, start, end);
-		return ret;
-	}
+	if (should_nocow(inode, start, end))
+		return run_delalloc_nocow(inode, locked_folio, start, end);
 
 	if (btrfs_inode_can_compress(inode) &&
 	    inode_need_compress(inode, start, end) &&
@@ -2392,11 +2389,9 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_fol
 		return 1;
 
 	if (zoned)
-		ret = run_delalloc_cow(inode, locked_folio, start, end, wbc,
-				       true);
+		return run_delalloc_cow(inode, locked_folio, start, end, wbc, true);
 	else
-		ret = cow_file_range(inode, locked_folio, start, end, NULL, 0);
-	return ret;
+		return cow_file_range(inode, locked_folio, start, end, NULL, 0);
 }
 
 void btrfs_split_delalloc_extent(struct btrfs_inode *inode,

fs/btrfs/qgroup.c

@@ -694,7 +694,6 @@ void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
 				    u64 dst)
 {
-	int ret;
 	struct btrfs_root *quota_root = trans->fs_info->quota_root;
 	BTRFS_PATH_AUTO_FREE(path);
 	struct btrfs_key key;
@@ -707,8 +706,7 @@ static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
 	key.type = BTRFS_QGROUP_RELATION_KEY;
 	key.offset = dst;
 
-	ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
-	return ret;
+	return btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
 }
 
 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
@@ -833,9 +831,7 @@ static int del_qgroup_item(struct btrfs_trans_handle *trans, u64 qgroupid)
 	if (ret > 0)
 		return -ENOENT;
 
-	ret = btrfs_del_item(trans, quota_root, path);
-
-	return ret;
+	return btrfs_del_item(trans, quota_root, path);
 }
 
 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
@@ -2655,10 +2651,8 @@ int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
 			return ret;
 	}
 
-	if (root_level == 0) {
-		ret = btrfs_qgroup_trace_leaf_items(trans, root_eb);
-		return ret;
-	}
+	if (root_level == 0)
+		return btrfs_qgroup_trace_leaf_items(trans, root_eb);
 
 	path = btrfs_alloc_path();
 	if (!path)

fs/btrfs/relocation.c

@@ -3254,7 +3254,6 @@ static int delete_v1_space_cache(struct extent_buffer *leaf,
 	struct btrfs_key key;
 	bool found = false;
 	int i;
-	int ret;
 
 	if (btrfs_header_owner(leaf) != BTRFS_ROOT_TREE_OBJECTID)
 		return 0;
@@ -3278,8 +3277,8 @@ static int delete_v1_space_cache(struct extent_buffer *leaf,
 	}
 	if (!found)
 		return -ENOENT;
-	ret = delete_block_group_cache(block_group, NULL, space_cache_ino);
-	return ret;
+
+	return delete_block_group_cache(block_group, NULL, space_cache_ino);
 }
 
 /*

fs/btrfs/volumes.c

@@ -2316,9 +2316,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info,
 		free_fs_devices(cur_devices);
 	}
 
-	ret = btrfs_commit_transaction(trans);
-
-	return ret;
+	return btrfs_commit_transaction(trans);
 
 error_undo:
 	if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
@@ -7167,7 +7165,6 @@ static int read_one_dev(struct extent_buffer *leaf,
 	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
 	struct btrfs_device *device;
 	u64 devid;
-	int ret;
 	u8 fs_uuid[BTRFS_FSID_SIZE];
 	u8 dev_uuid[BTRFS_UUID_SIZE];
 
@@ -7267,8 +7264,8 @@ static int read_one_dev(struct extent_buffer *leaf,
 		atomic64_add(device->total_bytes - device->bytes_used,
 				&fs_info->free_chunk_space);
 	}
-	ret = 0;
-	return ret;
+
+	return 0;
 }
 
 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info)