18  * eb, the lockdep key is determined by the btrfs_root it belongs to and
19  * the level the eb occupies in the tree.
82 void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, int level)  in btrfs_set_buffer_lockdep_class()  argument
93 	lockdep_set_class_and_name(&eb->lock, &ks->keys[level], ks->names[level]);  in btrfs_set_buffer_lockdep_class()
96 void btrfs_maybe_reset_lockdep_class(struct btrfs_root *root, struct extent_buffer *eb)  in btrfs_maybe_reset_lockdep_class()  argument
100 					       eb, btrfs_header_level(eb));  in btrfs_maybe_reset_lockdep_class()
106 static void btrfs_set_eb_lock_owner(struct extent_buffer *eb, pid_t owner)  in btrfs_set_eb_lock_owner()  argument
108 	eb->lock_owner = owner;  in btrfs_set_eb_lock_owner()
111 static void btrfs_set_eb_lock_owner(struct extent_buffer *eb, pid_t owner) { }  in btrfs_set_eb_lock_owner()  argument
132  * @eb:		the eb to be locked
138 void btrfs_tree_read_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest)  in btrfs_tree_read_lock_nested()  argument
145 	down_read_nested(&eb->lock, nest);  in btrfs_tree_read_lock_nested()
146 	trace_btrfs_tree_read_lock(eb, start_ns);  in btrfs_tree_read_lock_nested()
154 bool btrfs_try_tree_read_lock(struct extent_buffer *eb)  in btrfs_try_tree_read_lock()  argument
156 	if (down_read_trylock(&eb->lock)) {  in btrfs_try_tree_read_lock()
157 		trace_btrfs_try_tree_read_lock(eb);  in btrfs_try_tree_read_lock()
166 void btrfs_tree_read_unlock(struct extent_buffer *eb)  in btrfs_tree_read_unlock()  argument
168 	trace_btrfs_tree_read_unlock(eb);  in btrfs_tree_read_unlock()
169 	up_read(&eb->lock);  in btrfs_tree_read_unlock()
173  * Lock eb for write.
175  * @eb:		the eb to lock
178  * Returns with the eb->lock write locked.
180 void btrfs_tree_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest)  in btrfs_tree_lock_nested()  argument
181 	__acquires(&eb->lock)  in btrfs_tree_lock_nested()
188 	down_write_nested(&eb->lock, nest);  in btrfs_tree_lock_nested()
189 	btrfs_set_eb_lock_owner(eb, current->pid);  in btrfs_tree_lock_nested()
190 	trace_btrfs_tree_lock(eb, start_ns);  in btrfs_tree_lock_nested()
196 void btrfs_tree_unlock(struct extent_buffer *eb)  in btrfs_tree_unlock()  argument
198 	trace_btrfs_tree_unlock(eb);  in btrfs_tree_unlock()
199 	btrfs_set_eb_lock_owner(eb, 0);  in btrfs_tree_unlock()
200 	up_write(&eb->lock);  in btrfs_tree_unlock()
237 	struct extent_buffer *eb;  in btrfs_lock_root_node()  local
240 		eb = btrfs_root_node(root);  in btrfs_lock_root_node()
242 		btrfs_maybe_reset_lockdep_class(root, eb);  in btrfs_lock_root_node()
243 		btrfs_tree_lock(eb);  in btrfs_lock_root_node()
244 		if (eb == root->node)  in btrfs_lock_root_node()
246 		btrfs_tree_unlock(eb);  in btrfs_lock_root_node()
247 		free_extent_buffer(eb);  in btrfs_lock_root_node()
249 	return eb;  in btrfs_lock_root_node()
260 	struct extent_buffer *eb;  in btrfs_read_lock_root_node()  local
263 		eb = btrfs_root_node(root);  in btrfs_read_lock_root_node()
265 		btrfs_maybe_reset_lockdep_class(root, eb);  in btrfs_read_lock_root_node()
266 		btrfs_tree_read_lock(eb);  in btrfs_read_lock_root_node()
267 		if (eb == root->node)  in btrfs_read_lock_root_node()
269 		btrfs_tree_read_unlock(eb);  in btrfs_read_lock_root_node()
270 		free_extent_buffer(eb);  in btrfs_read_lock_root_node()
272 	return eb;  in btrfs_read_lock_root_node()
284 	struct extent_buffer *eb;  in btrfs_try_read_lock_root_node()  local
287 		eb = btrfs_root_node(root);  in btrfs_try_read_lock_root_node()
288 		if (!btrfs_try_tree_read_lock(eb)) {  in btrfs_try_read_lock_root_node()
289 			free_extent_buffer(eb);  in btrfs_try_read_lock_root_node()
292 		if (eb == root->node)  in btrfs_try_read_lock_root_node()
294 		btrfs_tree_read_unlock(eb);  in btrfs_try_read_lock_root_node()
295 		free_extent_buffer(eb);  in btrfs_try_read_lock_root_node()
297 	return eb;  in btrfs_try_read_lock_root_node()