linux-master/lib/ref_tracker.c

16 	struct list_head	head;   /* anchor into dir->list or dir->quarantine */
32 ref_tracker_get_stats(struct ref_tracker_dir *dir, unsigned int limit)
44 	list_for_each_entry(tracker, &dir->list, head) {
84 __ref_tracker_dir_pr_ostream(struct ref_tracker_dir *dir,
92 	lockdep_assert_held(&dir->lock);
94 	if (list_empty(&dir->list))
97 	stats = ref_tracker_get_stats(dir, display_limit);
100 			   dir->name, dir, stats);
110 		pr_ostream(s, "%s@%pK has %d/%d users at\n%s\n", dir->name, dir,
117 			   dir->name, dir, skipped, stats->total);
124 void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
129 	__ref_tracker_dir_pr_ostream(dir, display_limit, &os);
133 void ref_tracker_dir_print(struct ref_tracker_dir *dir,
138 	spin_lock_irqsave(&dir->lock, flags);
139 	ref_tracker_dir_print_locked(dir, display_limit);
140 	spin_unlock_irqrestore(&dir->lock, flags);
144 int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size)
149 	spin_lock_irqsave(&dir->lock, flags);
150 	__ref_tracker_dir_pr_ostream(dir, 16, &os);
151 	spin_unlock_irqrestore(&dir->lock, flags);
157 void ref_tracker_dir_exit(struct ref_tracker_dir *dir)
163 	dir->dead = true;
164 	spin_lock_irqsave(&dir->lock, flags);
165 	list_for_each_entry_safe(tracker, n, &dir->quarantine, head) {
168 		dir->quarantine_avail++;
170 	if (!list_empty(&dir->list)) {
171 		ref_tracker_dir_print_locked(dir, 16);
173 		list_for_each_entry_safe(tracker, n, &dir->list, head) {
178 	spin_unlock_irqrestore(&dir->lock, flags);
180 	WARN_ON_ONCE(refcount_read(&dir->untracked) != 1);
181 	WARN_ON_ONCE(refcount_read(&dir->no_tracker) != 1);
185 int ref_tracker_alloc(struct ref_tracker_dir *dir,
195 	WARN_ON_ONCE(dir->dead);
198 		refcount_inc(&dir->no_tracker);
206 		refcount_inc(&dir->untracked);
212 	spin_lock_irqsave(&dir->lock, flags);
213 	list_add(&tracker->head, &dir->list);
214 	spin_unlock_irqrestore(&dir->lock, flags);
219 int ref_tracker_free(struct ref_tracker_dir *dir,
228 	WARN_ON_ONCE(dir->dead);
231 		refcount_dec(&dir->no_tracker);
236 		refcount_dec(&dir->untracked);
243 	spin_lock_irqsave(&dir->lock, flags);
254 		spin_unlock_irqrestore(&dir->lock, flags);
262 	list_move_tail(&tracker->head, &dir->quarantine);
263 	if (!dir->quarantine_avail) {
264 		tracker = list_first_entry(&dir->quarantine, struct ref_tracker, head);
267 		dir->quarantine_avail--;
270 	spin_unlock_irqrestore(&dir->lock, flags);