include/linux/ref_tracker.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 #ifndef _LINUX_REF_TRACKER_H
   3 #define _LINUX_REF_TRACKER_H
   4 #include <linux/refcount.h>
   5 #include <linux/types.h>
   6 #include <linux/spinlock.h>
   7
   8 struct ref_tracker;
   9
  10 struct ref_tracker_dir {
  11 #ifdef CONFIG_REF_TRACKER
  12         spinlock_t              lock;
  13         unsigned int            quarantine_avail;
  14         refcount_t              untracked;
  15         struct list_head        list; /* List of active trackers */
  16         struct list_head        quarantine; /* List of dead trackers */
  17 #endif
  18 };
  19
  20 #ifdef CONFIG_REF_TRACKER
  21 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
  22                                         unsigned int quarantine_count)
  23 {
  24         INIT_LIST_HEAD(&dir->list);
  25         INIT_LIST_HEAD(&dir->quarantine);
  26         spin_lock_init(&dir->lock);
  27         dir->quarantine_avail = quarantine_count;
  28         refcount_set(&dir->untracked, 1);
  29 }
  30
  31 void ref_tracker_dir_exit(struct ref_tracker_dir *dir);
  32
  33 void ref_tracker_dir_print(struct ref_tracker_dir *dir,
  34                            unsigned int display_limit);
  35
  36 int ref_tracker_alloc(struct ref_tracker_dir *dir,
  37                       struct ref_tracker **trackerp, gfp_t gfp);
  38
  39 int ref_tracker_free(struct ref_tracker_dir *dir,
  40                      struct ref_tracker **trackerp);
  41
  42 #else /* CONFIG_REF_TRACKER */
  43
  44 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
  45                                         unsigned int quarantine_count)
  46 {
  47 }
  48
  49 static inline void ref_tracker_dir_exit(struct ref_tracker_dir *dir)
  50 {
  51 }
  52
  53 static inline void ref_tracker_dir_print(struct ref_tracker_dir *dir,
  54                                          unsigned int display_limit)
  55 {
  56 }
  57
  58 static inline int ref_tracker_alloc(struct ref_tracker_dir *dir,
  59                                     struct ref_tracker **trackerp,
  60                                     gfp_t gfp)
  61 {
  62         return 0;
  63 }
  64
  65 static inline int ref_tracker_free(struct ref_tracker_dir *dir,
  66                                    struct ref_tracker **trackerp)
  67 {
  68         return 0;
  69 }
  70
  71 #endif
  72
  73 #endif /* _LINUX_REF_TRACKER_H */