fs/notify/fanotify/fanotify.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/fsnotify_backend.h>
   3 #include <linux/path.h>
   4 #include <linux/slab.h>
   5
   6 extern struct kmem_cache *fanotify_mark_cache;
   7 extern struct kmem_cache *fanotify_event_cachep;
   8 extern struct kmem_cache *fanotify_perm_event_cachep;
   9
  10 /*
  11  * Structure for normal fanotify events. It gets allocated in
  12  * fanotify_handle_event() and freed when the information is retrieved by
  13  * userspace
  14  */
  15 struct fanotify_event_info {
  16         struct fsnotify_event fse;
  17         /*
  18          * We hold ref to this path so it may be dereferenced at any point
  19          * during this object's lifetime
  20          */
  21         struct path path;
  22         struct pid *tgid;
  23 };
  24
  25 /*
  26  * Structure for permission fanotify events. It gets allocated and freed in
  27  * fanotify_handle_event() since we wait there for user response. When the
  28  * information is retrieved by userspace the structure is moved from
  29  * group->notification_list to group->fanotify_data.access_list to wait for
  30  * user response.
  31  */
  32 struct fanotify_perm_event_info {
  33         struct fanotify_event_info fae;
  34         int response;   /* userspace answer to question */
  35         int fd;         /* fd we passed to userspace for this event */
  36 };
  37
  38 static inline struct fanotify_perm_event_info *
  39 FANOTIFY_PE(struct fsnotify_event *fse)
  40 {
  41         return container_of(fse, struct fanotify_perm_event_info, fae.fse);
  42 }
  43
  44 static inline bool fanotify_is_perm_event(u32 mask)
  45 {
  46         return IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS) &&
  47                 mask & FAN_ALL_PERM_EVENTS;
  48 }
  49
  50 static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse)
  51 {
  52         return container_of(fse, struct fanotify_event_info, fse);
  53 }
  54
  55 struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
  56                                                  struct inode *inode, u32 mask,
  57                                                  const struct path *path);