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 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS 26 /* 27 * Structure for permission fanotify events. It gets allocated and freed in 28 * fanotify_handle_event() since we wait there for user response. When the 29 * information is retrieved by userspace the structure is moved from 30 * group->notification_list to group->fanotify_data.access_list to wait for 31 * user response. 32 */ 33 struct fanotify_perm_event_info { 34 struct fanotify_event_info fae; 35 int response; /* userspace answer to question */ 36 int fd; /* fd we passed to userspace for this event */ 37 }; 38 39 static inline struct fanotify_perm_event_info * 40 FANOTIFY_PE(struct fsnotify_event *fse) 41 { 42 return container_of(fse, struct fanotify_perm_event_info, fae.fse); 43 } 44 #endif 45 46 static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse) 47 { 48 return container_of(fse, struct fanotify_event_info, fse); 49 } 50 51 struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask, 52 const struct path *path); 53