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 inode *inode, u32 mask, 56 const struct path *path); 57