1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/fsnotify_backend.h> 3 #include <linux/inotify.h> 4 #include <linux/slab.h> /* struct kmem_cache */ 5 6 struct inotify_event_info { 7 struct fsnotify_event fse; 8 u32 mask; 9 int wd; 10 u32 sync_cookie; 11 int name_len; 12 char name[]; 13 }; 14 15 struct inotify_inode_mark { 16 struct fsnotify_mark fsn_mark; 17 int wd; 18 }; 19 20 static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse) 21 { 22 return container_of(fse, struct inotify_event_info, fse); 23 } 24 25 /* 26 * INOTIFY_USER_FLAGS represents all of the mask bits that we expose to 27 * userspace. There is at least one bit (FS_EVENT_ON_CHILD) which is 28 * used only internally to the kernel. 29 */ 30 #define INOTIFY_USER_MASK (IN_ALL_EVENTS) 31 32 static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark) 33 { 34 __u32 mask = fsn_mark->mask & INOTIFY_USER_MASK; 35 36 if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) 37 mask |= IN_EXCL_UNLINK; 38 if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT) 39 mask |= IN_ONESHOT; 40 41 return mask; 42 } 43 44 extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, 45 struct fsnotify_group *group); 46 extern int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, 47 u32 mask, struct inode *inode, 48 struct inode *dir, 49 const struct qstr *name, u32 cookie); 50 51 extern const struct fsnotify_ops inotify_fsnotify_ops; 52 extern struct kmem_cache *inotify_inode_mark_cachep; 53 54 #ifdef CONFIG_INOTIFY_USER 55 static inline void dec_inotify_instances(struct ucounts *ucounts) 56 { 57 dec_ucount(ucounts, UCOUNT_INOTIFY_INSTANCES); 58 } 59 60 static inline struct ucounts *inc_inotify_watches(struct ucounts *ucounts) 61 { 62 return inc_ucount(ucounts->ns, ucounts->uid, UCOUNT_INOTIFY_WATCHES); 63 } 64 65 static inline void dec_inotify_watches(struct ucounts *ucounts) 66 { 67 dec_ucount(ucounts, UCOUNT_INOTIFY_WATCHES); 68 } 69 #endif 70