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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/include/linux/fsnotify_backend.h
....@@ -38,6 +38,7 @@
3838 #define FS_DELETE		0x00000200	/* Subfile was deleted */
3939 #define FS_DELETE_SELF		0x00000400	/* Self was deleted */
4040 #define FS_MOVE_SELF		0x00000800	/* Self was moved */
41
+#define FS_OPEN_EXEC		0x00001000	/* File was opened for exec */
4142 
4243 #define FS_UNMOUNT		0x00002000	/* inode on umount fs */
4344 #define FS_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
....@@ -45,36 +46,56 @@
4546 
4647 #define FS_OPEN_PERM		0x00010000	/* open event in an permission hook */
4748 #define FS_ACCESS_PERM		0x00020000	/* access event in a permissions hook */
49
+#define FS_OPEN_EXEC_PERM	0x00040000	/* open/exec event in a permission hook */
4850 
4951 #define FS_EXCL_UNLINK		0x04000000	/* do not send events if object is unlinked */
50
-#define FS_ISDIR		0x40000000	/* event occurred against dir */
51
-#define FS_IN_ONESHOT		0x80000000	/* only send event once */
52
+/*
53
+ * Set on inode mark that cares about things that happen to its children.
54
+ * Always set for dnotify and inotify.
55
+ * Set on inode/sb/mount marks that care about parent/name info.
56
+ */
57
+#define FS_EVENT_ON_CHILD	0x08000000
5258 
5359 #define FS_DN_RENAME		0x10000000	/* file renamed */
5460 #define FS_DN_MULTISHOT		0x20000000	/* dnotify multishot */
55
-
56
-/* This inode cares about things that happen to its children.  Always set for
57
- * dnotify and inotify. */
58
-#define FS_EVENT_ON_CHILD	0x08000000
59
-
60
-/* This is a list of all events that may get sent to a parernt based on fs event
61
- * happening to inodes inside that directory */
62
-#define FS_EVENTS_POSS_ON_CHILD   (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
63
-				   FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
64
-				   FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
65
-				   FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
61
+#define FS_ISDIR		0x40000000	/* event occurred against dir */
62
+#define FS_IN_ONESHOT		0x80000000	/* only send event once */
6663 
6764 #define FS_MOVE			(FS_MOVED_FROM | FS_MOVED_TO)
6865 
69
-#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
66
+/*
67
+ * Directory entry modification events - reported only to directory
68
+ * where entry is modified and not to a watching parent.
69
+ * The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
70
+ * when a directory entry inside a child subdir changes.
71
+ */
72
+#define ALL_FSNOTIFY_DIRENT_EVENTS	(FS_CREATE | FS_DELETE | FS_MOVE)
73
+
74
+#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
75
+				  FS_OPEN_EXEC_PERM)
76
+
77
+/*
78
+ * This is a list of all events that may get sent to a parent that is watching
79
+ * with flag FS_EVENT_ON_CHILD based on fs event on a child of that directory.
80
+ */
81
+#define FS_EVENTS_POSS_ON_CHILD   (ALL_FSNOTIFY_PERM_EVENTS | \
82
+				   FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
83
+				   FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | \
84
+				   FS_OPEN | FS_OPEN_EXEC)
85
+
86
+/*
87
+ * This is a list of all events that may get sent with the parent inode as the
88
+ * @to_tell argument of fsnotify().
89
+ * It may include events that can be sent to an inode/sb/mount mark, but cannot
90
+ * be sent to a parent watching children.
91
+ */
92
+#define FS_EVENTS_POSS_TO_PARENT (FS_EVENTS_POSS_ON_CHILD)
7093 
7194 /* Events that can be reported to backends */
72
-#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
73
-			     FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
74
-			     FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
75
-			     FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
76
-			     FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
77
-			     FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME)
95
+#define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
96
+			     FS_EVENTS_POSS_ON_CHILD | \
97
+			     FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
98
+			     FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED)
7899 
79100 /* Extra flags that may be reported with event or control handling of events */
80101 #define ALL_FSNOTIFY_FLAGS  (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
....@@ -96,18 +117,42 @@
96117  * these operations for each relevant group.
97118  *
98119  * handle_event - main call for a group to handle an fs event
120
+ * @group:	group to notify
121
+ * @mask:	event type and flags
122
+ * @data:	object that event happened on
123
+ * @data_type:	type of object for fanotify_data_XXX() accessors
124
+ * @dir:	optional directory associated with event -
125
+ *		if @file_name is not NULL, this is the directory that
126
+ *		@file_name is relative to
127
+ * @file_name:	optional file name associated with event
128
+ * @cookie:	inotify rename cookie
129
+ * @iter_info:	array of marks from this group that are interested in the event
130
+ *
131
+ * handle_inode_event - simple variant of handle_event() for groups that only
132
+ *		have inode marks and don't have ignore mask
133
+ * @mark:	mark to notify
134
+ * @mask:	event type and flags
135
+ * @inode:	inode that event happened on
136
+ * @dir:	optional directory associated with event -
137
+ *		if @file_name is not NULL, this is the directory that
138
+ *		@file_name is relative to.
139
+ * @file_name:	optional file name associated with event
140
+ * @cookie:	inotify rename cookie
141
+ *
99142  * free_group_priv - called when a group refcnt hits 0 to clean up the private union
100143  * freeing_mark - called when a mark is being destroyed for some reason.  The group
101
- * 		MUST be holding a reference on each mark and that reference must be
102
- * 		dropped in this function.  inotify uses this function to send
103
- * 		userspace messages that marks have been removed.
144
+ *		MUST be holding a reference on each mark and that reference must be
145
+ *		dropped in this function.  inotify uses this function to send
146
+ *		userspace messages that marks have been removed.
104147  */
105148 struct fsnotify_ops {
106
-	int (*handle_event)(struct fsnotify_group *group,
107
-			    struct inode *inode,
108
-			    u32 mask, const void *data, int data_type,
109
-			    const unsigned char *file_name, u32 cookie,
149
+	int (*handle_event)(struct fsnotify_group *group, u32 mask,
150
+			    const void *data, int data_type, struct inode *dir,
151
+			    const struct qstr *file_name, u32 cookie,
110152 			    struct fsnotify_iter_info *iter_info);
153
+	int (*handle_inode_event)(struct fsnotify_mark *mark, u32 mask,
154
+			    struct inode *inode, struct inode *dir,
155
+			    const struct qstr *file_name, u32 cookie);
111156 	void (*free_group_priv)(struct fsnotify_group *group);
112157 	void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
113158 	void (*free_event)(struct fsnotify_event *event);
....@@ -122,9 +167,7 @@
122167  */
123168 struct fsnotify_event {
124169 	struct list_head list;
125
-	/* inode may ONLY be dereferenced during handle_event(). */
126
-	struct inode *inode;	/* either the inode the event happened to or its parent */
127
-	u32 mask;		/* the type of access, bitwise OR for FS_* event types */
170
+	unsigned long objectid;	/* identifier for queue merges */
128171 };
129172 
130173 /*
....@@ -194,29 +237,58 @@
194237 			/* allows a group to block waiting for a userspace response */
195238 			struct list_head access_list;
196239 			wait_queue_head_t access_waitq;
197
-			int f_flags;
240
+			int flags;           /* flags from fanotify_init() */
241
+			int f_flags; /* event_f_flags from fanotify_init() */
198242 			unsigned int max_marks;
199243 			struct user_struct *user;
200
-			bool audit;
201244 		} fanotify_data;
202245 #endif /* CONFIG_FANOTIFY */
203246 	};
204247 };
205248 
206
-/* when calling fsnotify tell it if the data is a path or inode */
207
-#define FSNOTIFY_EVENT_NONE	0
208
-#define FSNOTIFY_EVENT_PATH	1
209
-#define FSNOTIFY_EVENT_INODE	2
249
+/* When calling fsnotify tell it if the data is a path or inode */
250
+enum fsnotify_data_type {
251
+	FSNOTIFY_EVENT_NONE,
252
+	FSNOTIFY_EVENT_PATH,
253
+	FSNOTIFY_EVENT_INODE,
254
+};
255
+
256
+static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
257
+{
258
+	switch (data_type) {
259
+	case FSNOTIFY_EVENT_INODE:
260
+		return (struct inode *)data;
261
+	case FSNOTIFY_EVENT_PATH:
262
+		return d_inode(((const struct path *)data)->dentry);
263
+	default:
264
+		return NULL;
265
+	}
266
+}
267
+
268
+static inline const struct path *fsnotify_data_path(const void *data,
269
+						    int data_type)
270
+{
271
+	switch (data_type) {
272
+	case FSNOTIFY_EVENT_PATH:
273
+		return data;
274
+	default:
275
+		return NULL;
276
+	}
277
+}
210278 
211279 enum fsnotify_obj_type {
212280 	FSNOTIFY_OBJ_TYPE_INODE,
281
+	FSNOTIFY_OBJ_TYPE_PARENT,
213282 	FSNOTIFY_OBJ_TYPE_VFSMOUNT,
283
+	FSNOTIFY_OBJ_TYPE_SB,
214284 	FSNOTIFY_OBJ_TYPE_COUNT,
215285 	FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
216286 };
217287 
218288 #define FSNOTIFY_OBJ_TYPE_INODE_FL	(1U << FSNOTIFY_OBJ_TYPE_INODE)
289
+#define FSNOTIFY_OBJ_TYPE_PARENT_FL	(1U << FSNOTIFY_OBJ_TYPE_PARENT)
219290 #define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL	(1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
291
+#define FSNOTIFY_OBJ_TYPE_SB_FL		(1U << FSNOTIFY_OBJ_TYPE_SB)
220292 #define FSNOTIFY_OBJ_ALL_TYPES_MASK	((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
221293 
222294 static inline bool fsnotify_valid_obj_type(unsigned int type)
....@@ -259,7 +331,9 @@
259331 }
260332 
261333 FSNOTIFY_ITER_FUNCS(inode, INODE)
334
+FSNOTIFY_ITER_FUNCS(parent, PARENT)
262335 FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
336
+FSNOTIFY_ITER_FUNCS(sb, SB)
263337 
264338 #define fsnotify_foreach_obj_type(type) \
265339 	for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
....@@ -272,14 +346,17 @@
272346 typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
273347 
274348 /*
275
- * Inode / vfsmount point to this structure which tracks all marks attached to
276
- * the inode / vfsmount. The reference to inode / vfsmount is held by this
349
+ * Inode/vfsmount/sb point to this structure which tracks all marks attached to
350
+ * the inode/vfsmount/sb. The reference to inode/vfsmount/sb is held by this
277351  * structure. We destroy this structure when there are no more marks attached
278352  * to it. The structure is protected by fsnotify_mark_srcu.
279353  */
280354 struct fsnotify_mark_connector {
281355 	spinlock_t lock;
282
-	unsigned int type;	/* Type of object [lock] */
356
+	unsigned short type;	/* Type of object [lock] */
357
+#define FSNOTIFY_CONN_FLAG_HAS_FSID	0x01
358
+	unsigned short flags;	/* flags [lock] */
359
+	__kernel_fsid_t fsid;	/* fsid of filesystem containing object */
283360 	union {
284361 		/* Object pointer [lock] */
285362 		fsnotify_connp_t *obj;
....@@ -335,12 +412,28 @@
335412 /* called from the vfs helpers */
336413 
337414 /* main fsnotify call to send events */
338
-extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
339
-		    const unsigned char *name, u32 cookie);
340
-extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
415
+extern int fsnotify(__u32 mask, const void *data, int data_type,
416
+		    struct inode *dir, const struct qstr *name,
417
+		    struct inode *inode, u32 cookie);
418
+extern int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
419
+			   int data_type);
341420 extern void __fsnotify_inode_delete(struct inode *inode);
342421 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
422
+extern void fsnotify_sb_delete(struct super_block *sb);
343423 extern u32 fsnotify_get_cookie(void);
424
+
425
+static inline __u32 fsnotify_parent_needed_mask(__u32 mask)
426
+{
427
+	/* FS_EVENT_ON_CHILD is set on marks that want parent/name info */
428
+	if (!(mask & FS_EVENT_ON_CHILD))
429
+		return 0;
430
+	/*
431
+	 * This object might be watched by a mark that cares about parent/name
432
+	 * info, does it care about the specific set of events that can be
433
+	 * reported with parent/name info?
434
+	 */
435
+	return mask & FS_EVENTS_POSS_TO_PARENT;
436
+}
344437 
345438 static inline int fsnotify_inode_watches_children(struct inode *inode)
346439 {
....@@ -407,6 +500,9 @@
407500 extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
408501 /* return AND dequeue the first event on the notification queue */
409502 extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
503
+/* Remove event queued in the notification list */
504
+extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
505
+					 struct fsnotify_event *event);
410506 
411507 /* functions used to manipulate the marks attached to inodes */
412508 
....@@ -419,28 +515,35 @@
419515 /* Find mark belonging to given group in the list of marks */
420516 extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
421517 						struct fsnotify_group *group);
518
+/* Get cached fsid of filesystem containing object */
519
+extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
520
+				  __kernel_fsid_t *fsid);
422521 /* attach the mark to the object */
423522 extern int fsnotify_add_mark(struct fsnotify_mark *mark,
424523 			     fsnotify_connp_t *connp, unsigned int type,
425
-			     int allow_dups);
524
+			     int allow_dups, __kernel_fsid_t *fsid);
426525 extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
427
-				    fsnotify_connp_t *connp, unsigned int type,
428
-				    int allow_dups);
526
+				    fsnotify_connp_t *connp,
527
+				    unsigned int type, int allow_dups,
528
+				    __kernel_fsid_t *fsid);
529
+
429530 /* attach the mark to the inode */
430531 static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
431532 					  struct inode *inode,
432533 					  int allow_dups)
433534 {
434535 	return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
435
-				 FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
536
+				 FSNOTIFY_OBJ_TYPE_INODE, allow_dups, NULL);
436537 }
437538 static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
438539 						 struct inode *inode,
439540 						 int allow_dups)
440541 {
441542 	return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
442
-					FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
543
+					FSNOTIFY_OBJ_TYPE_INODE, allow_dups,
544
+					NULL);
443545 }
546
+
444547 /* given a group and a mark, flag mark to be freed when all references are dropped */
445548 extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
446549 				  struct fsnotify_group *group);
....@@ -448,6 +551,8 @@
448551 extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
449552 /* free mark */
450553 extern void fsnotify_free_mark(struct fsnotify_mark *mark);
554
+/* Wait until all marks queued for destruction are destroyed */
555
+extern void fsnotify_wait_marks_destroyed(void);
451556 /* run all the marks in a group, and clear all of the marks attached to given object type */
452557 extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
453558 /* run all the marks in a group, and clear all of the vfsmount marks */
....@@ -460,25 +565,34 @@
460565 {
461566 	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
462567 }
568
+/* run all the marks in a group, and clear all of the sn marks */
569
+static inline void fsnotify_clear_sb_marks_by_group(struct fsnotify_group *group)
570
+{
571
+	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB_FL);
572
+}
463573 extern void fsnotify_get_mark(struct fsnotify_mark *mark);
464574 extern void fsnotify_put_mark(struct fsnotify_mark *mark);
465
-extern void fsnotify_unmount_inodes(struct super_block *sb);
466575 extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
467576 extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
468577 
469
-/* put here because inotify does some weird stuff when destroying watches */
470
-extern void fsnotify_init_event(struct fsnotify_event *event,
471
-				struct inode *to_tell, u32 mask);
578
+static inline void fsnotify_init_event(struct fsnotify_event *event,
579
+				       unsigned long objectid)
580
+{
581
+	INIT_LIST_HEAD(&event->list);
582
+	event->objectid = objectid;
583
+}
472584 
473585 #else
474586 
475
-static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
476
-			   const unsigned char *name, u32 cookie)
587
+static inline int fsnotify(__u32 mask, const void *data, int data_type,
588
+			   struct inode *dir, const struct qstr *name,
589
+			   struct inode *inode, u32 cookie)
477590 {
478591 	return 0;
479592 }
480593 
481
-static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
594
+static inline int __fsnotify_parent(struct dentry *dentry, __u32 mask,
595
+				  const void *data, int data_type)
482596 {
483597 	return 0;
484598 }
....@@ -489,6 +603,9 @@
489603 static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
490604 {}
491605 
606
+static inline void fsnotify_sb_delete(struct super_block *sb)
607
+{}
608
+
492609 static inline void fsnotify_update_flags(struct dentry *dentry)
493610 {}
494611