Merge tag 'fsnotify_for_v5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull fanotify updates from Jan Kara:
 "Support for new FAN_RENAME fanotify event and support for reporting
  child info in directory fanotify events (FAN_REPORT_TARGET_FID)"

* tag 'fsnotify_for_v5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  fanotify: wire up FAN_RENAME event
  fanotify: report old and/or new parent+name in FAN_RENAME event
  fanotify: record either old name new name or both for FAN_RENAME
  fanotify: record old and new parent and name in FAN_RENAME event
  fanotify: support secondary dir fh and name in fanotify_info
  fanotify: use helpers to parcel fanotify_info buffer
  fanotify: use macros to get the offset to fanotify_info buffer
  fsnotify: generate FS_RENAME event with rich information
  fanotify: introduce group flag FAN_REPORT_TARGET_FID
  fsnotify: separate mark iterator type from object type enum
  fsnotify: clarify object type argument

5 files changed, 65 insertions, 37 deletions

diff --git a/include/linux/dnotify.h b/include/linux/dnotify.h
index 0aad774beaec..b87c3b85a166 100644
--- a/include/linux/dnotify.h
+++ b/include/linux/dnotify.h
@@ -26,7 +26,7 @@ struct dnotify_struct {
 			    FS_MODIFY | FS_MODIFY_CHILD |\
 			    FS_ACCESS | FS_ACCESS_CHILD |\
 			    FS_ATTRIB | FS_ATTRIB_CHILD |\
-			    FS_CREATE | FS_DN_RENAME |\
+			    FS_CREATE | FS_RENAME |\
 			    FS_MOVED_FROM | FS_MOVED_TO)
 
 extern int dir_notify_enable;
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 616af2ea20f3..3afdf339d53c 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -25,7 +25,7 @@ extern struct ctl_table fanotify_table[]; /* for sysctl */
 
 #define FANOTIFY_CLASS_BITS	(FAN_CLASS_NOTIF | FANOTIFY_PERM_CLASSES)
 
-#define FANOTIFY_FID_BITS	(FAN_REPORT_FID | FAN_REPORT_DFID_NAME)
+#define FANOTIFY_FID_BITS	(FAN_REPORT_DFID_NAME_TARGET)
 
 #define FANOTIFY_INFO_MODES	(FANOTIFY_FID_BITS | FAN_REPORT_PIDFD)
 
@@ -82,7 +82,8 @@ extern struct ctl_table fanotify_table[]; /* for sysctl */
  * Directory entry modification events - reported only to directory
  * where entry is modified and not to a watching parent.
  */
-#define FANOTIFY_DIRENT_EVENTS	(FAN_MOVE | FAN_CREATE | FAN_DELETE)
+#define FANOTIFY_DIRENT_EVENTS	(FAN_MOVE | FAN_CREATE | FAN_DELETE | \
+				 FAN_RENAME)
 
 /* Events that can be reported with event->fd */
 #define FANOTIFY_FD_EVENTS (FANOTIFY_PATH_EVENTS | FANOTIFY_PERM_EVENTS)
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 787545e87eeb..3a2d7dc3c607 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -144,16 +144,19 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 	u32 fs_cookie = fsnotify_get_cookie();
 	__u32 old_dir_mask = FS_MOVED_FROM;
 	__u32 new_dir_mask = FS_MOVED_TO;
+	__u32 rename_mask = FS_RENAME;
 	const struct qstr *new_name = &moved->d_name;
 
-	if (old_dir == new_dir)
-		old_dir_mask |= FS_DN_RENAME;
-
 	if (isdir) {
 		old_dir_mask |= FS_ISDIR;
 		new_dir_mask |= FS_ISDIR;
+		rename_mask |= FS_ISDIR;
 	}
 
+	/* Event with information about both old and new parent+name */
+	fsnotify_name(rename_mask, moved, FSNOTIFY_EVENT_DENTRY,
+		      old_dir, old_name, 0);
+
 	fsnotify_name(old_dir_mask, source, FSNOTIFY_EVENT_INODE,
 		      old_dir, old_name, fs_cookie);
 	fsnotify_name(new_dir_mask, source, FSNOTIFY_EVENT_INODE,
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 51ef2b079bfa..790c31844db5 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -63,7 +63,7 @@
  */
 #define FS_EVENT_ON_CHILD	0x08000000
 
-#define FS_DN_RENAME		0x10000000	/* file renamed */
+#define FS_RENAME		0x10000000	/* File was renamed */
 #define FS_DN_MULTISHOT		0x20000000	/* dnotify multishot */
 #define FS_ISDIR		0x40000000	/* event occurred against dir */
 #define FS_IN_ONESHOT		0x80000000	/* only send event once */
@@ -76,7 +76,7 @@
  * The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
  * when a directory entry inside a child subdir changes.
  */
-#define ALL_FSNOTIFY_DIRENT_EVENTS	(FS_CREATE | FS_DELETE | FS_MOVE)
+#define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE | FS_RENAME)
 
 #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
 				  FS_OPEN_EXEC_PERM)
@@ -101,7 +101,7 @@
 /* Events that can be reported to backends */
 #define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
 			     FS_EVENTS_POSS_ON_CHILD | \
-			     FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
+			     FS_DELETE_SELF | FS_MOVE_SELF | \
 			     FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
 			     FS_ERROR)
 
@@ -337,58 +337,69 @@ static inline struct fs_error_report *fsnotify_data_error_report(
 	}
 }
 
+/*
+ * Index to merged marks iterator array that correlates to a type of watch.
+ * The type of watched object can be deduced from the iterator type, but not
+ * the other way around, because an event can match different watched objects
+ * of the same object type.
+ * For example, both parent and child are watching an object of type inode.
+ */
+enum fsnotify_iter_type {
+	FSNOTIFY_ITER_TYPE_INODE,
+	FSNOTIFY_ITER_TYPE_VFSMOUNT,
+	FSNOTIFY_ITER_TYPE_SB,
+	FSNOTIFY_ITER_TYPE_PARENT,
+	FSNOTIFY_ITER_TYPE_INODE2,
+	FSNOTIFY_ITER_TYPE_COUNT
+};
+
+/* The type of object that a mark is attached to */
 enum fsnotify_obj_type {
+	FSNOTIFY_OBJ_TYPE_ANY = -1,
 	FSNOTIFY_OBJ_TYPE_INODE,
-	FSNOTIFY_OBJ_TYPE_PARENT,
 	FSNOTIFY_OBJ_TYPE_VFSMOUNT,
 	FSNOTIFY_OBJ_TYPE_SB,
 	FSNOTIFY_OBJ_TYPE_COUNT,
 	FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
 };
 
-#define FSNOTIFY_OBJ_TYPE_INODE_FL	(1U << FSNOTIFY_OBJ_TYPE_INODE)
-#define FSNOTIFY_OBJ_TYPE_PARENT_FL	(1U << FSNOTIFY_OBJ_TYPE_PARENT)
-#define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL	(1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
-#define FSNOTIFY_OBJ_TYPE_SB_FL		(1U << FSNOTIFY_OBJ_TYPE_SB)
-#define FSNOTIFY_OBJ_ALL_TYPES_MASK	((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
-
-static inline bool fsnotify_valid_obj_type(unsigned int type)
+static inline bool fsnotify_valid_obj_type(unsigned int obj_type)
 {
-	return (type < FSNOTIFY_OBJ_TYPE_COUNT);
+	return (obj_type < FSNOTIFY_OBJ_TYPE_COUNT);
 }
 
 struct fsnotify_iter_info {
-	struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
+	struct fsnotify_mark *marks[FSNOTIFY_ITER_TYPE_COUNT];
 	unsigned int report_mask;
 	int srcu_idx;
 };
 
 static inline bool fsnotify_iter_should_report_type(
-		struct fsnotify_iter_info *iter_info, int type)
+		struct fsnotify_iter_info *iter_info, int iter_type)
 {
-	return (iter_info->report_mask & (1U << type));
+	return (iter_info->report_mask & (1U << iter_type));
 }
 
 static inline void fsnotify_iter_set_report_type(
-		struct fsnotify_iter_info *iter_info, int type)
+		struct fsnotify_iter_info *iter_info, int iter_type)
 {
-	iter_info->report_mask |= (1U << type);
+	iter_info->report_mask |= (1U << iter_type);
 }
 
 static inline void fsnotify_iter_set_report_type_mark(
-		struct fsnotify_iter_info *iter_info, int type,
+		struct fsnotify_iter_info *iter_info, int iter_type,
 		struct fsnotify_mark *mark)
 {
-	iter_info->marks[type] = mark;
-	iter_info->report_mask |= (1U << type);
+	iter_info->marks[iter_type] = mark;
+	iter_info->report_mask |= (1U << iter_type);
 }
 
 #define FSNOTIFY_ITER_FUNCS(name, NAME) \
 static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
 		struct fsnotify_iter_info *iter_info) \
 { \
-	return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
-		iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
+	return (iter_info->report_mask & (1U << FSNOTIFY_ITER_TYPE_##NAME)) ? \
+		iter_info->marks[FSNOTIFY_ITER_TYPE_##NAME] : NULL; \
 }
 
 FSNOTIFY_ITER_FUNCS(inode, INODE)
@@ -396,8 +407,8 @@ FSNOTIFY_ITER_FUNCS(parent, PARENT)
 FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
 FSNOTIFY_ITER_FUNCS(sb, SB)
 
-#define fsnotify_foreach_obj_type(type) \
-	for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
+#define fsnotify_foreach_iter_type(type) \
+	for (type = 0; type < FSNOTIFY_ITER_TYPE_COUNT; type++)
 
 /*
  * fsnotify_connp_t is what we embed in objects which connector can be attached
@@ -604,11 +615,11 @@ extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
 				  __kernel_fsid_t *fsid);
 /* attach the mark to the object */
 extern int fsnotify_add_mark(struct fsnotify_mark *mark,
-			     fsnotify_connp_t *connp, unsigned int type,
+			     fsnotify_connp_t *connp, unsigned int obj_type,
 			     int allow_dups, __kernel_fsid_t *fsid);
 extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
 				    fsnotify_connp_t *connp,
-				    unsigned int type, int allow_dups,
+				    unsigned int obj_type, int allow_dups,
 				    __kernel_fsid_t *fsid);
 
 /* attach the mark to the inode */
@@ -637,22 +648,23 @@ extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
 extern void fsnotify_free_mark(struct fsnotify_mark *mark);
 /* Wait until all marks queued for destruction are destroyed */
 extern void fsnotify_wait_marks_destroyed(void);
-/* run all the marks in a group, and clear all of the marks attached to given object type */
-extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
+/* Clear all of the marks of a group attached to a given object type */
+extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group,
+					  unsigned int obj_type);
 /* run all the marks in a group, and clear all of the vfsmount marks */
 static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
 {
-	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
+	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT);
 }
 /* run all the marks in a group, and clear all of the inode marks */
 static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
 {
-	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
+	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE);
 }
 /* run all the marks in a group, and clear all of the sn marks */
 static inline void fsnotify_clear_sb_marks_by_group(struct fsnotify_group *group)
 {
-	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB_FL);
+	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB);
 }
 extern void fsnotify_get_mark(struct fsnotify_mark *mark);
 extern void fsnotify_put_mark(struct fsnotify_mark *mark);
diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index bd1932c2074d..e8ac38cc2fd6 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -28,6 +28,8 @@
 
 #define FAN_EVENT_ON_CHILD	0x08000000	/* Interested in child events */
 
+#define FAN_RENAME		0x10000000	/* File was renamed */
+
 #define FAN_ONDIR		0x40000000	/* Event occurred against dir */
 
 /* helper events */
@@ -57,9 +59,13 @@
 #define FAN_REPORT_FID		0x00000200	/* Report unique file id */
 #define FAN_REPORT_DIR_FID	0x00000400	/* Report unique directory id */
 #define FAN_REPORT_NAME		0x00000800	/* Report events with name */
+#define FAN_REPORT_TARGET_FID	0x00001000	/* Report dirent target id  */
 
 /* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */
 #define FAN_REPORT_DFID_NAME	(FAN_REPORT_DIR_FID | FAN_REPORT_NAME)
+/* Convenience macro - FAN_REPORT_TARGET_FID requires all other FID flags */
+#define FAN_REPORT_DFID_NAME_TARGET (FAN_REPORT_DFID_NAME | \
+				     FAN_REPORT_FID | FAN_REPORT_TARGET_FID)
 
 /* Deprecated - do not use this in programs and do not add new flags here! */
 #define FAN_ALL_INIT_FLAGS	(FAN_CLOEXEC | FAN_NONBLOCK | \
@@ -128,6 +134,12 @@ struct fanotify_event_metadata {
 #define FAN_EVENT_INFO_TYPE_PIDFD	4
 #define FAN_EVENT_INFO_TYPE_ERROR	5
 
+/* Special info types for FAN_RENAME */
+#define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME	10
+/* Reserved for FAN_EVENT_INFO_TYPE_OLD_DFID	11 */
+#define FAN_EVENT_INFO_TYPE_NEW_DFID_NAME	12
+/* Reserved for FAN_EVENT_INFO_TYPE_NEW_DFID	13 */
+
 /* Variable length info record following event metadata */
 struct fanotify_event_info_header {
 	__u8 info_type;