fanotify: drop the useless priority argument

The priority argument in fanotify is useless.  Kill it.
Signed-off-by: NEric Paris <eparis@redhat.com>

fs/notify/fanotify/fanotify_user.c

@@ -616,14 +616,13 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 }
 
 /* fanotify syscalls */
-SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags,
-		unsigned int, priority)
+SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
 {
 	struct fsnotify_group *group;
 	int f_flags, fd;
 
-	pr_debug("%s: flags=%d event_f_flags=%d priority=%d\n",
-		__func__, flags, event_f_flags, priority);
+	pr_debug("%s: flags=%d event_f_flags=%d\n",
+		__func__, flags, event_f_flags);
 
 	if (event_f_flags)
 		return -EINVAL;
@@ -645,7 +644,6 @@ SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags,
 	if (IS_ERR(group))
 		return PTR_ERR(group);
 
-	group->priority = priority;
 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
 	mutex_init(&group->fanotify_data.access_mutex);
 	init_waitqueue_head(&group->fanotify_data.access_waitq);

fs/notify/group.c

@@ -90,7 +90,6 @@ void fsnotify_recalc_group_mask(struct fsnotify_group *group)
 void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
 {
 	struct fsnotify_group *group_iter;
-	unsigned int priority = group->priority;
 
 	mutex_lock(&fsnotify_grp_mutex);
 
@@ -98,7 +97,7 @@ void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
 		list_for_each_entry(group_iter, &fsnotify_vfsmount_groups,
 				    vfsmount_group_list) {
 			/* insert in front of this one? */
-			if (priority < group_iter->priority) {
+			if (group < group_iter) {
 				/* list_add_tail() insert in front of group_iter */
 				list_add_tail_rcu(&group->inode_group_list,
 						  &group_iter->inode_group_list);
@@ -118,15 +117,14 @@ void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
 void fsnotify_add_inode_group(struct fsnotify_group *group)
 {
 	struct fsnotify_group *group_iter;
-	unsigned int priority = group->priority;
 
 	mutex_lock(&fsnotify_grp_mutex);
 
-	/* add to global group list, priority 0 first, UINT_MAX last */
+	/* add to global group list */
 	if (!group->on_inode_group_list) {
 		list_for_each_entry(group_iter, &fsnotify_inode_groups,
 				    inode_group_list) {
-			if (priority < group_iter->priority) {
+			if (group < group_iter) {
 				/* list_add_tail() insert in front of group_iter */
 				list_add_tail_rcu(&group->inode_group_list,
 						  &group_iter->inode_group_list);
@@ -260,8 +258,6 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
 	spin_lock_init(&group->mark_lock);
 	INIT_LIST_HEAD(&group->marks_list);
 
-	group->priority = UINT_MAX;
-
 	group->ops = ops;
 
 	return group;

include/linux/fsnotify_backend.h

@@ -143,7 +143,6 @@ struct fsnotify_group {
 					 * a group */
 	struct list_head marks_list;	/* all inode marks for this group */
 
-	unsigned int priority;		/* order of this group compared to others */
 	/* prevents double list_del of group_list.  protected by global fsnotify_grp_mutex */
 	bool on_inode_group_list;
 	bool on_vfsmount_group_list;

include/linux/syscalls.h

@@ -813,8 +813,7 @@ asmlinkage long sys_pselect6(int, fd_set __user *, fd_set __user *,
 asmlinkage long sys_ppoll(struct pollfd __user *, unsigned int,
 			  struct timespec __user *, const sigset_t __user *,
 			  size_t);
-asmlinkage long sys_fanotify_init(unsigned int flags, unsigned int event_f_flags,
-				  unsigned int priority);
+asmlinkage long sys_fanotify_init(unsigned int flags, unsigned int event_f_flags);
 asmlinkage long sys_fanotify_mark(int fanotify_fd, unsigned int flags,
 				  u64 mask, int fd,
 				  const char  __user *pathname);