fanotify: factor out helpers to add/remove mark

Factor out helpers fanotify_add_mark() and fanotify_remove_mark()
to reduce duplicated code.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/notify/fanotify/fanotify_user.c

@@ -524,8 +524,8 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 	return mask & oldmask;
 }
 
-static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
-					 struct vfsmount *mnt, __u32 mask,
+static int fanotify_remove_mark(struct fsnotify_group *group,
+				fsnotify_connp_t *connp, __u32 mask,
 				unsigned int flags)
 {
 	struct fsnotify_mark *fsn_mark = NULL;
@@ -533,8 +533,7 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 	int destroy_mark;
 
 	mutex_lock(&group->mark_mutex);
-	fsn_mark = fsnotify_find_mark(&real_mount(mnt)->mnt_fsnotify_marks,
-				      group);
+	fsn_mark = fsnotify_find_mark(connp, group);
 	if (!fsn_mark) {
 		mutex_unlock(&group->mark_mutex);
 		return -ENOENT;
@@ -550,39 +549,25 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 	if (destroy_mark)
 		fsnotify_free_mark(fsn_mark);
 
+	/* matches the fsnotify_find_mark() */
 	fsnotify_put_mark(fsn_mark);
 	return 0;
 }
 
+static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
+					 struct vfsmount *mnt, __u32 mask,
+					 unsigned int flags)
+{
+	return fanotify_remove_mark(group, &real_mount(mnt)->mnt_fsnotify_marks,
+				    mask, flags);
+}
+
 static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 				      struct inode *inode, __u32 mask,
 				      unsigned int flags)
 {
-	struct fsnotify_mark *fsn_mark = NULL;
-	__u32 removed;
-	int destroy_mark;
-
-	mutex_lock(&group->mark_mutex);
-	fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
-	if (!fsn_mark) {
-		mutex_unlock(&group->mark_mutex);
-		return -ENOENT;
-	}
-
-	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
-						 &destroy_mark);
-	if (removed & fsnotify_conn_mask(fsn_mark->connector))
-		fsnotify_recalc_mask(fsn_mark->connector);
-	if (destroy_mark)
-		fsnotify_detach_mark(fsn_mark);
-	mutex_unlock(&group->mark_mutex);
-	if (destroy_mark)
-		fsnotify_free_mark(fsn_mark);
-
-	/* matches the fsnotify_find_mark() */
-	fsnotify_put_mark(fsn_mark);
-
-	return 0;
+	return fanotify_remove_mark(group, &inode->i_fsnotify_marks, mask,
+				    flags);
 }
 
 static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
@@ -639,19 +624,17 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
 }
 
 
-static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
-				      struct vfsmount *mnt, __u32 mask,
-				      unsigned int flags)
+static int fanotify_add_mark(struct fsnotify_group *group,
+			     fsnotify_connp_t *connp, unsigned int type,
+			     __u32 mask, unsigned int flags)
 {
-	fsnotify_connp_t *connp = &real_mount(mnt)->mnt_fsnotify_marks;
 	struct fsnotify_mark *fsn_mark;
 	__u32 added;
 
 	mutex_lock(&group->mark_mutex);
 	fsn_mark = fsnotify_find_mark(connp, group);
 	if (!fsn_mark) {
-		fsn_mark = fanotify_add_new_mark(group, connp,
-						 FSNOTIFY_OBJ_TYPE_VFSMOUNT);
+		fsn_mark = fanotify_add_new_mark(group, connp, type);
 		if (IS_ERR(fsn_mark)) {
 			mutex_unlock(&group->mark_mutex);
 			return PTR_ERR(fsn_mark);
@@ -666,14 +649,18 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
 	return 0;
 }
 
+static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
+				      struct vfsmount *mnt, __u32 mask,
+				      unsigned int flags)
+{
+	return fanotify_add_mark(group, &real_mount(mnt)->mnt_fsnotify_marks,
+				 FSNOTIFY_OBJ_TYPE_VFSMOUNT, mask, flags);
+}
+
 static int fanotify_add_inode_mark(struct fsnotify_group *group,
 				   struct inode *inode, __u32 mask,
 				   unsigned int flags)
 {
-	fsnotify_connp_t *connp = &inode->i_fsnotify_marks;
-	struct fsnotify_mark *fsn_mark;
-	__u32 added;
-
 	pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
 
 	/*
@@ -686,23 +673,8 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 	    (atomic_read(&inode->i_writecount) > 0))
 		return 0;
 
-	mutex_lock(&group->mark_mutex);
-	fsn_mark = fsnotify_find_mark(connp, group);
-	if (!fsn_mark) {
-		fsn_mark = fanotify_add_new_mark(group, connp,
-						 FSNOTIFY_OBJ_TYPE_INODE);
-		if (IS_ERR(fsn_mark)) {
-			mutex_unlock(&group->mark_mutex);
-			return PTR_ERR(fsn_mark);
-		}
-	}
-	added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
-	if (added & ~fsnotify_conn_mask(fsn_mark->connector))
-		fsnotify_recalc_mask(fsn_mark->connector);
-	mutex_unlock(&group->mark_mutex);
-
-	fsnotify_put_mark(fsn_mark);
-	return 0;
+	return fanotify_add_mark(group, &inode->i_fsnotify_marks,
+				 FSNOTIFY_OBJ_TYPE_INODE, mask, flags);
 }
 
 /* fanotify syscalls */