--- zzzz-none-000/linux-3.10.107/fs/notify/dnotify/dnotify.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/notify/dnotify/dnotify.c	2021-02-04 17:41:59.000000000 +0000
@@ -31,7 +31,6 @@
 static struct kmem_cache *dnotify_struct_cache __read_mostly;
 static struct kmem_cache *dnotify_mark_cache __read_mostly;
 static struct fsnotify_group *dnotify_group __read_mostly;
-static DEFINE_MUTEX(dnotify_mark_mutex);
 
 /*
  * dnotify will attach one of these to each inode (i_fsnotify_marks) which
@@ -70,8 +69,8 @@
 	if (old_mask == new_mask)
 		return;
 
-	if (fsn_mark->i.inode)
-		fsnotify_recalc_inode_mask(fsn_mark->i.inode);
+	if (fsn_mark->inode)
+		fsnotify_recalc_inode_mask(fsn_mark->inode);
 }
 
 /*
@@ -83,20 +82,23 @@
  * events.
  */
 static int dnotify_handle_event(struct fsnotify_group *group,
+				struct inode *inode,
 				struct fsnotify_mark *inode_mark,
 				struct fsnotify_mark *vfsmount_mark,
-				struct fsnotify_event *event)
+				u32 mask, void *data, int data_type,
+				const unsigned char *file_name, u32 cookie)
 {
 	struct dnotify_mark *dn_mark;
-	struct inode *to_tell;
 	struct dnotify_struct *dn;
 	struct dnotify_struct **prev;
 	struct fown_struct *fown;
-	__u32 test_mask = event->mask & ~FS_EVENT_ON_CHILD;
+	__u32 test_mask = mask & ~FS_EVENT_ON_CHILD;
 
-	BUG_ON(vfsmount_mark);
+	/* not a dir, dnotify doesn't care */
+	if (!S_ISDIR(inode->i_mode))
+		return 0;
 
-	to_tell = event->to_tell;
+	BUG_ON(vfsmount_mark);
 
 	dn_mark = container_of(inode_mark, struct dnotify_mark, fsn_mark);
 
@@ -123,23 +125,6 @@
 	return 0;
 }
 
-/*
- * Given an inode and mask determine if dnotify would be interested in sending
- * userspace notification for that pair.
- */
-static bool dnotify_should_send_event(struct fsnotify_group *group,
-				      struct inode *inode,
-				      struct fsnotify_mark *inode_mark,
-				      struct fsnotify_mark *vfsmount_mark,
-				      __u32 mask, void *data, int data_type)
-{
-	/* not a dir, dnotify doesn't care */
-	if (!S_ISDIR(inode->i_mode))
-		return false;
-
-	return true;
-}
-
 static void dnotify_free_mark(struct fsnotify_mark *fsn_mark)
 {
 	struct dnotify_mark *dn_mark = container_of(fsn_mark,
@@ -153,10 +138,6 @@
 
 static struct fsnotify_ops dnotify_fsnotify_ops = {
 	.handle_event = dnotify_handle_event,
-	.should_send_event = dnotify_should_send_event,
-	.free_group_priv = NULL,
-	.freeing_mark = NULL,
-	.free_event_priv = NULL,
 };
 
 /*
@@ -173,6 +154,7 @@
 	struct dnotify_struct *dn;
 	struct dnotify_struct **prev;
 	struct inode *inode;
+	bool free = false;
 
 	inode = file_inode(filp);
 	if (!S_ISDIR(inode->i_mode))
@@ -183,7 +165,7 @@
 		return;
 	dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
 
-	mutex_lock(&dnotify_mark_mutex);
+	mutex_lock(&dnotify_group->mark_mutex);
 
 	spin_lock(&fsn_mark->lock);
 	prev = &dn_mark->dn;
@@ -199,12 +181,17 @@
 
 	spin_unlock(&fsn_mark->lock);
 
-	/* nothing else could have found us thanks to the dnotify_mark_mutex */
-	if (dn_mark->dn == NULL)
-		fsnotify_destroy_mark(fsn_mark, dnotify_group);
+	/* nothing else could have found us thanks to the dnotify_groups
+	   mark_mutex */
+	if (dn_mark->dn == NULL) {
+		fsnotify_detach_mark(fsn_mark);
+		free = true;
+	}
 
-	mutex_unlock(&dnotify_mark_mutex);
+	mutex_unlock(&dnotify_group->mark_mutex);
 
+	if (free)
+		fsnotify_free_mark(fsn_mark);
 	fsnotify_put_mark(fsn_mark);
 }
 
@@ -326,7 +313,7 @@
 	new_dn_mark->dn = NULL;
 
 	/* this is needed to prevent the fcntl/close race described below */
-	mutex_lock(&dnotify_mark_mutex);
+	mutex_lock(&dnotify_group->mark_mutex);
 
 	/* add the new_fsn_mark or find an old one. */
 	fsn_mark = fsnotify_find_inode_mark(dnotify_group, inode);
@@ -334,7 +321,8 @@
 		dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
 		spin_lock(&fsn_mark->lock);
 	} else {
-		fsnotify_add_mark(new_fsn_mark, dnotify_group, inode, NULL, 0);
+		fsnotify_add_mark_locked(new_fsn_mark, dnotify_group, inode,
+					 NULL, 0);
 		spin_lock(&new_fsn_mark->lock);
 		fsn_mark = new_fsn_mark;
 		dn_mark = new_dn_mark;
@@ -348,9 +336,9 @@
 
 	/* if (f != filp) means that we lost a race and another task/thread
 	 * actually closed the fd we are still playing with before we grabbed
-	 * the dnotify_mark_mutex and fsn_mark->lock.  Since closing the fd is the
-	 * only time we clean up the marks we need to get our mark off
-	 * the list. */
+	 * the dnotify_groups mark_mutex and fsn_mark->lock.  Since closing the
+	 * fd is the only time we clean up the marks we need to get our mark
+	 * off the list. */
 	if (f != filp) {
 		/* if we added ourselves, shoot ourselves, it's possible that
 		 * the flush actually did shoot this fsn_mark.  That's fine too
@@ -363,13 +351,7 @@
 		goto out;
 	}
 
-	error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
-	if (error) {
-		/* if we added, we must shoot */
-		if (dn_mark == new_dn_mark)
-			destroy = 1;
-		goto out;
-	}
+	__f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
 
 	error = attach_dn(dn, dn_mark, id, fd, filp, mask);
 	/* !error means that we attached the dn to the dn_mark, so don't free it */
@@ -385,9 +367,10 @@
 	spin_unlock(&fsn_mark->lock);
 
 	if (destroy)
-		fsnotify_destroy_mark(fsn_mark, dnotify_group);
-
-	mutex_unlock(&dnotify_mark_mutex);
+		fsnotify_detach_mark(fsn_mark);
+	mutex_unlock(&dnotify_group->mark_mutex);
+	if (destroy)
+		fsnotify_free_mark(fsn_mark);
 	fsnotify_put_mark(fsn_mark);
 out_err:
 	if (new_fsn_mark)