1 files changed, 46 insertions, 43 deletions

diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 70a8516b78bc..0b3e74935cb4 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -253,7 +253,7 @@ static int fsnotify_handle_inode_event(struct fsnotify_group *group,
 	if (WARN_ON_ONCE(!inode && !dir))
 		return 0;
 
-	if ((inode_mark->mask & FS_EXCL_UNLINK) &&
+	if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
 	    path && d_unlinked(path->dentry))
 		return 0;
 
@@ -290,22 +290,15 @@ static int fsnotify_handle_event(struct fsnotify_group *group, __u32 mask,
 	}
 
 	if (parent_mark) {
-		/*
-		 * parent_mark indicates that the parent inode is watching
-		 * children and interested in this event, which is an event
-		 * possible on child. But is *this mark* watching children and
-		 * interested in this event?
-		 */
-		if (parent_mark->mask & FS_EVENT_ON_CHILD) {
-			ret = fsnotify_handle_inode_event(group, parent_mark, mask,
-							  data, data_type, dir, name, 0);
-			if (ret)
-				return ret;
-		}
-		if (!inode_mark)
-			return 0;
+		ret = fsnotify_handle_inode_event(group, parent_mark, mask,
+						  data, data_type, dir, name, 0);
+		if (ret)
+			return ret;
 	}
 
+	if (!inode_mark)
+		return 0;
+
 	if (mask & FS_EVENT_ON_CHILD) {
 		/*
 		 * Some events can be sent on both parent dir and child marks
@@ -335,31 +328,23 @@ static int send_to_group(__u32 mask, const void *data, int data_type,
 	struct fsnotify_mark *mark;
 	int type;
 
-	if (WARN_ON(!iter_info->report_mask))
+	if (!iter_info->report_mask)
 		return 0;
 
 	/* clear ignored on inode modification */
 	if (mask & FS_MODIFY) {
-		fsnotify_foreach_iter_type(type) {
-			if (!fsnotify_iter_should_report_type(iter_info, type))
-				continue;
-			mark = iter_info->marks[type];
-			if (mark &&
-			    !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
+		fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
+			if (!(mark->flags &
+			      FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
 				mark->ignored_mask = 0;
 		}
 	}
 
-	fsnotify_foreach_iter_type(type) {
-		if (!fsnotify_iter_should_report_type(iter_info, type))
-			continue;
-		mark = iter_info->marks[type];
-		/* does the object mark tell us to do something? */
-		if (mark) {
-			group = mark->group;
-			marks_mask |= mark->mask;
-			marks_ignored_mask |= mark->ignored_mask;
-		}
+	/* Are any of the group marks interested in this event? */
+	fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
+		group = mark->group;
+		marks_mask |= mark->mask;
+		marks_ignored_mask |= mark->ignored_mask;
 	}
 
 	pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignored_mask=%x data=%p data_type=%d dir=%p cookie=%d\n",
@@ -403,11 +388,11 @@ static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark)
 
 /*
  * iter_info is a multi head priority queue of marks.
- * Pick a subset of marks from queue heads, all with the
- * same group and set the report_mask for selected subset.
- * Returns the report_mask of the selected subset.
+ * Pick a subset of marks from queue heads, all with the same group
+ * and set the report_mask to a subset of the selected marks.
+ * Returns false if there are no more groups to iterate.
  */
-static unsigned int fsnotify_iter_select_report_types(
+static bool fsnotify_iter_select_report_types(
 		struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_group *max_prio_group = NULL;
@@ -423,30 +408,48 @@ static unsigned int fsnotify_iter_select_report_types(
 	}
 
 	if (!max_prio_group)
-		return 0;
+		return false;
 
 	/* Set the report mask for marks from same group as max prio group */
+	iter_info->current_group = max_prio_group;
 	iter_info->report_mask = 0;
 	fsnotify_foreach_iter_type(type) {
 		mark = iter_info->marks[type];
-		if (mark &&
-		    fsnotify_compare_groups(max_prio_group, mark->group) == 0)
+		if (mark && mark->group == iter_info->current_group) {
+			/*
+			 * FSNOTIFY_ITER_TYPE_PARENT indicates that this inode
+			 * is watching children and interested in this event,
+			 * which is an event possible on child.
+			 * But is *this mark* watching children?
+			 */
+			if (type == FSNOTIFY_ITER_TYPE_PARENT &&
+			    !(mark->mask & FS_EVENT_ON_CHILD))
+				continue;
+
 			fsnotify_iter_set_report_type(iter_info, type);
+		}
 	}
 
-	return iter_info->report_mask;
+	return true;
 }
 
 /*
- * Pop from iter_info multi head queue, the marks that were iterated in the
+ * Pop from iter_info multi head queue, the marks that belong to the group of
  * current iteration step.
  */
 static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
 {
+	struct fsnotify_mark *mark;
 	int type;
 
+	/*
+	 * We cannot use fsnotify_foreach_iter_mark_type() here because we
+	 * may need to advance a mark of type X that belongs to current_group
+	 * but was not selected for reporting.
+	 */
 	fsnotify_foreach_iter_type(type) {
-		if (fsnotify_iter_should_report_type(iter_info, type))
+		mark = iter_info->marks[type];
+		if (mark && mark->group == iter_info->current_group)
 			iter_info->marks[type] =
 				fsnotify_next_mark(iter_info->marks[type]);
 	}
@@ -581,7 +584,7 @@ static __init int fsnotify_init(void)
 {
 	int ret;
 
-	BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
+	BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
 
 	ret = init_srcu_struct(&fsnotify_mark_srcu);
 	if (ret)