inotify: tail drop inotify q_overflow events

In f44aebcc the tail drop logic of events with no file backing
(q_overflow and in_ignored) was reversed so IN_IGNORED events would
never be tail dropped.  This now means that Q_OVERFLOW events are NOT
tail dropped.  The fix is to not tail drop IN_IGNORED, but to tail drop
Q_OVERFLOW.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index 74b3cf30bc6b..3816d5750dd5 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -153,6 +153,10 @@ static bool event_compare(struct fsnotify_event *old, struct fsnotify_event *new
                                 return true;
                         break;
                 case (FSNOTIFY_EVENT_NONE):
+                        if (old->mask & FS_Q_OVERFLOW)
+                                return true;
+                        else if (old->mask & FS_IN_IGNORED)
+                                return false;
                         return false;
                 };
         }