fsnotify: ignored_mask - excluding notification

The ignored_mask is a new mask which is part of fsnotify marks.  A group's
should_send_event() function can use the ignored mask to determine that
certain events are not of interest.  In particular if a group registers a
mask including FS_OPEN on a vfsmount they could add FS_OPEN to the
ignored_mask for individual inodes and not send open events for those
inodes.

Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 0ebc3fd7089b..cb1d822f227f 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -190,6 +190,12 @@ void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
                 fsnotify_set_inode_mark_mask_locked(mark, mask);
 }
 
+void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask)
+{
+        assert_spin_locked(&mark->lock);
+
+        mark->ignored_mask = mask;
+}
 
 /*
  * Attach an initialized mark to a given group and fs object.