fanotify: permissions and blocking

This is the backend work needed for fanotify to support the new
FS_OPEN_PERM and FS_ACCESS_PERM fsnotify events.  This is done using the
new fsnotify secondary queue.  No userspace interface is provided actually
respond to or request these events.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 84d3e2047de..09d9bdb62af 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -482,6 +482,11 @@ SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags,
                 return PTR_ERR(group);
 
         group->priority = priority;
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+        mutex_init(&group->fanotify_data.access_mutex);
+        init_waitqueue_head(&group->fanotify_data.access_waitq);
+        INIT_LIST_HEAD(&group->fanotify_data.access_list);
+#endif
 
         fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);
         if (fd < 0)