fsnotify: add super block object type

Add the infrastructure to attach a mark to a super_block struct
and detach all attached marks when super block is destroyed.

This is going to be used by fanotify backend to setup super block
marks.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 59cdb27826de..b5172ccb2e60 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -115,6 +115,8 @@ static __u32 *fsnotify_conn_mask_p(struct fsnotify_mark_connector *conn)
                 return &fsnotify_conn_inode(conn)->i_fsnotify_mask;
         else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
                 return &fsnotify_conn_mount(conn)->mnt_fsnotify_mask;
+        else if (conn->type == FSNOTIFY_OBJ_TYPE_SB)
+                return &fsnotify_conn_sb(conn)->s_fsnotify_mask;
         return NULL;
 }
 
@@ -192,6 +194,8 @@ static struct inode *fsnotify_detach_connector_from_object(
                 inode->i_fsnotify_mask = 0;
         } else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
                 fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0;
+        } else if (conn->type == FSNOTIFY_OBJ_TYPE_SB) {
+                fsnotify_conn_sb(conn)->s_fsnotify_mask = 0;
         }
 
         rcu_assign_pointer(*(conn->obj), NULL);