FS_IN_IGNORED
if (old->mask & FS_IN_IGNORED)
inotify_handle_inode_event(fsn_mark, FS_IN_IGNORED, NULL, NULL, NULL,
BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED);
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
amark->mark.mask = FS_IN_IGNORED;