MNTK_SHARED_WRITES
(MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED |
(ump->um_uppermp->mnt_kern_flag & MNTK_SHARED_WRITES);
MNT_KERN_FLAG(MNTK_SHARED_WRITES);
return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);