MNTK_ASYNC
mp->mnt_kern_flag |= MNTK_ASYNC;
mp->mnt_kern_flag &= ~MNTK_ASYNC;
mp->mnt_kern_flag &= ~MNTK_ASYNC;
mp->mnt_kern_flag |= MNTK_ASYNC;
mp->mnt_kern_flag &= ~MNTK_ASYNC;
mp->mnt_kern_flag &= ~MNTK_ASYNC;
mp->mnt_kern_flag |= MNTK_ASYNC;
MNT_KERN_FLAG(MNTK_ASYNC);
(((vp)->v_mount->mnt_kern_flag & MNTK_ASYNC) != 0 && \
mp->mnt_kern_flag = (mp->mnt_kern_flag & ~MNTK_ASYNC) |