MNT_SWAPPABLE
{ &ffs_vfsops, MOUNT_FFS, 1, 0, MNT_LOCAL | MNT_SWAPPABLE,
{ &ext2fs_vfsops, MOUNT_EXT2FS, 17, 0, MNT_LOCAL | MNT_SWAPPABLE,
{ &msdosfs_vfsops, MOUNT_MSDOS, 4, 0, MNT_LOCAL | MNT_SWAPPABLE,
{ &nfs_vfsops, MOUNT_NFS, 2, 0, MNT_SWAPPABLE,
(vp->v_mount->mnt_flag & MNT_SWAPPABLE) == 0) {
if (flags & MNT_SWAPPABLE) {
flags &= ~MNT_SWAPPABLE;