D21191.id60591.diff
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	Index: sbin/swapon/swapon.c
	===================================================================
	--- sbin/swapon/swapon.c
	+++ sbin/swapon/swapon.c
	@@ -761,8 +761,8 @@
	} else
	errx(1, "%s has an invalid file type", name);
	/* Trim the device. */
	- ioarg[0] = 0;
	- ioarg[1] = sz;
	+ ioarg[0] = BSD_LABEL_SIZE;
	+ ioarg[1] = sz - BSD_LABEL_SIZE;
	if (ioctl(fd, DIOCGDELETE, ioarg) != 0)
	warn("ioctl(DIOCGDELETE)");

	Index: sys/vm/swap_pager.c
	===================================================================
	--- sys/vm/swap_pager.c
	+++ sys/vm/swap_pager.c
	@@ -2298,10 +2298,10 @@

	sp->sw_blist = blist_create(nblks, M_WAITOK);
	/*
	- * Do not free the first two block in order to avoid overwriting
	+ * Do not free the first blocks in order to avoid overwriting
	* any bsd label at the front of the partition
	*/
	- blist_free(sp->sw_blist, 2, nblks - 2);
	+ blist_free(sp->sw_blist, BSD_LABEL_SIZE, nblks - BSD_LABEL_SIZE);

	dvbase = 0;
	mtx_lock(&sw_dev_mtx);
	@@ -2319,7 +2319,7 @@
	sp->sw_end = dvbase + nblks;
	TAILQ_INSERT_TAIL(&swtailq, sp, sw_list);
	nswapdev++;
	- swap_pager_avail += nblks - 2;
	+ swap_pager_avail += nblks - BSD_LABEL_SIZE;
	swap_total += nblks;
	swapon_check_swzone();
	swp_sizecheck();
	Index: sys/vm/vm_param.h
	===================================================================
	--- sys/vm/vm_param.h
	+++ sys/vm/vm_param.h
	@@ -122,6 +122,10 @@
	#endif /* !SMP */
	#endif /* !PA_LOCK_COUNT */

	+#ifndef BSD_LABEL_SIZE
	+#define BSD_LABEL_SIZE 2
	+#endif BSD_LABEL_SIZE
	+
	#ifndef KSTACK_MAX_PAGES
	#define KSTACK_MAX_PAGES 32
	#endif