1 files changed, 23 insertions, 7 deletions

diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
index f2a4db3854d0..98727e2cf855 100644
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -367,16 +367,20 @@ restart:
 	 * Start packing more blocks into the cylinder group until
 	 * it cannot grow any larger, the number of cylinder groups
 	 * drops below MINCYLGRPS, or we reach the size requested.
+	 * For UFS1 inodes per cylinder group are stored in an int16_t
+	 * so fs_ipg is limited to 2^15 - 1.
 	 */
 	for ( ; sblock.fs_fpg < maxblkspercg; sblock.fs_fpg += sblock.fs_frag) {
 		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
 		    INOPB(&sblock));
-		if (sblock.fs_size / sblock.fs_fpg < MINCYLGRPS)
-			break;
-		if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
-			continue;
-		if (CGSIZE(&sblock) == (unsigned long)sblock.fs_bsize)
-			break;
+		if (Oflag > 1 || (Oflag == 1 && sblock.fs_ipg <= 0x7fff)) {
+			if (sblock.fs_size / sblock.fs_fpg < MINCYLGRPS)
+				break;
+			if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
+				continue;
+			if (CGSIZE(&sblock) == (unsigned long)sblock.fs_bsize)
+				break;
+		}
 		sblock.fs_fpg -= sblock.fs_frag;
 		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
 		    INOPB(&sblock));
@@ -568,8 +572,20 @@ restart:
 		printf("** Exiting on Eflag 3\n");
 		exit(0);
 	}
-	if (!Nflag)
+	if (!Nflag) {
 		sbwrite(&disk, 0);
+		/*
+		 * For UFS1 filesystems with a blocksize of 64K, the first
+		 * alternate superblock resides at the location used for
+		 * the default UFS2 superblock. As there is a valid
+		 * superblock at this location, the boot code will use
+		 * it as its first choice. Thus we have to ensure that
+		 * all of its statistcs on usage are correct.
+		 */
+		if (Oflag == 1 && sblock.fs_bsize == 65536)
+			wtfs(fsbtodb(&sblock, cgsblock(&sblock, 0)),
+			    sblock.fs_bsize, (char *)&sblock);
+	}
 	for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize)
 		wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)),
 			sblock.fs_cssize - i < sblock.fs_bsize ?