make sure xfs_repair doesn't restore corrupted primary superblock

@@ -305,8 +305,9 @@ libxfs_getbuf(dev_t device, xfs_daddr_t 
 
 	if (cache_node_get(libxfs_bcache, &key, (struct cache_node **)&bp)) {
 #ifdef IO_DEBUG
-		fprintf(stderr, "%s: allocated buffer, key=%llu(%llu), %p\n",
-			__FUNCTION__, BBTOB(len), LIBXFS_BBTOOFF64(blkno), blkno, buf);
+		fprintf(stderr, "%s: allocated %ubytes buffer, key=%llu(%llu), %p\n",
+			__FUNCTION__, BBTOB(len),
+			(long long)LIBXFS_BBTOOFF64(blkno), (long long)blkno, bp);
 #endif
 		libxfs_initbuf(bp, device, blkno, bytes);
 	}

@@ -354,7 +355,7 @@ libxfs_readbufr(dev_t dev, xfs_daddr_t b
 	}
 #ifdef IO_DEBUG
 	fprintf(stderr, "readbufr read %ubytes, blkno=%llu(%llu), %p\n",
-		bytes, LIBXFS_BBTOOFF64(blkno), blkno, bp);
+		bytes, (long long)LIBXFS_BBTOOFF64(blkno), (long long)blkno, bp);
 #endif
 	if (bp->b_dev == dev &&
 	    bp->b_blkno == blkno &&

@@ -403,7 +404,8 @@ libxfs_writebufr(xfs_buf_t *bp)
 	}
 #ifdef IO_DEBUG
 	fprintf(stderr, "writebufr wrote %ubytes, blkno=%llu(%llu), %p\n",
-		bp->b_bcount, LIBXFS_BBTOOFF64(bp->b_blkno), bp->b_blkno, bp);
+		bp->b_bcount, (long long)LIBXFS_BBTOOFF64(bp->b_blkno),
+		(long long)bp->b_blkno, bp);
 #endif
 	bp->b_flags |= LIBXFS_B_UPTODATE;
 	bp->b_flags &= ~(LIBXFS_B_DIRTY | LIBXFS_B_EXIT);

@@ -432,7 +434,7 @@ libxfs_iomove(xfs_buf_t *bp, uint boff, 
 	if (boff + len > bp->b_bcount) {
 		fprintf(stderr, "Badness, iomove out of range!\n"
 			"bp=(bno %llu, bytes %u) range=(boff %u, bytes %u)\n",
-			bp->b_blkno, bp->b_bcount, boff, len);
+			(long long)bp->b_blkno, bp->b_bcount, boff, len);
 		abort();
 	}
 #endif

@@ -464,7 +466,7 @@ libxfs_bcache_purge(void)
 	cache_purge(libxfs_bcache);
 }
 
-void 
+void
 libxfs_bcache_flush(void)
 {
 	cache_flush(libxfs_bcache);

@@ -431,7 +431,7 @@ _("out-of-order bmap key (file offset) i
 	}
 
 	/*
-	 * If we're the last node at our level, check that the last child 
+	 * If we're the last node at our level, check that the last child
 	 * block's forward sibling pointer is NULL.
 	 */
 	if (check_dups == 0 &&

@@ -1295,6 +1295,8 @@ scan_ag(
 	ASSERT(sb_dirty == 0 || (sb_dirty && !no_modify));
 
 	if (sb_dirty && !no_modify) {
+		if (agno == 0)
+			memcpy(&mp->m_sb, sb, sizeof(xfs_sb_t));
 		libxfs_xlate_sb(XFS_BUF_PTR(sbbuf), sb, -1, XFS_SB_ALL_BITS);
 		libxfs_writebuf(sbbuf, 0);
 	} else