bcachefs: Fix 32 bit build failures

This fix replaces multiple 64 bit divisions with do_div() equivalents.
Signed-off-by: Brett Holman <bholman.devel@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/buckets.c

@@ -670,7 +670,7 @@ static s64 ptr_disk_sectors(s64 sectors, struct extent_ptr_decoded p)
 
 	return p.crc.compression_type &&
 		p.crc.compression_type != BCH_COMPRESSION_TYPE_incompressible
-		? DIV_ROUND_UP(sectors * p.crc.compressed_size,
+		? DIV_ROUND_UP_ULL(sectors * p.crc.compressed_size,
 			       p.crc.uncompressed_size)
 		: sectors;
 }

fs/bcachefs/tests.c

@@ -778,7 +778,7 @@ static int btree_perf_test_thread(void *data)
 		wait_event(j->ready_wait, !atomic_read(&j->ready));
 	}
 
-	ret = j->fn(j->c, j->nr / j->nr_threads);
+	ret = j->fn(j->c, div64_u64(j->nr, j->nr_threads));
 	if (ret)
 		j->ret = ret;
 
@@ -854,11 +854,11 @@ int bch2_btree_perf_test(struct bch_fs *c, const char *testname,
 
 	scnprintf(name_buf, sizeof(name_buf), "%s:", testname);
 	bch2_hprint(&PBUF(nr_buf), nr);
-	bch2_hprint(&PBUF(per_sec_buf), nr * NSEC_PER_SEC / time);
+	bch2_hprint(&PBUF(per_sec_buf), div64_u64(nr * NSEC_PER_SEC, time));
 	printk(KERN_INFO "%-12s %s with %u threads in %5llu sec, %5llu nsec per iter, %5s per sec\n",
 		name_buf, nr_buf, nr_threads,
-		time / NSEC_PER_SEC,
-		time * nr_threads / nr,
+		div_u64(time, NSEC_PER_SEC),
+		div_u64(time * nr_threads, nr),
 		per_sec_buf);
 	return j.ret;
 }