bcachefs: Replace div_u64 with div64_u64 where second param is u64

Bcachefs often uses this function to divide by nanosecond times - which
can easily cause problems when cast to u32.  For example, `cat
/sys/fs/bcachefs/*/internal/rebalance_status` would return invalid data
in the `duration waited` field because dividing by the number of
nanoseconds in a minute requires the divisor parameter to be u64.
Signed-off-by: Reed Riley <reed@riley.engineer>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/sysfs.c

@@ -288,7 +288,7 @@ static int bch2_compression_stats_to_text(struct printbuf *out, struct bch_fs *c
 		prt_tab_rjust(out);
 
 		prt_human_readable_u64(out, nr_extents
-				       ? div_u64(sectors_uncompressed << 9, nr_extents)
+				       ? div64_u64(sectors_uncompressed << 9, nr_extents)
 				       : 0);
 		prt_tab_rjust(out);
 		prt_newline(out);

fs/bcachefs/util.c

@@ -64,7 +64,7 @@ static int bch2_pow(u64 n, u64 p, u64 *res)
 	*res = 1;
 
 	while (p--) {
-		if (*res > div_u64(U64_MAX, n))
+		if (*res > div64_u64(U64_MAX, n))
 			return -ERANGE;
 		*res *= n;
 	}
@@ -140,14 +140,14 @@ static int __bch2_strtou64_h(const char *cp, u64 *res)
 
 	parse_or_ret(cp, parse_unit_suffix(cp, &b));
 
-	if (v > div_u64(U64_MAX, b))
+	if (v > div64_u64(U64_MAX, b))
 		return -ERANGE;
 	v *= b;
 
-	if (f_n > div_u64(U64_MAX, b))
+	if (f_n > div64_u64(U64_MAX, b))
 		return -ERANGE;
 
-	f_n = div_u64(f_n * b, f_d);
+	f_n = div64_u64(f_n * b, f_d);
 	if (v + f_n < v)
 		return -ERANGE;
 	v += f_n;
@@ -477,7 +477,7 @@ void bch2_time_stats_to_text(struct printbuf *out, struct bch2_time_stats *stats
 			bool is_last = eytzinger0_next(i, NR_QUANTILES) == -1;
 
 			u64 q = max(quantiles->entries[i].m, last_q);
-			prt_printf(out, "%llu ", div_u64(q, u->nsecs));
+			prt_printf(out, "%llu ", div64_u64(q, u->nsecs));
 			if (is_last)
 				prt_newline(out);
 			last_q = q;