bcachefs: Fix 32 bit build

vstruct_bytes() was returning a u64 - it should be a size_t, the corect
type for the size of anything that fits in memory.

Also replace a 64 bit divide with div_u64().
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/journal_io.c

@@ -1105,7 +1105,7 @@ int bch2_journal_read(struct bch_fs *c, struct list_head *list,
 				struct journal_replay *p = list_prev_entry(i, list);
 
 				bch2_journal_ptrs_to_text(&out, c, p);
-				pr_buf(&out, " size %llu", vstruct_sectors(&p->j, c->block_bits));
+				pr_buf(&out, " size %zu", vstruct_sectors(&p->j, c->block_bits));
 			} else
 				sprintf(buf1, "(none)");
 			bch2_journal_ptrs_to_text(&PBUF(buf2), c, i);

fs/bcachefs/quota.c

@@ -23,7 +23,7 @@ static int bch2_sb_quota_validate(struct bch_sb *sb, struct bch_sb_field *f,
 	struct bch_sb_field_quota *q = field_to_type(f, quota);
 
 	if (vstruct_bytes(&q->field) < sizeof(*q)) {
-		pr_buf(err, "wrong size (got %llu should be %zu)",
+		pr_buf(err, "wrong size (got %zu should be %zu)",
 		       vstruct_bytes(&q->field), sizeof(*q));
 		return -EINVAL;
 	}

fs/bcachefs/super-io.c

@@ -1147,7 +1147,7 @@ static int bch2_sb_crypt_validate(struct bch_sb *sb,
 	struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
 
 	if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
-		pr_buf(err, "wrong size (got %llu should be %zu)",
+		pr_buf(err, "wrong size (got %zu should be %zu)",
 		       vstruct_bytes(&crypt->field), sizeof(*crypt));
 		return -EINVAL;
 	}
@@ -1390,7 +1390,7 @@ static int bch2_sb_clean_validate(struct bch_sb *sb,
 	struct bch_sb_field_clean *clean = field_to_type(f, clean);
 
 	if (vstruct_bytes(&clean->field) < sizeof(*clean)) {
-		pr_buf(err, "wrong size (got %llu should be %zu)",
+		pr_buf(err, "wrong size (got %zu should be %zu)",
 		       vstruct_bytes(&clean->field), sizeof(*clean));
 		return -EINVAL;
 	}
@@ -1467,7 +1467,7 @@ void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
 	else
 		pr_buf(out, "(unknown field %u)", type);
 
-	pr_buf(out, " (size %llu):", vstruct_bytes(f));
+	pr_buf(out, " (size %zu):", vstruct_bytes(f));
 	pr_newline(out);
 
 	if (ops && ops->to_text) {
@@ -1543,7 +1543,7 @@ void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 
 	pr_buf(out, "Created:                   ");
 	if (sb->time_base_lo)
-		pr_time(out, le64_to_cpu(sb->time_base_lo) / NSEC_PER_SEC);
+		pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
 	else
 		pr_buf(out, "(not set)");
 	pr_newline(out);
@@ -1649,7 +1649,7 @@ void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 	bch2_flags_to_text(out, bch2_sb_fields, fields_have);
 	pr_newline(out);
 
-	pr_buf(out, "Superblock size:           %llu", vstruct_bytes(sb));
+	pr_buf(out, "Superblock size:           %zu", vstruct_bytes(sb));
 	pr_newline(out);
 
 	if (print_layout) {

fs/bcachefs/vstructs.h

@@ -20,7 +20,7 @@
 ({									\
 	BUILD_BUG_ON(offsetof(_type, _data) % sizeof(u64));		\
 									\
-	(offsetof(_type, _data) + (_u64s) * sizeof(u64));		\
+	(size_t) (offsetof(_type, _data) + (_u64s) * sizeof(u64));	\
 })
 
 #define vstruct_bytes(_s)						\