bcachefs: Fix build when CONFIG_UNICODE=n

94426e4, which added the killswitch for casefolding, accidentally
removed some of the ifdefs we need to avoid build errors.

It appears we need better build testing for different configurations, it
took two weeks for the robots to catch this one.

Fixes: 94426e4 ("bcachefs: opts.casefold_disabled")
Signed-off-by: Kent Overstreet <[email protected]>

Author: Kent Overstreet

fs/bcachefs/dirent.c

@@ -13,6 +13,7 @@
 
 #include <linux/dcache.h>
 
+#ifdef CONFIG_UNICODE
 int bch2_casefold(struct btree_trans *trans, const struct bch_hash_info *info,
 		  const struct qstr *str, struct qstr *out_cf)
 {
@@ -33,6 +34,7 @@ int bch2_casefold(struct btree_trans *trans, const struct bch_hash_info *info,
 	*out_cf = (struct qstr) QSTR_INIT(buf, ret);
 	return 0;
 }
+#endif
 
 static unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent d)
 {
@@ -254,6 +256,7 @@ int bch2_dirent_init_name(struct bch_fs *c,
 		if (!bch2_fs_casefold_enabled(c))
 			return -EOPNOTSUPP;
 
+#ifdef CONFIG_UNICODE
 		memcpy(&dirent->v.d_cf_name_block.d_names[0], name->name, name->len);
 
 		char *cf_out = &dirent->v.d_cf_name_block.d_names[name->len];
@@ -279,6 +282,7 @@ int bch2_dirent_init_name(struct bch_fs *c,
 		dirent->v.d_cf_name_block.d_cf_name_len = cpu_to_le16(cf_len);
 
 		EBUG_ON(bch2_dirent_get_casefold_name(dirent_i_to_s_c(dirent)).len != cf_len);
+#endif
 	}
 
 	unsigned u64s = dirent_val_u64s(name->len, cf_len);

fs/bcachefs/dirent.h

@@ -23,6 +23,7 @@ struct bch_fs;
 struct bch_hash_info;
 struct bch_inode_info;
 
+#ifdef CONFIG_UNICODE
 int bch2_casefold(struct btree_trans *, const struct bch_hash_info *,
 		  const struct qstr *, struct qstr *);
 
@@ -37,6 +38,14 @@ static inline int bch2_maybe_casefold(struct btree_trans *trans,
 		return bch2_casefold(trans, info, str, out_cf);
 	}
 }
+#else
+static inline int bch2_maybe_casefold(struct btree_trans *trans,
+				      const struct bch_hash_info *info,
+				      const struct qstr *str, struct qstr *out_cf)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 
 struct qstr bch2_dirent_get_name(struct bkey_s_c_dirent);