1 files changed, 51 insertions, 0 deletions
diff --git a/fs/bcachefs/errcode.c b/fs/bcachefs/errcode.c
new file mode 100644
index 000000000000..9da8a5973af0
--- /dev/null
+++ b/fs/bcachefs/errcode.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "bcachefs.h"
+#include "errcode.h"
+
+#include <linux/errname.h>
+
+static const char * const bch2_errcode_strs[] = {
+#define x(class, err) [BCH_ERR_##err - BCH_ERR_START] = #err,
+	BCH_ERRCODES()
+#undef x
+	NULL
+};
+
+#define BCH_ERR_0	0
+
+static unsigned bch2_errcode_parents[] = {
+#define x(class, err) [BCH_ERR_##err - BCH_ERR_START] = BCH_ERR_##class,
+	BCH_ERRCODES()
+#undef x
+};
+
+const char *bch2_err_str(int err)
+{
+	const char *errstr;
+	err = abs(err);
+
+	BUG_ON(err >= BCH_ERR_MAX);
+
+	if (err >= BCH_ERR_START)
+		errstr = bch2_errcode_strs[err - BCH_ERR_START];
+	else if (err)
+		errstr = errname(err);
+	else
+		errstr = "(No error)";
+	return errstr ?: "(Invalid error)";
+}
+
+bool __bch2_err_matches(int err, int class)
+{
+	err	= abs(err);
+	class	= abs(class);
+
+	BUG_ON(err	>= BCH_ERR_MAX);
+	BUG_ON(class	>= BCH_ERR_MAX);
+
+	while (err >= BCH_ERR_START && err != class)
+		err = bch2_errcode_parents[err - BCH_ERR_START];
+
+	return err == class;
+}