1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/errors.h b/drivers/md/dm-vdo/errors.h
new file mode 100644
index 000000000000..24e0e745fd5f
--- /dev/null
+++ b/drivers/md/dm-vdo/errors.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef UDS_ERRORS_H
+#define UDS_ERRORS_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+/* Custom error codes and error-related utilities */
+#define VDO_SUCCESS 0
+
+/* Valid status codes for internal UDS functions. */
+enum uds_status_codes {
+	/* Successful return */
+	UDS_SUCCESS = VDO_SUCCESS,
+	/* Used as a base value for reporting internal errors */
+	UDS_ERROR_CODE_BASE = 1024,
+	/* Index overflow */
+	UDS_OVERFLOW = UDS_ERROR_CODE_BASE,
+	/* Invalid argument passed to internal routine */
+	UDS_INVALID_ARGUMENT,
+	/* UDS data structures are in an invalid state */
+	UDS_BAD_STATE,
+	/* Attempt to enter the same name into an internal structure twice */
+	UDS_DUPLICATE_NAME,
+	/* An assertion failed */
+	UDS_ASSERTION_FAILED,
+	/* A request has been queued for later processing (not an error) */
+	UDS_QUEUED,
+	/* This error range has already been registered */
+	UDS_ALREADY_REGISTERED,
+	/* Attempt to read or write data outside the valid range */
+	UDS_OUT_OF_RANGE,
+	/* The index session is disabled */
+	UDS_DISABLED,
+	/* The index configuration or volume format is no longer supported */
+	UDS_UNSUPPORTED_VERSION,
+	/* Some index structure is corrupt */
+	UDS_CORRUPT_DATA,
+	/* No index state found */
+	UDS_NO_INDEX,
+	/* Attempt to access incomplete index save data */
+	UDS_INDEX_NOT_SAVED_CLEANLY,
+	/* One more than the last UDS_INTERNAL error code */
+	UDS_ERROR_CODE_LAST,
+	/* One more than the last error this block will ever use */
+	UDS_ERROR_CODE_BLOCK_END = UDS_ERROR_CODE_BASE + 440,
+};
+
+enum {
+	VDO_MAX_ERROR_NAME_SIZE = 80,
+	VDO_MAX_ERROR_MESSAGE_SIZE = 128,
+};
+
+struct error_info {
+	const char *name;
+	const char *message;
+};
+
+const char * __must_check uds_string_error(int errnum, char *buf, size_t buflen);
+
+const char *uds_string_error_name(int errnum, char *buf, size_t buflen);
+
+int uds_status_to_errno(int error);
+
+int uds_register_error_block(const char *block_name, int first_error,
+			     int last_reserved_error, const struct error_info *infos,
+			     size_t info_size);
+
+#endif /* UDS_ERRORS_H */