增加文件系统

Lib/dhara/error.h

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+/* Dhara - NAND flash management layer
+ * Copyright (C) 2013 Daniel Beer <dlbeer@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef DHARA_ERROR_H_
+#define DHARA_ERROR_H_
+
+typedef enum {
+	DHARA_E_NONE = 0,
+	DHARA_E_BAD_BLOCK,
+	DHARA_E_ECC,
+	DHARA_E_TOO_BAD,
+	DHARA_E_RECOVER,
+	DHARA_E_JOURNAL_FULL,
+	DHARA_E_NOT_FOUND,
+	DHARA_E_MAP_FULL,
+	DHARA_E_CORRUPT_MAP,
+	DHARA_E_MAX
+} dhara_error_t;
+
+/* Produce a human-readable error message. This function is kept in a
+ * separate compilation unit and can be omitted to reduce binary size.
+ */
+const char *dhara_strerror(dhara_error_t err);
+
+/* Save an error */
+static inline void dhara_set_error(dhara_error_t *err, dhara_error_t v)
+{
+	if (err)
+		*err = v;
+}
+
+#endif