Add the fix command

Split in various files
Add --force switch
Add --start switch

parity.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2011 Andrea Mazzoleni
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PARITY_H
+#define __PARITY_H
+
+/****************************************************************************/
+/* parity */
+
+/**
+ * Computes the size of the parity data in number of blocks.
+ */
+pos_t parity_resize(struct snapraid_state* state);
+
+int parity_create(const char* path, off_t size);
+
+int parity_open(int ret_on_error, const char* path);
+
+void parity_close(const char* path, int f);
+
+void parity_write(const char* parity_path, int parity_f, pos_t pos, unsigned char* block_buffer, unsigned block_size);
+
+int parity_read(int ret_on_error, const char* parity_path, int parity_f, pos_t pos, unsigned char* block_buffer, unsigned block_size);
+
+#endif
+