1 files changed, 76 insertions, 0 deletions
diff --git a/grub-core/disk/raid5_recover.c b/grub-core/disk/raid5_recover.c
new file mode 100644
index 0000000..4ace917
--- /dev/null
+++ b/grub-core/disk/raid5_recover.c
@@ -0,0 +1,76 @@
+/* raid5_recover.c - module to recover from faulty RAID4/5 arrays.  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
+ *
+ *  GRUB 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.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/disk.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/diskfilter.h>
+#include <grub/crypto.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_err_t
+grub_raid5_recover (struct grub_diskfilter_segment *array, int disknr,
+                    char *buf, grub_disk_addr_t sector, grub_size_t size)
+{
+  char *buf2;
+  int i;
+
+  size <<= GRUB_DISK_SECTOR_BITS;
+  buf2 = grub_malloc (size);
+  if (!buf2)
+    return grub_errno;
+
+  grub_memset (buf, 0, size);
+
+  for (i = 0; i < (int) array->node_count; i++)
+    {
+      grub_err_t err;
+
+      if (i == disknr)
+        continue;
+
+      err = grub_diskfilter_read_node (&array->nodes[i], sector,
+				       size >> GRUB_DISK_SECTOR_BITS, buf2);
+
+      if (err)
+        {
+          grub_free (buf2);
+          return err;
+        }
+
+      grub_crypto_xor (buf, buf, buf2, size);
+    }
+
+  grub_free (buf2);
+
+  return GRUB_ERR_NONE;
+}
+
+GRUB_MOD_INIT(raid5rec)
+{
+  grub_raid5_recover_func = grub_raid5_recover;
+}
+
+GRUB_MOD_FINI(raid5rec)
+{
+  grub_raid5_recover_func = 0;
+}