Add RAID10 support

diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index f8fbf95e9233e4a4bbaed3f7cacfc01d5b78874c..e6bab83aac5416a9b7abf7c6b48f6561819a1ba7 100644 (file)
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -111,6 +111,7 @@ struct grub_btrfs_chunk_item
 #define GRUB_BTRFS_CHUNK_TYPE_RAID0         0x08
 #define GRUB_BTRFS_CHUNK_TYPE_RAID1         0x10
 #define GRUB_BTRFS_CHUNK_TYPE_DUPLICATED    0x20
+#define GRUB_BTRFS_CHUNK_TYPE_RAID10        0x40
   grub_uint8_t dummy2[0xc];
   grub_uint16_t nstripes;
   grub_uint16_t nsubstripes;
@@ -668,9 +669,26 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
              csize = grub_le_to_cpu64 (chunk->stripe_length) - low;
              break;
            }
+         case GRUB_BTRFS_CHUNK_TYPE_RAID10:
+           /* FIXME: Use redundancy.  */
+           {
+             grub_uint64_t middle, high;
+             grub_uint32_t low;
+             middle = grub_divmod64 (off,
+                                     grub_le_to_cpu64 (chunk->stripe_length),
+                                     &low);
+             
+             high = grub_divmod64 (middle,
+                                   grub_le_to_cpu16 (chunk->nsubstripes),
+                                   &stripen);
+             stripen *= grub_le_to_cpu16 (chunk->nstripes)
+               / grub_le_to_cpu16 (chunk->nsubstripes);
+             stripe_offset = low + grub_le_to_cpu64 (chunk->stripe_length)
+               * high;
+             csize = grub_le_to_cpu64 (chunk->stripe_length) - low;
+             break;
+           }
          default:
-           grub_printf ("unsupported RAID flags %" PRIxGRUB_UINT64_T "\n",
-                        grub_le_to_cpu64 (chunk->type));
            return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
                               "unsupported RAID flags %" PRIxGRUB_UINT64_T,
                               grub_le_to_cpu64 (chunk->type));