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-rw-r--r--include/linux/raid/raid10.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/raid/raid10.h b/include/linux/raid/raid10.h
index b1103298a8c..c41e56a7c09 100644
--- a/include/linux/raid/raid10.h
+++ b/include/linux/raid/raid10.h
@@ -24,11 +24,16 @@ struct r10_private_data_s {
int far_copies; /* number of copies layed out
* at large strides across drives
*/
+ int far_offset; /* far_copies are offset by 1 stripe
+ * instead of many
+ */
int copies; /* near_copies * far_copies.
* must be <= raid_disks
*/
sector_t stride; /* distance between far copies.
- * This is size / far_copies
+ * This is size / far_copies unless
+ * far_offset, in which case it is
+ * 1 stripe.
*/
int chunk_shift; /* shift from chunks to sectors */