1 files changed, 28 insertions, 2 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 70b58b4bcf89..61ed150bd0cf 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -550,6 +550,13 @@ static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio)
         sector_t stripe;
         int dev;
         int slot = 0;
+        int last_far_set_start, last_far_set_size;
+
+        last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1;
+        last_far_set_start *= geo->far_set_size;
+
+        last_far_set_size = geo->far_set_size;
+        last_far_set_size += (geo->raid_disks % geo->far_set_size);
 
         /* now calculate first sector/dev */
         chunk = r10bio->sector >> geo->chunk_shift;
@@ -575,9 +582,16 @@ static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio)
                 for (f = 1; f < geo->far_copies; f++) {
                         set = d / geo->far_set_size;
                         d += geo->near_copies;
-                        d %= geo->far_set_size;
-                        d += geo->far_set_size * set;
 
+                        if ((geo->raid_disks % geo->far_set_size) &&
+                            (d > last_far_set_start)) {
+                                d -= last_far_set_start;
+                                d %= last_far_set_size;
+                                d += last_far_set_start;
+                        } else {
+                                d %= geo->far_set_size;
+                                d += geo->far_set_size * set;
+                        }
                         s += geo->stride;
                         r10bio->devs[slot].devnum = d;
                         r10bio->devs[slot].addr = s;
@@ -615,6 +629,18 @@ static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev)
         struct geom *geo = &conf->geo;
         int far_set_start = (dev / geo->far_set_size) * geo->far_set_size;
         int far_set_size = geo->far_set_size;
+        int last_far_set_start;
+
+        if (geo->raid_disks % geo->far_set_size) {
+                last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1;
+                last_far_set_start *= geo->far_set_size;
+
+                if (dev >= last_far_set_start) {
+                        far_set_size = geo->far_set_size;
+                        far_set_size += (geo->raid_disks % geo->far_set_size);
+                        far_set_start = last_far_set_start;
+                }
+        }
 
         offset = sector & geo->chunk_mask;
         if (geo->far_offset) {