+ if (rw & REQ_DISCARD) {
+ for (i = 0; i < num_stripes; i++) {
+ multi->stripes[i].physical =
+ map->stripes[stripe_index].physical +
+ stripe_offset + stripe_nr * map->stripe_len;
+ multi->stripes[i].dev = map->stripes[stripe_index].dev;
+
+ if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
+ u64 stripes;
+ u32 last_stripe = 0;
+ int j;
+
+ div_u64_rem(stripe_nr_end - 1,
+ map->num_stripes,
+ &last_stripe);
+
+ for (j = 0; j < map->num_stripes; j++) {
+ u32 test;
+
+ div_u64_rem(stripe_nr_end - 1 - j,
+ map->num_stripes, &test);
+ if (test == stripe_index)
+ break;
+ }
+ stripes = stripe_nr_end - 1 - j;
+ do_div(stripes, map->num_stripes);
+ multi->stripes[i].length = map->stripe_len *
+ (stripes - stripe_nr + 1);
+
+ if (i == 0) {
+ multi->stripes[i].length -=
+ stripe_offset;
+ stripe_offset = 0;
+ }
+ if (stripe_index == last_stripe)
+ multi->stripes[i].length -=
+ stripe_end_offset;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ u64 stripes;
+ int j;
+ int factor = map->num_stripes /
+ map->sub_stripes;
+ u32 last_stripe = 0;
+
+ div_u64_rem(stripe_nr_end - 1,
+ factor, &last_stripe);
+ last_stripe *= map->sub_stripes;
+
+ for (j = 0; j < factor; j++) {
+ u32 test;
+
+ div_u64_rem(stripe_nr_end - 1 - j,
+ factor, &test);
+
+ if (test ==
+ stripe_index / map->sub_stripes)
+ break;
+ }
+ stripes = stripe_nr_end - 1 - j;
+ do_div(stripes, factor);
+ multi->stripes[i].length = map->stripe_len *
+ (stripes - stripe_nr + 1);
+
+ if (i < map->sub_stripes) {
+ multi->stripes[i].length -=
+ stripe_offset;
+ if (i == map->sub_stripes - 1)
+ stripe_offset = 0;
+ }
+ if (stripe_index >= last_stripe &&
+ stripe_index <= (last_stripe +
+ map->sub_stripes - 1)) {
+ multi->stripes[i].length -=
+ stripe_end_offset;
+ }
+ } else
+ multi->stripes[i].length = *length;
+
+ stripe_index++;
+ if (stripe_index == map->num_stripes) {
+ /* This could only happen for RAID0/10 */
+ stripe_index = 0;
+ stripe_nr++;
+ }
+ }
+ } else {
+ for (i = 0; i < num_stripes; i++) {
+ multi->stripes[i].physical =
+ map->stripes[stripe_index].physical +
+ stripe_offset +
+ stripe_nr * map->stripe_len;
+ multi->stripes[i].dev =
+ map->stripes[stripe_index].dev;
+ stripe_index++;
+ }