raid5: Initialize bi_vcnt

The patch that converted raid5 to use bio_reset() forgot to initialize
bi_vcnt.

Signed-off-by: Kent Overstreet <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: [email protected]
Tested-by: Ilia Mirkin <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: Kent Overstreet

drivers/md/raid5.c

@@ -664,6 +664,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
 				bi->bi_rw |= REQ_FLUSH;
 
+			bi->bi_vcnt = 1;
 			bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
 			bi->bi_io_vec[0].bv_offset = 0;
 			bi->bi_size = STRIPE_SIZE;
@@ -701,6 +702,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			else
 				rbi->bi_sector = (sh->sector
 						  + rrdev->data_offset);
+			rbi->bi_vcnt = 1;
 			rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
 			rbi->bi_io_vec[0].bv_offset = 0;
 			rbi->bi_size = STRIPE_SIZE;