[PATCH] md: support write-mostly device in raid1

[linux-2.6] / drivers / md / raid5.c

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 43f231a467d5cb0137f15bd5568de80993a0bb08..ed859e08d600fbbc31ba8877fe440fd6167201cd 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1411,6 +1411,11 @@ static int make_request (request_queue_t *q, struct bio * bi)
        sector_t logical_sector, last_sector;
        struct stripe_head *sh;
 
+       if (unlikely(bio_barrier(bi))) {
+               bio_endio(bi, bi->bi_size, -EOPNOTSUPP);
+               return 0;
+       }
+
        md_write_start(mddev, bi);
 
        if (bio_data_dir(bi)==WRITE) {