Support the copy operation for the stripe target. In stripe_merge, we verify that the underlying device supports copy. If it doesn't, we can fail fast without any bio being contructed.
Signed-off-by: Mikulas Patocka <[email protected]> --- drivers/md/dm-stripe.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) Index: linux-3.16-rc4/drivers/md/dm-stripe.c =================================================================== --- linux-3.16-rc4.orig/drivers/md/dm-stripe.c 2014-07-11 22:20:25.000000000 +0200 +++ linux-3.16-rc4/drivers/md/dm-stripe.c 2014-07-11 22:23:54.000000000 +0200 @@ -165,6 +165,7 @@ static int stripe_ctr(struct dm_target * ti->num_flush_bios = stripes; ti->num_discard_bios = stripes; ti->num_write_same_bios = stripes; + ti->copy_supported = 1; sc->chunk_size = chunk_size; if (chunk_size & (chunk_size - 1)) @@ -416,11 +417,19 @@ static int stripe_merge(struct dm_target struct stripe_c *sc = ti->private; sector_t bvm_sector = bvm->bi_sector; uint32_t stripe; + struct block_device *bdev; struct request_queue *q; stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector); - q = bdev_get_queue(sc->stripe[stripe].dev->bdev); + bdev = sc->stripe[stripe].dev->bdev; + + if (unlikely((bvm->bi_rw & REQ_COPY) != 0)) { + if (!bdev_copy_offload(bdev)) + return 0; + } + + q = bdev_get_queue(bdev); if (!q->merge_bvec_fn) return max_size; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
