Commit 5fc2ffea authored by Mike Snitzer's avatar Mike Snitzer Committed by Alasdair G Kergon
Browse files

dm raid1: support discard 



Enable discard support in the DM mirror target.
Also change an existing use of 'bvec' to 'addr' in the union.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 84c89557

drivers/md/dm-raid1.c

+10 −2
Original line number Diff line number Diff line
@@ -261,7 +261,7 @@ static int mirror_flush(struct dm_target *ti) 
	struct dm_io_request io_req = {

		.bi_rw = WRITE_FLUSH,

		.mem.type = DM_IO_KMEM,

		.mem.ptr.bvec = NULL,

		.mem.ptr.addr = NULL,

		.client = ms->io_client,

	};
@@ -637,6 +637,12 @@ static void do_write(struct mirror_set *ms, struct bio *bio) 
		.client = ms->io_client,

	};



	if (bio->bi_rw & REQ_DISCARD) {

		io_req.bi_rw |= REQ_DISCARD;

		io_req.mem.type = DM_IO_KMEM;

		io_req.mem.ptr.addr = NULL;

	}



	for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++)

		map_region(dest++, m, bio);
@@ -670,7 +676,8 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes) 
	bio_list_init(&requeue);



	while ((bio = bio_list_pop(writes))) {

		if (bio->bi_rw & REQ_FLUSH) {

		if ((bio->bi_rw & REQ_FLUSH) ||

		    (bio->bi_rw & REQ_DISCARD)) {

			bio_list_add(&sync, bio);

			continue;

		}
@@ -1076,6 +1083,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv) 
	ti->private = ms;

	ti->split_io = dm_rh_get_region_size(ms->rh);

	ti->num_flush_requests = 1;

	ti->num_discard_requests = 1;



	ms->kmirrord_wq = create_singlethread_workqueue("kmirrord");

	if (!ms->kmirrord_wq) {