From 5fc2ffeabb9ee0fc0e71ff16b49f34f0ed3d05b4 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 13 Jan 2011 19:59:48 +0000
Subject: [PATCH] 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: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---
drivers/md/dm-raid1.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 19a59b041c277a..c87756eb7a2149 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -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) {
--
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