[PATCH 2/5] block/prl-xml: add bdrv_co_readv/writev and flush

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

From: Klim Kireev <klim.kireev@virtuozzo.com>

This commit adds bdrv_co_readv, bdrv_co_writev, and bdrv_co_flush_to_os
implementation. It merely passes these functions down
to top BlockDriverState in the snapshot chain.

Signed-off-by: Klim Kireev <klim.kireev@virtuozzo.com>
Signed-off-by: Edgar Kaziakhmedov <edgar.kaziakhmedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com>
---
 block/prl-xml.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/block/prl-xml.c b/block/prl-xml.c
index fa9c4fd5fa..5ab32bb6ab 100644
--- a/block/prl-xml.c
+++ b/block/prl-xml.c
@@ -467,6 +467,22 @@ fail:
     return ret;
 }
 
+static coroutine_fn int
+prl_co_readv(BlockDriverState *bs, int64_t sector_num,
+             int nb_sectors, QEMUIOVector *qiov)
+{
+    BDRVPrlXmlState *s = bs->opaque;
+    return bdrv_co_readv(s->image, sector_num, nb_sectors, qiov);
+}
+
+static coroutine_fn int
+prl_co_writev(BlockDriverState *bs, int64_t sector_num,
+              int nb_sectors, QEMUIOVector *qiov)
+{
+    BDRVPrlXmlState *s = bs->opaque;
+    return bdrv_co_writev(s->image, sector_num, nb_sectors, qiov);
+}
+
 static void prl_close_xml(BlockDriverState *bs)
 {
     BDRVPrlXmlState *s = bs->opaque;
@@ -474,11 +490,20 @@ static void prl_close_xml(BlockDriverState *bs)
     xmlFreeDoc(s->xml);
 }
 
+static coroutine_fn int prl_co_flush_to_os(BlockDriverState *bs)
+{
+    BDRVPrlXmlState *s = bs->opaque;
+    return bdrv_co_flush(s->image->bs);
+}
+
 static BlockDriver bdrv_prl_xml = {
     .format_name                = "prl-xml",
     .instance_size              = sizeof(BDRVPrlXmlState),
     .bdrv_open                  = prl_open_xml,
+    .bdrv_co_readv              = prl_co_readv,
+    .bdrv_co_writev             = prl_co_writev,
     .bdrv_close                 = prl_close_xml,
+    .bdrv_co_flush_to_os        = prl_co_flush_to_os,
     .create_opts                = &prl_xml_create_opts,
     .bdrv_child_perm            = bdrv_filter_default_perms,
     .is_filter                  = true
-- 
2.21.3