Signed-off-by: Peter Lieven <p...@kamp.de>
---
block/iscsi.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index 60f2fd0..64554bc 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -906,6 +906,21 @@ retry:
return 0;
}
+static int
+coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
+ int nb_sectors)
+{
+ IscsiLun *iscsilun = bs->opaque;
+
+ if (!iscsilun->lbprz || !iscsilun->lbpu ||
+ !(bs->open_flags & BDRV_O_UNMAP)) {
+ /* fall back to writev */
+ return -ENOTSUP;
+ }
+
+ return iscsi_co_discard(bs, sector_num, nb_sectors);
+}
+
static int parse_chap(struct iscsi_context *iscsi, const char *target)
{
QemuOptsList *list;
@@ -1452,6 +1467,7 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_is_allocated = iscsi_co_is_allocated,
.bdrv_co_discard = iscsi_co_discard,
+ .bdrv_co_write_zeroes = iscsi_co_write_zeroes,
.bdrv_aio_readv = iscsi_aio_readv,
.bdrv_aio_writev = iscsi_aio_writev,
--
1.7.9.5
