if the target does not support UNMAP or the request
is too big silently ignore the discard request.
Signed-off-by: Peter Lieven <p...@kamp.de>
---
block/iscsi.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index e9ecfce..0567b46 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -694,6 +694,14 @@ iscsi_aio_discard(BlockDriverState *bs,
acb->sector_num = sector_num;
acb->retries = ISCSI_CMD_RETRIES;
+ if (!iscsilun->lbpu ||
+ sector_qemu2lun(nb_sectors, iscsilun) > iscsilun->max_unmap) {
+ /* silently ignore discard request */
+ acb->status = 0;
+ iscsi_schedule_bh(acb);
+ return &acb->common;
+ }
+
if (iscsi_aio_discard_acb(acb) != 0) {
qemu_aio_release(acb);
return NULL;
--
1.7.9.5
