Forcing sg also makes qemu skip trying to read from the device to guess the
image format by reading from the device (find_image_format()).
SMC devices do not implement READ6/10/12/16 so it is noit possible to read
from them.
With this patch I can successfully manage a SMC device wiht iscsi in
passthrough mode.
Signed-off-by: Ronnie Sahlberg <ronniesahlb...@gmail.com>
---
block/iscsi.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/block/iscsi.c b/block/iscsi.c
index a015a52..9ce38b5 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1032,6 +1032,15 @@ static int iscsi_open(BlockDriverState *bs, const char
*filename, int flags)
if (iscsi_url != NULL) {
iscsi_destroy_url(iscsi_url);
}
+
+ /* Medium changer. We dont have any emulation for this so this must
+ be sg ioctl compatible. We force it to be sg, otherwise qemu will try
+ to read from the device to guess the image format.
+ */
+ if (iscsilun->type == TYPE_MEDIUM_CHANGER) {
+ bs->sg = 1;
+ }
+
return 0;
failed:
--
1.7.3.1
