Il 26/05/2012 06:56, Ronnie Sahlberg ha scritto:
> 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:
Modified to also do the same for tapes, applied to scsi-next branch for 1.2.
Paolo
