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Revision 622695a4

ID622695a4585a786fdcd53852c7af87ed0af1af80

Added by Ronnie Sahlberg almost 12 years ago

ISCSI: force use of sg for SMC and SSC devices

If the device we open is a SMC or SSC device, then force the use of sg. We
dont have any medium changer or tape emulation so only passthrough via
real sg or scsi-generic via iscsi would work anyway.

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 not possible to
read from them (SSC have different CDBs).

With this patch I can successfully manage a SMC device wiht iscsi in
passthrough mode.

Signed-off-by: Ronnie Sahlberg <>
[Added TYPE_TAPE handling - Paolo]
Signed-off-by: Paolo Bonzini <>

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