[Qemu-devel] [PATCH 0/4] ISCSI: Passthough updates

[Ronnie Sahlberg]

Paolo, list

Please find a set of patches for iscsi.

1, The recent change to the eventsystem in iscsi is racy. If the async connect 
of the socket takes longer than almost instant, the shortcircuit trying to 
write directly to the socket may try to do so before the socket is established.
So we hcange the logic here and ONLY try the shortcircuit avoiding setting up 
POLLOUT if we have been fully logged in.

This avoids the race where we might crash if the socket is not yet connected.

2, Swithc to using READCAPACITY10  for MMC devices. Only SBC devices support 
READCAPACITY16 so far.

3, Switch to use READ10 for MMC devices instead of READ16. With this patch 
ISCSI and MMC devices now work correctly.

4, If the device is a SMC device, then force the device to be sg.
We dont support emulation as far as i know for SMV devices, so these device 
types would only work for sg or iscsi passthrough anyway.
The reason we need to forcer sg is that since we can not READ from a SMC 
device, we need to shortcircuit  find_image_format()  before it tries to do the 
bdrv_pread() trying to guess what format the image is.

With this patch I have verified I can access and manage a media changer via 
iscsi-passthrough.


regards
ronnie sahblerg