[v3,3/4] usb-msd: Propagate removable bit to SCSI device

Submitted by Stefan Hajnoczi on Jan. 21, 2011, 11 a.m.

Details

Message ID 1295607609-21091-4-git-send-email-stefanha@linux.vnet.ibm.com
State New
Headers show

Commit Message

Stefan Hajnoczi Jan. 21, 2011, 11 a.m.
USB Mass Storage Devices sometimes have the RMB (removable) bit set in
the SCSI INQUIRY response.  Thumbdrives tend to have the bit set whereas
hard disks do not.

Operating systems differentiate between removable devices and fixed
devices.  Under Linux, the anaconda installer looks for removable
devices.  Under Windows, only fixed devices may have more than one
partition and AutoRun is also affected by the removable bit.

For these reasons, allow USB Mass Storage Devices to override the
removable bit:

qemu -usb
     -drive if=none,file=test.img,cache=none,id=disk0
     -device usb-storage,drive=disk0,removable=on

The default is off.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 hw/usb-msd.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

Patch hide | download patch | download mbox

diff --git a/hw/usb-msd.c b/hw/usb-msd.c
index ee897b6..f1f150b 100644
--- a/hw/usb-msd.c
+++ b/hw/usb-msd.c
@@ -50,6 +50,7 @@  typedef struct {
     SCSIBus bus;
     BlockConf conf;
     SCSIDevice *scsi_dev;
+    uint32_t removable;
     int result;
     /* For async completion.  */
     USBPacket *packet;
@@ -544,7 +545,7 @@  static int usb_msd_initfn(USBDevice *dev)
 
     s->dev.speed = USB_SPEED_FULL;
     scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, usb_msd_command_complete);
-    s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, false);
+    s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
     if (!s->scsi_dev) {
         return -1;
     }
@@ -634,6 +635,7 @@  static struct USBDeviceInfo msd_info = {
     .usbdevice_init = usb_msd_init,
     .qdev.props     = (Property[]) {
         DEFINE_BLOCK_PROPERTIES(MSDState, conf),
+        DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
         DEFINE_PROP_END_OF_LIST(),
     },
 };