ISCSI: get device type at connection time

This is needed to avoid READ CAPACITY(16) for MMC devices.
Signed-off-by: NRonnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

block/iscsi.c

@@ -29,6 +29,7 @@
 #include "qemu-error.h"
 #include "block_int.h"
 #include "trace.h"
+#include "hw/scsi-defs.h"
 
 #include <iscsi/iscsi.h>
 #include <iscsi/scsi-lowlevel.h>
@@ -37,6 +38,7 @@
 typedef struct IscsiLun {
     struct iscsi_context *iscsi;
     int lun;
+    enum scsi_inquiry_peripheral_device_type type;
     int block_size;
     uint64_t num_blocks;
     int events;
@@ -508,18 +510,33 @@ iscsi_readcapacity16_cb(struct iscsi_context *iscsi, int status,
 }
 
 static void
-iscsi_connect_cb(struct iscsi_context *iscsi, int status, void *command_data,
+iscsi_inquiry_cb(struct iscsi_context *iscsi, int status, void *command_data,
                  void *opaque)
 {
     struct IscsiTask *itask = opaque;
-    struct scsi_task *task;
+    struct scsi_task *task = command_data;
+    struct scsi_inquiry_standard *inq;
 
     if (status != 0) {
         itask->status   = 1;
         itask->complete = 1;
+        scsi_free_scsi_task(task);
         return;
     }
 
+    inq = scsi_datain_unmarshall(task);
+    if (inq == NULL) {
+        error_report("iSCSI: Failed to unmarshall inquiry data.");
+        itask->status   = 1;
+        itask->complete = 1;
+        scsi_free_scsi_task(task);
+        return;
+    }
+
+    itask->iscsilun->type = inq->periperal_device_type;
+
+    scsi_free_scsi_task(task);
+
     task = iscsi_readcapacity16_task(iscsi, itask->iscsilun->lun,
                                    iscsi_readcapacity16_cb, opaque);
     if (task == NULL) {
@@ -530,6 +547,30 @@ iscsi_connect_cb(struct iscsi_context *iscsi, int status, void *command_data,
     }
 }
 
+static void
+iscsi_connect_cb(struct iscsi_context *iscsi, int status, void *command_data,
+                 void *opaque)
+{
+    struct IscsiTask *itask = opaque;
+    struct scsi_task *task;
+
+    if (status != 0) {
+        itask->status   = 1;
+        itask->complete = 1;
+        return;
+    }
+
+    task = iscsi_inquiry_task(iscsi, itask->iscsilun->lun,
+                              0, 0, 36,
+                              iscsi_inquiry_cb, opaque);
+    if (task == NULL) {
+        error_report("iSCSI: failed to send inquiry command.");
+        itask->status   = 1;
+        itask->complete = 1;
+        return;
+    }
+}
+
 static int parse_chap(struct iscsi_context *iscsi, const char *target)
 {
     QemuOptsList *list;