[Xen-devel] [PATCH 2/3]: Blktap kernel compat layer

[Chris Lalancette <clalance@xxxxxxxxxx>]

The kernel side of the blktap extended vbd compatibility layer.

Signed-off-by: Chris Lalancette <clalance@xxxxxxxxxx>

diff -r db4f08203b8a drivers/xen/blktap/blktap.c
--- a/drivers/xen/blktap/blktap.c       Tue Jul 08 09:31:24 2008 +0100
+++ b/drivers/xen/blktap/blktap.c       Wed Jul 09 02:13:03 2008 +0200
@@ -89,8 +89,13 @@
 /*Data struct handed back to userspace for tapdisk device to VBD mapping*/
 typedef struct domid_translate {
        unsigned short domid;
+       unsigned short busid;
+} domid_translate_t ;
+
+typedef struct domid_translate_ext {
+       unsigned short domid;
        u32 busid;
-} domid_translate_t ;
+} domid_translate_ext_t ;
 
 /*Data struct associated with each of the tapdisk devices*/
 typedef struct tap_blkif {
@@ -110,7 +115,7 @@
        unsigned long *idx_map;       /*Record the user ring id to kern 
                                        [req id, idx] tuple                  */
        blkif_t *blkif;               /*Associate blkif with tapdev          */
-       struct domid_translate trans; /*Translation from domid to bus.       */
+       struct domid_translate_ext trans; /*Translation from domid to bus.   */
 } tap_blkif_t;
 
 static struct tap_blkif *tapfds[MAX_TAP_DEV];
@@ -213,6 +218,7 @@
 #define BLKTAP_IOCTL_MAJOR          7
 #define BLKTAP_QUERY_ALLOC_REQS      8
 #define BLKTAP_IOCTL_FREEINTF        9
+#define BLKTAP_IOCTL_NEWINTF_EXT     50
 #define BLKTAP_IOCTL_PRINT_IDXS      100  
 
 /* blktap switching modes: (Set with BLKTAP_IOCTL_SETMODE)             */
@@ -782,6 +788,26 @@
                }
                info->trans.domid = tr->domid;
                info->trans.busid = tr->busid;
+               return info->minor;
+       }
+       case BLKTAP_IOCTL_NEWINTF_EXT:
+       {
+               void __user *udata = (void __user *) arg;
+               domid_translate_ext_t tr;
+
+               if (copy_from_user(&tr, udata, sizeof(domid_translate_ext_t)))
+                       return -EFAULT;
+
+               DPRINTK("NEWINTF_EXT Req for domid %d and bus id %d\n", 
+                      tr.domid, tr.busid);
+               info = get_next_free_dev();
+               if (!info) {
+                       WPRINTK("Error initialising /dev/xen/blktap - "
+                               "No more devices\n");
+                       return -1;
+               }
+               info->trans.domid = tr.domid;
+               info->trans.busid = tr.busid;
                return info->minor;
        }
        case BLKTAP_IOCTL_FREEINTF:

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