[libvirt] [PATCH] Update domain xml after usb hotplug

[Cole Robinson <crobinso@xxxxxxxxxx>]

The recently added usb hostdev and mass storage device
hotplug code doesn't append the devices to the running
guests xml if the hotplug succeeds. The attached patch
fixes this.

Thanks,
Cole

commit 8df17db8b36a2c1e8efa430a0493f66825b6b80e
Author: Cole (Work Acct) <crobinso@xxxxxxxxxxxxxxxxxxxxx>
Date:   Thu Aug 21 23:08:04 2008 -0400

    Add hotplugged usb devices to running domain xml.

diff --git a/src/domain_conf.c b/src/domain_conf.c
index 3c61039..dc5eb0c 100644
--- a/src/domain_conf.c
+++ b/src/domain_conf.c
@@ -481,8 +481,8 @@ void virDomainRemoveInactive(virDomainObjPtr *doms,
 }
 
 #ifndef PROXY
-static int virDomainDiskCompare(virDomainDiskDefPtr a,
-                                virDomainDiskDefPtr b) {
+int virDomainDiskCompare(virDomainDiskDefPtr a,
+                         virDomainDiskDefPtr b) {
     if (a->bus == b->bus)
         return virDiskNameToIndex(a->dst) - virDiskNameToIndex(b->dst);
     else
diff --git a/src/domain_conf.h b/src/domain_conf.h
index b98f7f3..cfa2a90 100644
--- a/src/domain_conf.h
+++ b/src/domain_conf.h
@@ -526,6 +526,8 @@ char *virDomainCpuSetFormat(virConnectPtr conn,
                             char *cpuset,
                             int maxcpu);
 
+int virDomainDiskCompare(virDomainDiskDefPtr a,
+                         virDomainDiskDefPtr b);
 
 int virDomainSaveConfig(virConnectPtr conn,
                         const char *configDir,
diff --git a/src/qemu_driver.c b/src/qemu_driver.c
index 769f34f..9a26375 100644
--- a/src/qemu_driver.c
+++ b/src/qemu_driver.c
@@ -62,6 +62,7 @@
 #include "capabilities.h"
 #include "memory.h"
 #include "uuid.h"
+#include "domain_conf.h"
 
 /* For storing short-lived temporary files. */
 #define TEMPDIR LOCAL_STATE_DIR "/cache/libvirt"
@@ -3044,6 +3045,7 @@ static int qemudDomainAttachUsbMassstorageDevice(virDomainPtr dom, virDomainDevi
     virDomainObjPtr vm = virDomainFindByUUID(driver->domains, dom->uuid);
     int ret;
     char *cmd, *reply;
+    virDomainDiskDefPtr *dest, *prev, ptr;
 
     if (!vm) {
         qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_DOMAIN,
@@ -3051,6 +3053,28 @@ static int qemudDomainAttachUsbMassstorageDevice(virDomainPtr dom, virDomainDevi
         return -1;
     }
 
+    /* Find spot in domain definition where we will put the disk */
+    ptr = vm->def->disks;
+    prev = &(vm->def->disks);
+    while (ptr) {
+        if (STREQ(dev->data.disk->dst, ptr->dst)) {
+            qemudReportError(dom->conn, dom, NULL, VIR_ERR_INTERNAL_ERROR,
+                             _("duplicate disk target '%s'"),
+                             dev->data.disk->dst);
+            return -1;
+        }
+        if (virDomainDiskCompare(dev->data.disk, ptr) < 0) {
+            dest = &(ptr);
+            break;
+        }
+        prev = &(ptr->next);
+        ptr = ptr->next;
+    }
+
+    if (!ptr) {
+        dest = prev;
+    }
+
     ret = asprintf(&cmd, "usb_add disk:%s", dev->data.disk->src);
     if (ret == -1) {
         qemudReportError(dom->conn, NULL, NULL, VIR_ERR_NO_MEMORY, NULL);
@@ -3059,7 +3083,7 @@ static int qemudDomainAttachUsbMassstorageDevice(virDomainPtr dom, virDomainDevi
 
     if (qemudMonitorCommand(driver, vm, cmd, &reply) < 0) {
         qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
-                         "%s", _("cannot attach usb device"));
+                         "%s", _("cannot attach usb disk"));
         VIR_FREE(cmd);
         return -1;
     }
@@ -3070,11 +3094,16 @@ static int qemudDomainAttachUsbMassstorageDevice(virDomainPtr dom, virDomainDevi
     if (strstr(reply, "Could not add ")) {
         qemudReportError (dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
                           "%s",
-                          _("adding usb device failed"));
+                          _("adding usb disk failed"));
         VIR_FREE(reply);
         VIR_FREE(cmd);
         return -1;
     }
+
+    /* Actually update the xml */
+    dev->data.disk->next = *dest;
+    *prev = dev->data.disk;
+
     VIR_FREE(reply);
     VIR_FREE(cmd);
     return 0;
@@ -3125,6 +3154,11 @@ static int qemudDomainAttachHostDevice(virDomainPtr dom, virDomainDeviceDefPtr d
         VIR_FREE(cmd);
         return -1;
     }
+
+    /* Update xml */
+    dev->data.hostdev->next = vm->def->hostdevs;
+    vm->def->hostdevs = dev->data.hostdev;
+
     VIR_FREE(reply);
     VIR_FREE(cmd);
     return 0;
@@ -3167,7 +3201,7 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
                 ret = qemudDomainAttachHostDevice(dom, dev);
     } else {
         qemudReportError(dom->conn, dom, NULL, VIR_ERR_NO_SUPPORT,
-                         "%s", _("this devicetype cannot be attached"));
+                         "%s", _("this device type cannot be attached"));
         ret = -1;
     }
 

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