[Qemu-devel] [PATCH v4 05/11] qga-win: refactor disk properties (bus)

["Tomáš Golembiovský" <tgolembi@redhat.com>]

Refactor code that queries bus type to be more generic. The function
get_disk_bus_type() has been renamed to build_guest_disk_info().
Following commit(s) will extend this function.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
---
 qga/commands-win32.c | 46 +++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 18 deletions(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 2a7a3af614..d7864fc65a 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -583,25 +583,29 @@ out:
     return pci;
 }
 
-static int get_disk_bus_type(HANDLE vol_h, Error **errp)
+static void get_disk_properties(HANDLE vol_h, GuestDiskAddress *disk,
+    Error **errp)
 {
     STORAGE_PROPERTY_QUERY query;
     STORAGE_DEVICE_DESCRIPTOR *dev_desc, buf;
     DWORD received;
+    ULONG size = sizeof(buf);
 
     dev_desc = &buf;
-    dev_desc->Size = sizeof(buf);
     query.PropertyId = StorageDeviceProperty;
     query.QueryType = PropertyStandardQuery;
 
     if (!DeviceIoControl(vol_h, IOCTL_STORAGE_QUERY_PROPERTY, &query,
                          sizeof(STORAGE_PROPERTY_QUERY), dev_desc,
-                         dev_desc->Size, &received, NULL)) {
+                         size, &received, NULL)) {
         error_setg_win32(errp, GetLastError(), "failed to get bus type");
-        return -1;
+        return;
     }
+    disk->bus_type = find_bus_type(dev_desc->BusType);
+    g_debug("bus type %d", disk->bus_type);
+    g_free(dev_desc);
 
-    return dev_desc->BusType;
+    return;
 }
 
 /* VSS provider works with volumes, thus there is no difference if
@@ -613,8 +617,8 @@ static GuestDiskAddressList *build_guest_disk_info(char *guid, Error **errp)
     GuestDiskAddress *disk;
     SCSI_ADDRESS addr, *scsi_ad;
     DWORD len;
-    int bus;
     HANDLE vol_h;
+    Error *local_err = NULL;
 
     scsi_ad = &addr;
     char *name = g_strndup(guid, strlen(guid)-1);
@@ -624,22 +628,22 @@ static GuestDiskAddressList *build_guest_disk_info(char *guid, Error **errp)
                        0, NULL);
     if (vol_h == INVALID_HANDLE_VALUE) {
         error_setg_win32(errp, GetLastError(), "failed to open volume");
-        goto out_free;
+        goto err;
     }
 
-    g_debug("getting bus type");
-    bus = get_disk_bus_type(vol_h, errp);
-    if (bus < 0) {
-        goto out_close;
+    disk = g_malloc0(sizeof(*disk));
+    get_disk_properties(vol_h, disk, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        goto err_close;
     }
 
-    disk = g_malloc0(sizeof(*disk));
-    disk->bus_type = find_bus_type(bus);
-    g_debug("bus type %d", disk->bus_type);
-    if (bus == BusTypeScsi || bus == BusTypeAta || bus == BusTypeRAID
+    if (disk->bus_type == GUEST_DISK_BUS_TYPE_SCSI
+            || disk->bus_type == GUEST_DISK_BUS_TYPE_IDE
+            || disk->bus_type == GUEST_DISK_BUS_TYPE_RAID
 #if (_WIN32_WINNT >= 0x0600)
             /* This bus type is not supported before Windows Server 2003 SP1 */
-            || bus == BusTypeSas
+            || disk->bus_type == GUEST_DISK_BUS_TYPE_SAS
 #endif
         ) {
         /* We are able to use the same ioctls for different bus types
@@ -679,11 +683,17 @@ static GuestDiskAddressList *build_guest_disk_info(char *guid, Error **errp)
     list = g_malloc0(sizeof(*list));
     list->value = disk;
     list->next = NULL;
-out_close:
     CloseHandle(vol_h);
-out_free:
     g_free(name);
     return list;
+
+err_close:
+    g_free(disk);
+    CloseHandle(vol_h);
+err:
+    g_free(name);
+
+    return NULL;
 }
 
 #else
-- 
2.19.0