qdev: Decouple qdev_prop_drive from DriveInfo

Make the property point to BlockDriverState, cutting out the DriveInfo
middleman.  This prepares the ground for block devices that don't have
a DriveInfo.

Currently all user-defined ones have a DriveInfo, because the only way
to define one is -drive & friends (they go through drive_init()).
DriveInfo is closely tied to -drive, and like -drive, it mixes
information about host and guest part of the block device.  I'm
working towards a new way to define block devices, with clean
host/guest separation, and I need to get DriveInfo out of the way for
that.

Fortunately, the device models are perfectly happy with
BlockDriverState, except for two places: ide_drive_initfn() and
scsi_disk_initfn() need to check the DriveInfo for a serial number set
with legacy -drive serial=...  Use drive_get_by_blockdev() there.

Device model code should now use DriveInfo only when explicitly
dealing with drives defined the old way, i.e. without -device.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 127478ba65..a5fdab04ba 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -39,7 +39,7 @@ static int ide_qdev_init(DeviceState *qdev, DeviceInfo *base)
     IDEDeviceInfo *info = DO_UPCAST(IDEDeviceInfo, qdev, base);
     IDEBus *bus = DO_UPCAST(IDEBus, qbus, qdev->parent_bus);
 
-    if (!dev->conf.dinfo) {
+    if (!dev->conf.bs) {
         fprintf(stderr, "%s: no drive specified\n", qdev->info->name);
         goto err;
     }
@@ -83,7 +83,7 @@ IDEDevice *ide_create_drive(IDEBus *bus, int unit, DriveInfo *drive)
 
     dev = qdev_create(&bus->qbus, "ide-drive");
     qdev_prop_set_uint32(dev, "unit", unit);
-    qdev_prop_set_drive(dev, "drive", drive);
+    qdev_prop_set_drive(dev, "drive", drive->bdrv);
     qdev_init_nofail(dev);
     return DO_UPCAST(IDEDevice, qdev, dev);
 }
@@ -99,14 +99,18 @@ static int ide_drive_initfn(IDEDevice *dev)
     IDEBus *bus = DO_UPCAST(IDEBus, qbus, dev->qdev.parent_bus);
     IDEState *s = bus->ifs + dev->unit;
     const char *serial;
+    DriveInfo *dinfo;
 
     serial = dev->serial;
     if (!serial) {
         /* try to fall back to value set with legacy -drive serial=... */
-        serial = dev->conf.dinfo->serial;
+        dinfo = drive_get_by_blockdev(dev->conf.bs);
+        if (*dinfo->serial) {
+            serial = dinfo->serial;
+        }
     }
 
-    ide_init_drive(s, dev->conf.dinfo, dev->version, serial);
+    ide_init_drive(s, dev->conf.bs, dev->version, serial);
 
     if (!dev->version) {
         dev->version = qemu_strdup(s->version);