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, 7 insertions, 9 deletions

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index d76e640..e900eff 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1043,26 +1043,24 @@ static void scsi_destroy(SCSIDevice *dev)
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 
     scsi_disk_purge_requests(s);
-    blockdev_mark_auto_del(s->qdev.conf.dinfo->bdrv);
+    blockdev_mark_auto_del(s->qdev.conf.bs);
 }
 
 static int scsi_disk_initfn(SCSIDevice *dev)
 {
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
+    DriveInfo *dinfo;
 
-    if (!s->qdev.conf.dinfo || !s->qdev.conf.dinfo->bdrv) {
+    if (!s->qdev.conf.bs) {
         error_report("scsi-disk: drive property not set");
         return -1;
     }
-    s->bs = s->qdev.conf.dinfo->bdrv;
+    s->bs = s->qdev.conf.bs;
 
     if (!s->serial) {
-        if (*dev->conf.dinfo->serial) {
-            /* try to fall back to value set with legacy -drive serial=... */
-            s->serial = qemu_strdup(dev->conf.dinfo->serial);
-        } else {
-            s->serial = qemu_strdup("0");
-        }
+        /* try to fall back to value set with legacy -drive serial=... */
+        dinfo = drive_get_by_blockdev(s->bs);
+        s->serial = qemu_strdup(*dinfo->serial ? dinfo->serial : "0");
     }
 
     if (!s->version) {