diff --git a/block.c b/block.c
index e71a771..dd6dd76 100644
--- a/block.c
+++ b/block.c
@@ -63,6 +63,9 @@
 static QLIST_HEAD(, BlockDriver) bdrv_drivers =
     QLIST_HEAD_INITIALIZER(bdrv_drivers);
 
+/* The device to use for VM snapshots */
+static BlockDriverState *bs_snapshots;
+
 /* If non-zero, use only whitelisted block drivers */
 static int use_bdrv_whitelist;
 
@@ -288,24 +291,31 @@
     char protocol[128];
     int len;
     const char *p;
-    int is_drive;
 
     /* TODO Drivers without bdrv_file_open must be specified explicitly */
 
-#ifdef _WIN32
-    is_drive = is_windows_drive(filename) ||
-        is_windows_drive_prefix(filename);
-#else
-    is_drive = 0;
-#endif
-    p = strchr(filename, ':');
-    if (!p || is_drive) {
-        drv1 = find_hdev_driver(filename);
-        if (!drv1) {
-            drv1 = bdrv_find_format("file");
-        }
+    /*
+     * XXX(hch): we really should not let host device detection
+     * override an explicit protocol specification, but moving this
+     * later breaks access to device names with colons in them.
+     * Thanks to the brain-dead persistent naming schemes on udev-
+     * based Linux systems those actually are quite common.
+     */
+    drv1 = find_hdev_driver(filename);
+    if (drv1) {
         return drv1;
     }
+
+#ifdef _WIN32
+     if (is_windows_drive(filename) ||
+         is_windows_drive_prefix(filename))
+         return bdrv_find_format("file");
+#endif
+
+    p = strchr(filename, ':');
+    if (!p) {
+        return bdrv_find_format("file");
+    }
     len = p - filename;
     if (len > sizeof(protocol) - 1)
         len = sizeof(protocol) - 1;
@@ -393,7 +403,6 @@
 
     bs->file = NULL;
     bs->total_sectors = 0;
-    bs->is_temporary = 0;
     bs->encrypted = 0;
     bs->valid_key = 0;
     bs->open_flags = flags;
@@ -623,6 +632,9 @@
 void bdrv_close(BlockDriverState *bs)
 {
     if (bs->drv) {
+        if (bs == bs_snapshots) {
+            bs_snapshots = NULL;
+        }
         if (bs->backing_hd) {
             bdrv_delete(bs->backing_hd);
             bs->backing_hd = NULL;
@@ -659,6 +671,8 @@
 
 void bdrv_delete(BlockDriverState *bs)
 {
+    assert(!bs->peer);
+
     /* remove from list, if necessary */
     if (bs->device_name[0] != '\0') {
         QTAILQ_REMOVE(&bdrv_states, bs, list);
@@ -669,9 +683,30 @@
         bdrv_delete(bs->file);
     }
 
+    assert(bs != bs_snapshots);
     qemu_free(bs);
 }
 
+int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
+{
+    if (bs->peer) {
+        return -EBUSY;
+    }
+    bs->peer = qdev;
+    return 0;
+}
+
+void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
+{
+    assert(bs->peer == qdev);
+    bs->peer = NULL;
+}
+
+DeviceState *bdrv_get_attached(BlockDriverState *bs)
+{
+    return bs->peer;
+}
+
 /*
  * Run consistency checks on an image
  *
@@ -1264,6 +1299,14 @@
     return is_read ? bs->on_read_error : bs->on_write_error;
 }
 
+void bdrv_set_removable(BlockDriverState *bs, int removable)
+{
+    bs->removable = removable;
+    if (removable && bs == bs_snapshots) {
+        bs_snapshots = NULL;
+    }
+}
+
 int bdrv_is_removable(BlockDriverState *bs)
 {
     return bs->removable;
@@ -1750,6 +1793,24 @@
     return 1;
 }
 
+BlockDriverState *bdrv_snapshots(void)
+{
+    BlockDriverState *bs;
+
+    if (bs_snapshots) {
+        return bs_snapshots;
+    }
+
+    bs = NULL;
+    while ((bs = bdrv_next(bs))) {
+        if (bdrv_can_snapshot(bs)) {
+            bs_snapshots = bs;
+            return bs;
+        }
+    }
+    return NULL;
+}
+
 int bdrv_snapshot_create(BlockDriverState *bs,
                          QEMUSnapshotInfo *sn_info)
 {
@@ -1981,14 +2042,11 @@
 
     if (ret < 0 && !mcb->error) {
         mcb->error = ret;
-        multiwrite_user_cb(mcb);
     }
 
     mcb->num_requests--;
     if (mcb->num_requests == 0) {
-        if (mcb->error == 0) {
-            multiwrite_user_cb(mcb);
-        }
+        multiwrite_user_cb(mcb);
         qemu_free(mcb);
     }
 }
@@ -2122,8 +2180,29 @@
     // Check for mergable requests
     num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
 
-    // Run the aio requests
+    /*
+     * Run the aio requests. As soon as one request can't be submitted
+     * successfully, fail all requests that are not yet submitted (we must
+     * return failure for all requests anyway)
+     *
+     * num_requests cannot be set to the right value immediately: If
+     * bdrv_aio_writev fails for some request, num_requests would be too high
+     * and therefore multiwrite_cb() would never recognize the multiwrite
+     * request as completed. We also cannot use the loop variable i to set it
+     * when the first request fails because the callback may already have been
+     * called for previously submitted requests. Thus, num_requests must be
+     * incremented for each request that is submitted.
+     *
+     * The problem that callbacks may be called early also means that we need
+     * to take care that num_requests doesn't become 0 before all requests are
+     * submitted - multiwrite_cb() would consider the multiwrite request
+     * completed. A dummy request that is "completed" by a manual call to
+     * multiwrite_cb() takes care of this.
+     */
+    mcb->num_requests = 1;
+
     for (i = 0; i < num_reqs; i++) {
+        mcb->num_requests++;
         acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
             reqs[i].nb_sectors, multiwrite_cb, mcb);
 
@@ -2131,22 +2210,24 @@
             // We can only fail the whole thing if no request has been
             // submitted yet. Otherwise we'll wait for the submitted AIOs to
             // complete and report the error in the callback.
-            if (mcb->num_requests == 0) {
-                reqs[i].error = -EIO;
+            if (i == 0) {
                 goto fail;
             } else {
-                mcb->num_requests++;
                 multiwrite_cb(mcb, -EIO);
                 break;
             }
-        } else {
-            mcb->num_requests++;
         }
     }
 
+    /* Complete the dummy request */
+    multiwrite_cb(mcb, 0);
+
     return 0;
 
 fail:
+    for (i = 0; i < mcb->num_callbacks; i++) {
+        reqs[i].error = -EIO;
+    }
     qemu_free(mcb);
     return -1;
 }
diff --git a/block.h b/block.h
index 6a157f4..3d03b3e 100644
--- a/block.h
+++ b/block.h
@@ -71,6 +71,9 @@
 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
               BlockDriver *drv);
 void bdrv_close(BlockDriverState *bs);
+int bdrv_attach(BlockDriverState *bs, DeviceState *qdev);
+void bdrv_detach(BlockDriverState *bs, DeviceState *qdev);
+DeviceState *bdrv_get_attached(BlockDriverState *bs);
 int bdrv_check(BlockDriverState *bs);
 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
               uint8_t *buf, int nb_sectors);
@@ -159,6 +162,7 @@
 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                        BlockErrorAction on_write_error);
 BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
+void bdrv_set_removable(BlockDriverState *bs, int removable);
 int bdrv_is_removable(BlockDriverState *bs);
 int bdrv_is_read_only(BlockDriverState *bs);
 int bdrv_is_sg(BlockDriverState *bs);
@@ -190,6 +194,7 @@
 void bdrv_get_backing_filename(BlockDriverState *bs,
                                char *filename, int filename_size);
 int bdrv_can_snapshot(BlockDriverState *bs);
+BlockDriverState *bdrv_snapshots(void);
 int bdrv_snapshot_create(BlockDriverState *bs,
                          QEMUSnapshotInfo *sn_info);
 int bdrv_snapshot_goto(BlockDriverState *bs,
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 98fed94..2a63df9 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -111,7 +111,7 @@
 
 static QemuOptsList set_state_opts = {
     .name = "set-state",
-    .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
+    .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
     .desc = {
         {
             .name = "event",
@@ -267,6 +267,8 @@
 
     ret = 0;
 fail:
+    qemu_opts_reset(&inject_error_opts);
+    qemu_opts_reset(&set_state_opts);
     fclose(f);
     return ret;
 }
@@ -299,6 +301,9 @@
     }
     filename = c + 1;
 
+    /* Set initial state */
+    s->vars.state = 1;
+
     /* Open the backing file */
     ret = bdrv_file_open(&bs->file, filename, flags);
     if (ret < 0) {
diff --git a/block/qcow2.c b/block/qcow2.c
index d29e6b6..9ee34b6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -805,14 +805,14 @@
     while (nb_sectors) {
         num = MIN(nb_sectors, INT_MAX >> 9);
         ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta);
-
         if (ret < 0) {
-            return -1;
+            return ret;
         }
 
-        if (qcow2_alloc_cluster_link_l2(bs, &meta) < 0) {
+        ret = qcow2_alloc_cluster_link_l2(bs, &meta);
+        if (ret < 0) {
             qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters);
-            return -1;
+            return ret;
         }
 
         /* There are no dependent requests, but we need to remove our request
@@ -833,7 +833,10 @@
     if (meta.cluster_offset != 0) {
         uint8_t buf[512];
         memset(buf, 0, 512);
-        bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1);
+        ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1);
+        if (ret < 0) {
+            return ret;
+        }
     }
 
     return 0;
@@ -1030,7 +1033,7 @@
         BlockDriver *drv = bdrv_find_format("qcow2");
         bs = bdrv_new("");
         bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR, drv);
-        preallocate(bs);
+        ret = preallocate(bs);
         bdrv_close(bs);
     }
 
diff --git a/block_int.h b/block_int.h
index b64a009..a94b801 100644
--- a/block_int.h
+++ b/block_int.h
@@ -148,6 +148,8 @@
     BlockDriver *drv; /* NULL means no media */
     void *opaque;
 
+    DeviceState *peer;
+
     char filename[1024];
     char backing_file[1024]; /* if non zero, the image is a diff of
                                 this file image */
@@ -210,10 +212,8 @@
 int is_windows_drive(const char *filename);
 #endif
 
-struct DriveInfo;
-
 typedef struct BlockConf {
-    struct DriveInfo *dinfo;
+    BlockDriverState *bs;
     uint16_t physical_block_size;
     uint16_t logical_block_size;
     uint16_t min_io_size;
@@ -234,7 +234,7 @@
 }
 
 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
-    DEFINE_PROP_DRIVE("drive", _state, _conf.dinfo),                    \
+    DEFINE_PROP_DRIVE("drive", _state, _conf.bs),                       \
     DEFINE_PROP_UINT16("logical_block_size", _state,                    \
                        _conf.logical_block_size, 512),                  \
     DEFINE_PROP_UINT16("physical_block_size", _state,                   \
diff --git a/blockdev.c b/blockdev.c
index 4dcfad8..be88098 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -17,6 +17,29 @@
 
 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
 
+/*
+ * We automatically delete the drive when a device using it gets
+ * unplugged.  Questionable feature, but we can't just drop it.
+ * Device models call blockdev_mark_auto_del() to schedule the
+ * automatic deletion, and generic qdev code calls blockdev_auto_del()
+ * when deletion is actually safe.
+ */
+void blockdev_mark_auto_del(BlockDriverState *bs)
+{
+    DriveInfo *dinfo = drive_get_by_blockdev(bs);
+
+    dinfo->auto_del = 1;
+}
+
+void blockdev_auto_del(BlockDriverState *bs)
+{
+    DriveInfo *dinfo = drive_get_by_blockdev(bs);
+
+    if (dinfo->auto_del) {
+        drive_uninit(dinfo);
+    }
+}
+
 QemuOpts *drive_add(const char *file, const char *fmt, ...)
 {
     va_list ap;
@@ -52,18 +75,6 @@
     return NULL;
 }
 
-DriveInfo *drive_get_by_id(const char *id)
-{
-    DriveInfo *dinfo;
-
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        if (strcmp(id, dinfo->id))
-            continue;
-        return dinfo;
-    }
-    return NULL;
-}
-
 int drive_get_max_bus(BlockInterfaceType type)
 {
     int max_bus;
@@ -78,16 +89,16 @@
     return max_bus;
 }
 
-const char *drive_get_serial(BlockDriverState *bdrv)
+DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 {
     DriveInfo *dinfo;
 
     QTAILQ_FOREACH(dinfo, &drives, next) {
-        if (dinfo->bdrv == bdrv)
-            return dinfo->serial;
+        if (dinfo->bdrv == bs) {
+            return dinfo;
+        }
     }
-
-    return "\0";
+    return NULL;
 }
 
 static void bdrv_format_print(void *opaque, const char *name)
diff --git a/blockdev.h b/blockdev.h
index 23ea576..37f3a01 100644
--- a/blockdev.h
+++ b/blockdev.h
@@ -13,6 +13,9 @@
 #include "block.h"
 #include "qemu-queue.h"
 
+void blockdev_mark_auto_del(BlockDriverState *bs);
+void blockdev_auto_del(BlockDriverState *bs);
+
 typedef enum {
     IF_NONE,
     IF_IDE, IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
@@ -28,6 +31,7 @@
     BlockInterfaceType type;
     int bus;
     int unit;
+    int auto_del;               /* see blockdev_mark_auto_del() */
     QemuOpts *opts;
     char serial[BLOCK_SERIAL_STRLEN + 1];
     QTAILQ_ENTRY(DriveInfo) next;
@@ -37,10 +41,9 @@
 #define MAX_SCSI_DEVS	7
 
 extern DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
-extern DriveInfo *drive_get_by_id(const char *id);
 extern int drive_get_max_bus(BlockInterfaceType type);
 extern void drive_uninit(DriveInfo *dinfo);
-extern const char *drive_get_serial(BlockDriverState *bdrv);
+extern DriveInfo *drive_get_by_blockdev(BlockDriverState *bs);
 
 extern QemuOpts *drive_add(const char *file, const char *fmt, ...);
 extern DriveInfo *drive_init(QemuOpts *arg, int default_to_scsi,
diff --git a/hw/esp.c b/hw/esp.c
index 7740879..349052a 100644
--- a/hw/esp.c
+++ b/hw/esp.c
@@ -679,8 +679,7 @@
     qdev_init_gpio_in(&dev->qdev, parent_esp_reset, 1);
 
     scsi_bus_new(&s->bus, &dev->qdev, 0, ESP_MAX_DEVS, esp_command_complete);
-    scsi_bus_legacy_handle_cmdline(&s->bus);
-    return 0;
+    return scsi_bus_legacy_handle_cmdline(&s->bus);
 }
 
 static SysBusDeviceInfo esp_info = {
diff --git a/hw/fdc.c b/hw/fdc.c
index 45a876d..6c74878 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -80,7 +80,6 @@
 } FDiskFlags;
 
 typedef struct FDrive {
-    DriveInfo *dinfo;
     BlockDriverState *bs;
     /* Drive status */
     FDriveType drive;
@@ -100,7 +99,6 @@
 static void fd_init(FDrive *drv)
 {
     /* Drive */
-    drv->bs = drv->dinfo ? drv->dinfo->bdrv : NULL;
     drv->drive = FDRIVE_DRV_NONE;
     drv->perpendicular = 0;
     /* Disk */
@@ -1849,10 +1847,16 @@
 static void fdctrl_connect_drives(FDCtrl *fdctrl)
 {
     unsigned int i;
+    FDrive *drive;
 
     for (i = 0; i < MAX_FD; i++) {
-        fd_init(&fdctrl->drives[i]);
-        fd_revalidate(&fdctrl->drives[i]);
+        drive = &fdctrl->drives[i];
+
+        fd_init(drive);
+        fd_revalidate(drive);
+        if (drive->bs) {
+            bdrv_set_removable(drive->bs, 1);
+        }
     }
 }
 
@@ -1862,10 +1866,10 @@
 
     dev = isa_create("isa-fdc");
     if (fds[0]) {
-        qdev_prop_set_drive(&dev->qdev, "driveA", fds[0]);
+        qdev_prop_set_drive_nofail(&dev->qdev, "driveA", fds[0]->bdrv);
     }
     if (fds[1]) {
-        qdev_prop_set_drive(&dev->qdev, "driveB", fds[1]);
+        qdev_prop_set_drive_nofail(&dev->qdev, "driveB", fds[1]->bdrv);
     }
     if (qdev_init(&dev->qdev) < 0)
         return NULL;
@@ -1884,10 +1888,10 @@
     fdctrl = &sys->state;
     fdctrl->dma_chann = dma_chann; /* FIXME */
     if (fds[0]) {
-        qdev_prop_set_drive(dev, "driveA", fds[0]);
+        qdev_prop_set_drive_nofail(dev, "driveA", fds[0]->bdrv);
     }
     if (fds[1]) {
-        qdev_prop_set_drive(dev, "driveB", fds[1]);
+        qdev_prop_set_drive_nofail(dev, "driveB", fds[1]->bdrv);
     }
     qdev_init_nofail(dev);
     sysbus_connect_irq(&sys->busdev, 0, irq);
@@ -1905,7 +1909,7 @@
 
     dev = qdev_create(NULL, "SUNW,fdtwo");
     if (fds[0]) {
-        qdev_prop_set_drive(dev, "drive", fds[0]);
+        qdev_prop_set_drive_nofail(dev, "drive", fds[0]->bdrv);
     }
     qdev_init_nofail(dev);
     sys = DO_UPCAST(FDCtrlSysBus, busdev.qdev, dev);
@@ -2030,8 +2034,8 @@
     .qdev.vmsd  = &vmstate_isa_fdc,
     .qdev.reset = fdctrl_external_reset_isa,
     .qdev.props = (Property[]) {
-        DEFINE_PROP_DRIVE("driveA", FDCtrlISABus, state.drives[0].dinfo),
-        DEFINE_PROP_DRIVE("driveB", FDCtrlISABus, state.drives[1].dinfo),
+        DEFINE_PROP_DRIVE("driveA", FDCtrlISABus, state.drives[0].bs),
+        DEFINE_PROP_DRIVE("driveB", FDCtrlISABus, state.drives[1].bs),
         DEFINE_PROP_END_OF_LIST(),
     },
 };
@@ -2053,8 +2057,8 @@
     .qdev.vmsd  = &vmstate_sysbus_fdc,
     .qdev.reset = fdctrl_external_reset_sysbus,
     .qdev.props = (Property[]) {
-        DEFINE_PROP_DRIVE("driveA", FDCtrlSysBus, state.drives[0].dinfo),
-        DEFINE_PROP_DRIVE("driveB", FDCtrlSysBus, state.drives[1].dinfo),
+        DEFINE_PROP_DRIVE("driveA", FDCtrlSysBus, state.drives[0].bs),
+        DEFINE_PROP_DRIVE("driveB", FDCtrlSysBus, state.drives[1].bs),
         DEFINE_PROP_END_OF_LIST(),
     },
 };
@@ -2066,7 +2070,7 @@
     .qdev.vmsd  = &vmstate_sysbus_fdc,
     .qdev.reset = fdctrl_external_reset_sysbus,
     .qdev.props = (Property[]) {
-        DEFINE_PROP_DRIVE("drive", FDCtrlSysBus, state.drives[0].dinfo),
+        DEFINE_PROP_DRIVE("drive", FDCtrlSysBus, state.drives[0].bs),
         DEFINE_PROP_END_OF_LIST(),
     },
 };
diff --git a/hw/ide.h b/hw/ide.h
index bb635b6..2b5ae7c 100644
--- a/hw/ide.h
+++ b/hw/ide.h
@@ -1,17 +1,18 @@
 #ifndef HW_IDE_H
 #define HW_IDE_H
 
-#include "qdev.h"
+#include "isa.h"
+#include "pci.h"
 
 /* ide-isa.c */
-int isa_ide_init(int iobase, int iobase2, int isairq,
-                 DriveInfo *hd0, DriveInfo *hd1);
+ISADevice *isa_ide_init(int iobase, int iobase2, int isairq,
+                        DriveInfo *hd0, DriveInfo *hd1);
 
 /* ide-pci.c */
 void pci_cmd646_ide_init(PCIBus *bus, DriveInfo **hd_table,
                          int secondary_ide_enabled);
-void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
-void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
+PCIDevice *pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
+PCIDevice *pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
 void vt82c686b_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
 
 /* ide-macio.c */
@@ -23,4 +24,6 @@
                     qemu_irq irq, int shift,
                     DriveInfo *hd0, DriveInfo *hd1);
 
+void ide_get_bs(BlockDriverState *bs[], BusState *qbus);
+
 #endif /* HW_IDE_H */
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 0b3b7c2..ebdceb5 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -2594,15 +2594,15 @@
     ide_clear_hob(bus);
 }
 
-void ide_init_drive(IDEState *s, DriveInfo *dinfo,
+void ide_init_drive(IDEState *s, BlockDriverState *bs,
                     const char *version, const char *serial)
 {
     int cylinders, heads, secs;
     uint64_t nb_sectors;
 
-    s->bs = dinfo->bdrv;
-    bdrv_get_geometry(s->bs, &nb_sectors);
-    bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
+    s->bs = bs;
+    bdrv_get_geometry(bs, &nb_sectors);
+    bdrv_guess_geometry(bs, &cylinders, &heads, &secs);
     s->cylinders = cylinders;
     s->heads = heads;
     s->sectors = secs;
@@ -2613,11 +2613,11 @@
     s->smart_autosave = 1;
     s->smart_errors = 0;
     s->smart_selftest_count = 0;
-    if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
+    if (bdrv_get_type_hint(bs) == BDRV_TYPE_CDROM) {
         s->is_cdrom = 1;
-        bdrv_set_change_cb(s->bs, cdrom_change_cb, s);
+        bdrv_set_change_cb(bs, cdrom_change_cb, s);
     }
-    if (serial && *serial) {
+    if (serial) {
         strncpy(s->drive_serial_str, serial, sizeof(s->drive_serial_str));
     } else {
         snprintf(s->drive_serial_str, sizeof(s->drive_serial_str),
@@ -2629,6 +2629,7 @@
         pstrcpy(s->version, sizeof(s->version), QEMU_VERSION);
     }
     ide_reset(s);
+    bdrv_set_removable(bs, s->is_cdrom);
 }
 
 static void ide_init1(IDEBus *bus, int unit)
@@ -2668,7 +2669,8 @@
         dinfo = i == 0 ? hd0 : hd1;
         ide_init1(bus, i);
         if (dinfo) {
-            ide_init_drive(&bus->ifs[i], dinfo, NULL, dinfo->serial);
+            ide_init_drive(&bus->ifs[i], dinfo->bdrv, NULL,
+                           *dinfo->serial ? dinfo->serial : NULL);
         } else {
             ide_reset(&bus->ifs[i]);
         }
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index eef1ee1..0125a9f 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -555,7 +555,7 @@
 void ide_data_writel(void *opaque, uint32_t addr, uint32_t val);
 uint32_t ide_data_readl(void *opaque, uint32_t addr);
 
-void ide_init_drive(IDEState *s, DriveInfo *dinfo,
+void ide_init_drive(IDEState *s, BlockDriverState *bs,
                     const char *version, const char *serial);
 void ide_init2(IDEBus *bus, qemu_irq irq);
 void ide_init2_with_non_qdev_drives(IDEBus *bus, DriveInfo *hd0,
diff --git a/hw/ide/isa.c b/hw/ide/isa.c
index b6c6347..10777ca 100644
--- a/hw/ide/isa.c
+++ b/hw/ide/isa.c
@@ -75,8 +75,8 @@
     return 0;
 };
 
-int isa_ide_init(int iobase, int iobase2, int isairq,
-                 DriveInfo *hd0, DriveInfo *hd1)
+ISADevice *isa_ide_init(int iobase, int iobase2, int isairq,
+                        DriveInfo *hd0, DriveInfo *hd1)
 {
     ISADevice *dev;
     ISAIDEState *s;
@@ -86,14 +86,14 @@
     qdev_prop_set_uint32(&dev->qdev, "iobase2", iobase2);
     qdev_prop_set_uint32(&dev->qdev, "irq",     isairq);
     if (qdev_init(&dev->qdev) < 0)
-        return -1;
+        return NULL;
 
     s = DO_UPCAST(ISAIDEState, dev, dev);
     if (hd0)
         ide_create_drive(&s->bus, 0, hd0);
     if (hd1)
         ide_create_drive(&s->bus, 1, hd1);
-    return 0;
+    return dev;
 }
 
 static ISADeviceInfo isa_ide_info = {
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index dad6e86..fa22226 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -160,22 +160,24 @@
 
 /* hd_table must contain 4 block drivers */
 /* NOTE: for the PIIX3, the IRQs and IOports are hardcoded */
-void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
+PCIDevice *pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
 {
     PCIDevice *dev;
 
     dev = pci_create_simple(bus, devfn, "piix3-ide");
     pci_ide_create_devs(dev, hd_table);
+    return dev;
 }
 
 /* hd_table must contain 4 block drivers */
 /* NOTE: for the PIIX4, the IRQs and IOports are hardcoded */
-void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
+PCIDevice *pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
 {
     PCIDevice *dev;
 
     dev = pci_create_simple(bus, devfn, "piix4-ide");
     pci_ide_create_devs(dev, hd_table);
+    return dev;
 }
 
 static PCIDeviceInfo piix_ide_info[] = {
diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 0f9f22e..2977a16 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -39,7 +39,7 @@
     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;
     }
@@ -83,12 +83,18 @@
 
     dev = qdev_create(&bus->qbus, "ide-drive");
     qdev_prop_set_uint32(dev, "unit", unit);
-    qdev_prop_set_drive(dev, "drive", drive);
-    if (qdev_init(dev) < 0)
-        return NULL;
+    qdev_prop_set_drive_nofail(dev, "drive", drive->bdrv);
+    qdev_init_nofail(dev);
     return DO_UPCAST(IDEDevice, qdev, dev);
 }
 
+void ide_get_bs(BlockDriverState *bs[], BusState *qbus)
+{
+    IDEBus *bus = DO_UPCAST(IDEBus, qbus, qbus);
+    bs[0] = bus->master ? bus->master->conf.bs : NULL;
+    bs[1] = bus->slave  ? bus->slave->conf.bs  : NULL;
+}
+
 /* --------------------------------- */
 
 typedef struct IDEDrive {
@@ -100,14 +106,18 @@
     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);
diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c
index 9a37fed..1bb1caf 100644
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@@ -2176,7 +2176,7 @@
 
     scsi_bus_new(&s->bus, &dev->qdev, 1, LSI_MAX_DEVS, lsi_command_complete);
     if (!dev->qdev.hotplugged) {
-        scsi_bus_legacy_handle_cmdline(&s->bus);
+        return scsi_bus_legacy_handle_cmdline(&s->bus);
     }
     return 0;
 }
diff --git a/hw/pc.c b/hw/pc.c
index 25ebafa..b577fb1 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -25,6 +25,7 @@
 #include "pc.h"
 #include "apic.h"
 #include "fdc.h"
+#include "ide.h"
 #include "pci.h"
 #include "vmware_vga.h"
 #include "monitor.h"
@@ -275,14 +276,65 @@
     return set_boot_dev(opaque, boot_device, 0);
 }
 
-/* hd_table must contain 4 block drivers */
+typedef struct pc_cmos_init_late_arg {
+    ISADevice *rtc_state;
+    BusState *idebus0, *idebus1;
+} pc_cmos_init_late_arg;
+
+static void pc_cmos_init_late(void *opaque)
+{
+    pc_cmos_init_late_arg *arg = opaque;
+    ISADevice *s = arg->rtc_state;
+    int val;
+    BlockDriverState *hd_table[4];
+    int i;
+
+    ide_get_bs(hd_table, arg->idebus0);
+    ide_get_bs(hd_table + 2, arg->idebus1);
+
+    rtc_set_memory(s, 0x12, (hd_table[0] ? 0xf0 : 0) | (hd_table[1] ? 0x0f : 0));
+    if (hd_table[0])
+        cmos_init_hd(0x19, 0x1b, hd_table[0], s);
+    if (hd_table[1])
+        cmos_init_hd(0x1a, 0x24, hd_table[1], s);
+
+    val = 0;
+    for (i = 0; i < 4; i++) {
+        if (hd_table[i]) {
+            int cylinders, heads, sectors, translation;
+            /* NOTE: bdrv_get_geometry_hint() returns the physical
+                geometry.  It is always such that: 1 <= sects <= 63, 1
+                <= heads <= 16, 1 <= cylinders <= 16383. The BIOS
+                geometry can be different if a translation is done. */
+            translation = bdrv_get_translation_hint(hd_table[i]);
+            if (translation == BIOS_ATA_TRANSLATION_AUTO) {
+                bdrv_get_geometry_hint(hd_table[i], &cylinders, &heads, &sectors);
+                if (cylinders <= 1024 && heads <= 16 && sectors <= 63) {
+                    /* No translation. */
+                    translation = 0;
+                } else {
+                    /* LBA translation. */
+                    translation = 1;
+                }
+            } else {
+                translation--;
+            }
+            val |= translation << (i * 2);
+        }
+    }
+    rtc_set_memory(s, 0x39, val);
+
+    qemu_unregister_reset(pc_cmos_init_late, opaque);
+}
+
 void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
-                  const char *boot_device, DriveInfo **hd_table,
+                  const char *boot_device,
+                  BusState *idebus0, BusState *idebus1,
                   FDCtrl *floppy_controller, ISADevice *s)
 {
     int val;
     int fd0, fd1, nb;
-    int i;
+    static pc_cmos_init_late_arg arg;
 
     /* various important CMOS locations needed by PC/Bochs bios */
 
@@ -351,38 +403,10 @@
     rtc_set_memory(s, REG_EQUIPMENT_BYTE, val);
 
     /* hard drives */
-
-    rtc_set_memory(s, 0x12, (hd_table[0] ? 0xf0 : 0) | (hd_table[1] ? 0x0f : 0));
-    if (hd_table[0])
-        cmos_init_hd(0x19, 0x1b, hd_table[0]->bdrv, s);
-    if (hd_table[1])
-        cmos_init_hd(0x1a, 0x24, hd_table[1]->bdrv, s);
-
-    val = 0;
-    for (i = 0; i < 4; i++) {
-        if (hd_table[i]) {
-            int cylinders, heads, sectors, translation;
-            /* NOTE: bdrv_get_geometry_hint() returns the physical
-                geometry.  It is always such that: 1 <= sects <= 63, 1
-                <= heads <= 16, 1 <= cylinders <= 16383. The BIOS
-                geometry can be different if a translation is done. */
-            translation = bdrv_get_translation_hint(hd_table[i]->bdrv);
-            if (translation == BIOS_ATA_TRANSLATION_AUTO) {
-                bdrv_get_geometry_hint(hd_table[i]->bdrv, &cylinders, &heads, &sectors);
-                if (cylinders <= 1024 && heads <= 16 && sectors <= 63) {
-                    /* No translation. */
-                    translation = 0;
-                } else {
-                    /* LBA translation. */
-                    translation = 1;
-                }
-            } else {
-                translation--;
-            }
-            val |= translation << (i * 2);
-        }
-    }
-    rtc_set_memory(s, 0x39, val);
+    arg.rtc_state = s;
+    arg.idebus0 = idebus0;
+    arg.idebus1 = idebus1;
+    qemu_register_reset(pc_cmos_init_late, &arg);
 }
 
 static void handle_a20_line_change(void *opaque, int irq, int level)
diff --git a/hw/pc.h b/hw/pc.h
index ccfd7ad..63b0249 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -104,7 +104,8 @@
 void pc_audio_init (PCIBus *pci_bus, qemu_irq *pic);
 #endif
 void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
-                  const char *boot_device, DriveInfo **hd_table,
+                  const char *boot_device,
+                  BusState *ide0, BusState *ide1,
                   FDCtrl *floppy_controller, ISADevice *s);
 void pc_pci_device_init(PCIBus *pci_bus);
 
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index f670fd7..519e8a5 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -79,6 +79,7 @@
     IsaIrqState *isa_irq_state;
     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     FDCtrl *floppy_controller;
+    BusState *idebus[MAX_IDE_BUS];
     ISADevice *rtc_state;
 
     pc_cpus_init(cpu_model);
@@ -132,18 +133,23 @@
     }
 
     if (pci_enabled) {
-        pci_piix3_ide_init(pci_bus, hd, piix3_devfn + 1);
+        PCIDevice *dev;
+        dev = pci_piix3_ide_init(pci_bus, hd, piix3_devfn + 1);
+        idebus[0] = qdev_get_child_bus(&dev->qdev, "ide.0");
+        idebus[1] = qdev_get_child_bus(&dev->qdev, "ide.1");
     } else {
         for(i = 0; i < MAX_IDE_BUS; i++) {
-            isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
-	                 hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]);
+            ISADevice *dev;
+            dev = isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
+                               hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]);
+            idebus[i] = qdev_get_child_bus(&dev->qdev, "ide.0");
         }
     }
 
     pc_audio_init(pci_enabled ? pci_bus : NULL, isa_irq);
 
-    pc_cmos_init(below_4g_mem_size, above_4g_mem_size, boot_device, hd,
-                 floppy_controller, rtc_state);
+    pc_cmos_init(below_4g_mem_size, above_4g_mem_size, boot_device,
+                 idebus[0], idebus[1], floppy_controller, rtc_state);
 
     if (pci_enabled && usb_enabled) {
         usb_uhci_piix3_init(pci_bus, piix3_devfn + 2);
diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
index c39e640..fe468d6 100644
--- a/hw/pci-hotplug.c
+++ b/hw/pci-hotplug.c
@@ -89,7 +89,10 @@
      * specified).
      */
     dinfo->unit = qemu_opt_get_number(dinfo->opts, "unit", -1);
-    scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo, dinfo->unit);
+    scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo->bdrv, dinfo->unit);
+    if (!scsidev) {
+        return -1;
+    }
     dinfo->unit = scsidev->id;
 
     if (printinfo)
@@ -211,7 +214,11 @@
             return NULL;
         }
         dev = pci_create(bus, devfn, "virtio-blk-pci");
-        qdev_prop_set_drive(&dev->qdev, "drive", dinfo);
+        if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
+            qdev_free(&dev->qdev);
+            dev = NULL;
+            break;
+        }
         if (qdev_init(&dev->qdev) < 0)
             dev = NULL;
         break;
diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 5b7fd77..7e3e99e 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -305,26 +305,42 @@
 
 static int parse_drive(DeviceState *dev, Property *prop, const char *str)
 {
-    DriveInfo **ptr = qdev_get_prop_ptr(dev, prop);
+    BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
+    BlockDriverState *bs;
 
-    *ptr = drive_get_by_id(str);
-    if (*ptr == NULL)
+    bs = bdrv_find(str);
+    if (bs == NULL)
         return -ENOENT;
+    if (bdrv_attach(bs, dev) < 0)
+        return -EEXIST;
+    *ptr = bs;
     return 0;
 }
 
+static void free_drive(DeviceState *dev, Property *prop)
+{
+    BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
+
+    if (*ptr) {
+        bdrv_detach(*ptr, dev);
+        blockdev_auto_del(*ptr);
+    }
+}
+
 static int print_drive(DeviceState *dev, Property *prop, char *dest, size_t len)
 {
-    DriveInfo **ptr = qdev_get_prop_ptr(dev, prop);
-    return snprintf(dest, len, "%s", (*ptr) ? (*ptr)->id : "<null>");
+    BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
+    return snprintf(dest, len, "%s",
+                    *ptr ? bdrv_get_device_name(*ptr) : "<null>");
 }
 
 PropertyInfo qdev_prop_drive = {
     .name  = "drive",
     .type  = PROP_TYPE_DRIVE,
-    .size  = sizeof(DriveInfo*),
+    .size  = sizeof(BlockDriverState *),
     .parse = parse_drive,
     .print = print_drive,
+    .free  = free_drive,
 };
 
 /* --- character device --- */
@@ -647,11 +663,28 @@
     qdev_prop_set(dev, name, &value, PROP_TYPE_STRING);
 }
 
-void qdev_prop_set_drive(DeviceState *dev, const char *name, DriveInfo *value)
+int qdev_prop_set_drive(DeviceState *dev, const char *name, BlockDriverState *value)
 {
+    int res;
+
+    res = bdrv_attach(value, dev);
+    if (res < 0) {
+        error_report("Can't attach drive %s to %s.%s: %s",
+                     bdrv_get_device_name(value),
+                     dev->id ? dev->id : dev->info->name,
+                     name, strerror(-res));
+        return -1;
+    }
     qdev_prop_set(dev, name, &value, PROP_TYPE_DRIVE);
+    return 0;
 }
 
+void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name, BlockDriverState *value)
+{
+    if (qdev_prop_set_drive(dev, name, value) < 0) {
+        exit(1);
+    }
+}
 void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value)
 {
     qdev_prop_set(dev, name, &value, PROP_TYPE_CHR);
diff --git a/hw/qdev.h b/hw/qdev.h
index be5ad67..cbc89f2 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -253,8 +253,8 @@
     DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, VLANClientState*)
 #define DEFINE_PROP_VLAN(_n, _s, _f)             \
     DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, VLANState*)
-#define DEFINE_PROP_DRIVE(_n, _s, _f)             \
-    DEFINE_PROP(_n, _s, _f, qdev_prop_drive, DriveInfo*)
+#define DEFINE_PROP_DRIVE(_n, _s, _f) \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockDriverState *)
 #define DEFINE_PROP_MACADDR(_n, _s, _f)         \
     DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
 
@@ -275,7 +275,8 @@
 void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value);
 void qdev_prop_set_netdev(DeviceState *dev, const char *name, VLANClientState *value);
 void qdev_prop_set_vlan(DeviceState *dev, const char *name, VLANState *value);
-void qdev_prop_set_drive(DeviceState *dev, const char *name, DriveInfo *value);
+int qdev_prop_set_drive(DeviceState *dev, const char *name, BlockDriverState *value) QEMU_WARN_UNUSED_RESULT;
+void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name, BlockDriverState *value);
 void qdev_prop_set_macaddr(DeviceState *dev, const char *name, uint8_t *value);
 /* FIXME: Remove opaque pointer properties.  */
 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
index 898f442..6af58e2 100644
--- a/hw/s390-virtio.c
+++ b/hw/s390-virtio.c
@@ -262,7 +262,7 @@
         }
 
         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
-        qdev_prop_set_drive(dev, "drive", dinfo);
+        qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
         qdev_init_nofail(dev);
     }
 }
diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index 24bd060..b84b9b9 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -83,33 +83,39 @@
 }
 
 /* handle legacy '-drive if=scsi,...' cmd line args */
-/* FIXME callers should check for failure, but don't */
-SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit)
+SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv, int unit)
 {
     const char *driver;
     DeviceState *dev;
 
-    driver = bdrv_is_sg(dinfo->bdrv) ? "scsi-generic" : "scsi-disk";
+    driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
     dev = qdev_create(&bus->qbus, driver);
     qdev_prop_set_uint32(dev, "scsi-id", unit);
-    qdev_prop_set_drive(dev, "drive", dinfo);
+    if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
+        qdev_free(dev);
+        return NULL;
+    }
     if (qdev_init(dev) < 0)
         return NULL;
     return DO_UPCAST(SCSIDevice, qdev, dev);
 }
 
-void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
+int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 {
     DriveInfo *dinfo;
-    int unit;
+    int res = 0, unit;
 
     for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
         if (dinfo == NULL) {
             continue;
         }
-        scsi_bus_legacy_add_drive(bus, dinfo, unit);
+        if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit)) {
+            res = -1;
+            break;
+        }
     }
+    return res;
 }
 
 void scsi_dev_clear_sense(SCSIDevice *dev)
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 2b38984..3e41011 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1043,26 +1043,26 @@
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 
     scsi_disk_purge_requests(s);
-    drive_uninit(s->qdev.conf.dinfo);
+    blockdev_mark_auto_del(s->qdev.conf.bs);
 }
 
 static int scsi_disk_initfn(SCSIDevice *dev)
 {
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
+    int is_cd;
+    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;
+    is_cd = bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM;
 
     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) {
@@ -1074,7 +1074,7 @@
         return -1;
     }
 
-    if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
+    if (is_cd) {
         s->qdev.blocksize = 2048;
     } else {
         s->qdev.blocksize = s->qdev.conf.logical_block_size;
@@ -1083,6 +1083,7 @@
 
     s->qdev.type = TYPE_DISK;
     qemu_add_vm_change_state_handler(scsi_dma_restart_cb, s);
+    bdrv_set_removable(s->bs, is_cd);
     return 0;
 }
 
diff --git a/hw/scsi-generic.c b/hw/scsi-generic.c
index e31060e..3915e78 100644
--- a/hw/scsi-generic.c
+++ b/hw/scsi-generic.c
@@ -453,7 +453,7 @@
         r = DO_UPCAST(SCSIGenericReq, req, QTAILQ_FIRST(&s->qdev.requests));
         scsi_remove_request(r);
     }
-    drive_uninit(s->qdev.conf.dinfo);
+    blockdev_mark_auto_del(s->qdev.conf.bs);
 }
 
 static int scsi_generic_initfn(SCSIDevice *dev)
@@ -462,11 +462,11 @@
     int sg_version;
     struct sg_scsi_id scsiid;
 
-    if (!s->qdev.conf.dinfo || !s->qdev.conf.dinfo->bdrv) {
+    if (!s->qdev.conf.bs) {
         error_report("scsi-generic: drive property not set");
         return -1;
     }
-    s->bs = s->qdev.conf.dinfo->bdrv;
+    s->bs = s->qdev.conf.bs;
 
     /* check we are really using a /dev/sg* file */
     if (!bdrv_is_sg(s->bs)) {
@@ -509,6 +509,7 @@
     DPRINTF("block size %d\n", s->qdev.blocksize);
     s->driver_status = 0;
     memset(s->sensebuf, 0, sizeof(s->sensebuf));
+    bdrv_set_removable(s->bs, 0);
     return 0;
 }
 
diff --git a/hw/scsi.h b/hw/scsi.h
index b668e27..4fbf1d5 100644
--- a/hw/scsi.h
+++ b/hw/scsi.h
@@ -97,8 +97,8 @@
     return DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus);
 }
 
-SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit);
-void scsi_bus_legacy_handle_cmdline(SCSIBus *bus);
+SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv, int unit);
+int scsi_bus_legacy_handle_cmdline(SCSIBus *bus);
 
 void scsi_dev_clear_sense(SCSIDevice *dev);
 void scsi_dev_set_sense(SCSIDevice *dev, uint8_t key);
diff --git a/hw/usb-msd.c b/hw/usb-msd.c
index 003bd8a..65e9624 100644
--- a/hw/usb-msd.c
+++ b/hw/usb-msd.c
@@ -522,22 +522,37 @@
 static int usb_msd_initfn(USBDevice *dev)
 {
     MSDState *s = DO_UPCAST(MSDState, dev, dev);
+    BlockDriverState *bs = s->conf.bs;
 
-    if (!s->conf.dinfo || !s->conf.dinfo->bdrv) {
+    if (!bs) {
         error_report("usb-msd: drive property not set");
         return -1;
     }
 
+    /*
+     * Hack alert: this pretends to be a block device, but it's really
+     * a SCSI bus that can serve only a single device, which it
+     * creates automatically.  But first it needs to detach from its
+     * blockdev, or else scsi_bus_legacy_add_drive() dies when it
+     * attaches again.
+     *
+     * The hack is probably a bad idea.
+     */
+    bdrv_detach(bs, &s->dev.qdev);
+    s->conf.bs = NULL;
+
     s->dev.speed = USB_SPEED_FULL;
     scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, usb_msd_command_complete);
-    s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, s->conf.dinfo, 0);
+    s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0);
+    if (!s->scsi_dev) {
+        return -1;
+    }
     s->bus.qbus.allow_hotplug = 0;
     usb_msd_handle_reset(dev);
 
-    if (bdrv_key_required(s->conf.dinfo->bdrv)) {
+    if (bdrv_key_required(bs)) {
         if (cur_mon) {
-            monitor_read_bdrv_key_start(cur_mon, s->conf.dinfo->bdrv,
-                                        usb_msd_password_cb, s);
+            monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
             s->dev.auto_attach = 0;
         } else {
             autostart = 0;
@@ -595,7 +610,10 @@
     if (!dev) {
         return NULL;
     }
-    qdev_prop_set_drive(&dev->qdev, "drive", dinfo);
+    if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
+        qdev_free(&dev->qdev);
+        return NULL;
+    }
     if (qdev_init(&dev->qdev) < 0)
         return NULL;
 
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 0bf929a..f0b3ba5 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -489,7 +489,7 @@
     s->vdev.get_config = virtio_blk_update_config;
     s->vdev.get_features = virtio_blk_get_features;
     s->vdev.reset = virtio_blk_reset;
-    s->bs = conf->dinfo->bdrv;
+    s->bs = conf->bs;
     s->conf = conf;
     s->rq = NULL;
     s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
@@ -500,6 +500,7 @@
     qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
     register_savevm("virtio-blk", virtio_blk_id++, 2,
                     virtio_blk_save, virtio_blk_load, s);
+    bdrv_set_removable(s->bs, 0);
 
     return &s->vdev;
 }
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index d1303b1..c6ef825 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -547,7 +547,7 @@
         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 
-    if (!proxy->block.dinfo) {
+    if (!proxy->block.bs) {
         error_report("virtio-blk-pci: drive property not set");
         return -1;
     }
@@ -571,7 +571,7 @@
 {
     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 
-    drive_uninit(proxy->block.dinfo);
+    blockdev_mark_auto_del(proxy->block.bs);
     return virtio_exit_pci(pci_dev);
 }
 
diff --git a/qemu-img.c b/qemu-img.c
index ea091f0..700af21 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -39,14 +39,13 @@
 /* Default to cache=writeback as data integrity is not important for qemu-tcg. */
 #define BDRV_O_FLAGS BDRV_O_CACHE_WB
 
-static void QEMU_NORETURN error(const char *fmt, ...)
+static void error(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
     fprintf(stderr, "qemu-img: ");
     vfprintf(stderr, fmt, ap);
     fprintf(stderr, "\n");
-    exit(1);
     va_end(ap);
 }
 
@@ -197,57 +196,76 @@
     char password[256];
 
     bs = bdrv_new("");
-    if (!bs)
+    if (!bs) {
         error("Not enough memory");
+        goto fail;
+    }
     if (fmt) {
         drv = bdrv_find_format(fmt);
-        if (!drv)
+        if (!drv) {
             error("Unknown file format '%s'", fmt);
+            goto fail;
+        }
     } else {
         drv = NULL;
     }
     if (bdrv_open(bs, filename, flags, drv) < 0) {
         error("Could not open '%s'", filename);
+        goto fail;
     }
     if (bdrv_is_encrypted(bs)) {
         printf("Disk image '%s' is encrypted.\n", filename);
-        if (read_password(password, sizeof(password)) < 0)
+        if (read_password(password, sizeof(password)) < 0) {
             error("No password given");
-        if (bdrv_set_key(bs, password) < 0)
+            goto fail;
+        }
+        if (bdrv_set_key(bs, password) < 0) {
             error("invalid password");
+            goto fail;
+        }
     }
     return bs;
+fail:
+    if (bs) {
+        bdrv_delete(bs);
+    }
+    return NULL;
 }
 
-static void add_old_style_options(const char *fmt, QEMUOptionParameter *list,
+static int add_old_style_options(const char *fmt, QEMUOptionParameter *list,
     int flags, const char *base_filename, const char *base_fmt)
 {
     if (flags & BLOCK_FLAG_ENCRYPT) {
         if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) {
             error("Encryption not supported for file format '%s'", fmt);
+            return -1;
         }
     }
     if (flags & BLOCK_FLAG_COMPAT6) {
         if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) {
             error("VMDK version 6 not supported for file format '%s'", fmt);
+            return -1;
         }
     }
 
     if (base_filename) {
         if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
             error("Backing file not supported for file format '%s'", fmt);
+            return -1;
         }
     }
     if (base_fmt) {
         if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
             error("Backing file format not supported for file format '%s'", fmt);
+            return -1;
         }
     }
+    return 0;
 }
 
 static int img_create(int argc, char **argv)
 {
-    int c, ret, flags;
+    int c, ret = 0, flags;
     const char *fmt = "raw";
     const char *base_fmt = NULL;
     const char *filename;
@@ -293,12 +311,16 @@
 
     /* Find driver and parse its options */
     drv = bdrv_find_format(fmt);
-    if (!drv)
+    if (!drv) {
         error("Unknown file format '%s'", fmt);
+        return 1;
+    }
 
     proto_drv = bdrv_find_protocol(filename);
-    if (!proto_drv)
+    if (!proto_drv) {
         error("Unknown protocol '%s'", filename);
+        return 1;
+    }
 
     create_options = append_option_parameters(create_options,
                                               drv->create_options);
@@ -307,7 +329,7 @@
 
     if (options && !strcmp(options, "?")) {
         print_option_help(create_options);
-        return 0;
+        goto out;
     }
 
     /* Create parameter list with default values */
@@ -319,6 +341,8 @@
         param = parse_option_parameters(options, create_options, param);
         if (param == NULL) {
             error("Invalid options for file format '%s'.", fmt);
+            ret = -1;
+            goto out;
         }
     }
 
@@ -328,7 +352,10 @@
     }
 
     /* Add old-style options to parameters */
-    add_old_style_options(fmt, param, flags, base_filename, base_fmt);
+    ret = add_old_style_options(fmt, param, flags, base_filename, base_fmt);
+    if (ret < 0) {
+        goto out;
+    }
 
     // The size for the image must always be specified, with one exception:
     // If we are using a backing file, we can obtain the size from there
@@ -351,10 +378,16 @@
                 } else {
                      error("Unknown backing file format '%s'",
                         backing_fmt->value.s);
+                     ret = -1;
+                     goto out;
                 }
             }
 
             bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS);
+            if (!bs) {
+                ret = -1;
+                goto out;
+            }
             bdrv_get_geometry(bs, &size);
             size *= 512;
             bdrv_delete(bs);
@@ -363,6 +396,8 @@
             set_option_parameter(param, BLOCK_OPT_SIZE, buf);
         } else {
             error("Image creation needs a size parameter");
+            ret = -1;
+            goto out;
         }
     }
 
@@ -383,6 +418,10 @@
             error("%s: error while creating %s: %s", filename, fmt, strerror(-ret));
         }
     }
+out:
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
@@ -411,6 +450,9 @@
     filename = argv[optind++];
 
     bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS);
+    if (!bs) {
+        return 1;
+    }
     ret = bdrv_check(bs);
     switch(ret) {
     case 0:
@@ -429,6 +471,9 @@
     }
 
     bdrv_delete(bs);
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
@@ -457,6 +502,9 @@
     filename = argv[optind++];
 
     bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
+    if (!bs) {
+        return 1;
+    }
     ret = bdrv_commit(bs);
     switch(ret) {
     case 0:
@@ -477,6 +525,9 @@
     }
 
     bdrv_delete(bs);
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
@@ -551,13 +602,13 @@
 
 static int img_convert(int argc, char **argv)
 {
-    int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
+    int c, ret = 0, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
     const char *fmt, *out_fmt, *out_baseimg, *out_filename;
     BlockDriver *drv, *proto_drv;
-    BlockDriverState **bs, *out_bs;
+    BlockDriverState **bs = NULL, *out_bs = NULL;
     int64_t total_sectors, nb_sectors, sector_num, bs_offset;
     uint64_t bs_sectors;
-    uint8_t * buf;
+    uint8_t * buf = NULL;
     const uint8_t *buf1;
     BlockDriverInfo bdi;
     QEMUOptionParameter *param = NULL, *create_options = NULL;
@@ -604,30 +655,43 @@
 
     out_filename = argv[argc - 1];
 
-    if (bs_n > 1 && out_baseimg)
+    if (bs_n > 1 && out_baseimg) {
         error("-B makes no sense when concatenating multiple input images");
+        return 1;
+    }
         
     bs = calloc(bs_n, sizeof(BlockDriverState *));
-    if (!bs)
+    if (!bs) {
         error("Out of memory");
+        return 1;
+    }
 
     total_sectors = 0;
     for (bs_i = 0; bs_i < bs_n; bs_i++) {
         bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS);
-        if (!bs[bs_i])
+        if (!bs[bs_i]) {
             error("Could not open '%s'", argv[optind + bs_i]);
+            ret = -1;
+            goto out;
+        }
         bdrv_get_geometry(bs[bs_i], &bs_sectors);
         total_sectors += bs_sectors;
     }
 
     /* Find driver and parse its options */
     drv = bdrv_find_format(out_fmt);
-    if (!drv)
+    if (!drv) {
         error("Unknown file format '%s'", out_fmt);
+        ret = -1;
+        goto out;
+    }
 
     proto_drv = bdrv_find_protocol(out_filename);
-    if (!proto_drv)
+    if (!proto_drv) {
         error("Unknown protocol '%s'", out_filename);
+        ret = -1;
+        goto out;
+    }
 
     create_options = append_option_parameters(create_options,
                                               drv->create_options);
@@ -635,21 +699,25 @@
                                               proto_drv->create_options);
     if (options && !strcmp(options, "?")) {
         print_option_help(create_options);
-        free(bs);
-        return 0;
+        goto out;
     }
 
     if (options) {
         param = parse_option_parameters(options, create_options, param);
         if (param == NULL) {
             error("Invalid options for file format '%s'.", out_fmt);
+            ret = -1;
+            goto out;
         }
     } else {
         param = parse_option_parameters("", create_options, param);
     }
 
     set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
-    add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
+    ret = add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
+    if (ret < 0) {
+        goto out;
+    }
 
     /* Check if compression is supported */
     if (flags & BLOCK_FLAG_COMPRESS) {
@@ -658,18 +726,19 @@
 
         if (!drv->bdrv_write_compressed) {
             error("Compression not supported for this file format");
+            ret = -1;
+            goto out;
         }
 
         if (encryption && encryption->value.n) {
             error("Compression and encryption not supported at the same time");
+            ret = -1;
+            goto out;
         }
     }
 
     /* Create the new image */
     ret = bdrv_create(drv, out_filename, param);
-    free_option_parameters(create_options);
-    free_option_parameters(param);
-
     if (ret < 0) {
         if (ret == -ENOTSUP) {
             error("Formatting not supported for file format '%s'", out_fmt);
@@ -678,9 +747,14 @@
         } else {
             error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret));
         }
+        goto out;
     }
 
     out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
+    if (!out_bs) {
+        ret = -1;
+        goto out;
+    }
 
     bs_i = 0;
     bs_offset = 0;
@@ -688,11 +762,17 @@
     buf = qemu_malloc(IO_BUF_SIZE);
 
     if (flags & BLOCK_FLAG_COMPRESS) {
-        if (bdrv_get_info(out_bs, &bdi) < 0)
+        ret = bdrv_get_info(out_bs, &bdi);
+        if (ret < 0) {
             error("could not get block driver info");
+            goto out;
+        }
         cluster_size = bdi.cluster_size;
-        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
+        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) {
             error("invalid cluster size");
+            ret = -1;
+            goto out;
+        }
         cluster_sectors = cluster_size >> 9;
         sector_num = 0;
         for(;;) {
@@ -728,8 +808,11 @@
 
                 nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
 
-                if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) 
+                ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow);
+                if (ret < 0) {
                     error("error while reading");
+                    goto out;
+                }
 
                 buf2 += nlow * 512;
                 bs_num += nlow;
@@ -741,10 +824,13 @@
             if (n < cluster_sectors)
                 memset(buf + n * 512, 0, cluster_size - n * 512);
             if (is_not_zero(buf, cluster_size)) {
-                if (bdrv_write_compressed(out_bs, sector_num, buf,
-                                          cluster_sectors) != 0)
+                ret = bdrv_write_compressed(out_bs, sector_num, buf,
+                                            cluster_sectors);
+                if (ret != 0) {
                     error("error while compressing sector %" PRId64,
                           sector_num);
+                    goto out;
+                }
             }
             sector_num += n;
         }
@@ -795,8 +881,11 @@
                 n1 = n;
             }
 
-            if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) 
+            ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n);
+            if (ret < 0) {
                 error("error while reading");
+                goto out;
+            }
             /* NOTE: at the same time we convert, we do not write zero
                sectors to have a chance to compress the image. Ideally, we
                should add a specific call to have the info to go faster */
@@ -811,8 +900,11 @@
                    already there is garbage, not 0s. */
                 if (!has_zero_init || out_baseimg ||
                     is_allocated_sectors(buf1, n, &n1)) {
-                    if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
+                    ret = bdrv_write(out_bs, sector_num, buf1, n1);
+                    if (ret < 0) {
                         error("error while writing");
+                        goto out;
+                    }
                 }
                 sector_num += n1;
                 n -= n1;
@@ -820,11 +912,22 @@
             }
         }
     }
+out:
+    free_option_parameters(create_options);
+    free_option_parameters(param);
     qemu_free(buf);
-    bdrv_delete(out_bs);
-    for (bs_i = 0; bs_i < bs_n; bs_i++)
-        bdrv_delete(bs[bs_i]);
+    if (out_bs) {
+        bdrv_delete(out_bs);
+    }
+    for (bs_i = 0; bs_i < bs_n; bs_i++) {
+        if (bs[bs_i]) {
+            bdrv_delete(bs[bs_i]);
+        }
+    }
     free(bs);
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
@@ -907,6 +1010,9 @@
     filename = argv[optind++];
 
     bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING);
+    if (!bs) {
+        return 1;
+    }
     bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
     bdrv_get_geometry(bs, &total_sectors);
     get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
@@ -952,7 +1058,7 @@
     BlockDriverState *bs;
     QEMUSnapshotInfo sn;
     char *filename, *snapshot_name = NULL;
-    int c, ret, bdrv_oflags;
+    int c, ret = 0, bdrv_oflags;
     int action = 0;
     qemu_timeval tv;
 
@@ -1007,6 +1113,9 @@
 
     /* Open the image */
     bs = bdrv_new_open(filename, NULL, bdrv_oflags);
+    if (!bs) {
+        return 1;
+    }
 
     /* Perform the requested action */
     switch(action) {
@@ -1045,13 +1154,15 @@
 
     /* Cleanup */
     bdrv_delete(bs);
-
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
 static int img_rebase(int argc, char **argv)
 {
-    BlockDriverState *bs, *bs_old_backing, *bs_new_backing;
+    BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL;
     BlockDriver *old_backing_drv, *new_backing_drv;
     char *filename;
     const char *fmt, *out_basefmt, *out_baseimg;
@@ -1098,6 +1209,9 @@
      */
     flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
     bs = bdrv_new_open(filename, fmt, flags);
+    if (!bs) {
+        return 1;
+    }
 
     /* Find the right drivers for the backing files */
     old_backing_drv = NULL;
@@ -1107,6 +1221,8 @@
         old_backing_drv = bdrv_find_format(bs->backing_format);
         if (old_backing_drv == NULL) {
             error("Invalid format name: '%s'", bs->backing_format);
+            ret = -1;
+            goto out;
         }
     }
 
@@ -1114,6 +1230,8 @@
         new_backing_drv = bdrv_find_format(out_basefmt);
         if (new_backing_drv == NULL) {
             error("Invalid format name: '%s'", out_basefmt);
+            ret = -1;
+            goto out;
         }
     }
 
@@ -1127,19 +1245,19 @@
 
         bs_old_backing = bdrv_new("old_backing");
         bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
-        if (bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS,
-            old_backing_drv))
-        {
+        ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS,
+                        old_backing_drv);
+        if (ret) {
             error("Could not open old backing file '%s'", backing_name);
-            return -1;
+            goto out;
         }
 
         bs_new_backing = bdrv_new("new_backing");
-        if (bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR,
-            new_backing_drv))
-        {
+        ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR,
+                        new_backing_drv);
+        if (ret) {
             error("Could not open new backing file '%s'", out_baseimg);
-            return -1;
+            goto out;
         }
     }
 
@@ -1180,11 +1298,15 @@
             }
 
             /* Read old and new backing file */
-            if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) {
+            ret = bdrv_read(bs_old_backing, sector, buf_old, n);
+            if (ret < 0) {
                 error("error while reading from old backing file");
+                goto out;
             }
-            if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) {
+            ret = bdrv_read(bs_new_backing, sector, buf_new, n);
+            if (ret < 0) {
                 error("error while reading from new backing file");
+                goto out;
             }
 
             /* If they differ, we need to write to the COW file */
@@ -1201,6 +1323,7 @@
                     if (ret < 0) {
                         error("Error while writing to COW image: %s",
                             strerror(-ret));
+                        goto out;
                     }
                 }
 
@@ -1232,7 +1355,7 @@
      * could be dropped from the COW file. Don't do this before switching the
      * backing file, in case of a crash this would lead to corruption.
      */
-
+out:
     /* Cleanup */
     if (!unsafe) {
         bdrv_delete(bs_old_backing);
@@ -1240,7 +1363,9 @@
     }
 
     bdrv_delete(bs);
-
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
@@ -1306,6 +1431,9 @@
     free_option_parameters(param);
 
     bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
+    if (!bs) {
+        return 1;
+    }
 
     if (relative) {
         total_size = bdrv_getlength(bs) + n * relative;
@@ -1314,6 +1442,8 @@
     }
     if (total_size <= 0) {
         error("New image size must be positive");
+        ret = -1;
+        goto out;
     }
 
     ret = bdrv_truncate(bs, total_size);
@@ -1331,8 +1461,11 @@
         error("Error resizing image (%d)", -ret);
         break;
     }
-
+out:
     bdrv_delete(bs);
+    if (ret) {
+        return 1;
+    }
     return 0;
 }
 
diff --git a/qemu-option.c b/qemu-option.c
index 7f70d0f..30327d4 100644
--- a/qemu-option.c
+++ b/qemu-option.c
@@ -719,6 +719,15 @@
     return opts;
 }
 
+void qemu_opts_reset(QemuOptsList *list)
+{
+    QemuOpts *opts, *next_opts;
+
+    QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
+        qemu_opts_del(opts);
+    }
+}
+
 int qemu_opts_set(QemuOptsList *list, const char *id,
                   const char *name, const char *value)
 {
diff --git a/qemu-option.h b/qemu-option.h
index 4823219..9e2406c 100644
--- a/qemu-option.h
+++ b/qemu-option.h
@@ -115,6 +115,7 @@
 
 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id);
 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists);
+void qemu_opts_reset(QemuOptsList *list);
 int qemu_opts_set(QemuOptsList *list, const char *id,
                   const char *name, const char *value);
 const char *qemu_opts_id(QemuOpts *opts);
diff --git a/savevm.c b/savevm.c
index 20354a8..f1f450e 100644
--- a/savevm.c
+++ b/savevm.c
@@ -83,9 +83,6 @@
 #include "qemu_socket.h"
 #include "qemu-queue.h"
 
-/* point to the block driver where the snapshots are managed */
-static BlockDriverState *bs_snapshots;
-
 #define SELF_ANNOUNCE_ROUNDS 5
 
 #ifndef ETH_P_RARP
@@ -1575,26 +1572,6 @@
     return ret;
 }
 
-static BlockDriverState *get_bs_snapshots(void)
-{
-    BlockDriverState *bs;
-
-    if (bs_snapshots)
-        return bs_snapshots;
-    /* FIXME what if bs_snapshots gets hot-unplugged? */
-
-    bs = NULL;
-    while ((bs = bdrv_next(bs))) {
-        if (bdrv_can_snapshot(bs)) {
-            goto ok;
-        }
-    }
-    return NULL;
- ok:
-    bs_snapshots = bs;
-    return bs;
-}
-
 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
                               const char *name)
 {
@@ -1674,7 +1651,7 @@
         }
     }
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No block device can accept snapshots\n");
         return;
@@ -1769,7 +1746,7 @@
         }
     }
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         error_report("No block device supports snapshots");
         return -EINVAL;
@@ -1833,7 +1810,7 @@
     int ret;
     const char *name = qdict_get_str(qdict, "name");
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No block device supports snapshots\n");
         return;
@@ -1863,7 +1840,7 @@
     int nb_sns, i;
     char buf[256];
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No available block device supports snapshots\n");
         return;