diff --git a/block.c b/block.c
index 02f4258..31610af 100644
--- a/block.c
+++ b/block.c
@@ -338,7 +338,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
     int ret;
 
     bs = bdrv_new("");
-    ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
+    ret = bdrv_open(bs, filename, flags | BDRV_O_FILE, NULL);
     if (ret < 0) {
         bdrv_delete(bs);
         return ret;
@@ -348,13 +348,8 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
     return 0;
 }
 
-int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
-{
-    return bdrv_open2(bs, filename, flags, NULL);
-}
-
-int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
-               BlockDriver *drv)
+int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
+              BlockDriver *drv)
 {
     int ret, open_flags;
     char tmp_filename[PATH_MAX];
@@ -379,7 +374,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
 
         /* if there is a backing file, use it */
         bs1 = bdrv_new("");
-        ret = bdrv_open2(bs1, filename, 0, drv);
+        ret = bdrv_open(bs1, filename, 0, drv);
         if (ret < 0) {
             bdrv_delete(bs1);
             return ret;
@@ -491,9 +486,8 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
 
         /* backing files always opened read-only */
         open_flags &= ~BDRV_O_RDWR;
-        
-        ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
-                         back_drv);
+
+        ret = bdrv_open(bs->backing_hd, backing_filename, open_flags, back_drv);
         if (ret < 0) {
             bdrv_close(bs);
             return ret;
@@ -605,12 +599,12 @@ int bdrv_commit(BlockDriverState *bs)
         bdrv_delete(bs->backing_hd);
         bs->backing_hd = NULL;
         bs_rw = bdrv_new("");
-        rw_ret = bdrv_open2(bs_rw, filename, open_flags | BDRV_O_RDWR, NULL);
+        rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, NULL);
         if (rw_ret < 0) {
             bdrv_delete(bs_rw);
             /* try to re-open read-only */
             bs_ro = bdrv_new("");
-            ret = bdrv_open2(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL);
+            ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL);
             if (ret < 0) {
                 bdrv_delete(bs_ro);
                 /* drive not functional anymore */
@@ -662,7 +656,7 @@ ro_cleanup:
         bdrv_delete(bs->backing_hd);
         bs->backing_hd = NULL;
         bs_ro = bdrv_new("");
-        ret = bdrv_open2(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL);
+        ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL);
         if (ret < 0) {
             bdrv_delete(bs_ro);
             /* drive not functional anymore */
diff --git a/block.h b/block.h
index edf5704..8fca466 100644
--- a/block.h
+++ b/block.h
@@ -68,9 +68,8 @@ int bdrv_create2(BlockDriver *drv,
 BlockDriverState *bdrv_new(const char *device_name);
 void bdrv_delete(BlockDriverState *bs);
 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
-int bdrv_open(BlockDriverState *bs, const char *filename, int flags);
-int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
-               BlockDriver *drv);
+int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
+              BlockDriver *drv);
 void bdrv_close(BlockDriverState *bs);
 int bdrv_check(BlockDriverState *bs);
 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
diff --git a/block/qcow2.c b/block/qcow2.c
index aca8844..4efe1ad 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -52,7 +52,7 @@ typedef struct {
 #define  QCOW_EXT_MAGIC_END 0
 #define  QCOW_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
 
-
+static BlockDriver bdrv_qcow2;
 
 static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
 {
@@ -1020,7 +1020,7 @@ exit:
     if (ret == 0 && prealloc) {
         BlockDriverState *bs;
         bs = bdrv_new("");
-        bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR);
+        bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR, &bdrv_qcow2);
         preallocate(bs);
         bdrv_close(bs);
     }
diff --git a/block/vmdk.c b/block/vmdk.c
index 007fca4..6fdea1d 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -390,7 +390,7 @@ static int vmdk_parent_open(BlockDriverState *bs, const char * filename)
             return -1;
         }
         parent_open = 1;
-        if (bdrv_open(bs->backing_hd, parent_img_name, 0) < 0)
+        if (bdrv_open(bs->backing_hd, parent_img_name, 0, NULL) < 0)
             goto failure;
         parent_open = 0;
     }
diff --git a/block/vvfat.c b/block/vvfat.c
index 36f6ab4..0701df4 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2795,8 +2795,11 @@ static int enable_write_target(BDRVVVFATState *s)
     if (bdrv_create(bdrv_qcow, s->qcow_filename, options) < 0)
 	return -1;
     s->qcow = bdrv_new("");
-    if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, BDRV_O_RDWR) < 0)
+    if (s->qcow == NULL ||
+        bdrv_open(s->qcow, s->qcow_filename, BDRV_O_RDWR, bdrv_qcow) < 0)
+    {
 	return -1;
+    }
 
 #ifndef _WIN32
     unlink(s->qcow_filename);
diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index beadf90..95017a1 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -629,7 +629,7 @@ static int blk_init(struct XenDevice *xendev)
         xen_be_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n");
 	blkdev->bs = bdrv_new(blkdev->dev);
 	if (blkdev->bs) {
-	    if (bdrv_open2(blkdev->bs, blkdev->filename, qflags,
+	    if (bdrv_open(blkdev->bs, blkdev->filename, qflags,
                            bdrv_find_whitelisted_format(blkdev->fileproto))
                 != 0) {
 		bdrv_delete(blkdev->bs);
diff --git a/monitor.c b/monitor.c
index 822dc27..a8ecea1 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1096,7 +1096,7 @@ static int do_change_block(Monitor *mon, const char *device,
     if (eject_device(mon, bs, 0) < 0) {
         return -1;
     }
-    if (bdrv_open2(bs, filename, BDRV_O_RDWR, drv) < 0) {
+    if (bdrv_open(bs, filename, BDRV_O_RDWR, drv) < 0) {
         return -1;
     }
     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
diff --git a/qemu-img.c b/qemu-img.c
index 66c8353..8c4f554 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -210,7 +210,7 @@ static BlockDriverState *bdrv_new_open(const char *filename,
     if (!readonly) {
         flags |= BDRV_O_RDWR;
     }
-    if (bdrv_open2(bs, filename, flags, drv) < 0) {
+    if (bdrv_open(bs, filename, flags, drv) < 0) {
         error("Could not open '%s'", filename);
     }
     if (bdrv_is_encrypted(bs)) {
@@ -415,7 +415,7 @@ static int img_check(int argc, char **argv)
     } else {
         drv = NULL;
     }
-    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
+    if (bdrv_open(bs, filename, BRDV_O_FLAGS, drv) < 0) {
         error("Could not open '%s'", filename);
     }
     ret = bdrv_check(bs);
@@ -474,7 +474,7 @@ static int img_commit(int argc, char **argv)
     } else {
         drv = NULL;
     }
-    if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) {
+    if (bdrv_open(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) {
         error("Could not open '%s'", filename);
     }
     ret = bdrv_commit(bs);
@@ -927,7 +927,7 @@ static int img_info(int argc, char **argv)
     } else {
         drv = NULL;
     }
-    if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_NO_BACKING, drv) < 0) {
+    if (bdrv_open(bs, filename, BRDV_O_FLAGS | BDRV_O_NO_BACKING, drv) < 0) {
         error("Could not open '%s'", filename);
     }
     bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
@@ -1033,7 +1033,7 @@ static int img_snapshot(int argc, char **argv)
     if (!bs)
         error("Not enough memory");
 
-    if (bdrv_open2(bs, filename, bdrv_oflags, NULL) < 0) {
+    if (bdrv_open(bs, filename, bdrv_oflags, NULL) < 0) {
         error("Could not open '%s'", filename);
     }
 
@@ -1138,7 +1138,7 @@ static int img_rebase(int argc, char **argv)
     }
 
     flags = BRDV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
-    if (bdrv_open2(bs, filename, flags, drv) < 0) {
+    if (bdrv_open(bs, filename, flags, drv) < 0) {
         error("Could not open '%s'", filename);
     }
 
@@ -1170,7 +1170,7 @@ static int img_rebase(int argc, char **argv)
 
         bs_old_backing = bdrv_new("old_backing");
         bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
-        if (bdrv_open2(bs_old_backing, backing_name, BRDV_O_FLAGS,
+        if (bdrv_open(bs_old_backing, backing_name, BRDV_O_FLAGS,
             old_backing_drv))
         {
             error("Could not open old backing file '%s'", backing_name);
@@ -1178,7 +1178,7 @@ static int img_rebase(int argc, char **argv)
         }
 
         bs_new_backing = bdrv_new("new_backing");
-        if (bdrv_open2(bs_new_backing, out_baseimg, BRDV_O_FLAGS | BDRV_O_RDWR,
+        if (bdrv_open(bs_new_backing, out_baseimg, BRDV_O_FLAGS | BDRV_O_RDWR,
             new_backing_drv))
         {
             error("Could not open new backing file '%s'", out_baseimg);
diff --git a/qemu-io.c b/qemu-io.c
index 6b83714..ffb5817 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -1284,7 +1284,7 @@ static int openfile(char *name, int flags, int growable)
 		flags |= BDRV_O_FILE;
 	}
 
-	if (bdrv_open(bs, name, flags) < 0) {
+	if (bdrv_open(bs, name, flags, NULL) < 0) {
 		fprintf(stderr, "%s: can't open device %s\n", progname, name);
 		bs = NULL;
 		return 1;
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 6d854d3..25aa913 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -333,7 +333,7 @@ int main(int argc, char **argv)
     if (bs == NULL)
         return 1;
 
-    if (bdrv_open(bs, argv[optind], flags) < 0)
+    if (bdrv_open(bs, argv[optind], flags, NULL) < 0)
         return 1;
 
     fd_size = bs->total_sectors * 512;
diff --git a/vl.c b/vl.c
index 6768cf1..a66a5eb 100644
--- a/vl.c
+++ b/vl.c
@@ -1200,7 +1200,7 @@ DriveInfo *drive_init(QemuOpts *opts, void *opaque,
     }
     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 
-    if (bdrv_open2(dinfo->bdrv, file, bdrv_flags, drv) < 0) {
+    if (bdrv_open(dinfo->bdrv, file, bdrv_flags, drv) < 0) {
         fprintf(stderr, "qemu: could not open disk image %s: %s\n",
                         file, strerror(errno));
         return NULL;
