parallels: Use BB functions in .bdrv_create()

All users of the block layers are supposed to go through a BlockBackend.
The .bdrv_create() implementation is one such user, so this patch
converts it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/parallels.c

@@ -30,6 +30,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "block/block_int.h"
+#include "sysemu/block-backend.h"
 #include "qemu/module.h"
 #include "qemu/bitmap.h"
 #include "qapi/util.h"
@@ -461,7 +462,7 @@ static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
     int64_t total_size, cl_size;
     uint8_t tmp[BDRV_SECTOR_SIZE];
     Error *local_err = NULL;
-    BlockDriverState *file;
+    BlockBackend *file;
     uint32_t bat_entries, bat_sectors;
     ParallelsHeader header;
     int ret;
@@ -477,15 +478,17 @@ static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
         return ret;
     }
 
-    file = NULL;
-    ret = bdrv_open(&file, filename, NULL, NULL,
-                    BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
-                    &local_err);
-    if (ret < 0) {
+    file = blk_new_open("image", filename, NULL, NULL,
+                        BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
+                        &local_err);
+    if (file == NULL) {
         error_propagate(errp, local_err);
-        return ret;
+        return -EIO;
     }
-    ret = bdrv_truncate(file, 0);
+
+    blk_set_allow_write_beyond_eof(file, true);
+
+    ret = blk_truncate(file, 0);
     if (ret < 0) {
         goto exit;
     }
@@ -509,18 +512,18 @@ static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
     memset(tmp, 0, sizeof(tmp));
     memcpy(tmp, &header, sizeof(header));
 
-    ret = bdrv_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE);
+    ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE);
     if (ret < 0) {
         goto exit;
     }
-    ret = bdrv_write_zeroes(file, 1, bat_sectors - 1, 0);
+    ret = blk_write_zeroes(file, 1, bat_sectors - 1, 0);
     if (ret < 0) {
         goto exit;
     }
     ret = 0;
 
 done:
-    bdrv_unref(file);
+    blk_unref(file);
     return ret;
 
 exit: