From a08f0c3b5fe8d2e08c3b7e797b359772819fbb92 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 8 Mar 2016 15:57:05 +0100
Subject: [PATCH] vdi: 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/vdi.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/block/vdi.c b/block/vdi.c
index 12407c43e9..662d14b74e 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -52,6 +52,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "block/block_int.h"
+#include "sysemu/block-backend.h"
 #include "qemu/module.h"
 #include "migration/migration.h"
 #include "qemu/coroutine.h"
@@ -733,7 +734,7 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
     size_t bmap_size;
     int64_t offset = 0;
     Error *local_err = NULL;
-    BlockDriverState *bs = NULL;
+    BlockBackend *blk = NULL;
     uint32_t *bmap = NULL;
 
     logout("\n");
@@ -766,14 +767,18 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
         error_propagate(errp, local_err);
         goto exit;
     }
-    ret = bdrv_open(&bs, filename, NULL, NULL,
-                    BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
-                    &local_err);
-    if (ret < 0) {
+
+    blk = blk_new_open("image", filename, NULL, NULL,
+                       BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
+                       &local_err);
+    if (blk == NULL) {
         error_propagate(errp, local_err);
+        ret = -EIO;
         goto exit;
     }
 
+    blk_set_allow_write_beyond_eof(blk, true);
+
     /* We need enough blocks to store the given disk size,
        so always round up. */
     blocks = DIV_ROUND_UP(bytes, block_size);
@@ -803,7 +808,7 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
     vdi_header_print(&header);
 #endif
     vdi_header_to_le(&header);
-    ret = bdrv_pwrite_sync(bs, offset, &header, sizeof(header));
+    ret = blk_pwrite(blk, offset, &header, sizeof(header));
     if (ret < 0) {
         error_setg(errp, "Error writing header to %s", filename);
         goto exit;
@@ -824,7 +829,7 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
                 bmap[i] = VDI_UNALLOCATED;
             }
         }
-        ret = bdrv_pwrite_sync(bs, offset, bmap, bmap_size);
+        ret = blk_pwrite(blk, offset, bmap, bmap_size);
         if (ret < 0) {
             error_setg(errp, "Error writing bmap to %s", filename);
             goto exit;
@@ -833,7 +838,7 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
     }
 
     if (image_type == VDI_TYPE_STATIC) {
-        ret = bdrv_truncate(bs, offset + blocks * block_size);
+        ret = blk_truncate(blk, offset + blocks * block_size);
         if (ret < 0) {
             error_setg(errp, "Failed to statically allocate %s", filename);
             goto exit;
@@ -841,7 +846,7 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
     }
 
 exit:
-    bdrv_unref(bs);
+    blk_unref(blk);
     g_free(bmap);
     return ret;
 }