[Qemu-devel] [PATCH] block/vpc: fix virtual size for images created with disk2vhd

[Peter Lieven <pl@kamp.de>]

Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block/vpc.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/block/vpc.c b/block/vpc.c
index b5dca39..1acc1d4 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -211,6 +211,15 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
     bs->total_sectors = (int64_t)
         be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
 
+    /* images created with disk2vhd report a far higher virtual size
+     * than expected with the cyls * heads * sectors_per_cyl formula.
+     * use the footer->size instead if the image was created with
+     * disk2vhd.
+     */
+    if (!strncmp(footer->creator_app, "d2v", 4)) {
+        bs->total_sectors = be64_to_cpu(footer->size) / BDRV_SECTOR_SIZE;
+    }
+
     /* Allow a maximum disk size of approximately 2 TB */
     if (bs->total_sectors >= 65535LL * 255 * 255) {
         ret = -EFBIG;
-- 
1.7.9.5