[Qemu-devel] [PULL 06/17] block: Use bdrv_has_zero_init_truncate()

[Max Reitz <mreitz@redhat.com>]

vhdx and parallels call bdrv_has_zero_init() when they do not really
care about an image's post-create state but only about what happens when
you grow an image.  That is a bit ugly, and also overly safe when
growing preallocated images without preallocating the new areas.

Let them use bdrv_has_zero_init_truncate() instead.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190724171239.8764-6-mreitz@redhat.com
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
[mreitz: Added commit message]
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/parallels.c | 2 +-
 block/vhdx.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 00fae125d1..7cd2714b69 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -835,7 +835,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail_options;
     }
 
-    if (!bdrv_has_zero_init(bs->file->bs)) {
+    if (!bdrv_has_zero_init_truncate(bs->file->bs)) {
         s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
     }
 
diff --git a/block/vhdx.c b/block/vhdx.c
index d6070b6fa8..a02d1c99a7 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1282,7 +1282,7 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
                 /* Queue another write of zero buffers if the underlying file
                  * does not zero-fill on file extension */
 
-                if (bdrv_has_zero_init(bs->file->bs) == 0) {
+                if (bdrv_has_zero_init_truncate(bs->file->bs) == 0) {
                     use_zero_buffers = true;
 
                     /* zero fill the front, if any */
-- 
2.21.0