If you open an image temporarily just because you want to check its size
or get it flushed, there's no real reason to open the whole backing file
chain.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
block.c | 3 ++-
block/qcow2.c | 3 ++-
block/vmdk.c | 2 +-
3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/block.c b/block.c
index 03e45fc..e2745a5 100644
--- a/block.c
+++ b/block.c
@@ -1061,7 +1061,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename,
QDict *options,
/* Get the required size from the image */
bs1 = bdrv_new("");
QINCREF(options);
- ret = bdrv_open(bs1, filename, options, 0, drv, &local_err);
+ ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING,
+ drv, &local_err);
if (ret < 0) {
bdrv_unref(bs1);
goto fail;
diff --git a/block/qcow2.c b/block/qcow2.c
index 2fe37ed..8e2b6c7 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1588,7 +1588,8 @@ static int qcow2_create2(const char *filename, int64_t
total_size,
/* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */
ret = bdrv_open(bs, filename, NULL,
- BDRV_O_RDWR | BDRV_O_CACHE_WB, drv, &local_err);
+ BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
+ drv, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto out;
diff --git a/block/vmdk.c b/block/vmdk.c
index 6555663..5fb6c81 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1690,7 +1690,7 @@ static int vmdk_create(const char *filename,
QEMUOptionParameter *options,
}
if (backing_file) {
BlockDriverState *bs = bdrv_new("");
- ret = bdrv_open(bs, backing_file, NULL, 0, NULL, errp);
+ ret = bdrv_open(bs, backing_file, NULL, BDRV_O_NO_BACKING, NULL, errp);
if (ret != 0) {
bdrv_unref(bs);
return ret;
--
1.8.1.4
