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Diffstat (limited to 'block.c')
-rw-r--r--block.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/block.c b/block.c
index f96d26b795..1368cf5409 100644
--- a/block.c
+++ b/block.c
@@ -939,13 +939,16 @@ static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv,
}
bs->drv = drv;
+ bs->read_only = !(bs->open_flags & BDRV_O_RDWR);
bs->opaque = g_malloc0(drv->instance_size);
if (drv->bdrv_file_open) {
assert(!drv->bdrv_needs_filename || bs->filename[0]);
ret = drv->bdrv_file_open(bs, options, open_flags, &local_err);
- } else {
+ } else if (drv->bdrv_open) {
ret = drv->bdrv_open(bs, options, open_flags, &local_err);
+ } else {
+ ret = 0;
}
if (ret < 0) {
@@ -986,6 +989,31 @@ free_and_fail:
return ret;
}
+BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name,
+ int flags, Error **errp)
+{
+ BlockDriverState *bs;
+ int ret;
+
+ bs = bdrv_new();
+ bs->open_flags = flags;
+ bs->explicit_options = qdict_new();
+ bs->options = qdict_new();
+ bs->opaque = NULL;
+
+ update_options_from_flags(bs->options, flags);
+
+ ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp);
+ if (ret < 0) {
+ QDECREF(bs->explicit_options);
+ QDECREF(bs->options);
+ bdrv_unref(bs);
+ return NULL;
+ }
+
+ return bs;
+}
+
QemuOptsList bdrv_runtime_opts = {
.name = "bdrv_common",
.head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head),