block: x-blockdev-create QMP command

This adds a synchronous x-blockdev-create QMP command that can create
qcow2 images on a given node name.

We don't want to block while creating an image, so this is not the final
interface in all aspects, but BlockdevCreateOptionsQcow2 and
.bdrv_co_create() are what they actually might look like in the end. In
any case, this should be good enough to test whether we interpret
BlockdevCreateOptions as we should.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/block/create.c b/block/create.c
new file mode 100644
index 0000000000..8bd8a03719
--- /dev/null
+++ b/block/create.c
@@ -0,0 +1,76 @@
+/*
+ * Block layer code related to image creation
+ *
+ * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "block/block_int.h"
+#include "qapi/qapi-commands-block-core.h"
+#include "qapi/error.h"
+
+typedef struct BlockdevCreateCo {
+    BlockDriver *drv;
+    BlockdevCreateOptions *opts;
+    int ret;
+    Error **errp;
+} BlockdevCreateCo;
+
+static void coroutine_fn bdrv_co_create_co_entry(void *opaque)
+{
+    BlockdevCreateCo *cco = opaque;
+    cco->ret = cco->drv->bdrv_co_create(cco->opts, cco->errp);
+}
+
+void qmp_x_blockdev_create(BlockdevCreateOptions *options, Error **errp)
+{
+    const char *fmt = BlockdevDriver_str(options->driver);
+    BlockDriver *drv = bdrv_find_format(fmt);
+    Coroutine *co;
+    BlockdevCreateCo cco;
+
+    /* If the driver is in the schema, we know that it exists. But it may not
+     * be whitelisted. */
+    assert(drv);
+    if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
+        error_setg(errp, "Driver is not whitelisted");
+        return;
+    }
+
+    /* Call callback if it exists */
+    if (!drv->bdrv_co_create) {
+        error_setg(errp, "Driver does not support blockdev-create");
+        return;
+    }
+
+    cco = (BlockdevCreateCo) {
+        .drv = drv,
+        .opts = options,
+        .ret = -EINPROGRESS,
+        .errp = errp,
+    };
+
+    co = qemu_coroutine_create(bdrv_co_create_co_entry, &cco);
+    qemu_coroutine_enter(co);
+    while (cco.ret == -EINPROGRESS) {
+        aio_poll(qemu_get_aio_context(), true);
+    }
+}