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[PATCH v5 03/12] nbd: Utilize QAPI_CLONE for type conversion
From: |
Eric Blake |
Subject: |
[PATCH v5 03/12] nbd: Utilize QAPI_CLONE for type conversion |
Date: |
Fri, 23 Oct 2020 13:36:43 -0500 |
Rather than open-coding the translation from the deprecated
NbdServerAddOptions type to the preferred BlockExportOptionsNbd, it's
better to utilize QAPI_CLONE_MEMBERS. This solves a couple of issues:
first, if we do any more refactoring of the base type (which an
upcoming patch plans to do), we don't have to revisit the open-coding.
Second, our assignment to arg->name is fishy: the generated QAPI code
currently does not visit it if arg->has_name is false, but if it DID
visit it, we would have introduced a double-free situation when arg is
finally freed.
Signed-off-by: Eric Blake <eblake@redhat.com>
---
blockdev-nbd.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 8174023e5c47..cee9134b12eb 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -14,6 +14,8 @@
#include "sysemu/block-backend.h"
#include "hw/block/block.h"
#include "qapi/error.h"
+#include "qapi/clone-visitor.h"
+#include "qapi/qapi-visit-block-export.h"
#include "qapi/qapi-commands-block-export.h"
#include "block/nbd.h"
#include "io/channel-socket.h"
@@ -195,7 +197,8 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error
**errp)
* the device name as a default here for compatibility.
*/
if (!arg->has_name) {
- arg->name = arg->device;
+ arg->has_name = true;
+ arg->name = g_strdup(arg->device);
}
export_opts = g_new(BlockExportOptions, 1);
@@ -205,15 +208,9 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error
**errp)
.node_name = g_strdup(bdrv_get_node_name(bs)),
.has_writable = arg->has_writable,
.writable = arg->writable,
- .u.nbd = {
- .has_name = true,
- .name = g_strdup(arg->name),
- .has_description = arg->has_description,
- .description = g_strdup(arg->description),
- .has_bitmap = arg->has_bitmap,
- .bitmap = g_strdup(arg->bitmap),
- },
};
+ QAPI_CLONE_MEMBERS(BlockExportOptionsNbd, &export_opts->u.nbd,
+ qapi_NbdServerAddOptions_base(arg));
/*
* nbd-server-add doesn't complain when a read-only device should be
--
2.29.0
- [PATCH v5 00/12] Exposing backing-chain allocation over NBD, Eric Blake, 2020/10/23
- [PATCH v5 03/12] nbd: Utilize QAPI_CLONE for type conversion,
Eric Blake <=
- [PATCH v5 04/12] nbd: Add new qemu:allocation-depth metadata context, Eric Blake, 2020/10/23
- [PATCH v5 05/12] nbd: Add 'qemu-nbd -A' to expose allocation depth, Eric Blake, 2020/10/23
- [PATCH v5 06/12] nbd: Update qapi to support exporting multiple bitmaps, Eric Blake, 2020/10/23
- [PATCH v5 07/12] nbd: Simplify qemu bitmap context name, Eric Blake, 2020/10/23
- [PATCH v5 08/12] nbd: Refactor counting of metadata contexts, Eric Blake, 2020/10/23
- [PATCH v5 09/12] nbd: Allow export of multiple bitmaps for one device, Eric Blake, 2020/10/23