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qapi: add name parameter to nbd-server-add

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Allow user to specify name for new export, to not reuse internal
node name and to not show it to clients.

This also allows creating several exports per device.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180119135719.24745-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-01-19 16:57:15 +03:00 committed by Eric Blake
parent e607bbee55
commit 902a1f94be
3 changed files with 19 additions and 9 deletions
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14
blockdev-nbd.c
View file

@ -140,8 +140,8 @@ void qmp_nbd_server_start(SocketAddressLegacy *addr,
qapi_free_SocketAddress(addr_flat);
}
void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
Error **errp)
void qmp_nbd_server_add(const char *device, bool has_name, const char *name,
bool has_writable, bool writable, Error **errp)
{
BlockDriverState *bs = NULL;
BlockBackend *on_eject_blk;
@ -152,8 +152,12 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
return;
}
if (nbd_export_find(device)) {
error_setg(errp, "NBD server already exporting device '%s'", device);
if (!has_name) {
name = device;
}
if (nbd_export_find(name)) {
error_setg(errp, "NBD server already has export named '%s'", name);
return;
}
@ -177,7 +181,7 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
return;
}
nbd_export_set_name(exp, device);
nbd_export_set_name(exp, name);
/* The list of named exports has a strong reference to this export now and
* our only way of accessing it is through nbd_export_find(), so we can drop

5
hmp.c
View file

@ -2203,7 +2203,8 @@ void hmp_nbd_server_start(Monitor *mon, const QDict *qdict)
continue;
}
qmp_nbd_server_add(info->value->device, true, writable, &local_err);
qmp_nbd_server_add(info->value->device, false, NULL,
true, writable, &local_err);
if (local_err != NULL) {
qmp_nbd_server_stop(NULL);
@ -2223,7 +2224,7 @@ void hmp_nbd_server_add(Monitor *mon, const QDict *qdict)
bool writable = qdict_get_try_bool(qdict, "writable", false);
Error *local_err = NULL;
qmp_nbd_server_add(device, true, writable, &local_err);
qmp_nbd_server_add(device, false, NULL, true, writable, &local_err);
if (local_err != NULL) {
hmp_handle_error(mon, &local_err);

9
qapi/block.json
View file

@ -213,14 +213,19 @@
#
# @device: The device name or node name of the node to be exported
#
# @name: Export name. If unspecified, the @device parameter is used as the
# export name. (Since 2.12)
#
# @writable: Whether clients should be able to write to the device via the
# NBD connection (default false).
#
# Returns: error if the device is already marked for export.
# Returns: error if the server is not running, or export with the same name
# already exists.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-add', 'data': {'device': 'str', '*writable': 'bool'} }
{ 'command': 'nbd-server-add',
'data': {'device': 'str', '*name': 'str', '*writable': 'bool'} }
##
# @nbd-server-stop: