2 * Serving QEMU block devices via NBD
4 * Copyright (c) 2012 Red Hat, Inc.
6 * Author: Paolo Bonzini <pbonzini@redhat.com>
8 * This work is licensed under the terms of the GNU GPL, version 2 or
9 * later. See the COPYING file in the top-level directory.
12 #include "qemu/osdep.h"
13 #include "sysemu/blockdev.h"
14 #include "sysemu/block-backend.h"
15 #include "hw/block/block.h"
16 #include "qapi/error.h"
17 #include "qapi/qapi-commands-block.h"
18 #include "sysemu/sysemu.h"
19 #include "block/nbd.h"
20 #include "io/channel-socket.h"
21 #include "io/net-listener.h"
23 typedef struct NBDServerData
{
24 QIONetListener
*listener
;
25 QCryptoTLSCreds
*tlscreds
;
28 static NBDServerData
*nbd_server
;
30 static void nbd_blockdev_client_closed(NBDClient
*client
, bool ignored
)
32 nbd_client_put(client
);
35 static void nbd_accept(QIONetListener
*listener
, QIOChannelSocket
*cioc
,
38 qio_channel_set_name(QIO_CHANNEL(cioc
), "nbd-server");
39 nbd_client_new(cioc
, nbd_server
->tlscreds
, NULL
,
40 nbd_blockdev_client_closed
);
44 static void nbd_server_free(NBDServerData
*server
)
50 qio_net_listener_disconnect(server
->listener
);
51 object_unref(OBJECT(server
->listener
));
52 if (server
->tlscreds
) {
53 object_unref(OBJECT(server
->tlscreds
));
59 static QCryptoTLSCreds
*nbd_get_tls_creds(const char *id
, Error
**errp
)
62 QCryptoTLSCreds
*creds
;
64 obj
= object_resolve_path_component(
65 object_get_objects_root(), id
);
67 error_setg(errp
, "No TLS credentials with id '%s'",
71 creds
= (QCryptoTLSCreds
*)
72 object_dynamic_cast(obj
, TYPE_QCRYPTO_TLS_CREDS
);
74 error_setg(errp
, "Object with id '%s' is not TLS credentials",
79 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_SERVER
) {
81 "Expecting TLS credentials with a server endpoint");
89 void nbd_server_start(SocketAddress
*addr
, const char *tls_creds
,
93 error_setg(errp
, "NBD server already running");
97 nbd_server
= g_new0(NBDServerData
, 1);
98 nbd_server
->listener
= qio_net_listener_new();
100 qio_net_listener_set_name(nbd_server
->listener
,
103 if (qio_net_listener_open_sync(nbd_server
->listener
, addr
, errp
) < 0) {
108 nbd_server
->tlscreds
= nbd_get_tls_creds(tls_creds
, errp
);
109 if (!nbd_server
->tlscreds
) {
113 /* TODO SOCKET_ADDRESS_TYPE_FD where fd has AF_INET or AF_INET6 */
114 if (addr
->type
!= SOCKET_ADDRESS_TYPE_INET
) {
115 error_setg(errp
, "TLS is only supported with IPv4/IPv6");
120 qio_net_listener_set_client_func(nbd_server
->listener
,
128 nbd_server_free(nbd_server
);
132 void qmp_nbd_server_start(SocketAddressLegacy
*addr
,
133 bool has_tls_creds
, const char *tls_creds
,
136 SocketAddress
*addr_flat
= socket_address_flatten(addr
);
138 nbd_server_start(addr_flat
, tls_creds
, errp
);
139 qapi_free_SocketAddress(addr_flat
);
142 void qmp_nbd_server_add(const char *device
, bool has_name
, const char *name
,
143 bool has_writable
, bool writable
, Error
**errp
)
145 BlockDriverState
*bs
= NULL
;
146 BlockBackend
*on_eject_blk
;
150 error_setg(errp
, "NBD server not running");
158 if (nbd_export_find(name
)) {
159 error_setg(errp
, "NBD server already has export named '%s'", name
);
163 on_eject_blk
= blk_by_name(device
);
165 bs
= bdrv_lookup_bs(device
, device
, errp
);
173 if (bdrv_is_read_only(bs
)) {
177 exp
= nbd_export_new(bs
, 0, -1, writable
? 0 : NBD_FLAG_READ_ONLY
,
178 NULL
, false, on_eject_blk
, errp
);
183 nbd_export_set_name(exp
, name
);
185 /* The list of named exports has a strong reference to this export now and
186 * our only way of accessing it is through nbd_export_find(), so we can drop
187 * the strong reference that is @exp. */
191 void qmp_nbd_server_remove(const char *name
,
192 bool has_mode
, NbdServerRemoveMode mode
,
198 error_setg(errp
, "NBD server not running");
202 exp
= nbd_export_find(name
);
204 error_setg(errp
, "Export '%s' is not found", name
);
209 mode
= NBD_SERVER_REMOVE_MODE_SAFE
;
212 nbd_export_remove(exp
, mode
, errp
);
215 void qmp_nbd_server_stop(Error
**errp
)
217 nbd_export_close_all();
219 nbd_server_free(nbd_server
);
223 void qmp_x_nbd_server_add_bitmap(const char *name
, const char *bitmap
,
224 bool has_bitmap_export_name
,
225 const char *bitmap_export_name
,
231 error_setg(errp
, "NBD server not running");
235 exp
= nbd_export_find(name
);
237 error_setg(errp
, "Export '%s' is not found", name
);
241 nbd_export_bitmap(exp
, bitmap
,
242 has_bitmap_export_name
? bitmap_export_name
: bitmap
,