spapr: Get rid of cas_check_pvr() error reporting
[qemu/ar7.git] / blockdev-nbd.c
blob8174023e5c4741d588d7be1153b751ccdc19d4fd
1 /*
2  * Serving QEMU block devices via NBD
3  *
4  * Copyright (c) 2012 Red Hat, Inc.
5  *
6  * Author: Paolo Bonzini <pbonzini@redhat.com>
7  *
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.
10  */
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-export.h"
18 #include "block/nbd.h"
19 #include "io/channel-socket.h"
20 #include "io/net-listener.h"
22 typedef struct NBDServerData {
23     QIONetListener *listener;
24     QCryptoTLSCreds *tlscreds;
25     char *tlsauthz;
26     uint32_t max_connections;
27     uint32_t connections;
28 } NBDServerData;
30 static NBDServerData *nbd_server;
31 static bool is_qemu_nbd;
33 static void nbd_update_server_watch(NBDServerData *s);
35 void nbd_server_is_qemu_nbd(bool value)
37     is_qemu_nbd = value;
40 bool nbd_server_is_running(void)
42     return nbd_server || is_qemu_nbd;
45 static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
47     nbd_client_put(client);
48     assert(nbd_server->connections > 0);
49     nbd_server->connections--;
50     nbd_update_server_watch(nbd_server);
53 static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
54                        gpointer opaque)
56     nbd_server->connections++;
57     nbd_update_server_watch(nbd_server);
59     qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
60     nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz,
61                    nbd_blockdev_client_closed);
64 static void nbd_update_server_watch(NBDServerData *s)
66     if (!s->max_connections || s->connections < s->max_connections) {
67         qio_net_listener_set_client_func(s->listener, nbd_accept, NULL, NULL);
68     } else {
69         qio_net_listener_set_client_func(s->listener, NULL, NULL, NULL);
70     }
73 static void nbd_server_free(NBDServerData *server)
75     if (!server) {
76         return;
77     }
79     qio_net_listener_disconnect(server->listener);
80     object_unref(OBJECT(server->listener));
81     if (server->tlscreds) {
82         object_unref(OBJECT(server->tlscreds));
83     }
84     g_free(server->tlsauthz);
86     g_free(server);
89 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
91     Object *obj;
92     QCryptoTLSCreds *creds;
94     obj = object_resolve_path_component(
95         object_get_objects_root(), id);
96     if (!obj) {
97         error_setg(errp, "No TLS credentials with id '%s'",
98                    id);
99         return NULL;
100     }
101     creds = (QCryptoTLSCreds *)
102         object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
103     if (!creds) {
104         error_setg(errp, "Object with id '%s' is not TLS credentials",
105                    id);
106         return NULL;
107     }
109     if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
110         error_setg(errp,
111                    "Expecting TLS credentials with a server endpoint");
112         return NULL;
113     }
114     object_ref(obj);
115     return creds;
119 void nbd_server_start(SocketAddress *addr, const char *tls_creds,
120                       const char *tls_authz, uint32_t max_connections,
121                       Error **errp)
123     if (nbd_server) {
124         error_setg(errp, "NBD server already running");
125         return;
126     }
128     nbd_server = g_new0(NBDServerData, 1);
129     nbd_server->max_connections = max_connections;
130     nbd_server->listener = qio_net_listener_new();
132     qio_net_listener_set_name(nbd_server->listener,
133                               "nbd-listener");
135     if (qio_net_listener_open_sync(nbd_server->listener, addr, 1, errp) < 0) {
136         goto error;
137     }
139     if (tls_creds) {
140         nbd_server->tlscreds = nbd_get_tls_creds(tls_creds, errp);
141         if (!nbd_server->tlscreds) {
142             goto error;
143         }
145         /* TODO SOCKET_ADDRESS_TYPE_FD where fd has AF_INET or AF_INET6 */
146         if (addr->type != SOCKET_ADDRESS_TYPE_INET) {
147             error_setg(errp, "TLS is only supported with IPv4/IPv6");
148             goto error;
149         }
150     }
152     nbd_server->tlsauthz = g_strdup(tls_authz);
154     nbd_update_server_watch(nbd_server);
156     return;
158  error:
159     nbd_server_free(nbd_server);
160     nbd_server = NULL;
163 void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
165     nbd_server_start(arg->addr, arg->tls_creds, arg->tls_authz,
166                      arg->max_connections, errp);
169 void qmp_nbd_server_start(SocketAddressLegacy *addr,
170                           bool has_tls_creds, const char *tls_creds,
171                           bool has_tls_authz, const char *tls_authz,
172                           bool has_max_connections, uint32_t max_connections,
173                           Error **errp)
175     SocketAddress *addr_flat = socket_address_flatten(addr);
177     nbd_server_start(addr_flat, tls_creds, tls_authz, max_connections, errp);
178     qapi_free_SocketAddress(addr_flat);
181 void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
183     BlockExport *export;
184     BlockDriverState *bs;
185     BlockBackend *on_eject_blk;
186     BlockExportOptions *export_opts;
188     bs = bdrv_lookup_bs(arg->device, arg->device, errp);
189     if (!bs) {
190         return;
191     }
193     /*
194      * block-export-add would default to the node-name, but we may have to use
195      * the device name as a default here for compatibility.
196      */
197     if (!arg->has_name) {
198         arg->name = arg->device;
199     }
201     export_opts = g_new(BlockExportOptions, 1);
202     *export_opts = (BlockExportOptions) {
203         .type                   = BLOCK_EXPORT_TYPE_NBD,
204         .id                     = g_strdup(arg->name),
205         .node_name              = g_strdup(bdrv_get_node_name(bs)),
206         .has_writable           = arg->has_writable,
207         .writable               = arg->writable,
208         .u.nbd = {
209             .has_name           = true,
210             .name               = g_strdup(arg->name),
211             .has_description    = arg->has_description,
212             .description        = g_strdup(arg->description),
213             .has_bitmap         = arg->has_bitmap,
214             .bitmap             = g_strdup(arg->bitmap),
215         },
216     };
218     /*
219      * nbd-server-add doesn't complain when a read-only device should be
220      * exported as writable, but simply downgrades it. This is an error with
221      * block-export-add.
222      */
223     if (bdrv_is_read_only(bs)) {
224         export_opts->has_writable = true;
225         export_opts->writable = false;
226     }
228     export = blk_exp_add(export_opts, errp);
229     if (!export) {
230         goto fail;
231     }
233     /*
234      * nbd-server-add removes the export when the named BlockBackend used for
235      * @device goes away.
236      */
237     on_eject_blk = blk_by_name(arg->device);
238     if (on_eject_blk) {
239         nbd_export_set_on_eject_blk(export, on_eject_blk);
240     }
242 fail:
243     qapi_free_BlockExportOptions(export_opts);
246 void qmp_nbd_server_remove(const char *name,
247                            bool has_mode, BlockExportRemoveMode mode,
248                            Error **errp)
250     BlockExport *exp;
252     exp = blk_exp_find(name);
253     if (exp && exp->drv->type != BLOCK_EXPORT_TYPE_NBD) {
254         error_setg(errp, "Block export '%s' is not an NBD export", name);
255         return;
256     }
258     qmp_block_export_del(name, has_mode, mode, errp);
261 void qmp_nbd_server_stop(Error **errp)
263     if (!nbd_server) {
264         error_setg(errp, "NBD server not running");
265         return;
266     }
268     blk_exp_close_all_type(BLOCK_EXPORT_TYPE_NBD);
270     nbd_server_free(nbd_server);
271     nbd_server = NULL;