nbd: pass export name as init argument

There is no need to keep the export name around, and it seems a better
fit as an argument in the init() call.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

block/nbd-client.c

@@ -338,18 +338,17 @@ static void nbd_teardown_connection(NbdClientSession *client)
 void nbd_client_session_close(NbdClientSession *client)
 {
     nbd_teardown_connection(client);
-    g_free(client->export_name);
-    client->export_name = NULL;
 }
 
-int nbd_client_session_init(NbdClientSession *client,
-    BlockDriverState *bs, int sock)
+int nbd_client_session_init(NbdClientSession *client, BlockDriverState *bs,
+    int sock, const char *export)
 {
     int ret;
 
     /* NBD handshake */
+    logout("session init %s\n", export);
     qemu_set_block(sock);
-    ret = nbd_receive_negotiate(sock, client->export_name,
+    ret = nbd_receive_negotiate(sock, export,
                                 &client->nbdflags, &client->size,
                                 &client->blocksize);
     if (ret < 0) {

block/nbd-client.h

@@ -30,14 +30,13 @@ typedef struct NbdClientSession {
     Coroutine *recv_coroutine[MAX_NBD_REQUESTS];
     struct nbd_reply reply;
 
-    char *export_name; /* An NBD server may export several devices */
     bool is_unix;
 
     BlockDriverState *bs;
 } NbdClientSession;
 
-int nbd_client_session_init(NbdClientSession *client,
-                            BlockDriverState *bs, int sock);
+int nbd_client_session_init(NbdClientSession *client, BlockDriverState *bs,
+                            int sock, const char *export_name);
 void nbd_client_session_close(NbdClientSession *client);
 
 int nbd_client_session_co_discard(NbdClientSession *client, int64_t sector_num,

block/nbd.c

@@ -188,7 +188,7 @@ out:
     g_free(file);
 }
 
-static int nbd_config(BDRVNBDState *s, QDict *options)
+static int nbd_config(BDRVNBDState *s, QDict *options, char **export)
 {
     Error *local_err = NULL;
 
@@ -218,8 +218,8 @@ static int nbd_config(BDRVNBDState *s, QDict *options)
         qemu_opt_set_number(s->socket_opts, "port", NBD_DEFAULT_PORT);
     }
 
-    s->client.export_name = g_strdup(qdict_get_try_str(options, "export"));
-    if (s->client.export_name) {
+    *export = g_strdup(qdict_get_try_str(options, "export"));
+    if (*export) {
         qdict_del(options, "export");
     }
 
@@ -253,10 +253,11 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
                     Error **errp)
 {
     BDRVNBDState *s = bs->opaque;
+    char *export = NULL;
     int result, sock;
 
     /* Pop the config into our state object. Exit if invalid. */
-    result = nbd_config(s, options);
+    result = nbd_config(s, options, &export);
     if (result != 0) {
         return result;
     }
@@ -270,7 +271,9 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     /* NBD handshake */
-    return nbd_client_session_init(&s->client, bs, sock);
+    result = nbd_client_session_init(&s->client, bs, sock, export);
+    g_free(export);
+    return result;
 }
 
 static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num,