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nbd: allow setting of an export name for qemu-nbd server 

The qemu-nbd server currently always uses the old style protocol
since it never sets any export name. This is a problem because
future TLS support will require use of the new style protocol
negotiation.

This adds "--exportname NAME" / "-x NAME" arguments to qemu-nbd
which allow the user to set an explicit export name. When an
export name is set the server will always use the new style
NBD protocol.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1455129674-17255-11-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-02-10 18:41:08 +00:00 committed by Paolo Bonzini
parent e2a9d9a39d
commit 3d4b2f9c94
2 changed files with 15 additions and 2 deletions
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14
qemu-nbd.c
View File

@ -44,6 +44,7 @@
#define QEMU_NBD_OPT_OBJECT 5
static NBDExport *exp;
static bool newproto;
static int verbose;
static char *srcpath;
static SocketAddress *saddr;
@ -339,7 +340,7 @@ static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
nb_fds++;
nbd_update_server_watch();
nbd_client_new(exp, cioc, nbd_client_closed);
nbd_client_new(newproto ? NULL : exp, cioc, nbd_client_closed);
object_unref(OBJECT(cioc));
return TRUE;
@ -413,7 +414,7 @@ int main(int argc, char **argv)
off_t fd_size;
QemuOpts *sn_opts = NULL;
const char *sn_id_or_name = NULL;
const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:";
const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:";
struct option lopt[] = {
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'V' },
@ -437,6 +438,7 @@ int main(int argc, char **argv)
{ "persistent", 0, NULL, 't' },
{ "verbose", 0, NULL, 'v' },
{ "object", 1, NULL, QEMU_NBD_OPT_OBJECT },
{ "export-name", 1, NULL, 'x' },
{ NULL, 0, NULL, 0 }
};
int ch;
@ -453,6 +455,7 @@ int main(int argc, char **argv)
Error *local_err = NULL;
BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
QDict *options = NULL;
const char *export_name = NULL;
/* The client thread uses SIGTERM to interrupt the server. A signal
* handler ensures that "qemu-nbd -v -c" exits with a nice status code.
@ -604,6 +607,9 @@ int main(int argc, char **argv)
case 't':
persistent = 1;
break;
case 'x':
export_name = optarg;
break;
case 'v':
verbose = 1;
break;
@ -783,6 +789,10 @@ int main(int argc, char **argv)
error_report_err(local_err);
exit(EXIT_FAILURE);
}
if (export_name) {
nbd_export_set_name(exp, export_name);
newproto = true;
}
server_ioc = qio_channel_socket_new();
if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {

3
qemu-nbd.texi
View File

@ -73,6 +73,9 @@ Disconnect the device @var{dev}
Allow up to @var{num} clients to share the device (default @samp{1})
@item -t, --persistent
Don't exit on the last connection
@item -x NAME, --export-name=NAME
Set the NBD volume export name. This switches the server to use
the new style NBD protocol negotiation
@item -v, --verbose
Display extra debugging information
@item -h, --help