nbd/client: Move export name into NBDExportInfo

Refactor the 'name' parameter of nbd_receive_negotiate() from
being a separate parameter into being part of the in-out 'info'.
This also spills over to a simplification of nbd_opt_go().

The main driver for this refactoring is that an upcoming patch
would like to add support to qemu-nbd to list information about
all exports available on a server, where the name(s) will be
provided by the server instead of the client.  But another benefit
is that we can now allow the client to explicitly specify the
empty export name "" even when connecting to an oldstyle server
(even if qemu is no longer such a server after commit 7f7dfe2a).

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20190117193658.16413-10-eblake@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/block/nbd.h b/include/block/nbd.h
index 24be9570bb..00d3eb57d9 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -262,6 +262,7 @@ struct NBDExportInfo {
     /* Set by client before nbd_receive_negotiate() */
     bool request_sizes;
     char *x_dirty_bitmap;
+    char *name; /* must be non-NULL */
 
     /* In-out fields, set by client before nbd_receive_negotiate() and
      * updated by server results during nbd_receive_negotiate() */
@@ -279,10 +280,9 @@ struct NBDExportInfo {
 };
 typedef struct NBDExportInfo NBDExportInfo;
 
-int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
-                          QCryptoTLSCreds *tlscreds, const char *hostname,
-                          QIOChannel **outioc, NBDExportInfo *info,
-                          Error **errp);
+int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCreds *tlscreds,
+                          const char *hostname, QIOChannel **outioc,
+                          NBDExportInfo *info, Error **errp);
 int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
              Error **errp);
 int nbd_send_request(QIOChannel *ioc, NBDRequest *request);