smc91c111: Fix receive starvation

[qemu.git] / blockdev-nbd.c

diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 803181307194a100f5f467d94a11f925a3684f06..922cf5657b99f23f4a8afc707c0e0bf79d03bbd0 100644 (file)
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -9,15 +9,15 @@
  * later.  See the COPYING file in the top-level directory.
  */
 
-#include "blockdev.h"
-#include "hw/block-common.h"
-#include "monitor.h"
-#include "qerror.h"
-#include "sysemu.h"
+#include "sysemu/blockdev.h"
+#include "hw/block/block.h"
+#include "monitor/monitor.h"
+#include "qapi/qmp/qerror.h"
+#include "sysemu/sysemu.h"
 #include "qmp-commands.h"
 #include "trace.h"
-#include "nbd.h"
-#include "qemu_socket.h"
+#include "block/nbd.h"
+#include "qemu/sockets.h"
 
 static int server_fd = -1;
 
@@ -69,12 +69,6 @@ static void nbd_close_notifier(Notifier *n, void *data)
     g_free(cn);
 }
 
-static void nbd_server_put_ref(NBDExport *exp)
-{
-    BlockDriverState *bs = nbd_export_get_blockdev(exp);
-    drive_put_ref(drive_get_by_blockdev(bs));
-}
-
 void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
                         Error **errp)
 {
@@ -82,6 +76,11 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
     NBDExport *exp;
     NBDCloseNotifier *n;
 
+    if (server_fd == -1) {
+        error_setg(errp, "NBD server not running");
+        return;
+    }
+
     if (nbd_export_find(device)) {
         error_setg(errp, "NBD server already exporting device '%s'", device);
         return;
@@ -93,11 +92,16 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
         return;
     }
 
-    exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY,
-                         nbd_server_put_ref);
+    if (!has_writable) {
+        writable = false;
+    }
+    if (bdrv_is_read_only(bs)) {
+        writable = false;
+    }
+
+    exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, NULL);
 
     nbd_export_set_name(exp, device);
-    drive_get_ref(drive_get_by_blockdev(bs));
 
     n = g_malloc0(sizeof(NBDCloseNotifier));
     n->n.notify = nbd_close_notifier;
@@ -113,7 +117,9 @@ void qmp_nbd_server_stop(Error **errp)
         nbd_close_notifier(&cn->n, nbd_export_get_blockdev(cn->exp));
     }
 
-    qemu_set_fd_handler2(server_fd, NULL, NULL, NULL, NULL);
-    close(server_fd);
-    server_fd = -1;
+    if (server_fd != -1) {
+        qemu_set_fd_handler2(server_fd, NULL, NULL, NULL, NULL);
+        close(server_fd);
+        server_fd = -1;
+    }
 }