nbd: Always call "close_fn" in nbd_client_new

[qemu.git] / blockdev-nbd.c

diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 803181307194a100f5f467d94a11f925a3684f06..4a758ac31431af9ad6ba592f336b8199c2859e89 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 "sysemu/block-backend.h"
+#include "hw/block/block.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;
 
@@ -41,12 +41,13 @@ void qmp_nbd_server_start(SocketAddress *addr, Error **errp)
 
     server_fd = socket_listen(addr, errp);
     if (server_fd != -1) {
-        qemu_set_fd_handler2(server_fd, NULL, nbd_accept, NULL, NULL);
+        qemu_set_fd_handler(server_fd, nbd_accept, NULL, NULL);
     }
 }
 
-/* Hook into the BlockDriverState notifiers to close the export when
- * the file is closed.
+/*
+ * Hook into the BlockBackend notifiers to close the export when the
+ * backend is closed.
  */
 typedef struct NBDCloseNotifier {
     Notifier n;
@@ -69,40 +70,53 @@ 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)
 {
-    BlockDriverState *bs;
+    BlockBackend *blk;
     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;
     }
 
-    bs = bdrv_find(device);
-    if (!bs) {
-        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+    blk = blk_by_name(device);
+    if (!blk) {
+        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                  "Device '%s' not found", device);
+        return;
+    }
+    if (!blk_is_inserted(blk)) {
+        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
         return;
     }
 
-    exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY,
-                         nbd_server_put_ref);
+    if (!has_writable) {
+        writable = false;
+    }
+    if (blk_is_read_only(blk)) {
+        writable = false;
+    }
+
+    exp = nbd_export_new(blk, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, NULL,
+                         errp);
+    if (!exp) {
+        return;
+    }
 
     nbd_export_set_name(exp, device);
-    drive_get_ref(drive_get_by_blockdev(bs));
 
-    n = g_malloc0(sizeof(NBDCloseNotifier));
+    n = g_new0(NBDCloseNotifier, 1);
     n->n.notify = nbd_close_notifier;
     n->exp = exp;
-    bdrv_add_close_notifier(bs, &n->n);
+    blk_add_close_notifier(blk, &n->n);
     QTAILQ_INSERT_TAIL(&close_notifiers, n, next);
 }
 
@@ -113,7 +127,9 @@ 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_handler(server_fd, NULL, NULL, NULL);
+        close(server_fd);
+        server_fd = -1;
+    }
 }