From patchwork Wed Apr 6 17:57:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 8764241 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1103E9F3D1 for ; Wed, 6 Apr 2016 17:59:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 79A9F201E4 for ; Wed, 6 Apr 2016 17:59:44 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C43202013D for ; Wed, 6 Apr 2016 17:59:43 +0000 (UTC) Received: from localhost ([::1]:44814 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1anrjz-0004hE-9k for patchwork-qemu-devel@patchwork.kernel.org; Wed, 06 Apr 2016 13:59:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54373) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1anri0-00011b-UO for qemu-devel@nongnu.org; Wed, 06 Apr 2016 13:57:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1anrhz-0006Xt-R4 for qemu-devel@nongnu.org; Wed, 06 Apr 2016 13:57:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42426) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1anrht-0006W9-HQ; Wed, 06 Apr 2016 13:57:33 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 18D7965413; Wed, 6 Apr 2016 17:57:33 +0000 (UTC) Received: from localhost (ovpn-116-130.ams2.redhat.com [10.36.116.130]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u36HvV3A013936 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 6 Apr 2016 13:57:32 -0400 From: Max Reitz To: qemu-block@nongnu.org Date: Wed, 6 Apr 2016 19:57:13 +0200 Message-Id: <1459965434-21531-8-git-send-email-mreitz@redhat.com> In-Reply-To: <1459965434-21531-1-git-send-email-mreitz@redhat.com> References: <1459965434-21531-1-git-send-email-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 06 Apr 2016 17:57:33 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Cc: Kevin Wolf , Alberto Garcia , qemu-devel@nongnu.org, Max Reitz Subject: [Qemu-devel] [PATCH v2 for-2.7 7/8] block: Assert !bs->refcnt in bdrv_close() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The only caller of bdrv_close() left is bdrv_delete(). We may as well assert that, in a way (there are some things in bdrv_close() that make more sense under that assumption, such as the call to bdrv_release_all_dirty_bitmaps() which in turn assumes that no frozen bitmaps are attached to the BDS). In addition, being called only in bdrv_delete() means that we can drop bdrv_close()'s forward declaration at the top of block.c. Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia Reviewed-by: Kevin Wolf --- block.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/block.c b/block.c index 355c4be..963abcc 100644 --- a/block.c +++ b/block.c @@ -74,8 +74,6 @@ static BlockDriverState *bdrv_open_inherit(const char *filename, /* If non-zero, use only whitelisted block drivers */ static int use_bdrv_whitelist; -static void bdrv_close(BlockDriverState *bs); - #ifdef _WIN32 static int is_windows_drive_prefix(const char *filename) { @@ -2106,6 +2104,7 @@ static void bdrv_close(BlockDriverState *bs) BdrvAioNotifier *ban, *ban_next; assert(!bs->job); + assert(!bs->refcnt); bdrv_drained_begin(bs); /* complete I/O */ bdrv_flush(bs);