From patchwork Thu Oct 10 11:42:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 11183345 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B98B1139A for ; Thu, 10 Oct 2019 12:13:58 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9A40520673 for ; Thu, 10 Oct 2019 12:13:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A40520673 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:37000 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIXKP-0007WI-Bb for patchwork-qemu-devel@patchwork.kernel.org; Thu, 10 Oct 2019 08:13:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51841) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIWr5-0006cb-Jq for qemu-devel@nongnu.org; Thu, 10 Oct 2019 07:43:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iIWr3-0008Cu-Qu for qemu-devel@nongnu.org; Thu, 10 Oct 2019 07:43:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49946) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iIWqy-0008BE-7n; Thu, 10 Oct 2019 07:43:32 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6F8A619D369; Thu, 10 Oct 2019 11:43:31 +0000 (UTC) Received: from localhost (unknown [10.36.118.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1355860A9F; Thu, 10 Oct 2019 11:43:30 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PULL 13/36] block: teach bdrv_debug_breakpoint skip filters with backing Date: Thu, 10 Oct 2019 13:42:37 +0200 Message-Id: <20191010114300.7746-14-mreitz@redhat.com> In-Reply-To: <20191010114300.7746-1-mreitz@redhat.com> References: <20191010114300.7746-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 10 Oct 2019 11:43:31 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Vladimir Sementsov-Ogievskiy Teach bdrv_debug_breakpoint and bdrv_debug_remove_breakpoint skip filters with backing. This is needed to implement and use in backup job it's own backup_top filter driver (like mirror already has one), and without this improvement, breakpoint removal will fail at least in 55 iotest. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-id: 20190920142056.12778-9-vsementsov@virtuozzo.com Signed-off-by: Max Reitz --- block.c | 34 ++++++++++++++++++++++++++-------- 1 file changed, 26 insertions(+), 8 deletions(-) diff --git a/block.c b/block.c index 5944124845..1c7c199849 100644 --- a/block.c +++ b/block.c @@ -5164,14 +5164,35 @@ void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) bs->drv->bdrv_debug_event(bs, event); } -int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, - const char *tag) +static BlockDriverState *bdrv_find_debug_node(BlockDriverState *bs) { while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { - bs = bs->file ? bs->file->bs : NULL; + if (bs->file) { + bs = bs->file->bs; + continue; + } + + if (bs->drv->is_filter && bs->backing) { + bs = bs->backing->bs; + continue; + } + + break; } if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { + assert(bs->drv->bdrv_debug_remove_breakpoint); + return bs; + } + + return NULL; +} + +int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, + const char *tag) +{ + bs = bdrv_find_debug_node(bs); + if (bs) { return bs->drv->bdrv_debug_breakpoint(bs, event, tag); } @@ -5180,11 +5201,8 @@ int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) { - while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { - bs = bs->file ? bs->file->bs : NULL; - } - - if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { + bs = bdrv_find_debug_node(bs); + if (bs) { return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); }