From nobody Tue Feb 10 01:32:49 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1589303080; cv=none; d=zohomail.com; s=zohoarc; b=FeTfpiXt5t8KxP0qZieEmHzPIFgQTqb973PunorAxL3Le+acIuVFPnujdKWQunc6O5zPH/y31IsAvHstqgkWXkZMrXd6O1SV+CYtZBOPH4Sdo6rt4yXiKVjdye3tACUmmBDbtWkUvF/lU3Y6TCfljnhsui3xXyvJMgJBnmBlZ+Q= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1589303080; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=zASR04zPoNFvDoH8WvVllsOZchmgdGZHYshCZ5g6KbQ=; b=LqamijRtCbrgvUipGvDJKnuiBTqXuHIXH99puAYnIAsUv9+jYLDdOdlM9/yC/EaTA+8nCPQ4Zr1ZDTBJtlL/+rUpdbRRNJ+EscWyAZW2E30Xc9IAGZYFIK+n3UbmX9OC3htr+DjBDev09dcqV6gg82PhbcOA8w/MNlzP3rjhLws= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1589303080383837.7365192354347; Tue, 12 May 2020 10:04:40 -0700 (PDT) Received: from localhost ([::1]:33534 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jYYKc-0002v7-Vy for importer@patchew.org; Tue, 12 May 2020 13:04:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52450) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jYY7l-0005Px-DF; Tue, 12 May 2020 12:51:21 -0400 Received: from relay.sw.ru ([185.231.240.75]:50556) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jYY7j-0001R8-1N; Tue, 12 May 2020 12:51:20 -0400 Received: from dhcp-172-16-25-136.sw.ru ([172.16.25.136] helo=localhost.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1jYY7C-0004nT-Jn; Tue, 12 May 2020 19:50:46 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH v4 04/15] block: Add chain helper functions Date: Tue, 12 May 2020 19:50:34 +0300 Message-Id: <1589302245-893269-5-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1589302245-893269-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1589302245-893269-1-git-send-email-andrey.shinkevich@virtuozzo.com> Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/12 10:53:25 X-ACL-Warn: Detected OS = Linux 3.1-3.10 X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: kwolf@redhat.com, fam@euphon.net, vsementsov@virtuozzo.com, armbru@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org, mreitz@redhat.com, jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Max Reitz Add some helper functions for skipping filters in a chain of block nodes. Signed-off-by: Max Reitz Reviewed-by: Vladimir Sementsov-Ogievskiy --- block.c | 55 +++++++++++++++++++++++++++++++++++++++++++= ++++ include/block/block_int.h | 3 +++ 2 files changed, 58 insertions(+) diff --git a/block.c b/block.c index b2aae2e..5b4ebfe 100644 --- a/block.c +++ b/block.c @@ -6863,3 +6863,58 @@ BdrvChild *bdrv_primary_child(BlockDriverState *bs) { return bdrv_filtered_rw_child(bs) ?: bs->file; } + +static BlockDriverState *bdrv_skip_filters(BlockDriverState *bs, + bool stop_on_explicit_filter) +{ + BdrvChild *filtered; + + if (!bs) { + return NULL; + } + + while (!(stop_on_explicit_filter && !bs->implicit)) { + filtered =3D bdrv_filtered_rw_child(bs); + if (!filtered) { + break; + } + bs =3D filtered->bs; + } + /* + * Note that this treats nodes with bs->drv =3D=3D NULL as not being + * R/W filters (bs->drv =3D=3D NULL should be replaced by something + * else anyway). + * The advantage of this behavior is that this function will thus + * always return a non-NULL value (given a non-NULL @bs). + */ + + return bs; +} + +/* + * Return the first BDS that has not been added implicitly or that + * does not have an RW-filtered child down the chain starting from @bs + * (including @bs itself). + */ +BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) +{ + return bdrv_skip_filters(bs, true); +} + +/* + * Return the first BDS that does not have an RW-filtered child down + * the chain starting from @bs (including @bs itself). + */ +BlockDriverState *bdrv_skip_rw_filters(BlockDriverState *bs) +{ + return bdrv_skip_filters(bs, false); +} + +/* + * For a backing chain, return the first non-filter backing image of + * the first non-filter image. + */ +BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) +{ + return bdrv_skip_rw_filters(bdrv_filtered_cow_bs(bdrv_skip_rw_filters(= bs))); +} diff --git a/include/block/block_int.h b/include/block/block_int.h index dca59e9..86f7666 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -1347,6 +1347,9 @@ BdrvChild *bdrv_filtered_child(BlockDriverState *bs); BdrvChild *bdrv_metadata_child(BlockDriverState *bs); BdrvChild *bdrv_storage_child(BlockDriverState *bs); BdrvChild *bdrv_primary_child(BlockDriverState *bs); +BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs); +BlockDriverState *bdrv_skip_rw_filters(BlockDriverState *bs); +BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs); =20 static inline BlockDriverState *child_bs(BdrvChild *child) { --=20 1.8.3.1