From patchwork Wed Sep 1 15:15:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hanna Czenczek X-Patchwork-Id: 12469659 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EA90C432BE for ; Wed, 1 Sep 2021 15:44:35 +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 CC1A360F3A for ; Wed, 1 Sep 2021 15:44:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CC1A360F3A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:36462 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mLSPh-0002gO-Tw for qemu-devel@archiver.kernel.org; Wed, 01 Sep 2021 11:44:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49960) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRzg-0005cH-7H for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:52823) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRze-00040y-7N for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630509457; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pbtRkyCBuEz6z3CiRjmQtrZUxsSXudROhZETeyLgJks=; b=XvyEJu6eQ9Ig9o4jgxDznuvAsznipp4rAU5x3kVBXPwhuBkWb+9EyMe6hFFETZQyMIoONF MeCsGH85THvJLa92kRRVKzrhKZzkl0hFdNa7w5VBCG+z9tFMaplI32qx1xzq0dmGFWWmzJ VbxLPBHO25hR7x9I6aM2S24z0nLOsHM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-120-wPJ2U6UhN5qufrPixdJ-ow-1; Wed, 01 Sep 2021 11:17:36 -0400 X-MC-Unique: wPJ2U6UhN5qufrPixdJ-ow-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 500F71B2C980; Wed, 1 Sep 2021 15:17:35 +0000 (UTC) Received: from localhost (unknown [10.39.193.250]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CE5175C1BB; Wed, 1 Sep 2021 15:17:34 +0000 (UTC) From: Hanna Reitz To: qemu-block@nongnu.org Subject: [PULL 34/56] block/copy-before-write: introduce cbw_init() Date: Wed, 1 Sep 2021 17:15:57 +0200 Message-Id: <20210901151619.689075-35-hreitz@redhat.com> In-Reply-To: <20210901151619.689075-1-hreitz@redhat.com> References: <20210901151619.689075-1-hreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=hreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.392, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Kevin Wolf , Peter Maydell , Hanna Reitz , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Vladimir Sementsov-Ogievskiy Move part of bdrv_cbw_append() to new function cbw_open(). It's an intermediate step for adding normal .bdrv_open() handler to the filter. With this commit no logic is changed, but we have a function which will be turned into .bdrv_open() handler in future commit. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <20210824083856.17408-15-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz --- block/copy-before-write.c | 69 +++++++++++++++++++++++---------------- 1 file changed, 41 insertions(+), 28 deletions(-) diff --git a/block/copy-before-write.c b/block/copy-before-write.c index adbbc64aa9..a4fee645fd 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -144,6 +144,45 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c, } } +static int cbw_init(BlockDriverState *top, BlockDriverState *source, + BlockDriverState *target, bool compress, Error **errp) +{ + BDRVCopyBeforeWriteState *state = top->opaque; + + top->total_sectors = source->total_sectors; + top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | + (BDRV_REQ_FUA & source->supported_write_flags); + top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | + ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & + source->supported_zero_flags); + + bdrv_ref(target); + state->target = bdrv_attach_child(top, target, "target", &child_of_bds, + BDRV_CHILD_DATA, errp); + if (!state->target) { + error_prepend(errp, "Cannot attach target child: "); + return -EINVAL; + } + + bdrv_ref(source); + top->file = bdrv_attach_child(top, source, "file", &child_of_bds, + BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, + errp); + if (!top->file) { + error_prepend(errp, "Cannot attach file child: "); + return -EINVAL; + } + + state->bcs = block_copy_state_new(top->file, state->target, false, compress, + errp); + if (!state->bcs) { + error_prepend(errp, "Cannot create block-copy-state: "); + return -EINVAL; + } + + return 0; +} + BlockDriver bdrv_cbw_filter = { .format_name = "copy-before-write", .instance_size = sizeof(BDRVCopyBeforeWriteState), @@ -181,36 +220,10 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source, error_prepend(errp, "Cannot open driver: "); return NULL; } - state = top->opaque; - top->total_sectors = source->total_sectors; - top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | - (BDRV_REQ_FUA & source->supported_write_flags); - top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | - ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & - source->supported_zero_flags); - - bdrv_ref(target); - state->target = bdrv_attach_child(top, target, "target", &child_of_bds, - BDRV_CHILD_DATA, errp); - if (!state->target) { - error_prepend(errp, "Cannot attach target child: "); - goto fail; - } - bdrv_ref(source); - top->file = bdrv_attach_child(top, source, "file", &child_of_bds, - BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, - errp); - if (!top->file) { - error_prepend(errp, "Cannot attach file child: "); - goto fail; - } - - state->bcs = block_copy_state_new(top->file, state->target, false, compress, - errp); - if (!state->bcs) { - error_prepend(errp, "Cannot create block-copy-state: "); + ret = cbw_init(top, source, target, compress, errp); + if (ret < 0) { goto fail; }