From nobody Sun Apr 13 19:27:55 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1630511598030127.02909871787199; Wed, 1 Sep 2021 08:53:18 -0700 (PDT) Received: from localhost ([::1]:57792 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mLSY9-0000Qk-0J for importer@patchew.org; Wed, 01 Sep 2021 11:53:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50196) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRzv-00069x-OY for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:55 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:44416) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRzs-0004DA-KF for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:55 -0400 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-558-dyA6XehTOq-TCWbNvMpowQ-1; Wed, 01 Sep 2021 11:17:50 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C91C9343A2; Wed, 1 Sep 2021 15:17:49 +0000 (UTC) Received: from localhost (unknown [10.39.193.250]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5418A12D4A; Wed, 1 Sep 2021 15:17:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630509472; 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=OL65wIE4BxrNWLRnooY3DoPoTZOak05Ktdp9P00olTQ=; b=eyfIi0CmrpcHCVn+y4mnkdscNxatYMlymoDNX8JFo0IESprnSaZbHGEsoBU/ss1fmeqBdK spGeHQQmxKvTKVISQjf0NRajuMDM8dbTuRA2vvawGtvQeNNtUupkPiJY7YlFLjcUVCGlsN eEONBLfvVH+d7aG5y6yJg0OiYEAXpAg= X-MC-Unique: dyA6XehTOq-TCWbNvMpowQ-1 From: Hanna Reitz To: qemu-block@nongnu.org Subject: [PULL 41/56] block/copy-before-write: make public block driver Date: Wed, 1 Sep 2021 17:16:04 +0200 Message-Id: <20210901151619.689075-42-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 10.5.11.11 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 Content-Transfer-Encoding: quoted-printable 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=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=unavailable 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1630511599927100001 Content-Type: text/plain; charset="utf-8" From: Vladimir Sementsov-Ogievskiy Finally, copy-before-write gets own .bdrv_open and .bdrv_close handlers, block_init() call and becomes available through bdrv_open(). To achieve this: - cbw_init gets unused flags argument and becomes cbw_open - block_copy_state_free() call moved to new cbw_close() - in bdrv_cbw_append: - options are completed with driver and node-name, and we can simply use bdrv_insert_node() to do both open and drained replacing - in bdrv_cbw_drop: - cbw_close() is now responsible for freeing s->bcs, so don't do it here Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <20210824083856.17408-22-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz --- block/copy-before-write.c | 60 ++++++++++++++++++--------------------- 1 file changed, 28 insertions(+), 32 deletions(-) diff --git a/block/copy-before-write.c b/block/copy-before-write.c index 2efe098aae..2cd68b480a 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -144,7 +144,8 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvCh= ild *c, } } =20 -static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp) +static int cbw_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) { BDRVCopyBeforeWriteState *s =3D bs->opaque; BdrvDirtyBitmap *copy_bitmap; @@ -181,10 +182,21 @@ static int cbw_init(BlockDriverState *bs, QDict *opti= ons, Error **errp) return 0; } =20 +static void cbw_close(BlockDriverState *bs) +{ + BDRVCopyBeforeWriteState *s =3D bs->opaque; + + block_copy_state_free(s->bcs); + s->bcs =3D NULL; +} + BlockDriver bdrv_cbw_filter =3D { .format_name =3D "copy-before-write", .instance_size =3D sizeof(BDRVCopyBeforeWriteState), =20 + .bdrv_open =3D cbw_open, + .bdrv_close =3D cbw_close, + .bdrv_co_preadv =3D cbw_co_preadv, .bdrv_co_pwritev =3D cbw_co_pwritev, .bdrv_co_pwrite_zeroes =3D cbw_co_pwrite_zeroes, @@ -205,56 +217,40 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *s= ource, Error **errp) { ERRP_GUARD(); - int ret; BDRVCopyBeforeWriteState *state; BlockDriverState *top; QDict *opts; =20 assert(source->total_sectors =3D=3D target->total_sectors); =20 - top =3D bdrv_new_open_driver(&bdrv_cbw_filter, filter_node_name, - BDRV_O_RDWR, errp); - if (!top) { - error_prepend(errp, "Cannot open driver: "); - return NULL; - } - state =3D top->opaque; - opts =3D qdict_new(); + qdict_put_str(opts, "driver", "copy-before-write"); + if (filter_node_name) { + qdict_put_str(opts, "node-name", filter_node_name); + } qdict_put_str(opts, "file", bdrv_get_node_name(source)); qdict_put_str(opts, "target", bdrv_get_node_name(target)); =20 - ret =3D cbw_init(top, opts, errp); - qobject_unref(opts); - if (ret < 0) { - goto fail; - } - - bdrv_drained_begin(source); - ret =3D bdrv_replace_node(source, top, errp); - bdrv_drained_end(source); - if (ret < 0) { - error_prepend(errp, "Cannot append copy-before-write filter: "); - goto fail; + top =3D bdrv_insert_node(source, opts, BDRV_O_RDWR, errp); + if (!top) { + return NULL; } =20 + state =3D top->opaque; *bcs =3D state->bcs; =20 return top; - -fail: - block_copy_state_free(state->bcs); - bdrv_unref(top); - return NULL; } =20 void bdrv_cbw_drop(BlockDriverState *bs) { - BDRVCopyBeforeWriteState *s =3D bs->opaque; - bdrv_drop_filter(bs, &error_abort); - - block_copy_state_free(s->bcs); - bdrv_unref(bs); } + +static void cbw_init(void) +{ + bdrv_register(&bdrv_cbw_filter); +} + +block_init(cbw_init); --=20 2.31.1