From nobody Tue Nov 11 04:56:28 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.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 ARC-Seal: i=1; a=rsa-sha256; t=1560993832; cv=none; d=zoho.com; s=zohoarc; b=nv9x67LsUGnknSldzLrci5vaO6+7kOPPfX+aOV7Hd6Ch409eGys6jno2mEGK53LFDWca163qMPT0aNwApQQ11DNxjjRy3SUnpYz7ZEIDiiUJwTnCW6vro1zsvW1gWmvZKHLcjtbGp0lzlC3Ws1UD4EHgEZAmplHahjUn6xqmfLw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1560993832; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=Wj+W6qwP43EeRJSvr8xFM6rpoEt7Ktnf7q736xwdGK0=; b=fcHC2sAPIw6wp6GO50f/eljQhHsISlcfKtwmu207JvCcPsvAHF+FszH7PGvZleU/PHGIQS6yagUz2dxNkH8lVVZRd7LRjXqBaFaj8qkxbTLyVaWzijYGVqrmGERGxnlAaA2c1KxiqBuCfWtSMNiERLf8B2PqXyoQpdDlbLp0oGo= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.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 (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1560993832785539.4128701961805; Wed, 19 Jun 2019 18:23:52 -0700 (PDT) Received: from localhost ([::1]:42976 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdlnm-0002f8-RY for importer@patchew.org; Wed, 19 Jun 2019 21:23:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40725) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdle7-0002G1-0k for qemu-devel@nongnu.org; Wed, 19 Jun 2019 21:13:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hdlUr-0004rq-1T for qemu-devel@nongnu.org; Wed, 19 Jun 2019 21:04:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53400) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hdlUp-0004po-KV; Wed, 19 Jun 2019 21:04:11 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CF99D81F1B; Thu, 20 Jun 2019 01:04:10 +0000 (UTC) Received: from probe.bos.redhat.com (dhcp-17-164.bos.redhat.com [10.18.17.164]) by smtp.corp.redhat.com (Postfix) with ESMTP id B26161001E67; Thu, 20 Jun 2019 01:04:09 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Wed, 19 Jun 2019 21:03:50 -0400 Message-Id: <20190620010356.19164-7-jsnow@redhat.com> In-Reply-To: <20190620010356.19164-1-jsnow@redhat.com> References: <20190620010356.19164-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 20 Jun 2019 01:04:10 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 06/12] block/dirty-bitmap: add bdrv_dirty_bitmap_claim 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 , Fam Zheng , vsementsov@virtuozzo.com, Wen Congyang , Xie Changlong , Markus Armbruster , Max Reitz , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" This function can claim an hbitmap to replace its own current hbitmap. In the case that the granularities do not match, it will use hbitmap_merge to copy the bit data instead. Signed-off-by: John Snow --- include/block/block_int.h | 1 + include/qemu/hbitmap.h | 8 ++++++++ block/dirty-bitmap.c | 14 ++++++++++++++ util/hbitmap.c | 5 +++++ 4 files changed, 28 insertions(+) diff --git a/include/block/block_int.h b/include/block/block_int.h index 89370c1b9b..7348ea8e78 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -1240,6 +1240,7 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t off= set, int64_t bytes); =20 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup); +void bdrv_dirty_bitmap_claim(BdrvDirtyBitmap *bitmap, HBitmap **hbitmap); =20 void bdrv_inc_in_flight(BlockDriverState *bs); void bdrv_dec_in_flight(BlockDriverState *bs); diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h index 4afbe6292e..c74519042a 100644 --- a/include/qemu/hbitmap.h +++ b/include/qemu/hbitmap.h @@ -82,6 +82,14 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size); */ bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result); =20 +/** + * hbitmap_same_conf: + * + * Compares the configuration for HBitmaps A and B. + * Return true if they are identical, false otherwise. + */ +bool hbitmap_same_conf(const HBitmap *a, const HBitmap *b); + /** * hbitmap_can_merge: * diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index 95a9c2a5d8..15c857e445 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -632,6 +632,20 @@ void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap= , HBitmap *backup) hbitmap_free(tmp); } =20 +/* claim ownership of an hbitmap */ +void bdrv_dirty_bitmap_claim(BdrvDirtyBitmap *bitmap, HBitmap **hbitmap) +{ + if (hbitmap_same_conf(bitmap->bitmap, *hbitmap)) { + bdrv_restore_dirty_bitmap(bitmap, *hbitmap); + } else { + assert(hbitmap_can_merge(bitmap->bitmap, *hbitmap)); + bdrv_clear_dirty_bitmap(bitmap, NULL); + hbitmap_merge(bitmap->bitmap, *hbitmap, bitmap->bitmap); + hbitmap_free(*hbitmap); + } + *hbitmap =3D NULL; +} + uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitma= p, uint64_t offset, uint64_t by= tes) { diff --git a/util/hbitmap.c b/util/hbitmap.c index 0d6724b7bc..a2abd425b5 100644 --- a/util/hbitmap.c +++ b/util/hbitmap.c @@ -775,6 +775,11 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size) } } =20 +bool hbitmap_same_conf(const HBitmap *a, const HBitmap *b) +{ + return (a->size =3D=3D b->size) && (a->granularity =3D=3D b->granulari= ty); +} + bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b) { return (a->size =3D=3D b->size); --=20 2.21.0