From patchwork Mon Jun 8 19:08:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 281125 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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 6905FC433E0 for ; Mon, 8 Jun 2020 19:09:52 +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 2E49B2068D for ; Mon, 8 Jun 2020 19:09:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Ux+YWV24" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E49B2068D 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:33050 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jiN9b-0002b3-DZ for qemu-devel@archiver.kernel.org; Mon, 08 Jun 2020 15:09:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:32888) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jiN8P-0001w8-2P for qemu-devel@nongnu.org; Mon, 08 Jun 2020 15:08:37 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:31620 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jiN8K-0006uU-CP for qemu-devel@nongnu.org; Mon, 08 Jun 2020 15:08:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591643311; 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; bh=/u8us0VlqZQNTOvw0CeO2ZZNWirMI7O38faQs3enp0o=; b=Ux+YWV24BxwNYjyImSgheb7R87d/78gtP8/EPi7t5dkUl9nPBn1BtzO1Up9FypFX2gx+Ns uCFnV7Hjbm3idPQa8CVVF/1MlNaIFCeBMpAwbc61OBs+dJ3Byuqj6Aod2trGIs7voHNVYT aJsc33st02IniDYljSqTWDZNTR4lu/Y= 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-350-Z4CKihK4PlS0DILgfuCtgg-1; Mon, 08 Jun 2020 15:08:29 -0400 X-MC-Unique: Z4CKihK4PlS0DILgfuCtgg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 56BC518B6389; Mon, 8 Jun 2020 19:08:28 +0000 (UTC) Received: from blue.redhat.com (ovpn-113-22.phx2.redhat.com [10.3.113.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id E150E5D9F7; Mon, 8 Jun 2020 19:08:25 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH] qcow2: Tweak comments on qcow2_get_persistent_dirty_bitmap_size Date: Mon, 8 Jun 2020 14:08:21 -0500 Message-Id: <20200608190821.3293867-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/08 11:58:00 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-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: Kevin Wolf , Vladimir Sementsov-Ogievskiy , John Snow , "open list:qcow2" , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For now, we don't have persistent bitmaps in any other formats, but that might not be true in the future. Make it obvious that our incoming parameter is not necessarily a qcow2 image, and therefore is limited to just the bdrv_dirty_bitmap_* API calls (rather than probing into qcow2 internals). Suggested-by: Kevin Wolf Signed-off-by: Eric Blake --- block/qcow2-bitmap.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index 7bf12502da8c..1f38806ca6ea 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -1757,19 +1757,20 @@ bool qcow2_supports_persistent_dirty_bitmap(BlockDriverState *bs) } /* - * Compute the space required for bitmaps in @bs. + * Compute the space required to copy bitmaps from @in_bs. * * The computation is based as if copying to a new image with the - * given @cluster_size, which may differ from the cluster size in @bs. + * given @cluster_size, which may differ from the cluster size in + * @in_bs; in fact, @in_bs might be something other than qcow2. */ -uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *bs, +uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *in_bs, uint32_t cluster_size) { uint64_t bitmaps_size = 0; BdrvDirtyBitmap *bm; size_t bitmap_dir_size = 0; - FOR_EACH_DIRTY_BITMAP(bs, bm) { + FOR_EACH_DIRTY_BITMAP(in_bs, bm) { if (bdrv_dirty_bitmap_get_persistence(bm)) { const char *name = bdrv_dirty_bitmap_name(bm); uint32_t granularity = bdrv_dirty_bitmap_granularity(bm);