From patchwork Thu May 11 02:20:33 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 9720829 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5628B60236 for ; Thu, 11 May 2017 02:28:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F23B285F0 for ; Thu, 11 May 2017 02:28:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 529A328617; Thu, 11 May 2017 02:28:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CB77E285F0 for ; Thu, 11 May 2017 02:28:17 +0000 (UTC) Received: from localhost ([::1]:45600 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d8dpw-0008Se-Pe for patchwork-qemu-devel@patchwork.kernel.org; Wed, 10 May 2017 22:28:16 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41172) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d8djI-0003PR-3u for qemu-devel@nongnu.org; Wed, 10 May 2017 22:21:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d8djG-0005dF-UM for qemu-devel@nongnu.org; Wed, 10 May 2017 22:21:24 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60748) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d8djB-0005YK-Hz; Wed, 10 May 2017 22:21:17 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id A109AC057FAD; Thu, 11 May 2017 02:21:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com A109AC057FAD Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=eblake@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com A109AC057FAD Received: from red.redhat.com (ovpn-120-208.rdu2.redhat.com [10.10.120.208]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1DC327815F; Thu, 11 May 2017 02:21:14 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Wed, 10 May 2017 21:20:33 -0500 Message-Id: <20170511022036.32225-18-eblake@redhat.com> In-Reply-To: <20170511022036.32225-1-eblake@redhat.com> References: <20170511022036.32225-1-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Thu, 11 May 2017 02:21:16 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 17/20] backup: Switch backup_run() to byte-based X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Jeff Cody , jsnow@redhat.com, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP We are gradually converting to byte-based interfaces, as they are easier to reason about than sector-based. Change the internal loop iteration of backups to track by bytes instead of sectors (although we are still guaranteed that we iterate by steps that are cluster-aligned). Signed-off-by: Eric Blake Reviewed-by: John Snow --- v2: no change --- block/backup.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/block/backup.c b/block/backup.c index 6aa7d1a..1d3a3ce 100644 --- a/block/backup.c +++ b/block/backup.c @@ -370,11 +370,10 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) int ret = 0; int clusters_per_iter; uint32_t granularity; - int64_t sector; + int64_t offset; int64_t cluster; int64_t end; int64_t last_cluster = -1; - int64_t sectors_per_cluster = cluster_size_sectors(job); BdrvDirtyBitmapIter *dbi; granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap); @@ -382,8 +381,8 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0); /* Find the next dirty sector(s) */ - while ((sector = bdrv_dirty_iter_next(dbi)) != -1) { - cluster = sector / sectors_per_cluster; + while ((offset = bdrv_dirty_iter_next(dbi) * BDRV_SECTOR_SIZE) >= 0) { + cluster = offset / job->cluster_size; /* Fake progress updates for any clusters we skipped */ if (cluster != last_cluster + 1) { @@ -410,7 +409,8 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) /* If the bitmap granularity is smaller than the backup granularity, * we need to advance the iterator pointer to the next cluster. */ if (granularity < job->cluster_size) { - bdrv_set_dirty_iter(dbi, cluster * sectors_per_cluster); + bdrv_set_dirty_iter(dbi, + cluster * job->cluster_size / BDRV_SECTOR_SIZE); } last_cluster = cluster - 1; @@ -432,17 +432,15 @@ static void coroutine_fn backup_run(void *opaque) BackupBlockJob *job = opaque; BackupCompleteData *data; BlockDriverState *bs = blk_bs(job->common.blk); - int64_t start, end; + int64_t offset; int64_t sectors_per_cluster = cluster_size_sectors(job); int ret = 0; QLIST_INIT(&job->inflight_reqs); qemu_co_rwlock_init(&job->flush_rwlock); - start = 0; - end = DIV_ROUND_UP(job->common.len, job->cluster_size); - - job->done_bitmap = bitmap_new(end); + job->done_bitmap = bitmap_new(DIV_ROUND_UP(job->common.len, + job->cluster_size)); job->before_write.notify = backup_before_write_notify; bdrv_add_before_write_notifier(bs, &job->before_write); @@ -457,7 +455,8 @@ static void coroutine_fn backup_run(void *opaque) ret = backup_run_incremental(job); } else { /* Both FULL and TOP SYNC_MODE's require copying.. */ - for (; start < end; start++) { + for (offset = 0; offset < job->common.len; + offset += job->cluster_size) { bool error_is_read; int alloced = 0; @@ -480,8 +479,8 @@ static void coroutine_fn backup_run(void *opaque) * needed but at some point that is always the case. */ alloced = bdrv_is_allocated(bs, - start * sectors_per_cluster + i, - sectors_per_cluster - i, &n); + (offset >> BDRV_SECTOR_BITS) + i, + sectors_per_cluster - i, &n); i += n; if (alloced || n == 0) { @@ -499,9 +498,8 @@ static void coroutine_fn backup_run(void *opaque) if (alloced < 0) { ret = alloced; } else { - ret = backup_do_cow(job, start * job->cluster_size, - job->cluster_size, &error_is_read, - false); + ret = backup_do_cow(job, offset, job->cluster_size, + &error_is_read, false); } if (ret < 0) { /* Depending on error action, fail now or retry cluster */ @@ -510,7 +508,7 @@ static void coroutine_fn backup_run(void *opaque) if (action == BLOCK_ERROR_ACTION_REPORT) { break; } else { - start--; + offset -= job->cluster_size; continue; } }