From patchwork Mon Apr 8 18:22:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 10889953 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7D8C517E1 for ; Mon, 8 Apr 2019 18:24:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 686632858B for ; Mon, 8 Apr 2019 18:24:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5C00728821; Mon, 8 Apr 2019 18:24:01 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C39382880A for ; Mon, 8 Apr 2019 18:24:00 +0000 (UTC) Received: from localhost ([127.0.0.1]:57028 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDYw4-0004RD-3U for patchwork-qemu-devel@patchwork.kernel.org; Mon, 08 Apr 2019 14:24:00 -0400 Received: from eggs.gnu.org ([209.51.188.92]:56818) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDYud-0003Gl-W6 for qemu-devel@nongnu.org; Mon, 08 Apr 2019 14:22:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hDYub-0003wg-DR for qemu-devel@nongnu.org; Mon, 08 Apr 2019 14:22:31 -0400 Received: from relay.sw.ru ([185.231.240.75]:53856) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hDYuZ-0003tN-IY; Mon, 08 Apr 2019 14:22:29 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1hDYuU-0002Da-5Q; Mon, 08 Apr 2019 21:22:22 +0300 From: Andrey Shinkevich To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Mon, 8 Apr 2019 21:22:19 +0300 Message-Id: <1554747741-918964-2-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1554747741-918964-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1554747741-918964-1-git-send-email-andrey.shinkevich@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v4 1/3] block: include base when checking image chain for block allocation 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: fam@euphon.net, kwolf@redhat.com, vsementsov@virtuozzo.com, berto@igalia.com, mreitz@redhat.com, stefanha@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch is used in the 'block/stream: introduce a bottom node' that is following. Instead of the base node, the caller may pass the node that has the base as its backing image to the function bdrv_is_allocated_above() with a new parameter include_base = true and get rid of the dependency on the base that may change during commit/stream parallel jobs. Now, if the specified base is not found in the backing image chain, the QEMU will crash. Suggested-by: Vladimir Sementsov-Ogievskiy Signed-off-by: Andrey Shinkevich Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Alberto Garcia --- block/commit.c | 2 +- block/io.c | 14 +++++++++++--- block/mirror.c | 2 +- block/replication.c | 2 +- block/stream.c | 2 +- include/block/block.h | 3 ++- 6 files changed, 17 insertions(+), 8 deletions(-) diff --git a/block/commit.c b/block/commit.c index ba60fef..1bd5284 100644 --- a/block/commit.c +++ b/block/commit.c @@ -177,7 +177,7 @@ static int coroutine_fn commit_run(Job *job, Error **errp) break; } /* Copy if allocated above the base */ - ret = bdrv_is_allocated_above(blk_bs(s->top), blk_bs(s->base), + ret = bdrv_is_allocated_above(blk_bs(s->top), blk_bs(s->base), false, offset, COMMIT_BUFFER_SIZE, &n); copy = (ret == 1); trace_commit_one_iteration(s, offset, n, ret); diff --git a/block/io.c b/block/io.c index dfc153b..1ed4164 100644 --- a/block/io.c +++ b/block/io.c @@ -2317,7 +2317,8 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t offset, * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] * * Return true if (a prefix of) the given range is allocated in any image - * between BASE and TOP (inclusive). BASE can be NULL to check if the given + * between BASE and TOP (TOP included). To check the BASE image, set the + * 'include_base' to 'true'. The BASE can be NULL to check if the given * offset is allocated in any image of the chain. Return false otherwise, * or negative errno on failure. * @@ -2331,14 +2332,17 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t offset, */ int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, - int64_t offset, int64_t bytes, int64_t *pnum) + bool include_base, int64_t offset, + int64_t bytes, int64_t *pnum) { BlockDriverState *intermediate; int ret; int64_t n = bytes; + assert(base || !include_base); + intermediate = top; - while (intermediate && intermediate != base) { + while (include_base || intermediate != base) { int64_t pnum_inter; int64_t size_inter; @@ -2360,6 +2364,10 @@ int bdrv_is_allocated_above(BlockDriverState *top, n = pnum_inter; } + if (intermediate == base) { + break; + } + intermediate = backing_bs(intermediate); } diff --git a/block/mirror.c b/block/mirror.c index ff15cfb..923548f 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -807,7 +807,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) return 0; } - ret = bdrv_is_allocated_above(bs, base, offset, bytes, &count); + ret = bdrv_is_allocated_above(bs, base, false, offset, bytes, &count); if (ret < 0) { return ret; } diff --git a/block/replication.c b/block/replication.c index 3d4dedd..fc8d2ad 100644 --- a/block/replication.c +++ b/block/replication.c @@ -272,7 +272,7 @@ static coroutine_fn int replication_co_writev(BlockDriverState *bs, while (remaining_sectors > 0) { int64_t count; - ret = bdrv_is_allocated_above(top->bs, base->bs, + ret = bdrv_is_allocated_above(top->bs, base->bs, false, sector_num * BDRV_SECTOR_SIZE, remaining_sectors * BDRV_SECTOR_SIZE, &count); diff --git a/block/stream.c b/block/stream.c index bfaebb8..0920092 100644 --- a/block/stream.c +++ b/block/stream.c @@ -162,7 +162,7 @@ static int coroutine_fn stream_run(Job *job, Error **errp) } else if (ret >= 0) { /* Copy if allocated in the intermediate images. Limit to the * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE). */ - ret = bdrv_is_allocated_above(backing_bs(bs), base, + ret = bdrv_is_allocated_above(backing_bs(bs), base, false, offset, n, &n); /* Finish early if end of backing file has been reached */ diff --git a/include/block/block.h b/include/block/block.h index c7a2619..f98e858 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -447,7 +447,8 @@ int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, int64_t *pnum); int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, - int64_t offset, int64_t bytes, int64_t *pnum); + bool include_base, int64_t offset, int64_t bytes, + int64_t *pnum); bool bdrv_is_read_only(BlockDriverState *bs); int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only,