From nobody Mon Feb 9 03:17:14 2026 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 ARC-Seal: i=1; a=rsa-sha256; t=1599833549; cv=none; d=zohomail.com; s=zohoarc; b=ehar1e4eystUFGv4Wfu5a0oC4WM5jvv4qNKEz2nZFVPxn82/3xJXaLIpOdLNxRq0AcOTB4c7OiVl92zr0dd5DZOdhKtFsXmkoDguvt+3iN1qtkDQ5DqC5PU7h/X9eAWNTKCoUl3GND/cCAbrcqh1dm586ARm7o2gKRqe/HUTmwM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1599833549; 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; bh=8tUH1cre38QiqztWRmULDkd1dxIU2P18eyDpmVz0nYc=; b=isjmTwl54ISxQWSq4uhI1d0eidhqnz6CBWXDbfR0wn12lw2rxjWQoTzLASwon8+Eao8FPZyFnSIehWYjXw6y1d/j4A9F/+bXwvpqTfeTGBhEQl1NEentULsTWuXDe60o0gEwWm7E9fp9wIHuCDWpFE0T2JAcaXHQcJGRgqM5bpo= ARC-Authentication-Results: i=1; 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1599833549543829.0077382380312; Fri, 11 Sep 2020 07:12:29 -0700 (PDT) Received: from localhost ([::1]:56852 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kGjmt-0006yH-St for importer@patchew.org; Fri, 11 Sep 2020 10:12:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45386) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kGjka-0004OR-Lj; Fri, 11 Sep 2020 10:10:04 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:50977) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kGjkW-0000hA-Bo; Fri, 11 Sep 2020 10:10:04 -0400 Received: from [81.0.39.67] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1kGjkS-0004om-00; Fri, 11 Sep 2020 16:09:56 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1kGjkF-0000zw-3D; Fri, 11 Sep 2020 16:09:43 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=8tUH1cre38QiqztWRmULDkd1dxIU2P18eyDpmVz0nYc=; b=cjMHGRlH3VzLqU9oy9/rnF2nTPQubbKJHJI8xlUmDeJqTZwWf4ZL1nNUYJPiHZW1VNDXyNVOitVaeqt6qgT7bmjcU23v8eaHeABxPmn88SSB/jJKka/FQw16deEEv2M2cj3+//DYb0wii2+tWOrLiyyxa6/ytwqmYYsIiwyrUUaUkxz0v9LqfuC1ba3ads4TuIVs9LhcroFCoROcjpliBZ8D/teJE/elJbVZQu4F0CiFojArRXwWd2EAI6d3BbkkR890u37Bzb9lJukbBWtOtAnsktcIhm1ZXETVIL9fbgqCV/7GO6ahc8oaruBhHiafhUacPwWyV5aYY7o77XpelQ==; From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH 2/2] qcow2: Convert qcow2_alloc_cluster_offset() into qcow2_alloc_host_offset() Date: Fri, 11 Sep 2020 16:09:42 +0200 Message-Id: <9bfef50ec9200d752413be4fc2aeb22a28378817.1599833007.git.berto@igalia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 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=178.60.130.6; envelope-from=berto@igalia.com; helo=fanzine.igalia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/11 10:09:56 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x (no timestamps) [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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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 , Alberto Garcia , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" qcow2_alloc_cluster_offset() takes an (unaligned) guest offset and returns the (aligned) offset of the corresponding cluster in the qcow2 image. In practice none of the callers need to know where the cluster starts so this patch makes the function calculate and return the final host offset directly. The function is also renamed accordingly. See 388e581615 for a similar change to qcow2_get_cluster_offset(). Signed-off-by: Alberto Garcia Reviewed-by: Max Reitz --- block/qcow2.h | 6 +++--- block/qcow2-cluster.c | 14 ++++++++++---- block/qcow2.c | 36 +++++++++++++----------------------- 3 files changed, 26 insertions(+), 30 deletions(-) diff --git a/block/qcow2.h b/block/qcow2.h index b73a4cf1f8..b71e444fca 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -901,9 +901,9 @@ int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t se= ctor_num, int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset, unsigned int *bytes, uint64_t *host_offset, QCow2SubclusterType *subcluster_type); -int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, - unsigned int *bytes, uint64_t *host_offset, - QCowL2Meta **m); +int qcow2_alloc_host_offset(BlockDriverState *bs, uint64_t offset, + unsigned int *bytes, uint64_t *host_offset, + QCowL2Meta **m); int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, uint64_t offset, int compressed_size, diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 1a67b2d928..9acc6ce4ae 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1719,6 +1719,10 @@ out: * clusters (or subclusters) if necessary. The result can span a * combination of allocated and previously unallocated clusters. * + * Note that offset may not be cluster aligned. In this case, the returned + * *host_offset points to exact byte referenced by offset and therefore + * isn't cluster aligned as well. + * * On return, @host_offset is set to the beginning of the requested * area. This area is guaranteed to be contiguous on the qcow2 file * but it can be smaller than initially requested. In this case @bytes @@ -1736,9 +1740,9 @@ out: * * Return 0 on success and -errno in error cases */ -int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, - unsigned int *bytes, uint64_t *host_offset, - QCowL2Meta **m) +int qcow2_alloc_host_offset(BlockDriverState *bs, uint64_t offset, + unsigned int *bytes, uint64_t *host_offset, + QCowL2Meta **m) { BDRVQcow2State *s =3D bs->opaque; uint64_t start, remaining; @@ -1759,7 +1763,7 @@ again: while (true) { =20 if (*host_offset =3D=3D INV_OFFSET && cluster_offset !=3D INV_OFFS= ET) { - *host_offset =3D start_of_cluster(s, cluster_offset); + *host_offset =3D cluster_offset; } =20 assert(remaining >=3D cur_bytes); @@ -1842,6 +1846,8 @@ again: *bytes -=3D remaining; assert(*bytes > 0); assert(*host_offset !=3D INV_OFFSET); + assert(offset_into_cluster(s, *host_offset) =3D=3D + offset_into_cluster(s, offset)); =20 return 0; } diff --git a/block/qcow2.c b/block/qcow2.c index 1cb5daf39a..b05512718c 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2559,7 +2559,7 @@ static coroutine_fn int qcow2_co_pwritev_part( int offset_in_cluster; int ret; unsigned int cur_bytes; /* number of sectors in current iteration */ - uint64_t cluster_offset; + uint64_t host_offset; QCowL2Meta *l2meta =3D NULL; AioTaskPool *aio =3D NULL; =20 @@ -2580,16 +2580,13 @@ static coroutine_fn int qcow2_co_pwritev_part( =20 qemu_co_mutex_lock(&s->lock); =20 - ret =3D qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, - &cluster_offset, &l2meta); + ret =3D qcow2_alloc_host_offset(bs, offset, &cur_bytes, + &host_offset, &l2meta); if (ret < 0) { goto out_locked; } =20 - assert(offset_into_cluster(s, cluster_offset) =3D=3D 0); - - ret =3D qcow2_pre_write_overlap_check(bs, 0, - cluster_offset + offset_in_clu= ster, + ret =3D qcow2_pre_write_overlap_check(bs, 0, host_offset, cur_bytes, true); if (ret < 0) { goto out_locked; @@ -2601,7 +2598,7 @@ static coroutine_fn int qcow2_co_pwritev_part( aio =3D aio_task_pool_new(QCOW2_MAX_WORKERS); } ret =3D qcow2_add_task(bs, aio, qcow2_co_pwritev_task_entry, 0, - cluster_offset + offset_in_cluster, offset, + host_offset, offset, cur_bytes, qiov, qiov_offset, l2meta); l2meta =3D NULL; /* l2meta is consumed by qcow2_co_pwritev_task() = */ if (ret < 0) { @@ -3129,13 +3126,12 @@ static int coroutine_fn preallocate_co(BlockDriverS= tate *bs, uint64_t offset, =20 while (bytes) { cur_bytes =3D MIN(bytes, QEMU_ALIGN_DOWN(INT_MAX, s->cluster_size)= ); - ret =3D qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, - &host_offset, &meta); + ret =3D qcow2_alloc_host_offset(bs, offset, &cur_bytes, + &host_offset, &meta); if (ret < 0) { error_setg_errno(errp, -ret, "Allocating clusters failed"); goto out; } - host_offset +=3D offset_into_cluster(s, offset); =20 for (m =3D meta; m !=3D NULL; m =3D m->next) { m->prealloc =3D true; @@ -4043,10 +4039,9 @@ qcow2_co_copy_range_to(BlockDriverState *bs, BdrvRequestFlags write_flags) { BDRVQcow2State *s =3D bs->opaque; - int offset_in_cluster; int ret; unsigned int cur_bytes; /* number of sectors in current iteration */ - uint64_t cluster_offset; + uint64_t host_offset; QCowL2Meta *l2meta =3D NULL; =20 assert(!bs->encrypted); @@ -4057,31 +4052,26 @@ qcow2_co_copy_range_to(BlockDriverState *bs, =20 l2meta =3D NULL; =20 - offset_in_cluster =3D offset_into_cluster(s, dst_offset); cur_bytes =3D MIN(bytes, INT_MAX); =20 /* TODO: * If src->bs =3D=3D dst->bs, we could simply copy by incrementing * the refcnt, without copying user data. * Or if src->bs =3D=3D dst->bs->backing->bs, we could copy by dis= carding. */ - ret =3D qcow2_alloc_cluster_offset(bs, dst_offset, &cur_bytes, - &cluster_offset, &l2meta); + ret =3D qcow2_alloc_host_offset(bs, dst_offset, &cur_bytes, + &host_offset, &l2meta); if (ret < 0) { goto fail; } =20 - assert(offset_into_cluster(s, cluster_offset) =3D=3D 0); - - ret =3D qcow2_pre_write_overlap_check(bs, 0, - cluster_offset + offset_in_cluster, cur_bytes, true); + ret =3D qcow2_pre_write_overlap_check(bs, 0, host_offset, cur_byte= s, + true); if (ret < 0) { goto fail; } =20 qemu_co_mutex_unlock(&s->lock); - ret =3D bdrv_co_copy_range_to(src, src_offset, - s->data_file, - cluster_offset + offset_in_cluster, + ret =3D bdrv_co_copy_range_to(src, src_offset, s->data_file, host_= offset, cur_bytes, read_flags, write_flags); qemu_co_mutex_lock(&s->lock); if (ret < 0) { --=20 2.20.1