From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 851C2C4360C for ; Thu, 10 Oct 2019 12:10:38 +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 5A6DC20650 for ; Thu, 10 Oct 2019 12:10:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A6DC20650 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]:36958 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIXHA-000333-Vy for qemu-devel@archiver.kernel.org; Thu, 10 Oct 2019 08:10:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51593) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIWqh-0006E7-EV for qemu-devel@nongnu.org; Thu, 10 Oct 2019 07:43:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iIWqf-00084J-Pn for qemu-devel@nongnu.org; Thu, 10 Oct 2019 07:43:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33050) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iIWqc-00082N-As; Thu, 10 Oct 2019 07:43:10 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8AE22307D88C; Thu, 10 Oct 2019 11:43:09 +0000 (UTC) Received: from localhost (unknown [10.36.118.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 01D9E5D6A5; Thu, 10 Oct 2019 11:43:08 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PULL 03/36] block/qcow2: refactor qcow2_co_preadv_part Date: Thu, 10 Oct 2019 13:42:27 +0200 Message-Id: <20191010114300.7746-4-mreitz@redhat.com> In-Reply-To: <20191010114300.7746-1-mreitz@redhat.com> References: <20191010114300.7746-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Thu, 10 Oct 2019 11:43:09 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 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 , Peter Maydell , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Vladimir Sementsov-Ogievskiy Further patch will run partial requests of iterations of qcow2_co_preadv in parallel for performance reasons. To prepare for this, separate part which may be parallelized into separate function (qcow2_co_preadv_task). While being here, also separate encrypted clusters reading to own function, like it is done for compressed reading. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-id: 20190916175324.18478-4-vsementsov@virtuozzo.com Signed-off-by: Max Reitz --- block/qcow2.c | 209 +++++++++++++++++++++++++++----------------------- 1 file changed, 113 insertions(+), 96 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 4d16393e61..6feb169f7c 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1972,17 +1972,117 @@ out: return ret; } =20 +static coroutine_fn int +qcow2_co_preadv_encrypted(BlockDriverState *bs, + uint64_t file_cluster_offset, + uint64_t offset, + uint64_t bytes, + QEMUIOVector *qiov, + uint64_t qiov_offset) +{ + int ret; + BDRVQcow2State *s =3D bs->opaque; + uint8_t *buf; + + assert(bs->encrypted && s->crypto); + assert(bytes <=3D QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); + + /* + * For encrypted images, read everything into a temporary + * contiguous buffer on which the AES functions can work. + * Also, decryption in a separate buffer is better as it + * prevents the guest from learning information about the + * encrypted nature of the virtual disk. + */ + + buf =3D qemu_try_blockalign(s->data_file->bs, bytes); + if (buf =3D=3D NULL) { + return -ENOMEM; + } + + BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); + ret =3D bdrv_co_pread(s->data_file, + file_cluster_offset + offset_into_cluster(s, off= set), + bytes, buf, 0); + if (ret < 0) { + goto fail; + } + + assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)); + assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE)); + if (qcow2_co_decrypt(bs, + file_cluster_offset + offset_into_cluster(s, of= fset), + offset, buf, bytes) < 0) + { + ret =3D -EIO; + goto fail; + } + qemu_iovec_from_buf(qiov, qiov_offset, buf, bytes); + +fail: + qemu_vfree(buf); + + return ret; +} + +static coroutine_fn int qcow2_co_preadv_task(BlockDriverState *bs, + QCow2ClusterType cluster_ty= pe, + uint64_t file_cluster_offse= t, + uint64_t offset, uint64_t b= ytes, + QEMUIOVector *qiov, + size_t qiov_offset) +{ + BDRVQcow2State *s =3D bs->opaque; + int offset_in_cluster =3D offset_into_cluster(s, offset); + + switch (cluster_type) { + case QCOW2_CLUSTER_ZERO_PLAIN: + case QCOW2_CLUSTER_ZERO_ALLOC: + /* Both zero types are handled in qcow2_co_preadv_part */ + g_assert_not_reached(); + + case QCOW2_CLUSTER_UNALLOCATED: + assert(bs->backing); /* otherwise handled in qcow2_co_preadv_par= t */ + + BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); + return bdrv_co_preadv_part(bs->backing, offset, bytes, + qiov, qiov_offset, 0); + + case QCOW2_CLUSTER_COMPRESSED: + return qcow2_co_preadv_compressed(bs, file_cluster_offset, + offset, bytes, qiov, qiov_offs= et); + + case QCOW2_CLUSTER_NORMAL: + if ((file_cluster_offset & 511) !=3D 0) { + return -EIO; + } + + if (bs->encrypted) { + return qcow2_co_preadv_encrypted(bs, file_cluster_offset, + offset, bytes, qiov, qiov_o= ffset); + } + + BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); + return bdrv_co_preadv_part(s->data_file, + file_cluster_offset + offset_in_clust= er, + bytes, qiov, qiov_offset, 0); + + default: + g_assert_not_reached(); + } + + g_assert_not_reached(); +} + static coroutine_fn int qcow2_co_preadv_part(BlockDriverState *bs, uint64_t offset, uint64_t b= ytes, QEMUIOVector *qiov, size_t qiov_offset, int fla= gs) { BDRVQcow2State *s =3D bs->opaque; - int offset_in_cluster; int ret; unsigned int cur_bytes; /* number of bytes in current iteration */ uint64_t cluster_offset =3D 0; - uint8_t *cluster_data =3D NULL; =20 while (bytes !=3D 0) { =20 @@ -1997,112 +2097,29 @@ static coroutine_fn int qcow2_co_preadv_part(Blo= ckDriverState *bs, ret =3D qcow2_get_cluster_offset(bs, offset, &cur_bytes, &cluste= r_offset); qemu_co_mutex_unlock(&s->lock); if (ret < 0) { - goto fail; + return ret; } =20 - offset_in_cluster =3D offset_into_cluster(s, offset); - - switch (ret) { - case QCOW2_CLUSTER_UNALLOCATED: - - if (bs->backing) { - BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); - ret =3D bdrv_co_preadv_part(bs->backing, offset, cur_byt= es, - qiov, qiov_offset, 0); - if (ret < 0) { - goto fail; - } - } else { - /* Note: in this case, no need to wait */ - qemu_iovec_memset(qiov, qiov_offset, 0, cur_bytes); - } - break; - - case QCOW2_CLUSTER_ZERO_PLAIN: - case QCOW2_CLUSTER_ZERO_ALLOC: + if (ret =3D=3D QCOW2_CLUSTER_ZERO_PLAIN || + ret =3D=3D QCOW2_CLUSTER_ZERO_ALLOC || + (ret =3D=3D QCOW2_CLUSTER_UNALLOCATED && !bs->backing)) + { qemu_iovec_memset(qiov, qiov_offset, 0, cur_bytes); - break; - - case QCOW2_CLUSTER_COMPRESSED: - ret =3D qcow2_co_preadv_compressed(bs, cluster_offset, - offset, cur_bytes, - qiov, qiov_offset); + } else { + ret =3D qcow2_co_preadv_task(bs, ret, + cluster_offset, offset, cur_bytes= , + qiov, qiov_offset); if (ret < 0) { - goto fail; - } - - break; - - case QCOW2_CLUSTER_NORMAL: - if ((cluster_offset & 511) !=3D 0) { - ret =3D -EIO; - goto fail; - } - - if (bs->encrypted) { - assert(s->crypto); - - /* - * For encrypted images, read everything into a temporar= y - * contiguous buffer on which the AES functions can work= . - */ - if (!cluster_data) { - cluster_data =3D - qemu_try_blockalign(s->data_file->bs, - QCOW_MAX_CRYPT_CLUSTERS - * s->cluster_size); - if (cluster_data =3D=3D NULL) { - ret =3D -ENOMEM; - goto fail; - } - } - - assert(cur_bytes <=3D QCOW_MAX_CRYPT_CLUSTERS * s->clust= er_size); - - BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); - ret =3D bdrv_co_pread(s->data_file, - cluster_offset + offset_in_cluster, - cur_bytes, cluster_data, 0); - if (ret < 0) { - goto fail; - } - - assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)); - assert(QEMU_IS_ALIGNED(cur_bytes, BDRV_SECTOR_SIZE)); - if (qcow2_co_decrypt(bs, cluster_offset + offset_in_clus= ter, - offset, - cluster_data, cur_bytes) < 0) { - ret =3D -EIO; - goto fail; - } - qemu_iovec_from_buf(qiov, qiov_offset, cluster_data, cur= _bytes); - } else { - BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); - ret =3D bdrv_co_preadv_part(s->data_file, - cluster_offset + offset_in_clu= ster, - cur_bytes, qiov, qiov_offset, = 0); - if (ret < 0) { - goto fail; - } + return ret; } - break; - - default: - g_assert_not_reached(); - ret =3D -EIO; - goto fail; } =20 bytes -=3D cur_bytes; offset +=3D cur_bytes; qiov_offset +=3D cur_bytes; } - ret =3D 0; - -fail: - qemu_vfree(cluster_data); =20 - return ret; + return 0; } =20 /* Check if it's possible to merge a write request with the writing of --=20 2.21.0