From patchwork Sun May 24 14:51:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 1296875 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=igalia.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=igalia.com header.i=@igalia.com header.a=rsa-sha256 header.s=20170329 header.b=Yo4hILVT; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 49VNlX28qDz9sRW for ; Mon, 25 May 2020 01:03:36 +1000 (AEST) Received: from localhost ([::1]:32904 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jcsA1-0005B0-Uo for incoming@patchwork.ozlabs.org; Sun, 24 May 2020 11:03:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45854) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jcs00-000319-Bg; Sun, 24 May 2020 10:53:12 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:37965) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jcrzy-0002lV-0D; Sun, 24 May 2020 10:53:11 -0400 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=RVCbFs9i2wvpVbK9/MuPeRZS+QCNgjTqEUCxwaNf3JQ=; b=Yo4hILVTVEfgNYu2m4Jumql6y9Qxf74Dh+w5GKGSfekx810p5D4AVguDvxZ76k3GR0OPbBg110/8uQDXfRleBRfNMJGt4EtsFad5td/0SzQ3qM2ujqKkCDGKC+XeK6Yrwq94IheOwxPmEh384bqf2c4JaVBeXIOMzumu2fMt/r1RtmBzAmRISAxJpuimHLNXhIowq3HDPbUv13lI5gwA4hDA7tOP7Hm9FJI+I7Ab3+vVtPeobqXtlktDRzW/fX/B36XJyTSoucCR+asNgBBvx03nzFXoA3RGewjvMc7FGE+LfHZypZ6zGvCTN/V3j4zM58mB+B9/rK/HpqMv4qsl9Q==; Received: from [81.0.38.199] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1jcrzF-0007GQ-LY; Sun, 24 May 2020 16:52:25 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1jcryv-0005KW-5U; Sun, 24 May 2020 16:52:05 +0200 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v6 17/32] qcow2: Add cluster type parameter to qcow2_get_host_offset() Date: Sun, 24 May 2020 16:51:37 +0200 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 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 = 2020/05/24 10:52:20 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_PASS=-0.001, URIBL_BLOCKED=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 , Alberto Garcia , qemu-block@nongnu.org, Derek Su , Max Reitz Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This function returns an integer that can be either an error code or a cluster type (a value from the QCow2ClusterType enum). We are going to start using subcluster types instead of cluster types in some functions so it's better to use the exact data types instead of integers for clarity and in order to detect errors more easily. This patch makes qcow2_get_host_offset() return 0 on success and puts the returned cluster type in a separate parameter. There are no semantic changes. Signed-off-by: Alberto Garcia Reviewed-by: Max Reitz Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/qcow2.h | 3 ++- block/qcow2-cluster.c | 11 +++++++---- block/qcow2.c | 37 ++++++++++++++++++++++--------------- 3 files changed, 31 insertions(+), 20 deletions(-) diff --git a/block/qcow2.h b/block/qcow2.h index ba7614e406..9cd7cbd895 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -893,7 +893,8 @@ int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num, uint8_t *buf, int nb_sectors, bool enc, Error **errp); int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset, - unsigned int *bytes, uint64_t *host_offset); + unsigned int *bytes, uint64_t *host_offset, + QCow2ClusterType *cluster_type); int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, unsigned int *bytes, uint64_t *host_offset, QCowL2Meta **m); diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 32dc6e75e3..1e5681b0c6 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -565,13 +565,14 @@ static int coroutine_fn do_perform_cow_write(BlockDriverState *bs, * * On exit, *bytes is the number of bytes starting at offset that have the same * cluster type and (if applicable) are stored contiguously in the image file. + * The cluster type is stored in *cluster_type. * Compressed clusters are always returned one by one. * - * Returns the cluster type (QCOW2_CLUSTER_*) on success, -errno in error - * cases. + * Returns 0 on success, -errno in error cases. */ int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset, - unsigned int *bytes, uint64_t *host_offset) + unsigned int *bytes, uint64_t *host_offset, + QCow2ClusterType *cluster_type) { BDRVQcow2State *s = bs->opaque; unsigned int l2_index; @@ -712,7 +713,9 @@ out: assert(bytes_available - offset_in_cluster <= UINT_MAX); *bytes = bytes_available - offset_in_cluster; - return type; + *cluster_type = type; + + return 0; fail: qcow2_cache_put(s->l2_table_cache, (void **)&l2_slice); diff --git a/block/qcow2.c b/block/qcow2.c index d4851e0e18..2806642f68 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2033,6 +2033,7 @@ static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, BDRVQcow2State *s = bs->opaque; uint64_t host_offset; unsigned int bytes; + QCow2ClusterType type; int ret, status = 0; qemu_co_mutex_lock(&s->lock); @@ -2044,7 +2045,7 @@ static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, } bytes = MIN(INT_MAX, count); - ret = qcow2_get_host_offset(bs, offset, &bytes, &host_offset); + ret = qcow2_get_host_offset(bs, offset, &bytes, &host_offset, &type); qemu_co_mutex_unlock(&s->lock); if (ret < 0) { return ret; @@ -2052,15 +2053,15 @@ static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, *pnum = bytes; - if ((ret == QCOW2_CLUSTER_NORMAL || ret == QCOW2_CLUSTER_ZERO_ALLOC) && + if ((type == QCOW2_CLUSTER_NORMAL || type == QCOW2_CLUSTER_ZERO_ALLOC) && !s->crypto) { *map = host_offset; *file = s->data_file->bs; status |= BDRV_BLOCK_OFFSET_VALID; } - if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC) { + if (type == QCOW2_CLUSTER_ZERO_PLAIN || type == QCOW2_CLUSTER_ZERO_ALLOC) { status |= BDRV_BLOCK_ZERO; - } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { + } else if (type != QCOW2_CLUSTER_UNALLOCATED) { status |= BDRV_BLOCK_DATA; } if (s->metadata_preallocation && (status & BDRV_BLOCK_DATA) && @@ -2269,6 +2270,7 @@ static coroutine_fn int qcow2_co_preadv_part(BlockDriverState *bs, int ret = 0; unsigned int cur_bytes; /* number of bytes in current iteration */ uint64_t host_offset = 0; + QCow2ClusterType type; AioTaskPool *aio = NULL; while (bytes != 0 && aio_task_pool_status(aio) == 0) { @@ -2280,22 +2282,23 @@ static coroutine_fn int qcow2_co_preadv_part(BlockDriverState *bs, } qemu_co_mutex_lock(&s->lock); - ret = qcow2_get_host_offset(bs, offset, &cur_bytes, &host_offset); + ret = qcow2_get_host_offset(bs, offset, &cur_bytes, + &host_offset, &type); qemu_co_mutex_unlock(&s->lock); if (ret < 0) { goto out; } - if (ret == QCOW2_CLUSTER_ZERO_PLAIN || - ret == QCOW2_CLUSTER_ZERO_ALLOC || - (ret == QCOW2_CLUSTER_UNALLOCATED && !bs->backing)) + if (type == QCOW2_CLUSTER_ZERO_PLAIN || + type == QCOW2_CLUSTER_ZERO_ALLOC || + (type == QCOW2_CLUSTER_UNALLOCATED && !bs->backing)) { qemu_iovec_memset(qiov, qiov_offset, 0, cur_bytes); } else { if (!aio && cur_bytes != bytes) { aio = aio_task_pool_new(QCOW2_MAX_WORKERS); } - ret = qcow2_add_task(bs, aio, qcow2_co_preadv_task_entry, ret, + ret = qcow2_add_task(bs, aio, qcow2_co_preadv_task_entry, type, host_offset, offset, cur_bytes, qiov, qiov_offset, NULL); if (ret < 0) { @@ -3841,6 +3844,7 @@ static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, if (head || tail) { uint64_t off; unsigned int nr; + QCow2ClusterType type; assert(head + bytes <= s->cluster_size); @@ -3856,10 +3860,11 @@ static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, offset = QEMU_ALIGN_DOWN(offset, s->cluster_size); bytes = s->cluster_size; nr = s->cluster_size; - ret = qcow2_get_host_offset(bs, offset, &nr, &off); - if (ret != QCOW2_CLUSTER_UNALLOCATED && - ret != QCOW2_CLUSTER_ZERO_PLAIN && - ret != QCOW2_CLUSTER_ZERO_ALLOC) { + ret = qcow2_get_host_offset(bs, offset, &nr, &off, &type); + if (ret < 0 || + (type != QCOW2_CLUSTER_UNALLOCATED && + type != QCOW2_CLUSTER_ZERO_PLAIN && + type != QCOW2_CLUSTER_ZERO_ALLOC)) { qemu_co_mutex_unlock(&s->lock); return -ENOTSUP; } @@ -3923,16 +3928,18 @@ qcow2_co_copy_range_from(BlockDriverState *bs, while (bytes != 0) { uint64_t copy_offset = 0; + QCow2ClusterType type; /* prepare next request */ cur_bytes = MIN(bytes, INT_MAX); cur_write_flags = write_flags; - ret = qcow2_get_host_offset(bs, src_offset, &cur_bytes, ©_offset); + ret = qcow2_get_host_offset(bs, src_offset, &cur_bytes, + ©_offset, &type); if (ret < 0) { goto out; } - switch (ret) { + switch (type) { case QCOW2_CLUSTER_UNALLOCATED: if (bs->backing && bs->backing->bs) { int64_t backing_length = bdrv_getlength(bs->backing->bs);