From nobody Mon Feb 9 10:12:12 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; 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=pass (i=1 dmarc=pass fromdomain=virtuozzo.com); dmarc=pass(p=quarantine dis=none) header.from=virtuozzo.com ARC-Seal: i=2; a=rsa-sha256; t=1646336969; cv=pass; d=zohomail.com; s=zohoarc; b=bmHmSkHqFPzFG0dssGe05/rKlh+AoEYjtetzlI9OE4OQHwcSsEFGs9zydM1U9eGjAYUeBPJCxNGShTHyx+IqIkGblAYL/7Efp5vWh3k8j8NnAwpkvcGfG+Ev3dB2Sl1sMWkP5kVT6aJueSJSHYIBr+edUYuH5rAbPIFariPnCwQ= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1646336969; h=Content-Type: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=PTYxUruk2BC9BKuOqqk2NLVJaD+C49EkEw7ZvJgoBkM=; b=BDnMKjSkDj2Jy5x/tGvWzPddoX+zJHkQheaWn23s5FT2ttWmQFwbIvCsWOOsv3j7DyumvZ1GLZ8P9FWKcx6ZBd1w4LRM+FI4zCQP4/GajmRMiykBbrM9RTGxV06IEEweQ/CGYs0VAjR4tzFb42FcbMDdwnMvQxL6aXIla668oeI= ARC-Authentication-Results: i=2; mx.zohomail.com; dkim=pass; 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=pass (i=1 dmarc=pass fromdomain=virtuozzo.com); dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1646336969471681.4722172755006; Thu, 3 Mar 2022 11:49:29 -0800 (PST) Received: from localhost ([::1]:52790 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nPrS4-0004xg-6d for importer@patchew.org; Thu, 03 Mar 2022 14:49:28 -0500 Received: from eggs.gnu.org ([209.51.188.92]:39066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nPrN9-00042F-Im; Thu, 03 Mar 2022 14:44:23 -0500 Received: from [2a01:111:f400:7d00::72c] (port=28672 helo=EUR05-VI1-obe.outbound.protection.outlook.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nPrN7-0004Wu-49; Thu, 03 Mar 2022 14:44:23 -0500 Received: from AM9PR08MB6737.eurprd08.prod.outlook.com (2603:10a6:20b:304::18) by VE1PR08MB4736.eurprd08.prod.outlook.com (2603:10a6:802:a6::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5017.26; Thu, 3 Mar 2022 19:44:09 +0000 Received: from AM9PR08MB6737.eurprd08.prod.outlook.com ([fe80::4545:8e0c:19c7:2a6d]) by AM9PR08MB6737.eurprd08.prod.outlook.com ([fe80::4545:8e0c:19c7:2a6d%5]) with mapi id 15.20.5038.014; Thu, 3 Mar 2022 19:44:09 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Hdh6n1EByZo5//hsh5fj0zylEPYPPrxrlnfg72XtL04pq3Zdgxu3AUeBBPRpYTmdih9XAj8jOtyoyiJwn+iIS3Lf6cfWptQ1FodcoeoZMD9u2KK04YnrCEbMA2c2DqNvk0jbeswke3fUfztZgUeeFo6EtOVayCw73bRAYyHaSZINPUQ06d2ZXfwao3wLBS5JujNUrWsSDAtdVcBhnnZj4R6OnTjzmC2bbeZxv/4vuxFQZQB7k4j6+9S5XPQ/Tb6yf6+GQF9Gbme/Y22IHi5yOi+4FjIJan+dw09fkZf7iB1NVppDQP2skSoQae6LBBndlGvMrNaLou0oRX7zC2ev7w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=PTYxUruk2BC9BKuOqqk2NLVJaD+C49EkEw7ZvJgoBkM=; b=fNkaVz5u6iMspR5WhglxtUOozEFLKwvtLluLCitNFKfMNkwdzkRQsHOyyRP6ExyiKlNKFvtwkNHSlaIVbSzCctDygedIFo9EXNgc4cHQ5fVHrFN6Z4YB3fFTtz6jgKhW4fJ1/SlXuute+bLIkSsHwXcqeWx8NWTtfV2S7J5GeC2xX42wQSAZ4tXXz3jbSbFvGfde3WV7mrzKMndCG5QZQKBdk8FyxObYC0SVcQaoPl+34R4brKJmzViQoWS9589vQjnv9h1Lgzwxz7PAkwZkusKlgg4GwiOFxi0a1PD/UOEk5twVh1yfaEVC2mpnQ0LDACnRJV1anP7vfP91L8tdMg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=virtuozzo.com; dmarc=pass action=none header.from=virtuozzo.com; dkim=pass header.d=virtuozzo.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=virtuozzo.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=PTYxUruk2BC9BKuOqqk2NLVJaD+C49EkEw7ZvJgoBkM=; b=h3e0hdv2ukkX96XKqIXh4VuI9FD/uFLA2lhsBx6tuyuScqJBBbib7bGeF4nWKQrU24pT+k098PrTX+MP+P1SvkXuzeQcXRDK0cxpofL0APRAnPKHWQEusE0/VWx7mhlofsVxHLINMCOkA19UwqFAhJ9PwTlFj2AXDE0zl1t5G0E= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=virtuozzo.com; From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, armbru@redhat.com, fam@euphon.net, stefanha@redhat.com, eblake@redhat.com, hreitz@redhat.com, kwolf@redhat.com, vsementsov@virtuozzo.com, jsnow@redhat.com Subject: [PATCH v6 06/16] block: intoduce reqlist Date: Thu, 3 Mar 2022 20:43:39 +0100 Message-Id: <20220303194349.2304213-7-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220303194349.2304213-1-vsementsov@virtuozzo.com> References: <20220303194349.2304213-1-vsementsov@virtuozzo.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: VE1PR03CA0038.eurprd03.prod.outlook.com (2603:10a6:803:118::27) To AM9PR08MB6737.eurprd08.prod.outlook.com (2603:10a6:20b:304::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 36462020-ef95-4982-1acc-08d9fd4e2f24 X-MS-TrafficTypeDiagnostic: VE1PR08MB4736:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:AM9PR08MB6737.eurprd08.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230001)(4636009)(366004)(6506007)(6512007)(26005)(6486002)(6666004)(186003)(1076003)(2616005)(316002)(6916009)(508600001)(36756003)(4326008)(8676002)(66476007)(83380400001)(66556008)(66946007)(30864003)(86362001)(8936002)(5660300002)(52116002)(38100700002)(2906002)(38350700002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?y+9d617NGcBekDSEK4BRywZ1Ux/4GjCrWXX0hXYqMKCnZ96UJnigxrEs3Ro0?= =?us-ascii?Q?wxaWbcQ6v87xgpXj6sUZkkWKUqE6Ouh4zm6qe3u9Wsnt6vT/vN+8FgdLTVT8?= =?us-ascii?Q?ASPXfJVdWkS7EEahE5Ruvzv3e1Nhn6Q1s+QBWRE7g+bNzLN+84S3StEMAVWo?= =?us-ascii?Q?NFgXfIM3F5W+i5Xa96QFmQetb2rmQYRZUReekdVrYdo0K7tGMfUSNwEXeQsg?= =?us-ascii?Q?7enclKL3s3LtU4d/uPbDjTC9XXkfKrHkomT53HambG66z2cfbVFM2kkzY5so?= =?us-ascii?Q?Dum5mRbCRJ9hamzbcHIabCUfbRafXdP/+ZVjmeY9f8jwdAfs7eh1ObScBT4+?= =?us-ascii?Q?xtgrAtBgEJ3JYbbDb8BzYqNfEgMEA1ibv12pI4NnSnixOl3CcafrKnq65/Q8?= =?us-ascii?Q?UkaRLvFt5urXsMZDpIemc3ZOrPd0LnRTMOh50SOcUGiK0g84uXmaimnLYn+n?= =?us-ascii?Q?/tjX1XWYsz3lTDrZerUq+bxKOs+WnwBnBAGIYaMoV/XKLj3Z6yOO4CiuB6Ly?= =?us-ascii?Q?pQkB3tV8fEkkGHD2jil0q3XpskJZUlAU607EjZVFGYgXRghW86i3vRoW36B/?= =?us-ascii?Q?0MMlUHz9JIEdNG4cUYyljTq45zitP90apV5zRvvfQTYEMIBmPacAKvhfxXAx?= =?us-ascii?Q?lM5K0O8ldsmXZvqZPCeJj0PNyiwb0ISoCoYMPy/Dq67yLHn+bJxBtWW1FgD/?= =?us-ascii?Q?35vkQ7WEBa0SUApS8vcf+8pSP8cKnCblYoY1NC2K70fRaBhQX2skSfeKXPTf?= =?us-ascii?Q?ZQZcSC+V3tjlr3DQqJwC3OeHXoXs3EtK3AZFTcC4sMXhquqDJCdnn3I3SEGb?= =?us-ascii?Q?p56WmUyogmgoyrhLbxw3HjWYw3uT74vZA5Pypu+tbMTdtoMvRuNITeQSn4FZ?= =?us-ascii?Q?EXHYp1jQLqk85GCzqcKCn6n5jbEmSfJupjbgMaT2i4Y8kMhza5gQt0ReUqK0?= =?us-ascii?Q?aDbLBu3yN8M091kScCyas+CGQE+IlNWus4hZY08tuigKp8pDBgKtQqo7iUWj?= =?us-ascii?Q?0judNRwglWkln0ob6N4lDOS16HikOyAmnHYmXRwrYlIi4P9l0VF4RqsIfwoS?= =?us-ascii?Q?ec118NIAzap/HmJh+3c9gJpwiNSlrxi2lwTcZGvygJkAOWADvDAqSnOJ7aci?= =?us-ascii?Q?q9wOjvhEdtL+0j/u58iGg2oxqz9wYtNsTFatk+Ehtgw1Cf3OoA6xqx3znWgi?= =?us-ascii?Q?lmI6xzaO8vrFGTm+iifYxvpYbYhfDrXD6kcHFNClbPIoy1BoAosqsG9v8t/3?= =?us-ascii?Q?0QD76nf8ow33soyLUoVuc9C/IEE0J2svxU0hL94iAEqQdJTrobm9THi1cHRL?= =?us-ascii?Q?aavILqkJVGAOPYdmOoZ8FjbWneO0lrXcMYKyeRfriSlS35+JO4qRvPguYJkO?= =?us-ascii?Q?rOXkGNjrZplIkcXGvAYZ52vQDbfh8vwDnvzGfZqDZRfvFKA9q1xrU1UkHqMU?= =?us-ascii?Q?Bm2zfieA2WgkTGidk0BxHcuhrhlAv5lrfICJfEvxI912rGkY77EGs6khu/cS?= =?us-ascii?Q?IPfbJXE1nwUJCMOSX+99v3RxYXSFtg9X/jz+UrinSY3T49CYogfV/qNaVLU+?= =?us-ascii?Q?POCDoQ1WigJhVddENJherpX75h7Liu7MipH761ZUX6mSlMdvQCQsEaOpxryp?= =?us-ascii?Q?0Hu72I9NtAX4sMSvUgYtZaAAWnUIjnKUgFOMZ0nwyCuj4wnoU1G9EnoRvUf7?= =?us-ascii?Q?LaR/MA=3D=3D?= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-Network-Message-Id: 36462020-ef95-4982-1acc-08d9fd4e2f24 X-MS-Exchange-CrossTenant-AuthSource: AM9PR08MB6737.eurprd08.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Mar 2022 19:44:09.0901 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ezKBSEb28lQzyR4dXiwEVXIpsHcLCcV0FR7wkhuy0C/T5LVtxwQhti3iR5xuWafhQCsp1nQ5sMhoXooCJ1fh2H1wHcMDabWxdwOrLfPfUnw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB4736 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a01:111:f400:7d00::72c (failed) 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=2a01:111:f400:7d00::72c; envelope-from=vsementsov@virtuozzo.com; helo=EUR05-VI1-obe.outbound.protection.outlook.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 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, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) X-ZM-MESSAGEID: 1646336970959100001 Content-Type: text/plain; charset="utf-8" Split intersecting-requests functionality out of block-copy to be reused in copy-before-write filter. Note: while being here, fix tiny typo in MAINTAINERS. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Hanna Reitz --- include/block/reqlist.h | 67 +++++++++++++++++++++++ block/block-copy.c | 116 +++++++++++++--------------------------- block/reqlist.c | 76 ++++++++++++++++++++++++++ MAINTAINERS | 4 +- block/meson.build | 1 + 5 files changed, 184 insertions(+), 80 deletions(-) create mode 100644 include/block/reqlist.h create mode 100644 block/reqlist.c diff --git a/include/block/reqlist.h b/include/block/reqlist.h new file mode 100644 index 0000000000..0fa1eef259 --- /dev/null +++ b/include/block/reqlist.h @@ -0,0 +1,67 @@ +/* + * reqlist API + * + * Copyright (C) 2013 Proxmox Server Solutions + * Copyright (c) 2021 Virtuozzo International GmbH. + * + * Authors: + * Dietmar Maurer (dietmar@proxmox.com) + * Vladimir Sementsov-Ogievskiy + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#ifndef REQLIST_H +#define REQLIST_H + +#include "qemu/coroutine.h" + +/* + * The API is not thread-safe and shouldn't be. The struct is public to be= part + * of other structures and protected by third-party locks, see + * block/block-copy.c for example. + */ + +typedef struct BlockReq { + int64_t offset; + int64_t bytes; + + CoQueue wait_queue; /* coroutines blocked on this req */ + QLIST_ENTRY(BlockReq) list; +} BlockReq; + +typedef QLIST_HEAD(, BlockReq) BlockReqList; + +/* + * Initialize new request and add it to the list. Caller must be sure that + * there are no conflicting requests in the list. + */ +void reqlist_init_req(BlockReqList *reqs, BlockReq *req, int64_t offset, + int64_t bytes); +/* Search for request in the list intersecting with @offset/@bytes area. */ +BlockReq *reqlist_find_conflict(BlockReqList *reqs, int64_t offset, + int64_t bytes); + +/* + * If there are no intersecting requests return false. Otherwise, wait for= the + * first found intersecting request to finish and return true. + * + * @lock is passed to qemu_co_queue_wait() + * False return value proves that lock was released at no point. + */ +bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset, + int64_t bytes, CoMutex *lock); + +/* + * Shrink request and wake all waiting coroutines (maybe some of them are = not + * intersecting with shrunk request). + */ +void coroutine_fn reqlist_shrink_req(BlockReq *req, int64_t new_bytes); + +/* + * Remove request and wake all waiting coroutines. Do not release any memo= ry. + */ +void coroutine_fn reqlist_remove_req(BlockReq *req); + +#endif /* REQLIST_H */ diff --git a/block/block-copy.c b/block/block-copy.c index 0834e29b6e..ef948dccec 100644 --- a/block/block-copy.c +++ b/block/block-copy.c @@ -17,6 +17,7 @@ #include "trace.h" #include "qapi/error.h" #include "block/block-copy.h" +#include "block/reqlist.h" #include "sysemu/block-backend.h" #include "qemu/units.h" #include "qemu/coroutine.h" @@ -83,7 +84,6 @@ typedef struct BlockCopyTask { */ BlockCopyState *s; BlockCopyCallState *call_state; - int64_t offset; /* * @method can also be set again in the while loop of * block_copy_dirty_clusters(), but it is never accessed concurrently @@ -94,21 +94,17 @@ typedef struct BlockCopyTask { BlockCopyMethod method; =20 /* - * Fields whose state changes throughout the execution - * Protected by lock in BlockCopyState. + * Generally, req is protected by lock in BlockCopyState, Still req.of= fset + * is only set on task creation, so may be read concurrently after cre= ation. + * req.bytes is changed at most once, and need only protecting the cas= e of + * parallel read while updating @bytes value in block_copy_task_shrink= (). */ - CoQueue wait_queue; /* coroutines blocked on this task */ - /* - * Only protect the case of parallel read while updating @bytes - * value in block_copy_task_shrink(). - */ - int64_t bytes; - QLIST_ENTRY(BlockCopyTask) list; + BlockReq req; } BlockCopyTask; =20 static int64_t task_end(BlockCopyTask *task) { - return task->offset + task->bytes; + return task->req.offset + task->req.bytes; } =20 typedef struct BlockCopyState { @@ -136,7 +132,7 @@ typedef struct BlockCopyState { CoMutex lock; int64_t in_flight_bytes; BlockCopyMethod method; - QLIST_HEAD(, BlockCopyTask) tasks; /* All tasks from all block-copy ca= lls */ + BlockReqList reqs; QLIST_HEAD(, BlockCopyCallState) calls; /* * skip_unallocated: @@ -160,42 +156,6 @@ typedef struct BlockCopyState { RateLimit rate_limit; } BlockCopyState; =20 -/* Called with lock held */ -static BlockCopyTask *find_conflicting_task(BlockCopyState *s, - int64_t offset, int64_t bytes) -{ - BlockCopyTask *t; - - QLIST_FOREACH(t, &s->tasks, list) { - if (offset + bytes > t->offset && offset < t->offset + t->bytes) { - return t; - } - } - - return NULL; -} - -/* - * If there are no intersecting tasks return false. Otherwise, wait for the - * first found intersecting tasks to finish and return true. - * - * Called with lock held. May temporary release the lock. - * Return value of 0 proves that lock was NOT released. - */ -static bool coroutine_fn block_copy_wait_one(BlockCopyState *s, int64_t of= fset, - int64_t bytes) -{ - BlockCopyTask *task =3D find_conflicting_task(s, offset, bytes); - - if (!task) { - return false; - } - - qemu_co_queue_wait(&task->wait_queue, &s->lock); - - return true; -} - /* Called with lock held */ static int64_t block_copy_chunk_size(BlockCopyState *s) { @@ -239,7 +199,7 @@ block_copy_task_create(BlockCopyState *s, BlockCopyCall= State *call_state, bytes =3D QEMU_ALIGN_UP(bytes, s->cluster_size); =20 /* region is dirty, so no existent tasks possible in it */ - assert(!find_conflicting_task(s, offset, bytes)); + assert(!reqlist_find_conflict(&s->reqs, offset, bytes)); =20 bdrv_reset_dirty_bitmap(s->copy_bitmap, offset, bytes); s->in_flight_bytes +=3D bytes; @@ -249,12 +209,9 @@ block_copy_task_create(BlockCopyState *s, BlockCopyCal= lState *call_state, .task.func =3D block_copy_task_entry, .s =3D s, .call_state =3D call_state, - .offset =3D offset, - .bytes =3D bytes, .method =3D s->method, }; - qemu_co_queue_init(&task->wait_queue); - QLIST_INSERT_HEAD(&s->tasks, task, list); + reqlist_init_req(&s->reqs, &task->req, offset, bytes); =20 return task; } @@ -270,34 +227,34 @@ static void coroutine_fn block_copy_task_shrink(Block= CopyTask *task, int64_t new_bytes) { QEMU_LOCK_GUARD(&task->s->lock); - if (new_bytes =3D=3D task->bytes) { + if (new_bytes =3D=3D task->req.bytes) { return; } =20 - assert(new_bytes > 0 && new_bytes < task->bytes); + assert(new_bytes > 0 && new_bytes < task->req.bytes); =20 - task->s->in_flight_bytes -=3D task->bytes - new_bytes; + task->s->in_flight_bytes -=3D task->req.bytes - new_bytes; bdrv_set_dirty_bitmap(task->s->copy_bitmap, - task->offset + new_bytes, task->bytes - new_byte= s); + task->req.offset + new_bytes, + task->req.bytes - new_bytes); =20 - task->bytes =3D new_bytes; - qemu_co_queue_restart_all(&task->wait_queue); + reqlist_shrink_req(&task->req, new_bytes); } =20 static void coroutine_fn block_copy_task_end(BlockCopyTask *task, int ret) { QEMU_LOCK_GUARD(&task->s->lock); - task->s->in_flight_bytes -=3D task->bytes; + task->s->in_flight_bytes -=3D task->req.bytes; if (ret < 0) { - bdrv_set_dirty_bitmap(task->s->copy_bitmap, task->offset, task->by= tes); + bdrv_set_dirty_bitmap(task->s->copy_bitmap, task->req.offset, + task->req.bytes); } - QLIST_REMOVE(task, list); if (task->s->progress) { progress_set_remaining(task->s->progress, bdrv_get_dirty_count(task->s->copy_bitmap) + task->s->in_flight_bytes); } - qemu_co_queue_restart_all(&task->wait_queue); + reqlist_remove_req(&task->req); } =20 void block_copy_state_free(BlockCopyState *s) @@ -450,7 +407,7 @@ BlockCopyState *block_copy_state_new(BdrvChild *source,= BdrvChild *target, =20 ratelimit_init(&s->rate_limit); qemu_co_mutex_init(&s->lock); - QLIST_INIT(&s->tasks); + QLIST_INIT(&s->reqs); QLIST_INIT(&s->calls); =20 return s; @@ -483,7 +440,7 @@ static coroutine_fn int block_copy_task_run(AioTaskPool= *pool, =20 aio_task_pool_wait_slot(pool); if (aio_task_pool_status(pool) < 0) { - co_put_to_shres(task->s->mem, task->bytes); + co_put_to_shres(task->s->mem, task->req.bytes); block_copy_task_end(task, -ECANCELED); g_free(task); return -ECANCELED; @@ -596,7 +553,8 @@ static coroutine_fn int block_copy_task_entry(AioTask *= task) BlockCopyMethod method =3D t->method; int ret; =20 - ret =3D block_copy_do_copy(s, t->offset, t->bytes, &method, &error_is_= read); + ret =3D block_copy_do_copy(s, t->req.offset, t->req.bytes, &method, + &error_is_read); =20 WITH_QEMU_LOCK_GUARD(&s->lock) { if (s->method =3D=3D t->method) { @@ -609,10 +567,10 @@ static coroutine_fn int block_copy_task_entry(AioTask= *task) t->call_state->error_is_read =3D error_is_read; } } else if (s->progress) { - progress_work_done(s->progress, t->bytes); + progress_work_done(s->progress, t->req.bytes); } } - co_put_to_shres(s->mem, t->bytes); + co_put_to_shres(s->mem, t->req.bytes); block_copy_task_end(t, ret); =20 return ret; @@ -771,22 +729,22 @@ block_copy_dirty_clusters(BlockCopyCallState *call_st= ate) trace_block_copy_skip_range(s, offset, bytes); break; } - if (task->offset > offset) { - trace_block_copy_skip_range(s, offset, task->offset - offset); + if (task->req.offset > offset) { + trace_block_copy_skip_range(s, offset, task->req.offset - offs= et); } =20 found_dirty =3D true; =20 - ret =3D block_copy_block_status(s, task->offset, task->bytes, + ret =3D block_copy_block_status(s, task->req.offset, task->req.byt= es, &status_bytes); assert(ret >=3D 0); /* never fail */ - if (status_bytes < task->bytes) { + if (status_bytes < task->req.bytes) { block_copy_task_shrink(task, status_bytes); } if (qatomic_read(&s->skip_unallocated) && !(ret & BDRV_BLOCK_ALLOCATED)) { block_copy_task_end(task, 0); - trace_block_copy_skip_range(s, task->offset, task->bytes); + trace_block_copy_skip_range(s, task->req.offset, task->req.byt= es); offset =3D task_end(task); bytes =3D end - offset; g_free(task); @@ -807,11 +765,11 @@ block_copy_dirty_clusters(BlockCopyCallState *call_st= ate) } } =20 - ratelimit_calculate_delay(&s->rate_limit, task->bytes); + ratelimit_calculate_delay(&s->rate_limit, task->req.bytes); =20 - trace_block_copy_process(s, task->offset); + trace_block_copy_process(s, task->req.offset); =20 - co_get_from_shres(s->mem, task->bytes); + co_get_from_shres(s->mem, task->req.bytes); =20 offset =3D task_end(task); bytes =3D end - offset; @@ -879,8 +837,8 @@ static int coroutine_fn block_copy_common(BlockCopyCall= State *call_state) * Check that there is no task we still need to * wait to complete */ - ret =3D block_copy_wait_one(s, call_state->offset, - call_state->bytes); + ret =3D reqlist_wait_one(&s->reqs, call_state->offset, + call_state->bytes, &s->lock); if (ret =3D=3D 0) { /* * No pending tasks, but check again the bitmap in this @@ -888,7 +846,7 @@ static int coroutine_fn block_copy_common(BlockCopyCall= State *call_state) * between this and the critical section in * block_copy_dirty_clusters(). * - * block_copy_wait_one return value 0 also means that = it + * reqlist_wait_one return value 0 also means that it * didn't release the lock. So, we are still in the sa= me * critical section, not interrupted by any concurrent * access to state. diff --git a/block/reqlist.c b/block/reqlist.c new file mode 100644 index 0000000000..5e320ba649 --- /dev/null +++ b/block/reqlist.c @@ -0,0 +1,76 @@ +/* + * reqlist API + * + * Copyright (C) 2013 Proxmox Server Solutions + * Copyright (c) 2021 Virtuozzo International GmbH. + * + * Authors: + * Dietmar Maurer (dietmar@proxmox.com) + * Vladimir Sementsov-Ogievskiy + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "block/reqlist.h" + +void reqlist_init_req(BlockReqList *reqs, BlockReq *req, int64_t offset, + int64_t bytes) +{ + assert(!reqlist_find_conflict(reqs, offset, bytes)); + + *req =3D (BlockReq) { + .offset =3D offset, + .bytes =3D bytes, + }; + qemu_co_queue_init(&req->wait_queue); + QLIST_INSERT_HEAD(reqs, req, list); +} + +BlockReq *reqlist_find_conflict(BlockReqList *reqs, int64_t offset, + int64_t bytes) +{ + BlockReq *r; + + QLIST_FOREACH(r, reqs, list) { + if (offset + bytes > r->offset && offset < r->offset + r->bytes) { + return r; + } + } + + return NULL; +} + +bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset, + int64_t bytes, CoMutex *lock) +{ + BlockReq *r =3D reqlist_find_conflict(reqs, offset, bytes); + + if (!r) { + return false; + } + + qemu_co_queue_wait(&r->wait_queue, lock); + + return true; +} + +void coroutine_fn reqlist_shrink_req(BlockReq *req, int64_t new_bytes) +{ + if (new_bytes =3D=3D req->bytes) { + return; + } + + assert(new_bytes > 0 && new_bytes < req->bytes); + + req->bytes =3D new_bytes; + qemu_co_queue_restart_all(&req->wait_queue); +} + +void coroutine_fn reqlist_remove_req(BlockReq *req) +{ + QLIST_REMOVE(req, list); + qemu_co_queue_restart_all(&req->wait_queue); +} diff --git a/MAINTAINERS b/MAINTAINERS index 68adaac373..101eb50619 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2515,7 +2515,9 @@ F: block/stream.c F: block/mirror.c F: qapi/job.json F: block/block-copy.c -F: include/block/block-copy.c +F: include/block/block-copy.h +F: block/reqlist.c +F: include/block/reqlist.h F: block/copy-before-write.h F: block/copy-before-write.c F: include/block/aio_task.h diff --git a/block/meson.build b/block/meson.build index 8a1ce58c9c..41e9cc5dc3 100644 --- a/block/meson.build +++ b/block/meson.build @@ -32,6 +32,7 @@ block_ss.add(files( 'qcow2.c', 'quorum.c', 'raw-format.c', + 'reqlist.c', 'snapshot.c', 'throttle-groups.c', 'throttle.c', --=20 2.31.1