From patchwork Mon Apr 20 18:36:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 11499647 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 457C692C for ; Mon, 20 Apr 2020 18:40:00 +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 13E502074F for ; Mon, 20 Apr 2020 18:40:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 13E502074F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40676 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQbKp-0005pD-95 for patchwork-qemu-devel@patchwork.kernel.org; Mon, 20 Apr 2020 14:39:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44872 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQbI5-00016G-Qd for qemu-devel@nongnu.org; Mon, 20 Apr 2020 14:37:11 -0400 Received: from Debian-exim by eggs1p.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jQbI2-00041b-HQ for qemu-devel@nongnu.org; Mon, 20 Apr 2020 14:37:09 -0400 Received: from relay.sw.ru ([185.231.240.75]:39790) by eggs1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jQbHr-0003NJ-Q4; Mon, 20 Apr 2020 14:36:55 -0400 Received: from dhcp-172-16-25-136.sw.ru ([172.16.25.136] helo=localhost.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1jQbHk-0001xO-AS; Mon, 20 Apr 2020 21:36:48 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH 7/7] block: apply COR-filter to block-stream jobs Date: Mon, 20 Apr 2020 21:36:46 +0300 Message-Id: <1587407806-109784-8-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1587407806-109784-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1587407806-109784-1-git-send-email-andrey.shinkevich@virtuozzo.com> Received-SPF: pass client-ip=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay.sw.ru X-detected-operating-system: by eggs1p.gnu.org: First seen = 2020/04/20 14:36:51 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Received-From: 185.231.240.75 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: kwolf@redhat.com, vsementsov@virtuozzo.com, armbru@redhat.com, qemu-devel@nongnu.org, andrey.shinkevich@virtuozzo.com, den@openvz.org, mreitz@redhat.com, jsnow@redhat.com, dgilbert@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The patch completes the series with the COR-filter insertion to any block-stream operation. It also makes changes to the iotests 030, 141 and 245. Signed-off-by: Andrey Shinkevich --- block/stream.c | 151 +++++++++++++++++++++++++++++++++++++++------ tests/qemu-iotests/030 | 6 +- tests/qemu-iotests/141.out | 2 +- tests/qemu-iotests/245 | 5 +- 4 files changed, 141 insertions(+), 23 deletions(-) diff --git a/block/stream.c b/block/stream.c index fab7923..af14ba8 100644 --- a/block/stream.c +++ b/block/stream.c @@ -16,6 +16,7 @@ #include "block/block_int.h" #include "block/blockjob_int.h" #include "qapi/error.h" +#include "qapi/qmp/qdict.h" #include "qapi/qmp/qerror.h" #include "qemu/ratelimit.h" #include "sysemu/block-backend.h" @@ -33,6 +34,8 @@ typedef struct StreamBlockJob { BlockJob common; BlockDriverState *bottom_cow_node; BlockDriverState *above_base; + BlockDriverState *cor_filter_bs; + BlockDriverState *target_bs; BlockdevOnError on_error; char *backing_file_str; bool bs_read_only; @@ -46,22 +49,11 @@ static int coroutine_fn stream_populate(BlockBackend *blk, assert(bytes < SIZE_MAX); /* Copy-on-read the unallocated clusters */ - return blk_co_pread(blk, offset, bytes, buf, BDRV_REQ_COPY_ON_READ); + return blk_co_pread(blk, offset, bytes, buf, 0); } -static void stream_abort(Job *job) -{ - StreamBlockJob *s = container_of(job, StreamBlockJob, common.job); - - if (s->chain_frozen) { - BlockJob *bjob = &s->common; - bdrv_unfreeze_chain(blk_bs(bjob->blk), s->above_base); - } -} - -static int stream_prepare(Job *job) +static int stream_change_backing_file(StreamBlockJob *s) { - StreamBlockJob *s = container_of(job, StreamBlockJob, common.job); BlockJob *bjob = &s->common; BlockDriverState *bs = blk_bs(bjob->blk); BlockDriverState *unfiltered_bs = bdrv_skip_rw_filters(bs); @@ -69,9 +61,6 @@ static int stream_prepare(Job *job) Error *local_err = NULL; int ret = 0; - bdrv_unfreeze_chain(bs, s->above_base); - s->chain_frozen = false; - if (bdrv_filtered_cow_child(unfiltered_bs)) { const char *base_id = NULL, *base_fmt = NULL; if (base) { @@ -91,11 +80,58 @@ static int stream_prepare(Job *job) return ret; } +static int stream_exit(Job *job, bool abort) +{ + StreamBlockJob *s = container_of(job, StreamBlockJob, common.job); + BlockJob *bjob = &s->common; + BlockDriverState *target_bs = s->target_bs; + int ret = 0; + + if (s->chain_frozen) { + bdrv_unfreeze_chain(s->target_bs, s->bottom_cow_node); + s->chain_frozen = false; + } + + /* Retain the BDS until we complete the graph change. */ + bdrv_ref(target_bs); + /* Hold a guest back from writing while permissions are being reset. */ + bdrv_drained_begin(target_bs); + /* Drop permissions before the graph change. */ + bdrv_child_try_set_perm(bdrv_filtered_rw_child(s->cor_filter_bs), + 0, BLK_PERM_ALL, &error_abort); + if (!abort) { + ret = stream_change_backing_file(s); + } + + bdrv_replace_node(s->cor_filter_bs, target_bs, &error_abort); + /* Switch the BB back to the filter so that job terminated properly. */ + blk_remove_bs(bjob->blk); + blk_set_perm(bjob->blk, 0, BLK_PERM_ALL, &error_abort); + blk_insert_bs(bjob->blk, s->cor_filter_bs, &error_abort); + + bdrv_drained_end(target_bs); + bdrv_unref(target_bs); + /* Submit control over filter to the job instance. */ + bdrv_unref(s->cor_filter_bs); + + return ret; +} + +static int stream_prepare(Job *job) +{ + return stream_exit(job, false); +} + +static void stream_abort(Job *job) +{ + stream_exit(job, job->ret < 0); +} + static void stream_clean(Job *job) { StreamBlockJob *s = container_of(job, StreamBlockJob, common.job); BlockJob *bjob = &s->common; - BlockDriverState *bs = blk_bs(bjob->blk); + BlockDriverState *bs = s->target_bs; /* Reopen the image back in read-only mode if necessary */ if (s->bs_read_only) { @@ -212,6 +248,72 @@ static int coroutine_fn stream_run(Job *job, Error **errp) return error; } +static BlockDriverState *create_filter_node(BlockDriverState *bs, + const char *filter_node_name, + Error **errp) +{ + QDict *opts = qdict_new(); + + qdict_put_str(opts, "driver", "copy-on-read"); + qdict_put_str(opts, "file", bdrv_get_node_name(bs)); + if (filter_node_name) { + qdict_put_str(opts, "node-name", filter_node_name); + } + + return bdrv_open(NULL, NULL, opts, BDRV_O_RDWR, errp); +} + +static void remove_filter(BlockDriverState *cor_filter_bs) +{ + BdrvChild *child; + BlockDriverState *bs; + + child = bdrv_filtered_rw_child(cor_filter_bs); + if (!child) { + return; + } + bs = child->bs; + + /* Hold a guest back from writing until we remove the filter */ + bdrv_drained_begin(bs); + bdrv_child_try_set_perm(child, 0, BLK_PERM_ALL, + &error_abort); + bdrv_replace_node(cor_filter_bs, bs, &error_abort); + bdrv_drained_end(bs); + + bdrv_unref(cor_filter_bs); +} + +static BlockDriverState *insert_filter(BlockDriverState *bs, + const char *filter_node_name, + Error **errp) +{ + BlockDriverState *cor_filter_bs; + Error *local_err = NULL; + + cor_filter_bs = create_filter_node(bs, filter_node_name, errp); + if (cor_filter_bs == NULL) { + error_prepend(errp, "Could not create filter node: "); + return NULL; + } + + if (!filter_node_name) { + cor_filter_bs->implicit = true; + } + + bdrv_drained_begin(bs); + bdrv_replace_node(bs, cor_filter_bs, &local_err); + bdrv_drained_end(bs); + + if (local_err) { + bdrv_unref(cor_filter_bs); + error_propagate(errp, local_err); + return NULL; + } + + return cor_filter_bs; +} + static const BlockJobDriver stream_job_driver = { .job_driver = { .instance_size = sizeof(StreamBlockJob), @@ -237,6 +339,7 @@ void stream_start(const char *job_id, BlockDriverState *bs, BlockDriverState *iter; bool bs_read_only; int basic_flags = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; + BlockDriverState *cor_filter_bs = NULL; BlockDriverState *bottom_cow_node = bdrv_find_overlay(bs, base); BlockDriverState *above_base; @@ -267,10 +370,16 @@ void stream_start(const char *job_id, BlockDriverState *bs, } else { bdrv_unfreeze_chain(bottom_cow_node, above_base); } + + cor_filter_bs = insert_filter(bs, filter_node_name, errp); + if (cor_filter_bs == NULL) { + goto fail; + } + /* Prevent concurrent jobs trying to modify the graph structure here, we * already have our own plans. Also don't allow resize as the image size is * queried only at the job start and then cached. */ - s = block_job_create(job_id, &stream_job_driver, NULL, bs, + s = block_job_create(job_id, &stream_job_driver, NULL, cor_filter_bs, basic_flags | BLK_PERM_GRAPH_MOD, basic_flags | BLK_PERM_WRITE, speed, creation_flags, NULL, NULL, errp); @@ -294,6 +403,8 @@ void stream_start(const char *job_id, BlockDriverState *bs, basic_flags, &error_abort); } + s->cor_filter_bs = cor_filter_bs; + s->target_bs = bs; s->bottom_cow_node = bottom_cow_node; s->above_base = above_base; s->backing_file_str = g_strdup(backing_file_str); @@ -310,4 +421,8 @@ fail: bdrv_reopen_set_read_only(bs, true, NULL); } bdrv_unfreeze_chain(bs, bottom_cow_node); + + if (cor_filter_bs) { + remove_filter(cor_filter_bs); + } } diff --git a/tests/qemu-iotests/030 b/tests/qemu-iotests/030 index 1b69f31..31a5164 100755 --- a/tests/qemu-iotests/030 +++ b/tests/qemu-iotests/030 @@ -269,7 +269,9 @@ class TestParallelOps(iotests.QMPTestCase): self.assert_no_active_block_jobs() # Set a speed limit to make sure that this job blocks the rest - result = self.vm.qmp('block-stream', device='node4', job_id='stream-node4', base=self.imgs[1], speed=1024*1024) + result = self.vm.qmp('block-stream', device='node4', + job_id='stream-node4', base=self.imgs[1], + filter_node_name='stream-filter', speed=1024*1024) self.assert_qmp(result, 'return', {}) result = self.vm.qmp('block-stream', device='node5', job_id='stream-node5', base=self.imgs[2]) @@ -287,7 +289,7 @@ class TestParallelOps(iotests.QMPTestCase): # block-commit should also fail if it touches nodes used by the stream job result = self.vm.qmp('block-commit', device='drive0', base=self.imgs[4], job_id='commit-node4') self.assert_qmp(result, 'error/desc', - "Node 'node4' is busy: block device is in use by block job: stream") + "Node 'stream-filter' is busy: block device is in use by block job: stream") result = self.vm.qmp('block-commit', device='drive0', base=self.imgs[1], top=self.imgs[3], job_id='commit-node1') self.assert_qmp(result, 'error/desc', diff --git a/tests/qemu-iotests/141.out b/tests/qemu-iotests/141.out index 4d71d9d..8cc020f 100644 --- a/tests/qemu-iotests/141.out +++ b/tests/qemu-iotests/141.out @@ -78,7 +78,7 @@ wrote 1048576/1048576 bytes at offset 0 {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "created", "id": "job0"}} {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "running", "id": "job0"}} {"return": {}} -{"error": {"class": "GenericError", "desc": "Node drv0 is in use"}} +{"error": {"class": "GenericError", "desc": "Node 'drv0' is busy: block device is in use by block job: stream"}} {"return": {}} {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "aborting", "id": "job0"}} {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "BLOCK_JOB_CANCELLED", "data": {"device": "job0", "len": 1048576, "offset": 524288, "speed": 1, "type": "stream"}} diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245 index 9baeb2b..18839dc 100644 --- a/tests/qemu-iotests/245 +++ b/tests/qemu-iotests/245 @@ -907,10 +907,11 @@ class TestBlockdevReopen(iotests.QMPTestCase): opts['backing'] = None self.reopen(opts, {'read-only': False}, "Cannot change 'backing' link from 'hd1' to 'hd2'") - # We can detach hd1 from hd0 because it doesn't affect the stream job + # We can't detach hd1 from hd0 while the stream job is ongoing opts = hd_opts(0) opts['backing'] = None - self.reopen(opts) + self.reopen(opts, {}, + "Cannot change backing link if 'hd0' has an implicit backing file") self.vm.run_job('stream0', auto_finalize = False, auto_dismiss = True)