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GET /api/patches/2225811/?format=api
{ "id": 2225811, "url": "http://patchwork.ozlabs.org/api/patches/2225811/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260421161132.99878-2-kwolf@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260421161132.99878-2-kwolf@redhat.com>", "list_archive_url": null, "date": "2026-04-21T16:11:26", "name": "[1/7] blkdebug: Add 'delay-ns' option", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "810f843558da7ea04768b0591067d7314b8cfaee", "submitter": { "id": 2714, "url": "http://patchwork.ozlabs.org/api/people/2714/?format=api", "name": "Kevin Wolf", "email": "kwolf@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260421161132.99878-2-kwolf@redhat.com/mbox/", "series": [ { "id": 500847, "url": "http://patchwork.ozlabs.org/api/series/500847/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500847", "date": "2026-04-21T16:11:27", "name": "ide: Fix deadlock between TRIM and drain", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500847/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225811/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225811/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=TqPoyZi1;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0S8F0pPZz1yCv\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 02:13:33 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wFDi0-0001MS-ST; Tue, 21 Apr 2026 12:12:20 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <kwolf@redhat.com>) id 1wFDhy-0001Km-21\n for qemu-devel@nongnu.org; Tue, 21 Apr 2026 12:12:18 -0400", "from us-smtp-delivery-124.mimecast.com ([170.10.133.124])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <kwolf@redhat.com>) id 1wFDht-0000Eg-2A\n for qemu-devel@nongnu.org; Tue, 21 Apr 2026 12:12:17 -0400", "from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com\n (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by\n relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3,\n cipher=TLS_AES_256_GCM_SHA384) id us-mta-610-wArqpyo3OeKZeu5asFJLMg-1; Tue,\n 21 Apr 2026 12:12:05 -0400", "from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com\n (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS\n id E737C1800366; Tue, 21 Apr 2026 16:12:03 +0000 (UTC)", "from merkur.fritz.box (unknown [10.44.49.173])\n by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP\n id EDBA9180045E; Tue, 21 Apr 2026 16:12:01 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776787931;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=jo+ubSRf8Apw+IWgJ8yH3iKGU+qjmtNGJAAVsB8BsNg=;\n b=TqPoyZi1hgCpxA1AAZmzBaBF1PxntSO2uO3xHUhpLQWWukJuzZ+D1msHrT02Ph96Xya4me\n YZpVDRfKLryzHbxZjag1ByLQnrQcjzYVmzUOS5yWCjaVBH5coy+88XaN+SnOgH+4BR15mJ\n kYYKmDgSKaqVQiSLDovdCnDbAD/vIdg=", "X-MC-Unique": "wArqpyo3OeKZeu5asFJLMg-1", "X-Mimecast-MFC-AGG-ID": "wArqpyo3OeKZeu5asFJLMg_1776787924", "From": "Kevin Wolf <kwolf@redhat.com>", "To": "qemu-block@nongnu.org", "Cc": "kwolf@redhat.com, hreitz@redhat.com, jsnow@redhat.com,\n qemu-devel@nongnu.org, qemu-stable@nongnu.org", "Subject": "[PATCH 1/7] blkdebug: Add 'delay-ns' option", "Date": "Tue, 21 Apr 2026 18:11:26 +0200", "Message-ID": "<20260421161132.99878-2-kwolf@redhat.com>", "In-Reply-To": "<20260421161132.99878-1-kwolf@redhat.com>", "References": "<20260421161132.99878-1-kwolf@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "Received-SPF": "pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "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, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Sometimes reproducing a problem for debugging involves slow I/O, so\nlet's add something to blkdebug to make I/O slow when we need it. This\ncan be used either together with an error so that the request fails\nafter the delay, or with errno=0, which allows the request to succeed\nafter the delay.\n\nSigned-off-by: Kevin Wolf <kwolf@redhat.com>\n---\n qapi/block-core.json | 4 ++++\n block/blkdebug.c | 15 ++++++++++++++-\n 2 files changed, 18 insertions(+), 1 deletion(-)", "diff": "diff --git a/qapi/block-core.json b/qapi/block-core.json\nindex 508b081ac16..0efd51787b4 100644\n--- a/qapi/block-core.json\n+++ b/qapi/block-core.json\n@@ -3919,6 +3919,9 @@\n #\n # @errno: error identifier (errno) to be returned; defaults to EIO\n #\n+# @delay-ns: request delay before completion in nanoseconds\n+# (default: 0, since: 11.1)\n+#\n # @sector: specifies the sector index which has to be affected in\n # order to actually trigger the event; defaults to \"any sector\"\n #\n@@ -3934,6 +3937,7 @@\n '*state': 'int',\n '*iotype': 'BlkdebugIOType',\n '*errno': 'int',\n+ '*delay-ns': 'int',\n '*sector': 'int',\n '*once': 'bool',\n '*immediately': 'bool' } }\ndiff --git a/block/blkdebug.c b/block/blkdebug.c\nindex 8a4a8cb85ea..b07c67611a5 100644\n--- a/block/blkdebug.c\n+++ b/block/blkdebug.c\n@@ -95,6 +95,7 @@ typedef struct BlkdebugRule {\n int immediately;\n int once;\n int64_t offset;\n+ int64_t delay_ns;\n } inject;\n struct {\n int new_state;\n@@ -144,6 +145,10 @@ static QemuOptsList inject_error_opts = {\n .name = \"immediately\",\n .type = QEMU_OPT_BOOL,\n },\n+ {\n+ .name = \"delay-ns\",\n+ .type = QEMU_OPT_NUMBER,\n+ },\n { /* end of list */ }\n },\n };\n@@ -216,6 +221,8 @@ static int add_rule(void *opaque, QemuOpts *opts, Error **errp)\n rule->options.inject.once = qemu_opt_get_bool(opts, \"once\", 0);\n rule->options.inject.immediately =\n qemu_opt_get_bool(opts, \"immediately\", 0);\n+ rule->options.inject.delay_ns =\n+ qemu_opt_get_number(opts, \"delay-ns\", 0);\n sector = qemu_opt_get_number(opts, \"sector\", -1);\n rule->options.inject.offset =\n sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;\n@@ -594,6 +601,7 @@ static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset,\n BlkdebugRule *rule = NULL;\n int error;\n bool immediately;\n+ int64_t delay_ns;\n \n qemu_mutex_lock(&s->lock);\n QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {\n@@ -608,13 +616,14 @@ static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset,\n }\n }\n \n- if (!rule || !rule->options.inject.error) {\n+ if (!rule) {\n qemu_mutex_unlock(&s->lock);\n return 0;\n }\n \n immediately = rule->options.inject.immediately;\n error = rule->options.inject.error;\n+ delay_ns = rule->options.inject.delay_ns;\n \n if (rule->options.inject.once) {\n QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);\n@@ -622,6 +631,10 @@ static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset,\n }\n \n qemu_mutex_unlock(&s->lock);\n+\n+ if (delay_ns) {\n+ qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, delay_ns);\n+ }\n if (!immediately) {\n aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());\n qemu_coroutine_yield();\n", "prefixes": [ "1/7" ] }