From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 967DE42A788; Thu, 23 Jul 2026 09:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.177.32 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784799440; cv=fail; b=MVoPRD1QBBGQacVle/zo+FGqt5MgwgYXQ9dHu/6aq/jWZBXBVGN0Chr7zvC/uL0911tjtIh7ZFq1ypr4DUOwfk+IFzsixEUUb3MeL3e1GpwFYAKbfvOnwo9TbRL0nsBVEhdyk9k/2z/AOlPxEXQrILyxy1fIYDvqgx1vUIEPhe0= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784799440; c=relaxed/simple; bh=6rdmxMeECp678pI5yuTHOdVmDuMs0QA58leHz9ItR+0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=Vwt+/yySjTB0A1cMMzjJtZTHbcUCxt3wYL/sKODYEtcPmhauJfiKEBUcdHhjd/fgW3zimmi5mNLQZWsUGJ6bQ0b7/OYz/VKVhJUSamg/dZqDO2R344DzajJ86lU4DRMYVlOtYka9MFR5XFVqe1RCjWBMx6/M0a6kW29c3dbFw4M= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=QijBaa+t; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=CqKeZ4za; arc=fail smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="QijBaa+t"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="CqKeZ4za" Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 66MJtl2w3378008; Thu, 23 Jul 2026 09:36:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2025-04-25; bh=0cnZQpy5/yiwLPQ6XRScRSBdQlV0F+Oot/KnLV8hd8I=; b= QijBaa+t3/DUXV5PAVLXRmUH4uEHjU1HJ93eza03fiW+x8k6G+o/uMphSL44lkMv GQpCJlJRJboUijmmQLolJvlydj2+Z7L97ogEKkQsL0ad2xkN2IkgPH4DPc0Z2Jis 1Hd88N6u0Vd35QaUicIwgkR38KXVIOZlctYteYeV9qcs1d7EYrCx1WqS8ojwo1mD QLzHmmNfN1FOsBNXDiyiPJkN3H5IWWhoUbZSo7MkBGmpX2JwmlMAZ8nhIh/81NoI MiCorDwYydB/o4kkRIJ87lDEDgYFIzpIvIF/2aKixqWMAtoKio4Vm386OvxM8zV3 I5m8Arq3XZmgssDkTHK5rg== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4fg1mv6na0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 23 Jul 2026 09:36:56 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.7/8.18.1.7) with ESMTP id 66N9XA6Q021265; Thu, 23 Jul 2026 09:36:55 GMT Received: from bn8pr05cu002.outbound.protection.outlook.com (mail-eastus2azon11011062.outbound.protection.outlook.com [52.101.57.62]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 4fgts0y3vu-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Jul 2026 09:36:54 +0000 (GMT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=MA6MMCUfMjdwf8Mqoj+oRz7OLpGLWN05kswT3w+nrBjjsoTRT1S1/cQYlnKtB26SON2PcCQNks5jCzSoPYmnskwQPDIzCOtOQVBiWlfgHYZ0EOHpbTJ89TW7jONY8omhTg7WU5e1fOZzee2FjJnfEhPuVf1i3sbqXzfmQp0UzQ4GuQo77/P+QpW0IIUyBrwEOye80THi8zjMTyqZbiKDD8oUnDFLdC2Oq3IArfHw8cpCnj312GJ24EsetpQKBoeW32doL2caSaQ4cOEYbXH+oiA56Z8sNi2wIp/3tUeTbuLFWEIQ6MQoOkfMDCiI3cZsfLUJeEWQFtVfxjF1FXHA3Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=0cnZQpy5/yiwLPQ6XRScRSBdQlV0F+Oot/KnLV8hd8I=; b=oIU48/wLT4QrFiwdSlJUU+MgPAYaYsopmgOvtzzQa1Le3WM/3JyC4bsEubImuWLovIbSZauBGwc8SxkJxN+GKLHRl8jCHyyMxuy8Ma4vty6tTzJ38LVXyrRZjPdesU6oYqxB1Qk1MhvDY5IhVXYH4F2qU7SF0QmOhQqqfWFdRxogHPp+TG6dGO4o/hcoCbbbp0TdQiKDGC9y+EpN38UCm5qtP6kEse4NHIPKYeP7IDIqR8bHOxnn4Ij9R6UJMsJqBR0644UpF2yAwaz8yBzfvy5+BVMpq0GedLfD0MoReiVHRlwLSuw18Rs0hSv4aHWILoZwDIxStki8OaQc8tL80Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=0cnZQpy5/yiwLPQ6XRScRSBdQlV0F+Oot/KnLV8hd8I=; b=CqKeZ4zaTEbAAvg2kl8rG0TOvFSJAmELvrPC5eYoglBG4W5HGsii88HWl69w+i/Q310XpeFYIRb09RfCsfsoce6z3QU4Cvi6YUulh2ewLvedIa4QVvt16P+/0ZkPNx0j6PdK1SjJ3sLmKDYbbSHlUCzUXbfsC5+vzh+NNkNCqVk= Received: from DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) by PH0PR10MB4678.namprd10.prod.outlook.com (2603:10b6:510:3b::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.245.10; Thu, 23 Jul 2026 09:36:51 +0000 Received: from DM4PR10MB6229.namprd10.prod.outlook.com ([fe80::867:63e7:13fa:fa7d]) by DM4PR10MB6229.namprd10.prod.outlook.com ([fe80::867:63e7:13fa:fa7d%6]) with mapi id 15.21.0245.009; Thu, 23 Jul 2026 09:36:51 +0000 From: John Garry To: martin.petersen@oracle.com, james.bottomley@hansenpartnership.com, hare@suse.com Cc: jmeneghi@redhat.com, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, michael.christie@oracle.com, snitzer@kernel.org, bmarzins@redhat.com, dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, nilay@linux.ibm.com, john.garry@linux.dev, hch@lst.de, kbusch@kernel.org, sagi@grimberg.me, John Garry Subject: [PATCH v4 02/28] libmultipath: Add basic gendisk support Date: Thu, 23 Jul 2026 09:36:00 +0000 Message-ID: <20260723093627.2327456-3-john.g.garry@oracle.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260723093627.2327456-1-john.g.garry@oracle.com> References: <20260723093627.2327456-1-john.g.garry@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SJ0PR03CA0185.namprd03.prod.outlook.com (2603:10b6:a03:2ef::10) To DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB6229:EE_|PH0PR10MB4678:EE_ X-MS-Office365-Filtering-Correlation-Id: 7a33fcc6-5f18-486a-bbfb-08dee89dec88 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|23010399003|376014|22082099003|18002099003|10067099003|56012099006; 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:DM4PR10MB6229.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(7416014)(23010399003)(376014)(22082099003)(18002099003)(10067099003)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?WtK+9JayW1kTw1gLsBfbs43WY6X4SXmmR8ZilSTVqE1TIj+GfpJrE//yZvkn?= =?us-ascii?Q?aOyHa994tWYHJ1zc0c75UMbT5x+74h92z8AiEcJmUP75Y7gO+LqCF2DT5Wa1?= =?us-ascii?Q?liIkQBH23qo7y8mtI2icOR1OlxOViZHtPQPvPRp9lTjatlRS7uqx9g4lGazi?= =?us-ascii?Q?mNB9AV+bUuhXGyIZaoT+FX22Fp+dKwobiI5mnkhs6zRY81qDIB46BPN/6cEw?= =?us-ascii?Q?552bPDlkbltTozrKRMCNQXHLRTzmb5yBSDMIvu0hlgRBe8vFK4W0ritqaj+F?= =?us-ascii?Q?beHlbK9RX+T2gelKFu0o25M6IxJBbFaSY/vTZceMOpdcnAKwC2uKJPCMqBWO?= =?us-ascii?Q?X5Exy8V6DUHX7xd7Nvw4FiTqCAdsPPYY3Uu+d7rxIFIEMKxIZa1pJ+oinoKX?= =?us-ascii?Q?USTqywqAQ8IVLyrgSAZn2c7m/Dyq30wsqbPP0dvI/OtVPcLtTxrYW/eQV0Rr?= =?us-ascii?Q?hiVl2OEFZ+0WKfY803/0oqDCwveq4q95PyG16ZEFly4YfZDxtt3BwODP47E3?= =?us-ascii?Q?SGI/mTqurGUSSu8jsKvMlMxvEqcI2PZ4feCp6Ab2y7PAlZEX47eEAUNFnJGN?= =?us-ascii?Q?qUnIGpgdwIg3vUeNCPDflvYpz5ET2lbVcl1FQMbm3FgH5z0Czj1Qt/vH2Cel?= =?us-ascii?Q?D27F4JypBFHgwAeouLPUhqdQImVsKlXgDzAchIU6vZn2WB5rJLjpggxwb7u8?= =?us-ascii?Q?X1xdEy1KgIQAepYY0Kb96GiwbAIpb6mkwhj9LzBX+qGFyIe4RG/IxKTDejZl?= =?us-ascii?Q?68nlos2IDFv8aX1ATePhUuEGtpKoEYyiSb5kawMEqUn782ArQTvV8+fzzqe8?= =?us-ascii?Q?KtTutP6KUmqv6xtPCgSCOcrsqaotMS2JXYiePbkVgF0152XEBv1CiaiGLpvi?= =?us-ascii?Q?MOHTOzfyc5HR32Y/cI1J2FFSspn5+a1t4bVkjeDREg8WsqfkIBKzLOlUYjGY?= =?us-ascii?Q?s+cLvV+wwvGFmsuR/xcDzBfJu7Dkum9a3lPZdQ7DitisaSpQf1hYQMU+Ie1s?= =?us-ascii?Q?/AkzGhJdTPRr9R0nfMSBhGpeye3YLmVpNmxceQ9b0464PPaJ8Glk7ClzlFBI?= =?us-ascii?Q?WLFmxU5aRLD4iB94m9ZudxZvkyjrOFNoVViF9TDJev4vr7itOFPwadzfuoGk?= =?us-ascii?Q?9HhxmtM2EuyuSUu+KkVcaZXZhnGBglqWiJSlwnQRwpmG7zMWUF3xdlVGz6jH?= =?us-ascii?Q?BpmPgS0uhVrQqnKJBzq0JIovsf0KlS7fm7lFFSwcDv0eUayNkGw0JS3rntSN?= =?us-ascii?Q?D/vOXW++aW6X34Ul87Byc0YR8+4NUdtbcsn/EOF7Cs+Ze7xcinvC6+LX0bhB?= =?us-ascii?Q?br3qd9ter/g2zJYIF4505tGfJFywNgaZHl+XfAqTEabigXNxSKL8pce7boav?= =?us-ascii?Q?/ci9hidAJ3mAJIqu3belJByezXC8Dk64A8ddDf4f0bW0CjY2O3J0m6wDG2Je?= =?us-ascii?Q?RQ3/DzgCjCjHZQTZffYQ+X1xm6cmNT4Pf5dzB1OcqMIsUkjnWOkrhRwzw2q7?= =?us-ascii?Q?hHzNxcgcb2mctPKT/mIX+kBSEVoVvwm+9HU4eN6nLCLSx8sdNDNC6hulgmD5?= =?us-ascii?Q?TtiSKFEdtAvDzHqoGngB7MNjx2EMe5iRbcTtE5b01Yg4u45YxRiS5g+8nfVr?= =?us-ascii?Q?QfbQvAx1RcOvVA96WdOhQlthZdAAHJLetG2WkzOJUdsbydQ2cnLuaaq2Oa6z?= =?us-ascii?Q?tCUA83QAPscUwjSZGpP9ZpkUBPlpN/Vn1zhvrNiKJOn2mXEDF+YGcc7g8Z69?= =?us-ascii?Q?P/rxd5lt4A=3D=3D?= X-Exchange-RoutingPolicyChecked: DZvsoJw9g+ADOOIfT/IUXvQC8jlDxxyDUZg81gxzCHbLY0QrQFen8kODERpEkabal6uByx3/++EnRk0QAoopDy8dZV7bo/3qMlSXJCsnGBq5vhHpOBXMI6F1jCq9PGWUYfVQbBiutn7csWLkWevssbhbiJpwecTPVRiwD4xkfUuUgXEnyN/uDcOYbTIHAT3x+ZgtHpuy2VehVv5JpnBkPWAYYdSBNTSYfegbgY3A9ihiS1e/gmETdIVs88tyl1OTjFc/sCioiq+7R5UgzCBSsxoa5LYsl870Nfzpa0hgJ8yUfwg05ZLG+0R+Dz9/5UMUF5lsRnp7vQ87AQME0MBKZw== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7a33fcc6-5f18-486a-bbfb-08dee89dec88 X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB6229.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 09:36:51.1978 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: D2pDgfftcznWrUTD8BjHcVbSNdMfZfYswCwxfUyvOwFw7WVAhG81zW4pWefHAMANmWfrmNlG0txoskxj2ms4Aw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR10MB4678 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-23_03,2026-07-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2606160000 definitions=main-2607230094 X-Proofpoint-GUID: 4ZvaU-IAGkYuHuFR7hQ5gYmfmOWE4t4D X-Proofpoint-ORIG-GUID: 4ZvaU-IAGkYuHuFR7hQ5gYmfmOWE4t4D X-Authority-Analysis: v=2.4 cv=IsYutr/g c=1 sm=1 tr=0 ts=6a61e0b8 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=RAioF0-LDSMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=3I1J8UUJPc9JN9BFgKH3:22 a=yPCof4ZbAAAA:8 a=B52eoxIPv8yZRAGToxQA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIzMDA5NSBTYWx0ZWRfX4fChoQkOAruf LxxKzj7FtWla3nEnUbB0e0fXgvbXJ6EEzqDW0OkueND6RtX8Rss6OxX9ezKFw3Fv8cb6BdMG1cT BBQ+89oPBJQdvqJnkWYMPhDR86WEUpyCmzUGn5XMqoQHNmxKz+c3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIzMDA5NSBTYWx0ZWRfX11n2Uutd51sM 7T3l5MCqHCfRAf9wMFoWtEovW8XG7COCp+BFiJjMfKlkmDWzSaHWe5UrAUHU3LsOeYML6jL1MpK EwPNa7gisHMGSuO1nNmwZRosiyXqACk4qLGmb7txK6gjvtCp66NqG7Q3IoOvz/xuUmS63B0Ht5b /tLQ28cEMvqwOZHBs0dZYIFtS5Mxevk1O9iHLPTNRRR3C4XjRHEpG2Sco7so8xaQBIee4lmEMbP VaFAyGlung+Pvb2beqiOnoGfoY/LNty5Z6YoiwJJzWOh2l2TBqX4JIZw60fNFhfcsHywxuB/mwF cEdKrKDi/xJbJHtFbzi701K09oGxOau90IVN3LM11Avv0feNY39cEobh5QRe3mq/oPl5Tb3Orbe DF07ULrgUFx+FaWVkxiIYc2HdObX4VM3+HigkUU0rGcQE4+oMWc3zr6/YuG1RJS7x1BIHzQx8dj IUrIFz5HVXbEI6a7Unw== Add support to allocate and free a multipath gendisk. NVMe has almost like-for-like equivalents here: - mpath_alloc_head_disk() -> nvme_mpath_alloc_disk() - multipath_partition_scan_work() -> nvme_partition_scan_work() - mpath_remove_disk() -> nvme_remove_head() - mpath_device_set_live() -> nvme_mpath_set_live() struct mpath_head_template is introduced as a method for drivers to provide custom multipath functionality. Signed-off-by: John Garry --- include/linux/multipath.h | 38 +++++++++++++++ lib/multipath.c | 99 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 137 insertions(+) diff --git a/include/linux/multipath.h b/include/linux/multipath.h index e98b4b241020a..ca8589d5cd8b2 100644 --- a/include/linux/multipath.h +++ b/include/linux/multipath.h @@ -5,11 +5,19 @@ #include #include +extern const struct block_device_operations mpath_ops; + struct mpath_device { + struct mpath_head *mpath_head; struct list_head siblings; struct gendisk *disk; }; +struct mpath_head_template { +}; + +#define MPATH_HEAD_DISK_LIVE 0 + struct mpath_head { struct srcu_struct srcu; struct list_head dev_list; /* list of all mpath_devs */ @@ -17,12 +25,42 @@ struct mpath_head { refcount_t refcount; + unsigned long flags; + struct gendisk *disk; + struct work_struct partition_scan_work; + struct device *parent; + const struct attribute_group **disk_groups; + const struct mpath_head_template *mpdt; struct mpath_device __rcu *current_path[MAX_NUMNODES]; }; +static inline struct mpath_head *mpath_bd_device_to_head(struct device *dev) +{ + return dev_get_drvdata(dev); +} + +static inline struct mpath_head *mpath_gendisk_to_head(struct gendisk *disk) +{ + return mpath_bd_device_to_head(disk_to_dev(disk)); +} + int mpath_get_head(struct mpath_head *mpath_head); void mpath_put_head(struct mpath_head *mpath_head); int mpath_head_init(struct mpath_head *mpath_head); void mpath_head_uninit(struct mpath_head *mpath_head); +void mpath_put_disk(struct mpath_head *mpath_head); +void mpath_remove_disk(struct mpath_head *mpath_head); +int mpath_alloc_head_disk(struct mpath_head *mpath_head, + struct queue_limits *lim, int numa_node); +void mpath_device_set_live(struct mpath_device *mpath_device); + +static inline bool is_mpath_disk(struct gendisk *disk) +{ + #if IS_ENABLED(CONFIG_LIBMULTIPATH) + return disk->fops == &mpath_ops; + #else + return false; + #endif +} #endif // _LIBMULTIPATH_H diff --git a/lib/multipath.c b/lib/multipath.c index 9cc398d266adf..916d01a285284 100644 --- a/lib/multipath.c +++ b/lib/multipath.c @@ -35,6 +35,102 @@ void mpath_head_uninit(struct mpath_head *mpath_head) } EXPORT_SYMBOL_GPL(mpath_head_uninit); +static int mpath_bdev_open(struct gendisk *disk, blk_mode_t mode) +{ + struct mpath_head *mpath_head = disk->private_data; + + return mpath_get_head(mpath_head); +} + +static void mpath_bdev_release(struct gendisk *disk) +{ + struct mpath_head *mpath_head = disk->private_data; + + mpath_put_head(mpath_head); +} + +const struct block_device_operations mpath_ops = { + .owner = THIS_MODULE, + .open = mpath_bdev_open, + .release = mpath_bdev_release, +}; +EXPORT_SYMBOL_GPL(mpath_ops); + +static void multipath_partition_scan_work(struct work_struct *work) +{ + struct mpath_head *mpath_head = + container_of(work, struct mpath_head, partition_scan_work); + + if (WARN_ON_ONCE(!test_and_clear_bit(GD_SUPPRESS_PART_SCAN, + &mpath_head->disk->state))) + return; + + mutex_lock(&mpath_head->disk->open_mutex); + bdev_disk_changed(mpath_head->disk, false); + mutex_unlock(&mpath_head->disk->open_mutex); +} + +void mpath_remove_disk(struct mpath_head *mpath_head) +{ + if (test_and_clear_bit(MPATH_HEAD_DISK_LIVE, &mpath_head->flags)) { + struct gendisk *disk = mpath_head->disk; + + del_gendisk(disk); + } +} +EXPORT_SYMBOL_GPL(mpath_remove_disk); + +void mpath_put_disk(struct mpath_head *mpath_head) +{ + if (!mpath_head->disk) + return; + + /* make sure all pending bios are cleaned up */ + flush_work(&mpath_head->partition_scan_work); + put_disk(mpath_head->disk); +} +EXPORT_SYMBOL_GPL(mpath_put_disk); + +int mpath_alloc_head_disk(struct mpath_head *mpath_head, + struct queue_limits *lim, int numa_node) +{ + if (!mpath_head->disk_groups || !mpath_head->parent) + return -EINVAL; + + mpath_head->disk = blk_alloc_disk(lim, numa_node); + if (IS_ERR(mpath_head->disk)) + return PTR_ERR(mpath_head->disk); + + mpath_head->disk->private_data = mpath_head; + mpath_head->disk->fops = &mpath_ops; + + set_bit(GD_SUPPRESS_PART_SCAN, &mpath_head->disk->state); + + return 0; +} +EXPORT_SYMBOL_GPL(mpath_alloc_head_disk); + +void mpath_device_set_live(struct mpath_device *mpath_device) +{ + struct mpath_head *mpath_head = mpath_device->mpath_head; + int ret; + + if (!mpath_head->disk) + return; + + if (!test_and_set_bit(MPATH_HEAD_DISK_LIVE, &mpath_head->flags)) { + dev_set_drvdata(disk_to_dev(mpath_head->disk), mpath_head); + ret = device_add_disk(mpath_head->parent, mpath_head->disk, + mpath_head->disk_groups); + if (ret) { + clear_bit(MPATH_HEAD_DISK_LIVE, &mpath_head->flags); + return; + } + queue_work(mpath_wq, &mpath_head->partition_scan_work); + } +} +EXPORT_SYMBOL_GPL(mpath_device_set_live); + int mpath_head_init(struct mpath_head *mpath_head) { memset(mpath_head, 0, sizeof(*mpath_head)); @@ -42,6 +138,9 @@ int mpath_head_init(struct mpath_head *mpath_head) mutex_init(&mpath_head->lock); refcount_set(&mpath_head->refcount, 1); + INIT_WORK(&mpath_head->partition_scan_work, + multipath_partition_scan_work); + return init_srcu_struct(&mpath_head->srcu); } EXPORT_SYMBOL_GPL(mpath_head_init); -- 2.43.7