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[148.163.156.1]) by mx.google.com with ESMTPS id r185si24476581pgr.10.2019.05.22.01.28.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 May 2019 01:28:23 -0700 (PDT) Received-SPF: pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) client-ip=148.163.156.1; Authentication-Results: mx.google.com; spf=pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=aneesh.kumar@linux.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4M8SF6E136849; Wed, 22 May 2019 04:28:22 -0400 Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0a-001b2d01.pphosted.com with ESMTP id 2smyuj7gaf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 May 2019 04:28:21 -0400 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x4M4G3D1005567; Wed, 22 May 2019 04:19:20 GMT Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by ppma01dal.us.ibm.com with ESMTP id 2smks6s7um-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 May 2019 04:19:20 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4M8R7ZL18874872 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 22 May 2019 08:27:07 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 44734C6057; Wed, 22 May 2019 08:27:07 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9844DC6059; Wed, 22 May 2019 08:27:05 +0000 (GMT) Received: from skywalker.in.ibm.com (unknown [9.124.31.87]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 22 May 2019 08:27:05 +0000 (GMT) From: "Aneesh Kumar K.V" To: dan.j.williams@intel.com Cc: linux-nvdimm@lists.01.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" Subject: [RFC PATCH V2 1/3] mm/nvdimm: Add PFN_MIN_VERSION support Date: Wed, 22 May 2019 13:56:59 +0530 Message-Id: <20190522082701.6817-1-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-22_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905220062 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This allows us to make changes in a backward incompatible way. I have kept the PFN_MIN_VERSION in this patch '0' because we are not introducing any incompatible changes in this patch. We also may want to backport this to older kernels. The error looks like dax0.1: init failed, superblock min version 1, kernel support version 0 and the namespace is marked disabled $ndctl list -Ni [ { "dev":"namespace0.0", "mode":"fsdax", "map":"mem", "size":10737418240, "uuid":"9605de6d-cefa-4a87-99cd-dec28b02cffe", "state":"disabled" } ] Signed-off-by: Aneesh Kumar K.V --- drivers/nvdimm/pfn.h | 9 ++++++++- drivers/nvdimm/pfn_devs.c | 8 ++++++++ drivers/nvdimm/pmem.c | 26 ++++++++++++++++++++++---- 3 files changed, 38 insertions(+), 5 deletions(-) diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h index dde9853453d3..5fd29242745a 100644 --- a/drivers/nvdimm/pfn.h +++ b/drivers/nvdimm/pfn.h @@ -20,6 +20,12 @@ #define PFN_SIG_LEN 16 #define PFN_SIG "NVDIMM_PFN_INFO\0" #define DAX_SIG "NVDIMM_DAX_INFO\0" +/* + * increment this when we are making changes such that older + * kernel should fail to initialize that namespace. + */ + +#define PFN_MIN_VERSION 0 struct nd_pfn_sb { u8 signature[PFN_SIG_LEN]; @@ -36,7 +42,8 @@ struct nd_pfn_sb { __le32 end_trunc; /* minor-version-2 record the base alignment of the mapping */ __le32 align; - u8 padding[4000]; + __le16 min_version; + u8 padding[3998]; __le64 checksum; }; diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 01f40672507f..a2268cf262f5 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -439,6 +439,13 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0)) return -ENXIO; + if (le16_to_cpu(pfn_sb->min_version) > PFN_MIN_VERSION) { + dev_err(&nd_pfn->dev, + "init failed, superblock min version %ld kernel support version %ld\n", + le16_to_cpu(pfn_sb->min_version), PFN_MIN_VERSION); + return -EOPNOTSUPP; + } + if (memcmp(pfn_sb->signature, sig, PFN_SIG_LEN) != 0) return -ENODEV; @@ -769,6 +776,7 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn) memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); pfn_sb->version_major = cpu_to_le16(1); pfn_sb->version_minor = cpu_to_le16(2); + pfn_sb->min_version = cpu_to_le16(PFN_MIN_VERSION); pfn_sb->start_pad = cpu_to_le32(start_pad); pfn_sb->end_trunc = cpu_to_le32(end_trunc); pfn_sb->align = cpu_to_le32(nd_pfn->align); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 845c5b430cdd..406427c064d9 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -490,6 +490,7 @@ static int pmem_attach_disk(struct device *dev, static int nd_pmem_probe(struct device *dev) { + int ret; struct nd_namespace_common *ndns; ndns = nvdimm_namespace_common_probe(dev); @@ -505,12 +506,29 @@ static int nd_pmem_probe(struct device *dev) if (is_nd_pfn(dev)) return pmem_attach_disk(dev, ndns); - /* if we find a valid info-block we'll come back as that personality */ - if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0 - || nd_dax_probe(dev, ndns) == 0) + ret = nd_btt_probe(dev, ndns); + if (ret == 0) return -ENXIO; + else if (ret == -EOPNOTSUPP) + return ret; - /* ...otherwise we're just a raw pmem device */ + ret = nd_pfn_probe(dev, ndns); + if (ret == 0) + return -ENXIO; + else if (ret == -EOPNOTSUPP) + return ret; + + ret = nd_dax_probe(dev, ndns); + if (ret == 0) + return -ENXIO; + else if (ret == -EOPNOTSUPP) + return ret; + /* + * We have two failure conditions here, there is no + * info reserver block or we found a valid info reserve block + * but failed to initialize the pfn superblock. + * Don't create a raw pmem disk for the second case. + */ return pmem_attach_disk(dev, ndns); } -- 2.21.0