From 8f2bc2430e4ec53ea961997d760c3b35f729e444 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 6 Jun 2017 11:39:30 -0700 Subject: [PATCH] libnvdimm, label: populate 'isetcookie' for blk-aperture namespaces Starting with the v1.2 definition of namespace labels, the isetcookie field is populated and validated for blk-aperture namespaces. This adds some safety against inadvertent copying of namespace labels from one DIMM-device to another. Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 7 +------ drivers/nvdimm/label.c | 12 +++++++++++- drivers/nvdimm/namespace_devs.c | 20 ++++++++++++++------ 3 files changed, 26 insertions(+), 13 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 436cfdd1215b..b930d12f636b 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1736,12 +1736,12 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc, struct nd_region_desc *ndr_desc, struct acpi_nfit_system_address *spa) { - int i, spa_type = nfit_spa_type(spa); struct device *dev = acpi_desc->dev; struct nd_interleave_set *nd_set; u16 nr = ndr_desc->num_mappings; struct nfit_set_info2 *info2; struct nfit_set_info *info; + int i; nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL); if (!nd_set) @@ -1749,11 +1749,6 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc, ndr_desc->nd_set = nd_set; guid_copy(&nd_set->type_guid, (guid_t *) spa->range_guid); - if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE) - /* pass */; - else - return 0; - info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL); if (!info) return -ENOMEM; diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index d8b87d3a0ebe..ba0582fb0e21 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -787,7 +787,17 @@ static int __blk_label_update(struct nd_region *nd_region, nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL); nd_label->nlabel = __cpu_to_le16(0); /* N/A */ nd_label->position = __cpu_to_le16(0); /* N/A */ - nd_label->isetcookie = __cpu_to_le64(0); /* N/A */ + + /* + * Use the presence of the type_guid as a flag to + * determine isetcookie usage for blk-aperture + * namespaces. + */ + if (namespace_label_has(ndd, type_guid)) + nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2); + else + nd_label->isetcookie = __cpu_to_le64(0); /* N/A */ + nd_label->dpa = __cpu_to_le64(res->start); nd_label->rawsize = __cpu_to_le64(resource_size(res)); nd_label->lbasize = __cpu_to_le64(nsblk->lbasize); diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index e101aec186c7..7aba9a569c8e 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -2065,12 +2065,20 @@ struct device *create_namespace_blk(struct nd_region *nd_region, struct device *dev = NULL; struct resource *res; - if (namespace_label_has(ndd, type_guid) - && !guid_equal(&nd_set->type_guid, - &nd_label->type_guid)) { - dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", - nd_set->type_guid.b, nd_label->type_guid.b); - return ERR_PTR(-EAGAIN); + if (namespace_label_has(ndd, type_guid)) { + if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) { + dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", + nd_set->type_guid.b, + nd_label->type_guid.b); + return ERR_PTR(-EAGAIN); + } + + if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) { + dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n", + nd_set->cookie2, + __le64_to_cpu(nd_label->isetcookie)); + return ERR_PTR(-EAGAIN); + } } nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);