Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 680 insertions, 0 deletions

diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
new file mode 100644
index 0000000000..e8b9d27dbb
--- /dev/null
+++ b/drivers/nvdimm/nd.h
@@ -0,0 +1,680 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ */
+#ifndef __ND_H__
+#define __ND_H__
+#include <linux/libnvdimm.h>
+#include <linux/badblocks.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/ndctl.h>
+#include <linux/types.h>
+#include <linux/nd.h>
+#include "label.h"
+
+enum {
+	/*
+	 * Limits the maximum number of block apertures a dimm can
+	 * support and is an input to the geometry/on-disk-format of a
+	 * BTT instance
+	 */
+	ND_MAX_LANES = 256,
+	INT_LBASIZE_ALIGNMENT = 64,
+	NVDIMM_IO_ATOMIC = 1,
+};
+
+struct nvdimm_drvdata {
+	struct device *dev;
+	int nslabel_size;
+	struct nd_cmd_get_config_size nsarea;
+	void *data;
+	bool cxl;
+	int ns_current, ns_next;
+	struct resource dpa;
+	struct kref kref;
+};
+
+static inline const u8 *nsl_ref_name(struct nvdimm_drvdata *ndd,
+				     struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return nd_label->cxl.name;
+	return nd_label->efi.name;
+}
+
+static inline u8 *nsl_get_name(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label, u8 *name)
+{
+	if (ndd->cxl)
+		return memcpy(name, nd_label->cxl.name, NSLABEL_NAME_LEN);
+	return memcpy(name, nd_label->efi.name, NSLABEL_NAME_LEN);
+}
+
+static inline u8 *nsl_set_name(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label, u8 *name)
+{
+	if (!name)
+		return NULL;
+	if (ndd->cxl)
+		return memcpy(nd_label->cxl.name, name, NSLABEL_NAME_LEN);
+	return memcpy(nd_label->efi.name, name, NSLABEL_NAME_LEN);
+}
+
+static inline u32 nsl_get_slot(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le32_to_cpu(nd_label->cxl.slot);
+	return __le32_to_cpu(nd_label->efi.slot);
+}
+
+static inline void nsl_set_slot(struct nvdimm_drvdata *ndd,
+				struct nd_namespace_label *nd_label, u32 slot)
+{
+	if (ndd->cxl)
+		nd_label->cxl.slot = __cpu_to_le32(slot);
+	else
+		nd_label->efi.slot = __cpu_to_le32(slot);
+}
+
+static inline u64 nsl_get_checksum(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le64_to_cpu(nd_label->cxl.checksum);
+	return __le64_to_cpu(nd_label->efi.checksum);
+}
+
+static inline void nsl_set_checksum(struct nvdimm_drvdata *ndd,
+				    struct nd_namespace_label *nd_label,
+				    u64 checksum)
+{
+	if (ndd->cxl)
+		nd_label->cxl.checksum = __cpu_to_le64(checksum);
+	else
+		nd_label->efi.checksum = __cpu_to_le64(checksum);
+}
+
+static inline u32 nsl_get_flags(struct nvdimm_drvdata *ndd,
+				struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le32_to_cpu(nd_label->cxl.flags);
+	return __le32_to_cpu(nd_label->efi.flags);
+}
+
+static inline void nsl_set_flags(struct nvdimm_drvdata *ndd,
+				 struct nd_namespace_label *nd_label, u32 flags)
+{
+	if (ndd->cxl)
+		nd_label->cxl.flags = __cpu_to_le32(flags);
+	else
+		nd_label->efi.flags = __cpu_to_le32(flags);
+}
+
+static inline u64 nsl_get_dpa(struct nvdimm_drvdata *ndd,
+			      struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le64_to_cpu(nd_label->cxl.dpa);
+	return __le64_to_cpu(nd_label->efi.dpa);
+}
+
+static inline void nsl_set_dpa(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label, u64 dpa)
+{
+	if (ndd->cxl)
+		nd_label->cxl.dpa = __cpu_to_le64(dpa);
+	else
+		nd_label->efi.dpa = __cpu_to_le64(dpa);
+}
+
+static inline u64 nsl_get_rawsize(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le64_to_cpu(nd_label->cxl.rawsize);
+	return __le64_to_cpu(nd_label->efi.rawsize);
+}
+
+static inline void nsl_set_rawsize(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label,
+				   u64 rawsize)
+{
+	if (ndd->cxl)
+		nd_label->cxl.rawsize = __cpu_to_le64(rawsize);
+	else
+		nd_label->efi.rawsize = __cpu_to_le64(rawsize);
+}
+
+static inline u64 nsl_get_isetcookie(struct nvdimm_drvdata *ndd,
+				     struct nd_namespace_label *nd_label)
+{
+	/* WARN future refactor attempts that break this assumption */
+	if (dev_WARN_ONCE(ndd->dev, ndd->cxl,
+			  "CXL labels do not use the isetcookie concept\n"))
+		return 0;
+	return __le64_to_cpu(nd_label->efi.isetcookie);
+}
+
+static inline void nsl_set_isetcookie(struct nvdimm_drvdata *ndd,
+				      struct nd_namespace_label *nd_label,
+				      u64 isetcookie)
+{
+	if (!ndd->cxl)
+		nd_label->efi.isetcookie = __cpu_to_le64(isetcookie);
+}
+
+static inline bool nsl_validate_isetcookie(struct nvdimm_drvdata *ndd,
+					   struct nd_namespace_label *nd_label,
+					   u64 cookie)
+{
+	/*
+	 * Let the EFI and CXL validation comingle, where fields that
+	 * don't matter to CXL always validate.
+	 */
+	if (ndd->cxl)
+		return true;
+	return cookie == __le64_to_cpu(nd_label->efi.isetcookie);
+}
+
+static inline u16 nsl_get_position(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le16_to_cpu(nd_label->cxl.position);
+	return __le16_to_cpu(nd_label->efi.position);
+}
+
+static inline void nsl_set_position(struct nvdimm_drvdata *ndd,
+				    struct nd_namespace_label *nd_label,
+				    u16 position)
+{
+	if (ndd->cxl)
+		nd_label->cxl.position = __cpu_to_le16(position);
+	else
+		nd_label->efi.position = __cpu_to_le16(position);
+}
+
+static inline u16 nsl_get_nlabel(struct nvdimm_drvdata *ndd,
+				 struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return 0;
+	return __le16_to_cpu(nd_label->efi.nlabel);
+}
+
+static inline void nsl_set_nlabel(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label,
+				  u16 nlabel)
+{
+	if (!ndd->cxl)
+		nd_label->efi.nlabel = __cpu_to_le16(nlabel);
+}
+
+static inline u16 nsl_get_nrange(struct nvdimm_drvdata *ndd,
+				 struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return __le16_to_cpu(nd_label->cxl.nrange);
+	return 1;
+}
+
+static inline void nsl_set_nrange(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label,
+				  u16 nrange)
+{
+	if (ndd->cxl)
+		nd_label->cxl.nrange = __cpu_to_le16(nrange);
+}
+
+static inline u64 nsl_get_lbasize(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label)
+{
+	/*
+	 * Yes, for some reason the EFI labels convey a massive 64-bit
+	 * lbasize, that got fixed for CXL.
+	 */
+	if (ndd->cxl)
+		return __le16_to_cpu(nd_label->cxl.lbasize);
+	return __le64_to_cpu(nd_label->efi.lbasize);
+}
+
+static inline void nsl_set_lbasize(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label,
+				   u64 lbasize)
+{
+	if (ndd->cxl)
+		nd_label->cxl.lbasize = __cpu_to_le16(lbasize);
+	else
+		nd_label->efi.lbasize = __cpu_to_le64(lbasize);
+}
+
+static inline const uuid_t *nsl_get_uuid(struct nvdimm_drvdata *ndd,
+					 struct nd_namespace_label *nd_label,
+					 uuid_t *uuid)
+{
+	if (ndd->cxl)
+		import_uuid(uuid, nd_label->cxl.uuid);
+	else
+		import_uuid(uuid, nd_label->efi.uuid);
+	return uuid;
+}
+
+static inline const uuid_t *nsl_set_uuid(struct nvdimm_drvdata *ndd,
+					 struct nd_namespace_label *nd_label,
+					 const uuid_t *uuid)
+{
+	if (ndd->cxl)
+		export_uuid(nd_label->cxl.uuid, uuid);
+	else
+		export_uuid(nd_label->efi.uuid, uuid);
+	return uuid;
+}
+
+static inline bool nsl_uuid_equal(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label,
+				  const uuid_t *uuid)
+{
+	uuid_t tmp;
+
+	if (ndd->cxl)
+		import_uuid(&tmp, nd_label->cxl.uuid);
+	else
+		import_uuid(&tmp, nd_label->efi.uuid);
+	return uuid_equal(&tmp, uuid);
+}
+
+static inline const u8 *nsl_uuid_raw(struct nvdimm_drvdata *ndd,
+				     struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return nd_label->cxl.uuid;
+	return nd_label->efi.uuid;
+}
+
+bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd,
+			    struct nd_namespace_label *nd_label, guid_t *guid);
+enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd,
+					    struct nd_namespace_label *nd_label);
+
+struct nd_region_data {
+	int ns_count;
+	int ns_active;
+	unsigned int hints_shift;
+	void __iomem *flush_wpq[];
+};
+
+static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
+		int dimm, int hint)
+{
+	unsigned int num = 1 << ndrd->hints_shift;
+	unsigned int mask = num - 1;
+
+	return ndrd->flush_wpq[dimm * num + (hint & mask)];
+}
+
+static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
+		int hint, void __iomem *flush)
+{
+	unsigned int num = 1 << ndrd->hints_shift;
+	unsigned int mask = num - 1;
+
+	ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
+}
+
+static inline struct nd_namespace_index *to_namespace_index(
+		struct nvdimm_drvdata *ndd, int i)
+{
+	if (i < 0)
+		return NULL;
+
+	return ndd->data + sizeof_namespace_index(ndd) * i;
+}
+
+static inline struct nd_namespace_index *to_current_namespace_index(
+		struct nvdimm_drvdata *ndd)
+{
+	return to_namespace_index(ndd, ndd->ns_current);
+}
+
+static inline struct nd_namespace_index *to_next_namespace_index(
+		struct nvdimm_drvdata *ndd)
+{
+	return to_namespace_index(ndd, ndd->ns_next);
+}
+
+unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
+
+#define efi_namespace_label_has(ndd, field) \
+	(!ndd->cxl && offsetof(struct nvdimm_efi_label, field) \
+		< sizeof_namespace_label(ndd))
+
+#define nd_dbg_dpa(r, d, res, fmt, arg...) \
+	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
+		(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
+		(unsigned long long) (res ? resource_size(res) : 0), \
+		(unsigned long long) (res ? res->start : 0), ##arg)
+
+#define for_each_dpa_resource(ndd, res) \
+	for (res = (ndd)->dpa.child; res; res = res->sibling)
+
+#define for_each_dpa_resource_safe(ndd, res, next) \
+	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
+			res; res = next, next = next ? next->sibling : NULL)
+
+struct nd_percpu_lane {
+	int count;
+	spinlock_t lock;
+};
+
+enum nd_label_flags {
+	ND_LABEL_REAP,
+};
+struct nd_label_ent {
+	struct list_head list;
+	unsigned long flags;
+	struct nd_namespace_label *label;
+};
+
+enum nd_mapping_lock_class {
+	ND_MAPPING_CLASS0,
+	ND_MAPPING_UUID_SCAN,
+};
+
+struct nd_mapping {
+	struct nvdimm *nvdimm;
+	u64 start;
+	u64 size;
+	int position;
+	struct list_head labels;
+	struct mutex lock;
+	/*
+	 * @ndd is for private use at region enable / disable time for
+	 * get_ndd() + put_ndd(), all other nd_mapping to ndd
+	 * conversions use to_ndd() which respects enabled state of the
+	 * nvdimm.
+	 */
+	struct nvdimm_drvdata *ndd;
+};
+
+struct nd_region {
+	struct device dev;
+	struct ida ns_ida;
+	struct ida btt_ida;
+	struct ida pfn_ida;
+	struct ida dax_ida;
+	unsigned long flags;
+	struct device *ns_seed;
+	struct device *btt_seed;
+	struct device *pfn_seed;
+	struct device *dax_seed;
+	unsigned long align;
+	u16 ndr_mappings;
+	u64 ndr_size;
+	u64 ndr_start;
+	int id, num_lanes, ro, numa_node, target_node;
+	void *provider_data;
+	struct kernfs_node *bb_state;
+	struct badblocks bb;
+	struct nd_interleave_set *nd_set;
+	struct nd_percpu_lane __percpu *lane;
+	int (*flush)(struct nd_region *nd_region, struct bio *bio);
+	struct nd_mapping mapping[];
+};
+
+static inline bool nsl_validate_nlabel(struct nd_region *nd_region,
+				       struct nvdimm_drvdata *ndd,
+				       struct nd_namespace_label *nd_label)
+{
+	if (ndd->cxl)
+		return true;
+	return nsl_get_nlabel(ndd, nd_label) == nd_region->ndr_mappings;
+}
+
+/*
+ * Lookup next in the repeating sequence of 01, 10, and 11.
+ */
+static inline unsigned nd_inc_seq(unsigned seq)
+{
+	static const unsigned next[] = { 0, 2, 3, 1 };
+
+	return next[seq & 3];
+}
+
+struct btt;
+struct nd_btt {
+	struct device dev;
+	struct nd_namespace_common *ndns;
+	struct btt *btt;
+	unsigned long lbasize;
+	u64 size;
+	uuid_t *uuid;
+	int id;
+	int initial_offset;
+	u16 version_major;
+	u16 version_minor;
+};
+
+enum nd_pfn_mode {
+	PFN_MODE_NONE,
+	PFN_MODE_RAM,
+	PFN_MODE_PMEM,
+};
+
+struct nd_pfn {
+	int id;
+	uuid_t *uuid;
+	struct device dev;
+	unsigned long align;
+	unsigned long npfns;
+	enum nd_pfn_mode mode;
+	struct nd_pfn_sb *pfn_sb;
+	struct nd_namespace_common *ndns;
+};
+
+struct nd_dax {
+	struct nd_pfn nd_pfn;
+};
+
+static inline u32 nd_info_block_reserve(void)
+{
+	return ALIGN(SZ_8K, PAGE_SIZE);
+}
+
+enum nd_async_mode {
+	ND_SYNC,
+	ND_ASYNC,
+};
+
+int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
+void wait_nvdimm_bus_probe_idle(struct device *dev);
+void nd_device_register(struct device *dev);
+void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
+void nd_device_notify(struct device *dev, enum nvdimm_event event);
+int nd_uuid_store(struct device *dev, uuid_t **uuid_out, const char *buf,
+		size_t len);
+ssize_t nd_size_select_show(unsigned long current_size,
+		const unsigned long *supported, char *buf);
+ssize_t nd_size_select_store(struct device *dev, const char *buf,
+		unsigned long *current_size, const unsigned long *supported);
+int __init nvdimm_init(void);
+int __init nd_region_init(void);
+int __init nd_label_init(void);
+void nvdimm_exit(void);
+void nd_region_exit(void);
+struct nvdimm;
+extern const struct attribute_group nd_device_attribute_group;
+extern const struct attribute_group nd_numa_attribute_group;
+extern const struct attribute_group *nvdimm_bus_attribute_groups[];
+struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
+int nvdimm_check_config_data(struct device *dev);
+int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
+int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
+int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
+			   size_t offset, size_t len);
+int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
+		void *buf, size_t len);
+long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
+		unsigned int len);
+void nvdimm_set_labeling(struct device *dev);
+void nvdimm_set_locked(struct device *dev);
+void nvdimm_clear_locked(struct device *dev);
+int nvdimm_security_setup_events(struct device *dev);
+#if IS_ENABLED(CONFIG_NVDIMM_KEYS)
+int nvdimm_security_unlock(struct device *dev);
+#else
+static inline int nvdimm_security_unlock(struct device *dev)
+{
+	return 0;
+}
+#endif
+struct nd_btt *to_nd_btt(struct device *dev);
+
+struct nd_gen_sb {
+	char reserved[SZ_4K - 8];
+	__le64 checksum;
+};
+
+u64 nd_sb_checksum(struct nd_gen_sb *sb);
+#if IS_ENABLED(CONFIG_BTT)
+int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
+bool is_nd_btt(struct device *dev);
+struct device *nd_btt_create(struct nd_region *nd_region);
+#else
+static inline int nd_btt_probe(struct device *dev,
+		struct nd_namespace_common *ndns)
+{
+	return -ENODEV;
+}
+
+static inline bool is_nd_btt(struct device *dev)
+{
+	return false;
+}
+
+static inline struct device *nd_btt_create(struct nd_region *nd_region)
+{
+	return NULL;
+}
+#endif
+
+struct nd_pfn *to_nd_pfn(struct device *dev);
+#if IS_ENABLED(CONFIG_NVDIMM_PFN)
+
+#define MAX_NVDIMM_ALIGN	4
+
+int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
+bool is_nd_pfn(struct device *dev);
+struct device *nd_pfn_create(struct nd_region *nd_region);
+struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
+		struct nd_namespace_common *ndns);
+int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
+extern const struct attribute_group *nd_pfn_attribute_groups[];
+#else
+static inline int nd_pfn_probe(struct device *dev,
+		struct nd_namespace_common *ndns)
+{
+	return -ENODEV;
+}
+
+static inline bool is_nd_pfn(struct device *dev)
+{
+	return false;
+}
+
+static inline struct device *nd_pfn_create(struct nd_region *nd_region)
+{
+	return NULL;
+}
+
+static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
+{
+	return -ENODEV;
+}
+#endif
+
+struct nd_dax *to_nd_dax(struct device *dev);
+#if IS_ENABLED(CONFIG_NVDIMM_DAX)
+int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
+bool is_nd_dax(const struct device *dev);
+struct device *nd_dax_create(struct nd_region *nd_region);
+#else
+static inline int nd_dax_probe(struct device *dev,
+		struct nd_namespace_common *ndns)
+{
+	return -ENODEV;
+}
+
+static inline bool is_nd_dax(const struct device *dev)
+{
+	return false;
+}
+
+static inline struct device *nd_dax_create(struct nd_region *nd_region)
+{
+	return NULL;
+}
+#endif
+
+int nd_region_to_nstype(struct nd_region *nd_region);
+int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
+u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
+		struct nd_namespace_index *nsindex);
+u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
+void nvdimm_bus_lock(struct device *dev);
+void nvdimm_bus_unlock(struct device *dev);
+bool is_nvdimm_bus_locked(struct device *dev);
+void nvdimm_check_and_set_ro(struct gendisk *disk);
+void nvdimm_drvdata_release(struct kref *kref);
+void put_ndd(struct nvdimm_drvdata *ndd);
+int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
+void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
+struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
+		struct nd_label_id *label_id, resource_size_t start,
+		resource_size_t n);
+resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
+bool nvdimm_namespace_locked(struct nd_namespace_common *ndns);
+struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
+int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
+int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
+const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
+		char *name);
+unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
+struct range;
+void nvdimm_badblocks_populate(struct nd_region *nd_region,
+		struct badblocks *bb, const struct range *range);
+int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
+		resource_size_t size);
+void devm_namespace_disable(struct device *dev,
+		struct nd_namespace_common *ndns);
+#if IS_ENABLED(CONFIG_ND_CLAIM)
+/* max struct page size independent of kernel config */
+#define MAX_STRUCT_PAGE_SIZE 64
+int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
+#else
+static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
+				   struct dev_pagemap *pgmap)
+{
+	return -ENXIO;
+}
+#endif
+int nd_region_activate(struct nd_region *nd_region);
+static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
+		unsigned int len)
+{
+	if (bb->count) {
+		sector_t first_bad;
+		int num_bad;
+
+		return !!badblocks_check(bb, sector, len / 512, &first_bad,
+				&num_bad);
+	}
+
+	return false;
+}
+const uuid_t *nd_dev_to_uuid(struct device *dev);
+bool pmem_should_map_pages(struct device *dev);
+#endif /* __ND_H__ */