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/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#ifndef __LABEL_H__
#define __LABEL_H__
#include <linux/ndctl.h>
#include <linux/sizes.h>
#include <linux/io.h>
enum {
NSINDEX_SIG_LEN = 16,
NSINDEX_ALIGN = 256,
NSINDEX_SEQ_MASK = 0x3,
NSLABEL_UUID_LEN = 16,
NSLABEL_NAME_LEN = 64,
NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
BTT_ALIGN = 4096, /* all btt structures */
BTTINFO_SIG_LEN = 16,
BTTINFO_UUID_LEN = 16,
BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
BTTINFO_MAJOR_VERSION = 1,
ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
ND_LABEL_ID_SIZE = 50,
};
static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
/**
* struct nd_namespace_index - label set superblock
* @sig: NAMESPACE_INDEX\0
* @flags: placeholder
* @seq: sequence number for this index
* @myoff: offset of this index in label area
* @mysize: size of this index struct
* @otheroff: offset of other index
* @labeloff: offset of first label slot
* @nslot: total number of label slots
* @major: label area major version
* @minor: label area minor version
* @checksum: fletcher64 of all fields
* @free[0]: bitmap, nlabel bits
*
* The size of free[] is rounded up so the total struct size is a
* multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond
* nlabel bits must be zero.
*/
struct nd_namespace_index {
u8 sig[NSINDEX_SIG_LEN];
__le32 flags;
__le32 seq;
__le64 myoff;
__le64 mysize;
__le64 otheroff;
__le64 labeloff;
__le32 nslot;
__le16 major;
__le16 minor;
__le64 checksum;
u8 free[0];
};
/**
* struct nd_namespace_label - namespace superblock
* @uuid: UUID per RFC 4122
* @name: optional name (NULL-terminated)
* @flags: see NSLABEL_FLAG_*
* @nlabel: num labels to describe this ns
* @position: labels position in set
* @isetcookie: interleave set cookie
* @lbasize: LBA size in bytes or 0 for pmem
* @dpa: DPA of NVM range on this DIMM
* @rawsize: size of namespace
* @slot: slot of this label in label area
* @unused: must be zero
*/
struct nd_namespace_label {
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
__le16 nlabel;
__le16 position;
__le64 isetcookie;
__le64 lbasize;
__le64 dpa;
__le64 rawsize;
__le32 slot;
__le32 unused;
};
/**
* struct nd_label_id - identifier string for dpa allocation
* @id: "{blk|pmem}-<namespace uuid>"
*/
struct nd_label_id {
char id[ND_LABEL_ID_SIZE];
};
/*
* If the 'best' index is invalid, so is the 'next' index. Otherwise,
* the next index is MOD(index+1, 2)
*/
static inline int nd_label_next_nsindex(int index)
{
if (index < 0)
return -1;
return (index + 1) % 2;
}
struct nvdimm_drvdata;
int nd_label_validate(struct nvdimm_drvdata *ndd);
void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
struct nd_namespace_index *src);
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
int nd_label_active_count(struct nvdimm_drvdata *ndd);
struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
#endif /* __LABEL_H__ */
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