cregit-Linux how code gets into the kernel

Release 4.10 drivers/nvdimm/label.h

Directory: drivers/nvdimm
/*
 * 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,
	
ND_NSINDEX_INIT = 0x1,
};


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; }

Contributors

PersonTokensPropCommitsCommitProp
dan williamsdan williams29100.00%1100.00%
Total29100.00%1100.00%

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); u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd); bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot); u32 nd_label_nfree(struct nvdimm_drvdata *ndd); struct nd_region; struct nd_namespace_pmem; struct nd_namespace_blk; int nd_pmem_namespace_label_update(struct nd_region *nd_region, struct nd_namespace_pmem *nspm, resource_size_t size); int nd_blk_namespace_label_update(struct nd_region *nd_region, struct nd_namespace_blk *nsblk, resource_size_t size); #endif /* __LABEL_H__ */

Overall Contributors

PersonTokensPropCommitsCommitProp
dan williamsdan williams378100.00%4100.00%
Total378100.00%4100.00%
Directory: drivers/nvdimm
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