tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13#ifndef __LABEL_H__
14#define __LABEL_H__
15
16#include <linux/ndctl.h>
17#include <linux/sizes.h>
18#include <linux/uuid.h>
19#include <linux/io.h>
20
21enum {
22 NSINDEX_SIG_LEN = 16,
23 NSINDEX_ALIGN = 256,
24 NSINDEX_SEQ_MASK = 0x3,
25 NSLABEL_UUID_LEN = 16,
26 NSLABEL_NAME_LEN = 64,
27 NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
28 NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
29 NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
30 NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
31 BTT_ALIGN = 4096, /* all btt structures */
32 BTTINFO_SIG_LEN = 16,
33 BTTINFO_UUID_LEN = 16,
34 BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
35 BTTINFO_MAJOR_VERSION = 1,
36 ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
37 ND_LABEL_ID_SIZE = 50,
38 ND_NSINDEX_INIT = 0x1,
39};
40
41static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
42
43/**
44 * struct nd_namespace_index - label set superblock
45 * @sig: NAMESPACE_INDEX\0
46 * @flags: placeholder
47 * @seq: sequence number for this index
48 * @myoff: offset of this index in label area
49 * @mysize: size of this index struct
50 * @otheroff: offset of other index
51 * @labeloff: offset of first label slot
52 * @nslot: total number of label slots
53 * @major: label area major version
54 * @minor: label area minor version
55 * @checksum: fletcher64 of all fields
56 * @free[0]: bitmap, nlabel bits
57 *
58 * The size of free[] is rounded up so the total struct size is a
59 * multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond
60 * nlabel bits must be zero.
61 */
62struct nd_namespace_index {
63 u8 sig[NSINDEX_SIG_LEN];
64 u8 flags[3];
65 u8 labelsize;
66 __le32 seq;
67 __le64 myoff;
68 __le64 mysize;
69 __le64 otheroff;
70 __le64 labeloff;
71 __le32 nslot;
72 __le16 major;
73 __le16 minor;
74 __le64 checksum;
75 u8 free[0];
76};
77
78/**
79 * struct nd_namespace_label - namespace superblock
80 * @uuid: UUID per RFC 4122
81 * @name: optional name (NULL-terminated)
82 * @flags: see NSLABEL_FLAG_*
83 * @nlabel: num labels to describe this ns
84 * @position: labels position in set
85 * @isetcookie: interleave set cookie
86 * @lbasize: LBA size in bytes or 0 for pmem
87 * @dpa: DPA of NVM range on this DIMM
88 * @rawsize: size of namespace
89 * @slot: slot of this label in label area
90 * @unused: must be zero
91 */
92struct nd_namespace_label {
93 u8 uuid[NSLABEL_UUID_LEN];
94 u8 name[NSLABEL_NAME_LEN];
95 __le32 flags;
96 __le16 nlabel;
97 __le16 position;
98 __le64 isetcookie;
99 __le64 lbasize;
100 __le64 dpa;
101 __le64 rawsize;
102 __le32 slot;
103 /*
104 * Accessing fields past this point should be gated by a
105 * namespace_label_has() check.
106 */
107 u8 align;
108 u8 reserved[3];
109 guid_t type_guid;
110 guid_t abstraction_guid;
111 u8 reserved2[88];
112 __le64 checksum;
113};
114
115#define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
116#define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8"
117#define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
118#define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
119
120/**
121 * struct nd_label_id - identifier string for dpa allocation
122 * @id: "{blk|pmem}-<namespace uuid>"
123 */
124struct nd_label_id {
125 char id[ND_LABEL_ID_SIZE];
126};
127
128/*
129 * If the 'best' index is invalid, so is the 'next' index. Otherwise,
130 * the next index is MOD(index+1, 2)
131 */
132static inline int nd_label_next_nsindex(int index)
133{
134 if (index < 0)
135 return -1;
136
137 return (index + 1) % 2;
138}
139
140struct nvdimm_drvdata;
141int nd_label_validate(struct nvdimm_drvdata *ndd);
142void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
143 struct nd_namespace_index *src);
144size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
145int nd_label_active_count(struct nvdimm_drvdata *ndd);
146struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
147u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
148bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
149u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
150enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid);
151struct nd_region;
152struct nd_namespace_pmem;
153struct nd_namespace_blk;
154int nd_pmem_namespace_label_update(struct nd_region *nd_region,
155 struct nd_namespace_pmem *nspm, resource_size_t size);
156int nd_blk_namespace_label_update(struct nd_region *nd_region,
157 struct nd_namespace_blk *nsblk, resource_size_t size);
158#endif /* __LABEL_H__ */