2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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.
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.
16 #include <linux/ndctl.h>
17 #include <linux/sizes.h>
18 #include <linux/uuid.h>
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 */
33 BTTINFO_UUID_LEN = 16,
34 BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
35 BTTINFO_MAJOR_VERSION = 1,
36 ND_LABEL_MIN_SIZE = 256 * 4, /* see sizeof_namespace_index() */
37 ND_LABEL_ID_SIZE = 50,
38 ND_NSINDEX_INIT = 0x1,
41 static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
44 * struct nd_namespace_index - label set superblock
45 * @sig: NAMESPACE_INDEX\0
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
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.
62 struct nd_namespace_index {
63 u8 sig[NSINDEX_SIG_LEN];
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
92 struct nd_namespace_label {
93 u8 uuid[NSLABEL_UUID_LEN];
94 u8 name[NSLABEL_NAME_LEN];
104 * Accessing fields past this point should be gated by a
105 * namespace_label_has() check.
110 guid_t abstraction_guid;
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"
121 * struct nd_label_id - identifier string for dpa allocation
122 * @id: "{blk|pmem}-<namespace uuid>"
125 char id[ND_LABEL_ID_SIZE];
129 * If the 'best' index is invalid, so is the 'next' index. Otherwise,
130 * the next index is MOD(index+1, 2)
132 static inline int nd_label_next_nsindex(int index)
137 return (index + 1) % 2;
140 struct nvdimm_drvdata;
141 int nd_label_data_init(struct nvdimm_drvdata *ndd);
142 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
143 int nd_label_active_count(struct nvdimm_drvdata *ndd);
144 struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
145 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
146 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
147 u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
148 enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid);
150 struct nd_namespace_pmem;
151 struct nd_namespace_blk;
152 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
153 struct nd_namespace_pmem *nspm, resource_size_t size);
154 int nd_blk_namespace_label_update(struct nd_region *nd_region,
155 struct nd_namespace_blk *nsblk, resource_size_t size);
156 #endif /* __LABEL_H__ */