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64c4757e NB |
1 | /* |
2 | md_p.h : physical layout of Linux RAID devices | |
3 | Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman | |
aba69144 | 4 | |
64c4757e NB |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2, or (at your option) | |
8 | any later version. | |
aba69144 | 9 | |
64c4757e NB |
10 | You should have received a copy of the GNU General Public License |
11 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
aba69144 | 12 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
64c4757e NB |
13 | */ |
14 | ||
15 | #ifndef _MD_P_H | |
16 | #define _MD_P_H | |
17 | ||
18 | /* | |
19 | * RAID superblock. | |
20 | * | |
21 | * The RAID superblock maintains some statistics on each RAID configuration. | |
22 | * Each real device in the RAID set contains it near the end of the device. | |
23 | * Some of the ideas are copied from the ext2fs implementation. | |
24 | * | |
25 | * We currently use 4096 bytes as follows: | |
26 | * | |
27 | * word offset function | |
28 | * | |
29 | * 0 - 31 Constant generic RAID device information. | |
30 | * 32 - 63 Generic state information. | |
31 | * 64 - 127 Personality specific information. | |
32 | * 128 - 511 12 32-words descriptors of the disks in the raid set. | |
33 | * 512 - 911 Reserved. | |
34 | * 912 - 1023 Disk specific descriptor. | |
35 | */ | |
36 | ||
37 | /* | |
38 | * If x is the real device size in bytes, we return an apparent size of: | |
39 | * | |
40 | * y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES | |
41 | * | |
42 | * and place the 4kB superblock at offset y. | |
43 | */ | |
44 | #define MD_RESERVED_BYTES (64 * 1024) | |
45 | #define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512) | |
46 | #define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE) | |
47 | ||
48 | #define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS) | |
49 | #define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS) | |
50 | ||
51 | #define MD_SB_BYTES 4096 | |
52 | #define MD_SB_WORDS (MD_SB_BYTES / 4) | |
53 | #define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE) | |
54 | #define MD_SB_SECTORS (MD_SB_BYTES / 512) | |
55 | ||
56 | /* | |
57 | * The following are counted in 32-bit words | |
58 | */ | |
59 | #define MD_SB_GENERIC_OFFSET 0 | |
60 | #define MD_SB_PERSONALITY_OFFSET 64 | |
61 | #define MD_SB_DISKS_OFFSET 128 | |
62 | #define MD_SB_DESCRIPTOR_OFFSET 992 | |
63 | ||
64 | #define MD_SB_GENERIC_CONSTANT_WORDS 32 | |
65 | #define MD_SB_GENERIC_STATE_WORDS 32 | |
66 | #define MD_SB_GENERIC_WORDS (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS) | |
67 | #define MD_SB_PERSONALITY_WORDS 64 | |
68 | #define MD_SB_DESCRIPTOR_WORDS 32 | |
69 | #define MD_SB_DISKS 27 | |
70 | #define MD_SB_DISKS_WORDS (MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS) | |
71 | #define MD_SB_RESERVED_WORDS (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS) | |
72 | #define MD_SB_EQUAL_WORDS (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS) | |
73 | ||
74 | /* | |
75 | * Device "operational" state bits | |
76 | */ | |
77 | #define MD_DISK_FAULTY 0 /* disk is faulty / operational */ | |
f22385f9 | 78 | #define MD_DISK_ACTIVE 1 /* disk is running but may not be in sync */ |
64c4757e NB |
79 | #define MD_DISK_SYNC 2 /* disk is in sync with the raid set */ |
80 | #define MD_DISK_REMOVED 3 /* disk is in sync with the raid set */ | |
4de90913 GJ |
81 | #define MD_DISK_CLUSTER_ADD 4 /* Initiate a disk add across the cluster |
82 | * For clustered enviroments only. | |
83 | */ | |
84 | #define MD_DISK_CANDIDATE 5 /* disk is added as spare (local) until confirmed | |
85 | * For clustered enviroments only. | |
86 | */ | |
64c4757e | 87 | |
dfd4d8ee | 88 | #define MD_DISK_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config. |
aba69144 | 89 | * read requests will only be sent here in |
dfd4d8ee NB |
90 | * dire need |
91 | */ | |
71574efb | 92 | #define MD_DISK_FAILFAST 10 /* Fewer retries, more failures */ |
dfd4d8ee | 93 | |
aacb2f81 | 94 | #define MD_DISK_REPLACEMENT 17 |
ed94976d | 95 | #define MD_DISK_JOURNAL 18 /* disk is used as the write journal in RAID-5/6 */ |
aacb2f81 | 96 | |
fa7574f6 SL |
97 | #define MD_DISK_ROLE_SPARE 0xffff |
98 | #define MD_DISK_ROLE_FAULTY 0xfffe | |
ed94976d | 99 | #define MD_DISK_ROLE_JOURNAL 0xfffd |
fa7574f6 SL |
100 | #define MD_DISK_ROLE_MAX 0xff00 /* max value of regular disk role */ |
101 | ||
64c4757e NB |
102 | typedef struct mdp_device_descriptor_s { |
103 | __u32 number; /* 0 Device number in the entire set */ | |
104 | __u32 major; /* 1 Device major number */ | |
105 | __u32 minor; /* 2 Device minor number */ | |
106 | __u32 raid_disk; /* 3 The role of the device in the raid set */ | |
107 | __u32 state; /* 4 Operational state */ | |
108 | __u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5]; | |
109 | } mdp_disk_t; | |
110 | ||
111 | #define MD_SB_MAGIC 0xa92b4efc | |
112 | ||
113 | /* | |
114 | * Superblock state bits | |
115 | */ | |
116 | #define MD_SB_CLEAN 0 | |
117 | #define MD_SB_ERRORS 1 | |
a06d022d | 118 | #define MD_SB_BBM_ERRORS 2 |
81219e70 LM |
119 | #define MD_SB_BLOCK_CONTAINER_RESHAPE 3 /* block container wide reshapes */ |
120 | #define MD_SB_BLOCK_VOLUME 4 /* block activation of array, other arrays | |
121 | * in container can be activated */ | |
4de90913 | 122 | #define MD_SB_CLUSTERED 5 /* MD is clustered */ |
55935d51 NB |
123 | #define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */ |
124 | ||
64c4757e NB |
125 | typedef struct mdp_superblock_s { |
126 | /* | |
127 | * Constant generic information | |
128 | */ | |
1011e834 | 129 | __u32 md_magic; /* 0 MD identifier */ |
64c4757e NB |
130 | __u32 major_version; /* 1 major version to which the set conforms */ |
131 | __u32 minor_version; /* 2 minor version ... */ | |
132 | __u32 patch_version; /* 3 patchlevel version ... */ | |
133 | __u32 gvalid_words; /* 4 Number of used words in this section */ | |
134 | __u32 set_uuid0; /* 5 Raid set identifier */ | |
135 | __u32 ctime; /* 6 Creation time */ | |
136 | __u32 level; /* 7 Raid personality */ | |
137 | __u32 size; /* 8 Apparent size of each individual disk */ | |
138 | __u32 nr_disks; /* 9 total disks in the raid set */ | |
139 | __u32 raid_disks; /* 10 disks in a fully functional raid set */ | |
140 | __u32 md_minor; /* 11 preferred MD minor device number */ | |
141 | __u32 not_persistent; /* 12 does it have a persistent superblock */ | |
142 | __u32 set_uuid1; /* 13 Raid set identifier #2 */ | |
143 | __u32 set_uuid2; /* 14 Raid set identifier #3 */ | |
144 | __u32 set_uuid3; /* 15 Raid set identifier #4 */ | |
145 | __u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16]; | |
146 | ||
147 | /* | |
148 | * Generic state information | |
149 | */ | |
150 | __u32 utime; /* 0 Superblock update time */ | |
151 | __u32 state; /* 1 State bits (clean, ...) */ | |
152 | __u32 active_disks; /* 2 Number of currently active disks */ | |
153 | __u32 working_disks; /* 3 Number of working disks */ | |
154 | __u32 failed_disks; /* 4 Number of failed disks */ | |
155 | __u32 spare_disks; /* 5 Number of spare disks */ | |
156 | __u32 sb_csum; /* 6 checksum of the whole superblock */ | |
52826846 | 157 | #if __BYTE_ORDER == __BIG_ENDIAN |
64c4757e NB |
158 | __u32 events_hi; /* 7 high-order of superblock update count */ |
159 | __u32 events_lo; /* 8 low-order of superblock update count */ | |
e5329c37 NB |
160 | __u32 cp_events_hi; /* 9 high-order of checkpoint update count */ |
161 | __u32 cp_events_lo; /* 10 low-order of checkpoint update count */ | |
64c4757e NB |
162 | #else |
163 | __u32 events_lo; /* 7 low-order of superblock update count */ | |
164 | __u32 events_hi; /* 8 high-order of superblock update count */ | |
e5329c37 NB |
165 | __u32 cp_events_lo; /* 9 low-order of checkpoint update count */ |
166 | __u32 cp_events_hi; /* 10 high-order of checkpoint update count */ | |
64c4757e | 167 | #endif |
e5329c37 | 168 | __u32 recovery_cp; /* 11 recovery checkpoint sector count */ |
b674b5b8 NB |
169 | /* There are only valid for minor_version > 90 */ |
170 | __u64 reshape_position; /* 12,13 next address in array-space for reshape */ | |
171 | __u32 new_level; /* 14 new level we are reshaping to */ | |
172 | __u32 delta_disks; /* 15 change in number of raid_disks */ | |
173 | __u32 new_layout; /* 16 new layout */ | |
174 | __u32 new_chunk; /* 17 new chunk size (bytes) */ | |
175 | __u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18]; | |
64c4757e NB |
176 | |
177 | /* | |
178 | * Personality information | |
179 | */ | |
180 | __u32 layout; /* 0 the array's physical layout */ | |
181 | __u32 chunk_size; /* 1 chunk size in bytes */ | |
182 | __u32 root_pv; /* 2 LV root PV */ | |
183 | __u32 root_block; /* 3 LV root block */ | |
184 | __u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4]; | |
185 | ||
186 | /* | |
187 | * Disks information | |
188 | */ | |
189 | mdp_disk_t disks[MD_SB_DISKS]; | |
190 | ||
191 | /* | |
192 | * Reserved | |
193 | */ | |
194 | __u32 reserved[MD_SB_RESERVED_WORDS]; | |
195 | ||
196 | /* | |
197 | * Active descriptor | |
198 | */ | |
199 | mdp_disk_t this_disk; | |
200 | ||
201 | } mdp_super_t; | |
202 | ||
5787fa49 NB |
203 | #ifdef __TINYC__ |
204 | typedef unsigned long long __u64; | |
205 | #endif | |
206 | ||
64c4757e NB |
207 | static inline __u64 md_event(mdp_super_t *sb) { |
208 | __u64 ev = sb->events_hi; | |
209 | return (ev<<32)| sb->events_lo; | |
210 | } | |
211 | ||
cc1799c3 SL |
212 | struct r5l_payload_header { |
213 | __u16 type; | |
214 | __u16 flags; | |
215 | } __attribute__ ((__packed__)); | |
216 | ||
217 | enum r5l_payload_type { | |
218 | R5LOG_PAYLOAD_DATA = 0, | |
219 | R5LOG_PAYLOAD_PARITY = 1, | |
220 | R5LOG_PAYLOAD_FLUSH = 2, | |
221 | }; | |
222 | ||
223 | struct r5l_payload_data_parity { | |
224 | struct r5l_payload_header header; | |
225 | __u32 size; /* sector. data/parity size. each 4k has a checksum */ | |
226 | __u64 location; /* sector. For data, it's raid sector. For | |
227 | parity, it's stripe sector */ | |
228 | __u32 checksum[]; | |
229 | } __attribute__ ((__packed__)); | |
230 | ||
231 | enum r5l_payload_data_parity_flag { | |
232 | R5LOG_PAYLOAD_FLAG_DISCARD = 1, /* payload is discard */ | |
233 | /* | |
234 | * RESHAPED/RESHAPING is only set when there is reshape activity. Note, | |
235 | * both data/parity of a stripe should have the same flag set | |
236 | * | |
237 | * RESHAPED: reshape is running, and this stripe finished reshape | |
238 | * RESHAPING: reshape is running, and this stripe isn't reshaped | |
239 | * */ | |
240 | R5LOG_PAYLOAD_FLAG_RESHAPED = 2, | |
241 | R5LOG_PAYLOAD_FLAG_RESHAPING = 3, | |
242 | }; | |
243 | ||
244 | struct r5l_payload_flush { | |
245 | struct r5l_payload_header header; | |
246 | __u32 size; /* flush_stripes size, bytes */ | |
247 | __u64 flush_stripes[]; | |
248 | } __attribute__ ((__packed__)); | |
249 | ||
250 | enum r5l_payload_flush_flag { | |
251 | R5LOG_PAYLOAD_FLAG_FLUSH_STRIPE = 1, /* data represents whole stripe */ | |
252 | }; | |
253 | ||
254 | struct r5l_meta_block { | |
255 | __u32 magic; | |
256 | __u32 checksum; | |
257 | __u8 version; | |
258 | __u8 __zero_pading_1; | |
259 | __u16 __zero_pading_2; | |
260 | __u32 meta_size; /* whole size of the block */ | |
261 | ||
262 | __u64 seq; | |
263 | __u64 position; /* sector, start from rdev->data_offset, current position */ | |
264 | struct r5l_payload_header payloads[]; | |
265 | } __attribute__ ((__packed__)); | |
266 | ||
267 | #define R5LOG_VERSION 0x1 | |
268 | #define R5LOG_MAGIC 0x6433c509 | |
269 | ||
2432ce9b AP |
270 | struct ppl_header_entry { |
271 | __u64 data_sector; /* raid sector of the new data */ | |
272 | __u32 pp_size; /* length of partial parity */ | |
273 | __u32 data_size; /* length of data */ | |
274 | __u32 parity_disk; /* member disk containing parity */ | |
275 | __u32 checksum; /* checksum of this entry's partial parity */ | |
276 | } __attribute__ ((__packed__)); | |
277 | ||
278 | #define PPL_HEADER_SIZE 4096 | |
279 | #define PPL_HDR_RESERVED 512 | |
280 | #define PPL_HDR_ENTRY_SPACE \ | |
281 | (PPL_HEADER_SIZE - PPL_HDR_RESERVED - 4 * sizeof(__u32) - sizeof(__u64)) | |
282 | #define PPL_HDR_MAX_ENTRIES \ | |
283 | (PPL_HDR_ENTRY_SPACE / sizeof(struct ppl_header_entry)) | |
284 | ||
285 | struct ppl_header { | |
286 | __u8 reserved[PPL_HDR_RESERVED];/* reserved space, fill with 0xff */ | |
287 | __u32 signature; /* signature (family number of volume) */ | |
288 | __u32 padding; /* zero pad */ | |
289 | __u64 generation; /* generation number of the header */ | |
290 | __u32 entries_count; /* number of entries in entry array */ | |
291 | __u32 checksum; /* checksum of the header */ | |
292 | struct ppl_header_entry entries[PPL_HDR_MAX_ENTRIES]; | |
293 | } __attribute__ ((__packed__)); | |
294 | ||
aba69144 | 295 | #endif |