g_raid3.h (14604B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _G_RAID3_H_ 30 #define _G_RAID3_H_ 31 32 #include <sys/endian.h> 33 #include <sys/md5.h> 34 35 #define G_RAID3_CLASS_NAME "RAID3" 36 37 #define G_RAID3_MAGIC "GEOM::RAID3" 38 /* 39 * Version history: 40 * 0 - Initial version number. 41 * 1 - Added 'round-robin reading' algorithm. 42 * 2 - Added 'verify reading' algorithm. 43 * 3 - Added md_genid field to metadata. 44 * 4 - Added md_provsize field to metadata. 45 * 5 - Added 'no failure synchronization' flag. 46 */ 47 #define G_RAID3_VERSION 5 48 49 #define G_RAID3_DISK_FLAG_DIRTY 0x0000000000000001ULL 50 #define G_RAID3_DISK_FLAG_SYNCHRONIZING 0x0000000000000002ULL 51 #define G_RAID3_DISK_FLAG_FORCE_SYNC 0x0000000000000004ULL 52 #define G_RAID3_DISK_FLAG_HARDCODED 0x0000000000000008ULL 53 #define G_RAID3_DISK_FLAG_BROKEN 0x0000000000000010ULL 54 #define G_RAID3_DISK_FLAG_MASK (G_RAID3_DISK_FLAG_DIRTY | \ 55 G_RAID3_DISK_FLAG_SYNCHRONIZING | \ 56 G_RAID3_DISK_FLAG_FORCE_SYNC) 57 58 #define G_RAID3_DEVICE_FLAG_NOAUTOSYNC 0x0000000000000001ULL 59 #define G_RAID3_DEVICE_FLAG_ROUND_ROBIN 0x0000000000000002ULL 60 #define G_RAID3_DEVICE_FLAG_VERIFY 0x0000000000000004ULL 61 #define G_RAID3_DEVICE_FLAG_NOFAILSYNC 0x0000000000000008ULL 62 #define G_RAID3_DEVICE_FLAG_MASK (G_RAID3_DEVICE_FLAG_NOAUTOSYNC | \ 63 G_RAID3_DEVICE_FLAG_ROUND_ROBIN | \ 64 G_RAID3_DEVICE_FLAG_VERIFY | \ 65 G_RAID3_DEVICE_FLAG_NOFAILSYNC) 66 67 #ifdef _KERNEL 68 extern u_int g_raid3_debug; 69 70 #define G_RAID3_DEBUG(lvl, ...) \ 71 _GEOM_DEBUG("GEOM_RAID3", g_raid3_debug, (lvl), NULL, __VA_ARGS__) 72 #define G_RAID3_LOGREQ(lvl, bp, ...) \ 73 _GEOM_DEBUG("GEOM_RAID3", g_raid3_debug, (lvl), (bp), __VA_ARGS__) 74 75 #define G_RAID3_BIO_CFLAG_REGULAR 0x01 76 #define G_RAID3_BIO_CFLAG_SYNC 0x02 77 #define G_RAID3_BIO_CFLAG_PARITY 0x04 78 #define G_RAID3_BIO_CFLAG_NODISK 0x08 79 #define G_RAID3_BIO_CFLAG_REGSYNC 0x10 80 #define G_RAID3_BIO_CFLAG_MASK (G_RAID3_BIO_CFLAG_REGULAR | \ 81 G_RAID3_BIO_CFLAG_SYNC | \ 82 G_RAID3_BIO_CFLAG_PARITY | \ 83 G_RAID3_BIO_CFLAG_NODISK | \ 84 G_RAID3_BIO_CFLAG_REGSYNC) 85 86 #define G_RAID3_BIO_PFLAG_DEGRADED 0x01 87 #define G_RAID3_BIO_PFLAG_NOPARITY 0x02 88 #define G_RAID3_BIO_PFLAG_VERIFY 0x04 89 #define G_RAID3_BIO_PFLAG_MASK (G_RAID3_BIO_PFLAG_DEGRADED | \ 90 G_RAID3_BIO_PFLAG_NOPARITY | \ 91 G_RAID3_BIO_PFLAG_VERIFY) 92 93 /* 94 * Informations needed for synchronization. 95 */ 96 struct g_raid3_disk_sync { 97 struct g_consumer *ds_consumer; /* Consumer connected to our device. */ 98 off_t ds_offset; /* Offset of next request to send. */ 99 off_t ds_offset_done; /* Offset of already synchronized 100 region. */ 101 off_t ds_resync; /* Resynchronize from this offset. */ 102 u_int ds_syncid; /* Disk's synchronization ID. */ 103 u_int ds_inflight; /* Number of in-flight sync requests. */ 104 struct bio **ds_bios; /* BIOs for synchronization I/O. */ 105 }; 106 107 /* 108 * Informations needed for synchronization. 109 */ 110 struct g_raid3_device_sync { 111 struct g_geom *ds_geom; /* Synchronization geom. */ 112 }; 113 114 #define G_RAID3_DISK_STATE_NODISK 0 115 #define G_RAID3_DISK_STATE_NONE 1 116 #define G_RAID3_DISK_STATE_NEW 2 117 #define G_RAID3_DISK_STATE_ACTIVE 3 118 #define G_RAID3_DISK_STATE_STALE 4 119 #define G_RAID3_DISK_STATE_SYNCHRONIZING 5 120 #define G_RAID3_DISK_STATE_DISCONNECTED 6 121 #define G_RAID3_DISK_STATE_DESTROY 7 122 struct g_raid3_disk { 123 u_int d_no; /* Disk number. */ 124 struct g_consumer *d_consumer; /* Consumer. */ 125 struct g_raid3_softc *d_softc; /* Back-pointer to softc. */ 126 int d_state; /* Disk state. */ 127 uint64_t d_flags; /* Additional flags. */ 128 u_int d_genid; /* Disk's generation ID. */ 129 struct g_raid3_disk_sync d_sync; /* Sync information. */ 130 LIST_ENTRY(g_raid3_disk) d_next; 131 }; 132 #define d_name d_consumer->provider->name 133 134 #define G_RAID3_EVENT_DONTWAIT 0x1 135 #define G_RAID3_EVENT_WAIT 0x2 136 #define G_RAID3_EVENT_DEVICE 0x4 137 #define G_RAID3_EVENT_DONE 0x8 138 struct g_raid3_event { 139 struct g_raid3_disk *e_disk; 140 int e_state; 141 int e_flags; 142 int e_error; 143 TAILQ_ENTRY(g_raid3_event) e_next; 144 }; 145 146 #define G_RAID3_DEVICE_FLAG_DESTROY 0x0100000000000000ULL 147 #define G_RAID3_DEVICE_FLAG_WAIT 0x0200000000000000ULL 148 #define G_RAID3_DEVICE_FLAG_DESTROYING 0x0400000000000000ULL 149 150 #define G_RAID3_DEVICE_STATE_STARTING 0 151 #define G_RAID3_DEVICE_STATE_DEGRADED 1 152 #define G_RAID3_DEVICE_STATE_COMPLETE 2 153 154 /* Bump syncid on first write. */ 155 #define G_RAID3_BUMP_SYNCID 0x1 156 /* Bump genid immediately. */ 157 #define G_RAID3_BUMP_GENID 0x2 158 159 enum g_raid3_zones { 160 G_RAID3_ZONE_64K, 161 G_RAID3_ZONE_16K, 162 G_RAID3_ZONE_4K, 163 G_RAID3_NUM_ZONES 164 }; 165 166 static __inline enum g_raid3_zones 167 g_raid3_zone(size_t nbytes) { 168 if (nbytes > 65536) 169 return (G_RAID3_NUM_ZONES); 170 else if (nbytes > 16384) 171 return (G_RAID3_ZONE_64K); 172 else if (nbytes > 4096) 173 return (G_RAID3_ZONE_16K); 174 else 175 return (G_RAID3_ZONE_4K); 176 }; 177 178 struct g_raid3_softc { 179 u_int sc_state; /* Device state. */ 180 uint64_t sc_mediasize; /* Device size. */ 181 uint32_t sc_sectorsize; /* Sector size. */ 182 uint64_t sc_flags; /* Additional flags. */ 183 184 struct g_geom *sc_geom; 185 struct g_provider *sc_provider; 186 187 uint32_t sc_id; /* Device unique ID. */ 188 189 struct sx sc_lock; 190 struct bio_queue_head sc_queue; 191 struct mtx sc_queue_mtx; 192 struct proc *sc_worker; 193 struct bio_queue_head sc_regular_delayed; /* Delayed I/O requests due 194 collision with sync 195 requests. */ 196 struct bio_queue_head sc_inflight; /* In-flight regular write 197 requests. */ 198 struct bio_queue_head sc_sync_delayed; /* Delayed sync requests due 199 collision with regular 200 requests. */ 201 202 struct g_raid3_disk *sc_disks; 203 u_int sc_ndisks; /* Number of disks. */ 204 u_int sc_round_robin; 205 struct g_raid3_disk *sc_syncdisk; 206 207 struct g_raid3_zone { 208 uma_zone_t sz_zone; 209 size_t sz_inuse; 210 size_t sz_max; 211 u_int sz_requested; 212 u_int sz_failed; 213 } sc_zones[G_RAID3_NUM_ZONES]; 214 215 u_int sc_genid; /* Generation ID. */ 216 u_int sc_syncid; /* Synchronization ID. */ 217 int sc_bump_id; 218 struct g_raid3_device_sync sc_sync; 219 int sc_idle; /* DIRTY flags removed. */ 220 time_t sc_last_write; 221 u_int sc_writes; 222 u_int sc_refcnt; /* Number of softc references. */ 223 224 TAILQ_HEAD(, g_raid3_event) sc_events; 225 struct mtx sc_events_mtx; 226 struct g_raid3_event *sc_timeout_event; 227 228 struct callout sc_callout; 229 230 struct root_hold_token *sc_rootmount; 231 }; 232 #define sc_name sc_geom->name 233 234 const char *g_raid3_get_diskname(struct g_raid3_disk *disk); 235 u_int g_raid3_ndisks(struct g_raid3_softc *sc, int state); 236 #define G_RAID3_DESTROY_SOFT 0 237 #define G_RAID3_DESTROY_DELAYED 1 238 #define G_RAID3_DESTROY_HARD 2 239 int g_raid3_destroy(struct g_raid3_softc *sc, int how); 240 int g_raid3_event_send(void *arg, int state, int flags); 241 struct g_raid3_metadata; 242 int g_raid3_add_disk(struct g_raid3_softc *sc, struct g_provider *pp, 243 struct g_raid3_metadata *md); 244 int g_raid3_read_metadata(struct g_consumer *cp, struct g_raid3_metadata *md); 245 void g_raid3_fill_metadata(struct g_raid3_disk *disk, 246 struct g_raid3_metadata *md); 247 int g_raid3_clear_metadata(struct g_raid3_disk *disk); 248 void g_raid3_update_metadata(struct g_raid3_disk *disk); 249 250 g_ctl_req_t g_raid3_config; 251 #endif /* _KERNEL */ 252 253 struct g_raid3_metadata { 254 char md_magic[16]; /* Magic value. */ 255 uint32_t md_version; /* Version number. */ 256 char md_name[16]; /* Device name. */ 257 uint32_t md_id; /* Device unique ID. */ 258 uint16_t md_no; /* Component number. */ 259 uint16_t md_all; /* Number of disks in device. */ 260 uint32_t md_genid; /* Generation ID. */ 261 uint32_t md_syncid; /* Synchronization ID. */ 262 uint64_t md_mediasize; /* Size of whole device. */ 263 uint32_t md_sectorsize; /* Sector size. */ 264 uint64_t md_sync_offset; /* Synchronized offset. */ 265 uint64_t md_mflags; /* Additional device flags. */ 266 uint64_t md_dflags; /* Additional disk flags. */ 267 char md_provider[16]; /* Hardcoded provider. */ 268 uint64_t md_provsize; /* Provider's size. */ 269 u_char md_hash[16]; /* MD5 hash. */ 270 }; 271 static __inline void 272 raid3_metadata_encode(struct g_raid3_metadata *md, u_char *data) 273 { 274 MD5_CTX ctx; 275 276 bcopy(md->md_magic, data, 16); 277 le32enc(data + 16, md->md_version); 278 bcopy(md->md_name, data + 20, 16); 279 le32enc(data + 36, md->md_id); 280 le16enc(data + 40, md->md_no); 281 le16enc(data + 42, md->md_all); 282 le32enc(data + 44, md->md_genid); 283 le32enc(data + 48, md->md_syncid); 284 le64enc(data + 52, md->md_mediasize); 285 le32enc(data + 60, md->md_sectorsize); 286 le64enc(data + 64, md->md_sync_offset); 287 le64enc(data + 72, md->md_mflags); 288 le64enc(data + 80, md->md_dflags); 289 bcopy(md->md_provider, data + 88, 16); 290 le64enc(data + 104, md->md_provsize); 291 MD5Init(&ctx); 292 MD5Update(&ctx, data, 112); 293 MD5Final(md->md_hash, &ctx); 294 bcopy(md->md_hash, data + 112, 16); 295 } 296 static __inline int 297 raid3_metadata_decode_v0v1v2(const u_char *data, struct g_raid3_metadata *md) 298 { 299 MD5_CTX ctx; 300 301 bcopy(data + 20, md->md_name, 16); 302 md->md_id = le32dec(data + 36); 303 md->md_no = le16dec(data + 40); 304 md->md_all = le16dec(data + 42); 305 md->md_syncid = le32dec(data + 44); 306 md->md_mediasize = le64dec(data + 48); 307 md->md_sectorsize = le32dec(data + 56); 308 md->md_sync_offset = le64dec(data + 60); 309 md->md_mflags = le64dec(data + 68); 310 md->md_dflags = le64dec(data + 76); 311 bcopy(data + 84, md->md_provider, 16); 312 bcopy(data + 100, md->md_hash, 16); 313 MD5Init(&ctx); 314 MD5Update(&ctx, data, 100); 315 MD5Final(md->md_hash, &ctx); 316 if (bcmp(md->md_hash, data + 100, 16) != 0) 317 return (EINVAL); 318 319 /* New fields. */ 320 md->md_genid = 0; 321 md->md_provsize = 0; 322 323 return (0); 324 } 325 static __inline int 326 raid3_metadata_decode_v3(const u_char *data, struct g_raid3_metadata *md) 327 { 328 MD5_CTX ctx; 329 330 bcopy(data + 20, md->md_name, 16); 331 md->md_id = le32dec(data + 36); 332 md->md_no = le16dec(data + 40); 333 md->md_all = le16dec(data + 42); 334 md->md_genid = le32dec(data + 44); 335 md->md_syncid = le32dec(data + 48); 336 md->md_mediasize = le64dec(data + 52); 337 md->md_sectorsize = le32dec(data + 60); 338 md->md_sync_offset = le64dec(data + 64); 339 md->md_mflags = le64dec(data + 72); 340 md->md_dflags = le64dec(data + 80); 341 bcopy(data + 88, md->md_provider, 16); 342 bcopy(data + 104, md->md_hash, 16); 343 MD5Init(&ctx); 344 MD5Update(&ctx, data, 104); 345 MD5Final(md->md_hash, &ctx); 346 if (bcmp(md->md_hash, data + 104, 16) != 0) 347 return (EINVAL); 348 349 /* New fields. */ 350 md->md_provsize = 0; 351 352 return (0); 353 } 354 static __inline int 355 raid3_metadata_decode_v4v5(const u_char *data, struct g_raid3_metadata *md) 356 { 357 MD5_CTX ctx; 358 359 bcopy(data + 20, md->md_name, 16); 360 md->md_id = le32dec(data + 36); 361 md->md_no = le16dec(data + 40); 362 md->md_all = le16dec(data + 42); 363 md->md_genid = le32dec(data + 44); 364 md->md_syncid = le32dec(data + 48); 365 md->md_mediasize = le64dec(data + 52); 366 md->md_sectorsize = le32dec(data + 60); 367 md->md_sync_offset = le64dec(data + 64); 368 md->md_mflags = le64dec(data + 72); 369 md->md_dflags = le64dec(data + 80); 370 bcopy(data + 88, md->md_provider, 16); 371 md->md_provsize = le64dec(data + 104); 372 bcopy(data + 112, md->md_hash, 16); 373 MD5Init(&ctx); 374 MD5Update(&ctx, data, 112); 375 MD5Final(md->md_hash, &ctx); 376 if (bcmp(md->md_hash, data + 112, 16) != 0) 377 return (EINVAL); 378 return (0); 379 } 380 static __inline int 381 raid3_metadata_decode(const u_char *data, struct g_raid3_metadata *md) 382 { 383 int error; 384 385 bcopy(data, md->md_magic, 16); 386 md->md_version = le32dec(data + 16); 387 switch (md->md_version) { 388 case 0: 389 case 1: 390 case 2: 391 error = raid3_metadata_decode_v0v1v2(data, md); 392 break; 393 case 3: 394 error = raid3_metadata_decode_v3(data, md); 395 break; 396 case 4: 397 case 5: 398 error = raid3_metadata_decode_v4v5(data, md); 399 break; 400 default: 401 error = EINVAL; 402 break; 403 } 404 return (error); 405 } 406 407 static __inline void 408 raid3_metadata_dump(const struct g_raid3_metadata *md) 409 { 410 static const char hex[] = "0123456789abcdef"; 411 char hash[16 * 2 + 1]; 412 u_int i; 413 414 printf(" magic: %s\n", md->md_magic); 415 printf(" version: %u\n", (u_int)md->md_version); 416 printf(" name: %s\n", md->md_name); 417 printf(" id: %u\n", (u_int)md->md_id); 418 printf(" no: %u\n", (u_int)md->md_no); 419 printf(" all: %u\n", (u_int)md->md_all); 420 printf(" genid: %u\n", (u_int)md->md_genid); 421 printf(" syncid: %u\n", (u_int)md->md_syncid); 422 printf(" mediasize: %jd\n", (intmax_t)md->md_mediasize); 423 printf("sectorsize: %u\n", (u_int)md->md_sectorsize); 424 printf("syncoffset: %jd\n", (intmax_t)md->md_sync_offset); 425 printf(" mflags:"); 426 if (md->md_mflags == 0) 427 printf(" NONE"); 428 else { 429 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) != 0) 430 printf(" NOAUTOSYNC"); 431 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0) 432 printf(" ROUND-ROBIN"); 433 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_VERIFY) != 0) 434 printf(" VERIFY"); 435 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0) 436 printf(" NOFAILSYNC"); 437 } 438 printf("\n"); 439 printf(" dflags:"); 440 if (md->md_dflags == 0) 441 printf(" NONE"); 442 else { 443 if ((md->md_dflags & G_RAID3_DISK_FLAG_DIRTY) != 0) 444 printf(" DIRTY"); 445 if ((md->md_dflags & G_RAID3_DISK_FLAG_SYNCHRONIZING) != 0) 446 printf(" SYNCHRONIZING"); 447 if ((md->md_dflags & G_RAID3_DISK_FLAG_FORCE_SYNC) != 0) 448 printf(" FORCE_SYNC"); 449 } 450 printf("\n"); 451 printf("hcprovider: %s\n", md->md_provider); 452 printf(" provsize: %ju\n", (uintmax_t)md->md_provsize); 453 bzero(hash, sizeof(hash)); 454 for (i = 0; i < 16; i++) { 455 hash[i * 2] = hex[md->md_hash[i] >> 4]; 456 hash[i * 2 + 1] = hex[md->md_hash[i] & 0x0f]; 457 } 458 printf(" MD5 hash: %s\n", hash); 459 } 460 #endif /* !_G_RAID3_H_ */