1 /*- 2 * Copyright (c) 2012 Alexander Motin <mav@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bio.h> 32 #include <sys/endian.h> 33 #include <sys/kernel.h> 34 #include <sys/kobj.h> 35 #include <sys/limits.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/sysctl.h> 40 #include <sys/systm.h> 41 #include <geom/geom.h> 42 #include "geom/raid/g_raid.h" 43 #include "g_raid_tr_if.h" 44 45 SYSCTL_DECL(_kern_geom_raid); 46 47 static MALLOC_DEFINE(M_TR_RAID5, "tr_raid5_data", "GEOM_RAID RAID5 data"); 48 49 #define TR_RAID5_NONE 0 50 #define TR_RAID5_REBUILD 1 51 #define TR_RAID5_RESYNC 2 52 53 #define TR_RAID5_F_DOING_SOME 0x1 54 #define TR_RAID5_F_LOCKED 0x2 55 #define TR_RAID5_F_ABORT 0x4 56 57 struct g_raid_tr_raid5_object { 58 struct g_raid_tr_object trso_base; 59 int trso_starting; 60 int trso_stopping; 61 int trso_type; 62 int trso_recover_slabs; /* slabs before rest */ 63 int trso_fair_io; 64 int trso_meta_update; 65 int trso_flags; 66 struct g_raid_subdisk *trso_failed_sd; /* like per volume */ 67 void *trso_buffer; /* Buffer space */ 68 struct bio trso_bio; 69 }; 70 71 static g_raid_tr_taste_t g_raid_tr_taste_raid5; 72 static g_raid_tr_event_t g_raid_tr_event_raid5; 73 static g_raid_tr_start_t g_raid_tr_start_raid5; 74 static g_raid_tr_stop_t g_raid_tr_stop_raid5; 75 static g_raid_tr_iostart_t g_raid_tr_iostart_raid5; 76 static g_raid_tr_iodone_t g_raid_tr_iodone_raid5; 77 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid5; 78 static g_raid_tr_locked_t g_raid_tr_locked_raid5; 79 static g_raid_tr_free_t g_raid_tr_free_raid5; 80 81 static kobj_method_t g_raid_tr_raid5_methods[] = { 82 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid5), 83 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid5), 84 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid5), 85 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid5), 86 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid5), 87 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid5), 88 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid5), 89 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid5), 90 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid5), 91 { 0, 0 } 92 }; 93 94 static struct g_raid_tr_class g_raid_tr_raid5_class = { 95 "RAID5", 96 g_raid_tr_raid5_methods, 97 sizeof(struct g_raid_tr_raid5_object), 98 .trc_priority = 100 99 }; 100 101 static int 102 g_raid_tr_taste_raid5(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 103 { 104 struct g_raid_tr_raid5_object *trs; 105 u_int qual; 106 107 trs = (struct g_raid_tr_raid5_object *)tr; 108 qual = tr->tro_volume->v_raid_level_qualifier; 109 if (tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID4 && 110 qual >= 0 && qual <= 1) { 111 /* RAID4 */ 112 } else if ((tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5 || 113 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5E || 114 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5EE || 115 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5R || 116 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID6 || 117 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAIDMDF) && 118 qual >= 0 && qual <= 3) { 119 /* RAID5/5E/5EE/5R/6/MDF */ 120 } else 121 return (G_RAID_TR_TASTE_FAIL); 122 trs->trso_starting = 1; 123 return (G_RAID_TR_TASTE_SUCCEED); 124 } 125 126 static int 127 g_raid_tr_update_state_raid5(struct g_raid_volume *vol, 128 struct g_raid_subdisk *sd) 129 { 130 struct g_raid_tr_raid5_object *trs; 131 struct g_raid_softc *sc; 132 u_int s; 133 int na, ns, nu; 134 135 sc = vol->v_softc; 136 trs = (struct g_raid_tr_raid5_object *)vol->v_tr; 137 if (trs->trso_stopping && 138 (trs->trso_flags & TR_RAID5_F_DOING_SOME) == 0) 139 s = G_RAID_VOLUME_S_STOPPED; 140 else if (trs->trso_starting) 141 s = G_RAID_VOLUME_S_STARTING; 142 else { 143 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 144 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 145 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 146 nu = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 147 if (na == vol->v_disks_count) 148 s = G_RAID_VOLUME_S_OPTIMAL; 149 else if (na + ns == vol->v_disks_count || 150 na + ns + nu == vol->v_disks_count /* XXX: Temporary. */) 151 s = G_RAID_VOLUME_S_SUBOPTIMAL; 152 else if (na == vol->v_disks_count - 1 || 153 na + ns + nu == vol->v_disks_count) 154 s = G_RAID_VOLUME_S_DEGRADED; 155 else 156 s = G_RAID_VOLUME_S_BROKEN; 157 } 158 if (s != vol->v_state) { 159 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 160 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 161 G_RAID_EVENT_VOLUME); 162 g_raid_change_volume_state(vol, s); 163 if (!trs->trso_starting && !trs->trso_stopping) 164 g_raid_write_metadata(sc, vol, NULL, NULL); 165 } 166 return (0); 167 } 168 169 static int 170 g_raid_tr_event_raid5(struct g_raid_tr_object *tr, 171 struct g_raid_subdisk *sd, u_int event) 172 { 173 174 g_raid_tr_update_state_raid5(tr->tro_volume, sd); 175 return (0); 176 } 177 178 static int 179 g_raid_tr_start_raid5(struct g_raid_tr_object *tr) 180 { 181 struct g_raid_tr_raid5_object *trs; 182 struct g_raid_volume *vol; 183 184 trs = (struct g_raid_tr_raid5_object *)tr; 185 vol = tr->tro_volume; 186 trs->trso_starting = 0; 187 g_raid_tr_update_state_raid5(vol, NULL); 188 return (0); 189 } 190 191 static int 192 g_raid_tr_stop_raid5(struct g_raid_tr_object *tr) 193 { 194 struct g_raid_tr_raid5_object *trs; 195 struct g_raid_volume *vol; 196 197 trs = (struct g_raid_tr_raid5_object *)tr; 198 vol = tr->tro_volume; 199 trs->trso_starting = 0; 200 trs->trso_stopping = 1; 201 g_raid_tr_update_state_raid5(vol, NULL); 202 return (0); 203 } 204 205 static void 206 g_raid_tr_iostart_raid5_read(struct g_raid_tr_object *tr, struct bio *bp) 207 { 208 struct g_raid_volume *vol; 209 struct g_raid_subdisk *sd; 210 struct bio_queue_head queue; 211 struct bio *cbp; 212 char *addr; 213 off_t offset, start, length, nstripe, remain; 214 int no, pno, ddisks, pdisks, protate, pleft; 215 u_int strip_size, lvl, qual; 216 217 vol = tr->tro_volume; 218 addr = bp->bio_data; 219 strip_size = vol->v_strip_size; 220 lvl = tr->tro_volume->v_raid_level; 221 qual = tr->tro_volume->v_raid_level_qualifier; 222 protate = tr->tro_volume->v_rotate_parity; 223 224 /* Stripe number. */ 225 nstripe = bp->bio_offset / strip_size; 226 /* Start position in stripe. */ 227 start = bp->bio_offset % strip_size; 228 /* Number of data and parity disks. */ 229 if (lvl == G_RAID_VOLUME_RL_RAIDMDF) 230 pdisks = tr->tro_volume->v_mdf_pdisks; 231 else if (lvl == G_RAID_VOLUME_RL_RAID5EE || 232 lvl == G_RAID_VOLUME_RL_RAID6) 233 pdisks = 2; 234 else 235 pdisks = 1; 236 ddisks = vol->v_disks_count - pdisks; 237 /* Parity disk number. */ 238 if (lvl == G_RAID_VOLUME_RL_RAID4) { 239 if (qual == 0) /* P0 */ 240 pno = 0; 241 else /* PN */ 242 pno = ddisks; 243 pleft = -1; 244 } else { 245 pno = (nstripe / (ddisks * protate)) % vol->v_disks_count; 246 pleft = protate - (nstripe / ddisks) % protate; 247 if (qual >= 2) { /* PN/Left */ 248 pno = ddisks - pno; 249 if (pno < 0) 250 pno += vol->v_disks_count; 251 } 252 } 253 /* Data disk number. */ 254 no = nstripe % ddisks; 255 if (lvl == G_RAID_VOLUME_RL_RAID4) { 256 if (qual == 0) 257 no += pdisks; 258 } else if (qual & 1) { /* Continuation/Symmetric */ 259 no = (pno + pdisks + no) % vol->v_disks_count; 260 } else if (no >= pno) /* Restart/Asymmetric */ 261 no += pdisks; 262 else 263 no += imax(0, pno + pdisks - vol->v_disks_count); 264 /* Stripe start position in disk. */ 265 offset = (nstripe / ddisks) * strip_size; 266 /* Length of data to operate. */ 267 remain = bp->bio_length; 268 269 bioq_init(&queue); 270 do { 271 length = MIN(strip_size - start, remain); 272 cbp = g_clone_bio(bp); 273 if (cbp == NULL) 274 goto failure; 275 cbp->bio_offset = offset + start; 276 cbp->bio_data = addr; 277 cbp->bio_length = length; 278 cbp->bio_caller1 = &vol->v_subdisks[no]; 279 bioq_insert_tail(&queue, cbp); 280 no++; 281 if (lvl == G_RAID_VOLUME_RL_RAID4) { 282 no %= vol->v_disks_count; 283 if (no == pno) 284 no = (no + pdisks) % vol->v_disks_count; 285 } else if (qual & 1) { /* Continuation/Symmetric */ 286 no %= vol->v_disks_count; 287 if (no == pno) { 288 if ((--pleft) <= 0) { 289 pleft += protate; 290 if (qual < 2) /* P0/Right */ 291 pno++; 292 else /* PN/Left */ 293 pno += vol->v_disks_count - 1; 294 pno %= vol->v_disks_count; 295 } 296 no = (pno + pdisks) % vol->v_disks_count; 297 offset += strip_size; 298 } 299 } else { /* Restart/Asymmetric */ 300 if (no == pno) 301 no += pdisks; 302 if (no >= vol->v_disks_count) { 303 no -= vol->v_disks_count; 304 if ((--pleft) <= 0) { 305 pleft += protate; 306 if (qual < 2) /* P0/Right */ 307 pno++; 308 else /* PN/Left */ 309 pno += vol->v_disks_count - 1; 310 pno %= vol->v_disks_count; 311 } 312 if (no == pno) 313 no += pdisks; 314 else 315 no += imax(0, pno + pdisks - vol->v_disks_count); 316 offset += strip_size; 317 } 318 } 319 remain -= length; 320 addr += length; 321 start = 0; 322 } while (remain > 0); 323 for (cbp = bioq_first(&queue); cbp != NULL; 324 cbp = bioq_first(&queue)) { 325 bioq_remove(&queue, cbp); 326 sd = cbp->bio_caller1; 327 cbp->bio_caller1 = NULL; 328 g_raid_subdisk_iostart(sd, cbp); 329 } 330 return; 331 failure: 332 for (cbp = bioq_first(&queue); cbp != NULL; 333 cbp = bioq_first(&queue)) { 334 bioq_remove(&queue, cbp); 335 g_destroy_bio(cbp); 336 } 337 if (bp->bio_error == 0) 338 bp->bio_error = ENOMEM; 339 g_raid_iodone(bp, bp->bio_error); 340 } 341 342 static void 343 g_raid_tr_iostart_raid5(struct g_raid_tr_object *tr, struct bio *bp) 344 { 345 struct g_raid_volume *vol; 346 struct g_raid_tr_raid5_object *trs; 347 348 vol = tr->tro_volume; 349 trs = (struct g_raid_tr_raid5_object *)tr; 350 if (vol->v_state < G_RAID_VOLUME_S_SUBOPTIMAL) { 351 g_raid_iodone(bp, EIO); 352 return; 353 } 354 switch (bp->bio_cmd) { 355 case BIO_READ: 356 g_raid_tr_iostart_raid5_read(tr, bp); 357 break; 358 case BIO_WRITE: 359 case BIO_DELETE: 360 case BIO_FLUSH: 361 g_raid_iodone(bp, ENODEV); 362 break; 363 default: 364 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 365 bp->bio_cmd, vol->v_name)); 366 break; 367 } 368 } 369 370 static void 371 g_raid_tr_iodone_raid5(struct g_raid_tr_object *tr, 372 struct g_raid_subdisk *sd, struct bio *bp) 373 { 374 struct bio *pbp; 375 int error; 376 377 pbp = bp->bio_parent; 378 pbp->bio_inbed++; 379 error = bp->bio_error; 380 g_destroy_bio(bp); 381 if (pbp->bio_children == pbp->bio_inbed) { 382 pbp->bio_completed = pbp->bio_length; 383 g_raid_iodone(pbp, error); 384 } 385 } 386 387 static int 388 g_raid_tr_kerneldump_raid5(struct g_raid_tr_object *tr, 389 void *virtual, vm_offset_t physical, off_t offset, size_t length) 390 { 391 392 return (ENODEV); 393 } 394 395 static int 396 g_raid_tr_locked_raid5(struct g_raid_tr_object *tr, void *argp) 397 { 398 struct bio *bp; 399 struct g_raid_subdisk *sd; 400 401 bp = (struct bio *)argp; 402 sd = (struct g_raid_subdisk *)bp->bio_caller1; 403 g_raid_subdisk_iostart(sd, bp); 404 405 return (0); 406 } 407 408 static int 409 g_raid_tr_free_raid5(struct g_raid_tr_object *tr) 410 { 411 struct g_raid_tr_raid5_object *trs; 412 413 trs = (struct g_raid_tr_raid5_object *)tr; 414 415 if (trs->trso_buffer != NULL) { 416 free(trs->trso_buffer, M_TR_RAID5); 417 trs->trso_buffer = NULL; 418 } 419 return (0); 420 } 421 422 G_RAID_TR_DECLARE(g_raid_tr_raid5); 423