Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/raid/tr_raid5.c
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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: releng/9.1/sys/geom/raid/tr_raid5.c 240558 2012-09-16 11:02:22Z mav $"); 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 static MALLOC_DEFINE(M_TR_RAID5, "tr_raid5_data", "GEOM_RAID RAID5 data"); 46 47 #define TR_RAID5_NONE 0 48 #define TR_RAID5_REBUILD 1 49 #define TR_RAID5_RESYNC 2 50 51 #define TR_RAID5_F_DOING_SOME 0x1 52 #define TR_RAID5_F_LOCKED 0x2 53 #define TR_RAID5_F_ABORT 0x4 54 55 struct g_raid_tr_raid5_object { 56 struct g_raid_tr_object trso_base; 57 int trso_starting; 58 int trso_stopping; 59 int trso_type; 60 int trso_recover_slabs; /* slabs before rest */ 61 int trso_fair_io; 62 int trso_meta_update; 63 int trso_flags; 64 struct g_raid_subdisk *trso_failed_sd; /* like per volume */ 65 void *trso_buffer; /* Buffer space */ 66 struct bio trso_bio; 67 }; 68 69 static g_raid_tr_taste_t g_raid_tr_taste_raid5; 70 static g_raid_tr_event_t g_raid_tr_event_raid5; 71 static g_raid_tr_start_t g_raid_tr_start_raid5; 72 static g_raid_tr_stop_t g_raid_tr_stop_raid5; 73 static g_raid_tr_iostart_t g_raid_tr_iostart_raid5; 74 static g_raid_tr_iodone_t g_raid_tr_iodone_raid5; 75 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid5; 76 static g_raid_tr_locked_t g_raid_tr_locked_raid5; 77 static g_raid_tr_free_t g_raid_tr_free_raid5; 78 79 static kobj_method_t g_raid_tr_raid5_methods[] = { 80 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid5), 81 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid5), 82 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid5), 83 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid5), 84 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid5), 85 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid5), 86 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid5), 87 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid5), 88 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid5), 89 { 0, 0 } 90 }; 91 92 static struct g_raid_tr_class g_raid_tr_raid5_class = { 93 "RAID5", 94 g_raid_tr_raid5_methods, 95 sizeof(struct g_raid_tr_raid5_object), 96 .trc_enable = 1, 97 .trc_priority = 100 98 }; 99 100 static int 101 g_raid_tr_taste_raid5(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 102 { 103 struct g_raid_tr_raid5_object *trs; 104 u_int qual; 105 106 trs = (struct g_raid_tr_raid5_object *)tr; 107 qual = tr->tro_volume->v_raid_level_qualifier; 108 if (tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID4 && 109 qual >= 0 && qual <= 1) { 110 /* RAID4 */ 111 } else if ((tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5 || 112 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5E || 113 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5EE || 114 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5R || 115 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID6 || 116 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAIDMDF) && 117 qual >= 0 && qual <= 3) { 118 /* RAID5/5E/5EE/5R/6/MDF */ 119 } else 120 return (G_RAID_TR_TASTE_FAIL); 121 trs->trso_starting = 1; 122 return (G_RAID_TR_TASTE_SUCCEED); 123 } 124 125 static int 126 g_raid_tr_update_state_raid5(struct g_raid_volume *vol, 127 struct g_raid_subdisk *sd) 128 { 129 struct g_raid_tr_raid5_object *trs; 130 struct g_raid_softc *sc; 131 u_int s; 132 int na, ns, nu; 133 134 sc = vol->v_softc; 135 trs = (struct g_raid_tr_raid5_object *)vol->v_tr; 136 if (trs->trso_stopping && 137 (trs->trso_flags & TR_RAID5_F_DOING_SOME) == 0) 138 s = G_RAID_VOLUME_S_STOPPED; 139 else if (trs->trso_starting) 140 s = G_RAID_VOLUME_S_STARTING; 141 else { 142 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 143 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 144 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 145 nu = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 146 if (na == vol->v_disks_count) 147 s = G_RAID_VOLUME_S_OPTIMAL; 148 else if (na + ns == vol->v_disks_count || 149 na + ns + nu == vol->v_disks_count /* XXX: Temporary. */) 150 s = G_RAID_VOLUME_S_SUBOPTIMAL; 151 else if (na == vol->v_disks_count - 1 || 152 na + ns + nu == vol->v_disks_count) 153 s = G_RAID_VOLUME_S_DEGRADED; 154 else 155 s = G_RAID_VOLUME_S_BROKEN; 156 } 157 if (s != vol->v_state) { 158 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 159 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 160 G_RAID_EVENT_VOLUME); 161 g_raid_change_volume_state(vol, s); 162 if (!trs->trso_starting && !trs->trso_stopping) 163 g_raid_write_metadata(sc, vol, NULL, NULL); 164 } 165 return (0); 166 } 167 168 static int 169 g_raid_tr_event_raid5(struct g_raid_tr_object *tr, 170 struct g_raid_subdisk *sd, u_int event) 171 { 172 173 g_raid_tr_update_state_raid5(tr->tro_volume, sd); 174 return (0); 175 } 176 177 static int 178 g_raid_tr_start_raid5(struct g_raid_tr_object *tr) 179 { 180 struct g_raid_tr_raid5_object *trs; 181 struct g_raid_volume *vol; 182 183 trs = (struct g_raid_tr_raid5_object *)tr; 184 vol = tr->tro_volume; 185 trs->trso_starting = 0; 186 g_raid_tr_update_state_raid5(vol, NULL); 187 return (0); 188 } 189 190 static int 191 g_raid_tr_stop_raid5(struct g_raid_tr_object *tr) 192 { 193 struct g_raid_tr_raid5_object *trs; 194 struct g_raid_volume *vol; 195 196 trs = (struct g_raid_tr_raid5_object *)tr; 197 vol = tr->tro_volume; 198 trs->trso_starting = 0; 199 trs->trso_stopping = 1; 200 g_raid_tr_update_state_raid5(vol, NULL); 201 return (0); 202 } 203 204 static void 205 g_raid_tr_iostart_raid5_read(struct g_raid_tr_object *tr, struct bio *bp) 206 { 207 struct g_raid_volume *vol; 208 struct g_raid_subdisk *sd; 209 struct bio_queue_head queue; 210 struct bio *cbp; 211 char *addr; 212 off_t offset, start, length, nstripe, remain; 213 int no, pno, ddisks, pdisks, protate, pleft; 214 u_int strip_size, lvl, qual; 215 216 vol = tr->tro_volume; 217 addr = bp->bio_data; 218 strip_size = vol->v_strip_size; 219 lvl = tr->tro_volume->v_raid_level; 220 qual = tr->tro_volume->v_raid_level_qualifier; 221 protate = tr->tro_volume->v_rotate_parity; 222 223 /* Stripe number. */ 224 nstripe = bp->bio_offset / strip_size; 225 /* Start position in stripe. */ 226 start = bp->bio_offset % strip_size; 227 /* Number of data and parity disks. */ 228 if (lvl == G_RAID_VOLUME_RL_RAIDMDF) 229 pdisks = tr->tro_volume->v_mdf_pdisks; 230 else if (lvl == G_RAID_VOLUME_RL_RAID5EE || 231 lvl == G_RAID_VOLUME_RL_RAID6) 232 pdisks = 2; 233 else 234 pdisks = 1; 235 ddisks = vol->v_disks_count - pdisks; 236 /* Parity disk number. */ 237 if (lvl == G_RAID_VOLUME_RL_RAID4) { 238 if (qual == 0) /* P0 */ 239 pno = 0; 240 else /* PN */ 241 pno = ddisks; 242 pleft = -1; 243 } else { 244 pno = (nstripe / (ddisks * protate)) % vol->v_disks_count; 245 pleft = protate - (nstripe / ddisks) % protate; 246 if (qual >= 2) { /* PN/Left */ 247 pno = ddisks - pno; 248 if (pno < 0) 249 pno += vol->v_disks_count; 250 } 251 } 252 /* Data disk number. */ 253 no = nstripe % ddisks; 254 if (lvl == G_RAID_VOLUME_RL_RAID4) { 255 if (qual == 0) 256 no += pdisks; 257 } else if (qual & 1) { /* Continuation/Symmetric */ 258 no = (pno + pdisks + no) % vol->v_disks_count; 259 } else if (no >= pno) /* Restart/Asymmetric */ 260 no += pdisks; 261 else 262 no += imax(0, pno + pdisks - vol->v_disks_count); 263 /* Stripe start position in disk. */ 264 offset = (nstripe / ddisks) * strip_size; 265 /* Length of data to operate. */ 266 remain = bp->bio_length; 267 268 bioq_init(&queue); 269 do { 270 length = MIN(strip_size - start, remain); 271 cbp = g_clone_bio(bp); 272 if (cbp == NULL) 273 goto failure; 274 cbp->bio_offset = offset + start; 275 cbp->bio_data = addr; 276 cbp->bio_length = length; 277 cbp->bio_caller1 = &vol->v_subdisks[no]; 278 bioq_insert_tail(&queue, cbp); 279 no++; 280 if (lvl == G_RAID_VOLUME_RL_RAID4) { 281 no %= vol->v_disks_count; 282 if (no == pno) 283 no = (no + pdisks) % vol->v_disks_count; 284 } else if (qual & 1) { /* Continuation/Symmetric */ 285 no %= vol->v_disks_count; 286 if (no == pno) { 287 if ((--pleft) <= 0) { 288 pleft += protate; 289 if (qual < 2) /* P0/Right */ 290 pno++; 291 else /* PN/Left */ 292 pno += vol->v_disks_count - 1; 293 pno %= vol->v_disks_count; 294 } 295 no = (pno + pdisks) % vol->v_disks_count; 296 offset += strip_size; 297 } 298 } else { /* Restart/Asymmetric */ 299 if (no == pno) 300 no += pdisks; 301 if (no >= vol->v_disks_count) { 302 no -= vol->v_disks_count; 303 if ((--pleft) <= 0) { 304 pleft += protate; 305 if (qual < 2) /* P0/Right */ 306 pno++; 307 else /* PN/Left */ 308 pno += vol->v_disks_count - 1; 309 pno %= vol->v_disks_count; 310 } 311 if (no == pno) 312 no += pdisks; 313 else 314 no += imax(0, pno + pdisks - vol->v_disks_count); 315 offset += strip_size; 316 } 317 } 318 remain -= length; 319 addr += length; 320 start = 0; 321 } while (remain > 0); 322 for (cbp = bioq_first(&queue); cbp != NULL; 323 cbp = bioq_first(&queue)) { 324 bioq_remove(&queue, cbp); 325 sd = cbp->bio_caller1; 326 cbp->bio_caller1 = NULL; 327 g_raid_subdisk_iostart(sd, cbp); 328 } 329 return; 330 failure: 331 for (cbp = bioq_first(&queue); cbp != NULL; 332 cbp = bioq_first(&queue)) { 333 bioq_remove(&queue, cbp); 334 g_destroy_bio(cbp); 335 } 336 if (bp->bio_error == 0) 337 bp->bio_error = ENOMEM; 338 g_raid_iodone(bp, bp->bio_error); 339 } 340 341 static void 342 g_raid_tr_iostart_raid5(struct g_raid_tr_object *tr, struct bio *bp) 343 { 344 struct g_raid_volume *vol; 345 struct g_raid_tr_raid5_object *trs; 346 347 vol = tr->tro_volume; 348 trs = (struct g_raid_tr_raid5_object *)tr; 349 if (vol->v_state < G_RAID_VOLUME_S_SUBOPTIMAL) { 350 g_raid_iodone(bp, EIO); 351 return; 352 } 353 switch (bp->bio_cmd) { 354 case BIO_READ: 355 g_raid_tr_iostart_raid5_read(tr, bp); 356 break; 357 case BIO_WRITE: 358 case BIO_DELETE: 359 case BIO_FLUSH: 360 g_raid_iodone(bp, ENODEV); 361 break; 362 default: 363 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 364 bp->bio_cmd, vol->v_name)); 365 break; 366 } 367 } 368 369 static void 370 g_raid_tr_iodone_raid5(struct g_raid_tr_object *tr, 371 struct g_raid_subdisk *sd, struct bio *bp) 372 { 373 struct bio *pbp; 374 int error; 375 376 pbp = bp->bio_parent; 377 pbp->bio_inbed++; 378 error = bp->bio_error; 379 g_destroy_bio(bp); 380 if (pbp->bio_children == pbp->bio_inbed) { 381 pbp->bio_completed = pbp->bio_length; 382 g_raid_iodone(pbp, error); 383 } 384 } 385 386 static int 387 g_raid_tr_kerneldump_raid5(struct g_raid_tr_object *tr, 388 void *virtual, vm_offset_t physical, off_t offset, size_t length) 389 { 390 391 return (ENODEV); 392 } 393 394 static int 395 g_raid_tr_locked_raid5(struct g_raid_tr_object *tr, void *argp) 396 { 397 struct bio *bp; 398 struct g_raid_subdisk *sd; 399 400 bp = (struct bio *)argp; 401 sd = (struct g_raid_subdisk *)bp->bio_caller1; 402 g_raid_subdisk_iostart(sd, bp); 403 404 return (0); 405 } 406 407 static int 408 g_raid_tr_free_raid5(struct g_raid_tr_object *tr) 409 { 410 struct g_raid_tr_raid5_object *trs; 411 412 trs = (struct g_raid_tr_raid5_object *)tr; 413 414 if (trs->trso_buffer != NULL) { 415 free(trs->trso_buffer, M_TR_RAID5); 416 trs->trso_buffer = NULL; 417 } 418 return (0); 419 } 420 421 G_RAID_TR_DECLARE(raid5, "RAID5");
Cache object: dfbf3d8512b8f898b1ecf872d64ef43f
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