sys/geom/raid/tr_raid5.c

   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);