net/ceph/osdmap.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/slab.h>
   6 #include <asm/div64.h>
   7
   8 #include <linux/ceph/libceph.h>
   9 #include <linux/ceph/osdmap.h>
  10 #include <linux/ceph/decode.h>
  11 #include <linux/crush/hash.h>
  12 #include <linux/crush/mapper.h>
  13
  14 char *ceph_osdmap_state_str(char *str, int len, int state)
  15 {
  16         if (!len)
  17                 return str;
  18
  19         if ((state & CEPH_OSD_EXISTS) && (state & CEPH_OSD_UP))
  20                 snprintf(str, len, "exists, up");
  21         else if (state & CEPH_OSD_EXISTS)
  22                 snprintf(str, len, "exists");
  23         else if (state & CEPH_OSD_UP)
  24                 snprintf(str, len, "up");
  25         else
  26                 snprintf(str, len, "doesn't exist");
  27
  28         return str;
  29 }
  30
  31 /* maps */
  32
  33 static int calc_bits_of(unsigned int t)
  34 {
  35         int b = 0;
  36         while (t) {
  37                 t = t >> 1;
  38                 b++;
  39         }
  40         return b;
  41 }
  42
  43 /*
  44  * the foo_mask is the smallest value 2^n-1 that is >= foo.
  45  */
  46 static void calc_pg_masks(struct ceph_pg_pool_info *pi)
  47 {
  48         pi->pg_num_mask = (1 << calc_bits_of(pi->pg_num-1)) - 1;
  49         pi->pgp_num_mask = (1 << calc_bits_of(pi->pgp_num-1)) - 1;
  50 }
  51
  52 /*
  53  * decode crush map
  54  */
  55 static int crush_decode_uniform_bucket(void **p, void *end,
  56                                        struct crush_bucket_uniform *b)
  57 {
  58         dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
  59         ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
  60         b->item_weight = ceph_decode_32(p);
  61         return 0;
  62 bad:
  63         return -EINVAL;
  64 }
  65
  66 static int crush_decode_list_bucket(void **p, void *end,
  67                                     struct crush_bucket_list *b)
  68 {
  69         int j;
  70         dout("crush_decode_list_bucket %p to %p\n", *p, end);
  71         b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
  72         if (b->item_weights == NULL)
  73                 return -ENOMEM;
  74         b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
  75         if (b->sum_weights == NULL)
  76                 return -ENOMEM;
  77         ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
  78         for (j = 0; j < b->h.size; j++) {
  79                 b->item_weights[j] = ceph_decode_32(p);
  80                 b->sum_weights[j] = ceph_decode_32(p);
  81         }
  82         return 0;
  83 bad:
  84         return -EINVAL;
  85 }
  86
  87 static int crush_decode_tree_bucket(void **p, void *end,
  88                                     struct crush_bucket_tree *b)
  89 {
  90         int j;
  91         dout("crush_decode_tree_bucket %p to %p\n", *p, end);
  92         ceph_decode_32_safe(p, end, b->num_nodes, bad);
  93         b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
  94         if (b->node_weights == NULL)
  95                 return -ENOMEM;
  96         ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
  97         for (j = 0; j < b->num_nodes; j++)
  98                 b->node_weights[j] = ceph_decode_32(p);
  99         return 0;
 100 bad:
 101         return -EINVAL;
 102 }
 103
 104 static int crush_decode_straw_bucket(void **p, void *end,
 105                                      struct crush_bucket_straw *b)
 106 {
 107         int j;
 108         dout("crush_decode_straw_bucket %p to %p\n", *p, end);
 109         b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
 110         if (b->item_weights == NULL)
 111                 return -ENOMEM;
 112         b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
 113         if (b->straws == NULL)
 114                 return -ENOMEM;
 115         ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
 116         for (j = 0; j < b->h.size; j++) {
 117                 b->item_weights[j] = ceph_decode_32(p);
 118                 b->straws[j] = ceph_decode_32(p);
 119         }
 120         return 0;
 121 bad:
 122         return -EINVAL;
 123 }
 124
 125 static int skip_name_map(void **p, void *end)
 126 {
 127         int len;
 128         ceph_decode_32_safe(p, end, len ,bad);
 129         while (len--) {
 130                 int strlen;
 131                 *p += sizeof(u32);
 132                 ceph_decode_32_safe(p, end, strlen, bad);
 133                 *p += strlen;
 134 }
 135         return 0;
 136 bad:
 137         return -EINVAL;
 138 }
 139
 140 static struct crush_map *crush_decode(void *pbyval, void *end)
 141 {
 142         struct crush_map *c;
 143         int err = -EINVAL;
 144         int i, j;
 145         void **p = &pbyval;
 146         void *start = pbyval;
 147         u32 magic;
 148         u32 num_name_maps;
 149
 150         dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));
 151
 152         c = kzalloc(sizeof(*c), GFP_NOFS);
 153         if (c == NULL)
 154                 return ERR_PTR(-ENOMEM);
 155
 156         /* set tunables to default values */
 157         c->choose_local_tries = 2;
 158         c->choose_local_fallback_tries = 5;
 159         c->choose_total_tries = 19;
 160         c->chooseleaf_descend_once = 0;
 161
 162         ceph_decode_need(p, end, 4*sizeof(u32), bad);
 163         magic = ceph_decode_32(p);
 164         if (magic != CRUSH_MAGIC) {
 165                 pr_err("crush_decode magic %x != current %x\n",
 166                        (unsigned int)magic, (unsigned int)CRUSH_MAGIC);
 167                 goto bad;
 168         }
 169         c->max_buckets = ceph_decode_32(p);
 170         c->max_rules = ceph_decode_32(p);
 171         c->max_devices = ceph_decode_32(p);
 172
 173         c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
 174         if (c->buckets == NULL)
 175                 goto badmem;
 176         c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
 177         if (c->rules == NULL)
 178                 goto badmem;
 179
 180         /* buckets */
 181         for (i = 0; i < c->max_buckets; i++) {
 182                 int size = 0;
 183                 u32 alg;
 184                 struct crush_bucket *b;
 185
 186                 ceph_decode_32_safe(p, end, alg, bad);
 187                 if (alg == 0) {
 188                         c->buckets[i] = NULL;
 189                         continue;
 190                 }
 191                 dout("crush_decode bucket %d off %x %p to %p\n",
 192                      i, (int)(*p-start), *p, end);
 193
 194                 switch (alg) {
 195                 case CRUSH_BUCKET_UNIFORM:
 196                         size = sizeof(struct crush_bucket_uniform);
 197                         break;
 198                 case CRUSH_BUCKET_LIST:
 199                         size = sizeof(struct crush_bucket_list);
 200                         break;
 201                 case CRUSH_BUCKET_TREE:
 202                         size = sizeof(struct crush_bucket_tree);
 203                         break;
 204                 case CRUSH_BUCKET_STRAW:
 205                         size = sizeof(struct crush_bucket_straw);
 206                         break;
 207                 default:
 208                         err = -EINVAL;
 209                         goto bad;
 210                 }
 211                 BUG_ON(size == 0);
 212                 b = c->buckets[i] = kzalloc(size, GFP_NOFS);
 213                 if (b == NULL)
 214                         goto badmem;
 215
 216                 ceph_decode_need(p, end, 4*sizeof(u32), bad);
 217                 b->id = ceph_decode_32(p);
 218                 b->type = ceph_decode_16(p);
 219                 b->alg = ceph_decode_8(p);
 220                 b->hash = ceph_decode_8(p);
 221                 b->weight = ceph_decode_32(p);
 222                 b->size = ceph_decode_32(p);
 223
 224                 dout("crush_decode bucket size %d off %x %p to %p\n",
 225                      b->size, (int)(*p-start), *p, end);
 226
 227                 b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
 228                 if (b->items == NULL)
 229                         goto badmem;
 230                 b->perm = kcalloc(b->size, sizeof(u32), GFP_NOFS);
 231                 if (b->perm == NULL)
 232                         goto badmem;
 233                 b->perm_n = 0;
 234
 235                 ceph_decode_need(p, end, b->size*sizeof(u32), bad);
 236                 for (j = 0; j < b->size; j++)
 237                         b->items[j] = ceph_decode_32(p);
 238
 239                 switch (b->alg) {
 240                 case CRUSH_BUCKET_UNIFORM:
 241                         err = crush_decode_uniform_bucket(p, end,
 242                                   (struct crush_bucket_uniform *)b);
 243                         if (err < 0)
 244                                 goto bad;
 245                         break;
 246                 case CRUSH_BUCKET_LIST:
 247                         err = crush_decode_list_bucket(p, end,
 248                                (struct crush_bucket_list *)b);
 249                         if (err < 0)
 250                                 goto bad;
 251                         break;
 252                 case CRUSH_BUCKET_TREE:
 253                         err = crush_decode_tree_bucket(p, end,
 254                                 (struct crush_bucket_tree *)b);
 255                         if (err < 0)
 256                                 goto bad;
 257                         break;
 258                 case CRUSH_BUCKET_STRAW:
 259                         err = crush_decode_straw_bucket(p, end,
 260                                 (struct crush_bucket_straw *)b);
 261                         if (err < 0)
 262                                 goto bad;
 263                         break;
 264                 }
 265         }
 266
 267         /* rules */
 268         dout("rule vec is %p\n", c->rules);
 269         for (i = 0; i < c->max_rules; i++) {
 270                 u32 yes;
 271                 struct crush_rule *r;
 272
 273                 ceph_decode_32_safe(p, end, yes, bad);
 274                 if (!yes) {
 275                         dout("crush_decode NO rule %d off %x %p to %p\n",
 276                              i, (int)(*p-start), *p, end);
 277                         c->rules[i] = NULL;
 278                         continue;
 279                 }
 280
 281                 dout("crush_decode rule %d off %x %p to %p\n",
 282                      i, (int)(*p-start), *p, end);
 283
 284                 /* len */
 285                 ceph_decode_32_safe(p, end, yes, bad);
 286 #if BITS_PER_LONG == 32
 287                 err = -EINVAL;
 288                 if (yes > (ULONG_MAX - sizeof(*r))
 289                           / sizeof(struct crush_rule_step))
 290                         goto bad;
 291 #endif
 292                 r = c->rules[i] = kmalloc(sizeof(*r) +
 293                                           yes*sizeof(struct crush_rule_step),
 294                                           GFP_NOFS);
 295                 if (r == NULL)
 296                         goto badmem;
 297                 dout(" rule %d is at %p\n", i, r);
 298                 r->len = yes;
 299                 ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
 300                 ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
 301                 for (j = 0; j < r->len; j++) {
 302                         r->steps[j].op = ceph_decode_32(p);
 303                         r->steps[j].arg1 = ceph_decode_32(p);
 304                         r->steps[j].arg2 = ceph_decode_32(p);
 305                 }
 306         }
 307
 308         /* ignore trailing name maps. */
 309         for (num_name_maps = 0; num_name_maps < 3; num_name_maps++) {
 310                 err = skip_name_map(p, end);
 311                 if (err < 0)
 312                         goto done;
 313         }
 314
 315         /* tunables */
 316         ceph_decode_need(p, end, 3*sizeof(u32), done);
 317         c->choose_local_tries = ceph_decode_32(p);
 318         c->choose_local_fallback_tries =  ceph_decode_32(p);
 319         c->choose_total_tries = ceph_decode_32(p);
 320         dout("crush decode tunable choose_local_tries = %d",
 321              c->choose_local_tries);
 322         dout("crush decode tunable choose_local_fallback_tries = %d",
 323              c->choose_local_fallback_tries);
 324         dout("crush decode tunable choose_total_tries = %d",
 325              c->choose_total_tries);
 326
 327         ceph_decode_need(p, end, sizeof(u32), done);
 328         c->chooseleaf_descend_once = ceph_decode_32(p);
 329         dout("crush decode tunable chooseleaf_descend_once = %d",
 330              c->chooseleaf_descend_once);
 331
 332 done:
 333         dout("crush_decode success\n");
 334         return c;
 335
 336 badmem:
 337         err = -ENOMEM;
 338 bad:
 339         dout("crush_decode fail %d\n", err);
 340         crush_destroy(c);
 341         return ERR_PTR(err);
 342 }
 343
 344 /*
 345  * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
 346  * to a set of osds)
 347  */
 348 static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
 349 {
 350         if (l.pool < r.pool)
 351                 return -1;
 352         if (l.pool > r.pool)
 353                 return 1;
 354         if (l.seed < r.seed)
 355                 return -1;
 356         if (l.seed > r.seed)
 357                 return 1;
 358         return 0;
 359 }
 360
 361 static int __insert_pg_mapping(struct ceph_pg_mapping *new,
 362                                struct rb_root *root)
 363 {
 364         struct rb_node **p = &root->rb_node;
 365         struct rb_node *parent = NULL;
 366         struct ceph_pg_mapping *pg = NULL;
 367         int c;
 368
 369         dout("__insert_pg_mapping %llx %p\n", *(u64 *)&new->pgid, new);
 370         while (*p) {
 371                 parent = *p;
 372                 pg = rb_entry(parent, struct ceph_pg_mapping, node);
 373                 c = pgid_cmp(new->pgid, pg->pgid);
 374                 if (c < 0)
 375                         p = &(*p)->rb_left;
 376                 else if (c > 0)
 377                         p = &(*p)->rb_right;
 378                 else
 379                         return -EEXIST;
 380         }
 381
 382         rb_link_node(&new->node, parent, p);
 383         rb_insert_color(&new->node, root);
 384         return 0;
 385 }
 386
 387 static struct ceph_pg_mapping *__lookup_pg_mapping(struct rb_root *root,
 388                                                    struct ceph_pg pgid)
 389 {
 390         struct rb_node *n = root->rb_node;
 391         struct ceph_pg_mapping *pg;
 392         int c;
 393
 394         while (n) {
 395                 pg = rb_entry(n, struct ceph_pg_mapping, node);
 396                 c = pgid_cmp(pgid, pg->pgid);
 397                 if (c < 0) {
 398                         n = n->rb_left;
 399                 } else if (c > 0) {
 400                         n = n->rb_right;
 401                 } else {
 402                         dout("__lookup_pg_mapping %lld.%x got %p\n",
 403                              pgid.pool, pgid.seed, pg);
 404                         return pg;
 405                 }
 406         }
 407         return NULL;
 408 }
 409
 410 static int __remove_pg_mapping(struct rb_root *root, struct ceph_pg pgid)
 411 {
 412         struct ceph_pg_mapping *pg = __lookup_pg_mapping(root, pgid);
 413
 414         if (pg) {
 415                 dout("__remove_pg_mapping %lld.%x %p\n", pgid.pool, pgid.seed,
 416                      pg);
 417                 rb_erase(&pg->node, root);
 418                 kfree(pg);
 419                 return 0;
 420         }
 421         dout("__remove_pg_mapping %lld.%x dne\n", pgid.pool, pgid.seed);
 422         return -ENOENT;
 423 }
 424
 425 /*
 426  * rbtree of pg pool info
 427  */
 428 static int __insert_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *new)
 429 {
 430         struct rb_node **p = &root->rb_node;
 431         struct rb_node *parent = NULL;
 432         struct ceph_pg_pool_info *pi = NULL;
 433
 434         while (*p) {
 435                 parent = *p;
 436                 pi = rb_entry(parent, struct ceph_pg_pool_info, node);
 437                 if (new->id < pi->id)
 438                         p = &(*p)->rb_left;
 439                 else if (new->id > pi->id)
 440                         p = &(*p)->rb_right;
 441                 else
 442                         return -EEXIST;
 443         }
 444
 445         rb_link_node(&new->node, parent, p);
 446         rb_insert_color(&new->node, root);
 447         return 0;
 448 }
 449
 450 static struct ceph_pg_pool_info *__lookup_pg_pool(struct rb_root *root, u64 id)
 451 {
 452         struct ceph_pg_pool_info *pi;
 453         struct rb_node *n = root->rb_node;
 454
 455         while (n) {
 456                 pi = rb_entry(n, struct ceph_pg_pool_info, node);
 457                 if (id < pi->id)
 458                         n = n->rb_left;
 459                 else if (id > pi->id)
 460                         n = n->rb_right;
 461                 else
 462                         return pi;
 463         }
 464         return NULL;
 465 }
 466
 467 const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id)
 468 {
 469         struct ceph_pg_pool_info *pi;
 470
 471         if (id == CEPH_NOPOOL)
 472                 return NULL;
 473
 474         if (WARN_ON_ONCE(id > (u64) INT_MAX))
 475                 return NULL;
 476
 477         pi = __lookup_pg_pool(&map->pg_pools, (int) id);
 478
 479         return pi ? pi->name : NULL;
 480 }
 481 EXPORT_SYMBOL(ceph_pg_pool_name_by_id);
 482
 483 int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name)
 484 {
 485         struct rb_node *rbp;
 486
 487         for (rbp = rb_first(&map->pg_pools); rbp; rbp = rb_next(rbp)) {
 488                 struct ceph_pg_pool_info *pi =
 489                         rb_entry(rbp, struct ceph_pg_pool_info, node);
 490                 if (pi->name && strcmp(pi->name, name) == 0)
 491                         return pi->id;
 492         }
 493         return -ENOENT;
 494 }
 495 EXPORT_SYMBOL(ceph_pg_poolid_by_name);
 496
 497 static void __remove_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *pi)
 498 {
 499         rb_erase(&pi->node, root);
 500         kfree(pi->name);
 501         kfree(pi);
 502 }
 503
 504 static int __decode_pool(void **p, void *end, struct ceph_pg_pool_info *pi)
 505 {
 506         u8 ev, cv;
 507         unsigned len, num;
 508         void *pool_end;
 509
 510         ceph_decode_need(p, end, 2 + 4, bad);
 511         ev = ceph_decode_8(p);  /* encoding version */
 512         cv = ceph_decode_8(p); /* compat version */
 513         if (ev < 5) {
 514                 pr_warning("got v %d < 5 cv %d of ceph_pg_pool\n", ev, cv);
 515                 return -EINVAL;
 516         }
 517         if (cv > 7) {
 518                 pr_warning("got v %d cv %d > 7 of ceph_pg_pool\n", ev, cv);
 519                 return -EINVAL;
 520         }
 521         len = ceph_decode_32(p);
 522         ceph_decode_need(p, end, len, bad);
 523         pool_end = *p + len;
 524
 525         pi->type = ceph_decode_8(p);
 526         pi->size = ceph_decode_8(p);
 527         pi->crush_ruleset = ceph_decode_8(p);
 528         pi->object_hash = ceph_decode_8(p);
 529
 530         pi->pg_num = ceph_decode_32(p);
 531         pi->pgp_num = ceph_decode_32(p);
 532
 533         *p += 4 + 4;  /* skip lpg* */
 534         *p += 4;      /* skip last_change */
 535         *p += 8 + 4;  /* skip snap_seq, snap_epoch */
 536
 537         /* skip snaps */
 538         num = ceph_decode_32(p);
 539         while (num--) {
 540                 *p += 8;  /* snapid key */
 541                 *p += 1 + 1; /* versions */
 542                 len = ceph_decode_32(p);
 543                 *p += len;
 544         }
 545
 546         /* skip removed snaps */
 547         num = ceph_decode_32(p);
 548         *p += num * (8 + 8);
 549
 550         *p += 8;  /* skip auid */
 551         pi->flags = ceph_decode_64(p);
 552
 553         /* ignore the rest */
 554
 555         *p = pool_end;
 556         calc_pg_masks(pi);
 557         return 0;
 558
 559 bad:
 560         return -EINVAL;
 561 }
 562
 563 static int __decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
 564 {
 565         struct ceph_pg_pool_info *pi;
 566         u32 num, len;
 567         u64 pool;
 568
 569         ceph_decode_32_safe(p, end, num, bad);
 570         dout(" %d pool names\n", num);
 571         while (num--) {
 572                 ceph_decode_64_safe(p, end, pool, bad);
 573                 ceph_decode_32_safe(p, end, len, bad);
 574                 dout("  pool %llu len %d\n", pool, len);
 575                 ceph_decode_need(p, end, len, bad);
 576                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 577                 if (pi) {
 578                         char *name = kstrndup(*p, len, GFP_NOFS);
 579
 580                         if (!name)
 581                                 return -ENOMEM;
 582                         kfree(pi->name);
 583                         pi->name = name;
 584                         dout("  name is %s\n", pi->name);
 585                 }
 586                 *p += len;
 587         }
 588         return 0;
 589
 590 bad:
 591         return -EINVAL;
 592 }
 593
 594 /*
 595  * osd map
 596  */
 597 void ceph_osdmap_destroy(struct ceph_osdmap *map)
 598 {
 599         dout("osdmap_destroy %p\n", map);
 600         if (map->crush)
 601                 crush_destroy(map->crush);
 602         while (!RB_EMPTY_ROOT(&map->pg_temp)) {
 603                 struct ceph_pg_mapping *pg =
 604                         rb_entry(rb_first(&map->pg_temp),
 605                                  struct ceph_pg_mapping, node);
 606                 rb_erase(&pg->node, &map->pg_temp);
 607                 kfree(pg);
 608         }
 609         while (!RB_EMPTY_ROOT(&map->pg_pools)) {
 610                 struct ceph_pg_pool_info *pi =
 611                         rb_entry(rb_first(&map->pg_pools),
 612                                  struct ceph_pg_pool_info, node);
 613                 __remove_pg_pool(&map->pg_pools, pi);
 614         }
 615         kfree(map->osd_state);
 616         kfree(map->osd_weight);
 617         kfree(map->osd_addr);
 618         kfree(map);
 619 }
 620
 621 /*
 622  * adjust max osd value.  reallocate arrays.
 623  */
 624 static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 625 {
 626         u8 *state;
 627         struct ceph_entity_addr *addr;
 628         u32 *weight;
 629
 630         state = kcalloc(max, sizeof(*state), GFP_NOFS);
 631         addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
 632         weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
 633         if (state == NULL || addr == NULL || weight == NULL) {
 634                 kfree(state);
 635                 kfree(addr);
 636                 kfree(weight);
 637                 return -ENOMEM;
 638         }
 639
 640         /* copy old? */
 641         if (map->osd_state) {
 642                 memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
 643                 memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
 644                 memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
 645                 kfree(map->osd_state);
 646                 kfree(map->osd_addr);
 647                 kfree(map->osd_weight);
 648         }
 649
 650         map->osd_state = state;
 651         map->osd_weight = weight;
 652         map->osd_addr = addr;
 653         map->max_osd = max;
 654         return 0;
 655 }
 656
 657 /*
 658  * decode a full map.
 659  */
 660 struct ceph_osdmap *osdmap_decode(void **p, void *end)
 661 {
 662         struct ceph_osdmap *map;
 663         u16 version;
 664         u32 len, max, i;
 665         int err = -EINVAL;
 666         void *start = *p;
 667         struct ceph_pg_pool_info *pi;
 668
 669         dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
 670
 671         map = kzalloc(sizeof(*map), GFP_NOFS);
 672         if (map == NULL)
 673                 return ERR_PTR(-ENOMEM);
 674         map->pg_temp = RB_ROOT;
 675
 676         ceph_decode_16_safe(p, end, version, bad);
 677         if (version > 6) {
 678                 pr_warning("got unknown v %d > 6 of osdmap\n", version);
 679                 goto bad;
 680         }
 681         if (version < 6) {
 682                 pr_warning("got old v %d < 6 of osdmap\n", version);
 683                 goto bad;
 684         }
 685
 686         ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
 687         ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
 688         map->epoch = ceph_decode_32(p);
 689         ceph_decode_copy(p, &map->created, sizeof(map->created));
 690         ceph_decode_copy(p, &map->modified, sizeof(map->modified));
 691
 692         ceph_decode_32_safe(p, end, max, bad);
 693         while (max--) {
 694                 ceph_decode_need(p, end, 8 + 2, bad);
 695                 err = -ENOMEM;
 696                 pi = kzalloc(sizeof(*pi), GFP_NOFS);
 697                 if (!pi)
 698                         goto bad;
 699                 pi->id = ceph_decode_64(p);
 700                 err = __decode_pool(p, end, pi);
 701                 if (err < 0) {
 702                         kfree(pi);
 703                         goto bad;
 704                 }
 705                 __insert_pg_pool(&map->pg_pools, pi);
 706         }
 707
 708         err = __decode_pool_names(p, end, map);
 709         if (err < 0) {
 710                 dout("fail to decode pool names");
 711                 goto bad;
 712         }
 713
 714         ceph_decode_32_safe(p, end, map->pool_max, bad);
 715
 716         ceph_decode_32_safe(p, end, map->flags, bad);
 717
 718         max = ceph_decode_32(p);
 719
 720         /* (re)alloc osd arrays */
 721         err = osdmap_set_max_osd(map, max);
 722         if (err < 0)
 723                 goto bad;
 724         dout("osdmap_decode max_osd = %d\n", map->max_osd);
 725
 726         /* osds */
 727         err = -EINVAL;
 728         ceph_decode_need(p, end, 3*sizeof(u32) +
 729                          map->max_osd*(1 + sizeof(*map->osd_weight) +
 730                                        sizeof(*map->osd_addr)), bad);
 731         *p += 4; /* skip length field (should match max) */
 732         ceph_decode_copy(p, map->osd_state, map->max_osd);
 733
 734         *p += 4; /* skip length field (should match max) */
 735         for (i = 0; i < map->max_osd; i++)
 736                 map->osd_weight[i] = ceph_decode_32(p);
 737
 738         *p += 4; /* skip length field (should match max) */
 739         ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
 740         for (i = 0; i < map->max_osd; i++)
 741                 ceph_decode_addr(&map->osd_addr[i]);
 742
 743         /* pg_temp */
 744         ceph_decode_32_safe(p, end, len, bad);
 745         for (i = 0; i < len; i++) {
 746                 int n, j;
 747                 struct ceph_pg pgid;
 748                 struct ceph_pg_v1 pgid_v1;
 749                 struct ceph_pg_mapping *pg;
 750
 751                 ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
 752                 ceph_decode_copy(p, &pgid_v1, sizeof(pgid_v1));
 753                 pgid.pool = le32_to_cpu(pgid_v1.pool);
 754                 pgid.seed = le16_to_cpu(pgid_v1.ps);
 755                 n = ceph_decode_32(p);
 756                 err = -EINVAL;
 757                 if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
 758                         goto bad;
 759                 ceph_decode_need(p, end, n * sizeof(u32), bad);
 760                 err = -ENOMEM;
 761                 pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
 762                 if (!pg)
 763                         goto bad;
 764                 pg->pgid = pgid;
 765                 pg->len = n;
 766                 for (j = 0; j < n; j++)
 767                         pg->osds[j] = ceph_decode_32(p);
 768
 769                 err = __insert_pg_mapping(pg, &map->pg_temp);
 770                 if (err)
 771                         goto bad;
 772                 dout(" added pg_temp %lld.%x len %d\n", pgid.pool, pgid.seed,
 773                      len);
 774         }
 775
 776         /* crush */
 777         ceph_decode_32_safe(p, end, len, bad);
 778         dout("osdmap_decode crush len %d from off 0x%x\n", len,
 779              (int)(*p - start));
 780         ceph_decode_need(p, end, len, bad);
 781         map->crush = crush_decode(*p, end);
 782         *p += len;
 783         if (IS_ERR(map->crush)) {
 784                 err = PTR_ERR(map->crush);
 785                 map->crush = NULL;
 786                 goto bad;
 787         }
 788
 789         /* ignore the rest of the map */
 790         *p = end;
 791
 792         dout("osdmap_decode done %p %p\n", *p, end);
 793         return map;
 794
 795 bad:
 796         dout("osdmap_decode fail err %d\n", err);
 797         ceph_osdmap_destroy(map);
 798         return ERR_PTR(err);
 799 }
 800
 801 /*
 802  * decode and apply an incremental map update.
 803  */
 804 struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 805                                              struct ceph_osdmap *map,
 806                                              struct ceph_messenger *msgr)
 807 {
 808         struct crush_map *newcrush = NULL;
 809         struct ceph_fsid fsid;
 810         u32 epoch = 0;
 811         struct ceph_timespec modified;
 812         s32 len;
 813         u64 pool;
 814         __s64 new_pool_max;
 815         __s32 new_flags, max;
 816         void *start = *p;
 817         int err = -EINVAL;
 818         u16 version;
 819
 820         ceph_decode_16_safe(p, end, version, bad);
 821         if (version > 6) {
 822                 pr_warning("got unknown v %d > %d of inc osdmap\n", version, 6);
 823                 goto bad;
 824         }
 825
 826         ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
 827                          bad);
 828         ceph_decode_copy(p, &fsid, sizeof(fsid));
 829         epoch = ceph_decode_32(p);
 830         BUG_ON(epoch != map->epoch+1);
 831         ceph_decode_copy(p, &modified, sizeof(modified));
 832         new_pool_max = ceph_decode_64(p);
 833         new_flags = ceph_decode_32(p);
 834
 835         /* full map? */
 836         ceph_decode_32_safe(p, end, len, bad);
 837         if (len > 0) {
 838                 dout("apply_incremental full map len %d, %p to %p\n",
 839                      len, *p, end);
 840                 return osdmap_decode(p, min(*p+len, end));
 841         }
 842
 843         /* new crush? */
 844         ceph_decode_32_safe(p, end, len, bad);
 845         if (len > 0) {
 846                 dout("apply_incremental new crush map len %d, %p to %p\n",
 847                      len, *p, end);
 848                 newcrush = crush_decode(*p, min(*p+len, end));
 849                 if (IS_ERR(newcrush))
 850                         return ERR_CAST(newcrush);
 851                 *p += len;
 852         }
 853
 854         /* new flags? */
 855         if (new_flags >= 0)
 856                 map->flags = new_flags;
 857         if (new_pool_max >= 0)
 858                 map->pool_max = new_pool_max;
 859
 860         ceph_decode_need(p, end, 5*sizeof(u32), bad);
 861
 862         /* new max? */
 863         max = ceph_decode_32(p);
 864         if (max >= 0) {
 865                 err = osdmap_set_max_osd(map, max);
 866                 if (err < 0)
 867                         goto bad;
 868         }
 869
 870         map->epoch++;
 871         map->modified = modified;
 872         if (newcrush) {
 873                 if (map->crush)
 874                         crush_destroy(map->crush);
 875                 map->crush = newcrush;
 876                 newcrush = NULL;
 877         }
 878
 879         /* new_pool */
 880         ceph_decode_32_safe(p, end, len, bad);
 881         while (len--) {
 882                 struct ceph_pg_pool_info *pi;
 883
 884                 ceph_decode_64_safe(p, end, pool, bad);
 885                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 886                 if (!pi) {
 887                         pi = kzalloc(sizeof(*pi), GFP_NOFS);
 888                         if (!pi) {
 889                                 err = -ENOMEM;
 890                                 goto bad;
 891                         }
 892                         pi->id = pool;
 893                         __insert_pg_pool(&map->pg_pools, pi);
 894                 }
 895                 err = __decode_pool(p, end, pi);
 896                 if (err < 0)
 897                         goto bad;
 898         }
 899         if (version >= 5) {
 900                 err = __decode_pool_names(p, end, map);
 901                 if (err < 0)
 902                         goto bad;
 903         }
 904
 905         /* old_pool */
 906         ceph_decode_32_safe(p, end, len, bad);
 907         while (len--) {
 908                 struct ceph_pg_pool_info *pi;
 909
 910                 ceph_decode_64_safe(p, end, pool, bad);
 911                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 912                 if (pi)
 913                         __remove_pg_pool(&map->pg_pools, pi);
 914         }
 915
 916         /* new_up */
 917         err = -EINVAL;
 918         ceph_decode_32_safe(p, end, len, bad);
 919         while (len--) {
 920                 u32 osd;
 921                 struct ceph_entity_addr addr;
 922                 ceph_decode_32_safe(p, end, osd, bad);
 923                 ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
 924                 ceph_decode_addr(&addr);
 925                 pr_info("osd%d up\n", osd);
 926                 BUG_ON(osd >= map->max_osd);
 927                 map->osd_state[osd] |= CEPH_OSD_UP;
 928                 map->osd_addr[osd] = addr;
 929         }
 930
 931         /* new_state */
 932         ceph_decode_32_safe(p, end, len, bad);
 933         while (len--) {
 934                 u32 osd;
 935                 u8 xorstate;
 936                 ceph_decode_32_safe(p, end, osd, bad);
 937                 xorstate = **(u8 **)p;
 938                 (*p)++;  /* clean flag */
 939                 if (xorstate == 0)
 940                         xorstate = CEPH_OSD_UP;
 941                 if (xorstate & CEPH_OSD_UP)
 942                         pr_info("osd%d down\n", osd);
 943                 if (osd < map->max_osd)
 944                         map->osd_state[osd] ^= xorstate;
 945         }
 946
 947         /* new_weight */
 948         ceph_decode_32_safe(p, end, len, bad);
 949         while (len--) {
 950                 u32 osd, off;
 951                 ceph_decode_need(p, end, sizeof(u32)*2, bad);
 952                 osd = ceph_decode_32(p);
 953                 off = ceph_decode_32(p);
 954                 pr_info("osd%d weight 0x%x %s\n", osd, off,
 955                      off == CEPH_OSD_IN ? "(in)" :
 956                      (off == CEPH_OSD_OUT ? "(out)" : ""));
 957                 if (osd < map->max_osd)
 958                         map->osd_weight[osd] = off;
 959         }
 960
 961         /* new_pg_temp */
 962         ceph_decode_32_safe(p, end, len, bad);
 963         while (len--) {
 964                 struct ceph_pg_mapping *pg;
 965                 int j;
 966                 struct ceph_pg_v1 pgid_v1;
 967                 struct ceph_pg pgid;
 968                 u32 pglen;
 969                 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
 970                 ceph_decode_copy(p, &pgid_v1, sizeof(pgid_v1));
 971                 pgid.pool = le32_to_cpu(pgid_v1.pool);
 972                 pgid.seed = le16_to_cpu(pgid_v1.ps);
 973                 pglen = ceph_decode_32(p);
 974
 975                 if (pglen) {
 976                         ceph_decode_need(p, end, pglen*sizeof(u32), bad);
 977
 978                         /* removing existing (if any) */
 979                         (void) __remove_pg_mapping(&map->pg_temp, pgid);
 980
 981                         /* insert */
 982                         err = -EINVAL;
 983                         if (pglen > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
 984                                 goto bad;
 985                         err = -ENOMEM;
 986                         pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
 987                         if (!pg)
 988                                 goto bad;
 989                         pg->pgid = pgid;
 990                         pg->len = pglen;
 991                         for (j = 0; j < pglen; j++)
 992                                 pg->osds[j] = ceph_decode_32(p);
 993                         err = __insert_pg_mapping(pg, &map->pg_temp);
 994                         if (err) {
 995                                 kfree(pg);
 996                                 goto bad;
 997                         }
 998                         dout(" added pg_temp %lld.%x len %d\n", pgid.pool,
 999                              pgid.seed, pglen);
1000                 } else {
1001                         /* remove */
1002                         __remove_pg_mapping(&map->pg_temp, pgid);
1003                 }
1004         }
1005
1006         /* ignore the rest */
1007         *p = end;
1008         return map;
1009
1010 bad:
1011         pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
1012                epoch, (int)(*p - start), *p, start, end);
1013         print_hex_dump(KERN_DEBUG, "osdmap: ",
1014                        DUMP_PREFIX_OFFSET, 16, 1,
1015                        start, end - start, true);
1016         if (newcrush)
1017                 crush_destroy(newcrush);
1018         return ERR_PTR(err);
1019 }
1020
1021
1022
1023
1024 /*
1025  * calculate file layout from given offset, length.
1026  * fill in correct oid, logical length, and object extent
1027  * offset, length.
1028  *
1029  * for now, we write only a single su, until we can
1030  * pass a stride back to the caller.
1031  */
1032 int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
1033                                    u64 off, u64 len,
1034                                    u64 *ono,
1035                                    u64 *oxoff, u64 *oxlen)
1036 {
1037         u32 osize = le32_to_cpu(layout->fl_object_size);
1038         u32 su = le32_to_cpu(layout->fl_stripe_unit);
1039         u32 sc = le32_to_cpu(layout->fl_stripe_count);
1040         u32 bl, stripeno, stripepos, objsetno;
1041         u32 su_per_object;
1042         u64 t, su_offset;
1043
1044         dout("mapping %llu~%llu  osize %u fl_su %u\n", off, len,
1045              osize, su);
1046         if (su == 0 || sc == 0)
1047                 goto invalid;
1048         su_per_object = osize / su;
1049         if (su_per_object == 0)
1050                 goto invalid;
1051         dout("osize %u / su %u = su_per_object %u\n", osize, su,
1052              su_per_object);
1053
1054         if ((su & ~PAGE_MASK) != 0)
1055                 goto invalid;
1056
1057         /* bl = *off / su; */
1058         t = off;
1059         do_div(t, su);
1060         bl = t;
1061         dout("off %llu / su %u = bl %u\n", off, su, bl);
1062
1063         stripeno = bl / sc;
1064         stripepos = bl % sc;
1065         objsetno = stripeno / su_per_object;
1066
1067         *ono = objsetno * sc + stripepos;
1068         dout("objset %u * sc %u = ono %u\n", objsetno, sc, (unsigned int)*ono);
1069
1070         /* *oxoff = *off % layout->fl_stripe_unit;  # offset in su */
1071         t = off;
1072         su_offset = do_div(t, su);
1073         *oxoff = su_offset + (stripeno % su_per_object) * su;
1074
1075         /*
1076          * Calculate the length of the extent being written to the selected
1077          * object. This is the minimum of the full length requested (len) or
1078          * the remainder of the current stripe being written to.
1079          */
1080         *oxlen = min_t(u64, len, su - su_offset);
1081
1082         dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
1083         return 0;
1084
1085 invalid:
1086         dout(" invalid layout\n");
1087         *ono = 0;
1088         *oxoff = 0;
1089         *oxlen = 0;
1090         return -EINVAL;
1091 }
1092 EXPORT_SYMBOL(ceph_calc_file_object_mapping);
1093
1094 /*
1095  * calculate an object layout (i.e. pgid) from an oid,
1096  * file_layout, and osdmap
1097  */
1098 int ceph_calc_object_layout(struct ceph_pg *pg,
1099                             const char *oid,
1100                             struct ceph_file_layout *fl,
1101                             struct ceph_osdmap *osdmap)
1102 {
1103         unsigned int num, num_mask;
1104         struct ceph_pg_pool_info *pool;
1105
1106         BUG_ON(!osdmap);
1107         pg->pool = le32_to_cpu(fl->fl_pg_pool);
1108         pool = __lookup_pg_pool(&osdmap->pg_pools, pg->pool);
1109         if (!pool)
1110                 return -EIO;
1111         pg->seed = ceph_str_hash(pool->object_hash, oid, strlen(oid));
1112         num = pool->pg_num;
1113         num_mask = pool->pg_num_mask;
1114
1115         dout("calc_object_layout '%s' pgid %lld.%x\n", oid, pg->pool, pg->seed);
1116         return 0;
1117 }
1118 EXPORT_SYMBOL(ceph_calc_object_layout);
1119
1120 /*
1121  * Calculate raw osd vector for the given pgid.  Return pointer to osd
1122  * array, or NULL on failure.
1123  */
1124 static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
1125                         int *osds, int *num)
1126 {
1127         struct ceph_pg_mapping *pg;
1128         struct ceph_pg_pool_info *pool;
1129         int ruleno;
1130         int r;
1131         u32 pps;
1132
1133         pool = __lookup_pg_pool(&osdmap->pg_pools, pgid.pool);
1134         if (!pool)
1135                 return NULL;
1136
1137         /* pg_temp? */
1138         pgid.seed = ceph_stable_mod(pgid.seed, pool->pg_num,
1139                                     pool->pgp_num_mask);
1140         pg = __lookup_pg_mapping(&osdmap->pg_temp, pgid);
1141         if (pg) {
1142                 *num = pg->len;
1143                 return pg->osds;
1144         }
1145
1146         /* crush */
1147         ruleno = crush_find_rule(osdmap->crush, pool->crush_ruleset,
1148                                  pool->type, pool->size);
1149         if (ruleno < 0) {
1150                 pr_err("no crush rule pool %lld ruleset %d type %d size %d\n",
1151                        pgid.pool, pool->crush_ruleset, pool->type,
1152                        pool->size);
1153                 return NULL;
1154         }
1155
1156         if (pool->flags & CEPH_POOL_FLAG_HASHPSPOOL) {
1157                 /* hash pool id and seed sothat pool PGs do not overlap */
1158                 pps = crush_hash32_2(CRUSH_HASH_RJENKINS1,
1159                                      ceph_stable_mod(pgid.seed, pool->pgp_num,
1160                                                      pool->pgp_num_mask),
1161                                      pgid.pool);
1162         } else {
1163                 /*
1164                  * legacy ehavior: add ps and pool together.  this is
1165                  * not a great approach because the PGs from each pool
1166                  * will overlap on top of each other: 0.5 == 1.4 ==
1167                  * 2.3 == ...
1168                  */
1169                 pps = ceph_stable_mod(pgid.seed, pool->pgp_num,
1170                                       pool->pgp_num_mask) +
1171                         (unsigned)pgid.pool;
1172         }
1173         r = crush_do_rule(osdmap->crush, ruleno, pps, osds,
1174                           min_t(int, pool->size, *num),
1175                           osdmap->osd_weight);
1176         if (r < 0) {
1177                 pr_err("error %d from crush rule: pool %lld ruleset %d type %d"
1178                        " size %d\n", r, pgid.pool, pool->crush_ruleset,
1179                        pool->type, pool->size);
1180                 return NULL;
1181         }
1182         *num = r;
1183         return osds;
1184 }
1185
1186 /*
1187  * Return acting set for given pgid.
1188  */
1189 int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
1190                         int *acting)
1191 {
1192         int rawosds[CEPH_PG_MAX_SIZE], *osds;
1193         int i, o, num = CEPH_PG_MAX_SIZE;
1194
1195         osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
1196         if (!osds)
1197                 return -1;
1198
1199         /* primary is first up osd */
1200         o = 0;
1201         for (i = 0; i < num; i++)
1202                 if (ceph_osd_is_up(osdmap, osds[i]))
1203                         acting[o++] = osds[i];
1204         return o;
1205 }
1206
1207 /*
1208  * Return primary osd for given pgid, or -1 if none.
1209  */
1210 int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, struct ceph_pg pgid)
1211 {
1212         int rawosds[CEPH_PG_MAX_SIZE], *osds;
1213         int i, num = CEPH_PG_MAX_SIZE;
1214
1215         osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
1216         if (!osds)
1217                 return -1;
1218
1219         /* primary is first up osd */
1220         for (i = 0; i < num; i++)
1221                 if (ceph_osd_is_up(osdmap, osds[i]))
1222                         return osds[i];
1223         return -1;
1224 }
1225 EXPORT_SYMBOL(ceph_calc_pg_primary);