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         int flag = 0;
  17
  18         if (!len)
  19                 goto done;
  20
  21         *str = '\0';
  22         if (state) {
  23                 if (state & CEPH_OSD_EXISTS) {
  24                         snprintf(str, len, "exists");
  25                         flag = 1;
  26                 }
  27                 if (state & CEPH_OSD_UP) {
  28                         snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
  29                                  "up");
  30                         flag = 1;
  31                 }
  32         } else {
  33                 snprintf(str, len, "doesn't exist");
  34         }
  35 done:
  36         return str;
  37 }
  38
  39 /* maps */
  40
  41 static int calc_bits_of(unsigned int t)
  42 {
  43         int b = 0;
  44         while (t) {
  45                 t = t >> 1;
  46                 b++;
  47         }
  48         return b;
  49 }
  50
  51 /*
  52  * the foo_mask is the smallest value 2^n-1 that is >= foo.
  53  */
  54 static void calc_pg_masks(struct ceph_pg_pool_info *pi)
  55 {
  56         pi->pg_num_mask = (1 << calc_bits_of(le32_to_cpu(pi->v.pg_num)-1)) - 1;
  57         pi->pgp_num_mask =
  58                 (1 << calc_bits_of(le32_to_cpu(pi->v.pgp_num)-1)) - 1;
  59         pi->lpg_num_mask =
  60                 (1 << calc_bits_of(le32_to_cpu(pi->v.lpg_num)-1)) - 1;
  61         pi->lpgp_num_mask =
  62                 (1 << calc_bits_of(le32_to_cpu(pi->v.lpgp_num)-1)) - 1;
  63 }
  64
  65 /*
  66  * decode crush map
  67  */
  68 static int crush_decode_uniform_bucket(void **p, void *end,
  69                                        struct crush_bucket_uniform *b)
  70 {
  71         dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
  72         ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
  73         b->item_weight = ceph_decode_32(p);
  74         return 0;
  75 bad:
  76         return -EINVAL;
  77 }
  78
  79 static int crush_decode_list_bucket(void **p, void *end,
  80                                     struct crush_bucket_list *b)
  81 {
  82         int j;
  83         dout("crush_decode_list_bucket %p to %p\n", *p, end);
  84         b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
  85         if (b->item_weights == NULL)
  86                 return -ENOMEM;
  87         b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
  88         if (b->sum_weights == NULL)
  89                 return -ENOMEM;
  90         ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
  91         for (j = 0; j < b->h.size; j++) {
  92                 b->item_weights[j] = ceph_decode_32(p);
  93                 b->sum_weights[j] = ceph_decode_32(p);
  94         }
  95         return 0;
  96 bad:
  97         return -EINVAL;
  98 }
  99
 100 static int crush_decode_tree_bucket(void **p, void *end,
 101                                     struct crush_bucket_tree *b)
 102 {
 103         int j;
 104         dout("crush_decode_tree_bucket %p to %p\n", *p, end);
 105         ceph_decode_32_safe(p, end, b->num_nodes, bad);
 106         b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
 107         if (b->node_weights == NULL)
 108                 return -ENOMEM;
 109         ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
 110         for (j = 0; j < b->num_nodes; j++)
 111                 b->node_weights[j] = ceph_decode_32(p);
 112         return 0;
 113 bad:
 114         return -EINVAL;
 115 }
 116
 117 static int crush_decode_straw_bucket(void **p, void *end,
 118                                      struct crush_bucket_straw *b)
 119 {
 120         int j;
 121         dout("crush_decode_straw_bucket %p to %p\n", *p, end);
 122         b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
 123         if (b->item_weights == NULL)
 124                 return -ENOMEM;
 125         b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
 126         if (b->straws == NULL)
 127                 return -ENOMEM;
 128         ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
 129         for (j = 0; j < b->h.size; j++) {
 130                 b->item_weights[j] = ceph_decode_32(p);
 131                 b->straws[j] = ceph_decode_32(p);
 132         }
 133         return 0;
 134 bad:
 135         return -EINVAL;
 136 }
 137
 138 static int skip_name_map(void **p, void *end)
 139 {
 140         int len;
 141         ceph_decode_32_safe(p, end, len ,bad);
 142         while (len--) {
 143                 int strlen;
 144                 *p += sizeof(u32);
 145                 ceph_decode_32_safe(p, end, strlen, bad);
 146                 *p += strlen;
 147 }
 148         return 0;
 149 bad:
 150         return -EINVAL;
 151 }
 152
 153 static struct crush_map *crush_decode(void *pbyval, void *end)
 154 {
 155         struct crush_map *c;
 156         int err = -EINVAL;
 157         int i, j;
 158         void **p = &pbyval;
 159         void *start = pbyval;
 160         u32 magic;
 161         u32 num_name_maps;
 162
 163         dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));
 164
 165         c = kzalloc(sizeof(*c), GFP_NOFS);
 166         if (c == NULL)
 167                 return ERR_PTR(-ENOMEM);
 168
 169         /* set tunables to default values */
 170         c->choose_local_tries = 2;
 171         c->choose_local_fallback_tries = 5;
 172         c->choose_total_tries = 19;
 173
 174         ceph_decode_need(p, end, 4*sizeof(u32), bad);
 175         magic = ceph_decode_32(p);
 176         if (magic != CRUSH_MAGIC) {
 177                 pr_err("crush_decode magic %x != current %x\n",
 178                        (unsigned int)magic, (unsigned int)CRUSH_MAGIC);
 179                 goto bad;
 180         }
 181         c->max_buckets = ceph_decode_32(p);
 182         c->max_rules = ceph_decode_32(p);
 183         c->max_devices = ceph_decode_32(p);
 184
 185         c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
 186         if (c->buckets == NULL)
 187                 goto badmem;
 188         c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
 189         if (c->rules == NULL)
 190                 goto badmem;
 191
 192         /* buckets */
 193         for (i = 0; i < c->max_buckets; i++) {
 194                 int size = 0;
 195                 u32 alg;
 196                 struct crush_bucket *b;
 197
 198                 ceph_decode_32_safe(p, end, alg, bad);
 199                 if (alg == 0) {
 200                         c->buckets[i] = NULL;
 201                         continue;
 202                 }
 203                 dout("crush_decode bucket %d off %x %p to %p\n",
 204                      i, (int)(*p-start), *p, end);
 205
 206                 switch (alg) {
 207                 case CRUSH_BUCKET_UNIFORM:
 208                         size = sizeof(struct crush_bucket_uniform);
 209                         break;
 210                 case CRUSH_BUCKET_LIST:
 211                         size = sizeof(struct crush_bucket_list);
 212                         break;
 213                 case CRUSH_BUCKET_TREE:
 214                         size = sizeof(struct crush_bucket_tree);
 215                         break;
 216                 case CRUSH_BUCKET_STRAW:
 217                         size = sizeof(struct crush_bucket_straw);
 218                         break;
 219                 default:
 220                         err = -EINVAL;
 221                         goto bad;
 222                 }
 223                 BUG_ON(size == 0);
 224                 b = c->buckets[i] = kzalloc(size, GFP_NOFS);
 225                 if (b == NULL)
 226                         goto badmem;
 227
 228                 ceph_decode_need(p, end, 4*sizeof(u32), bad);
 229                 b->id = ceph_decode_32(p);
 230                 b->type = ceph_decode_16(p);
 231                 b->alg = ceph_decode_8(p);
 232                 b->hash = ceph_decode_8(p);
 233                 b->weight = ceph_decode_32(p);
 234                 b->size = ceph_decode_32(p);
 235
 236                 dout("crush_decode bucket size %d off %x %p to %p\n",
 237                      b->size, (int)(*p-start), *p, end);
 238
 239                 b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
 240                 if (b->items == NULL)
 241                         goto badmem;
 242                 b->perm = kcalloc(b->size, sizeof(u32), GFP_NOFS);
 243                 if (b->perm == NULL)
 244                         goto badmem;
 245                 b->perm_n = 0;
 246
 247                 ceph_decode_need(p, end, b->size*sizeof(u32), bad);
 248                 for (j = 0; j < b->size; j++)
 249                         b->items[j] = ceph_decode_32(p);
 250
 251                 switch (b->alg) {
 252                 case CRUSH_BUCKET_UNIFORM:
 253                         err = crush_decode_uniform_bucket(p, end,
 254                                   (struct crush_bucket_uniform *)b);
 255                         if (err < 0)
 256                                 goto bad;
 257                         break;
 258                 case CRUSH_BUCKET_LIST:
 259                         err = crush_decode_list_bucket(p, end,
 260                                (struct crush_bucket_list *)b);
 261                         if (err < 0)
 262                                 goto bad;
 263                         break;
 264                 case CRUSH_BUCKET_TREE:
 265                         err = crush_decode_tree_bucket(p, end,
 266                                 (struct crush_bucket_tree *)b);
 267                         if (err < 0)
 268                                 goto bad;
 269                         break;
 270                 case CRUSH_BUCKET_STRAW:
 271                         err = crush_decode_straw_bucket(p, end,
 272                                 (struct crush_bucket_straw *)b);
 273                         if (err < 0)
 274                                 goto bad;
 275                         break;
 276                 }
 277         }
 278
 279         /* rules */
 280         dout("rule vec is %p\n", c->rules);
 281         for (i = 0; i < c->max_rules; i++) {
 282                 u32 yes;
 283                 struct crush_rule *r;
 284
 285                 ceph_decode_32_safe(p, end, yes, bad);
 286                 if (!yes) {
 287                         dout("crush_decode NO rule %d off %x %p to %p\n",
 288                              i, (int)(*p-start), *p, end);
 289                         c->rules[i] = NULL;
 290                         continue;
 291                 }
 292
 293                 dout("crush_decode rule %d off %x %p to %p\n",
 294                      i, (int)(*p-start), *p, end);
 295
 296                 /* len */
 297                 ceph_decode_32_safe(p, end, yes, bad);
 298 #if BITS_PER_LONG == 32
 299                 err = -EINVAL;
 300                 if (yes > (ULONG_MAX - sizeof(*r))
 301                           / sizeof(struct crush_rule_step))
 302                         goto bad;
 303 #endif
 304                 r = c->rules[i] = kmalloc(sizeof(*r) +
 305                                           yes*sizeof(struct crush_rule_step),
 306                                           GFP_NOFS);
 307                 if (r == NULL)
 308                         goto badmem;
 309                 dout(" rule %d is at %p\n", i, r);
 310                 r->len = yes;
 311                 ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
 312                 ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
 313                 for (j = 0; j < r->len; j++) {
 314                         r->steps[j].op = ceph_decode_32(p);
 315                         r->steps[j].arg1 = ceph_decode_32(p);
 316                         r->steps[j].arg2 = ceph_decode_32(p);
 317                 }
 318         }
 319
 320         /* ignore trailing name maps. */
 321         for (num_name_maps = 0; num_name_maps < 3; num_name_maps++) {
 322                 err = skip_name_map(p, end);
 323                 if (err < 0)
 324                         goto done;
 325         }
 326
 327         /* tunables */
 328         ceph_decode_need(p, end, 3*sizeof(u32), done);
 329         c->choose_local_tries = ceph_decode_32(p);
 330         c->choose_local_fallback_tries =  ceph_decode_32(p);
 331         c->choose_total_tries = ceph_decode_32(p);
 332         dout("crush decode tunable choose_local_tries = %d",
 333              c->choose_local_tries);
 334         dout("crush decode tunable choose_local_fallback_tries = %d",
 335              c->choose_local_fallback_tries);
 336         dout("crush decode tunable choose_total_tries = %d",
 337              c->choose_total_tries);
 338
 339 done:
 340         dout("crush_decode success\n");
 341         return c;
 342
 343 badmem:
 344         err = -ENOMEM;
 345 bad:
 346         dout("crush_decode fail %d\n", err);
 347         crush_destroy(c);
 348         return ERR_PTR(err);
 349 }
 350
 351 /*
 352  * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
 353  * to a set of osds)
 354  */
 355 static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
 356 {
 357         u64 a = *(u64 *)&l;
 358         u64 b = *(u64 *)&r;
 359
 360         if (a < b)
 361                 return -1;
 362         if (a > b)
 363                 return 1;
 364         return 0;
 365 }
 366
 367 static int __insert_pg_mapping(struct ceph_pg_mapping *new,
 368                                struct rb_root *root)
 369 {
 370         struct rb_node **p = &root->rb_node;
 371         struct rb_node *parent = NULL;
 372         struct ceph_pg_mapping *pg = NULL;
 373         int c;
 374
 375         dout("__insert_pg_mapping %llx %p\n", *(u64 *)&new->pgid, new);
 376         while (*p) {
 377                 parent = *p;
 378                 pg = rb_entry(parent, struct ceph_pg_mapping, node);
 379                 c = pgid_cmp(new->pgid, pg->pgid);
 380                 if (c < 0)
 381                         p = &(*p)->rb_left;
 382                 else if (c > 0)
 383                         p = &(*p)->rb_right;
 384                 else
 385                         return -EEXIST;
 386         }
 387
 388         rb_link_node(&new->node, parent, p);
 389         rb_insert_color(&new->node, root);
 390         return 0;
 391 }
 392
 393 static struct ceph_pg_mapping *__lookup_pg_mapping(struct rb_root *root,
 394                                                    struct ceph_pg pgid)
 395 {
 396         struct rb_node *n = root->rb_node;
 397         struct ceph_pg_mapping *pg;
 398         int c;
 399
 400         while (n) {
 401                 pg = rb_entry(n, struct ceph_pg_mapping, node);
 402                 c = pgid_cmp(pgid, pg->pgid);
 403                 if (c < 0) {
 404                         n = n->rb_left;
 405                 } else if (c > 0) {
 406                         n = n->rb_right;
 407                 } else {
 408                         dout("__lookup_pg_mapping %llx got %p\n",
 409                              *(u64 *)&pgid, pg);
 410                         return pg;
 411                 }
 412         }
 413         return NULL;
 414 }
 415
 416 static int __remove_pg_mapping(struct rb_root *root, struct ceph_pg pgid)
 417 {
 418         struct ceph_pg_mapping *pg = __lookup_pg_mapping(root, pgid);
 419
 420         if (pg) {
 421                 dout("__remove_pg_mapping %llx %p\n", *(u64 *)&pgid, pg);
 422                 rb_erase(&pg->node, root);
 423                 kfree(pg);
 424                 return 0;
 425         }
 426         dout("__remove_pg_mapping %llx dne\n", *(u64 *)&pgid);
 427         return -ENOENT;
 428 }
 429
 430 /*
 431  * rbtree of pg pool info
 432  */
 433 static int __insert_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *new)
 434 {
 435         struct rb_node **p = &root->rb_node;
 436         struct rb_node *parent = NULL;
 437         struct ceph_pg_pool_info *pi = NULL;
 438
 439         while (*p) {
 440                 parent = *p;
 441                 pi = rb_entry(parent, struct ceph_pg_pool_info, node);
 442                 if (new->id < pi->id)
 443                         p = &(*p)->rb_left;
 444                 else if (new->id > pi->id)
 445                         p = &(*p)->rb_right;
 446                 else
 447                         return -EEXIST;
 448         }
 449
 450         rb_link_node(&new->node, parent, p);
 451         rb_insert_color(&new->node, root);
 452         return 0;
 453 }
 454
 455 static struct ceph_pg_pool_info *__lookup_pg_pool(struct rb_root *root, int id)
 456 {
 457         struct ceph_pg_pool_info *pi;
 458         struct rb_node *n = root->rb_node;
 459
 460         while (n) {
 461                 pi = rb_entry(n, struct ceph_pg_pool_info, node);
 462                 if (id < pi->id)
 463                         n = n->rb_left;
 464                 else if (id > pi->id)
 465                         n = n->rb_right;
 466                 else
 467                         return pi;
 468         }
 469         return NULL;
 470 }
 471
 472 const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id)
 473 {
 474         struct ceph_pg_pool_info *pi;
 475
 476         if (id == CEPH_NOPOOL)
 477                 return NULL;
 478
 479         if (WARN_ON_ONCE(id > (u64) INT_MAX))
 480                 return NULL;
 481
 482         pi = __lookup_pg_pool(&map->pg_pools, (int) id);
 483
 484         return pi ? pi->name : NULL;
 485 }
 486 EXPORT_SYMBOL(ceph_pg_pool_name_by_id);
 487
 488 int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name)
 489 {
 490         struct rb_node *rbp;
 491
 492         for (rbp = rb_first(&map->pg_pools); rbp; rbp = rb_next(rbp)) {
 493                 struct ceph_pg_pool_info *pi =
 494                         rb_entry(rbp, struct ceph_pg_pool_info, node);
 495                 if (pi->name && strcmp(pi->name, name) == 0)
 496                         return pi->id;
 497         }
 498         return -ENOENT;
 499 }
 500 EXPORT_SYMBOL(ceph_pg_poolid_by_name);
 501
 502 static void __remove_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *pi)
 503 {
 504         rb_erase(&pi->node, root);
 505         kfree(pi->name);
 506         kfree(pi);
 507 }
 508
 509 static int __decode_pool(void **p, void *end, struct ceph_pg_pool_info *pi)
 510 {
 511         unsigned int n, m;
 512
 513         ceph_decode_copy(p, &pi->v, sizeof(pi->v));
 514         calc_pg_masks(pi);
 515
 516         /* num_snaps * snap_info_t */
 517         n = le32_to_cpu(pi->v.num_snaps);
 518         while (n--) {
 519                 ceph_decode_need(p, end, sizeof(u64) + 1 + sizeof(u64) +
 520                                  sizeof(struct ceph_timespec), bad);
 521                 *p += sizeof(u64) +       /* key */
 522                         1 + sizeof(u64) + /* u8, snapid */
 523                         sizeof(struct ceph_timespec);
 524                 m = ceph_decode_32(p);    /* snap name */
 525                 *p += m;
 526         }
 527
 528         *p += le32_to_cpu(pi->v.num_removed_snap_intervals) * sizeof(u64) * 2;
 529         return 0;
 530
 531 bad:
 532         return -EINVAL;
 533 }
 534
 535 static int __decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
 536 {
 537         struct ceph_pg_pool_info *pi;
 538         u32 num, len, pool;
 539
 540         ceph_decode_32_safe(p, end, num, bad);
 541         dout(" %d pool names\n", num);
 542         while (num--) {
 543                 ceph_decode_32_safe(p, end, pool, bad);
 544                 ceph_decode_32_safe(p, end, len, bad);
 545                 dout("  pool %d len %d\n", pool, len);
 546                 ceph_decode_need(p, end, len, bad);
 547                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 548                 if (pi) {
 549                         char *name = kstrndup(*p, len, GFP_NOFS);
 550
 551                         if (!name)
 552                                 return -ENOMEM;
 553                         kfree(pi->name);
 554                         pi->name = name;
 555                         dout("  name is %s\n", pi->name);
 556                 }
 557                 *p += len;
 558         }
 559         return 0;
 560
 561 bad:
 562         return -EINVAL;
 563 }
 564
 565 /*
 566  * osd map
 567  */
 568 void ceph_osdmap_destroy(struct ceph_osdmap *map)
 569 {
 570         dout("osdmap_destroy %p\n", map);
 571         if (map->crush)
 572                 crush_destroy(map->crush);
 573         while (!RB_EMPTY_ROOT(&map->pg_temp)) {
 574                 struct ceph_pg_mapping *pg =
 575                         rb_entry(rb_first(&map->pg_temp),
 576                                  struct ceph_pg_mapping, node);
 577                 rb_erase(&pg->node, &map->pg_temp);
 578                 kfree(pg);
 579         }
 580         while (!RB_EMPTY_ROOT(&map->pg_pools)) {
 581                 struct ceph_pg_pool_info *pi =
 582                         rb_entry(rb_first(&map->pg_pools),
 583                                  struct ceph_pg_pool_info, node);
 584                 __remove_pg_pool(&map->pg_pools, pi);
 585         }
 586         kfree(map->osd_state);
 587         kfree(map->osd_weight);
 588         kfree(map->osd_addr);
 589         kfree(map);
 590 }
 591
 592 /*
 593  * adjust max osd value.  reallocate arrays.
 594  */
 595 static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 596 {
 597         u8 *state;
 598         struct ceph_entity_addr *addr;
 599         u32 *weight;
 600
 601         state = kcalloc(max, sizeof(*state), GFP_NOFS);
 602         addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
 603         weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
 604         if (state == NULL || addr == NULL || weight == NULL) {
 605                 kfree(state);
 606                 kfree(addr);
 607                 kfree(weight);
 608                 return -ENOMEM;
 609         }
 610
 611         /* copy old? */
 612         if (map->osd_state) {
 613                 memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
 614                 memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
 615                 memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
 616                 kfree(map->osd_state);
 617                 kfree(map->osd_addr);
 618                 kfree(map->osd_weight);
 619         }
 620
 621         map->osd_state = state;
 622         map->osd_weight = weight;
 623         map->osd_addr = addr;
 624         map->max_osd = max;
 625         return 0;
 626 }
 627
 628 /*
 629  * decode a full map.
 630  */
 631 struct ceph_osdmap *osdmap_decode(void **p, void *end)
 632 {
 633         struct ceph_osdmap *map;
 634         u16 version;
 635         u32 len, max, i;
 636         u8 ev;
 637         int err = -EINVAL;
 638         void *start = *p;
 639         struct ceph_pg_pool_info *pi;
 640
 641         dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
 642
 643         map = kzalloc(sizeof(*map), GFP_NOFS);
 644         if (map == NULL)
 645                 return ERR_PTR(-ENOMEM);
 646         map->pg_temp = RB_ROOT;
 647
 648         ceph_decode_16_safe(p, end, version, bad);
 649         if (version > CEPH_OSDMAP_VERSION) {
 650                 pr_warning("got unknown v %d > %d of osdmap\n", version,
 651                            CEPH_OSDMAP_VERSION);
 652                 goto bad;
 653         }
 654
 655         ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
 656         ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
 657         map->epoch = ceph_decode_32(p);
 658         ceph_decode_copy(p, &map->created, sizeof(map->created));
 659         ceph_decode_copy(p, &map->modified, sizeof(map->modified));
 660
 661         ceph_decode_32_safe(p, end, max, bad);
 662         while (max--) {
 663                 ceph_decode_need(p, end, 4 + 1 + sizeof(pi->v), bad);
 664                 err = -ENOMEM;
 665                 pi = kzalloc(sizeof(*pi), GFP_NOFS);
 666                 if (!pi)
 667                         goto bad;
 668                 pi->id = ceph_decode_32(p);
 669                 err = -EINVAL;
 670                 ev = ceph_decode_8(p); /* encoding version */
 671                 if (ev > CEPH_PG_POOL_VERSION) {
 672                         pr_warning("got unknown v %d > %d of ceph_pg_pool\n",
 673                                    ev, CEPH_PG_POOL_VERSION);
 674                         kfree(pi);
 675                         goto bad;
 676                 }
 677                 err = __decode_pool(p, end, pi);
 678                 if (err < 0) {
 679                         kfree(pi);
 680                         goto bad;
 681                 }
 682                 __insert_pg_pool(&map->pg_pools, pi);
 683         }
 684
 685         if (version >= 5) {
 686                 err = __decode_pool_names(p, end, map);
 687                 if (err < 0) {
 688                         dout("fail to decode pool names");
 689                         goto bad;
 690                 }
 691         }
 692
 693         ceph_decode_32_safe(p, end, map->pool_max, bad);
 694
 695         ceph_decode_32_safe(p, end, map->flags, bad);
 696
 697         max = ceph_decode_32(p);
 698
 699         /* (re)alloc osd arrays */
 700         err = osdmap_set_max_osd(map, max);
 701         if (err < 0)
 702                 goto bad;
 703         dout("osdmap_decode max_osd = %d\n", map->max_osd);
 704
 705         /* osds */
 706         err = -EINVAL;
 707         ceph_decode_need(p, end, 3*sizeof(u32) +
 708                          map->max_osd*(1 + sizeof(*map->osd_weight) +
 709                                        sizeof(*map->osd_addr)), bad);
 710         *p += 4; /* skip length field (should match max) */
 711         ceph_decode_copy(p, map->osd_state, map->max_osd);
 712
 713         *p += 4; /* skip length field (should match max) */
 714         for (i = 0; i < map->max_osd; i++)
 715                 map->osd_weight[i] = ceph_decode_32(p);
 716
 717         *p += 4; /* skip length field (should match max) */
 718         ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
 719         for (i = 0; i < map->max_osd; i++)
 720                 ceph_decode_addr(&map->osd_addr[i]);
 721
 722         /* pg_temp */
 723         ceph_decode_32_safe(p, end, len, bad);
 724         for (i = 0; i < len; i++) {
 725                 int n, j;
 726                 struct ceph_pg pgid;
 727                 struct ceph_pg_mapping *pg;
 728
 729                 ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
 730                 ceph_decode_copy(p, &pgid, sizeof(pgid));
 731                 n = ceph_decode_32(p);
 732                 err = -EINVAL;
 733                 if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
 734                         goto bad;
 735                 ceph_decode_need(p, end, n * sizeof(u32), bad);
 736                 err = -ENOMEM;
 737                 pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
 738                 if (!pg)
 739                         goto bad;
 740                 pg->pgid = pgid;
 741                 pg->len = n;
 742                 for (j = 0; j < n; j++)
 743                         pg->osds[j] = ceph_decode_32(p);
 744
 745                 err = __insert_pg_mapping(pg, &map->pg_temp);
 746                 if (err)
 747                         goto bad;
 748                 dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid, len);
 749         }
 750
 751         /* crush */
 752         ceph_decode_32_safe(p, end, len, bad);
 753         dout("osdmap_decode crush len %d from off 0x%x\n", len,
 754              (int)(*p - start));
 755         ceph_decode_need(p, end, len, bad);
 756         map->crush = crush_decode(*p, end);
 757         *p += len;
 758         if (IS_ERR(map->crush)) {
 759                 err = PTR_ERR(map->crush);
 760                 map->crush = NULL;
 761                 goto bad;
 762         }
 763
 764         /* ignore the rest of the map */
 765         *p = end;
 766
 767         dout("osdmap_decode done %p %p\n", *p, end);
 768         return map;
 769
 770 bad:
 771         dout("osdmap_decode fail err %d\n", err);
 772         ceph_osdmap_destroy(map);
 773         return ERR_PTR(err);
 774 }
 775
 776 /*
 777  * decode and apply an incremental map update.
 778  */
 779 struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 780                                              struct ceph_osdmap *map,
 781                                              struct ceph_messenger *msgr)
 782 {
 783         struct crush_map *newcrush = NULL;
 784         struct ceph_fsid fsid;
 785         u32 epoch = 0;
 786         struct ceph_timespec modified;
 787         u32 len, pool;
 788         __s32 new_pool_max, new_flags, max;
 789         void *start = *p;
 790         int err = -EINVAL;
 791         u16 version;
 792
 793         ceph_decode_16_safe(p, end, version, bad);
 794         if (version > CEPH_OSDMAP_INC_VERSION) {
 795                 pr_warning("got unknown v %d > %d of inc osdmap\n", version,
 796                            CEPH_OSDMAP_INC_VERSION);
 797                 goto bad;
 798         }
 799
 800         ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
 801                          bad);
 802         ceph_decode_copy(p, &fsid, sizeof(fsid));
 803         epoch = ceph_decode_32(p);
 804         BUG_ON(epoch != map->epoch+1);
 805         ceph_decode_copy(p, &modified, sizeof(modified));
 806         new_pool_max = ceph_decode_32(p);
 807         new_flags = ceph_decode_32(p);
 808
 809         /* full map? */
 810         ceph_decode_32_safe(p, end, len, bad);
 811         if (len > 0) {
 812                 dout("apply_incremental full map len %d, %p to %p\n",
 813                      len, *p, end);
 814                 return osdmap_decode(p, min(*p+len, end));
 815         }
 816
 817         /* new crush? */
 818         ceph_decode_32_safe(p, end, len, bad);
 819         if (len > 0) {
 820                 dout("apply_incremental new crush map len %d, %p to %p\n",
 821                      len, *p, end);
 822                 newcrush = crush_decode(*p, min(*p+len, end));
 823                 if (IS_ERR(newcrush))
 824                         return ERR_CAST(newcrush);
 825                 *p += len;
 826         }
 827
 828         /* new flags? */
 829         if (new_flags >= 0)
 830                 map->flags = new_flags;
 831         if (new_pool_max >= 0)
 832                 map->pool_max = new_pool_max;
 833
 834         ceph_decode_need(p, end, 5*sizeof(u32), bad);
 835
 836         /* new max? */
 837         max = ceph_decode_32(p);
 838         if (max >= 0) {
 839                 err = osdmap_set_max_osd(map, max);
 840                 if (err < 0)
 841                         goto bad;
 842         }
 843
 844         map->epoch++;
 845         map->modified = modified;
 846         if (newcrush) {
 847                 if (map->crush)
 848                         crush_destroy(map->crush);
 849                 map->crush = newcrush;
 850                 newcrush = NULL;
 851         }
 852
 853         /* new_pool */
 854         ceph_decode_32_safe(p, end, len, bad);
 855         while (len--) {
 856                 __u8 ev;
 857                 struct ceph_pg_pool_info *pi;
 858
 859                 ceph_decode_32_safe(p, end, pool, bad);
 860                 ceph_decode_need(p, end, 1 + sizeof(pi->v), bad);
 861                 ev = ceph_decode_8(p);  /* encoding version */
 862                 if (ev > CEPH_PG_POOL_VERSION) {
 863                         pr_warning("got unknown v %d > %d of ceph_pg_pool\n",
 864                                    ev, CEPH_PG_POOL_VERSION);
 865                         err = -EINVAL;
 866                         goto bad;
 867                 }
 868                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 869                 if (!pi) {
 870                         pi = kzalloc(sizeof(*pi), GFP_NOFS);
 871                         if (!pi) {
 872                                 err = -ENOMEM;
 873                                 goto bad;
 874                         }
 875                         pi->id = pool;
 876                         __insert_pg_pool(&map->pg_pools, pi);
 877                 }
 878                 err = __decode_pool(p, end, pi);
 879                 if (err < 0)
 880                         goto bad;
 881         }
 882         if (version >= 5) {
 883                 err = __decode_pool_names(p, end, map);
 884                 if (err < 0)
 885                         goto bad;
 886         }
 887
 888         /* old_pool */
 889         ceph_decode_32_safe(p, end, len, bad);
 890         while (len--) {
 891                 struct ceph_pg_pool_info *pi;
 892
 893                 ceph_decode_32_safe(p, end, pool, bad);
 894                 pi = __lookup_pg_pool(&map->pg_pools, pool);
 895                 if (pi)
 896                         __remove_pg_pool(&map->pg_pools, pi);
 897         }
 898
 899         /* new_up */
 900         err = -EINVAL;
 901         ceph_decode_32_safe(p, end, len, bad);
 902         while (len--) {
 903                 u32 osd;
 904                 struct ceph_entity_addr addr;
 905                 ceph_decode_32_safe(p, end, osd, bad);
 906                 ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
 907                 ceph_decode_addr(&addr);
 908                 pr_info("osd%d up\n", osd);
 909                 BUG_ON(osd >= map->max_osd);
 910                 map->osd_state[osd] |= CEPH_OSD_UP;
 911                 map->osd_addr[osd] = addr;
 912         }
 913
 914         /* new_state */
 915         ceph_decode_32_safe(p, end, len, bad);
 916         while (len--) {
 917                 u32 osd;
 918                 u8 xorstate;
 919                 ceph_decode_32_safe(p, end, osd, bad);
 920                 xorstate = **(u8 **)p;
 921                 (*p)++;  /* clean flag */
 922                 if (xorstate == 0)
 923                         xorstate = CEPH_OSD_UP;
 924                 if (xorstate & CEPH_OSD_UP)
 925                         pr_info("osd%d down\n", osd);
 926                 if (osd < map->max_osd)
 927                         map->osd_state[osd] ^= xorstate;
 928         }
 929
 930         /* new_weight */
 931         ceph_decode_32_safe(p, end, len, bad);
 932         while (len--) {
 933                 u32 osd, off;
 934                 ceph_decode_need(p, end, sizeof(u32)*2, bad);
 935                 osd = ceph_decode_32(p);
 936                 off = ceph_decode_32(p);
 937                 pr_info("osd%d weight 0x%x %s\n", osd, off,
 938                      off == CEPH_OSD_IN ? "(in)" :
 939                      (off == CEPH_OSD_OUT ? "(out)" : ""));
 940                 if (osd < map->max_osd)
 941                         map->osd_weight[osd] = off;
 942         }
 943
 944         /* new_pg_temp */
 945         ceph_decode_32_safe(p, end, len, bad);
 946         while (len--) {
 947                 struct ceph_pg_mapping *pg;
 948                 int j;
 949                 struct ceph_pg pgid;
 950                 u32 pglen;
 951                 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
 952                 ceph_decode_copy(p, &pgid, sizeof(pgid));
 953                 pglen = ceph_decode_32(p);
 954
 955                 if (pglen) {
 956                         ceph_decode_need(p, end, pglen*sizeof(u32), bad);
 957
 958                         /* removing existing (if any) */
 959                         (void) __remove_pg_mapping(&map->pg_temp, pgid);
 960
 961                         /* insert */
 962                         err = -EINVAL;
 963                         if (pglen > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
 964                                 goto bad;
 965                         err = -ENOMEM;
 966                         pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
 967                         if (!pg)
 968                                 goto bad;
 969                         pg->pgid = pgid;
 970                         pg->len = pglen;
 971                         for (j = 0; j < pglen; j++)
 972                                 pg->osds[j] = ceph_decode_32(p);
 973                         err = __insert_pg_mapping(pg, &map->pg_temp);
 974                         if (err) {
 975                                 kfree(pg);
 976                                 goto bad;
 977                         }
 978                         dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,
 979                              pglen);
 980                 } else {
 981                         /* remove */
 982                         __remove_pg_mapping(&map->pg_temp, pgid);
 983                 }
 984         }
 985
 986         /* ignore the rest */
 987         *p = end;
 988         return map;
 989
 990 bad:
 991         pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
 992                epoch, (int)(*p - start), *p, start, end);
 993         print_hex_dump(KERN_DEBUG, "osdmap: ",
 994                        DUMP_PREFIX_OFFSET, 16, 1,
 995                        start, end - start, true);
 996         if (newcrush)
 997                 crush_destroy(newcrush);
 998         return ERR_PTR(err);
 999 }
1000
1001
1002
1003
1004 /*
1005  * calculate file layout from given offset, length.
1006  * fill in correct oid, logical length, and object extent
1007  * offset, length.
1008  *
1009  * for now, we write only a single su, until we can
1010  * pass a stride back to the caller.
1011  */
1012 int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
1013                                    u64 off, u64 *plen,
1014                                    u64 *ono,
1015                                    u64 *oxoff, u64 *oxlen)
1016 {
1017         u32 osize = le32_to_cpu(layout->fl_object_size);
1018         u32 su = le32_to_cpu(layout->fl_stripe_unit);
1019         u32 sc = le32_to_cpu(layout->fl_stripe_count);
1020         u32 bl, stripeno, stripepos, objsetno;
1021         u32 su_per_object;
1022         u64 t, su_offset;
1023
1024         dout("mapping %llu~%llu  osize %u fl_su %u\n", off, *plen,
1025              osize, su);
1026         if (su == 0 || sc == 0)
1027                 goto invalid;
1028         su_per_object = osize / su;
1029         if (su_per_object == 0)
1030                 goto invalid;
1031         dout("osize %u / su %u = su_per_object %u\n", osize, su,
1032              su_per_object);
1033
1034         if ((su & ~PAGE_MASK) != 0)
1035                 goto invalid;
1036
1037         /* bl = *off / su; */
1038         t = off;
1039         do_div(t, su);
1040         bl = t;
1041         dout("off %llu / su %u = bl %u\n", off, su, bl);
1042
1043         stripeno = bl / sc;
1044         stripepos = bl % sc;
1045         objsetno = stripeno / su_per_object;
1046
1047         *ono = objsetno * sc + stripepos;
1048         dout("objset %u * sc %u = ono %u\n", objsetno, sc, (unsigned int)*ono);
1049
1050         /* *oxoff = *off % layout->fl_stripe_unit;  # offset in su */
1051         t = off;
1052         su_offset = do_div(t, su);
1053         *oxoff = su_offset + (stripeno % su_per_object) * su;
1054
1055         /*
1056          * Calculate the length of the extent being written to the selected
1057          * object. This is the minimum of the full length requested (plen) or
1058          * the remainder of the current stripe being written to.
1059          */
1060         *oxlen = min_t(u64, *plen, su - su_offset);
1061         *plen = *oxlen;
1062
1063         dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
1064         return 0;
1065
1066 invalid:
1067         dout(" invalid layout\n");
1068         *ono = 0;
1069         *oxoff = 0;
1070         *oxlen = 0;
1071         return -EINVAL;
1072 }
1073 EXPORT_SYMBOL(ceph_calc_file_object_mapping);
1074
1075 /*
1076  * calculate an object layout (i.e. pgid) from an oid,
1077  * file_layout, and osdmap
1078  */
1079 int ceph_calc_object_layout(struct ceph_object_layout *ol,
1080                             const char *oid,
1081                             struct ceph_file_layout *fl,
1082                             struct ceph_osdmap *osdmap)
1083 {
1084         unsigned int num, num_mask;
1085         struct ceph_pg pgid;
1086         int poolid = le32_to_cpu(fl->fl_pg_pool);
1087         struct ceph_pg_pool_info *pool;
1088         unsigned int ps;
1089
1090         BUG_ON(!osdmap);
1091
1092         pool = __lookup_pg_pool(&osdmap->pg_pools, poolid);
1093         if (!pool)
1094                 return -EIO;
1095         ps = ceph_str_hash(pool->v.object_hash, oid, strlen(oid));
1096         num = le32_to_cpu(pool->v.pg_num);
1097         num_mask = pool->pg_num_mask;
1098
1099         pgid.ps = cpu_to_le16(ps);
1100         pgid.preferred = cpu_to_le16(-1);
1101         pgid.pool = fl->fl_pg_pool;
1102         dout("calc_object_layout '%s' pgid %d.%x\n", oid, poolid, ps);
1103
1104         ol->ol_pgid = pgid;
1105         ol->ol_stripe_unit = fl->fl_object_stripe_unit;
1106         return 0;
1107 }
1108 EXPORT_SYMBOL(ceph_calc_object_layout);
1109
1110 /*
1111  * Calculate raw osd vector for the given pgid.  Return pointer to osd
1112  * array, or NULL on failure.
1113  */
1114 static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
1115                         int *osds, int *num)
1116 {
1117         struct ceph_pg_mapping *pg;
1118         struct ceph_pg_pool_info *pool;
1119         int ruleno;
1120         unsigned int poolid, ps, pps, t, r;
1121
1122         poolid = le32_to_cpu(pgid.pool);
1123         ps = le16_to_cpu(pgid.ps);
1124
1125         pool = __lookup_pg_pool(&osdmap->pg_pools, poolid);
1126         if (!pool)
1127                 return NULL;
1128
1129         /* pg_temp? */
1130         t = ceph_stable_mod(ps, le32_to_cpu(pool->v.pg_num),
1131                             pool->pgp_num_mask);
1132         pgid.ps = cpu_to_le16(t);
1133         pg = __lookup_pg_mapping(&osdmap->pg_temp, pgid);
1134         if (pg) {
1135                 *num = pg->len;
1136                 return pg->osds;
1137         }
1138
1139         /* crush */
1140         ruleno = crush_find_rule(osdmap->crush, pool->v.crush_ruleset,
1141                                  pool->v.type, pool->v.size);
1142         if (ruleno < 0) {
1143                 pr_err("no crush rule pool %d ruleset %d type %d size %d\n",
1144                        poolid, pool->v.crush_ruleset, pool->v.type,
1145                        pool->v.size);
1146                 return NULL;
1147         }
1148
1149         pps = ceph_stable_mod(ps,
1150                               le32_to_cpu(pool->v.pgp_num),
1151                               pool->pgp_num_mask);
1152         pps += poolid;
1153         r = crush_do_rule(osdmap->crush, ruleno, pps, osds,
1154                           min_t(int, pool->v.size, *num),
1155                           osdmap->osd_weight);
1156         if (r < 0) {
1157                 pr_err("error %d from crush rule: pool %d ruleset %d type %d"
1158                        " size %d\n", r, poolid, pool->v.crush_ruleset,
1159                        pool->v.type, pool->v.size);
1160                 return NULL;
1161         }
1162         *num = r;
1163         return osds;
1164 }
1165
1166 /*
1167  * Return acting set for given pgid.
1168  */
1169 int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
1170                         int *acting)
1171 {
1172         int rawosds[CEPH_PG_MAX_SIZE], *osds;
1173         int i, o, num = CEPH_PG_MAX_SIZE;
1174
1175         osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
1176         if (!osds)
1177                 return -1;
1178
1179         /* primary is first up osd */
1180         o = 0;
1181         for (i = 0; i < num; i++)
1182                 if (ceph_osd_is_up(osdmap, osds[i]))
1183                         acting[o++] = osds[i];
1184         return o;
1185 }
1186
1187 /*
1188  * Return primary osd for given pgid, or -1 if none.
1189  */
1190 int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, struct ceph_pg pgid)
1191 {
1192         int rawosds[CEPH_PG_MAX_SIZE], *osds;
1193         int i, 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         for (i = 0; i < num; i++)
1201                 if (ceph_osd_is_up(osdmap, osds[i]))
1202                         return osds[i];
1203         return -1;
1204 }
1205 EXPORT_SYMBOL(ceph_calc_pg_primary);