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