git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/disk_groups.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcachefs.h"
   3 #include "disk_groups.h"
   4 #include "sb-members.h"
   5 #include "super-io.h"
   6
   7 #include <linux/sort.h>
   8
   9 static int group_cmp(const void *_l, const void *_r)
  10 {
  11         const struct bch_disk_group *l = _l;
  12         const struct bch_disk_group *r = _r;
  13
  14         return ((BCH_GROUP_DELETED(l) > BCH_GROUP_DELETED(r)) -
  15                 (BCH_GROUP_DELETED(l) < BCH_GROUP_DELETED(r))) ?:
  16                 ((BCH_GROUP_PARENT(l) > BCH_GROUP_PARENT(r)) -
  17                  (BCH_GROUP_PARENT(l) < BCH_GROUP_PARENT(r))) ?:
  18                 strncmp(l->label, r->label, sizeof(l->label));
  19 }
  20
  21 static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
  22                                         struct bch_sb_field *f,
  23                                         struct printbuf *err)
  24 {
  25         struct bch_sb_field_disk_groups *groups =
  26                 field_to_type(f, disk_groups);
  27         struct bch_disk_group *g, *sorted = NULL;
  28         unsigned nr_groups = disk_groups_nr(groups);
  29         unsigned i, len;
  30         int ret = 0;
  31
  32         for (i = 0; i < sb->nr_devices; i++) {
  33                 struct bch_member m = bch2_sb_member_get(sb, i);
  34                 unsigned group_id;
  35
  36                 if (!BCH_MEMBER_GROUP(&m))
  37                         continue;
  38
  39                 group_id = BCH_MEMBER_GROUP(&m) - 1;
  40
  41                 if (group_id >= nr_groups) {
  42                         prt_printf(err, "disk %u has invalid label %u (have %u)",
  43                                    i, group_id, nr_groups);
  44                         return -BCH_ERR_invalid_sb_disk_groups;
  45                 }
  46
  47                 if (BCH_GROUP_DELETED(&groups->entries[group_id])) {
  48                         prt_printf(err, "disk %u has deleted label %u", i, group_id);
  49                         return -BCH_ERR_invalid_sb_disk_groups;
  50                 }
  51         }
  52
  53         if (!nr_groups)
  54                 return 0;
  55
  56         for (i = 0; i < nr_groups; i++) {
  57                 g = groups->entries + i;
  58
  59                 if (BCH_GROUP_DELETED(g))
  60                         continue;
  61
  62                 len = strnlen(g->label, sizeof(g->label));
  63                 if (!len) {
  64                         prt_printf(err, "label %u empty", i);
  65                         return -BCH_ERR_invalid_sb_disk_groups;
  66                 }
  67         }
  68
  69         sorted = kmalloc_array(nr_groups, sizeof(*sorted), GFP_KERNEL);
  70         if (!sorted)
  71                 return -BCH_ERR_ENOMEM_disk_groups_validate;
  72
  73         memcpy(sorted, groups->entries, nr_groups * sizeof(*sorted));
  74         sort(sorted, nr_groups, sizeof(*sorted), group_cmp, NULL);
  75
  76         for (g = sorted; g + 1 < sorted + nr_groups; g++)
  77                 if (!BCH_GROUP_DELETED(g) &&
  78                     !group_cmp(&g[0], &g[1])) {
  79                         prt_printf(err, "duplicate label %llu.%.*s",
  80                                BCH_GROUP_PARENT(g),
  81                                (int) sizeof(g->label), g->label);
  82                         ret = -BCH_ERR_invalid_sb_disk_groups;
  83                         goto err;
  84                 }
  85 err:
  86         kfree(sorted);
  87         return ret;
  88 }
  89
  90 void bch2_disk_groups_to_text(struct printbuf *out, struct bch_fs *c)
  91 {
  92         struct bch_disk_groups_cpu *g;
  93         struct bch_dev *ca;
  94         int i;
  95         unsigned iter;
  96
  97         out->atomic++;
  98         rcu_read_lock();
  99
 100         g = rcu_dereference(c->disk_groups);
 101         if (!g)
 102                 goto out;
 103
 104         for (i = 0; i < g->nr; i++) {
 105                 if (i)
 106                         prt_printf(out, " ");
 107
 108                 if (g->entries[i].deleted) {
 109                         prt_printf(out, "[deleted]");
 110                         continue;
 111                 }
 112
 113                 prt_printf(out, "[parent %d devs", g->entries[i].parent);
 114                 for_each_member_device_rcu(ca, c, iter, &g->entries[i].devs)
 115                         prt_printf(out, " %s", ca->name);
 116                 prt_printf(out, "]");
 117         }
 118
 119 out:
 120         rcu_read_unlock();
 121         out->atomic--;
 122 }
 123
 124 static void bch2_sb_disk_groups_to_text(struct printbuf *out,
 125                                         struct bch_sb *sb,
 126                                         struct bch_sb_field *f)
 127 {
 128         struct bch_sb_field_disk_groups *groups =
 129                 field_to_type(f, disk_groups);
 130         struct bch_disk_group *g;
 131         unsigned nr_groups = disk_groups_nr(groups);
 132
 133         for (g = groups->entries;
 134              g < groups->entries + nr_groups;
 135              g++) {
 136                 if (g != groups->entries)
 137                         prt_printf(out, " ");
 138
 139                 if (BCH_GROUP_DELETED(g))
 140                         prt_printf(out, "[deleted]");
 141                 else
 142                         prt_printf(out, "[parent %llu name %s]",
 143                                BCH_GROUP_PARENT(g), g->label);
 144         }
 145 }
 146
 147 const struct bch_sb_field_ops bch_sb_field_ops_disk_groups = {
 148         .validate       = bch2_sb_disk_groups_validate,
 149         .to_text        = bch2_sb_disk_groups_to_text
 150 };
 151
 152 int bch2_sb_disk_groups_to_cpu(struct bch_fs *c)
 153 {
 154         struct bch_sb_field_disk_groups *groups;
 155         struct bch_disk_groups_cpu *cpu_g, *old_g;
 156         unsigned i, g, nr_groups;
 157
 158         lockdep_assert_held(&c->sb_lock);
 159
 160         groups          = bch2_sb_field_get(c->disk_sb.sb, disk_groups);
 161         nr_groups       = disk_groups_nr(groups);
 162
 163         if (!groups)
 164                 return 0;
 165
 166         cpu_g = kzalloc(struct_size(cpu_g, entries, nr_groups), GFP_KERNEL);
 167         if (!cpu_g)
 168                 return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
 169
 170         cpu_g->nr = nr_groups;
 171
 172         for (i = 0; i < nr_groups; i++) {
 173                 struct bch_disk_group *src      = &groups->entries[i];
 174                 struct bch_disk_group_cpu *dst  = &cpu_g->entries[i];
 175
 176                 dst->deleted    = BCH_GROUP_DELETED(src);
 177                 dst->parent     = BCH_GROUP_PARENT(src);
 178         }
 179
 180         for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
 181                 struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, i);
 182                 struct bch_disk_group_cpu *dst;
 183
 184                 if (!bch2_member_exists(&m))
 185                         continue;
 186
 187                 g = BCH_MEMBER_GROUP(&m);
 188                 while (g) {
 189                         dst = &cpu_g->entries[g - 1];
 190                         __set_bit(i, dst->devs.d);
 191                         g = dst->parent;
 192                 }
 193         }
 194
 195         old_g = rcu_dereference_protected(c->disk_groups,
 196                                 lockdep_is_held(&c->sb_lock));
 197         rcu_assign_pointer(c->disk_groups, cpu_g);
 198         if (old_g)
 199                 kfree_rcu(old_g, rcu);
 200
 201         return 0;
 202 }
 203
 204 const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
 205 {
 206         struct target t = target_decode(target);
 207         struct bch_devs_mask *devs;
 208
 209         rcu_read_lock();
 210
 211         switch (t.type) {
 212         case TARGET_NULL:
 213                 devs = NULL;
 214                 break;
 215         case TARGET_DEV: {
 216                 struct bch_dev *ca = t.dev < c->sb.nr_devices
 217                         ? rcu_dereference(c->devs[t.dev])
 218                         : NULL;
 219                 devs = ca ? &ca->self : NULL;
 220                 break;
 221         }
 222         case TARGET_GROUP: {
 223                 struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
 224
 225                 devs = g && t.group < g->nr && !g->entries[t.group].deleted
 226                         ? &g->entries[t.group].devs
 227                         : NULL;
 228                 break;
 229         }
 230         default:
 231                 BUG();
 232         }
 233
 234         rcu_read_unlock();
 235
 236         return devs;
 237 }
 238
 239 bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
 240 {
 241         struct target t = target_decode(target);
 242
 243         switch (t.type) {
 244         case TARGET_NULL:
 245                 return false;
 246         case TARGET_DEV:
 247                 return dev == t.dev;
 248         case TARGET_GROUP: {
 249                 struct bch_disk_groups_cpu *g;
 250                 const struct bch_devs_mask *m;
 251                 bool ret;
 252
 253                 rcu_read_lock();
 254                 g = rcu_dereference(c->disk_groups);
 255                 m = g && t.group < g->nr && !g->entries[t.group].deleted
 256                         ? &g->entries[t.group].devs
 257                         : NULL;
 258
 259                 ret = m ? test_bit(dev, m->d) : false;
 260                 rcu_read_unlock();
 261
 262                 return ret;
 263         }
 264         default:
 265                 BUG();
 266         }
 267 }
 268
 269 static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
 270                                   unsigned parent,
 271                                   const char *name, unsigned namelen)
 272 {
 273         unsigned i, nr_groups = disk_groups_nr(groups);
 274
 275         if (!namelen || namelen > BCH_SB_LABEL_SIZE)
 276                 return -EINVAL;
 277
 278         for (i = 0; i < nr_groups; i++) {
 279                 struct bch_disk_group *g = groups->entries + i;
 280
 281                 if (BCH_GROUP_DELETED(g))
 282                         continue;
 283
 284                 if (!BCH_GROUP_DELETED(g) &&
 285                     BCH_GROUP_PARENT(g) == parent &&
 286                     strnlen(g->label, sizeof(g->label)) == namelen &&
 287                     !memcmp(name, g->label, namelen))
 288                         return i;
 289         }
 290
 291         return -1;
 292 }
 293
 294 static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
 295                                  const char *name, unsigned namelen)
 296 {
 297         struct bch_sb_field_disk_groups *groups =
 298                 bch2_sb_field_get(sb->sb, disk_groups);
 299         unsigned i, nr_groups = disk_groups_nr(groups);
 300         struct bch_disk_group *g;
 301
 302         if (!namelen || namelen > BCH_SB_LABEL_SIZE)
 303                 return -EINVAL;
 304
 305         for (i = 0;
 306              i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
 307              i++)
 308                 ;
 309
 310         if (i == nr_groups) {
 311                 unsigned u64s =
 312                         (sizeof(struct bch_sb_field_disk_groups) +
 313                          sizeof(struct bch_disk_group) * (nr_groups + 1)) /
 314                         sizeof(u64);
 315
 316                 groups = bch2_sb_field_resize(sb, disk_groups, u64s);
 317                 if (!groups)
 318                         return -BCH_ERR_ENOSPC_disk_label_add;
 319
 320                 nr_groups = disk_groups_nr(groups);
 321         }
 322
 323         BUG_ON(i >= nr_groups);
 324
 325         g = &groups->entries[i];
 326
 327         memcpy(g->label, name, namelen);
 328         if (namelen < sizeof(g->label))
 329                 g->label[namelen] = '\0';
 330         SET_BCH_GROUP_DELETED(g, 0);
 331         SET_BCH_GROUP_PARENT(g, parent);
 332         SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
 333
 334         return i;
 335 }
 336
 337 int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
 338 {
 339         struct bch_sb_field_disk_groups *groups =
 340                 bch2_sb_field_get(sb->sb, disk_groups);
 341         int v = -1;
 342
 343         do {
 344                 const char *next = strchrnul(name, '.');
 345                 unsigned len = next - name;
 346
 347                 if (*next == '.')
 348                         next++;
 349
 350                 v = __bch2_disk_group_find(groups, v + 1, name, len);
 351                 name = next;
 352         } while (*name && v >= 0);
 353
 354         return v;
 355 }
 356
 357 int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
 358 {
 359         struct bch_sb_field_disk_groups *groups;
 360         unsigned parent = 0;
 361         int v = -1;
 362
 363         do {
 364                 const char *next = strchrnul(name, '.');
 365                 unsigned len = next - name;
 366
 367                 if (*next == '.')
 368                         next++;
 369
 370                 groups = bch2_sb_field_get(sb->sb, disk_groups);
 371
 372                 v = __bch2_disk_group_find(groups, parent, name, len);
 373                 if (v < 0)
 374                         v = __bch2_disk_group_add(sb, parent, name, len);
 375                 if (v < 0)
 376                         return v;
 377
 378                 parent = v + 1;
 379                 name = next;
 380         } while (*name && v >= 0);
 381
 382         return v;
 383 }
 384
 385 void bch2_disk_path_to_text(struct printbuf *out, struct bch_sb *sb, unsigned v)
 386 {
 387         struct bch_sb_field_disk_groups *groups =
 388                 bch2_sb_field_get(sb, disk_groups);
 389         struct bch_disk_group *g;
 390         unsigned nr = 0;
 391         u16 path[32];
 392
 393         while (1) {
 394                 if (nr == ARRAY_SIZE(path))
 395                         goto inval;
 396
 397                 if (v >= disk_groups_nr(groups))
 398                         goto inval;
 399
 400                 g = groups->entries + v;
 401
 402                 if (BCH_GROUP_DELETED(g))
 403                         goto inval;
 404
 405                 path[nr++] = v;
 406
 407                 if (!BCH_GROUP_PARENT(g))
 408                         break;
 409
 410                 v = BCH_GROUP_PARENT(g) - 1;
 411         }
 412
 413         while (nr) {
 414                 v = path[--nr];
 415                 g = groups->entries + v;
 416
 417                 prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
 418                 if (nr)
 419                         prt_printf(out, ".");
 420         }
 421         return;
 422 inval:
 423         prt_printf(out, "invalid label %u", v);
 424 }
 425
 426 int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
 427 {
 428         struct bch_member *mi;
 429         int ret, v = -1;
 430
 431         if (!strlen(name) || !strcmp(name, "none"))
 432                 return 0;
 433
 434         v = bch2_disk_path_find_or_create(&c->disk_sb, name);
 435         if (v < 0)
 436                 return v;
 437
 438         ret = bch2_sb_disk_groups_to_cpu(c);
 439         if (ret)
 440                 return ret;
 441
 442         mi = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
 443         SET_BCH_MEMBER_GROUP(mi, v + 1);
 444         return 0;
 445 }
 446
 447 int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
 448 {
 449         int ret;
 450
 451         mutex_lock(&c->sb_lock);
 452         ret = __bch2_dev_group_set(c, ca, name) ?:
 453                 bch2_write_super(c);
 454         mutex_unlock(&c->sb_lock);
 455
 456         return ret;
 457 }
 458
 459 int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
 460                           struct printbuf *err)
 461 {
 462         struct bch_dev *ca;
 463         int g;
 464
 465         if (!val)
 466                 return -EINVAL;
 467
 468         if (!c)
 469                 return 0;
 470
 471         if (!strlen(val) || !strcmp(val, "none")) {
 472                 *res = 0;
 473                 return 0;
 474         }
 475
 476         /* Is it a device? */
 477         ca = bch2_dev_lookup(c, val);
 478         if (!IS_ERR(ca)) {
 479                 *res = dev_to_target(ca->dev_idx);
 480                 percpu_ref_put(&ca->ref);
 481                 return 0;
 482         }
 483
 484         mutex_lock(&c->sb_lock);
 485         g = bch2_disk_path_find(&c->disk_sb, val);
 486         mutex_unlock(&c->sb_lock);
 487
 488         if (g >= 0) {
 489                 *res = group_to_target(g);
 490                 return 0;
 491         }
 492
 493         return -EINVAL;
 494 }
 495
 496 void bch2_opt_target_to_text(struct printbuf *out,
 497                              struct bch_fs *c,
 498                              struct bch_sb *sb,
 499                              u64 v)
 500 {
 501         struct target t = target_decode(v);
 502
 503         switch (t.type) {
 504         case TARGET_NULL:
 505                 prt_printf(out, "none");
 506                 break;
 507         case TARGET_DEV:
 508                 if (c) {
 509                         struct bch_dev *ca;
 510
 511                         rcu_read_lock();
 512                         ca = t.dev < c->sb.nr_devices
 513                                 ? rcu_dereference(c->devs[t.dev])
 514                                 : NULL;
 515
 516                         if (ca && percpu_ref_tryget(&ca->io_ref)) {
 517                                 prt_printf(out, "/dev/%pg", ca->disk_sb.bdev);
 518                                 percpu_ref_put(&ca->io_ref);
 519                         } else if (ca) {
 520                                 prt_printf(out, "offline device %u", t.dev);
 521                         } else {
 522                                 prt_printf(out, "invalid device %u", t.dev);
 523                         }
 524
 525                         rcu_read_unlock();
 526                 } else {
 527                         struct bch_member m = bch2_sb_member_get(sb, t.dev);
 528
 529                         if (bch2_dev_exists(sb, t.dev)) {
 530                                 prt_printf(out, "Device ");
 531                                 pr_uuid(out, m.uuid.b);
 532                                 prt_printf(out, " (%u)", t.dev);
 533                         } else {
 534                                 prt_printf(out, "Bad device %u", t.dev);
 535                         }
 536                 }
 537                 break;
 538         case TARGET_GROUP:
 539                 if (c) {
 540                         mutex_lock(&c->sb_lock);
 541                         bch2_disk_path_to_text(out, c->disk_sb.sb, t.group);
 542                         mutex_unlock(&c->sb_lock);
 543                 } else {
 544                         bch2_disk_path_to_text(out, sb, t.group);
 545                 }
 546                 break;
 547         default:
 548                 BUG();
 549         }
 550 }