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_get_disk_groups(c->disk_sb.sb);
 161         nr_groups       = disk_groups_nr(groups);
 162
 163         if (!groups)
 164                 return 0;
 165
 166         cpu_g = kzalloc(sizeof(*cpu_g) +
 167                         sizeof(cpu_g->entries[0]) * nr_groups, GFP_KERNEL);
 168         if (!cpu_g)
 169                 return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
 170
 171         cpu_g->nr = nr_groups;
 172
 173         for (i = 0; i < nr_groups; i++) {
 174                 struct bch_disk_group *src      = &groups->entries[i];
 175                 struct bch_disk_group_cpu *dst  = &cpu_g->entries[i];
 176
 177                 dst->deleted    = BCH_GROUP_DELETED(src);
 178                 dst->parent     = BCH_GROUP_PARENT(src);
 179         }
 180
 181         for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
 182                 struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, i);
 183                 struct bch_disk_group_cpu *dst;
 184
 185                 if (!bch2_member_exists(&m))
 186                         continue;
 187
 188                 g = BCH_MEMBER_GROUP(&m);
 189                 while (g) {
 190                         dst = &cpu_g->entries[g - 1];
 191                         __set_bit(i, dst->devs.d);
 192                         g = dst->parent;
 193                 }
 194         }
 195
 196         old_g = rcu_dereference_protected(c->disk_groups,
 197                                 lockdep_is_held(&c->sb_lock));
 198         rcu_assign_pointer(c->disk_groups, cpu_g);
 199         if (old_g)
 200                 kfree_rcu(old_g, rcu);
 201
 202         return 0;
 203 }
 204
 205 const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
 206 {
 207         struct target t = target_decode(target);
 208         struct bch_devs_mask *devs;
 209
 210         rcu_read_lock();
 211
 212         switch (t.type) {
 213         case TARGET_NULL:
 214                 devs = NULL;
 215                 break;
 216         case TARGET_DEV: {
 217                 struct bch_dev *ca = t.dev < c->sb.nr_devices
 218                         ? rcu_dereference(c->devs[t.dev])
 219                         : NULL;
 220                 devs = ca ? &ca->self : NULL;
 221                 break;
 222         }
 223         case TARGET_GROUP: {
 224                 struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
 225
 226                 devs = g && t.group < g->nr && !g->entries[t.group].deleted
 227                         ? &g->entries[t.group].devs
 228                         : NULL;
 229                 break;
 230         }
 231         default:
 232                 BUG();
 233         }
 234
 235         rcu_read_unlock();
 236
 237         return devs;
 238 }
 239
 240 bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
 241 {
 242         struct target t = target_decode(target);
 243
 244         switch (t.type) {
 245         case TARGET_NULL:
 246                 return false;
 247         case TARGET_DEV:
 248                 return dev == t.dev;
 249         case TARGET_GROUP: {
 250                 struct bch_disk_groups_cpu *g;
 251                 const struct bch_devs_mask *m;
 252                 bool ret;
 253
 254                 rcu_read_lock();
 255                 g = rcu_dereference(c->disk_groups);
 256                 m = g && t.group < g->nr && !g->entries[t.group].deleted
 257                         ? &g->entries[t.group].devs
 258                         : NULL;
 259
 260                 ret = m ? test_bit(dev, m->d) : false;
 261                 rcu_read_unlock();
 262
 263                 return ret;
 264         }
 265         default:
 266                 BUG();
 267         }
 268 }
 269
 270 static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
 271                                   unsigned parent,
 272                                   const char *name, unsigned namelen)
 273 {
 274         unsigned i, nr_groups = disk_groups_nr(groups);
 275
 276         if (!namelen || namelen > BCH_SB_LABEL_SIZE)
 277                 return -EINVAL;
 278
 279         for (i = 0; i < nr_groups; i++) {
 280                 struct bch_disk_group *g = groups->entries + i;
 281
 282                 if (BCH_GROUP_DELETED(g))
 283                         continue;
 284
 285                 if (!BCH_GROUP_DELETED(g) &&
 286                     BCH_GROUP_PARENT(g) == parent &&
 287                     strnlen(g->label, sizeof(g->label)) == namelen &&
 288                     !memcmp(name, g->label, namelen))
 289                         return i;
 290         }
 291
 292         return -1;
 293 }
 294
 295 static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
 296                                  const char *name, unsigned namelen)
 297 {
 298         struct bch_sb_field_disk_groups *groups =
 299                 bch2_sb_get_disk_groups(sb->sb);
 300         unsigned i, nr_groups = disk_groups_nr(groups);
 301         struct bch_disk_group *g;
 302
 303         if (!namelen || namelen > BCH_SB_LABEL_SIZE)
 304                 return -EINVAL;
 305
 306         for (i = 0;
 307              i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
 308              i++)
 309                 ;
 310
 311         if (i == nr_groups) {
 312                 unsigned u64s =
 313                         (sizeof(struct bch_sb_field_disk_groups) +
 314                          sizeof(struct bch_disk_group) * (nr_groups + 1)) /
 315                         sizeof(u64);
 316
 317                 groups = bch2_sb_resize_disk_groups(sb, u64s);
 318                 if (!groups)
 319                         return -BCH_ERR_ENOSPC_disk_label_add;
 320
 321                 nr_groups = disk_groups_nr(groups);
 322         }
 323
 324         BUG_ON(i >= nr_groups);
 325
 326         g = &groups->entries[i];
 327
 328         memcpy(g->label, name, namelen);
 329         if (namelen < sizeof(g->label))
 330                 g->label[namelen] = '\0';
 331         SET_BCH_GROUP_DELETED(g, 0);
 332         SET_BCH_GROUP_PARENT(g, parent);
 333         SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
 334
 335         return i;
 336 }
 337
 338 int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
 339 {
 340         struct bch_sb_field_disk_groups *groups =
 341                 bch2_sb_get_disk_groups(sb->sb);
 342         int v = -1;
 343
 344         do {
 345                 const char *next = strchrnul(name, '.');
 346                 unsigned len = next - name;
 347
 348                 if (*next == '.')
 349                         next++;
 350
 351                 v = __bch2_disk_group_find(groups, v + 1, name, len);
 352                 name = next;
 353         } while (*name && v >= 0);
 354
 355         return v;
 356 }
 357
 358 int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
 359 {
 360         struct bch_sb_field_disk_groups *groups;
 361         unsigned parent = 0;
 362         int v = -1;
 363
 364         do {
 365                 const char *next = strchrnul(name, '.');
 366                 unsigned len = next - name;
 367
 368                 if (*next == '.')
 369                         next++;
 370
 371                 groups = bch2_sb_get_disk_groups(sb->sb);
 372
 373                 v = __bch2_disk_group_find(groups, parent, name, len);
 374                 if (v < 0)
 375                         v = __bch2_disk_group_add(sb, parent, name, len);
 376                 if (v < 0)
 377                         return v;
 378
 379                 parent = v + 1;
 380                 name = next;
 381         } while (*name && v >= 0);
 382
 383         return v;
 384 }
 385
 386 void bch2_disk_path_to_text(struct printbuf *out, struct bch_sb *sb, unsigned v)
 387 {
 388         struct bch_sb_field_disk_groups *groups =
 389                 bch2_sb_get_disk_groups(sb);
 390         struct bch_disk_group *g;
 391         unsigned nr = 0;
 392         u16 path[32];
 393
 394         while (1) {
 395                 if (nr == ARRAY_SIZE(path))
 396                         goto inval;
 397
 398                 if (v >= disk_groups_nr(groups))
 399                         goto inval;
 400
 401                 g = groups->entries + v;
 402
 403                 if (BCH_GROUP_DELETED(g))
 404                         goto inval;
 405
 406                 path[nr++] = v;
 407
 408                 if (!BCH_GROUP_PARENT(g))
 409                         break;
 410
 411                 v = BCH_GROUP_PARENT(g) - 1;
 412         }
 413
 414         while (nr) {
 415                 v = path[--nr];
 416                 g = groups->entries + v;
 417
 418                 prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
 419                 if (nr)
 420                         prt_printf(out, ".");
 421         }
 422         return;
 423 inval:
 424         prt_printf(out, "invalid label %u", v);
 425 }
 426
 427 int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
 428 {
 429         struct bch_member *mi;
 430         int ret, v = -1;
 431
 432         if (!strlen(name) || !strcmp(name, "none"))
 433                 return 0;
 434
 435         v = bch2_disk_path_find_or_create(&c->disk_sb, name);
 436         if (v < 0)
 437                 return v;
 438
 439         ret = bch2_sb_disk_groups_to_cpu(c);
 440         if (ret)
 441                 return ret;
 442
 443         mi = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
 444         SET_BCH_MEMBER_GROUP(mi, v + 1);
 445         return 0;
 446 }
 447
 448 int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
 449 {
 450         int ret;
 451
 452         mutex_lock(&c->sb_lock);
 453         ret = __bch2_dev_group_set(c, ca, name) ?:
 454                 bch2_write_super(c);
 455         mutex_unlock(&c->sb_lock);
 456
 457         return ret;
 458 }
 459
 460 int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
 461                           struct printbuf *err)
 462 {
 463         struct bch_dev *ca;
 464         int g;
 465
 466         if (!val)
 467                 return -EINVAL;
 468
 469         if (!c)
 470                 return 0;
 471
 472         if (!strlen(val) || !strcmp(val, "none")) {
 473                 *res = 0;
 474                 return 0;
 475         }
 476
 477         /* Is it a device? */
 478         ca = bch2_dev_lookup(c, val);
 479         if (!IS_ERR(ca)) {
 480                 *res = dev_to_target(ca->dev_idx);
 481                 percpu_ref_put(&ca->ref);
 482                 return 0;
 483         }
 484
 485         mutex_lock(&c->sb_lock);
 486         g = bch2_disk_path_find(&c->disk_sb, val);
 487         mutex_unlock(&c->sb_lock);
 488
 489         if (g >= 0) {
 490                 *res = group_to_target(g);
 491                 return 0;
 492         }
 493
 494         return -EINVAL;
 495 }
 496
 497 void bch2_opt_target_to_text(struct printbuf *out,
 498                              struct bch_fs *c,
 499                              struct bch_sb *sb,
 500                              u64 v)
 501 {
 502         struct target t = target_decode(v);
 503
 504         switch (t.type) {
 505         case TARGET_NULL:
 506                 prt_printf(out, "none");
 507                 break;
 508         case TARGET_DEV:
 509                 if (c) {
 510                         struct bch_dev *ca;
 511
 512                         rcu_read_lock();
 513                         ca = t.dev < c->sb.nr_devices
 514                                 ? rcu_dereference(c->devs[t.dev])
 515                                 : NULL;
 516
 517                         if (ca && percpu_ref_tryget(&ca->io_ref)) {
 518                                 prt_printf(out, "/dev/%pg", ca->disk_sb.bdev);
 519                                 percpu_ref_put(&ca->io_ref);
 520                         } else if (ca) {
 521                                 prt_printf(out, "offline device %u", t.dev);
 522                         } else {
 523                                 prt_printf(out, "invalid device %u", t.dev);
 524                         }
 525
 526                         rcu_read_unlock();
 527                 } else {
 528                         struct bch_member m = bch2_sb_member_get(sb, t.dev);
 529
 530                         if (bch2_dev_exists(sb, t.dev)) {
 531                                 prt_printf(out, "Device ");
 532                                 pr_uuid(out, m.uuid.b);
 533                                 prt_printf(out, " (%u)", t.dev);
 534                         } else {
 535                                 prt_printf(out, "Bad device %u", t.dev);
 536                         }
 537                 }
 538                 break;
 539         case TARGET_GROUP:
 540                 if (c) {
 541                         mutex_lock(&c->sb_lock);
 542                         bch2_disk_path_to_text(out, c->disk_sb.sb, t.group);
 543                         mutex_unlock(&c->sb_lock);
 544                 } else {
 545                         bch2_disk_path_to_text(out, sb, t.group);
 546                 }
 547                 break;
 548         default:
 549                 BUG();
 550         }
 551 }