fs/bcachefs/xattr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "acl.h"
   5 #include "bkey_methods.h"
   6 #include "btree_update.h"
   7 #include "extents.h"
   8 #include "fs.h"
   9 #include "rebalance.h"
  10 #include "str_hash.h"
  11 #include "xattr.h"
  12
  13 #include <linux/dcache.h>
  14 #include <linux/posix_acl_xattr.h>
  15 #include <linux/xattr.h>
  16
  17 static const struct xattr_handler *bch2_xattr_type_to_handler(unsigned);
  18
  19 static u64 bch2_xattr_hash(const struct bch_hash_info *info,
  20                           const struct xattr_search_key *key)
  21 {
  22         struct bch_str_hash_ctx ctx;
  23
  24         bch2_str_hash_init(&ctx, info);
  25         bch2_str_hash_update(&ctx, info, &key->type, sizeof(key->type));
  26         bch2_str_hash_update(&ctx, info, key->name.name, key->name.len);
  27
  28         return bch2_str_hash_end(&ctx, info);
  29 }
  30
  31 static u64 xattr_hash_key(const struct bch_hash_info *info, const void *key)
  32 {
  33         return bch2_xattr_hash(info, key);
  34 }
  35
  36 static u64 xattr_hash_bkey(const struct bch_hash_info *info, struct bkey_s_c k)
  37 {
  38         struct bkey_s_c_xattr x = bkey_s_c_to_xattr(k);
  39
  40         return bch2_xattr_hash(info,
  41                  &X_SEARCH(x.v->x_type, x.v->x_name, x.v->x_name_len));
  42 }
  43
  44 static bool xattr_cmp_key(struct bkey_s_c _l, const void *_r)
  45 {
  46         struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
  47         const struct xattr_search_key *r = _r;
  48
  49         return l.v->x_type != r->type ||
  50                 l.v->x_name_len != r->name.len ||
  51                 memcmp(l.v->x_name, r->name.name, r->name.len);
  52 }
  53
  54 static bool xattr_cmp_bkey(struct bkey_s_c _l, struct bkey_s_c _r)
  55 {
  56         struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
  57         struct bkey_s_c_xattr r = bkey_s_c_to_xattr(_r);
  58
  59         return l.v->x_type != r.v->x_type ||
  60                 l.v->x_name_len != r.v->x_name_len ||
  61                 memcmp(l.v->x_name, r.v->x_name, r.v->x_name_len);
  62 }
  63
  64 const struct bch_hash_desc bch2_xattr_hash_desc = {
  65         .btree_id       = BTREE_ID_xattrs,
  66         .key_type       = KEY_TYPE_xattr,
  67         .hash_key       = xattr_hash_key,
  68         .hash_bkey      = xattr_hash_bkey,
  69         .cmp_key        = xattr_cmp_key,
  70         .cmp_bkey       = xattr_cmp_bkey,
  71 };
  72
  73 int bch2_xattr_invalid(struct bch_fs *c, struct bkey_s_c k,
  74                        enum bkey_invalid_flags flags,
  75                        struct printbuf *err)
  76 {
  77         struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
  78         unsigned val_u64s = xattr_val_u64s(xattr.v->x_name_len,
  79                                            le16_to_cpu(xattr.v->x_val_len));
  80         int ret = 0;
  81
  82         bkey_fsck_err_on(bkey_val_u64s(k.k) < val_u64s, c, err,
  83                          xattr_val_size_too_small,
  84                          "value too small (%zu < %u)",
  85                          bkey_val_u64s(k.k), val_u64s);
  86
  87         /* XXX why +4 ? */
  88         val_u64s = xattr_val_u64s(xattr.v->x_name_len,
  89                                   le16_to_cpu(xattr.v->x_val_len) + 4);
  90
  91         bkey_fsck_err_on(bkey_val_u64s(k.k) > val_u64s, c, err,
  92                          xattr_val_size_too_big,
  93                          "value too big (%zu > %u)",
  94                          bkey_val_u64s(k.k), val_u64s);
  95
  96         bkey_fsck_err_on(!bch2_xattr_type_to_handler(xattr.v->x_type), c, err,
  97                          xattr_invalid_type,
  98                          "invalid type (%u)", xattr.v->x_type);
  99
 100         bkey_fsck_err_on(memchr(xattr.v->x_name, '\0', xattr.v->x_name_len), c, err,
 101                          xattr_name_invalid_chars,
 102                          "xattr name has invalid characters");
 103 fsck_err:
 104         return ret;
 105 }
 106
 107 void bch2_xattr_to_text(struct printbuf *out, struct bch_fs *c,
 108                         struct bkey_s_c k)
 109 {
 110         const struct xattr_handler *handler;
 111         struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
 112
 113         handler = bch2_xattr_type_to_handler(xattr.v->x_type);
 114         if (handler && handler->prefix)
 115                 prt_printf(out, "%s", handler->prefix);
 116         else if (handler)
 117                 prt_printf(out, "(type %u)", xattr.v->x_type);
 118         else
 119                 prt_printf(out, "(unknown type %u)", xattr.v->x_type);
 120
 121         prt_printf(out, "%.*s:%.*s",
 122                xattr.v->x_name_len,
 123                xattr.v->x_name,
 124                le16_to_cpu(xattr.v->x_val_len),
 125                (char *) xattr_val(xattr.v));
 126
 127         if (xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS ||
 128             xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT) {
 129                 prt_char(out, ' ');
 130                 bch2_acl_to_text(out, xattr_val(xattr.v),
 131                                  le16_to_cpu(xattr.v->x_val_len));
 132         }
 133 }
 134
 135 static int bch2_xattr_get_trans(struct btree_trans *trans, struct bch_inode_info *inode,
 136                                 const char *name, void *buffer, size_t size, int type)
 137 {
 138         struct bch_hash_info hash = bch2_hash_info_init(trans->c, &inode->ei_inode);
 139         struct xattr_search_key search = X_SEARCH(type, name, strlen(name));
 140         struct btree_iter iter;
 141         struct bkey_s_c_xattr xattr;
 142         struct bkey_s_c k;
 143         int ret;
 144
 145         ret = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc, &hash,
 146                                inode_inum(inode), &search, 0);
 147         if (ret)
 148                 goto err1;
 149
 150         k = bch2_btree_iter_peek_slot(&iter);
 151         ret = bkey_err(k);
 152         if (ret)
 153                 goto err2;
 154
 155         xattr = bkey_s_c_to_xattr(k);
 156         ret = le16_to_cpu(xattr.v->x_val_len);
 157         if (buffer) {
 158                 if (ret > size)
 159                         ret = -ERANGE;
 160                 else
 161                         memcpy(buffer, xattr_val(xattr.v), ret);
 162         }
 163 err2:
 164         bch2_trans_iter_exit(trans, &iter);
 165 err1:
 166         return ret < 0 && bch2_err_matches(ret, ENOENT) ? -ENODATA : ret;
 167 }
 168
 169 int bch2_xattr_set(struct btree_trans *trans, subvol_inum inum,
 170                    struct bch_inode_unpacked *inode_u,
 171                    const struct bch_hash_info *hash_info,
 172                    const char *name, const void *value, size_t size,
 173                    int type, int flags)
 174 {
 175         struct bch_fs *c = trans->c;
 176         struct btree_iter inode_iter = { NULL };
 177         int ret;
 178
 179         ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_INTENT);
 180         if (ret)
 181                 return ret;
 182
 183         inode_u->bi_ctime = bch2_current_time(c);
 184
 185         ret = bch2_inode_write(trans, &inode_iter, inode_u);
 186         bch2_trans_iter_exit(trans, &inode_iter);
 187
 188         if (ret)
 189                 return ret;
 190
 191         if (value) {
 192                 struct bkey_i_xattr *xattr;
 193                 unsigned namelen = strlen(name);
 194                 unsigned u64s = BKEY_U64s +
 195                         xattr_val_u64s(namelen, size);
 196
 197                 if (u64s > U8_MAX)
 198                         return -ERANGE;
 199
 200                 xattr = bch2_trans_kmalloc(trans, u64s * sizeof(u64));
 201                 if (IS_ERR(xattr))
 202                         return PTR_ERR(xattr);
 203
 204                 bkey_xattr_init(&xattr->k_i);
 205                 xattr->k.u64s           = u64s;
 206                 xattr->v.x_type         = type;
 207                 xattr->v.x_name_len     = namelen;
 208                 xattr->v.x_val_len      = cpu_to_le16(size);
 209                 memcpy(xattr->v.x_name, name, namelen);
 210                 memcpy(xattr_val(&xattr->v), value, size);
 211
 212                 ret = bch2_hash_set(trans, bch2_xattr_hash_desc, hash_info,
 213                               inum, &xattr->k_i,
 214                               (flags & XATTR_CREATE ? BCH_HASH_SET_MUST_CREATE : 0)|
 215                               (flags & XATTR_REPLACE ? BCH_HASH_SET_MUST_REPLACE : 0));
 216         } else {
 217                 struct xattr_search_key search =
 218                         X_SEARCH(type, name, strlen(name));
 219
 220                 ret = bch2_hash_delete(trans, bch2_xattr_hash_desc,
 221                                        hash_info, inum, &search);
 222         }
 223
 224         if (bch2_err_matches(ret, ENOENT))
 225                 ret = flags & XATTR_REPLACE ? -ENODATA : 0;
 226
 227         return ret;
 228 }
 229
 230 struct xattr_buf {
 231         char            *buf;
 232         size_t          len;
 233         size_t          used;
 234 };
 235
 236 static int __bch2_xattr_emit(const char *prefix,
 237                              const char *name, size_t name_len,
 238                              struct xattr_buf *buf)
 239 {
 240         const size_t prefix_len = strlen(prefix);
 241         const size_t total_len = prefix_len + name_len + 1;
 242
 243         if (buf->buf) {
 244                 if (buf->used + total_len > buf->len)
 245                         return -ERANGE;
 246
 247                 memcpy(buf->buf + buf->used, prefix, prefix_len);
 248                 memcpy(buf->buf + buf->used + prefix_len,
 249                        name, name_len);
 250                 buf->buf[buf->used + prefix_len + name_len] = '\0';
 251         }
 252
 253         buf->used += total_len;
 254         return 0;
 255 }
 256
 257 static int bch2_xattr_emit(struct dentry *dentry,
 258                             const struct bch_xattr *xattr,
 259                             struct xattr_buf *buf)
 260 {
 261         const struct xattr_handler *handler =
 262                 bch2_xattr_type_to_handler(xattr->x_type);
 263
 264         return handler && (!handler->list || handler->list(dentry))
 265                 ? __bch2_xattr_emit(handler->prefix ?: handler->name,
 266                                     xattr->x_name, xattr->x_name_len, buf)
 267                 : 0;
 268 }
 269
 270 static int bch2_xattr_list_bcachefs(struct bch_fs *c,
 271                                     struct bch_inode_unpacked *inode,
 272                                     struct xattr_buf *buf,
 273                                     bool all)
 274 {
 275         const char *prefix = all ? "bcachefs_effective." : "bcachefs.";
 276         unsigned id;
 277         int ret = 0;
 278         u64 v;
 279
 280         for (id = 0; id < Inode_opt_nr; id++) {
 281                 v = bch2_inode_opt_get(inode, id);
 282                 if (!v)
 283                         continue;
 284
 285                 if (!all &&
 286                     !(inode->bi_fields_set & (1 << id)))
 287                         continue;
 288
 289                 ret = __bch2_xattr_emit(prefix, bch2_inode_opts[id],
 290                                         strlen(bch2_inode_opts[id]), buf);
 291                 if (ret)
 292                         break;
 293         }
 294
 295         return ret;
 296 }
 297
 298 ssize_t bch2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
 299 {
 300         struct bch_fs *c = dentry->d_sb->s_fs_info;
 301         struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
 302         struct btree_trans *trans = bch2_trans_get(c);
 303         struct btree_iter iter;
 304         struct bkey_s_c k;
 305         struct xattr_buf buf = { .buf = buffer, .len = buffer_size };
 306         u64 offset = 0, inum = inode->ei_inode.bi_inum;
 307         u32 snapshot;
 308         int ret;
 309 retry:
 310         bch2_trans_begin(trans);
 311         iter = (struct btree_iter) { NULL };
 312
 313         ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
 314         if (ret)
 315                 goto err;
 316
 317         for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_xattrs,
 318                            SPOS(inum, offset, snapshot),
 319                            POS(inum, U64_MAX), 0, k, ret) {
 320                 if (k.k->type != KEY_TYPE_xattr)
 321                         continue;
 322
 323                 ret = bch2_xattr_emit(dentry, bkey_s_c_to_xattr(k).v, &buf);
 324                 if (ret)
 325                         break;
 326         }
 327
 328         offset = iter.pos.offset;
 329         bch2_trans_iter_exit(trans, &iter);
 330 err:
 331         if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
 332                 goto retry;
 333
 334         bch2_trans_put(trans);
 335
 336         if (ret)
 337                 goto out;
 338
 339         ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, false);
 340         if (ret)
 341                 goto out;
 342
 343         ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, true);
 344         if (ret)
 345                 goto out;
 346
 347         return buf.used;
 348 out:
 349         return bch2_err_class(ret);
 350 }
 351
 352 static int bch2_xattr_get_handler(const struct xattr_handler *handler,
 353                                   struct dentry *dentry, struct inode *vinode,
 354                                   const char *name, void *buffer, size_t size)
 355 {
 356         struct bch_inode_info *inode = to_bch_ei(vinode);
 357         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 358         int ret = bch2_trans_do(c, NULL, NULL, 0,
 359                 bch2_xattr_get_trans(trans, inode, name, buffer, size, handler->flags));
 360
 361         return bch2_err_class(ret);
 362 }
 363
 364 static int bch2_xattr_set_handler(const struct xattr_handler *handler,
 365                                   struct mnt_idmap *idmap,
 366                                   struct dentry *dentry, struct inode *vinode,
 367                                   const char *name, const void *value,
 368                                   size_t size, int flags)
 369 {
 370         struct bch_inode_info *inode = to_bch_ei(vinode);
 371         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 372         struct bch_hash_info hash = bch2_hash_info_init(c, &inode->ei_inode);
 373         struct bch_inode_unpacked inode_u;
 374         int ret;
 375
 376         ret = bch2_trans_run(c,
 377                 commit_do(trans, NULL, NULL, 0,
 378                         bch2_xattr_set(trans, inode_inum(inode), &inode_u,
 379                                        &hash, name, value, size,
 380                                        handler->flags, flags)) ?:
 381                 (bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME), 0));
 382
 383         return bch2_err_class(ret);
 384 }
 385
 386 static const struct xattr_handler bch_xattr_user_handler = {
 387         .prefix = XATTR_USER_PREFIX,
 388         .get    = bch2_xattr_get_handler,
 389         .set    = bch2_xattr_set_handler,
 390         .flags  = KEY_TYPE_XATTR_INDEX_USER,
 391 };
 392
 393 static bool bch2_xattr_trusted_list(struct dentry *dentry)
 394 {
 395         return capable(CAP_SYS_ADMIN);
 396 }
 397
 398 static const struct xattr_handler bch_xattr_trusted_handler = {
 399         .prefix = XATTR_TRUSTED_PREFIX,
 400         .list   = bch2_xattr_trusted_list,
 401         .get    = bch2_xattr_get_handler,
 402         .set    = bch2_xattr_set_handler,
 403         .flags  = KEY_TYPE_XATTR_INDEX_TRUSTED,
 404 };
 405
 406 static const struct xattr_handler bch_xattr_security_handler = {
 407         .prefix = XATTR_SECURITY_PREFIX,
 408         .get    = bch2_xattr_get_handler,
 409         .set    = bch2_xattr_set_handler,
 410         .flags  = KEY_TYPE_XATTR_INDEX_SECURITY,
 411 };
 412
 413 #ifndef NO_BCACHEFS_FS
 414
 415 static int opt_to_inode_opt(int id)
 416 {
 417         switch (id) {
 418 #define x(name, ...)                            \
 419         case Opt_##name: return Inode_opt_##name;
 420         BCH_INODE_OPTS()
 421 #undef  x
 422         default:
 423                 return -1;
 424         }
 425 }
 426
 427 static int __bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
 428                                 struct dentry *dentry, struct inode *vinode,
 429                                 const char *name, void *buffer, size_t size,
 430                                 bool all)
 431 {
 432         struct bch_inode_info *inode = to_bch_ei(vinode);
 433         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 434         struct bch_opts opts =
 435                 bch2_inode_opts_to_opts(&inode->ei_inode);
 436         const struct bch_option *opt;
 437         int id, inode_opt_id;
 438         struct printbuf out = PRINTBUF;
 439         int ret;
 440         u64 v;
 441
 442         id = bch2_opt_lookup(name);
 443         if (id < 0 || !bch2_opt_is_inode_opt(id))
 444                 return -EINVAL;
 445
 446         inode_opt_id = opt_to_inode_opt(id);
 447         if (inode_opt_id < 0)
 448                 return -EINVAL;
 449
 450         opt = bch2_opt_table + id;
 451
 452         if (!bch2_opt_defined_by_id(&opts, id))
 453                 return -ENODATA;
 454
 455         if (!all &&
 456             !(inode->ei_inode.bi_fields_set & (1 << inode_opt_id)))
 457                 return -ENODATA;
 458
 459         v = bch2_opt_get_by_id(&opts, id);
 460         bch2_opt_to_text(&out, c, c->disk_sb.sb, opt, v, 0);
 461
 462         ret = out.pos;
 463
 464         if (out.allocation_failure) {
 465                 ret = -ENOMEM;
 466         } else if (buffer) {
 467                 if (out.pos > size)
 468                         ret = -ERANGE;
 469                 else
 470                         memcpy(buffer, out.buf, out.pos);
 471         }
 472
 473         printbuf_exit(&out);
 474         return ret;
 475 }
 476
 477 static int bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
 478                                    struct dentry *dentry, struct inode *vinode,
 479                                    const char *name, void *buffer, size_t size)
 480 {
 481         return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
 482                                          name, buffer, size, false);
 483 }
 484
 485 struct inode_opt_set {
 486         int                     id;
 487         u64                     v;
 488         bool                    defined;
 489 };
 490
 491 static int inode_opt_set_fn(struct btree_trans *trans,
 492                             struct bch_inode_info *inode,
 493                             struct bch_inode_unpacked *bi,
 494                             void *p)
 495 {
 496         struct inode_opt_set *s = p;
 497
 498         if (s->defined)
 499                 bi->bi_fields_set |= 1U << s->id;
 500         else
 501                 bi->bi_fields_set &= ~(1U << s->id);
 502
 503         bch2_inode_opt_set(bi, s->id, s->v);
 504
 505         return 0;
 506 }
 507
 508 static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
 509                                    struct mnt_idmap *idmap,
 510                                    struct dentry *dentry, struct inode *vinode,
 511                                    const char *name, const void *value,
 512                                    size_t size, int flags)
 513 {
 514         struct bch_inode_info *inode = to_bch_ei(vinode);
 515         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 516         const struct bch_option *opt;
 517         char *buf;
 518         struct inode_opt_set s;
 519         int opt_id, inode_opt_id, ret;
 520
 521         opt_id = bch2_opt_lookup(name);
 522         if (opt_id < 0)
 523                 return -EINVAL;
 524
 525         opt = bch2_opt_table + opt_id;
 526
 527         inode_opt_id = opt_to_inode_opt(opt_id);
 528         if (inode_opt_id < 0)
 529                 return -EINVAL;
 530
 531         s.id = inode_opt_id;
 532
 533         if (value) {
 534                 u64 v = 0;
 535
 536                 buf = kmalloc(size + 1, GFP_KERNEL);
 537                 if (!buf)
 538                         return -ENOMEM;
 539                 memcpy(buf, value, size);
 540                 buf[size] = '\0';
 541
 542                 ret = bch2_opt_parse(c, opt, buf, &v, NULL);
 543                 kfree(buf);
 544
 545                 if (ret < 0)
 546                         return ret;
 547
 548                 ret = bch2_opt_check_may_set(c, opt_id, v);
 549                 if (ret < 0)
 550                         return ret;
 551
 552                 s.v = v + 1;
 553                 s.defined = true;
 554         } else {
 555                 if (!IS_ROOT(dentry)) {
 556                         struct bch_inode_info *dir =
 557                                 to_bch_ei(d_inode(dentry->d_parent));
 558
 559                         s.v = bch2_inode_opt_get(&dir->ei_inode, inode_opt_id);
 560                 } else {
 561                         s.v = 0;
 562                 }
 563
 564                 s.defined = false;
 565         }
 566
 567         mutex_lock(&inode->ei_update_lock);
 568         if (inode_opt_id == Inode_opt_project) {
 569                 /*
 570                  * inode fields accessible via the xattr interface are stored
 571                  * with a +1 bias, so that 0 means unset:
 572                  */
 573                 ret = bch2_set_projid(c, inode, s.v ? s.v - 1 : 0);
 574                 if (ret)
 575                         goto err;
 576         }
 577
 578         ret = bch2_write_inode(c, inode, inode_opt_set_fn, &s, 0);
 579 err:
 580         mutex_unlock(&inode->ei_update_lock);
 581
 582         if (value &&
 583             (opt_id == Opt_background_compression ||
 584              opt_id == Opt_background_target))
 585                 bch2_set_rebalance_needs_scan(c, inode->ei_inode.bi_inum);
 586
 587         return bch2_err_class(ret);
 588 }
 589
 590 static const struct xattr_handler bch_xattr_bcachefs_handler = {
 591         .prefix = "bcachefs.",
 592         .get    = bch2_xattr_bcachefs_get,
 593         .set    = bch2_xattr_bcachefs_set,
 594 };
 595
 596 static int bch2_xattr_bcachefs_get_effective(
 597                                 const struct xattr_handler *handler,
 598                                 struct dentry *dentry, struct inode *vinode,
 599                                 const char *name, void *buffer, size_t size)
 600 {
 601         return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
 602                                          name, buffer, size, true);
 603 }
 604
 605 static const struct xattr_handler bch_xattr_bcachefs_effective_handler = {
 606         .prefix = "bcachefs_effective.",
 607         .get    = bch2_xattr_bcachefs_get_effective,
 608         .set    = bch2_xattr_bcachefs_set,
 609 };
 610
 611 #endif /* NO_BCACHEFS_FS */
 612
 613 const struct xattr_handler *bch2_xattr_handlers[] = {
 614         &bch_xattr_user_handler,
 615 #ifdef CONFIG_BCACHEFS_POSIX_ACL
 616         &nop_posix_acl_access,
 617         &nop_posix_acl_default,
 618 #endif
 619         &bch_xattr_trusted_handler,
 620         &bch_xattr_security_handler,
 621 #ifndef NO_BCACHEFS_FS
 622         &bch_xattr_bcachefs_handler,
 623         &bch_xattr_bcachefs_effective_handler,
 624 #endif
 625         NULL
 626 };
 627
 628 static const struct xattr_handler *bch_xattr_handler_map[] = {
 629         [KEY_TYPE_XATTR_INDEX_USER]                     = &bch_xattr_user_handler,
 630         [KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS] =
 631                 &nop_posix_acl_access,
 632         [KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT]        =
 633                 &nop_posix_acl_default,
 634         [KEY_TYPE_XATTR_INDEX_TRUSTED]          = &bch_xattr_trusted_handler,
 635         [KEY_TYPE_XATTR_INDEX_SECURITY]         = &bch_xattr_security_handler,
 636 };
 637
 638 static const struct xattr_handler *bch2_xattr_type_to_handler(unsigned type)
 639 {
 640         return type < ARRAY_SIZE(bch_xattr_handler_map)
 641                 ? bch_xattr_handler_map[type]
 642                 : NULL;
 643 }