lustre/ptlrpc/nodemap_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (C) 2013, Trustees of Indiana University
  24  *
  25  * Copyright (c) 2014, Intel Corporation.
  26  *
  27  * Author: Joshua Walgenbach <jjw@iu.edu>
  28  */
  29 #include <linux/module.h>
  30 #include <linux/sort.h>
  31 #include <lnet/nidstr.h>
  32 #include <lustre_net.h>
  33 #include <lustre_acl.h>
  34 #include <lustre_eacl.h>
  35 #include <obd_class.h>
  36 #include "nodemap_internal.h"
  37
  38 #define HASH_NODEMAP_BKT_BITS 3
  39 #define HASH_NODEMAP_CUR_BITS 3
  40 #define HASH_NODEMAP_MAX_BITS 7
  41
  42 #define DEFAULT_NODEMAP "default"
  43
  44 /* nodemap proc root proc directory under fs/lustre */
  45 struct proc_dir_entry *proc_lustre_nodemap_root;
  46
  47 /* Copy of config active flag to avoid locking in mapping functions */
  48 bool nodemap_active;
  49
  50 /* Lock protecting the active config, useful primarily when proc and
  51  * nodemap_hash might be replaced when loading a new config
  52  * Any time the active config is referenced, the lock should be held.
  53  */
  54 DEFINE_MUTEX(active_config_lock);
  55 struct nodemap_config *active_config;
  56
  57 /**
  58  * Nodemap destructor
  59  *
  60  * \param       nodemap         nodemap to destroy
  61  */
  62 static void nodemap_destroy(struct lu_nodemap *nodemap)
  63 {
  64         ENTRY;
  65
  66         if (nodemap->nm_pde_data != NULL)
  67                 lprocfs_nodemap_remove(nodemap->nm_pde_data);
  68
  69         mutex_lock(&active_config_lock);
  70         down_read(&active_config->nmc_range_tree_lock);
  71         nm_member_reclassify_nodemap(nodemap);
  72         up_read(&active_config->nmc_range_tree_lock);
  73         mutex_unlock(&active_config_lock);
  74
  75         if (!list_empty(&nodemap->nm_member_list))
  76                 CWARN("nodemap_destroy failed to reclassify all members\n");
  77
  78         write_lock(&nodemap->nm_idmap_lock);
  79         idmap_delete_tree(nodemap);
  80         write_unlock(&nodemap->nm_idmap_lock);
  81
  82         nm_member_delete_list(nodemap);
  83
  84         OBD_FREE_PTR(nodemap);
  85
  86         EXIT;
  87 }
  88
  89 /**
  90  * Functions used for the cfs_hash
  91  */
  92 static void nodemap_getref(struct lu_nodemap *nodemap)
  93 {
  94         atomic_inc(&nodemap->nm_refcount);
  95 }
  96
  97 /**
  98  * Destroy nodemap if last reference is put. Should be called outside
  99  * active_config_lock
 100  */
 101 void nodemap_putref(struct lu_nodemap *nodemap)
 102 {
 103         LASSERT(nodemap != NULL);
 104         LASSERT(atomic_read(&nodemap->nm_refcount) > 0);
 105
 106         if (atomic_dec_and_test(&nodemap->nm_refcount))
 107                 nodemap_destroy(nodemap);
 108 }
 109
 110 static __u32 nodemap_hashfn(struct cfs_hash *hash_body,
 111                             const void *key, unsigned mask)
 112 {
 113         return cfs_hash_djb2_hash(key, strlen(key), mask);
 114 }
 115
 116 static void *nodemap_hs_key(struct hlist_node *hnode)
 117 {
 118         struct lu_nodemap *nodemap;
 119
 120         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 121
 122         return nodemap->nm_name;
 123 }
 124
 125 static int nodemap_hs_keycmp(const void *key,
 126                              struct hlist_node *compared_hnode)
 127 {
 128         char *nodemap_name;
 129
 130         nodemap_name = nodemap_hs_key(compared_hnode);
 131
 132         return !strcmp(key, nodemap_name);
 133 }
 134
 135 static void *nodemap_hs_hashobject(struct hlist_node *hnode)
 136 {
 137         return hlist_entry(hnode, struct lu_nodemap, nm_hash);
 138 }
 139
 140 static void nodemap_hs_get(struct cfs_hash *hs, struct hlist_node *hnode)
 141 {
 142         struct lu_nodemap *nodemap;
 143
 144         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 145         nodemap_getref(nodemap);
 146 }
 147
 148 static void nodemap_hs_put_locked(struct cfs_hash *hs,
 149                                   struct hlist_node *hnode)
 150 {
 151         struct lu_nodemap *nodemap;
 152
 153         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 154         nodemap_putref(nodemap);
 155 }
 156
 157 static struct cfs_hash_ops nodemap_hash_operations = {
 158         .hs_hash        = nodemap_hashfn,
 159         .hs_key         = nodemap_hs_key,
 160         .hs_keycmp      = nodemap_hs_keycmp,
 161         .hs_object      = nodemap_hs_hashobject,
 162         .hs_get         = nodemap_hs_get,
 163         .hs_put_locked  = nodemap_hs_put_locked,
 164 };
 165
 166 /* end of cfs_hash functions */
 167
 168 /**
 169  * Initialize nodemap_hash
 170  *
 171  * \retval      0               success
 172  * \retval      -ENOMEM         cannot create hash
 173  */
 174 static int nodemap_init_hash(struct nodemap_config *nmc)
 175 {
 176         nmc->nmc_nodemap_hash = cfs_hash_create("NODEMAP",
 177                                                 HASH_NODEMAP_CUR_BITS,
 178                                                 HASH_NODEMAP_MAX_BITS,
 179                                                 HASH_NODEMAP_BKT_BITS, 0,
 180                                                 CFS_HASH_MIN_THETA,
 181                                                 CFS_HASH_MAX_THETA,
 182                                                 &nodemap_hash_operations,
 183                                                 CFS_HASH_DEFAULT);
 184
 185         if (nmc->nmc_nodemap_hash == NULL) {
 186                 CERROR("cannot create nodemap_hash table\n");
 187                 return -ENOMEM;
 188         }
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * Check for valid nodemap name
 195  *
 196  * \param       name            nodemap name
 197  * \retval      true            valid
 198  * \retval      false           invalid
 199  */
 200 static bool nodemap_name_is_valid(const char *name)
 201 {
 202         if (strlen(name) > LUSTRE_NODEMAP_NAME_LENGTH ||
 203             strlen(name) == 0)
 204                 return false;
 205
 206         for (; *name != '\0'; name++) {
 207                 if (!isalnum(*name) && *name != '_')
 208                         return false;
 209         }
 210
 211         return true;
 212 }
 213
 214 /**
 215  * Nodemap lookup
 216  *
 217  * Look nodemap up in the active_config nodemap hash. Caller should hold the
 218  * active_config_lock.
 219  *
 220  * \param       name            name of nodemap
 221  * \retval      nodemap         pointer set to found nodemap
 222  * \retval      -EINVAL         name is not valid
 223  * \retval      -ENOENT         nodemap not found
 224  */
 225 struct lu_nodemap *nodemap_lookup(const char *name)
 226 {
 227         struct lu_nodemap *nodemap = NULL;
 228
 229         if (!nodemap_name_is_valid(name))
 230                 return ERR_PTR(-EINVAL);
 231
 232         nodemap = cfs_hash_lookup(active_config->nmc_nodemap_hash, name);
 233         if (nodemap == NULL)
 234                 return ERR_PTR(-ENOENT);
 235
 236         return nodemap;
 237 }
 238
 239 /**
 240  * Classify the nid into the proper nodemap. Caller must hold active config and
 241  * nm_range_tree_lock, and call nodemap_putref when done with nodemap.
 242  *
 243  * \param       nid                     nid to classify
 244  * \retval      nodemap                 nodemap containing the nid
 245  * \retval      default_nodemap         default nodemap
 246  */
 247 struct lu_nodemap *nodemap_classify_nid(lnet_nid_t nid)
 248 {
 249         struct lu_nid_range     *range;
 250         struct lu_nodemap       *nodemap;
 251
 252         range = range_search(&active_config->nmc_range_tree, nid);
 253         if (range != NULL)
 254                 nodemap = range->rn_nodemap;
 255         else
 256                 nodemap = active_config->nmc_default_nodemap;
 257
 258         nodemap_getref(nodemap);
 259
 260         return nodemap;
 261 }
 262
 263 /**
 264  * simple check for default nodemap
 265  */
 266 static bool is_default_nodemap(const struct lu_nodemap *nodemap)
 267 {
 268         return nodemap->nm_id == 0;
 269 }
 270
 271 /**
 272  * parse a nodemap range string into two nids
 273  *
 274  * \param       range_str               string to parse
 275  * \param       range[2]                array of two nids
 276  * \reyval      0 on success
 277  */
 278 int nodemap_parse_range(const char *range_str, lnet_nid_t range[2])
 279 {
 280         char    buf[LNET_NIDSTR_SIZE * 2 + 2];
 281         char    *ptr = NULL;
 282         char    *start_nidstr;
 283         char    *end_nidstr;
 284         int     rc = 0;
 285
 286         snprintf(buf, sizeof(buf), "%s", range_str);
 287         ptr = buf;
 288         start_nidstr = strsep(&ptr, ":");
 289         end_nidstr = strsep(&ptr, ":");
 290
 291         if (start_nidstr == NULL || end_nidstr == NULL)
 292                 GOTO(out, rc = -EINVAL);
 293
 294         range[0] = libcfs_str2nid(start_nidstr);
 295         range[1] = libcfs_str2nid(end_nidstr);
 296
 297 out:
 298         return rc;
 299
 300 }
 301 EXPORT_SYMBOL(nodemap_parse_range);
 302
 303 /**
 304  * parse a string containing an id map of form "client_id:filesystem_id"
 305  * into an array of __u32 * for use in mapping functions
 306  *
 307  * \param       idmap_str               map string
 308  * \param       idmap                   array[2] of __u32
 309  *
 310  * \retval      0 on success
 311  * \retval      -EINVAL if idmap cannot be parsed
 312  */
 313 int nodemap_parse_idmap(char *idmap_str, __u32 idmap[2])
 314 {
 315         char                    *sep;
 316         long unsigned int        idmap_buf;
 317         int                      rc;
 318
 319         if (idmap_str == NULL)
 320                 return -EINVAL;
 321
 322         sep = strchr(idmap_str, ':');
 323         if (sep == NULL)
 324                 return -EINVAL;
 325         *sep = '\0';
 326         sep++;
 327
 328         rc = kstrtoul(idmap_str, 10, &idmap_buf);
 329         if (rc != 0)
 330                 return -EINVAL;
 331         idmap[0] = idmap_buf;
 332
 333         rc = kstrtoul(sep, 10, &idmap_buf);
 334         if (rc != 0)
 335                 return -EINVAL;
 336         idmap[1] = idmap_buf;
 337
 338         return 0;
 339 }
 340 EXPORT_SYMBOL(nodemap_parse_idmap);
 341
 342 /**
 343  * add a member to a nodemap
 344  *
 345  * \param       nid             nid to add to the members
 346  * \param       exp             obd_export structure for the connection
 347  *                              that is being added
 348  * \retval      -EINVAL         export is NULL
 349  * \retval      -EEXIST         export is already member of a nodemap
 350  */
 351 int nodemap_add_member(lnet_nid_t nid, struct obd_export *exp)
 352 {
 353         struct lu_nodemap       *nodemap;
 354         int rc;
 355
 356         mutex_lock(&active_config_lock);
 357         down_read(&active_config->nmc_range_tree_lock);
 358
 359         nodemap = nodemap_classify_nid(nid);
 360         rc = nm_member_add(nodemap, exp);
 361
 362         up_read(&active_config->nmc_range_tree_lock);
 363         mutex_unlock(&active_config_lock);
 364
 365         nodemap_putref(nodemap);
 366
 367         return rc;
 368 }
 369 EXPORT_SYMBOL(nodemap_add_member);
 370
 371 /**
 372  * delete a member from a nodemap
 373  *
 374  * \param       exp             export to remove from a nodemap
 375  */
 376 void nodemap_del_member(struct obd_export *exp)
 377 {
 378         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 379
 380         if (nodemap != NULL)
 381                 nm_member_del(nodemap, exp);
 382 }
 383 EXPORT_SYMBOL(nodemap_del_member);
 384
 385 /**
 386  * add an idmap to the proper nodemap trees
 387  *
 388  * \param       name            name of nodemap
 389  * \param       id_type         NODEMAP_UID or NODEMAP_GID
 390  * \param       map             array[2] __u32 containing the map values
 391  *                              map[0] is client id
 392  *                              map[1] is the filesystem id
 393  *
 394  * \retval      0 on success
 395  */
 396 int nodemap_add_idmap_helper(struct lu_nodemap *nodemap,
 397                              enum nodemap_id_type id_type,
 398                              const __u32 map[2])
 399 {
 400         struct lu_idmap         *idmap;
 401         int                     rc = 0;
 402
 403         idmap = idmap_create(map[0], map[1]);
 404         if (idmap == NULL)
 405                 GOTO(out, rc = -ENOMEM);
 406
 407         write_lock(&nodemap->nm_idmap_lock);
 408         idmap_insert(id_type, idmap, nodemap);
 409         write_unlock(&nodemap->nm_idmap_lock);
 410         nm_member_revoke_locks(nodemap);
 411
 412 out:
 413         return rc;
 414 }
 415
 416 int nodemap_add_idmap(const char *name, enum nodemap_id_type id_type,
 417                       const __u32 map[2])
 418 {
 419         struct lu_nodemap       *nodemap = NULL;
 420         int                      rc;
 421
 422         mutex_lock(&active_config_lock);
 423         nodemap = nodemap_lookup(name);
 424         if (IS_ERR(nodemap)) {
 425                 mutex_unlock(&active_config_lock);
 426                 GOTO(out, rc = PTR_ERR(nodemap));
 427         }
 428
 429         if (is_default_nodemap(nodemap)) {
 430                 rc = -EINVAL;
 431         } else {
 432                 rc = nodemap_add_idmap_helper(nodemap, id_type, map);
 433                 if (rc == 0)
 434                         rc = nodemap_idx_idmap_add(nodemap, id_type, map);
 435         }
 436         mutex_unlock(&active_config_lock);
 437         nodemap_putref(nodemap);
 438
 439 out:
 440         return rc;
 441 }
 442 EXPORT_SYMBOL(nodemap_add_idmap);
 443
 444 /**
 445  * delete idmap from proper nodemap tree
 446  *
 447  * \param       name            name of nodemap
 448  * \param       id_type         NODEMAP_UID or NODEMAP_GID
 449  * \param       map             array[2] __u32 containing the mapA values
 450  *                              map[0] is client id
 451  *                              map[1] is the filesystem id
 452  *
 453  * \retval      0 on success
 454  */
 455 int nodemap_del_idmap(const char *name, enum nodemap_id_type id_type,
 456                       const __u32 map[2])
 457 {
 458         struct lu_nodemap       *nodemap = NULL;
 459         struct lu_idmap         *idmap = NULL;
 460         int                     rc = 0;
 461
 462         mutex_lock(&active_config_lock);
 463         nodemap = nodemap_lookup(name);
 464         if (IS_ERR(nodemap)) {
 465                 mutex_unlock(&active_config_lock);
 466                 GOTO(out, rc = PTR_ERR(nodemap));
 467         }
 468
 469         if (is_default_nodemap(nodemap))
 470                 GOTO(out_putref, rc = -EINVAL);
 471
 472         write_lock(&nodemap->nm_idmap_lock);
 473         idmap = idmap_search(nodemap, NODEMAP_CLIENT_TO_FS, id_type,
 474                              map[0]);
 475         if (idmap == NULL) {
 476                 rc = -EINVAL;
 477         } else {
 478                 idmap_delete(id_type, idmap, nodemap);
 479                 rc = nodemap_idx_idmap_del(nodemap, id_type, map);
 480         }
 481         write_unlock(&nodemap->nm_idmap_lock);
 482
 483 out_putref:
 484         mutex_unlock(&active_config_lock);
 485         if (rc == 0)
 486                 nm_member_revoke_locks(nodemap);
 487         nodemap_putref(nodemap);
 488
 489 out:
 490         return rc;
 491 }
 492 EXPORT_SYMBOL(nodemap_del_idmap);
 493
 494 /**
 495  * mapping function for nodemap idmaps
 496  *
 497  * \param       nodemap         lu_nodemap structure defining nodemap
 498  * \param       node_type       NODEMAP_UID or NODEMAP_GID
 499  * \param       tree_type       NODEMAP_CLIENT_TO_FS or
 500  *                              NODEMAP_FS_TO_CLIENT
 501  * \param       id              id to map
 502  *
 503  * \retval      mapped id according to the rules below.
 504  *
 505  * if the nodemap_active is false, just return the passed id without mapping
 506  *
 507  * if the id to be looked up is 0, check that root access is allowed and if it
 508  * is, return 0. Otherwise, return the squash uid or gid.
 509  *
 510  * if the nodemap is configured to trusted the ids from the client system, just
 511  * return the passwd id without mapping.
 512  *
 513  * if by this point, we haven't returned and the nodemap in question is the
 514  * default nodemap, return the squash uid or gid.
 515  *
 516  * after these checks, search the proper tree for the mapping, and if found
 517  * return the mapped value, otherwise return the squash uid or gid.
 518  */
 519 __u32 nodemap_map_id(struct lu_nodemap *nodemap,
 520                      enum nodemap_id_type id_type,
 521                      enum nodemap_tree_type tree_type, __u32 id)
 522 {
 523         struct lu_idmap         *idmap = NULL;
 524         __u32                    found_id;
 525
 526         if (!nodemap_active)
 527                 goto out;
 528
 529         if (unlikely(nodemap == NULL))
 530                 goto out;
 531
 532         if (id == 0) {
 533                 if (nodemap->nmf_allow_root_access)
 534                         goto out;
 535                 else
 536                         goto squash;
 537         }
 538
 539         if (nodemap->nmf_trust_client_ids)
 540                 goto out;
 541
 542         if (is_default_nodemap(nodemap))
 543                 goto squash;
 544
 545         read_lock(&nodemap->nm_idmap_lock);
 546         idmap = idmap_search(nodemap, tree_type, id_type, id);
 547         if (idmap == NULL) {
 548                 read_unlock(&nodemap->nm_idmap_lock);
 549                 goto squash;
 550         }
 551
 552         if (tree_type == NODEMAP_FS_TO_CLIENT)
 553                 found_id = idmap->id_client;
 554         else
 555                 found_id = idmap->id_fs;
 556         read_unlock(&nodemap->nm_idmap_lock);
 557         return found_id;
 558
 559 squash:
 560         if (id_type == NODEMAP_UID)
 561                 return nodemap->nm_squash_uid;
 562         else
 563                 return nodemap->nm_squash_gid;
 564 out:
 565         return id;
 566 }
 567 EXPORT_SYMBOL(nodemap_map_id);
 568
 569 /**
 570  * Map posix ACL entries according to the nodemap membership. Removes any
 571  * squashed ACLs.
 572  *
 573  * \param       lu_nodemap      nodemap
 574  * \param       buf             buffer containing xattr encoded ACLs
 575  * \param       size            size of ACLs in bytes
 576  * \param       tree_type       direction of mapping
 577  * \retval      size            new size of ACLs in bytes
 578  * \retval      -EINVAL         bad \a size param, see posix_acl_xattr_count()
 579  */
 580 ssize_t nodemap_map_acl(struct lu_nodemap *nodemap, void *buf, size_t size,
 581                         enum nodemap_tree_type tree_type)
 582 {
 583         posix_acl_xattr_header  *header = buf;
 584         posix_acl_xattr_entry   *entry = &header->a_entries[0];
 585         posix_acl_xattr_entry   *new_entry = entry;
 586         posix_acl_xattr_entry   *end;
 587         int                      count;
 588
 589         if (!nodemap_active)
 590                 return size;
 591
 592         if (unlikely(nodemap == NULL))
 593                 return size;
 594
 595         count = posix_acl_xattr_count(size);
 596         if (count < 0)
 597                 return -EINVAL;
 598         if (count == 0)
 599                 return 0;
 600
 601         for (end = entry + count; entry != end; entry++) {
 602                 __u16 tag = le16_to_cpu(entry->e_tag);
 603                 __u32 id = le32_to_cpu(entry->e_id);
 604
 605                 switch (tag) {
 606                 case ACL_USER:
 607                         id = nodemap_map_id(nodemap, NODEMAP_UID,
 608                                             tree_type, id);
 609                         if (id == nodemap->nm_squash_uid)
 610                                 continue;
 611                         entry->e_id = cpu_to_le32(id);
 612                         break;
 613                 case ACL_GROUP:
 614                         id = nodemap_map_id(nodemap, NODEMAP_GID,
 615                                             tree_type, id);
 616                         if (id == nodemap->nm_squash_gid)
 617                                 continue;
 618                         entry->e_id = cpu_to_le32(id);
 619                         break;
 620                 }
 621
 622                 /* if we skip an ACL, copy the following ones over it */
 623                 if (new_entry != entry)
 624                         *new_entry = *entry;
 625
 626                 new_entry++;
 627         }
 628
 629         return (void *)new_entry - (void *)header;
 630 }
 631 EXPORT_SYMBOL(nodemap_map_acl);
 632
 633 /*
 634  * Add nid range to given nodemap
 635  *
 636  * \param       config          nodemap config to work on
 637  * \param       nodemap         nodemap to add range to
 638  * \param       nid             nid range to add
 639  * \param       range_id        should be 0 unless loading from disk
 640  * \retval      0               success
 641  * \retval      -ENOMEM
 642  *
 643  */
 644 int nodemap_add_range_helper(struct nodemap_config *config,
 645                              struct lu_nodemap *nodemap,
 646                              const lnet_nid_t nid[2],
 647                              unsigned int range_id)
 648 {
 649         struct lu_nid_range     *range;
 650         int rc;
 651
 652         down_write(&config->nmc_range_tree_lock);
 653         range = range_create(&config->nmc_range_tree, nid[0], nid[1],
 654                              nodemap, range_id);
 655         if (range == NULL) {
 656                 up_write(&config->nmc_range_tree_lock);
 657                 GOTO(out, rc = -ENOMEM);
 658         }
 659
 660         rc = range_insert(&config->nmc_range_tree, range);
 661         if (rc != 0) {
 662                 CERROR("cannot insert nodemap range into '%s': rc = %d\n",
 663                       nodemap->nm_name, rc);
 664                 up_write(&config->nmc_range_tree_lock);
 665                 list_del(&range->rn_list);
 666                 range_destroy(range);
 667                 GOTO(out, rc = -ENOMEM);
 668         }
 669
 670         list_add(&range->rn_list, &nodemap->nm_ranges);
 671         nm_member_reclassify_nodemap(config->nmc_default_nodemap);
 672         up_write(&config->nmc_range_tree_lock);
 673
 674         /* if range_id is non-zero, we are loading from disk */
 675         if (range_id == 0)
 676                 rc = nodemap_idx_range_add(range, nid);
 677
 678         nm_member_revoke_locks(config->nmc_default_nodemap);
 679         nm_member_revoke_locks(nodemap);
 680
 681 out:
 682         return rc;
 683 }
 684 int nodemap_add_range(const char *name, const lnet_nid_t nid[2])
 685 {
 686         struct lu_nodemap       *nodemap = NULL;
 687         int                      rc;
 688
 689         mutex_lock(&active_config_lock);
 690         nodemap = nodemap_lookup(name);
 691         if (IS_ERR(nodemap)) {
 692                 mutex_unlock(&active_config_lock);
 693                 GOTO(out, rc = PTR_ERR(nodemap));
 694         }
 695
 696         if (is_default_nodemap(nodemap))
 697                 rc = -EINVAL;
 698         else
 699                 rc = nodemap_add_range_helper(active_config, nodemap, nid, 0);
 700         mutex_unlock(&active_config_lock);
 701         nodemap_putref(nodemap);
 702 out:
 703         return rc;
 704 }
 705 EXPORT_SYMBOL(nodemap_add_range);
 706
 707 /**
 708  * delete a range
 709  * \param       name            nodemap name
 710  * \param       range_str       string containing range
 711  * \retval      0 on success
 712  *
 713  * Delete range from global range tree, and remove it
 714  * from the list in the associated nodemap.
 715  */
 716 int nodemap_del_range(const char *name, const lnet_nid_t nid[2])
 717 {
 718         struct lu_nodemap       *nodemap;
 719         struct lu_nid_range     *range;
 720         int                     rc = 0;
 721
 722         mutex_lock(&active_config_lock);
 723         nodemap = nodemap_lookup(name);
 724         if (IS_ERR(nodemap)) {
 725                 mutex_unlock(&active_config_lock);
 726                 GOTO(out, rc = PTR_ERR(nodemap));
 727         }
 728
 729         if (is_default_nodemap(nodemap))
 730                 GOTO(out_putref, rc = -EINVAL);
 731
 732         down_write(&active_config->nmc_range_tree_lock);
 733         range = range_find(&active_config->nmc_range_tree, nid[0], nid[1]);
 734         if (range == NULL) {
 735                 up_write(&active_config->nmc_range_tree_lock);
 736                 GOTO(out_putref, rc = -EINVAL);
 737         }
 738         rc = nodemap_idx_range_del(range);
 739         range_delete(&active_config->nmc_range_tree, range);
 740         nm_member_reclassify_nodemap(nodemap);
 741         up_write(&active_config->nmc_range_tree_lock);
 742
 743         nm_member_revoke_locks(active_config->nmc_default_nodemap);
 744         nm_member_revoke_locks(nodemap);
 745
 746 out_putref:
 747         mutex_unlock(&active_config_lock);
 748         nodemap_putref(nodemap);
 749 out:
 750         return rc;
 751 }
 752 EXPORT_SYMBOL(nodemap_del_range);
 753
 754 /**
 755  * Nodemap constructor
 756  *
 757  * Creates an lu_nodemap structure and assigns sane default
 758  * member values. If this is the default nodemap, the defaults
 759  * are the most restictive in xterms of mapping behavior. Otherwise
 760  * the default flags should be inherited from the default nodemap.
 761  * The adds nodemap to nodemap_hash.
 762  *
 763  * Requires that the caller take the active_config_lock
 764  *
 765  * \param       name            name of nodemap
 766  * \param       is_default      true if default nodemap
 767  * \retval      nodemap         success
 768  * \retval      -EINVAL         invalid nodemap name
 769  * \retval      -EEXIST         nodemap already exists
 770  * \retval      -ENOMEM         cannot allocate memory for nodemap
 771  */
 772 struct lu_nodemap *nodemap_create(const char *name,
 773                                   struct nodemap_config *config,
 774                                   bool is_default)
 775 {
 776         struct lu_nodemap       *nodemap = NULL;
 777         struct lu_nodemap       *default_nodemap;
 778         struct cfs_hash         *hash = config->nmc_nodemap_hash;
 779         int                      rc = 0;
 780
 781         default_nodemap = config->nmc_default_nodemap;
 782
 783         if (!nodemap_name_is_valid(name))
 784                 GOTO(out, rc = -EINVAL);
 785
 786         if (hash == NULL) {
 787                 CERROR("Config nodemap hash is NULL, unable to add %s\n", name);
 788                 GOTO(out, rc = -EINVAL);
 789         }
 790
 791         OBD_ALLOC_PTR(nodemap);
 792         if (nodemap == NULL) {
 793                 CERROR("cannot allocate memory (%zu bytes)"
 794                        "for nodemap '%s'\n", sizeof(*nodemap),
 795                        name);
 796                 GOTO(out, rc = -ENOMEM);
 797         }
 798
 799         /*
 800          * take an extra reference to prevent nodemap from being destroyed
 801          * while it's being created.
 802          */
 803         atomic_set(&nodemap->nm_refcount, 2);
 804         snprintf(nodemap->nm_name, sizeof(nodemap->nm_name), "%s", name);
 805         rc = cfs_hash_add_unique(hash, name, &nodemap->nm_hash);
 806         if (rc != 0) {
 807                 OBD_FREE_PTR(nodemap);
 808                 GOTO(out, rc = -EEXIST);
 809         }
 810
 811         INIT_LIST_HEAD(&nodemap->nm_ranges);
 812         INIT_LIST_HEAD(&nodemap->nm_list);
 813         INIT_LIST_HEAD(&nodemap->nm_member_list);
 814
 815         mutex_init(&nodemap->nm_member_list_lock);
 816         rwlock_init(&nodemap->nm_idmap_lock);
 817         nodemap->nm_fs_to_client_uidmap = RB_ROOT;
 818         nodemap->nm_client_to_fs_uidmap = RB_ROOT;
 819         nodemap->nm_fs_to_client_gidmap = RB_ROOT;
 820         nodemap->nm_client_to_fs_gidmap = RB_ROOT;
 821
 822         if (is_default) {
 823                 nodemap->nm_id = LUSTRE_NODEMAP_DEFAULT_ID;
 824                 config->nmc_default_nodemap = nodemap;
 825         } else {
 826                 config->nmc_nodemap_highest_id++;
 827                 nodemap->nm_id = config->nmc_nodemap_highest_id;
 828         }
 829
 830         if (is_default || default_nodemap == NULL) {
 831                 nodemap->nmf_trust_client_ids = 0;
 832                 nodemap->nmf_allow_root_access = 0;
 833
 834                 nodemap->nm_squash_uid = NODEMAP_NOBODY_UID;
 835                 nodemap->nm_squash_gid = NODEMAP_NOBODY_GID;
 836                 if (!is_default)
 837                         CWARN("adding nodemap '%s' to config without"
 838                               " default nodemap\n", nodemap->nm_name);
 839         } else {
 840                 nodemap->nmf_trust_client_ids =
 841                                 default_nodemap->nmf_trust_client_ids;
 842                 nodemap->nmf_allow_root_access =
 843                                 default_nodemap->nmf_allow_root_access;
 844
 845                 nodemap->nm_squash_uid = default_nodemap->nm_squash_uid;
 846                 nodemap->nm_squash_gid = default_nodemap->nm_squash_gid;
 847         }
 848
 849         return nodemap;
 850
 851 out:
 852         CERROR("cannot add nodemap: '%s': rc = %d\n", name, rc);
 853         return ERR_PTR(rc);
 854 }
 855
 856 /**
 857  * update flag to turn on or off nodemap functions
 858  * \param       name            nodemap name
 859  * \param       admin_string    string containing updated value
 860  * \retval      0 on success
 861  *
 862  * Update admin flag to turn on or off nodemap functions.
 863  */
 864 int nodemap_set_allow_root(const char *name, bool allow_root)
 865 {
 866         struct lu_nodemap       *nodemap = NULL;
 867         int                     rc = 0;
 868
 869         mutex_lock(&active_config_lock);
 870         nodemap = nodemap_lookup(name);
 871         mutex_unlock(&active_config_lock);
 872         if (IS_ERR(nodemap))
 873                 GOTO(out, rc = PTR_ERR(nodemap));
 874
 875         nodemap->nmf_allow_root_access = allow_root;
 876         rc = nodemap_idx_nodemap_update(nodemap);
 877
 878         nm_member_revoke_locks(nodemap);
 879         nodemap_putref(nodemap);
 880 out:
 881         return rc;
 882 }
 883 EXPORT_SYMBOL(nodemap_set_allow_root);
 884
 885 /**
 886  * updated trust_client_ids flag for nodemap
 887  *
 888  * \param       name            nodemap name
 889  * \param       trust_string    new value for trust flag
 890  * \retval      0 on success
 891  *
 892  * Update the trust_client_ids flag for a nodemap.
 893  */
 894 int nodemap_set_trust_client_ids(const char *name, bool trust_client_ids)
 895 {
 896         struct lu_nodemap       *nodemap = NULL;
 897         int                     rc = 0;
 898
 899         mutex_lock(&active_config_lock);
 900         nodemap = nodemap_lookup(name);
 901         mutex_unlock(&active_config_lock);
 902         if (IS_ERR(nodemap))
 903                 GOTO(out, rc = PTR_ERR(nodemap));
 904
 905         nodemap->nmf_trust_client_ids = trust_client_ids;
 906         rc = nodemap_idx_nodemap_update(nodemap);
 907
 908         nm_member_revoke_locks(nodemap);
 909         nodemap_putref(nodemap);
 910 out:
 911         return rc;
 912 }
 913 EXPORT_SYMBOL(nodemap_set_trust_client_ids);
 914
 915 /**
 916  * update the squash_uid for a nodemap
 917  *
 918  * \param       name            nodemap name
 919  * \param       uid_string      string containing new squash_uid value
 920  * \retval      0 on success
 921  *
 922  * Update the squash_uid for a nodemap. The squash_uid is the uid
 923  * that the all client uids are mapped to if nodemap is active,
 924  * the trust_client_ids flag is not set, and the uid is not in
 925  * the idmap tree.
 926  */
 927 int nodemap_set_squash_uid(const char *name, uid_t uid)
 928 {
 929         struct lu_nodemap       *nodemap = NULL;
 930         int                     rc = 0;
 931
 932         mutex_lock(&active_config_lock);
 933         nodemap = nodemap_lookup(name);
 934         mutex_unlock(&active_config_lock);
 935         if (IS_ERR(nodemap))
 936                 GOTO(out, rc = PTR_ERR(nodemap));
 937
 938         nodemap->nm_squash_uid = uid;
 939         rc = nodemap_idx_nodemap_update(nodemap);
 940
 941         nm_member_revoke_locks(nodemap);
 942         nodemap_putref(nodemap);
 943 out:
 944         return rc;
 945 }
 946 EXPORT_SYMBOL(nodemap_set_squash_uid);
 947
 948 /**
 949  * Update the squash_gid for a nodemap.
 950  *
 951  * \param       name            nodemap name
 952  * \param       gid_string      string containing new squash_gid value
 953  * \retval      0 on success
 954  *
 955  * Update the squash_gid for a nodemap. The squash_uid is the gid
 956  * that the all client gids are mapped to if nodemap is active,
 957  * the trust_client_ids flag is not set, and the gid is not in
 958  * the idmap tree.
 959  */
 960 int nodemap_set_squash_gid(const char *name, gid_t gid)
 961 {
 962         struct lu_nodemap       *nodemap = NULL;
 963         int                     rc = 0;
 964
 965         mutex_lock(&active_config_lock);
 966         nodemap = nodemap_lookup(name);
 967         mutex_unlock(&active_config_lock);
 968         if (IS_ERR(nodemap))
 969                 GOTO(out, rc = PTR_ERR(nodemap));
 970
 971         nodemap->nm_squash_gid = gid;
 972         rc = nodemap_idx_nodemap_update(nodemap);
 973
 974         nm_member_revoke_locks(nodemap);
 975         nodemap_putref(nodemap);
 976 out:
 977         return rc;
 978 }
 979 EXPORT_SYMBOL(nodemap_set_squash_gid);
 980
 981 /**
 982  * Returns true if this nodemap has root user access. Always returns true if
 983  * nodemaps are not active.
 984  *
 985  * \param       nodemap         nodemap to check access for
 986  */
 987 bool nodemap_can_setquota(const struct lu_nodemap *nodemap)
 988 {
 989         return !nodemap_active || nodemap->nmf_allow_root_access;
 990 }
 991 EXPORT_SYMBOL(nodemap_can_setquota);
 992
 993 /**
 994  * Add a nodemap
 995  *
 996  * \param       name            name of nodemap
 997  * \retval      0               success
 998  * \retval      -EINVAL         invalid nodemap name
 999  * \retval      -EEXIST         nodemap already exists
1000  * \retval      -ENOMEM         cannot allocate memory for nodemap
1001  */
1002 int nodemap_add(const char *nodemap_name)
1003 {
1004         struct lu_nodemap *nodemap;
1005         int rc;
1006
1007         mutex_lock(&active_config_lock);
1008         nodemap = nodemap_create(nodemap_name, active_config, 0);
1009         if (IS_ERR(nodemap)) {
1010                 mutex_unlock(&active_config_lock);
1011                 return PTR_ERR(nodemap);
1012         }
1013
1014         rc = nodemap_idx_nodemap_add(nodemap);
1015         if (rc == 0)
1016                 rc = lprocfs_nodemap_register(nodemap, 0);
1017
1018         mutex_unlock(&active_config_lock);
1019         nodemap_putref(nodemap);
1020
1021         return rc;
1022 }
1023 EXPORT_SYMBOL(nodemap_add);
1024
1025 /**
1026  * Delete a nodemap
1027  *
1028  * \param       name            name of nodemmap
1029  * \retval      0               success
1030  * \retval      -EINVAL         invalid input
1031  * \retval      -ENOENT         no existing nodemap
1032  */
1033 int nodemap_del(const char *nodemap_name)
1034 {
1035         struct lu_nodemap       *nodemap;
1036         struct lu_nid_range     *range;
1037         struct lu_nid_range     *range_temp;
1038         int                      rc = 0;
1039         int                      rc2 = 0;
1040
1041         if (strcmp(nodemap_name, DEFAULT_NODEMAP) == 0)
1042                 RETURN(-EINVAL);
1043
1044         mutex_lock(&active_config_lock);
1045         nodemap = cfs_hash_del_key(active_config->nmc_nodemap_hash,
1046                                    nodemap_name);
1047         if (nodemap == NULL) {
1048                 mutex_unlock(&active_config_lock);
1049                 GOTO(out, rc = -ENOENT);
1050         }
1051
1052         /* erase nodemap from active ranges to prevent client assignment */
1053         down_write(&active_config->nmc_range_tree_lock);
1054         list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
1055                                  rn_list) {
1056                 rc2 = nodemap_idx_range_del(range);
1057                 if (rc2 < 0)
1058                         rc = rc2;
1059
1060                 range_delete(&active_config->nmc_range_tree, range);
1061         }
1062         up_write(&active_config->nmc_range_tree_lock);
1063
1064         rc2 = nodemap_idx_nodemap_del(nodemap);
1065         if (rc2 < 0)
1066                 rc = rc2;
1067
1068         /*
1069          * remove procfs here in case nodemap_create called with same name
1070          * before nodemap_destroy is run.
1071          */
1072         lprocfs_nodemap_remove(nodemap->nm_pde_data);
1073         nodemap->nm_pde_data = NULL;
1074         mutex_unlock(&active_config_lock);
1075
1076         nodemap_putref(nodemap);
1077
1078 out:
1079         return rc;
1080 }
1081 EXPORT_SYMBOL(nodemap_del);
1082
1083 /**
1084  * activate nodemap functions
1085  *
1086  * \param       value           1 for on, 0 for off
1087  */
1088 void nodemap_activate(const bool value)
1089 {
1090         mutex_lock(&active_config_lock);
1091         active_config->nmc_nodemap_is_active = value;
1092
1093         /* copy active value to global to avoid locking in map functions */
1094         nodemap_active = value;
1095         nodemap_idx_nodemap_activate(value);
1096         mutex_unlock(&active_config_lock);
1097         nm_member_revoke_all();
1098 }
1099 EXPORT_SYMBOL(nodemap_activate);
1100
1101 /**
1102  * Helper iterator to convert nodemap hash to list.
1103  *
1104  * \param       hs                      hash structure
1105  * \param       bd                      bucket descriptor
1106  * \param       hnode                   hash node
1107  * \param       nodemap_list_head       list head for list of nodemaps in hash
1108  */
1109 static int nodemap_cleanup_iter_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1110                                    struct hlist_node *hnode,
1111                                    void *nodemap_list_head)
1112 {
1113         struct lu_nodemap *nodemap;
1114
1115         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
1116         list_add(&nodemap->nm_list, nodemap_list_head);
1117
1118         cfs_hash_bd_del_locked(hs, bd, hnode);
1119
1120         return 0;
1121 }
1122
1123 /**
1124  * Walk the nodemap_hash and remove all nodemaps.
1125  */
1126 void nodemap_config_cleanup(struct nodemap_config *config)
1127 {
1128         struct lu_nodemap       *nodemap = NULL;
1129         struct lu_nodemap       *nodemap_temp;
1130         struct lu_nid_range     *range;
1131         struct lu_nid_range     *range_temp;
1132         LIST_HEAD(nodemap_list_head);
1133
1134         cfs_hash_for_each_safe(config->nmc_nodemap_hash,
1135                                nodemap_cleanup_iter_cb, &nodemap_list_head);
1136         cfs_hash_putref(config->nmc_nodemap_hash);
1137
1138         /* Because nodemap_destroy might sleep, we can't destroy them
1139          * in cfs_hash_for_each, so we build a list there and destroy here
1140          */
1141         list_for_each_entry_safe(nodemap, nodemap_temp, &nodemap_list_head,
1142                                  nm_list) {
1143                 down_write(&config->nmc_range_tree_lock);
1144                 list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
1145                                          rn_list)
1146                         range_delete(&config->nmc_range_tree, range);
1147                 up_write(&config->nmc_range_tree_lock);
1148
1149                 nodemap_putref(nodemap);
1150         }
1151 }
1152
1153 struct nodemap_config *nodemap_config_alloc(void)
1154 {
1155         struct nodemap_config *config;
1156         int rc = 0;
1157
1158         OBD_ALLOC_PTR(config);
1159         if (config == NULL)
1160                 return ERR_PTR(-ENOMEM);
1161
1162         rc = nodemap_init_hash(config);
1163         if (rc != 0) {
1164                 OBD_FREE_PTR(config);
1165                 return ERR_PTR(rc);
1166         }
1167
1168         init_rwsem(&config->nmc_range_tree_lock);
1169
1170         return config;
1171 }
1172
1173 void nodemap_config_dealloc(struct nodemap_config *config)
1174 {
1175         nodemap_config_cleanup(config);
1176         OBD_FREE_PTR(config);
1177 }
1178
1179 static int nm_hash_list_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1180                            struct hlist_node *hnode,
1181                            void *nodemap_list_head)
1182 {
1183         struct lu_nodemap *nodemap;
1184
1185         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
1186         list_add(&nodemap->nm_list, nodemap_list_head);
1187         return 0;
1188 }
1189
1190 void nodemap_config_set_active(struct nodemap_config *config)
1191 {
1192         struct nodemap_config   *old_config = active_config;
1193         struct lu_nodemap       *nodemap;
1194         struct lu_nodemap       *tmp;
1195         LIST_HEAD(nodemap_list_head);
1196
1197         ENTRY;
1198
1199         LASSERT(active_config != config);
1200
1201         mutex_lock(&active_config_lock);
1202
1203         /* move proc entries from already existing nms, create for new nms */
1204         cfs_hash_for_each_safe(config->nmc_nodemap_hash,
1205                                nm_hash_list_cb, &nodemap_list_head);
1206         list_for_each_entry_safe(nodemap, tmp, &nodemap_list_head, nm_list) {
1207                 struct lu_nodemap *old_nm = NULL;
1208
1209                 if (active_config != NULL)
1210                         old_nm = cfs_hash_lookup(
1211                                         active_config->nmc_nodemap_hash,
1212                                         nodemap->nm_name);
1213                 if (old_nm != NULL) {
1214                         nodemap->nm_pde_data = old_nm->nm_pde_data;
1215                         old_nm->nm_pde_data = NULL;
1216                         nodemap_putref(old_nm);
1217                 } else {
1218                         bool is_def = (nodemap == config->nmc_default_nodemap);
1219
1220                         lprocfs_nodemap_register(nodemap, is_def);
1221                 }
1222         }
1223
1224         /* if new config is inactive, deactivate live config before switching */
1225         if (!config->nmc_nodemap_is_active)
1226                 nodemap_active = false;
1227         active_config = config;
1228         if (config->nmc_nodemap_is_active)
1229                 nodemap_active = true;
1230
1231         mutex_unlock(&active_config_lock);
1232
1233         if (old_config != NULL)
1234                 nodemap_config_dealloc(old_config);
1235
1236         nm_member_revoke_all();
1237
1238         EXIT;
1239 }
1240
1241 /**
1242  * Cleanup nodemap module on exit
1243  */
1244 void nodemap_mod_exit(void)
1245 {
1246         nodemap_config_dealloc(active_config);
1247         nodemap_procfs_exit();
1248 }
1249
1250 /**
1251  * Initialize the nodemap module
1252  */
1253 int nodemap_mod_init(void)
1254 {
1255         struct nodemap_config   *new_config;
1256         struct lu_nodemap       *nodemap;
1257         int                      rc = 0;
1258
1259         rc = nodemap_procfs_init();
1260         if (rc != 0)
1261                 return rc;
1262
1263         new_config = nodemap_config_alloc();
1264         if (IS_ERR(new_config)) {
1265                 nodemap_procfs_exit();
1266                 GOTO(out, rc = PTR_ERR(new_config));
1267         }
1268
1269         nodemap = nodemap_create(DEFAULT_NODEMAP, new_config, 1);
1270         if (IS_ERR(nodemap)) {
1271                 nodemap_config_dealloc(new_config);
1272                 nodemap_procfs_exit();
1273                 GOTO(out, rc = PTR_ERR(nodemap));
1274         }
1275
1276         nodemap_config_set_active(new_config);
1277         nodemap_putref(nodemap);
1278
1279 out:
1280         return rc;
1281 }
1282
1283 /**
1284  * Revoke locks for all nodemaps.
1285  */
1286 void nm_member_revoke_all(void)
1287 {
1288         struct lu_nodemap *nodemap;
1289         struct lu_nodemap *tmp;
1290         LIST_HEAD(nodemap_list_head);
1291
1292         mutex_lock(&active_config_lock);
1293         cfs_hash_for_each_safe(active_config->nmc_nodemap_hash,
1294                                nm_hash_list_cb, &nodemap_list_head);
1295
1296         /* revoke_locks sleeps, so can't call in cfs hash cb */
1297         list_for_each_entry_safe(nodemap, tmp, &nodemap_list_head, nm_list)
1298                 nm_member_revoke_locks(nodemap);
1299         mutex_unlock(&active_config_lock);
1300 }
1301
1302 /**
1303  * Returns the nodemap classification for a given nid into an ioctl buffer.
1304  * Useful for testing the nodemap configuration to make sure it is working as
1305  * expected.
1306  *
1307  * \param       nid             nid to classify
1308  * \param[out]  name_buf        buffer to write the nodemap name to
1309  * \param       name_len        length of buffer
1310  */
1311 void nodemap_test_nid(lnet_nid_t nid, char *name_buf, size_t name_len)
1312 {
1313         struct lu_nodemap       *nodemap;
1314
1315         mutex_lock(&active_config_lock);
1316         down_read(&active_config->nmc_range_tree_lock);
1317         nodemap = nodemap_classify_nid(nid);
1318         up_read(&active_config->nmc_range_tree_lock);
1319         mutex_unlock(&active_config_lock);
1320
1321         strncpy(name_buf, nodemap->nm_name, name_len);
1322         if (name_len > 0)
1323                 name_buf[name_len - 1] = '\0';
1324
1325         nodemap_putref(nodemap);
1326 }
1327 EXPORT_SYMBOL(nodemap_test_nid);
1328
1329 /**
1330  * Returns the id mapping for a given nid/id pair. Useful for testing the
1331  * nodemap configuration to make sure it is working as expected.
1332  *
1333  * \param       nid             nid to classify
1334  * \param       idtype          uid or gid
1335  * \param       client_id       id to map to fs
1336  *
1337  * \retval      the mapped fs_id of the given client_id
1338  */
1339 __u32 nodemap_test_id(lnet_nid_t nid, enum nodemap_id_type idtype,
1340                       __u32 client_id)
1341 {
1342         struct lu_nodemap       *nodemap;
1343         __u32                    fs_id;
1344
1345         mutex_lock(&active_config_lock);
1346         down_read(&active_config->nmc_range_tree_lock);
1347         nodemap = nodemap_classify_nid(nid);
1348         up_read(&active_config->nmc_range_tree_lock);
1349         mutex_unlock(&active_config_lock);
1350
1351         fs_id = nodemap_map_id(nodemap, idtype, NODEMAP_CLIENT_TO_FS,
1352                                client_id);
1353         nodemap_putref(nodemap);
1354
1355         return fs_id;
1356 }
1357 EXPORT_SYMBOL(nodemap_test_id);