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 /* Highest numerical lu_nodemap.nm_id defined */
  48 static atomic_t nodemap_highest_id;
  49
  50 /* Simple flag to determine if nodemaps are active */
  51 bool nodemap_active;
  52
  53 /**
  54  * pointer to default nodemap kept to keep from
  55  * lookup it up in the hash since it is needed
  56  * more often
  57  */
  58 static struct lu_nodemap *default_nodemap;
  59
  60 /**
  61  * Lock required to access the range tree.
  62  */
  63 rwlock_t nm_range_tree_lock;
  64
  65 /**
  66  * Hash keyed on nodemap name containing all
  67  * nodemaps
  68  */
  69 static struct cfs_hash *nodemap_hash;
  70
  71 /**
  72  * Nodemap destructor
  73  *
  74  * \param       nodemap         nodemap to destroy
  75  */
  76 static void nodemap_destroy(struct lu_nodemap *nodemap)
  77 {
  78         struct lu_nid_range *range;
  79         struct lu_nid_range *range_temp;
  80
  81         write_lock(&nm_range_tree_lock);
  82         list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
  83                                  rn_list) {
  84                 range_delete(range);
  85         }
  86         write_unlock(&nm_range_tree_lock);
  87
  88         write_lock(&nodemap->nm_idmap_lock);
  89         idmap_delete_tree(nodemap);
  90         write_unlock(&nodemap->nm_idmap_lock);
  91         nm_member_reclassify_nodemap(nodemap);
  92         if (!cfs_hash_is_empty(nodemap->nm_member_hash))
  93                 CWARN("nodemap_destroy failed to reclassify all members\n");
  94
  95         nm_member_delete_hash(nodemap);
  96
  97         OBD_FREE_PTR(nodemap);
  98 }
  99
 100 /**
 101  * Functions used for the cfs_hash
 102  */
 103 static void nodemap_getref(struct lu_nodemap *nodemap)
 104 {
 105         atomic_inc(&nodemap->nm_refcount);
 106 }
 107
 108 void nodemap_putref(struct lu_nodemap *nodemap)
 109 {
 110         LASSERT(nodemap != NULL);
 111         LASSERT(atomic_read(&nodemap->nm_refcount) > 0);
 112
 113         if (atomic_dec_and_test(&nodemap->nm_refcount))
 114                 nodemap_destroy(nodemap);
 115 }
 116
 117 static __u32 nodemap_hashfn(struct cfs_hash *hash_body,
 118                             const void *key, unsigned mask)
 119 {
 120         return cfs_hash_djb2_hash(key, strlen(key), mask);
 121 }
 122
 123 static void *nodemap_hs_key(struct hlist_node *hnode)
 124 {
 125         struct lu_nodemap *nodemap;
 126
 127         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 128
 129         return nodemap->nm_name;
 130 }
 131
 132 static int nodemap_hs_keycmp(const void *key,
 133                              struct hlist_node *compared_hnode)
 134 {
 135         char *nodemap_name;
 136
 137         nodemap_name = nodemap_hs_key(compared_hnode);
 138
 139         return !strcmp(key, nodemap_name);
 140 }
 141
 142 static void *nodemap_hs_hashobject(struct hlist_node *hnode)
 143 {
 144         return hlist_entry(hnode, struct lu_nodemap, nm_hash);
 145 }
 146
 147 static void nodemap_hs_get(struct cfs_hash *hs, struct hlist_node *hnode)
 148 {
 149         struct lu_nodemap *nodemap;
 150
 151         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 152         nodemap_getref(nodemap);
 153 }
 154
 155 static void nodemap_hs_put_locked(struct cfs_hash *hs,
 156                                   struct hlist_node *hnode)
 157 {
 158         struct lu_nodemap *nodemap;
 159
 160         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 161         nodemap_putref(nodemap);
 162 }
 163
 164 static struct cfs_hash_ops nodemap_hash_operations = {
 165         .hs_hash        = nodemap_hashfn,
 166         .hs_key         = nodemap_hs_key,
 167         .hs_keycmp      = nodemap_hs_keycmp,
 168         .hs_object      = nodemap_hs_hashobject,
 169         .hs_get         = nodemap_hs_get,
 170         .hs_put_locked  = nodemap_hs_put_locked,
 171 };
 172
 173 /* end of cfs_hash functions */
 174
 175 /**
 176  * Helper iterator to convert nodemap hash to list.
 177  *
 178  * \param       hs                      hash structure
 179  * \param       bd                      bucket descriptor
 180  * \param       hnode                   hash node
 181  * \param       nodemap_list_head       list head for list of nodemaps in hash
 182  */
 183 static int nodemap_cleanup_iter_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
 184                                    struct hlist_node *hnode,
 185                                    void *nodemap_list_head)
 186 {
 187         struct lu_nodemap       *nodemap;
 188
 189         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
 190         list_add(&nodemap->nm_list, (struct list_head *)nodemap_list_head);
 191
 192         return 0;
 193 }
 194
 195 /**
 196  * Walk the nodemap_hash and remove all nodemaps.
 197  */
 198 void nodemap_cleanup_all(void)
 199 {
 200         struct lu_nodemap *nodemap = NULL;
 201         struct list_head *pos, *next;
 202         struct list_head nodemap_list_head = LIST_HEAD_INIT(nodemap_list_head);
 203
 204         cfs_hash_for_each_safe(nodemap_hash, nodemap_cleanup_iter_cb,
 205                                &nodemap_list_head);
 206         cfs_hash_putref(nodemap_hash);
 207
 208         /* Because nodemap_destroy might sleep, we can't destroy them
 209          * in cfs_hash_for_each. Instead we build a list and destroy here
 210          */
 211         list_for_each_safe(pos, next, &nodemap_list_head) {
 212                 nodemap = list_entry(pos, struct lu_nodemap, nm_list);
 213                 nodemap_putref(nodemap);
 214         }
 215 }
 216
 217 /**
 218  * Initialize nodemap_hash
 219  *
 220  * \retval      0               success
 221  * \retval      -ENOMEM         cannot create hash
 222  */
 223 static int nodemap_init_hash(void)
 224 {
 225         nodemap_hash = cfs_hash_create("NODEMAP", HASH_NODEMAP_CUR_BITS,
 226                                        HASH_NODEMAP_MAX_BITS,
 227                                        HASH_NODEMAP_BKT_BITS, 0,
 228                                        CFS_HASH_MIN_THETA,
 229                                        CFS_HASH_MAX_THETA,
 230                                        &nodemap_hash_operations,
 231                                        CFS_HASH_DEFAULT);
 232
 233         if (nodemap_hash == NULL) {
 234                 CERROR("cannot create nodemap_hash table\n");
 235                 return -ENOMEM;
 236         }
 237
 238         return 0;
 239 }
 240
 241 /**
 242  * Check for valid nodemap name
 243  *
 244  * \param       name            nodemap name
 245  * \retval      true            valid
 246  * \retval      false           invalid
 247  */
 248 static bool nodemap_name_is_valid(const char *name)
 249 {
 250         if (strlen(name) > LUSTRE_NODEMAP_NAME_LENGTH ||
 251             strlen(name) == 0)
 252                 return false;
 253
 254         for (; *name != '\0'; name++) {
 255                 if (!isalnum(*name) && *name != '_')
 256                         return false;
 257         }
 258
 259         return true;
 260 }
 261
 262 /**
 263  * Nodemap lookup
 264  *
 265  * Look nodemap up in the nodemap hash
 266  *
 267  * \param       name            name of nodemap
 268  * \param       nodemap         found nodemap or NULL
 269  * \retval      lu_nodemap      named nodemap
 270  * \retval      NULL            nodemap doesn't exist
 271  */
 272 static int nodemap_lookup(const char *name, struct lu_nodemap **nodemap)
 273 {
 274         int rc = 0;
 275
 276         *nodemap = NULL;
 277
 278         if (!nodemap_name_is_valid(name))
 279                 GOTO(out, rc = -EINVAL);
 280
 281         *nodemap = cfs_hash_lookup(nodemap_hash, name);
 282         if (*nodemap == NULL)
 283                 rc = -ENOENT;
 284
 285 out:
 286         return rc;
 287 }
 288
 289 /**
 290  * classify the nid into the proper nodemap
 291  *
 292  * \param       nid                     nid to classify
 293  * \retval      nodemap                 nodemap containing the nid
 294  * \retval      default_nodemap         default nodemap
 295  */
 296 struct lu_nodemap *nodemap_classify_nid(lnet_nid_t nid)
 297 {
 298         struct lu_nid_range     *range;
 299
 300         range = range_search(nid);
 301         if (range != NULL)
 302                 return range->rn_nodemap;
 303
 304         return default_nodemap;
 305 }
 306 EXPORT_SYMBOL(nodemap_classify_nid);
 307
 308 /**
 309  * simple check for default nodemap
 310  */
 311 static bool is_default_nodemap(const struct lu_nodemap *nodemap)
 312 {
 313         return nodemap->nm_id == 0;
 314 }
 315
 316 /**
 317  * parse a nodemap range string into two nids
 318  *
 319  * \param       range_str               string to parse
 320  * \param       range[2]                array of two nids
 321  * \reyval      0 on success
 322  */
 323 int nodemap_parse_range(const char *range_str, lnet_nid_t range[2])
 324 {
 325         char    buf[LNET_NIDSTR_SIZE * 2 + 2];
 326         char    *ptr = NULL;
 327         char    *start_nidstr;
 328         char    *end_nidstr;
 329         int     rc = 0;
 330
 331         snprintf(buf, sizeof(buf), "%s", range_str);
 332         ptr = buf;
 333         start_nidstr = strsep(&ptr, ":");
 334         end_nidstr = strsep(&ptr, ":");
 335
 336         if (start_nidstr == NULL || end_nidstr == NULL)
 337                 GOTO(out, rc = -EINVAL);
 338
 339         range[0] = libcfs_str2nid(start_nidstr);
 340         range[1] = libcfs_str2nid(end_nidstr);
 341
 342 out:
 343         return rc;
 344
 345 }
 346 EXPORT_SYMBOL(nodemap_parse_range);
 347
 348 /**
 349  * parse a string containing an id map of form "client_id:filesystem_id"
 350  * into an array of __u32 * for use in mapping functions
 351  *
 352  * \param       idmap_str               map string
 353  * \param       idmap                   array[2] of __u32
 354  *
 355  * \retval      0 on success
 356  * \retval      -EINVAL if idmap cannot be parsed
 357  */
 358 int nodemap_parse_idmap(char *idmap_str, __u32 idmap[2])
 359 {
 360         char                    *sep;
 361         long unsigned int        idmap_buf;
 362         int                      rc;
 363
 364         if (idmap_str == NULL)
 365                 return -EINVAL;
 366
 367         sep = strchr(idmap_str, ':');
 368         if (sep == NULL)
 369                 return -EINVAL;
 370         *sep = '\0';
 371         sep++;
 372
 373         rc = kstrtoul(idmap_str, 10, &idmap_buf);
 374         if (rc != 0)
 375                 return -EINVAL;
 376         idmap[0] = idmap_buf;
 377
 378         rc = kstrtoul(sep, 10, &idmap_buf);
 379         if (rc != 0)
 380                 return -EINVAL;
 381         idmap[1] = idmap_buf;
 382
 383         return 0;
 384 }
 385 EXPORT_SYMBOL(nodemap_parse_idmap);
 386
 387 /**
 388  * add a member to a nodemap
 389  *
 390  * \param       nid             nid to add to the members
 391  * \param       exp             obd_export structure for the connection
 392  *                              that is being added
 393  * \retval      -EINVAL         export is NULL
 394  * \retval      -EEXIST         export is already member of a nodemap
 395  */
 396 int nodemap_add_member(lnet_nid_t nid, struct obd_export *exp)
 397 {
 398         struct lu_nodemap       *nodemap;
 399         int rc;
 400
 401         read_lock(&nm_range_tree_lock);
 402         nodemap = nodemap_classify_nid(nid);
 403         rc = nm_member_add(nodemap, exp);
 404         read_unlock(&nm_range_tree_lock);
 405         return rc;
 406 }
 407 EXPORT_SYMBOL(nodemap_add_member);
 408
 409 /**
 410  * delete a member from a nodemap
 411  *
 412  * \param       exp             export to remove from a nodemap
 413  */
 414 void nodemap_del_member(struct obd_export *exp)
 415 {
 416         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 417
 418         if (nodemap != NULL)
 419                 nm_member_del(nodemap, exp);
 420 }
 421 EXPORT_SYMBOL(nodemap_del_member);
 422
 423 /**
 424  * add an idmap to the proper nodemap trees
 425  *
 426  * \param       name            name of nodemap
 427  * \param       id_type         NODEMAP_UID or NODEMAP_GID
 428  * \param       map             array[2] __u32 containing the map values
 429  *                              map[0] is client id
 430  *                              map[1] is the filesystem id
 431  *
 432  * \retval      0 on success
 433  */
 434 int nodemap_add_idmap(const char *name, enum nodemap_id_type id_type,
 435                       const __u32 map[2])
 436 {
 437         struct lu_nodemap       *nodemap = NULL;
 438         struct lu_idmap         *idmap;
 439         int                     rc = 0;
 440
 441         rc = nodemap_lookup(name, &nodemap);
 442         if (nodemap == NULL || is_default_nodemap(nodemap))
 443                 GOTO(out, rc = -EINVAL);
 444
 445         idmap = idmap_create(map[0], map[1]);
 446         if (idmap == NULL)
 447                 GOTO(out_putref, rc = -ENOMEM);
 448
 449         write_lock(&nodemap->nm_idmap_lock);
 450         idmap_insert(id_type, idmap, nodemap);
 451         write_unlock(&nodemap->nm_idmap_lock);
 452         nm_member_revoke_locks(nodemap);
 453
 454 out_putref:
 455         nodemap_putref(nodemap);
 456 out:
 457         return rc;
 458 }
 459 EXPORT_SYMBOL(nodemap_add_idmap);
 460
 461 /**
 462  * delete idmap from proper nodemap tree
 463  *
 464  * \param       name            name of nodemap
 465  * \param       id_type         NODEMAP_UID or NODEMAP_GID
 466  * \param       map             array[2] __u32 containing the mapA values
 467  *                              map[0] is client id
 468  *                              map[1] is the filesystem id
 469  *
 470  * \retval      0 on success
 471  */
 472 int nodemap_del_idmap(const char *name, enum nodemap_id_type id_type,
 473                       const __u32 map[2])
 474 {
 475         struct lu_nodemap       *nodemap = NULL;
 476         struct lu_idmap         *idmap = NULL;
 477         int                     rc = 0;
 478
 479         rc = nodemap_lookup(name, &nodemap);
 480         if (nodemap == NULL || is_default_nodemap(nodemap))
 481                 GOTO(out, rc = -EINVAL);
 482
 483         write_lock(&nodemap->nm_idmap_lock);
 484         idmap = idmap_search(nodemap, NODEMAP_CLIENT_TO_FS, id_type,
 485                              map[0]);
 486         if (idmap == NULL) {
 487                 write_unlock(&nodemap->nm_idmap_lock);
 488                 GOTO(out_putref, rc = -EINVAL);
 489         }
 490
 491         idmap_delete(id_type, idmap, nodemap);
 492         write_unlock(&nodemap->nm_idmap_lock);
 493         nm_member_revoke_locks(nodemap);
 494
 495 out_putref:
 496         nodemap_putref(nodemap);
 497 out:
 498         return rc;
 499 }
 500 EXPORT_SYMBOL(nodemap_del_idmap);
 501
 502 /**
 503  * mapping function for nodemap idmaps
 504  *
 505  * \param       nodemap         lu_nodemap structure defining nodemap
 506  * \param       node_type       NODEMAP_UID or NODEMAP_GID
 507  * \param       tree_type       NODEMAP_CLIENT_TO_FS or
 508  *                              NODEMAP_FS_TO_CLIENT
 509  * \param       id              id to map
 510  *
 511  * \retval      mapped id according to the rules below.
 512  *
 513  * if the nodemap_active is false, just return the passed id without mapping
 514  *
 515  * if the id to be looked up is 0, check that root access is allowed and if it
 516  * is, return 0. Otherwise, return the squash uid or gid.
 517  *
 518  * if the nodemap is configured to trusted the ids from the client system, just
 519  * return the passwd id without mapping.
 520  *
 521  * if by this point, we haven't returned and the nodemap in question is the
 522  * default nodemap, return the squash uid or gid.
 523  *
 524  * after these checks, search the proper tree for the mapping, and if found
 525  * return the mapped value, otherwise return the squash uid or gid.
 526  */
 527 __u32 nodemap_map_id(struct lu_nodemap *nodemap,
 528                      enum nodemap_id_type id_type,
 529                      enum nodemap_tree_type tree_type, __u32 id)
 530 {
 531         struct lu_idmap         *idmap = NULL;
 532         __u32                    found_id;
 533
 534         if (!nodemap_active)
 535                 goto out;
 536
 537         if (unlikely(nodemap == NULL))
 538                 goto out;
 539
 540         if (id == 0) {
 541                 if (nodemap->nmf_allow_root_access)
 542                         goto out;
 543                 else
 544                         goto squash;
 545         }
 546
 547         if (nodemap->nmf_trust_client_ids)
 548                 goto out;
 549
 550         if (is_default_nodemap(nodemap))
 551                 goto squash;
 552
 553         read_lock(&nodemap->nm_idmap_lock);
 554         idmap = idmap_search(nodemap, tree_type, id_type, id);
 555         if (idmap == NULL) {
 556                 read_unlock(&nodemap->nm_idmap_lock);
 557                 goto squash;
 558         }
 559
 560         if (tree_type == NODEMAP_FS_TO_CLIENT)
 561                 found_id = idmap->id_client;
 562         else
 563                 found_id = idmap->id_fs;
 564         read_unlock(&nodemap->nm_idmap_lock);
 565         return found_id;
 566
 567 squash:
 568         if (id_type == NODEMAP_UID)
 569                 return nodemap->nm_squash_uid;
 570         else
 571                 return nodemap->nm_squash_gid;
 572 out:
 573         return id;
 574 }
 575 EXPORT_SYMBOL(nodemap_map_id);
 576
 577 /**
 578  * Map posix ACL entries according to the nodemap membership. Removes any
 579  * squashed ACLs.
 580  *
 581  * \param       lu_nodemap      nodemap
 582  * \param       buf             buffer containing xattr encoded ACLs
 583  * \param       size            size of ACLs in bytes
 584  * \param       tree_type       direction of mapping
 585  * \retval      size            new size of ACLs in bytes
 586  * \retval      -EINVAL         bad \a size param, see posix_acl_xattr_count()
 587  */
 588 ssize_t nodemap_map_acl(struct lu_nodemap *nodemap, void *buf, size_t size,
 589                         enum nodemap_tree_type tree_type)
 590 {
 591         posix_acl_xattr_header  *header = buf;
 592         posix_acl_xattr_entry   *entry = &header->a_entries[0];
 593         posix_acl_xattr_entry   *new_entry = entry;
 594         posix_acl_xattr_entry   *end;
 595         int                      count;
 596
 597         if (!nodemap_active)
 598                 return size;
 599
 600         if (unlikely(nodemap == NULL))
 601                 return size;
 602
 603         count = posix_acl_xattr_count(size);
 604         if (count < 0)
 605                 return -EINVAL;
 606         if (count == 0)
 607                 return 0;
 608
 609         for (end = entry + count; entry != end; entry++) {
 610                 __u16 tag = le16_to_cpu(entry->e_tag);
 611                 __u32 id = le32_to_cpu(entry->e_id);
 612
 613                 switch (tag) {
 614                 case ACL_USER:
 615                         id = nodemap_map_id(nodemap, NODEMAP_UID,
 616                                             tree_type, id);
 617                         if (id == nodemap->nm_squash_uid)
 618                                 continue;
 619                         entry->e_id = cpu_to_le32(id);
 620                         break;
 621                 case ACL_GROUP:
 622                         id = nodemap_map_id(nodemap, NODEMAP_GID,
 623                                             tree_type, id);
 624                         if (id == nodemap->nm_squash_gid)
 625                                 continue;
 626                         entry->e_id = cpu_to_le32(id);
 627                         break;
 628                 }
 629
 630                 /* if we skip an ACL, copy the following ones over it */
 631                 if (new_entry != entry)
 632                         *new_entry = *entry;
 633
 634                 new_entry++;
 635         }
 636
 637         return (void *)new_entry - (void *)header;
 638 }
 639 EXPORT_SYMBOL(nodemap_map_acl);
 640
 641 /*
 642  * add nid range to nodemap
 643  * \param       name            nodemap name
 644  * \param       range_st        string containing nid range
 645  * \retval      0 on success
 646  *
 647  * add an range to the global range tree and attached the
 648  * range to the named nodemap.
 649  */
 650 int nodemap_add_range(const char *name, const lnet_nid_t nid[2])
 651 {
 652         struct lu_nodemap       *nodemap = NULL;
 653         struct lu_nid_range     *range;
 654         int rc;
 655
 656         rc = nodemap_lookup(name, &nodemap);
 657         if (nodemap == NULL || is_default_nodemap(nodemap))
 658                 GOTO(out, rc = -EINVAL);
 659
 660         range = range_create(nid[0], nid[1], nodemap);
 661         if (range == NULL)
 662                 GOTO(out_putref, rc = -ENOMEM);
 663
 664         write_lock(&nm_range_tree_lock);
 665         rc = range_insert(range);
 666         if (rc != 0) {
 667                 CERROR("cannot insert nodemap range into '%s': rc = %d\n",
 668                       nodemap->nm_name, rc);
 669                 write_unlock(&nm_range_tree_lock);
 670                 list_del(&range->rn_list);
 671                 range_destroy(range);
 672                 GOTO(out_putref, rc = -ENOMEM);
 673         }
 674
 675         list_add(&range->rn_list, &nodemap->nm_ranges);
 676         write_unlock(&nm_range_tree_lock);
 677
 678         nm_member_reclassify_nodemap(default_nodemap);
 679         nm_member_revoke_locks(default_nodemap);
 680         nm_member_revoke_locks(nodemap);
 681
 682 out_putref:
 683         nodemap_putref(nodemap);
 684 out:
 685         return rc;
 686 }
 687 EXPORT_SYMBOL(nodemap_add_range);
 688
 689 /**
 690  * delete a range
 691  * \param       name            nodemap name
 692  * \param       range_str       string containing range
 693  * \retval      0 on success
 694  *
 695  * Delete range from global range tree, and remove it
 696  * from the list in the associated nodemap.
 697  */
 698 int nodemap_del_range(const char *name, const lnet_nid_t nid[2])
 699 {
 700         struct lu_nodemap       *nodemap;
 701         struct lu_nid_range     *range;
 702         int                     rc = 0;
 703
 704         rc = nodemap_lookup(name, &nodemap);
 705         if (nodemap == NULL || is_default_nodemap(nodemap))
 706                 GOTO(out, rc = -EINVAL);
 707
 708         write_lock(&nm_range_tree_lock);
 709         range = range_find(nid[0], nid[1]);
 710         if (range == NULL) {
 711                 write_unlock(&nm_range_tree_lock);
 712                 GOTO(out_putref, rc = -EINVAL);
 713         }
 714
 715         range_delete(range);
 716         write_unlock(&nm_range_tree_lock);
 717         nm_member_reclassify_nodemap(nodemap);
 718         nm_member_revoke_locks(default_nodemap);
 719         nm_member_revoke_locks(nodemap);
 720
 721 out_putref:
 722         nodemap_putref(nodemap);
 723 out:
 724         return rc;
 725 }
 726 EXPORT_SYMBOL(nodemap_del_range);
 727
 728 /**
 729  * Nodemap constructor
 730  *
 731  * Creates an lu_nodemap structure and assigns sane default
 732  * member values. If this is the default nodemap, the defaults
 733  * are the most restictive in xterms of mapping behavior. Otherwise
 734  * the default flags should be inherited from the default nodemap.
 735  * The adds nodemap to nodemap_hash.
 736  *
 737  * \param       name            name of nodemap
 738  * \param       is_default      true if default nodemap
 739  * \retval      0               success
 740  * \retval      -EINVAL         invalid nodemap name
 741  * \retval      -EEXIST         nodemap already exists
 742  * \retval      -ENOMEM         cannot allocate memory for nodemap
 743  */
 744 static int nodemap_create(const char *name, bool is_default)
 745 {
 746         struct lu_nodemap       *nodemap = NULL;
 747         int                     rc = 0;
 748
 749         if (!nodemap_name_is_valid(name))
 750                 GOTO(out, rc = -EINVAL);
 751
 752         OBD_ALLOC_PTR(nodemap);
 753         if (nodemap == NULL) {
 754                 CERROR("cannot allocate memory (%zu bytes)"
 755                        "for nodemap '%s'\n", sizeof(*nodemap),
 756                        name);
 757                 GOTO(out, rc = -ENOMEM);
 758         }
 759
 760         /*
 761          * take an extra reference to prevent nodemap from being destroyed
 762          * while its being created.
 763          */
 764         atomic_set(&nodemap->nm_refcount, 2);
 765         snprintf(nodemap->nm_name, sizeof(nodemap->nm_name), "%s", name);
 766         rc = cfs_hash_add_unique(nodemap_hash, name, &nodemap->nm_hash);
 767         if (rc != 0) {
 768                 OBD_FREE_PTR(nodemap);
 769                 GOTO(out, rc = -EEXIST);
 770         }
 771
 772
 773         rc = nm_member_init_hash(nodemap);
 774         if (rc != 0) {
 775                 OBD_FREE_PTR(nodemap);
 776                 goto out;
 777         }
 778
 779         INIT_LIST_HEAD(&nodemap->nm_ranges);
 780         INIT_LIST_HEAD(&nodemap->nm_list);
 781
 782         rwlock_init(&nodemap->nm_idmap_lock);
 783         nodemap->nm_fs_to_client_uidmap = RB_ROOT;
 784         nodemap->nm_client_to_fs_uidmap = RB_ROOT;
 785         nodemap->nm_fs_to_client_gidmap = RB_ROOT;
 786         nodemap->nm_client_to_fs_gidmap = RB_ROOT;
 787
 788         if (is_default) {
 789                 nodemap->nm_id = LUSTRE_NODEMAP_DEFAULT_ID;
 790                 nodemap->nmf_trust_client_ids = 0;
 791                 nodemap->nmf_allow_root_access = 0;
 792                 nodemap->nmf_block_lookups = 0;
 793
 794                 nodemap->nm_squash_uid = NODEMAP_NOBODY_UID;
 795                 nodemap->nm_squash_gid = NODEMAP_NOBODY_GID;
 796
 797                 lprocfs_nodemap_register(name, is_default, nodemap);
 798
 799                 default_nodemap = nodemap;
 800         } else {
 801                 nodemap->nm_id = atomic_inc_return(&nodemap_highest_id);
 802                 nodemap->nmf_trust_client_ids =
 803                                 default_nodemap->nmf_trust_client_ids;
 804                 nodemap->nmf_allow_root_access =
 805                                 default_nodemap->nmf_allow_root_access;
 806                 nodemap->nmf_block_lookups =
 807                                 default_nodemap->nmf_block_lookups;
 808
 809                 nodemap->nm_squash_uid = default_nodemap->nm_squash_uid;
 810                 nodemap->nm_squash_gid = default_nodemap->nm_squash_gid;
 811
 812                 lprocfs_nodemap_register(name, is_default, nodemap);
 813         }
 814
 815         if (rc == 0) {
 816                 nodemap_putref(nodemap);
 817                 goto out;
 818         }
 819
 820         CERROR("cannot add nodemap: '%s': rc = %d\n", name, rc);
 821         nodemap_destroy(nodemap);
 822
 823 out:
 824         return rc;
 825 }
 826
 827 /**
 828  * update flag to turn on or off nodemap functions
 829  * \param       name            nodemap name
 830  * \param       admin_string    string containing updated value
 831  * \retval      0 on success
 832  *
 833  * Update admin flag to turn on or off nodemap functions.
 834  */
 835 int nodemap_set_allow_root(const char *name, bool allow_root)
 836 {
 837         struct lu_nodemap       *nodemap = NULL;
 838         int                     rc = 0;
 839
 840         rc = nodemap_lookup(name, &nodemap);
 841         if (nodemap == NULL)
 842                 GOTO(out, rc = -ENOENT);
 843
 844         nodemap->nmf_allow_root_access = allow_root;
 845         nm_member_revoke_locks(nodemap);
 846         nodemap_putref(nodemap);
 847 out:
 848         return rc;
 849 }
 850 EXPORT_SYMBOL(nodemap_set_allow_root);
 851
 852 /**
 853  * updated trust_client_ids flag for nodemap
 854  *
 855  * \param       name            nodemap name
 856  * \param       trust_string    new value for trust flag
 857  * \retval      0 on success
 858  *
 859  * Update the trust_client_ids flag for a nodemap.
 860  */
 861 int nodemap_set_trust_client_ids(const char *name, bool trust_client_ids)
 862 {
 863         struct lu_nodemap       *nodemap = NULL;
 864         int                     rc = 0;
 865
 866         rc = nodemap_lookup(name, &nodemap);
 867         if (nodemap == NULL)
 868                 GOTO(out, rc = -ENOENT);
 869
 870         nodemap->nmf_trust_client_ids = trust_client_ids;
 871         nm_member_revoke_locks(nodemap);
 872         nodemap_putref(nodemap);
 873 out:
 874         return rc;
 875 }
 876 EXPORT_SYMBOL(nodemap_set_trust_client_ids);
 877
 878 /**
 879  * update the squash_uid for a nodemap
 880  *
 881  * \param       name            nodemap name
 882  * \param       uid_string      string containing new squash_uid value
 883  * \retval      0 on success
 884  *
 885  * Update the squash_uid for a nodemap. The squash_uid is the uid
 886  * that the all client uids are mapped to if nodemap is active,
 887  * the trust_client_ids flag is not set, and the uid is not in
 888  * the idmap tree.
 889  */
 890 int nodemap_set_squash_uid(const char *name, uid_t uid)
 891 {
 892         struct lu_nodemap       *nodemap = NULL;
 893         int                     rc = 0;
 894
 895         rc = nodemap_lookup(name, &nodemap);
 896         if (nodemap == NULL)
 897                 GOTO(out, rc = -ENOENT);
 898
 899         nodemap->nm_squash_uid = uid;
 900         nm_member_revoke_locks(nodemap);
 901         nodemap_putref(nodemap);
 902 out:
 903         return rc;
 904 }
 905 EXPORT_SYMBOL(nodemap_set_squash_uid);
 906
 907 /**
 908  * Update the squash_gid for a nodemap.
 909  *
 910  * \param       name            nodemap name
 911  * \param       gid_string      string containing new squash_gid value
 912  * \retval      0 on success
 913  *
 914  * Update the squash_gid for a nodemap. The squash_uid is the gid
 915  * that the all client gids are mapped to if nodemap is active,
 916  * the trust_client_ids flag is not set, and the gid is not in
 917  * the idmap tree.
 918  */
 919 int nodemap_set_squash_gid(const char *name, gid_t gid)
 920 {
 921         struct lu_nodemap       *nodemap = NULL;
 922         int                     rc = 0;
 923
 924         rc = nodemap_lookup(name, &nodemap);
 925         if (nodemap == NULL)
 926                 GOTO(out, rc = -ENOENT);
 927
 928         nodemap->nm_squash_gid = gid;
 929         nm_member_revoke_locks(nodemap);
 930         nodemap_putref(nodemap);
 931 out:
 932         return rc;
 933 }
 934 EXPORT_SYMBOL(nodemap_set_squash_gid);
 935
 936 /**
 937  * Returns true if this nodemap has root user access. Always returns true if
 938  * nodemaps are not active.
 939  *
 940  * \param       nodemap         nodemap to check access for
 941  */
 942 bool nodemap_can_setquota(const struct lu_nodemap *nodemap)
 943 {
 944         return !nodemap_active || nodemap->nmf_allow_root_access;
 945 }
 946 EXPORT_SYMBOL(nodemap_can_setquota);
 947
 948 /**
 949  * Add a nodemap
 950  *
 951  * \param       name            name of nodemap
 952  * \retval      0               success
 953  * \retval      -EINVAL         invalid nodemap name
 954  * \retval      -EEXIST         nodemap already exists
 955  * \retval      -ENOMEM         cannot allocate memory for nodemap
 956  */
 957 int nodemap_add(const char *nodemap_name)
 958 {
 959         return nodemap_create(nodemap_name, 0);
 960 }
 961 EXPORT_SYMBOL(nodemap_add);
 962
 963 /**
 964  * Delete a nodemap
 965  *
 966  * \param       name            name of nodemmap
 967  * \retval      0               success
 968  * \retval      -EINVAL         invalid input
 969  * \retval      -ENOENT         no existing nodemap
 970  */
 971 int nodemap_del(const char *nodemap_name)
 972 {
 973         struct  lu_nodemap *nodemap;
 974         int     rc = 0;
 975
 976         if (strcmp(nodemap_name, DEFAULT_NODEMAP) == 0)
 977                 GOTO(out, rc = -EINVAL);
 978
 979         nodemap = cfs_hash_del_key(nodemap_hash, nodemap_name);
 980         if (nodemap == NULL)
 981                 GOTO(out, rc = -ENOENT);
 982
 983         /*
 984          * remove procfs here in case nodemap_create called with same name
 985          * before nodemap_destory is run.
 986          */
 987         lprocfs_remove(&nodemap->nm_proc_entry);
 988         nodemap_putref(nodemap);
 989 out:
 990         return rc;
 991 }
 992 EXPORT_SYMBOL(nodemap_del);
 993
 994 /**
 995  * activate nodemap functions
 996  *
 997  * \param       value           1 for on, 0 for off
 998  */
 999 void nodemap_activate(const bool value)
1000 {
1001         nodemap_active = value;
1002         nm_member_revoke_all();
1003 }
1004 EXPORT_SYMBOL(nodemap_activate);
1005
1006 /**
1007  * Cleanup nodemap module on exit
1008  */
1009 void nodemap_mod_exit(void)
1010 {
1011         nodemap_cleanup_all();
1012         lprocfs_remove(&proc_lustre_nodemap_root);
1013 }
1014
1015 /**
1016  * Initialize the nodemap module
1017  */
1018 int nodemap_mod_init(void)
1019 {
1020         int rc = 0;
1021
1022         rc = nodemap_init_hash();
1023         if (rc != 0)
1024                 goto cleanup;
1025
1026         rwlock_init(&nm_range_tree_lock);
1027         nodemap_procfs_init();
1028         rc = nodemap_create(DEFAULT_NODEMAP, 1);
1029
1030 cleanup:
1031         if (rc != 0)
1032                 nodemap_mod_exit();
1033
1034         return rc;
1035 }
1036
1037 static int nm_member_revoke_all_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1038                                    struct hlist_node *hnode, void *data)
1039 {
1040         struct lu_nodemap *nodemap;
1041
1042         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
1043         nm_member_revoke_locks(nodemap);
1044         return 0;
1045 }
1046
1047 /**
1048  * Revoke locks for all nodemaps.
1049  */
1050 void nm_member_revoke_all()
1051 {
1052         cfs_hash_for_each_safe(nodemap_hash, nm_member_revoke_all_cb, NULL);
1053 }
1054