lustre/ptlrpc/nodemap_storage.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) 2015, Trustees of Indiana University
  24  *
  25  * Copyright (c) 2017, Intel Corporation.
  26  *
  27  * Author: Joshua Walgenbach <jjw@iu.edu>
  28  * Author: Kit Westneat <cwestnea@iu.edu>
  29  *
  30  * Implements the storage functionality for the nodemap configuration. Functions
  31  * in this file prepare, store, and load nodemap configuration data. Targets
  32  * using nodemap services should register a configuration file object. Nodemap
  33  * configuration changes that need to persist should call the appropriate
  34  * storage function for the data being modified.
  35  *
  36  * There are several index types as defined in enum nodemap_idx_type:
  37  *      NODEMAP_CLUSTER_IDX     stores the data found on the lu_nodemap struct,
  38  *                              like root squash and config flags, as well as
  39  *                              the name.
  40  *      NODEMAP_RANGE_IDX       stores NID range information for a nodemap
  41  *      NODEMAP_UIDMAP_IDX      stores a fs/client UID mapping pair
  42  *      NODEMAP_GIDMAP_IDX      stores a fs/client GID mapping pair
  43  *      NODEMAP_GLOBAL_IDX      stores whether or not nodemaps are active
  44  */
  45
  46 #include <libcfs/libcfs.h>
  47 #include <linux/err.h>
  48 #include <linux/kernel.h>
  49 #include <linux/list.h>
  50 #include <linux/mutex.h>
  51 #include <linux/string.h>
  52 #include <linux/types.h>
  53 #include <uapi/linux/lnet/lnet-types.h>
  54 #include <uapi/linux/lustre/lustre_idl.h>
  55 #include <dt_object.h>
  56 #include <lu_object.h>
  57 #include <lustre_net.h>
  58 #include <lustre_nodemap.h>
  59 #include <obd_class.h>
  60 #include <obd_support.h>
  61 #include "nodemap_internal.h"
  62
  63 /* list of registered nodemap index files, except MGS */
  64 static LIST_HEAD(ncf_list_head);
  65 static DEFINE_MUTEX(ncf_list_lock);
  66
  67 /* MGS index is different than others, others are listeners to MGS idx */
  68 static struct nm_config_file *nodemap_mgs_ncf;
  69
  70 /* lu_nodemap flags */
  71 enum nm_flag_shifts {
  72         NM_FL_ALLOW_ROOT_ACCESS = 0x1,
  73         NM_FL_TRUST_CLIENT_IDS = 0x2,
  74         NM_FL_DENY_UNKNOWN = 0x4,
  75         NM_FL_MAP_UID_ONLY = 0x8,
  76         NM_FL_MAP_GID_ONLY = 0x10,
  77         NM_FL_ENABLE_AUDIT = 0x20,
  78 };
  79
  80 static void nodemap_cluster_key_init(struct nodemap_key *nk, unsigned int nm_id)
  81 {
  82         nk->nk_nodemap_id = cpu_to_le32(nm_idx_set_type(nm_id,
  83                                                         NODEMAP_CLUSTER_IDX));
  84         nk->nk_unused = 0;
  85 }
  86
  87 static void nodemap_cluster_rec_init(union nodemap_rec *nr,
  88                                      const struct lu_nodemap *nodemap)
  89 {
  90         BUILD_BUG_ON(sizeof(nr->ncr.ncr_name) != sizeof(nodemap->nm_name));
  91
  92         strncpy(nr->ncr.ncr_name, nodemap->nm_name, sizeof(nr->ncr.ncr_name));
  93         nr->ncr.ncr_squash_uid = cpu_to_le32(nodemap->nm_squash_uid);
  94         nr->ncr.ncr_squash_gid = cpu_to_le32(nodemap->nm_squash_gid);
  95         nr->ncr.ncr_flags = cpu_to_le32(
  96                 (nodemap->nmf_trust_client_ids ?
  97                         NM_FL_TRUST_CLIENT_IDS : 0) |
  98                 (nodemap->nmf_allow_root_access ?
  99                         NM_FL_ALLOW_ROOT_ACCESS : 0) |
 100                 (nodemap->nmf_deny_unknown ?
 101                         NM_FL_DENY_UNKNOWN : 0) |
 102                 (nodemap->nmf_map_uid_only ?
 103                         NM_FL_MAP_UID_ONLY : 0) |
 104                 (nodemap->nmf_map_gid_only ?
 105                         NM_FL_MAP_GID_ONLY : 0) |
 106                 (nodemap->nmf_enable_audit ?
 107                         NM_FL_ENABLE_AUDIT : 0));
 108 }
 109
 110 static void nodemap_idmap_key_init(struct nodemap_key *nk, unsigned int nm_id,
 111                                    enum nodemap_id_type id_type,
 112                                    u32 id_client)
 113 {
 114         enum nodemap_idx_type idx_type;
 115
 116         if (id_type == NODEMAP_UID)
 117                 idx_type = NODEMAP_UIDMAP_IDX;
 118         else
 119                 idx_type = NODEMAP_GIDMAP_IDX;
 120
 121         nk->nk_nodemap_id = cpu_to_le32(nm_idx_set_type(nm_id, idx_type));
 122         nk->nk_id_client = cpu_to_le32(id_client);
 123 }
 124
 125 static void nodemap_idmap_rec_init(union nodemap_rec *nr, u32 id_fs)
 126 {
 127         nr->nir.nir_id_fs = cpu_to_le32(id_fs);
 128 }
 129
 130 static void nodemap_range_key_init(struct nodemap_key *nk, unsigned int nm_id,
 131                                    unsigned int rn_id)
 132 {
 133         nk->nk_nodemap_id = cpu_to_le32(nm_idx_set_type(nm_id,
 134                                                         NODEMAP_RANGE_IDX));
 135         nk->nk_range_id = cpu_to_le32(rn_id);
 136 }
 137
 138 static void nodemap_range_rec_init(union nodemap_rec *nr,
 139                                    const lnet_nid_t nid[2])
 140 {
 141         nr->nrr.nrr_start_nid = cpu_to_le64(nid[0]);
 142         nr->nrr.nrr_end_nid = cpu_to_le64(nid[1]);
 143 }
 144
 145 static void nodemap_global_key_init(struct nodemap_key *nk)
 146 {
 147         nk->nk_nodemap_id = cpu_to_le32(nm_idx_set_type(0, NODEMAP_GLOBAL_IDX));
 148         nk->nk_unused = 0;
 149 }
 150
 151 static void nodemap_global_rec_init(union nodemap_rec *nr, bool active)
 152 {
 153         nr->ngr.ngr_is_active = active;
 154 }
 155
 156 /* should be called with dt_write lock */
 157 static void nodemap_inc_version(const struct lu_env *env,
 158                                 struct dt_object *nodemap_idx,
 159                                 struct thandle *th)
 160 {
 161         u64 ver = dt_version_get(env, nodemap_idx);
 162         dt_version_set(env, nodemap_idx, ver + 1, th);
 163 }
 164
 165 enum ncfc_find_create {
 166         NCFC_CREATE_NEW = 1,
 167 };
 168
 169 static struct dt_object *nodemap_cache_find_create(const struct lu_env *env,
 170                                                    struct dt_device *dev,
 171                                                    struct local_oid_storage *los,
 172                                                    enum ncfc_find_create create_new)
 173 {
 174         struct lu_fid tfid;
 175         struct dt_object *root_obj;
 176         struct dt_object *nm_obj;
 177         int rc = 0;
 178
 179         rc = dt_root_get(env, dev, &tfid);
 180         if (rc < 0)
 181                 GOTO(out, nm_obj = ERR_PTR(rc));
 182
 183         root_obj = dt_locate(env, dev, &tfid);
 184         if (unlikely(IS_ERR(root_obj)))
 185                 GOTO(out, nm_obj = root_obj);
 186
 187         rc = dt_lookup_dir(env, root_obj, LUSTRE_NODEMAP_NAME, &tfid);
 188         if (rc == -ENOENT) {
 189                 if (dev->dd_rdonly)
 190                         GOTO(out_root, nm_obj = ERR_PTR(-EROFS));
 191         } else if (rc) {
 192                 GOTO(out_root, nm_obj = ERR_PTR(rc));
 193         } else if (dev->dd_rdonly && create_new == NCFC_CREATE_NEW) {
 194                 GOTO(out_root, nm_obj = ERR_PTR(-EROFS));
 195         }
 196
 197 again:
 198         /* if loading index fails the first time, create new index */
 199         if (create_new == NCFC_CREATE_NEW && rc != -ENOENT) {
 200                 CDEBUG(D_INFO, "removing old index, creating new one\n");
 201                 rc = local_object_unlink(env, dev, root_obj,
 202                                          LUSTRE_NODEMAP_NAME);
 203                 if (rc < 0) {
 204                         /* XXX not sure the best way to get obd name. */
 205                         CERROR("cannot destroy nodemap index: rc = %d\n",
 206                                rc);
 207                         GOTO(out_root, nm_obj = ERR_PTR(rc));
 208                 }
 209         }
 210
 211         nm_obj = local_index_find_or_create(env, los, root_obj,
 212                                                 LUSTRE_NODEMAP_NAME,
 213                                                 S_IFREG | S_IRUGO | S_IWUSR,
 214                                                 &dt_nodemap_features);
 215         if (IS_ERR(nm_obj))
 216                 GOTO(out_root, nm_obj);
 217
 218         if (nm_obj->do_index_ops == NULL) {
 219                 rc = nm_obj->do_ops->do_index_try(env, nm_obj,
 220                                                       &dt_nodemap_features);
 221                 /* even if loading from tgt fails, connecting to MGS will
 222                  * rewrite the config
 223                  */
 224                 if (rc < 0) {
 225                         dt_object_put(env, nm_obj);
 226
 227                         if (create_new == NCFC_CREATE_NEW)
 228                                 GOTO(out_root, nm_obj = ERR_PTR(rc));
 229
 230                         CERROR("cannot load nodemap index from disk, creating "
 231                                "new index: rc = %d\n", rc);
 232                         create_new = NCFC_CREATE_NEW;
 233                         goto again;
 234                 }
 235         }
 236
 237 out_root:
 238         dt_object_put(env, root_obj);
 239 out:
 240         return nm_obj;
 241 }
 242
 243 static int nodemap_idx_insert(const struct lu_env *env,
 244                               struct dt_object *idx,
 245                               const struct nodemap_key *nk,
 246                               const union nodemap_rec *nr)
 247 {
 248         struct thandle *th;
 249         struct dt_device *dev = lu2dt_dev(idx->do_lu.lo_dev);
 250         int rc;
 251
 252         BUILD_BUG_ON(sizeof(union nodemap_rec) != 32);
 253
 254         th = dt_trans_create(env, dev);
 255
 256         if (IS_ERR(th))
 257                 GOTO(out, rc = PTR_ERR(th));
 258
 259         rc = dt_declare_insert(env, idx,
 260                                (const struct dt_rec *)nr,
 261                                (const struct dt_key *)nk, th);
 262         if (rc != 0)
 263                 GOTO(out, rc);
 264
 265         rc = dt_declare_version_set(env, idx, th);
 266         if (rc != 0)
 267                 GOTO(out, rc);
 268
 269         rc = dt_trans_start_local(env, dev, th);
 270         if (rc != 0)
 271                 GOTO(out, rc);
 272
 273         dt_write_lock(env, idx, 0);
 274
 275         rc = dt_insert(env, idx, (const struct dt_rec *)nr,
 276                        (const struct dt_key *)nk, th);
 277
 278         nodemap_inc_version(env, idx, th);
 279         dt_write_unlock(env, idx);
 280 out:
 281         dt_trans_stop(env, dev, th);
 282
 283         return rc;
 284 }
 285
 286 static int nodemap_idx_update(const struct lu_env *env,
 287                               struct dt_object *idx,
 288                               const struct nodemap_key *nk,
 289                               const union nodemap_rec *nr)
 290 {
 291         struct thandle          *th;
 292         struct dt_device        *dev = lu2dt_dev(idx->do_lu.lo_dev);
 293         int                      rc = 0;
 294
 295         th = dt_trans_create(env, dev);
 296
 297         if (IS_ERR(th))
 298                 GOTO(out, rc = PTR_ERR(th));
 299
 300         rc = dt_declare_delete(env, idx, (const struct dt_key *)nk, th);
 301         if (rc != 0)
 302                 GOTO(out, rc);
 303
 304         rc = dt_declare_insert(env, idx, (const struct dt_rec *)nr,
 305                                (const struct dt_key *)nk, th);
 306         if (rc != 0)
 307                 GOTO(out, rc);
 308
 309         rc = dt_declare_version_set(env, idx, th);
 310         if (rc != 0)
 311                 GOTO(out, rc);
 312
 313         rc = dt_trans_start_local(env, dev, th);
 314         if (rc != 0)
 315                 GOTO(out, rc);
 316
 317         dt_write_lock(env, idx, 0);
 318
 319         rc = dt_delete(env, idx, (const struct dt_key *)nk, th);
 320         if (rc != 0)
 321                 GOTO(out_lock, rc);
 322
 323         rc = dt_insert(env, idx, (const struct dt_rec *)nr,
 324                        (const struct dt_key *)nk, th);
 325         if (rc != 0)
 326                 GOTO(out_lock, rc);
 327
 328         nodemap_inc_version(env, idx, th);
 329 out_lock:
 330         dt_write_unlock(env, idx);
 331 out:
 332         dt_trans_stop(env, dev, th);
 333
 334         return rc;
 335 }
 336
 337 static int nodemap_idx_delete(const struct lu_env *env,
 338                               struct dt_object *idx,
 339                               const struct nodemap_key *nk,
 340                               const union nodemap_rec *unused)
 341 {
 342         struct thandle          *th;
 343         struct dt_device        *dev = lu2dt_dev(idx->do_lu.lo_dev);
 344         int                      rc = 0;
 345
 346         th = dt_trans_create(env, dev);
 347
 348         if (IS_ERR(th))
 349                 GOTO(out, rc = PTR_ERR(th));
 350
 351         rc = dt_declare_delete(env, idx, (const struct dt_key *)nk, th);
 352         if (rc != 0)
 353                 GOTO(out, rc);
 354
 355         rc = dt_declare_version_set(env, idx, th);
 356         if (rc != 0)
 357                 GOTO(out, rc);
 358
 359         rc = dt_trans_start_local(env, dev, th);
 360         if (rc != 0)
 361                 GOTO(out, rc);
 362
 363         dt_write_lock(env, idx, 0);
 364
 365         rc = dt_delete(env, idx, (const struct dt_key *)nk, th);
 366
 367         nodemap_inc_version(env, idx, th);
 368
 369         dt_write_unlock(env, idx);
 370 out:
 371         dt_trans_stop(env, dev, th);
 372
 373         return rc;
 374 }
 375
 376 enum nm_add_update {
 377         NM_ADD = 0,
 378         NM_UPDATE = 1,
 379 };
 380
 381 static int nodemap_idx_nodemap_add_update(const struct lu_nodemap *nodemap,
 382                                           struct dt_object *idx,
 383                                           enum nm_add_update update)
 384 {
 385         struct nodemap_key nk;
 386         union nodemap_rec nr;
 387         struct lu_env env;
 388         int rc = 0;
 389
 390         ENTRY;
 391
 392         rc = lu_env_init(&env, LCT_LOCAL);
 393         if (rc)
 394                 RETURN(rc);
 395
 396         nodemap_cluster_key_init(&nk, nodemap->nm_id);
 397         nodemap_cluster_rec_init(&nr, nodemap);
 398
 399         if (update == NM_UPDATE)
 400                 rc = nodemap_idx_update(&env, idx, &nk, &nr);
 401         else
 402                 rc = nodemap_idx_insert(&env, idx, &nk, &nr);
 403
 404         lu_env_fini(&env);
 405
 406         RETURN(rc);
 407 }
 408
 409 int nodemap_idx_nodemap_add(const struct lu_nodemap *nodemap)
 410 {
 411         if (nodemap_mgs_ncf == NULL) {
 412                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 413                 return -EINVAL;
 414         }
 415
 416         return nodemap_idx_nodemap_add_update(nodemap, nodemap_mgs_ncf->ncf_obj,
 417                                               NM_ADD);
 418 }
 419
 420 int nodemap_idx_nodemap_update(const struct lu_nodemap *nodemap)
 421 {
 422         if (nodemap_mgs_ncf == NULL) {
 423                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 424                 return -EINVAL;
 425         }
 426
 427         return nodemap_idx_nodemap_add_update(nodemap, nodemap_mgs_ncf->ncf_obj,
 428                                               NM_UPDATE);
 429 }
 430
 431 int nodemap_idx_nodemap_del(const struct lu_nodemap *nodemap)
 432 {
 433         struct rb_root           root;
 434         struct lu_idmap         *idmap;
 435         struct lu_idmap         *temp;
 436         struct lu_nid_range     *range;
 437         struct lu_nid_range     *range_temp;
 438         struct nodemap_key       nk;
 439         struct lu_env            env;
 440         int                      rc = 0;
 441         int                      rc2 = 0;
 442
 443         ENTRY;
 444
 445         if (nodemap_mgs_ncf == NULL) {
 446                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 447                 return -EINVAL;
 448         }
 449
 450         rc = lu_env_init(&env, LCT_LOCAL);
 451         if (rc != 0)
 452                 RETURN(rc);
 453
 454         root = nodemap->nm_fs_to_client_uidmap;
 455         nm_rbtree_postorder_for_each_entry_safe(idmap, temp, &root,
 456                                                 id_fs_to_client) {
 457                 nodemap_idmap_key_init(&nk, nodemap->nm_id, NODEMAP_UID,
 458                                        idmap->id_client);
 459                 rc2 = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj,
 460                                          &nk, NULL);
 461                 if (rc2 < 0)
 462                         rc = rc2;
 463         }
 464
 465         root = nodemap->nm_client_to_fs_gidmap;
 466         nm_rbtree_postorder_for_each_entry_safe(idmap, temp, &root,
 467                                                 id_client_to_fs) {
 468                 nodemap_idmap_key_init(&nk, nodemap->nm_id, NODEMAP_GID,
 469                                        idmap->id_client);
 470                 rc2 = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj,
 471                                          &nk, NULL);
 472                 if (rc2 < 0)
 473                         rc = rc2;
 474         }
 475
 476         list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
 477                                  rn_list) {
 478                 nodemap_range_key_init(&nk, nodemap->nm_id, range->rn_id);
 479                 rc2 = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj,
 480                                          &nk, NULL);
 481                 if (rc2 < 0)
 482                         rc = rc2;
 483         }
 484
 485         nodemap_cluster_key_init(&nk, nodemap->nm_id);
 486         rc2 = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj, &nk, NULL);
 487         if (rc2 < 0)
 488                 rc = rc2;
 489
 490         lu_env_fini(&env);
 491
 492         RETURN(rc);
 493 }
 494
 495 int nodemap_idx_range_add(const struct lu_nid_range *range,
 496                           const lnet_nid_t nid[2])
 497 {
 498         struct nodemap_key       nk;
 499         union nodemap_rec        nr;
 500         struct lu_env            env;
 501         int                      rc = 0;
 502         ENTRY;
 503
 504         if (nodemap_mgs_ncf == NULL) {
 505                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 506                 return -EINVAL;
 507         }
 508
 509         rc = lu_env_init(&env, LCT_LOCAL);
 510         if (rc != 0)
 511                 RETURN(rc);
 512
 513         nodemap_range_key_init(&nk, range->rn_nodemap->nm_id, range->rn_id);
 514         nodemap_range_rec_init(&nr, nid);
 515
 516         rc = nodemap_idx_insert(&env, nodemap_mgs_ncf->ncf_obj, &nk, &nr);
 517         lu_env_fini(&env);
 518
 519         RETURN(rc);
 520 }
 521
 522 int nodemap_idx_range_del(const struct lu_nid_range *range)
 523 {
 524         struct nodemap_key       nk;
 525         struct lu_env            env;
 526         int                      rc = 0;
 527         ENTRY;
 528
 529         if (nodemap_mgs_ncf == NULL) {
 530                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 531                 return -EINVAL;
 532         }
 533
 534         rc = lu_env_init(&env, LCT_LOCAL);
 535         if (rc != 0)
 536                 RETURN(rc);
 537
 538         nodemap_range_key_init(&nk, range->rn_nodemap->nm_id, range->rn_id);
 539
 540         rc = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj, &nk, NULL);
 541         lu_env_fini(&env);
 542
 543         RETURN(rc);
 544 }
 545
 546 int nodemap_idx_idmap_add(const struct lu_nodemap *nodemap,
 547                           enum nodemap_id_type id_type,
 548                           const u32 map[2])
 549 {
 550         struct nodemap_key       nk;
 551         union nodemap_rec        nr;
 552         struct lu_env            env;
 553         int                      rc = 0;
 554         ENTRY;
 555
 556         if (nodemap_mgs_ncf == NULL) {
 557                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 558                 return -EINVAL;
 559         }
 560
 561         rc = lu_env_init(&env, LCT_LOCAL);
 562         if (rc != 0)
 563                 RETURN(rc);
 564
 565         nodemap_idmap_key_init(&nk, nodemap->nm_id, id_type, map[0]);
 566         nodemap_idmap_rec_init(&nr, map[1]);
 567
 568         rc = nodemap_idx_insert(&env, nodemap_mgs_ncf->ncf_obj, &nk, &nr);
 569         lu_env_fini(&env);
 570
 571         RETURN(rc);
 572 }
 573
 574 int nodemap_idx_idmap_del(const struct lu_nodemap *nodemap,
 575                           enum nodemap_id_type id_type,
 576                           const u32 map[2])
 577 {
 578         struct nodemap_key       nk;
 579         struct lu_env            env;
 580         int                      rc = 0;
 581         ENTRY;
 582
 583         if (nodemap_mgs_ncf == NULL) {
 584                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 585                 return -EINVAL;
 586         }
 587
 588         rc = lu_env_init(&env, LCT_LOCAL);
 589         if (rc != 0)
 590                 RETURN(rc);
 591
 592         nodemap_idmap_key_init(&nk, nodemap->nm_id, id_type, map[0]);
 593
 594         rc = nodemap_idx_delete(&env, nodemap_mgs_ncf->ncf_obj, &nk, NULL);
 595         lu_env_fini(&env);
 596
 597         RETURN(rc);
 598 }
 599
 600 static int nodemap_idx_global_add_update(bool value, enum nm_add_update update)
 601 {
 602         struct nodemap_key       nk;
 603         union nodemap_rec        nr;
 604         struct lu_env            env;
 605         int                      rc = 0;
 606         ENTRY;
 607
 608         if (nodemap_mgs_ncf == NULL) {
 609                 CERROR("cannot add nodemap config to non-existing MGS.\n");
 610                 return -EINVAL;
 611         }
 612
 613         rc = lu_env_init(&env, LCT_LOCAL);
 614         if (rc != 0)
 615                 RETURN(rc);
 616
 617         nodemap_global_key_init(&nk);
 618         nodemap_global_rec_init(&nr, value);
 619
 620         if (update == NM_UPDATE)
 621                 rc = nodemap_idx_update(&env, nodemap_mgs_ncf->ncf_obj,
 622                                         &nk, &nr);
 623         else
 624                 rc = nodemap_idx_insert(&env, nodemap_mgs_ncf->ncf_obj,
 625                                         &nk, &nr);
 626
 627         lu_env_fini(&env);
 628
 629         RETURN(rc);
 630 }
 631
 632 int nodemap_idx_nodemap_activate(bool value)
 633 {
 634         return nodemap_idx_global_add_update(value, NM_UPDATE);
 635 }
 636
 637 static enum nodemap_idx_type nodemap_get_key_type(const struct nodemap_key *key)
 638 {
 639         u32                      nodemap_id;
 640
 641         nodemap_id = le32_to_cpu(key->nk_nodemap_id);
 642         return nm_idx_get_type(nodemap_id);
 643 }
 644
 645 /**
 646  * Process a key/rec pair and modify the new configuration.
 647  *
 648  * \param       config          configuration to update with this key/rec data
 649  * \param       key             key of the record that was loaded
 650  * \param       rec             record that was loaded
 651  * \param       recent_nodemap  last referenced nodemap
 652  * \retval      type of record processed, see enum #nodemap_idx_type
 653  * \retval      -ENOENT         range or map loaded before nodemap record
 654  * \retval      -EINVAL         duplicate nodemap cluster records found with
 655  *                              different IDs, or nodemap has invalid name
 656  * \retval      -ENOMEM
 657  */
 658 static int nodemap_process_keyrec(struct nodemap_config *config,
 659                                   const struct nodemap_key *key,
 660                                   const union nodemap_rec *rec,
 661                                   struct lu_nodemap **recent_nodemap)
 662 {
 663         struct lu_nodemap *nodemap = NULL;
 664         enum nodemap_idx_type type;
 665         enum nodemap_id_type id_type;
 666         u8 flags;
 667         u32 nodemap_id;
 668         lnet_nid_t nid[2];
 669         u32 map[2];
 670         int rc;
 671
 672         ENTRY;
 673
 674         BUILD_BUG_ON(sizeof(union nodemap_rec) != 32);
 675
 676         nodemap_id = le32_to_cpu(key->nk_nodemap_id);
 677         type = nodemap_get_key_type(key);
 678         nodemap_id = nm_idx_set_type(nodemap_id, 0);
 679
 680         CDEBUG(D_INFO, "found config entry, nm_id %d type %d\n",
 681                nodemap_id, type);
 682
 683         /* find the correct nodemap in the load list */
 684         if (type == NODEMAP_RANGE_IDX || type == NODEMAP_UIDMAP_IDX ||
 685             type == NODEMAP_GIDMAP_IDX) {
 686                 struct lu_nodemap *tmp = NULL;
 687
 688                 nodemap = *recent_nodemap;
 689
 690                 if (nodemap == NULL)
 691                         GOTO(out, rc = -ENOENT);
 692
 693                 if (nodemap->nm_id != nodemap_id) {
 694                         list_for_each_entry(tmp, &nodemap->nm_list, nm_list)
 695                                 if (tmp->nm_id == nodemap_id) {
 696                                         nodemap = tmp;
 697                                         break;
 698                                 }
 699
 700                         if (nodemap->nm_id != nodemap_id)
 701                                 GOTO(out, rc = -ENOENT);
 702                 }
 703
 704                 /* update most recently used nodemap if necessay */
 705                 if (nodemap != *recent_nodemap)
 706                         *recent_nodemap = nodemap;
 707         }
 708
 709         switch (type) {
 710         case NODEMAP_EMPTY_IDX:
 711                 if (nodemap_id != 0)
 712                         CWARN("Found nodemap config record without type field, "
 713                               " nodemap_id=%d. nodemap config file corrupt?\n",
 714                               nodemap_id);
 715                 break;
 716         case NODEMAP_CLUSTER_IDX: {
 717                 struct lu_nodemap *old_nm = NULL;
 718
 719                 nodemap = cfs_hash_lookup(config->nmc_nodemap_hash,
 720                                           rec->ncr.ncr_name);
 721                 if (nodemap == NULL) {
 722                         if (nodemap_id == LUSTRE_NODEMAP_DEFAULT_ID) {
 723                                 nodemap = nodemap_create(rec->ncr.ncr_name,
 724                                                          config, 1);
 725                         } else {
 726                                 nodemap = nodemap_create(rec->ncr.ncr_name,
 727                                                          config, 0);
 728                         }
 729                         if (IS_ERR(nodemap))
 730                                 GOTO(out, rc = PTR_ERR(nodemap));
 731
 732                         /* we need to override the local ID with the saved ID */
 733                         nodemap->nm_id = nodemap_id;
 734                         if (nodemap_id > config->nmc_nodemap_highest_id)
 735                                 config->nmc_nodemap_highest_id = nodemap_id;
 736
 737                 } else if (nodemap->nm_id != nodemap_id) {
 738                         nodemap_putref(nodemap);
 739                         GOTO(out, rc = -EINVAL);
 740                 }
 741
 742                 nodemap->nm_squash_uid =
 743                                 le32_to_cpu(rec->ncr.ncr_squash_uid);
 744                 nodemap->nm_squash_gid =
 745                                 le32_to_cpu(rec->ncr.ncr_squash_gid);
 746
 747                 flags = le32_to_cpu(rec->ncr.ncr_flags);
 748                 nodemap->nmf_allow_root_access =
 749                                         flags & NM_FL_ALLOW_ROOT_ACCESS;
 750                 nodemap->nmf_trust_client_ids =
 751                                         flags & NM_FL_TRUST_CLIENT_IDS;
 752                 nodemap->nmf_deny_unknown =
 753                                         flags & NM_FL_DENY_UNKNOWN;
 754                 nodemap->nmf_map_uid_only =
 755                                         flags & NM_FL_MAP_UID_ONLY;
 756                 nodemap->nmf_map_gid_only =
 757                                         flags & NM_FL_MAP_GID_ONLY;
 758                 nodemap->nmf_enable_audit =
 759                                         flags & NM_FL_ENABLE_AUDIT;
 760
 761                 /* The fileset should be saved otherwise it will be empty
 762                  * every time in case of "NODEMAP_CLUSTER_IDX". */
 763                 mutex_lock(&active_config_lock);
 764                 old_nm = nodemap_lookup(rec->ncr.ncr_name);
 765                 if (!IS_ERR(old_nm) && old_nm->nm_fileset[0] != '\0')
 766                         strlcpy(nodemap->nm_fileset, old_nm->nm_fileset,
 767                                 sizeof(nodemap->nm_fileset));
 768                 mutex_unlock(&active_config_lock);
 769                 if (!IS_ERR(old_nm))
 770                         nodemap_putref(old_nm);
 771
 772                 if (*recent_nodemap == NULL) {
 773                         *recent_nodemap = nodemap;
 774                         INIT_LIST_HEAD(&nodemap->nm_list);
 775                 } else {
 776                         list_add(&nodemap->nm_list,
 777                                  &(*recent_nodemap)->nm_list);
 778                 }
 779                 nodemap_putref(nodemap);
 780                 break;
 781         }
 782         case NODEMAP_RANGE_IDX:
 783                 nid[0] = le64_to_cpu(rec->nrr.nrr_start_nid);
 784                 nid[1] = le64_to_cpu(rec->nrr.nrr_end_nid);
 785
 786                 rc = nodemap_add_range_helper(config, nodemap, nid,
 787                                         le32_to_cpu(key->nk_range_id));
 788                 if (rc != 0)
 789                         GOTO(out, rc);
 790                 break;
 791         case NODEMAP_UIDMAP_IDX:
 792         case NODEMAP_GIDMAP_IDX:
 793                 map[0] = le32_to_cpu(key->nk_id_client);
 794                 map[1] = le32_to_cpu(rec->nir.nir_id_fs);
 795
 796                 if (type == NODEMAP_UIDMAP_IDX)
 797                         id_type = NODEMAP_UID;
 798                 else
 799                         id_type = NODEMAP_GID;
 800
 801                 rc = nodemap_add_idmap_helper(nodemap, id_type, map);
 802                 if (rc != 0)
 803                         GOTO(out, rc);
 804                 break;
 805         case NODEMAP_GLOBAL_IDX:
 806                 config->nmc_nodemap_is_active = rec->ngr.ngr_is_active;
 807                 break;
 808         default:
 809                 CERROR("got keyrec pair for unknown type %d\n", type);
 810                 break;
 811         }
 812
 813         rc = type;
 814
 815         EXIT;
 816
 817 out:
 818         return rc;
 819 }
 820
 821 enum nm_config_passes {
 822         NM_READ_CLUSTERS = 0,
 823         NM_READ_ATTRIBUTES = 1,
 824 };
 825
 826 static int nodemap_load_entries(const struct lu_env *env,
 827                                 struct dt_object *nodemap_idx)
 828 {
 829         const struct dt_it_ops *iops;
 830         struct dt_it *it;
 831         struct lu_nodemap *recent_nodemap = NULL;
 832         struct nodemap_config *new_config = NULL;
 833         u64 hash = 0;
 834         bool activate_nodemap = false;
 835         bool loaded_global_idx = false;
 836         enum nm_config_passes cur_pass = NM_READ_CLUSTERS;
 837         int rc = 0;
 838
 839         ENTRY;
 840
 841         iops = &nodemap_idx->do_index_ops->dio_it;
 842
 843         dt_read_lock(env, nodemap_idx, 0);
 844         it = iops->init(env, nodemap_idx, 0);
 845         if (IS_ERR(it))
 846                 GOTO(out, rc = PTR_ERR(it));
 847
 848         rc = iops->load(env, it, hash);
 849         if (rc < 0)
 850                 GOTO(out_iops_fini, rc);
 851
 852         /* rc == 0 means we need to advance to record */
 853         if (rc == 0) {
 854                 rc = iops->next(env, it);
 855
 856                 if (rc < 0)
 857                         GOTO(out_iops_put, rc);
 858                 /* rc > 0 is eof, will be checked in while below */
 859         } else {
 860                 /* rc == 1, we found initial record and can process below */
 861                 rc = 0;
 862         }
 863
 864         new_config = nodemap_config_alloc();
 865         if (IS_ERR(new_config)) {
 866                 rc = PTR_ERR(new_config);
 867                 new_config = NULL;
 868                 GOTO(out_iops_put, rc);
 869         }
 870
 871         /* rc > 0 is eof, check initial iops->next here as well */
 872         while (rc == 0) {
 873                 struct nodemap_key *key;
 874                 union nodemap_rec rec;
 875                 enum nodemap_idx_type key_type;
 876
 877                 key = (struct nodemap_key *)iops->key(env, it);
 878                 key_type = nodemap_get_key_type((struct nodemap_key *)key);
 879                 if ((cur_pass == NM_READ_CLUSTERS &&
 880                                 key_type == NODEMAP_CLUSTER_IDX) ||
 881                     (cur_pass == NM_READ_ATTRIBUTES &&
 882                                 key_type != NODEMAP_CLUSTER_IDX &&
 883                                 key_type != NODEMAP_EMPTY_IDX)) {
 884                         rc = iops->rec(env, it, (struct dt_rec *)&rec, 0);
 885                         if (rc != -ESTALE) {
 886                                 if (rc != 0)
 887                                         GOTO(out_nodemap_config, rc);
 888                                 rc = nodemap_process_keyrec(new_config, key, &rec,
 889                                                             &recent_nodemap);
 890                                 if (rc < 0)
 891                                         GOTO(out_nodemap_config, rc);
 892                                 if (rc == NODEMAP_GLOBAL_IDX)
 893                                         loaded_global_idx = true;
 894                         }
 895                 }
 896
 897                 do
 898                         rc = iops->next(env, it);
 899                 while (rc == -ESTALE);
 900
 901                 /* move to second pass */
 902                 if (rc > 0 && cur_pass == NM_READ_CLUSTERS) {
 903                         cur_pass = NM_READ_ATTRIBUTES;
 904                         rc = iops->load(env, it, 0);
 905                         if (rc == 0)
 906                                 rc = iops->next(env, it);
 907                         else if (rc > 0)
 908                                 rc = 0;
 909                         else
 910                                 GOTO(out, rc);
 911                 }
 912         }
 913
 914         if (rc > 0)
 915                 rc = 0;
 916
 917 out_nodemap_config:
 918         if (rc != 0)
 919                 nodemap_config_dealloc(new_config);
 920         else
 921                 /* creating new default needs to be done outside dt read lock */
 922                 activate_nodemap = true;
 923 out_iops_put:
 924         iops->put(env, it);
 925 out_iops_fini:
 926         iops->fini(env, it);
 927 out:
 928         dt_read_unlock(env, nodemap_idx);
 929
 930         if (rc != 0)
 931                 CWARN("%s: failed to load nodemap configuration: rc = %d\n",
 932                       nodemap_idx->do_lu.lo_dev->ld_obd->obd_name, rc);
 933
 934         if (!activate_nodemap)
 935                 RETURN(rc);
 936
 937         if (new_config->nmc_default_nodemap == NULL) {
 938                 /* new MGS won't have a default nm on disk, so create it here */
 939                 struct lu_nodemap *nodemap =
 940                         nodemap_create(DEFAULT_NODEMAP, new_config, 1);
 941                 if (IS_ERR(nodemap)) {
 942                         rc = PTR_ERR(nodemap);
 943                 } else {
 944                         rc = nodemap_idx_nodemap_add_update(
 945                                         new_config->nmc_default_nodemap,
 946                                         nodemap_idx,
 947                                         NM_ADD);
 948                         nodemap_putref(new_config->nmc_default_nodemap);
 949                 }
 950         }
 951
 952         /* new nodemap config won't have an active/inactive record */
 953         if (rc == 0 && loaded_global_idx == false) {
 954                 struct nodemap_key       nk;
 955                 union nodemap_rec        nr;
 956
 957                 nodemap_global_key_init(&nk);
 958                 nodemap_global_rec_init(&nr, false);
 959                 rc = nodemap_idx_insert(env, nodemap_idx, &nk, &nr);
 960         }
 961
 962         if (rc == 0)
 963                 nodemap_config_set_active(new_config);
 964         else
 965                 nodemap_config_dealloc(new_config);
 966
 967         RETURN(rc);
 968 }
 969
 970 /**
 971  * Step through active config and write to disk.
 972  */
 973 struct dt_object *nodemap_save_config_cache(const struct lu_env *env,
 974                                             struct dt_device *dev,
 975                                             struct local_oid_storage *los)
 976 {
 977         struct dt_object *o;
 978         struct lu_nodemap *nodemap;
 979         struct lu_nodemap *nm_tmp;
 980         struct lu_nid_range *range;
 981         struct lu_nid_range *range_temp;
 982         struct lu_idmap *idmap;
 983         struct lu_idmap *id_tmp;
 984         struct rb_root root;
 985         struct nodemap_key nk;
 986         union nodemap_rec nr;
 987         LIST_HEAD(nodemap_list_head);
 988         int rc = 0, rc2;
 989
 990         ENTRY;
 991
 992         /* create a new index file to fill with active config */
 993         o = nodemap_cache_find_create(env, dev, los, NCFC_CREATE_NEW);
 994         if (IS_ERR(o))
 995                 RETURN(o);
 996
 997         mutex_lock(&active_config_lock);
 998
 999         /* convert hash to list so we don't spin */
1000         cfs_hash_for_each_safe(active_config->nmc_nodemap_hash,
1001                                nm_hash_list_cb, &nodemap_list_head);
1002
1003         list_for_each_entry_safe(nodemap, nm_tmp, &nodemap_list_head, nm_list) {
1004                 nodemap_cluster_key_init(&nk, nodemap->nm_id);
1005                 nodemap_cluster_rec_init(&nr, nodemap);
1006
1007                 rc2 = nodemap_idx_insert(env, o, &nk, &nr);
1008                 if (rc2 < 0) {
1009                         rc = rc2;
1010                         continue;
1011                 }
1012
1013                 down_read(&active_config->nmc_range_tree_lock);
1014                 list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
1015                                          rn_list) {
1016                         lnet_nid_t nid[2] = {
1017                                 range->rn_node.in_extent.start,
1018                                 range->rn_node.in_extent.end
1019                         };
1020                         nodemap_range_key_init(&nk, nodemap->nm_id,
1021                                                range->rn_id);
1022                         nodemap_range_rec_init(&nr, nid);
1023                         rc2 = nodemap_idx_insert(env, o, &nk, &nr);
1024                         if (rc2 < 0)
1025                                 rc = rc2;
1026                 }
1027                 up_read(&active_config->nmc_range_tree_lock);
1028
1029                 /* we don't need to take nm_idmap_lock because active config
1030                  * lock prevents changes from happening to nodemaps
1031                  */
1032                 root = nodemap->nm_client_to_fs_uidmap;
1033                 nm_rbtree_postorder_for_each_entry_safe(idmap, id_tmp, &root,
1034                                                         id_client_to_fs) {
1035                         nodemap_idmap_key_init(&nk, nodemap->nm_id, NODEMAP_UID,
1036                                                idmap->id_client);
1037                         nodemap_idmap_rec_init(&nr, idmap->id_fs);
1038                         rc2 = nodemap_idx_insert(env, o, &nk, &nr);
1039                         if (rc2 < 0)
1040                                 rc = rc2;
1041                 }
1042
1043                 root = nodemap->nm_client_to_fs_gidmap;
1044                 nm_rbtree_postorder_for_each_entry_safe(idmap, id_tmp, &root,
1045                                                         id_client_to_fs) {
1046                         nodemap_idmap_key_init(&nk, nodemap->nm_id, NODEMAP_GID,
1047                                                idmap->id_client);
1048                         nodemap_idmap_rec_init(&nr, idmap->id_fs);
1049                         rc2 = nodemap_idx_insert(env, o, &nk, &nr);
1050                         if (rc2 < 0)
1051                                 rc = rc2;
1052                 }
1053         }
1054         nodemap_global_key_init(&nk);
1055         nodemap_global_rec_init(&nr, active_config->nmc_nodemap_is_active);
1056         rc2 = nodemap_idx_insert(env, o, &nk, &nr);
1057         if (rc2 < 0)
1058                 rc = rc2;
1059
1060         mutex_unlock(&active_config_lock);
1061
1062         if (rc < 0) {
1063                 dt_object_put(env, o);
1064                 o = ERR_PTR(rc);
1065         }
1066
1067         RETURN(o);
1068 }
1069
1070 static void nodemap_save_all_caches(void)
1071 {
1072         struct nm_config_file   *ncf;
1073         struct lu_env            env;
1074         int                      rc = 0;
1075
1076         /* recreating nodemap cache requires fld_thread_key be in env */
1077         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD | LCT_MG_THREAD);
1078         if (rc != 0) {
1079                 CWARN("cannot init env for nodemap config: rc = %d\n", rc);
1080                 return;
1081         }
1082
1083         mutex_lock(&ncf_list_lock);
1084         list_for_each_entry(ncf, &ncf_list_head, ncf_list) {
1085                 struct dt_device *dev = lu2dt_dev(ncf->ncf_obj->do_lu.lo_dev);
1086                 struct obd_device *obd = ncf->ncf_obj->do_lu.lo_dev->ld_obd;
1087                 struct dt_object *o;
1088
1089                 /* put current config file so save conf can rewrite it */
1090                 dt_object_put_nocache(&env, ncf->ncf_obj);
1091                 ncf->ncf_obj = NULL;
1092
1093                 o = nodemap_save_config_cache(&env, dev, ncf->ncf_los);
1094                 if (IS_ERR(o))
1095                         CWARN("%s: error writing to nodemap config: rc = %d\n",
1096                               obd->obd_name, rc);
1097                 else
1098                         ncf->ncf_obj = o;
1099         }
1100         mutex_unlock(&ncf_list_lock);
1101
1102         lu_env_fini(&env);
1103 }
1104
1105 /* tracks if config still needs to be loaded, either from disk or network */
1106 static bool nodemap_config_loaded;
1107 static DEFINE_MUTEX(nodemap_config_loaded_lock);
1108
1109 /**
1110  * Ensures that configs loaded over the wire are prioritized over those loaded
1111  * from disk.
1112  *
1113  * \param config        config to set as the active config
1114  */
1115 void nodemap_config_set_active_mgc(struct nodemap_config *config)
1116 {
1117         mutex_lock(&nodemap_config_loaded_lock);
1118         nodemap_config_set_active(config);
1119         nodemap_config_loaded = true;
1120         nodemap_save_all_caches();
1121         mutex_unlock(&nodemap_config_loaded_lock);
1122 }
1123 EXPORT_SYMBOL(nodemap_config_set_active_mgc);
1124
1125 /**
1126  * Register a dt_object representing the config index file. This should be
1127  * called by targets in order to load the nodemap configuration from disk. The
1128  * dt_object should be created with local_index_find_or_create and the index
1129  * features should be enabled with do_index_try.
1130  *
1131  * \param obj   dt_object returned by local_index_find_or_create
1132  *
1133  * \retval      on success: nm_config_file handle for later deregistration
1134  * \retval      -ENOMEM         memory allocation failure
1135  * \retval      -ENOENT         error loading nodemap config
1136  * \retval      -EINVAL         error loading nodemap config
1137  * \retval      -EEXIST         nodemap config already registered for MGS
1138  */
1139 struct nm_config_file *nm_config_file_register_mgs(const struct lu_env *env,
1140                                                    struct dt_object *obj,
1141                                                    struct local_oid_storage *los)
1142 {
1143         struct nm_config_file *ncf;
1144         int rc = 0;
1145         ENTRY;
1146
1147         if (nodemap_mgs_ncf != NULL)
1148                 GOTO(out, ncf = ERR_PTR(-EEXIST));
1149
1150         OBD_ALLOC_PTR(ncf);
1151         if (ncf == NULL)
1152                 GOTO(out, ncf = ERR_PTR(-ENOMEM));
1153
1154         /* if loading from cache, prevent activation of MGS config until cache
1155          * loading is done, so disk config is overwritten by MGS config.
1156          */
1157         mutex_lock(&nodemap_config_loaded_lock);
1158         rc = nodemap_load_entries(env, obj);
1159         if (!rc)
1160                 nodemap_config_loaded = true;
1161         mutex_unlock(&nodemap_config_loaded_lock);
1162
1163         if (rc) {
1164                 OBD_FREE_PTR(ncf);
1165                 GOTO(out, ncf = ERR_PTR(rc));
1166         }
1167
1168         lu_object_get(&obj->do_lu);
1169
1170         ncf->ncf_obj = obj;
1171         ncf->ncf_los = los;
1172
1173         nodemap_mgs_ncf = ncf;
1174
1175 out:
1176         return ncf;
1177 }
1178 EXPORT_SYMBOL(nm_config_file_register_mgs);
1179
1180 struct nm_config_file *nm_config_file_register_tgt(const struct lu_env *env,
1181                                                    struct dt_device *dev,
1182                                                    struct local_oid_storage *los)
1183 {
1184         struct nm_config_file *ncf;
1185         struct dt_object *config_obj = NULL;
1186         int rc = 0;
1187
1188         OBD_ALLOC_PTR(ncf);
1189         if (ncf == NULL)
1190                 RETURN(ERR_PTR(-ENOMEM));
1191
1192         /* don't load from cache if config already loaded */
1193         mutex_lock(&nodemap_config_loaded_lock);
1194         if (!nodemap_config_loaded) {
1195                 config_obj = nodemap_cache_find_create(env, dev, los, 0);
1196                 if (IS_ERR(config_obj))
1197                         rc = PTR_ERR(config_obj);
1198                 else
1199                         rc = nodemap_load_entries(env, config_obj);
1200
1201                 if (!rc)
1202                         nodemap_config_loaded = true;
1203         }
1204         mutex_unlock(&nodemap_config_loaded_lock);
1205         if (rc)
1206                 GOTO(out_ncf, rc);
1207
1208         /* sync on disk caches w/ loaded config in memory, ncf_obj may change */
1209         if (!config_obj) {
1210                 config_obj = nodemap_save_config_cache(env, dev, los);
1211                 if (IS_ERR(config_obj))
1212                         GOTO(out_ncf, rc = PTR_ERR(config_obj));
1213         }
1214
1215         ncf->ncf_obj = config_obj;
1216         ncf->ncf_los = los;
1217
1218         mutex_lock(&ncf_list_lock);
1219         list_add(&ncf->ncf_list, &ncf_list_head);
1220         mutex_unlock(&ncf_list_lock);
1221
1222 out_ncf:
1223         if (rc) {
1224                 OBD_FREE_PTR(ncf);
1225                 RETURN(ERR_PTR(rc));
1226         }
1227
1228         RETURN(ncf);
1229 }
1230 EXPORT_SYMBOL(nm_config_file_register_tgt);
1231
1232 /**
1233  * Deregister a nm_config_file. Should be called by targets during cleanup.
1234  *
1235  * \param ncf   config file to deregister
1236  */
1237 void nm_config_file_deregister_mgs(const struct lu_env *env,
1238                                    struct nm_config_file *ncf)
1239 {
1240         ENTRY;
1241         LASSERT(nodemap_mgs_ncf == ncf);
1242
1243         nodemap_mgs_ncf = NULL;
1244         if (ncf->ncf_obj)
1245                 dt_object_put(env, ncf->ncf_obj);
1246
1247         OBD_FREE_PTR(ncf);
1248
1249         EXIT;
1250 }
1251 EXPORT_SYMBOL(nm_config_file_deregister_mgs);
1252
1253 void nm_config_file_deregister_tgt(const struct lu_env *env,
1254                                    struct nm_config_file *ncf)
1255 {
1256         ENTRY;
1257
1258         if (ncf == NULL)
1259                 return;
1260
1261         mutex_lock(&ncf_list_lock);
1262         list_del(&ncf->ncf_list);
1263         mutex_unlock(&ncf_list_lock);
1264
1265         if (ncf->ncf_obj)
1266                 dt_object_put(env, ncf->ncf_obj);
1267
1268         OBD_FREE_PTR(ncf);
1269
1270         EXIT;
1271 }
1272 EXPORT_SYMBOL(nm_config_file_deregister_tgt);
1273
1274 int nodemap_process_idx_pages(struct nodemap_config *config, union lu_page *lip,
1275                               struct lu_nodemap **recent_nodemap)
1276 {
1277         struct nodemap_key *key;
1278         union nodemap_rec *rec;
1279         char *entry;
1280         int j;
1281         int k;
1282         int rc = 0;
1283         int size = dt_nodemap_features.dif_keysize_max +
1284                    dt_nodemap_features.dif_recsize_max;
1285         ENTRY;
1286
1287         for (j = 0; j < LU_PAGE_COUNT; j++) {
1288                 if (lip->lp_idx.lip_magic != LIP_MAGIC)
1289                         return -EINVAL;
1290
1291                 /* get and process keys and records from page */
1292                 for (k = 0; k < lip->lp_idx.lip_nr; k++) {
1293                         entry = lip->lp_idx.lip_entries + k * size;
1294                         key = (struct nodemap_key *)entry;
1295
1296                         entry += dt_nodemap_features.dif_keysize_max;
1297                         rec = (union nodemap_rec *)entry;
1298
1299                         rc = nodemap_process_keyrec(config, key, rec,
1300                                                     recent_nodemap);
1301                         if (rc < 0)
1302                                 return rc;
1303                 }
1304                 lip++;
1305         }
1306
1307         EXIT;
1308         return 0;
1309 }
1310 EXPORT_SYMBOL(nodemap_process_idx_pages);
1311
1312 static int nodemap_page_build(const struct lu_env *env, union lu_page *lp,
1313                               size_t nob, const struct dt_it_ops *iops,
1314                               struct dt_it *it, __u32 attr, void *arg)
1315 {
1316         struct idx_info *ii = (struct idx_info *)arg;
1317         struct lu_idxpage *lip = &lp->lp_idx;
1318         char *entry;
1319         size_t size = ii->ii_keysize + ii->ii_recsize;
1320         int rc;
1321         ENTRY;
1322
1323         if (nob < LIP_HDR_SIZE)
1324                 return -EINVAL;
1325
1326         /* initialize the header of the new container */
1327         memset(lip, 0, LIP_HDR_SIZE);
1328         lip->lip_magic = LIP_MAGIC;
1329         nob           -= LIP_HDR_SIZE;
1330
1331         entry = lip->lip_entries;
1332         do {
1333                 char            *tmp_entry = entry;
1334                 struct dt_key   *key;
1335                 __u64           hash;
1336                 enum nodemap_idx_type key_type;
1337
1338                 /* fetch 64-bit hash value */
1339                 hash = iops->store(env, it);
1340                 ii->ii_hash_end = hash;
1341
1342                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_IDX_READ_BREAK)) {
1343                         if (lip->lip_nr != 0)
1344                                 GOTO(out, rc = 0);
1345                 }
1346
1347                 if (nob < size) {
1348                         if (lip->lip_nr == 0)
1349                                 GOTO(out, rc = -EINVAL);
1350                         GOTO(out, rc = 0);
1351                 }
1352
1353                 key = iops->key(env, it);
1354                 key_type = nodemap_get_key_type((struct nodemap_key *)key);
1355
1356                 /* on the first pass, get only the cluster types. On second
1357                  * pass, get all the rest */
1358                 if ((ii->ii_attrs == NM_READ_CLUSTERS &&
1359                                 key_type == NODEMAP_CLUSTER_IDX) ||
1360                     (ii->ii_attrs == NM_READ_ATTRIBUTES &&
1361                                 key_type != NODEMAP_CLUSTER_IDX &&
1362                                 key_type != NODEMAP_EMPTY_IDX)) {
1363                         memcpy(tmp_entry, key, ii->ii_keysize);
1364                         tmp_entry += ii->ii_keysize;
1365
1366                         /* and finally the record */
1367                         rc = iops->rec(env, it, (struct dt_rec *)tmp_entry,
1368                                        attr);
1369                         if (rc != -ESTALE) {
1370                                 if (rc != 0)
1371                                         GOTO(out, rc);
1372
1373                                 /* hash/key/record successfully copied! */
1374                                 lip->lip_nr++;
1375                                 if (unlikely(lip->lip_nr == 1 &&
1376                                     ii->ii_count == 0))
1377                                         ii->ii_hash_start = hash;
1378
1379                                 entry = tmp_entry + ii->ii_recsize;
1380                                 nob -= size;
1381                         }
1382                 }
1383
1384                 /* move on to the next record */
1385                 do {
1386                         rc = iops->next(env, it);
1387                 } while (rc == -ESTALE);
1388
1389                 /* move to second pass */
1390                 if (rc > 0 && ii->ii_attrs == NM_READ_CLUSTERS) {
1391                         ii->ii_attrs = NM_READ_ATTRIBUTES;
1392                         rc = iops->load(env, it, 0);
1393                         if (rc == 0)
1394                                 rc = iops->next(env, it);
1395                         else if (rc > 0)
1396                                 rc = 0;
1397                         else
1398                                 GOTO(out, rc);
1399                 }
1400
1401         } while (rc == 0);
1402
1403         GOTO(out, rc);
1404 out:
1405         if (rc >= 0 && lip->lip_nr > 0)
1406                 /* one more container */
1407                 ii->ii_count++;
1408         if (rc > 0)
1409                 /* no more entries */
1410                 ii->ii_hash_end = II_END_OFF;
1411         return rc;
1412 }
1413
1414
1415 int nodemap_index_read(struct lu_env *env,
1416                        struct nm_config_file *ncf,
1417                        struct idx_info *ii,
1418                        const struct lu_rdpg *rdpg)
1419 {
1420         struct dt_object        *nodemap_idx = ncf->ncf_obj;
1421         __u64                    version;
1422         int                      rc = 0;
1423
1424         ii->ii_keysize = dt_nodemap_features.dif_keysize_max;
1425         ii->ii_recsize = dt_nodemap_features.dif_recsize_max;
1426
1427         dt_read_lock(env, nodemap_idx, 0);
1428         version = dt_version_get(env, nodemap_idx);
1429         if (rdpg->rp_hash != 0 && ii->ii_version != version) {
1430                 CDEBUG(D_INFO, "nodemap config changed inflight, old %llu, new %llu\n",
1431                        ii->ii_version,
1432                        version);
1433                 ii->ii_hash_end = 0;
1434         } else {
1435                 rc = dt_index_walk(env, nodemap_idx, rdpg, nodemap_page_build,
1436                                    ii);
1437                 CDEBUG(D_INFO, "walked index, hashend %llx\n", ii->ii_hash_end);
1438         }
1439
1440         if (rc >= 0)
1441                 ii->ii_version = version;
1442
1443         dt_read_unlock(env, nodemap_idx);
1444         return rc;
1445 }
1446 EXPORT_SYMBOL(nodemap_index_read);
1447
1448 /**
1449  * Returns the current nodemap configuration to MGC by walking the nodemap
1450  * config index and storing it in the response buffer.
1451  *
1452  * \param       req             incoming MGS_CONFIG_READ request
1453  * \retval      0               success
1454  * \retval      -EINVAL         malformed request
1455  * \retval      -ENOTCONN       client evicted/reconnected already
1456  * \retval      -ETIMEDOUT      client timeout or network error
1457  * \retval      -ENOMEM
1458  */
1459 int nodemap_get_config_req(struct obd_device *mgs_obd,
1460                            struct ptlrpc_request *req)
1461 {
1462         const struct ptlrpc_bulk_frag_ops *frag_ops = &ptlrpc_bulk_kiov_pin_ops;
1463         struct mgs_config_body *body;
1464         struct mgs_config_res *res;
1465         struct lu_rdpg rdpg;
1466         struct idx_info nodemap_ii;
1467         struct ptlrpc_bulk_desc *desc;
1468         struct tg_export_data *rqexp_ted = &req->rq_export->exp_target_data;
1469         int i;
1470         int page_count;
1471         int bytes = 0;
1472         int rc = 0;
1473
1474         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1475         if (!body)
1476                 RETURN(-EINVAL);
1477
1478         if (body->mcb_type != CONFIG_T_NODEMAP)
1479                 RETURN(-EINVAL);
1480
1481         rdpg.rp_count = (body->mcb_units << body->mcb_bits);
1482         rdpg.rp_npages = (rdpg.rp_count + PAGE_SIZE - 1) >>
1483                 PAGE_SHIFT;
1484         if (rdpg.rp_npages > PTLRPC_MAX_BRW_PAGES)
1485                 RETURN(-EINVAL);
1486
1487         CDEBUG(D_INFO, "reading nodemap log, name '%s', size = %u\n",
1488                body->mcb_name, rdpg.rp_count);
1489
1490         /* allocate pages to store the containers */
1491         OBD_ALLOC(rdpg.rp_pages, sizeof(*rdpg.rp_pages) * rdpg.rp_npages);
1492         if (rdpg.rp_pages == NULL)
1493                 RETURN(-ENOMEM);
1494         for (i = 0; i < rdpg.rp_npages; i++) {
1495                 rdpg.rp_pages[i] = alloc_page(GFP_NOFS);
1496                 if (rdpg.rp_pages[i] == NULL)
1497                         GOTO(out, rc = -ENOMEM);
1498         }
1499
1500         rdpg.rp_hash = body->mcb_offset;
1501         nodemap_ii.ii_magic = IDX_INFO_MAGIC;
1502         nodemap_ii.ii_flags = II_FL_NOHASH;
1503         nodemap_ii.ii_version = rqexp_ted->ted_nodemap_version;
1504         nodemap_ii.ii_attrs = body->mcb_nm_cur_pass;
1505
1506         bytes = nodemap_index_read(req->rq_svc_thread->t_env,
1507                                    mgs_obd->u.obt.obt_nodemap_config_file,
1508                                    &nodemap_ii, &rdpg);
1509         if (bytes < 0)
1510                 GOTO(out, rc = bytes);
1511
1512         rqexp_ted->ted_nodemap_version = nodemap_ii.ii_version;
1513
1514         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1515         if (res == NULL)
1516                 GOTO(out, rc = -EINVAL);
1517         res->mcr_offset = nodemap_ii.ii_hash_end;
1518         res->mcr_nm_cur_pass = nodemap_ii.ii_attrs;
1519
1520         page_count = (bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
1521         LASSERT(page_count <= rdpg.rp_count);
1522         desc = ptlrpc_prep_bulk_exp(req, page_count, 1,
1523                                     PTLRPC_BULK_PUT_SOURCE |
1524                                         PTLRPC_BULK_BUF_KIOV,
1525                                     MGS_BULK_PORTAL, frag_ops);
1526         if (desc == NULL)
1527                 GOTO(out, rc = -ENOMEM);
1528
1529         for (i = 0; i < page_count && bytes > 0; i++) {
1530                 frag_ops->add_kiov_frag(desc, rdpg.rp_pages[i], 0,
1531                                         min_t(int, bytes, PAGE_SIZE));
1532                 bytes -= PAGE_SIZE;
1533         }
1534
1535         rc = target_bulk_io(req->rq_export, desc);
1536         ptlrpc_free_bulk(desc);
1537
1538 out:
1539         if (rdpg.rp_pages != NULL) {
1540                 for (i = 0; i < rdpg.rp_npages; i++)
1541                         if (rdpg.rp_pages[i] != NULL)
1542                                 __free_page(rdpg.rp_pages[i]);
1543                 OBD_FREE(rdpg.rp_pages,
1544                          rdpg.rp_npages * sizeof(rdpg.rp_pages[0]));
1545         }
1546         return rc;
1547 }
1548 EXPORT_SYMBOL(nodemap_get_config_req);