lustre/mdt/mdt_mds.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2013, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/mdt/mdt_mds.c
  32  *
  33  * Lustre Metadata Service Layer
  34  *
  35  * Author: Di Wang <di.wang@whamcloud.com>
  36  **/
  37
  38 #define DEBUG_SUBSYSTEM S_MDS
  39
  40 #include <linux/module.h>
  41
  42 #include <obd_support.h>
  43 /* struct ptlrpc_request */
  44 #include <lustre_net.h>
  45 /* struct obd_export */
  46 #include <lustre_export.h>
  47 /* struct obd_device */
  48 #include <obd.h>
  49 /* lu2dt_dev() */
  50 #include <dt_object.h>
  51 #include <lustre_mds.h>
  52 #include "mdt_internal.h"
  53 #include <lustre_quota.h>
  54 #include <lustre_acl.h>
  55 #include <lustre_param.h>
  56
  57 struct mds_device {
  58         /* super-class */
  59         struct md_device         mds_md_dev;
  60         struct ptlrpc_service   *mds_regular_service;
  61         struct ptlrpc_service   *mds_readpage_service;
  62         struct ptlrpc_service   *mds_out_service;
  63         struct ptlrpc_service   *mds_setattr_service;
  64         struct ptlrpc_service   *mds_mdsc_service;
  65         struct ptlrpc_service   *mds_mdss_service;
  66         struct ptlrpc_service   *mds_fld_service;
  67         struct mutex             mds_health_mutex;
  68 };
  69
  70 /*
  71  *  * Initialized in mdt_mod_init().
  72  *   */
  73 static unsigned long mdt_num_threads;
  74 CFS_MODULE_PARM(mdt_num_threads, "ul", ulong, 0444,
  75                 "number of MDS service threads to start "
  76                 "(deprecated in favor of mds_num_threads)");
  77
  78 static unsigned long mds_num_threads;
  79 CFS_MODULE_PARM(mds_num_threads, "ul", ulong, 0444,
  80                 "number of MDS service threads to start");
  81
  82 static char *mds_num_cpts;
  83 CFS_MODULE_PARM(mds_num_cpts, "c", charp, 0444,
  84                 "CPU partitions MDS threads should run on");
  85
  86 static unsigned long mds_rdpg_num_threads;
  87 CFS_MODULE_PARM(mds_rdpg_num_threads, "ul", ulong, 0444,
  88                 "number of MDS readpage service threads to start");
  89
  90 static char *mds_rdpg_num_cpts;
  91 CFS_MODULE_PARM(mds_rdpg_num_cpts, "c", charp, 0444,
  92                 "CPU partitions MDS readpage threads should run on");
  93
  94 /* NB: these two should be removed along with setattr service in the future */
  95 static unsigned long mds_attr_num_threads;
  96 CFS_MODULE_PARM(mds_attr_num_threads, "ul", ulong, 0444,
  97                 "number of MDS setattr service threads to start");
  98
  99 static char *mds_attr_num_cpts;
 100 CFS_MODULE_PARM(mds_attr_num_cpts, "c", charp, 0444,
 101                 "CPU partitions MDS setattr threads should run on");
 102
 103 /* device init/fini methods */
 104 static void mds_stop_ptlrpc_service(struct mds_device *m)
 105 {
 106         ENTRY;
 107
 108         mutex_lock(&m->mds_health_mutex);
 109         if (m->mds_regular_service != NULL) {
 110                 ptlrpc_unregister_service(m->mds_regular_service);
 111                 m->mds_regular_service = NULL;
 112         }
 113         if (m->mds_readpage_service != NULL) {
 114                 ptlrpc_unregister_service(m->mds_readpage_service);
 115                 m->mds_readpage_service = NULL;
 116         }
 117         if (m->mds_out_service != NULL) {
 118                 ptlrpc_unregister_service(m->mds_out_service);
 119                 m->mds_out_service = NULL;
 120         }
 121         if (m->mds_setattr_service != NULL) {
 122                 ptlrpc_unregister_service(m->mds_setattr_service);
 123                 m->mds_setattr_service = NULL;
 124         }
 125         if (m->mds_mdsc_service != NULL) {
 126                 ptlrpc_unregister_service(m->mds_mdsc_service);
 127                 m->mds_mdsc_service = NULL;
 128         }
 129         if (m->mds_mdss_service != NULL) {
 130                 ptlrpc_unregister_service(m->mds_mdss_service);
 131                 m->mds_mdss_service = NULL;
 132         }
 133         if (m->mds_fld_service != NULL) {
 134                 ptlrpc_unregister_service(m->mds_fld_service);
 135                 m->mds_fld_service = NULL;
 136         }
 137         mutex_unlock(&m->mds_health_mutex);
 138
 139         EXIT;
 140 }
 141
 142 static int mds_start_ptlrpc_service(struct mds_device *m)
 143 {
 144         static struct ptlrpc_service_conf conf;
 145         struct obd_device *obd = m->mds_md_dev.md_lu_dev.ld_obd;
 146         struct proc_dir_entry *procfs_entry;
 147         int rc = 0;
 148         ENTRY;
 149
 150         procfs_entry = obd->obd_proc_entry;
 151         LASSERT(procfs_entry != NULL);
 152
 153         conf = (typeof(conf)) {
 154                 .psc_name               = LUSTRE_MDT_NAME,
 155                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 156                 .psc_buf                = {
 157                         .bc_nbufs               = MDS_NBUFS,
 158                         .bc_buf_size            = MDS_REG_BUFSIZE,
 159                         .bc_req_max_size        = MDS_REG_MAXREQSIZE,
 160                         .bc_rep_max_size        = MDS_REG_MAXREPSIZE,
 161                         .bc_req_portal          = MDS_REQUEST_PORTAL,
 162                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 163                 },
 164                 /*
 165                  * We'd like to have a mechanism to set this on a per-device
 166                  * basis, but alas...
 167                  */
 168                 .psc_thr                = {
 169                         .tc_thr_name            = LUSTRE_MDT_NAME,
 170                         .tc_thr_factor          = MDS_THR_FACTOR,
 171                         .tc_nthrs_init          = MDS_NTHRS_INIT,
 172                         .tc_nthrs_base          = MDS_NTHRS_BASE,
 173                         .tc_nthrs_max           = MDS_NTHRS_MAX,
 174                         .tc_nthrs_user          = mds_num_threads,
 175                         .tc_cpu_affinity        = 1,
 176                         .tc_ctx_tags            = LCT_MD_THREAD,
 177                 },
 178                 .psc_cpt                = {
 179                         .cc_pattern             = mds_num_cpts,
 180                 },
 181                 .psc_ops                = {
 182                         .so_req_handler         = tgt_request_handle,
 183                         .so_req_printer         = target_print_req,
 184                         .so_hpreq_handler       = ptlrpc_hpreq_handler,
 185                 },
 186         };
 187         m->mds_regular_service = ptlrpc_register_service(&conf, procfs_entry);
 188         if (IS_ERR(m->mds_regular_service)) {
 189                 rc = PTR_ERR(m->mds_regular_service);
 190                 CERROR("failed to start regular mdt service: %d\n", rc);
 191                 m->mds_regular_service = NULL;
 192
 193                 RETURN(rc);
 194         }
 195
 196         /*
 197          * readpage service configuration. Parameters have to be adjusted,
 198          * ideally.
 199          */
 200         memset(&conf, 0, sizeof(conf));
 201         conf = (typeof(conf)) {
 202                 .psc_name               = LUSTRE_MDT_NAME "_readpage",
 203                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 204                 .psc_buf                = {
 205                         .bc_nbufs               = MDS_NBUFS,
 206                         .bc_buf_size            = MDS_BUFSIZE,
 207                         .bc_req_max_size        = MDS_MAXREQSIZE,
 208                         .bc_rep_max_size        = MDS_MAXREPSIZE,
 209                         .bc_req_portal          = MDS_READPAGE_PORTAL,
 210                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 211                 },
 212                 .psc_thr                = {
 213                         .tc_thr_name            = LUSTRE_MDT_NAME "_rdpg",
 214                         .tc_thr_factor          = MDS_RDPG_THR_FACTOR,
 215                         .tc_nthrs_init          = MDS_RDPG_NTHRS_INIT,
 216                         .tc_nthrs_base          = MDS_RDPG_NTHRS_BASE,
 217                         .tc_nthrs_max           = MDS_RDPG_NTHRS_MAX,
 218                         .tc_nthrs_user          = mds_rdpg_num_threads,
 219                         .tc_cpu_affinity        = 1,
 220                         .tc_ctx_tags            = LCT_MD_THREAD,
 221                 },
 222                 .psc_cpt                = {
 223                         .cc_pattern             = mds_rdpg_num_cpts,
 224                 },
 225                 .psc_ops                = {
 226                         .so_req_handler         = tgt_request_handle,
 227                         .so_req_printer         = target_print_req,
 228                 },
 229         };
 230         m->mds_readpage_service = ptlrpc_register_service(&conf, procfs_entry);
 231         if (IS_ERR(m->mds_readpage_service)) {
 232                 rc = PTR_ERR(m->mds_readpage_service);
 233                 CERROR("failed to start readpage service: %d\n", rc);
 234                 m->mds_readpage_service = NULL;
 235
 236                 GOTO(err_mds_svc, rc);
 237         }
 238
 239         /*
 240          * setattr service configuration.
 241          *
 242          * XXX To keep the compatibility with old client(< 2.2), we need to
 243          * preserve this portal for a certain time, it should be removed
 244          * eventually. LU-617.
 245          */
 246         memset(&conf, 0, sizeof(conf));
 247         conf = (typeof(conf)) {
 248                 .psc_name               = LUSTRE_MDT_NAME "_setattr",
 249                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 250                 .psc_buf                = {
 251                         .bc_nbufs               = MDS_NBUFS,
 252                         .bc_buf_size            = MDS_BUFSIZE,
 253                         .bc_req_max_size        = MDS_MAXREQSIZE,
 254                         .bc_rep_max_size        = MDS_LOV_MAXREPSIZE,
 255                         .bc_req_portal          = MDS_SETATTR_PORTAL,
 256                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 257                 },
 258                 .psc_thr                = {
 259                         .tc_thr_name            = LUSTRE_MDT_NAME "_attr",
 260                         .tc_thr_factor          = MDS_SETA_THR_FACTOR,
 261                         .tc_nthrs_init          = MDS_SETA_NTHRS_INIT,
 262                         .tc_nthrs_base          = MDS_SETA_NTHRS_BASE,
 263                         .tc_nthrs_max           = MDS_SETA_NTHRS_MAX,
 264                         .tc_nthrs_user          = mds_attr_num_threads,
 265                         .tc_cpu_affinity        = 1,
 266                         .tc_ctx_tags            = LCT_MD_THREAD,
 267                 },
 268                 .psc_cpt                = {
 269                         .cc_pattern             = mds_attr_num_cpts,
 270                 },
 271                 .psc_ops                = {
 272                         .so_req_handler         = tgt_request_handle,
 273                         .so_req_printer         = target_print_req,
 274                         .so_hpreq_handler       = NULL,
 275                 },
 276         };
 277         m->mds_setattr_service = ptlrpc_register_service(&conf, procfs_entry);
 278         if (IS_ERR(m->mds_setattr_service)) {
 279                 rc = PTR_ERR(m->mds_setattr_service);
 280                 CERROR("failed to start setattr service: %d\n", rc);
 281                 m->mds_setattr_service = NULL;
 282
 283                 GOTO(err_mds_svc, rc);
 284         }
 285
 286         /* Object update service */
 287         conf = (typeof(conf)) {
 288                 .psc_name               = LUSTRE_MDT_NAME "_out",
 289                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 290                 .psc_buf                = {
 291                         .bc_nbufs               = MDS_NBUFS,
 292                         .bc_buf_size            = OUT_BUFSIZE,
 293                         .bc_req_max_size        = OUT_MAXREQSIZE,
 294                         .bc_rep_max_size        = OUT_MAXREPSIZE,
 295                         .bc_req_portal          = OUT_PORTAL,
 296                         .bc_rep_portal          = OSC_REPLY_PORTAL,
 297                 },
 298                 /*
 299                  * We'd like to have a mechanism to set this on a per-device
 300                  * basis, but alas...
 301                  */
 302                 .psc_thr                = {
 303                         .tc_thr_name            = LUSTRE_MDT_NAME "_out",
 304                         .tc_thr_factor          = MDS_THR_FACTOR,
 305                         .tc_nthrs_init          = MDS_NTHRS_INIT,
 306                         .tc_nthrs_base          = MDS_NTHRS_BASE,
 307                         .tc_nthrs_max           = MDS_NTHRS_MAX,
 308                         .tc_nthrs_user          = mds_num_threads,
 309                         .tc_cpu_affinity        = 1,
 310                         .tc_ctx_tags            = LCT_MD_THREAD |
 311                                                   LCT_DT_THREAD,
 312                 },
 313                 .psc_cpt                = {
 314                         .cc_pattern             = mds_num_cpts,
 315                 },
 316                 .psc_ops                = {
 317                         .so_req_handler         = tgt_request_handle,
 318                         .so_req_printer         = target_print_req,
 319                         .so_hpreq_handler       = NULL,
 320                 },
 321         };
 322         m->mds_out_service = ptlrpc_register_service(&conf, procfs_entry);
 323         if (IS_ERR(m->mds_out_service)) {
 324                 rc = PTR_ERR(m->mds_out_service);
 325                 CERROR("failed to start out service: %d\n", rc);
 326                 m->mds_out_service = NULL;
 327                 GOTO(err_mds_svc, rc);
 328         }
 329
 330         /*
 331          * sequence controller service configuration
 332          */
 333         memset(&conf, 0, sizeof(conf));
 334         conf = (typeof(conf)) {
 335                 .psc_name               = LUSTRE_MDT_NAME "_seqs",
 336                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 337                 .psc_buf                = {
 338                         .bc_nbufs               = MDS_NBUFS,
 339                         .bc_buf_size            = SEQ_BUFSIZE,
 340                         .bc_req_max_size        = SEQ_MAXREQSIZE,
 341                         .bc_rep_max_size        = SEQ_MAXREPSIZE,
 342                         .bc_req_portal          = SEQ_CONTROLLER_PORTAL,
 343                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 344                 },
 345                 .psc_thr                = {
 346                         .tc_thr_name            = LUSTRE_MDT_NAME "_seqs",
 347                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 348                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 349                         .tc_ctx_tags            = LCT_MD_THREAD,
 350                 },
 351                 .psc_ops                = {
 352                         .so_req_handler         = tgt_request_handle,
 353                         .so_req_printer         = target_print_req,
 354                         .so_hpreq_handler       = NULL,
 355                 },
 356         };
 357         m->mds_mdsc_service = ptlrpc_register_service(&conf, procfs_entry);
 358         if (IS_ERR(m->mds_mdsc_service)) {
 359                 rc = PTR_ERR(m->mds_mdsc_service);
 360                 CERROR("failed to start seq controller service: %d\n", rc);
 361                 m->mds_mdsc_service = NULL;
 362
 363                 GOTO(err_mds_svc, rc);
 364         }
 365
 366         /*
 367          * metadata sequence server service configuration
 368          */
 369         memset(&conf, 0, sizeof(conf));
 370         conf = (typeof(conf)) {
 371                 .psc_name               = LUSTRE_MDT_NAME "_seqm",
 372                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 373                 .psc_buf                = {
 374                         .bc_nbufs               = MDS_NBUFS,
 375                         .bc_buf_size            = SEQ_BUFSIZE,
 376                         .bc_req_max_size        = SEQ_MAXREQSIZE,
 377                         .bc_rep_max_size        = SEQ_MAXREPSIZE,
 378                         .bc_req_portal          = SEQ_METADATA_PORTAL,
 379                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 380                 },
 381                 .psc_thr                = {
 382                         .tc_thr_name            = LUSTRE_MDT_NAME "_seqm",
 383                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 384                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 385                         .tc_ctx_tags            = LCT_MD_THREAD | LCT_DT_THREAD
 386                 },
 387                 .psc_ops                = {
 388                         .so_req_handler         = tgt_request_handle,
 389                         .so_req_printer         = target_print_req,
 390                         .so_hpreq_handler       = NULL,
 391                 },
 392         };
 393         m->mds_mdss_service = ptlrpc_register_service(&conf, procfs_entry);
 394         if (IS_ERR(m->mds_mdss_service)) {
 395                 rc = PTR_ERR(m->mds_mdss_service);
 396                 CERROR("failed to start metadata seq server service: %d\n", rc);
 397                 m->mds_mdss_service = NULL;
 398
 399                 GOTO(err_mds_svc, rc);
 400         }
 401
 402         /* FLD service start */
 403         memset(&conf, 0, sizeof(conf));
 404         conf = (typeof(conf)) {
 405                 .psc_name            = LUSTRE_MDT_NAME "_fld",
 406                 .psc_watchdog_factor = MDT_SERVICE_WATCHDOG_FACTOR,
 407                 .psc_buf                = {
 408                         .bc_nbufs               = MDS_NBUFS,
 409                         .bc_buf_size            = FLD_BUFSIZE,
 410                         .bc_req_max_size        = FLD_MAXREQSIZE,
 411                         .bc_rep_max_size        = FLD_MAXREPSIZE,
 412                         .bc_req_portal          = FLD_REQUEST_PORTAL,
 413                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 414                 },
 415                 .psc_thr                = {
 416                         .tc_thr_name            = LUSTRE_MDT_NAME "_fld",
 417                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 418                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 419                         .tc_ctx_tags            = LCT_DT_THREAD | LCT_MD_THREAD,
 420                 },
 421                 .psc_ops                = {
 422                         .so_req_handler         = tgt_request_handle,
 423                         .so_req_printer         = target_print_req,
 424                         .so_hpreq_handler       = NULL,
 425                 },
 426         };
 427         m->mds_fld_service = ptlrpc_register_service(&conf, procfs_entry);
 428         if (IS_ERR(m->mds_fld_service)) {
 429                 rc = PTR_ERR(m->mds_fld_service);
 430                 CERROR("failed to start fld service: %d\n", rc);
 431                 m->mds_fld_service = NULL;
 432
 433                 GOTO(err_mds_svc, rc);
 434         }
 435
 436         EXIT;
 437 err_mds_svc:
 438         if (rc)
 439                 mds_stop_ptlrpc_service(m);
 440
 441         return rc;
 442 }
 443
 444 static inline struct mds_device *mds_dev(struct lu_device *d)
 445 {
 446         return container_of0(d, struct mds_device, mds_md_dev.md_lu_dev);
 447 }
 448
 449 static struct lu_device *mds_device_fini(const struct lu_env *env,
 450                                          struct lu_device *d)
 451 {
 452         struct mds_device *m = mds_dev(d);
 453         struct obd_device *obd = d->ld_obd;
 454         ENTRY;
 455
 456         mds_stop_ptlrpc_service(m);
 457         lprocfs_obd_cleanup(obd);
 458         RETURN(NULL);
 459 }
 460
 461 static struct lu_device *mds_device_free(const struct lu_env *env,
 462                                          struct lu_device *d)
 463 {
 464         struct mds_device *m = mds_dev(d);
 465         ENTRY;
 466
 467         md_device_fini(&m->mds_md_dev);
 468         OBD_FREE_PTR(m);
 469         RETURN(NULL);
 470 }
 471
 472 LPROC_SEQ_FOPS_RO_TYPE(mds, uuid);
 473
 474 static struct lprocfs_vars lprocfs_mds_obd_vars[] = {
 475         { "uuid",       &mds_uuid_fops  },
 476         { NULL }
 477 };
 478
 479 static struct lu_device *mds_device_alloc(const struct lu_env *env,
 480                                           struct lu_device_type *t,
 481                                           struct lustre_cfg *cfg)
 482 {
 483         struct mds_device        *m;
 484         struct obd_device        *obd;
 485         struct lu_device          *l;
 486         int rc;
 487
 488         OBD_ALLOC_PTR(m);
 489         if (m == NULL)
 490                 return ERR_PTR(-ENOMEM);
 491
 492         md_device_init(&m->mds_md_dev, t);
 493         l = &m->mds_md_dev.md_lu_dev;
 494
 495         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 496         LASSERT(obd != NULL);
 497
 498         l->ld_obd = obd;
 499         /* set this lu_device to obd, because error handling need it */
 500         obd->obd_lu_dev = l;
 501
 502         obd->obd_vars = lprocfs_mds_obd_vars;
 503         rc = lprocfs_obd_setup(obd);
 504         if (rc != 0) {
 505                 mds_device_free(env, l);
 506                 l = ERR_PTR(rc);
 507                 return l;
 508         }
 509
 510         mutex_init(&m->mds_health_mutex);
 511
 512         rc = mds_start_ptlrpc_service(m);
 513
 514         if (rc != 0) {
 515                 mds_device_free(env, l);
 516                 l = ERR_PTR(rc);
 517                 return l;
 518         }
 519         return l;
 520 }
 521
 522 /* type constructor/destructor: mdt_type_init, mdt_type_fini */
 523 LU_TYPE_INIT_FINI(mds, &mdt_thread_key);
 524
 525 static struct lu_device_type_operations mds_device_type_ops = {
 526         .ldto_init = mds_type_init,
 527         .ldto_fini = mds_type_fini,
 528
 529         .ldto_start = mds_type_start,
 530         .ldto_stop  = mds_type_stop,
 531
 532         .ldto_device_alloc = mds_device_alloc,
 533         .ldto_device_free  = mds_device_free,
 534         .ldto_device_fini  = mds_device_fini
 535 };
 536
 537 static struct lu_device_type mds_device_type = {
 538         .ldt_tags     = LU_DEVICE_MD,
 539         .ldt_name     = LUSTRE_MDS_NAME,
 540         .ldt_ops      = &mds_device_type_ops,
 541         .ldt_ctx_tags = LCT_MD_THREAD
 542 };
 543
 544 static int mds_health_check(const struct lu_env *env, struct obd_device *obd)
 545 {
 546         struct mds_device *mds = mds_dev(obd->obd_lu_dev);
 547         int rc = 0;
 548
 549
 550         mutex_lock(&mds->mds_health_mutex);
 551         rc |= ptlrpc_service_health_check(mds->mds_regular_service);
 552         rc |= ptlrpc_service_health_check(mds->mds_readpage_service);
 553         rc |= ptlrpc_service_health_check(mds->mds_out_service);
 554         rc |= ptlrpc_service_health_check(mds->mds_setattr_service);
 555         rc |= ptlrpc_service_health_check(mds->mds_mdsc_service);
 556         rc |= ptlrpc_service_health_check(mds->mds_mdss_service);
 557         rc |= ptlrpc_service_health_check(mds->mds_fld_service);
 558         mutex_unlock(&mds->mds_health_mutex);
 559
 560         return rc != 0 ? 1 : 0;
 561 }
 562
 563 static struct obd_ops mds_obd_device_ops = {
 564         .o_owner           = THIS_MODULE,
 565         .o_health_check    = mds_health_check,
 566 };
 567
 568 int mds_mod_init(void)
 569 {
 570         if (mdt_num_threads != 0 && mds_num_threads == 0) {
 571                 LCONSOLE_INFO("mdt_num_threads module parameter is deprecated, "
 572                               "use mds_num_threads instead or unset both for "
 573                               "dynamic thread startup\n");
 574                 mds_num_threads = mdt_num_threads;
 575         }
 576
 577         return class_register_type(&mds_obd_device_ops, NULL, true, NULL,
 578                                    LUSTRE_MDS_NAME, &mds_device_type);
 579 }
 580
 581 void mds_mod_exit(void)
 582 {
 583         class_unregister_type(LUSTRE_MDS_NAME);
 584 }