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, 2017, 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 <uapi/linux/lustre/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_mdsc_service;
  64         struct ptlrpc_service   *mds_mdss_service;
  65         struct ptlrpc_service   *mds_fld_service;
  66         struct ptlrpc_service   *mds_io_service;
  67         struct mutex             mds_health_mutex;
  68 };
  69
  70 /*
  71  *  * Initialized in mds_mod_init().
  72  *   */
  73 static unsigned long mds_num_threads;
  74 module_param(mds_num_threads, ulong, 0444);
  75 MODULE_PARM_DESC(mds_num_threads, "number of MDS service threads to start");
  76
  77 static unsigned int mds_cpu_bind = 1;
  78 module_param(mds_cpu_bind, uint, 0444);
  79 MODULE_PARM_DESC(mds_cpu_bind,
  80                  "bind MDS threads to particular CPU partitions");
  81
  82 int mds_max_io_threads = 512;
  83 module_param(mds_max_io_threads, int, 0444);
  84 MODULE_PARM_DESC(mds_max_io_threads,
  85                  "maximum number of MDS IO service threads");
  86
  87 static unsigned int mds_io_cpu_bind = 1;
  88 module_param(mds_io_cpu_bind, uint, 0444);
  89 MODULE_PARM_DESC(mds_io_cpu_bind,
  90                  "bind MDS IO threads to particular CPU partitions");
  91
  92 static char *mds_io_num_cpts;
  93 module_param(mds_io_num_cpts, charp, 0444);
  94 MODULE_PARM_DESC(mds_io_num_cpts,
  95                  "CPU partitions MDS IO threads should run on");
  96
  97 static struct cfs_cpt_table *mdt_io_cptable;
  98
  99 static char *mds_num_cpts;
 100 module_param(mds_num_cpts, charp, 0444);
 101 MODULE_PARM_DESC(mds_num_cpts, "CPU partitions MDS threads should run on");
 102
 103 static unsigned long mds_rdpg_num_threads;
 104 module_param(mds_rdpg_num_threads, ulong, 0444);
 105 MODULE_PARM_DESC(mds_rdpg_num_threads,
 106                  "number of MDS readpage service threads to start");
 107
 108 static unsigned int mds_rdpg_cpu_bind = 1;
 109 module_param(mds_rdpg_cpu_bind, uint, 0444);
 110 MODULE_PARM_DESC(mds_rdpg_cpu_bind,
 111                  "bind MDS readpage threads to particular CPU partitions");
 112
 113 static char *mds_rdpg_num_cpts;
 114 module_param(mds_rdpg_num_cpts, charp, 0444);
 115 MODULE_PARM_DESC(mds_rdpg_num_cpts,
 116                  "CPU partitions MDS readpage threads should run on");
 117
 118 /* device init/fini methods */
 119 static void mds_stop_ptlrpc_service(struct mds_device *m)
 120 {
 121         ENTRY;
 122
 123         mutex_lock(&m->mds_health_mutex);
 124         if (m->mds_regular_service != NULL) {
 125                 ptlrpc_unregister_service(m->mds_regular_service);
 126                 m->mds_regular_service = NULL;
 127         }
 128         if (m->mds_readpage_service != NULL) {
 129                 ptlrpc_unregister_service(m->mds_readpage_service);
 130                 m->mds_readpage_service = NULL;
 131         }
 132         if (m->mds_out_service != NULL) {
 133                 ptlrpc_unregister_service(m->mds_out_service);
 134                 m->mds_out_service = NULL;
 135         }
 136         if (m->mds_mdsc_service != NULL) {
 137                 ptlrpc_unregister_service(m->mds_mdsc_service);
 138                 m->mds_mdsc_service = NULL;
 139         }
 140         if (m->mds_mdss_service != NULL) {
 141                 ptlrpc_unregister_service(m->mds_mdss_service);
 142                 m->mds_mdss_service = NULL;
 143         }
 144         if (m->mds_fld_service != NULL) {
 145                 ptlrpc_unregister_service(m->mds_fld_service);
 146                 m->mds_fld_service = NULL;
 147         }
 148         if (m->mds_io_service != NULL) {
 149                 ptlrpc_unregister_service(m->mds_io_service);
 150                 m->mds_io_service = NULL;
 151         }
 152         mutex_unlock(&m->mds_health_mutex);
 153
 154         if (mdt_io_cptable != NULL) {
 155                 cfs_cpt_table_free(mdt_io_cptable);
 156                 mdt_io_cptable = NULL;
 157         }
 158
 159         EXIT;
 160 }
 161
 162 static int ldlm_enqueue_hpreq_check(struct ptlrpc_request *req)
 163 {
 164         struct ldlm_request *dlm_req;
 165         int rc = 0;
 166         ENTRY;
 167
 168         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_REPLAY|MSG_RESENT)) !=
 169             MSG_RESENT)
 170                 RETURN(0);
 171
 172         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 173         req_capsule_set(&req->rq_pill, &RQF_LDLM_ENQUEUE);
 174         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 175         if (dlm_req == NULL)
 176                 RETURN(-EFAULT);
 177
 178         if (dlm_req->lock_count > 0) {
 179                 struct ldlm_lock *lock;
 180
 181                 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
 182                                        (void *)&dlm_req->lock_handle[0]);
 183
 184                 DEBUG_REQ(D_RPCTRACE, req, "lock %p cookie 0x%llx",
 185                         lock, dlm_req->lock_handle[0].cookie);
 186                 if (lock != NULL) {
 187                         rc = lock->l_granted_mode == lock->l_req_mode;
 188                         if (rc)
 189                                 LDLM_DEBUG(lock, "hpreq resend");
 190                         LDLM_LOCK_RELEASE(lock);
 191                 }
 192         }
 193
 194         RETURN(rc);
 195 }
 196
 197 static struct ptlrpc_hpreq_ops ldlm_enqueue_hpreq_ops = {
 198         .hpreq_lock_match = NULL,
 199         .hpreq_check      = ldlm_enqueue_hpreq_check,
 200         .hpreq_fini       = NULL,
 201 };
 202
 203 static int mds_hpreq_handler(struct ptlrpc_request *req)
 204 {
 205         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_ENQUEUE)
 206                 req->rq_ops = &ldlm_enqueue_hpreq_ops;
 207         else
 208                 ptlrpc_hpreq_handler(req);
 209         return 0;
 210 }
 211
 212 static int mds_start_ptlrpc_service(struct mds_device *m)
 213 {
 214         static struct ptlrpc_service_conf conf;
 215         struct obd_device *obd = m->mds_md_dev.md_lu_dev.ld_obd;
 216         nodemask_t *mask;
 217         int rc = 0;
 218
 219         ENTRY;
 220
 221         conf = (typeof(conf)) {
 222                 .psc_name               = LUSTRE_MDT_NAME,
 223                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 224                 .psc_buf                = {
 225                         .bc_nbufs               = MDS_NBUFS,
 226                         .bc_buf_size            = MDS_REG_BUFSIZE,
 227                         .bc_req_max_size        = MDS_REG_MAXREQSIZE,
 228                         .bc_rep_max_size        = MDS_REG_MAXREPSIZE,
 229                         .bc_req_portal          = MDS_REQUEST_PORTAL,
 230                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 231                 },
 232                 /*
 233                  * We'd like to have a mechanism to set this on a per-device
 234                  * basis, but alas...
 235                  */
 236                 .psc_thr                = {
 237                         .tc_thr_name            = LUSTRE_MDT_NAME,
 238                         .tc_thr_factor          = MDS_THR_FACTOR,
 239                         .tc_nthrs_init          = MDS_NTHRS_INIT,
 240                         .tc_nthrs_base          = MDS_NTHRS_BASE,
 241                         .tc_nthrs_max           = MDS_NTHRS_MAX,
 242                         .tc_nthrs_user          = mds_num_threads,
 243                         .tc_cpu_bind            = mds_cpu_bind,
 244                         /* LCT_DT_THREAD is required as MDT threads may scan
 245                          * all LDLM namespaces (including OFD-originated) to
 246                          * cancel LDLM locks */
 247                         .tc_ctx_tags            = LCT_MD_THREAD | LCT_DT_THREAD,
 248                 },
 249                 .psc_cpt                = {
 250                         .cc_pattern             = mds_num_cpts,
 251                         .cc_affinity            = true,
 252                 },
 253                 .psc_ops                = {
 254                         .so_req_handler         = tgt_request_handle,
 255                         .so_req_printer         = target_print_req,
 256                         .so_hpreq_handler       = mds_hpreq_handler,
 257                 },
 258         };
 259         m->mds_regular_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 260                                                          obd->obd_debugfs_entry);
 261         if (IS_ERR(m->mds_regular_service)) {
 262                 rc = PTR_ERR(m->mds_regular_service);
 263                 CERROR("failed to start regular mdt service: %d\n", rc);
 264                 m->mds_regular_service = NULL;
 265
 266                 RETURN(rc);
 267         }
 268
 269         /*
 270          * readpage service configuration. Parameters have to be adjusted,
 271          * ideally.
 272          */
 273         memset(&conf, 0, sizeof(conf));
 274         conf = (typeof(conf)) {
 275                 .psc_name               = LUSTRE_MDT_NAME "_readpage",
 276                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 277                 .psc_buf                = {
 278                         .bc_nbufs               = MDS_NBUFS,
 279                         .bc_buf_size            = MDS_BUFSIZE,
 280                         .bc_req_max_size        = MDS_MAXREQSIZE,
 281                         .bc_rep_max_size        = MDS_MAXREPSIZE,
 282                         .bc_req_portal          = MDS_READPAGE_PORTAL,
 283                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 284                 },
 285                 .psc_thr                = {
 286                         .tc_thr_name            = LUSTRE_MDT_NAME "_rdpg",
 287                         .tc_thr_factor          = MDS_RDPG_THR_FACTOR,
 288                         .tc_nthrs_init          = MDS_RDPG_NTHRS_INIT,
 289                         .tc_nthrs_base          = MDS_RDPG_NTHRS_BASE,
 290                         .tc_nthrs_max           = MDS_RDPG_NTHRS_MAX,
 291                         .tc_nthrs_user          = mds_rdpg_num_threads,
 292                         .tc_cpu_bind            = mds_rdpg_cpu_bind,
 293                         .tc_ctx_tags            = LCT_MD_THREAD,
 294                 },
 295                 .psc_cpt                = {
 296                         .cc_pattern             = mds_rdpg_num_cpts,
 297                         .cc_affinity            = true,
 298                 },
 299                 .psc_ops                = {
 300                         .so_req_handler         = tgt_request_handle,
 301                         .so_req_printer         = target_print_req,
 302                 },
 303         };
 304         m->mds_readpage_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 305                                                           obd->obd_debugfs_entry);
 306         if (IS_ERR(m->mds_readpage_service)) {
 307                 rc = PTR_ERR(m->mds_readpage_service);
 308                 CERROR("failed to start readpage service: %d\n", rc);
 309                 m->mds_readpage_service = NULL;
 310
 311                 GOTO(err_mds_svc, rc);
 312         }
 313
 314         /* Object update service */
 315         conf = (typeof(conf)) {
 316                 .psc_name               = LUSTRE_MDT_NAME "_out",
 317                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 318                 .psc_buf                = {
 319                         .bc_nbufs               = MDS_NBUFS,
 320                         .bc_buf_size            = OUT_BUFSIZE,
 321                         .bc_req_max_size        = OUT_MAXREQSIZE,
 322                         .bc_rep_max_size        = OUT_MAXREPSIZE,
 323                         .bc_req_portal          = OUT_PORTAL,
 324                         .bc_rep_portal          = OSC_REPLY_PORTAL,
 325                 },
 326                 /*
 327                  * We'd like to have a mechanism to set this on a per-device
 328                  * basis, but alas...
 329                  */
 330                 .psc_thr                = {
 331                         .tc_thr_name            = LUSTRE_MDT_NAME "_out",
 332                         .tc_thr_factor          = MDS_THR_FACTOR,
 333                         .tc_nthrs_init          = MDS_NTHRS_INIT,
 334                         .tc_nthrs_base          = MDS_NTHRS_BASE,
 335                         .tc_nthrs_max           = MDS_NTHRS_MAX,
 336                         .tc_nthrs_user          = mds_num_threads,
 337                         .tc_cpu_bind            = mds_cpu_bind,
 338                         .tc_ctx_tags            = LCT_MD_THREAD |
 339                                                   LCT_DT_THREAD,
 340                 },
 341                 .psc_cpt                = {
 342                         .cc_pattern             = mds_num_cpts,
 343                         .cc_affinity            = true,
 344                 },
 345                 .psc_ops                = {
 346                         .so_req_handler         = tgt_request_handle,
 347                         .so_req_printer         = target_print_req,
 348                         .so_hpreq_handler       = NULL,
 349                 },
 350         };
 351         m->mds_out_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 352                                                      obd->obd_debugfs_entry);
 353         if (IS_ERR(m->mds_out_service)) {
 354                 rc = PTR_ERR(m->mds_out_service);
 355                 CERROR("failed to start out service: %d\n", rc);
 356                 m->mds_out_service = NULL;
 357                 GOTO(err_mds_svc, rc);
 358         }
 359
 360         /*
 361          * sequence controller service configuration
 362          */
 363         memset(&conf, 0, sizeof(conf));
 364         conf = (typeof(conf)) {
 365                 .psc_name               = LUSTRE_MDT_NAME "_seqs",
 366                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 367                 .psc_buf                = {
 368                         .bc_nbufs               = MDS_NBUFS,
 369                         .bc_buf_size            = SEQ_BUFSIZE,
 370                         .bc_req_max_size        = SEQ_MAXREQSIZE,
 371                         .bc_rep_max_size        = SEQ_MAXREPSIZE,
 372                         .bc_req_portal          = SEQ_CONTROLLER_PORTAL,
 373                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 374                 },
 375                 .psc_thr                = {
 376                         .tc_thr_name            = LUSTRE_MDT_NAME "_seqs",
 377                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 378                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 379                         .tc_ctx_tags            = LCT_MD_THREAD,
 380                 },
 381                 .psc_ops                = {
 382                         .so_req_handler         = tgt_request_handle,
 383                         .so_req_printer         = target_print_req,
 384                         .so_hpreq_handler       = NULL,
 385                 },
 386         };
 387         m->mds_mdsc_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 388                                                       obd->obd_debugfs_entry);
 389         if (IS_ERR(m->mds_mdsc_service)) {
 390                 rc = PTR_ERR(m->mds_mdsc_service);
 391                 CERROR("failed to start seq controller service: %d\n", rc);
 392                 m->mds_mdsc_service = NULL;
 393
 394                 GOTO(err_mds_svc, rc);
 395         }
 396
 397         /*
 398          * metadata sequence server service configuration
 399          */
 400         memset(&conf, 0, sizeof(conf));
 401         conf = (typeof(conf)) {
 402                 .psc_name               = LUSTRE_MDT_NAME "_seqm",
 403                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 404                 .psc_buf                = {
 405                         .bc_nbufs               = MDS_NBUFS,
 406                         .bc_buf_size            = SEQ_BUFSIZE,
 407                         .bc_req_max_size        = SEQ_MAXREQSIZE,
 408                         .bc_rep_max_size        = SEQ_MAXREPSIZE,
 409                         .bc_req_portal          = SEQ_METADATA_PORTAL,
 410                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 411                 },
 412                 .psc_thr                = {
 413                         .tc_thr_name            = LUSTRE_MDT_NAME "_seqm",
 414                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 415                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 416                         .tc_ctx_tags            = LCT_MD_THREAD | LCT_DT_THREAD
 417                 },
 418                 .psc_ops                = {
 419                         .so_req_handler         = tgt_request_handle,
 420                         .so_req_printer         = target_print_req,
 421                         .so_hpreq_handler       = NULL,
 422                 },
 423         };
 424         m->mds_mdss_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 425                                                       obd->obd_debugfs_entry);
 426         if (IS_ERR(m->mds_mdss_service)) {
 427                 rc = PTR_ERR(m->mds_mdss_service);
 428                 CERROR("failed to start metadata seq server service: %d\n", rc);
 429                 m->mds_mdss_service = NULL;
 430
 431                 GOTO(err_mds_svc, rc);
 432         }
 433
 434         /* FLD service start */
 435         memset(&conf, 0, sizeof(conf));
 436         conf = (typeof(conf)) {
 437                 .psc_name            = LUSTRE_MDT_NAME "_fld",
 438                 .psc_watchdog_factor = MDT_SERVICE_WATCHDOG_FACTOR,
 439                 .psc_buf                = {
 440                         .bc_nbufs               = MDS_NBUFS,
 441                         .bc_buf_size            = FLD_BUFSIZE,
 442                         .bc_req_max_size        = FLD_MAXREQSIZE,
 443                         .bc_rep_max_size        = FLD_MAXREPSIZE,
 444                         .bc_req_portal          = FLD_REQUEST_PORTAL,
 445                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 446                 },
 447                 .psc_thr                = {
 448                         .tc_thr_name            = LUSTRE_MDT_NAME "_fld",
 449                         .tc_nthrs_init          = MDS_OTHR_NTHRS_INIT,
 450                         .tc_nthrs_max           = MDS_OTHR_NTHRS_MAX,
 451                         .tc_ctx_tags            = LCT_DT_THREAD | LCT_MD_THREAD,
 452                 },
 453                 .psc_ops                = {
 454                         .so_req_handler         = tgt_request_handle,
 455                         .so_req_printer         = target_print_req,
 456                         .so_hpreq_handler       = NULL,
 457                 },
 458         };
 459         m->mds_fld_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 460                                                      obd->obd_debugfs_entry);
 461         if (IS_ERR(m->mds_fld_service)) {
 462                 rc = PTR_ERR(m->mds_fld_service);
 463                 CERROR("failed to start fld service: %d\n", rc);
 464                 m->mds_fld_service = NULL;
 465
 466                 GOTO(err_mds_svc, rc);
 467         }
 468
 469
 470         mask = cfs_cpt_nodemask(cfs_cpt_tab, CFS_CPT_ANY);
 471         /* event CPT feature is disabled in libcfs level by set partition
 472          * number to 1, we still want to set node affinity for io service */
 473         if (cfs_cpt_number(cfs_cpt_tab) == 1 && nodes_weight(*mask) > 1) {
 474                 int cpt = 0;
 475                 int i;
 476
 477                 mdt_io_cptable = cfs_cpt_table_alloc(nodes_weight(*mask));
 478                 for_each_node_mask(i, *mask) {
 479                         if (mdt_io_cptable == NULL) {
 480                                 CWARN("MDS failed to create CPT table\n");
 481                                 break;
 482                         }
 483
 484                         rc = cfs_cpt_set_node(mdt_io_cptable, cpt++, i);
 485                         if (!rc) {
 486                                 CWARN("MDS Failed to set node %d for IO CPT table\n",
 487                                       i);
 488                                 cfs_cpt_table_free(mdt_io_cptable);
 489                                 mdt_io_cptable = NULL;
 490                                 break;
 491                         }
 492                 }
 493         }
 494
 495         memset(&conf, 0, sizeof(conf));
 496         conf = (typeof(conf)) {
 497                 .psc_name               = LUSTRE_MDT_NAME "_io",
 498                 .psc_watchdog_factor    = MDT_SERVICE_WATCHDOG_FACTOR,
 499                 .psc_buf                = {
 500                         .bc_nbufs               = OST_NBUFS,
 501                         .bc_buf_size            = OST_IO_BUFSIZE,
 502                         .bc_req_max_size        = OST_IO_MAXREQSIZE,
 503                         .bc_rep_max_size        = OST_IO_MAXREPSIZE,
 504                         .bc_req_portal          = MDS_IO_PORTAL,
 505                         .bc_rep_portal          = MDC_REPLY_PORTAL,
 506                 },
 507                 .psc_thr                = {
 508                         .tc_thr_name            = LUSTRE_MDT_NAME "_io",
 509                         .tc_thr_factor          = OSS_THR_FACTOR,
 510                         .tc_nthrs_init          = OSS_NTHRS_INIT,
 511                         .tc_nthrs_base          = OSS_NTHRS_BASE,
 512                         .tc_nthrs_max           = mds_max_io_threads,
 513                         .tc_nthrs_user          = mds_num_threads,
 514                         .tc_cpu_bind            = mds_io_cpu_bind,
 515                         .tc_ctx_tags            = LCT_DT_THREAD | LCT_MD_THREAD,
 516                 },
 517                 .psc_cpt                = {
 518                         .cc_cptable             = mdt_io_cptable,
 519                         .cc_pattern             = mdt_io_cptable == NULL ?
 520                                                   mds_io_num_cpts : NULL,
 521                         .cc_affinity            = true,
 522                 },
 523                 .psc_ops                = {
 524                         .so_thr_init            = tgt_io_thread_init,
 525                         .so_thr_done            = tgt_io_thread_done,
 526                         .so_req_handler         = tgt_request_handle,
 527                         .so_req_printer         = target_print_req,
 528                         .so_hpreq_handler       = tgt_hpreq_handler,
 529                 },
 530         };
 531         m->mds_io_service = ptlrpc_register_service(&conf, &obd->obd_kset,
 532                                                     obd->obd_debugfs_entry);
 533         if (IS_ERR(m->mds_io_service)) {
 534                 rc = PTR_ERR(m->mds_io_service);
 535                 CERROR("failed to start MDT I/O service: %d\n", rc);
 536                 m->mds_io_service = NULL;
 537                 GOTO(err_mds_svc, rc);
 538         }
 539
 540         EXIT;
 541 err_mds_svc:
 542         if (rc)
 543                 mds_stop_ptlrpc_service(m);
 544
 545         return rc;
 546 }
 547
 548 static inline struct mds_device *mds_dev(struct lu_device *d)
 549 {
 550         return container_of_safe(d, struct mds_device, mds_md_dev.md_lu_dev);
 551 }
 552
 553 static struct lu_device *mds_device_fini(const struct lu_env *env,
 554                                          struct lu_device *d)
 555 {
 556         struct mds_device *m = mds_dev(d);
 557         struct obd_device *obd = d->ld_obd;
 558         ENTRY;
 559
 560         mds_stop_ptlrpc_service(m);
 561         lprocfs_obd_cleanup(obd);
 562         RETURN(NULL);
 563 }
 564
 565 static struct lu_device *mds_device_free(const struct lu_env *env,
 566                                          struct lu_device *d)
 567 {
 568         struct mds_device *m = mds_dev(d);
 569         ENTRY;
 570
 571         md_device_fini(&m->mds_md_dev);
 572         OBD_FREE_PTR(m);
 573         RETURN(NULL);
 574 }
 575
 576 static struct lu_device *mds_device_alloc(const struct lu_env *env,
 577                                           struct lu_device_type *t,
 578                                           struct lustre_cfg *cfg)
 579 {
 580         struct mds_device        *m;
 581         struct obd_device        *obd;
 582         struct lu_device          *l;
 583         int rc;
 584
 585         OBD_ALLOC_PTR(m);
 586         if (m == NULL)
 587                 return ERR_PTR(-ENOMEM);
 588
 589         md_device_init(&m->mds_md_dev, t);
 590         l = &m->mds_md_dev.md_lu_dev;
 591
 592         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 593         LASSERT(obd != NULL);
 594
 595         l->ld_obd = obd;
 596         /* set this lu_device to obd, because error handling need it */
 597         obd->obd_lu_dev = l;
 598
 599         rc = lprocfs_obd_setup(obd, true);
 600         if (rc != 0) {
 601                 mds_device_free(env, l);
 602                 l = ERR_PTR(rc);
 603                 return l;
 604         }
 605
 606         mutex_init(&m->mds_health_mutex);
 607
 608         rc = mds_start_ptlrpc_service(m);
 609         if (rc != 0) {
 610                 lprocfs_obd_cleanup(obd);
 611                 mds_device_free(env, l);
 612                 l = ERR_PTR(rc);
 613                 return l;
 614         }
 615         return l;
 616 }
 617
 618 /* type constructor/destructor: mdt_type_init, mdt_type_fini */
 619 LU_TYPE_INIT_FINI(mds, &mdt_thread_key);
 620
 621 static const struct lu_device_type_operations mds_device_type_ops = {
 622         .ldto_init = mds_type_init,
 623         .ldto_fini = mds_type_fini,
 624
 625         .ldto_start = mds_type_start,
 626         .ldto_stop  = mds_type_stop,
 627
 628         .ldto_device_alloc = mds_device_alloc,
 629         .ldto_device_free  = mds_device_free,
 630         .ldto_device_fini  = mds_device_fini
 631 };
 632
 633 static struct lu_device_type mds_device_type = {
 634         .ldt_tags     = LU_DEVICE_MD,
 635         .ldt_name     = LUSTRE_MDS_NAME,
 636         .ldt_ops      = &mds_device_type_ops,
 637         .ldt_ctx_tags = LCT_MD_THREAD
 638 };
 639
 640 static int mds_health_check(const struct lu_env *env, struct obd_device *obd)
 641 {
 642         struct mds_device *mds = mds_dev(obd->obd_lu_dev);
 643         int rc = 0;
 644
 645
 646         mutex_lock(&mds->mds_health_mutex);
 647         rc |= ptlrpc_service_health_check(mds->mds_regular_service);
 648         rc |= ptlrpc_service_health_check(mds->mds_readpage_service);
 649         rc |= ptlrpc_service_health_check(mds->mds_out_service);
 650         rc |= ptlrpc_service_health_check(mds->mds_mdsc_service);
 651         rc |= ptlrpc_service_health_check(mds->mds_mdss_service);
 652         rc |= ptlrpc_service_health_check(mds->mds_fld_service);
 653         rc |= ptlrpc_service_health_check(mds->mds_io_service);
 654         mutex_unlock(&mds->mds_health_mutex);
 655
 656         return rc != 0 ? 1 : 0;
 657 }
 658
 659 static const struct obd_ops mds_obd_device_ops = {
 660         .o_owner           = THIS_MODULE,
 661         .o_health_check    = mds_health_check,
 662 };
 663
 664 int mds_mod_init(void)
 665 {
 666         return class_register_type(&mds_obd_device_ops, NULL, false,
 667                                    LUSTRE_MDS_NAME, &mds_device_type);
 668 }
 669
 670 void mds_mod_exit(void)
 671 {
 672         class_unregister_type(LUSTRE_MDS_NAME);
 673 }