lustre/mgs/mgs_handler.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/mgs/mgs_handler.c
   5  *  Lustre Management Server (mgs) request handler
   6  *
   7  *  Copyright (C) 2001-2005 Cluster File Systems, Inc.
   8  *   Author Nathan <nathan@clusterfs.com>
   9  *   Author LinSongTao <lincent@clusterfs.com>
  10  *
  11  *   This file is part of Lustre, http://www.lustre.org.
  12  *
  13  *   Lustre is free software; you can redistribute it and/or
  14  *   modify it under the terms of version 2 of the GNU General Public
  15  *   License as published by the Free Software Foundation.
  16  *
  17  *   Lustre is distributed in the hope that it will be useful,
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *   GNU General Public License for more details.
  21  *
  22  *   You should have received a copy of the GNU General Public License
  23  *   along with Lustre; if not, write to the Free Software
  24  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #ifndef EXPORT_SYMTAB
  28 # define EXPORT_SYMTAB
  29 #endif
  30 #define DEBUG_SUBSYSTEM S_MGS
  31 #define D_MGS D_INFO|D_ERROR
  32
  33 #ifdef __KERNEL__
  34 # include <linux/module.h>
  35 # include <linux/pagemap.h>
  36 # include <linux/miscdevice.h>
  37 # include <linux/init.h>
  38 #else
  39 # include <liblustre.h>
  40 #endif
  41
  42 #include <linux/obd_class.h>
  43 #include <linux/lustre_dlm.h>
  44 #include <linux/lprocfs_status.h>
  45 #include <linux/lustre_fsfilt.h>
  46 #include <linux/lustre_commit_confd.h>
  47 #include <linux/lustre_disk.h>
  48 #include "mgs_internal.h"
  49
  50 static int mgs_cleanup(struct obd_device *obd);
  51
  52 /* Establish a connection to the MGS.*/
  53 static int mgs_connect(struct lustre_handle *conn, struct obd_device *obd,
  54                        struct obd_uuid *cluuid, struct obd_connect_data *data)
  55 {
  56         struct obd_export *exp;
  57         int rc;
  58         ENTRY;
  59
  60         if (!conn || !obd || !cluuid)
  61                 RETURN(-EINVAL);
  62
  63         rc = class_connect(conn, obd, cluuid);
  64         if (rc)
  65                 RETURN(rc);
  66         exp = class_conn2export(conn);
  67         LASSERT(exp);
  68
  69         if (data != NULL) {
  70                 data->ocd_connect_flags &= MGMT_CONNECT_SUPPORTED;
  71                 exp->exp_connect_flags = data->ocd_connect_flags;
  72         }
  73
  74         if (rc) {
  75                 class_disconnect(exp);
  76         } else {
  77                 class_export_put(exp);
  78         }
  79
  80         RETURN(rc);
  81 }
  82
  83 static int mgs_disconnect(struct obd_export *exp)
  84 {
  85         unsigned long irqflags;
  86         int rc;
  87         ENTRY;
  88
  89         LASSERT(exp);
  90         class_export_get(exp);
  91
  92         /* Disconnect early so that clients can't keep using export */
  93         rc = class_disconnect(exp);
  94         ldlm_cancel_locks_for_export(exp);
  95
  96         /* complete all outstanding replies */
  97         spin_lock_irqsave(&exp->exp_lock, irqflags);
  98         while (!list_empty(&exp->exp_outstanding_replies)) {
  99                 struct ptlrpc_reply_state *rs =
 100                         list_entry(exp->exp_outstanding_replies.next,
 101                                    struct ptlrpc_reply_state, rs_exp_list);
 102                 struct ptlrpc_service *svc = rs->rs_service;
 103
 104                 spin_lock(&svc->srv_lock);
 105                 list_del_init(&rs->rs_exp_list);
 106                 ptlrpc_schedule_difficult_reply(rs);
 107                 spin_unlock(&svc->srv_lock);
 108         }
 109         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
 110
 111         class_export_put(exp);
 112         RETURN(rc);
 113 }
 114
 115 /* Start the MGS obd */
 116 static int mgs_setup(struct obd_device *obd, obd_count len, void *buf)
 117 {
 118         struct lprocfs_static_vars lvars;
 119         char *ns_name = "MGS";
 120         struct mgs_obd *mgs = &obd->u.mgs;
 121         struct lustre_mount_info *lmi;
 122         struct lustre_sb_info *lsi;
 123         struct vfsmount *mnt;
 124         int rc = 0;
 125         ENTRY;
 126
 127         CDEBUG(D_CONFIG, "Starting MGS\n");
 128
 129         lmi = server_get_mount(obd->obd_name);
 130         if (!lmi)
 131                 RETURN(rc = -EINVAL);
 132
 133         mnt = lmi->lmi_mnt;
 134         lsi = s2lsi(lmi->lmi_sb);
 135         obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
 136         if (IS_ERR(obd->obd_fsops))
 137                 GOTO(err_put, rc = PTR_ERR(obd->obd_fsops));
 138
 139         /* namespace for mgs llog */
 140         obd->obd_namespace = ldlm_namespace_new(ns_name, LDLM_NAMESPACE_SERVER);
 141         if (obd->obd_namespace == NULL) {
 142                 mgs_cleanup(obd);
 143                 GOTO(err_ops, rc = -ENOMEM);
 144         }
 145
 146         LASSERT(!lvfs_check_rdonly(lvfs_sbdev(mnt->mnt_sb)));
 147
 148         rc = mgs_fs_setup(obd, mnt);
 149         if (rc) {
 150                 CERROR("%s: MGS filesystem method init failed: rc = %d\n",
 151                        obd->obd_name, rc);
 152                 GOTO(err_ns, rc);
 153         }
 154
 155         rc = llog_start_commit_thread();
 156         if (rc < 0)
 157                 GOTO(err_fs, rc);
 158
 159         rc = llog_setup(obd, LLOG_CONFIG_ORIG_CTXT, obd, 0, NULL,
 160                         &llog_lvfs_ops);
 161         if (rc)
 162                 GOTO(err_fs, rc);
 163
 164         mgs_init_db_list(obd);
 165
 166         lprocfs_init_vars(mgs, &lvars);
 167         lprocfs_obd_setup(obd, lvars.obd_vars);
 168
 169         LCONSOLE_INFO("MGS %s started\n", obd->obd_name);
 170
 171         ldlm_timeout = 6;
 172         ping_evictor_start();
 173
 174         RETURN(0);
 175
 176 err_fs:
 177         /* No extra cleanup needed for llog_init_commit_thread() */
 178         mgs_fs_cleanup(obd);
 179 err_ns:
 180         ldlm_namespace_free(obd->obd_namespace, 0);
 181         obd->obd_namespace = NULL;
 182 err_ops:
 183         fsfilt_put_ops(obd->obd_fsops);
 184 err_put:
 185         server_put_mount(obd->obd_name, mgs->mgs_vfsmnt);
 186         mgs->mgs_sb = 0;
 187         return rc;
 188 }
 189
 190 static int mgs_precleanup(struct obd_device *obd, int stage)
 191 {
 192         int rc = 0;
 193         ENTRY;
 194
 195         CDEBUG(D_MGS, "precleanup %d\n", stage);
 196
 197         switch (stage) {
 198         case OBD_CLEANUP_SELF_EXP:
 199                 mgs_cleanup_db_list(obd);
 200                 llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
 201                 rc = obd_llog_finish(obd, 0);
 202         }
 203         RETURN(rc);
 204 }
 205
 206 static int mgs_cleanup(struct obd_device *obd)
 207 {
 208         struct mgs_obd *mgs = &obd->u.mgs;
 209         lvfs_sbdev_type save_dev;
 210         ENTRY;
 211
 212         ping_evictor_stop();
 213
 214         if (mgs->mgs_sb == NULL)
 215                 RETURN(0);
 216         save_dev = lvfs_sbdev(mgs->mgs_sb);
 217
 218 //       lprocfs_obd_cleanup(obd);
 219
 220  //       mgs_update_server_data(obd, 1);
 221
 222         mgs_fs_cleanup(obd);
 223
 224         server_put_mount(obd->obd_name, mgs->mgs_vfsmnt);
 225         mgs->mgs_sb = NULL;
 226
 227         ldlm_namespace_free(obd->obd_namespace, obd->obd_force);
 228
 229         spin_lock_bh(&obd->obd_processing_task_lock);
 230         if (obd->obd_recovering) {
 231                 target_cancel_recovery_timer(obd);
 232                 obd->obd_recovering = 0;
 233         }
 234         spin_unlock_bh(&obd->obd_processing_task_lock);
 235
 236         lvfs_clear_rdonly(save_dev);
 237
 238         fsfilt_put_ops(obd->obd_fsops);
 239
 240         LCONSOLE_INFO("MGS %s has stopped.\n", obd->obd_name);
 241
 242         RETURN(0);
 243 }
 244
 245 static int mgs_handle_target_add(struct ptlrpc_request *req)
 246 {
 247         struct obd_device *obd = req->rq_export->exp_obd;
 248         struct mgmt_target_info *req_mti, *mti, *rep_mti;
 249         int rep_size = sizeof(*mti);
 250         int rc;
 251         ENTRY;
 252
 253         OBD_ALLOC(mti, sizeof(*mti));
 254         if (!mti)
 255                 GOTO(out, rc = -ENOMEM);
 256         req_mti = lustre_swab_reqbuf(req, 0, sizeof(*mti),
 257                                      lustre_swab_mgmt_target_info);
 258         memcpy(mti, req_mti, sizeof(*mti));
 259
 260         CDEBUG(D_MGS, "adding %s, index=%d\n", mti->mti_svname,
 261                mti->mti_stripe_index);
 262
 263         /* set the new target index if needed */
 264         if (mti->mti_flags & LDD_F_NEED_INDEX) {
 265                 rc = mgs_set_next_index(obd, mti);
 266                 if (rc) {
 267                         CERROR("Can't get index (%d)\n", rc);
 268                         GOTO(out, rc);
 269                 }
 270         }
 271
 272         /* create the log for the new target
 273            and update the client/mdt logs */
 274         rc = mgs_write_log_target(obd, mti);
 275         if (rc) {
 276                 CERROR("Failed to write %s log (%d)\n",
 277                        mti->mti_svname, rc);
 278                 GOTO(out, rc);
 279         }
 280
 281 out:
 282         lustre_pack_reply(req, 1, &rep_size, NULL);
 283         /* send back the whole mti in the reply */
 284         rep_mti = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*rep_mti));
 285         memcpy(rep_mti, mti, sizeof(*rep_mti));
 286         rep_mti->mti_rc = rc;
 287         RETURN(rc);
 288 }
 289
 290 int mgs_handle(struct ptlrpc_request *req)
 291 {
 292         int fail = OBD_FAIL_MGMT_ALL_REPLY_NET;
 293         int rc = 0;
 294         ENTRY;
 295
 296         CDEBUG(D_MGS, "MGS handle\n");
 297
 298         OBD_FAIL_RETURN(OBD_FAIL_MGMT_ALL_REQUEST_NET | OBD_FAIL_ONCE, 0);
 299
 300         LASSERT(current->journal_info == NULL);
 301         if (req->rq_reqmsg->opc != MGMT_CONNECT) {
 302                 if (req->rq_export == NULL) {
 303                         CERROR("lustre_mgs: operation %d on unconnected MGS\n",
 304                                req->rq_reqmsg->opc);
 305                         req->rq_status = -ENOTCONN;
 306                         GOTO(out, rc = -ENOTCONN);
 307                 }
 308         }
 309
 310         switch (req->rq_reqmsg->opc) {
 311         case MGMT_CONNECT:
 312                 DEBUG_REQ(D_MGS, req, "connect");
 313                 OBD_FAIL_RETURN(OBD_FAIL_MGMT_CONNECT_NET, 0);
 314                 rc = target_handle_connect(req, mgs_handle);
 315                 break;
 316         case MGMT_DISCONNECT:
 317                 DEBUG_REQ(D_MGS, req, "disconnect");
 318                 OBD_FAIL_RETURN(OBD_FAIL_MGMT_DISCONNECT_NET, 0);
 319                 rc = target_handle_disconnect(req);
 320                 req->rq_status = rc;            /* superfluous? */
 321                 break;
 322
 323         case MGMT_TARGET_ADD:
 324                 CDEBUG(D_MGS, "target add\n");
 325                 rc = mgs_handle_target_add(req);
 326                 break;
 327         case MGMT_TARGET_DEL:
 328                 CDEBUG(D_MGS, "target del\n");
 329                 //rc = mgs_handle_target_del(req);
 330                 break;
 331
 332         case LDLM_ENQUEUE:
 333                 DEBUG_REQ(D_MGS, req, "enqueue");
 334                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 335                 rc = ldlm_handle_enqueue(req, ldlm_server_completion_ast,
 336                                          ldlm_server_blocking_ast, NULL);
 337                 fail = OBD_FAIL_LDLM_REPLY;
 338                 break;
 339         case LDLM_BL_CALLBACK:
 340         case LDLM_CP_CALLBACK:
 341                 DEBUG_REQ(D_MGS, req, "callback");
 342                 CERROR("callbacks should not happen on MDS\n");
 343                 LBUG();
 344                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 345                 break;
 346
 347         case OBD_PING:
 348                 DEBUG_REQ(D_MGS, req, "ping");
 349                 rc = target_handle_ping(req);
 350                 break;
 351
 352         case OBD_LOG_CANCEL:
 353                 CDEBUG(D_MGS, "log cancel\n");
 354                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
 355                 rc = -ENOTSUPP; /* la la la */
 356                 break;
 357
 358         case LLOG_ORIGIN_HANDLE_CREATE:
 359                 DEBUG_REQ(D_MGS, req, "llog_init");
 360                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 361                 rc = llog_origin_handle_create(req);
 362                 break;
 363         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
 364                 DEBUG_REQ(D_MGS, req, "llog next block");
 365                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 366                 rc = llog_origin_handle_next_block(req);
 367                 break;
 368         case LLOG_ORIGIN_HANDLE_READ_HEADER:
 369                 DEBUG_REQ(D_MGS, req, "llog read header");
 370                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 371                 rc = llog_origin_handle_read_header(req);
 372                 break;
 373         case LLOG_ORIGIN_HANDLE_CLOSE:
 374                 DEBUG_REQ(D_MGS, req, "llog close");
 375                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 376                 rc = llog_origin_handle_close(req);
 377                 break;
 378         case LLOG_CATINFO:
 379                 DEBUG_REQ(D_MGS, req, "llog catinfo");
 380                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 381                 rc = llog_catinfo(req);
 382                 break;
 383         default:
 384                 req->rq_status = -ENOTSUPP;
 385                 rc = ptlrpc_error(req);
 386                 RETURN(rc);
 387         }
 388
 389         LASSERT(current->journal_info == NULL);
 390
 391  out:
 392         target_send_reply(req, rc, fail);
 393         RETURN(0);
 394 }
 395
 396 static int mgt_setup(struct obd_device *obd, obd_count len, void *buf)
 397 {
 398         struct mgs_obd *mgs = &obd->u.mgs;
 399         struct lprocfs_static_vars lvars;
 400         int rc = 0;
 401         ENTRY;
 402
 403        lprocfs_init_vars(mgt, &lvars);
 404        lprocfs_obd_setup(obd, lvars.obd_vars);
 405
 406         mgs->mgs_service =
 407                 ptlrpc_init_svc(MGS_NBUFS, MGS_BUFSIZE, MGS_MAXREQSIZE,
 408                                 MGS_MAXREPSIZE, MGS_REQUEST_PORTAL,
 409                                 MGC_REPLY_PORTAL, MGS_SERVICE_WATCHDOG_TIMEOUT,
 410                                 mgs_handle, "mgs", obd->obd_proc_entry, NULL,
 411                                 MGT_NUM_THREADS);
 412
 413         if (!mgs->mgs_service) {
 414                 CERROR("failed to start service\n");
 415                 GOTO(err_lprocfs, rc = -ENOMEM);
 416         }
 417
 418         rc = ptlrpc_start_threads(obd, mgs->mgs_service, "ll_mgt");
 419         if (rc)
 420                 GOTO(err_thread, rc);
 421
 422         RETURN(0);
 423
 424 err_thread:
 425         ptlrpc_unregister_service(mgs->mgs_service);
 426 err_lprocfs:
 427         lprocfs_obd_cleanup(obd);
 428         return rc;
 429 }
 430
 431
 432 static int mgt_cleanup(struct obd_device *obd)
 433 {
 434         struct mgs_obd *mgs = &obd->u.mgs;
 435         ENTRY;
 436
 437         ptlrpc_unregister_service(mgs->mgs_service);
 438
 439         lprocfs_obd_cleanup(obd);
 440
 441         RETURN(0);
 442 }
 443
 444 struct lvfs_callback_ops mgs_lvfs_ops = {
 445      //     l_fid2dentry:     mgs_lvfs_fid2dentry,
 446     //    l_open_llog:      mgs_lvfs_open_llog,
 447 };
 448
 449 /* use obd ops to offer management infrastructure */
 450 static struct obd_ops mgs_obd_ops = {
 451         .o_owner           = THIS_MODULE,
 452         .o_connect         = mgs_connect,
 453         .o_disconnect      = mgs_disconnect,
 454         .o_setup           = mgs_setup,
 455         .o_precleanup      = mgs_precleanup,
 456         .o_cleanup         = mgs_cleanup,
 457         .o_iocontrol       = mgs_iocontrol,
 458 };
 459
 460 static struct obd_ops mgt_obd_ops = {
 461         .o_owner           = THIS_MODULE,
 462         .o_setup           = mgt_setup,
 463         .o_cleanup         = mgt_cleanup,
 464 };
 465
 466 static int __init mgs_init(void)
 467 {
 468         struct lprocfs_static_vars lvars;
 469
 470         lprocfs_init_vars(mgs, &lvars);
 471         class_register_type(&mgs_obd_ops, lvars.module_vars, LUSTRE_MGS_NAME);
 472         lprocfs_init_vars(mgt, &lvars);
 473         class_register_type(&mgt_obd_ops, lvars.module_vars, LUSTRE_MGT_NAME);
 474
 475         return 0;
 476 }
 477
 478 static void /*__exit*/ mgs_exit(void)
 479 {
 480         class_unregister_type(LUSTRE_MGS_NAME);
 481         class_unregister_type(LUSTRE_MGT_NAME);
 482 }
 483
 484 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 485 MODULE_DESCRIPTION("Lustre  Management Server (MGS)");
 486 MODULE_LICENSE("GPL");
 487
 488 module_init(mgs_init);
 489 module_exit(mgs_exit);