lustre/osp/lwp_dev.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, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2013, Intel Corporation.
  25  * Use is subject to license terms.
  26  *
  27  * lustre/osp/lwp_dev.c
  28  *
  29  * Light Weight Proxy, which is just for managing the connection established
  30  * from OSTs/MDTs to MDT0.
  31  *
  32  * Author: <di.wang@intel.com>
  33  * Author: <yawei.niu@intel.com>
  34  */
  35 #define DEBUG_SUBSYSTEM S_OST
  36
  37 #include <obd_class.h>
  38 #include <lustre_param.h>
  39 #include <lustre_log.h>
  40 #include <libcfs/libcfs_string.h>
  41
  42 struct lwp_device {
  43         struct lu_device        lpd_dev;
  44         struct obd_device       *lpd_obd;
  45         struct obd_uuid         lpd_cluuid;
  46         struct obd_export       *lpd_exp;
  47         int                     lpd_connects;
  48 };
  49
  50 static inline struct lwp_device *lu2lwp_dev(struct lu_device *d)
  51 {
  52         return container_of0(d, struct lwp_device, lpd_dev);
  53 }
  54
  55 static inline struct lu_device *lwp2lu_dev(struct lwp_device *d)
  56 {
  57         return &d->lpd_dev;
  58 }
  59
  60 static int lwp_setup(const struct lu_env *env, struct lwp_device *lwp,
  61                      char *nidstring)
  62 {
  63         struct lustre_cfg_bufs  *bufs = NULL;
  64         struct lustre_cfg       *lcfg = NULL;
  65         char                    *lwp_name = lwp->lpd_obd->obd_name;
  66         char                    *server_uuid = NULL;
  67         char                    *ptr;
  68         class_uuid_t             uuid;
  69         struct obd_import       *imp;
  70         int                      len = strlen(lwp_name);
  71         int                      rc;
  72         ENTRY;
  73
  74         OBD_ALLOC_PTR(bufs);
  75         if (bufs == NULL)
  76                 RETURN(-ENOMEM);
  77
  78         OBD_ALLOC(server_uuid, len);
  79         if (server_uuid == NULL)
  80                 GOTO(out, rc = -ENOMEM);
  81
  82         snprintf(server_uuid, len, "-%s-", LUSTRE_LWP_NAME);
  83         ptr = cfs_strrstr(lwp_name, server_uuid);
  84         if (ptr == NULL) {
  85                 CERROR("%s: failed to get server_uuid from lwp_name: rc = %d\n",
  86                        lwp_name, -EINVAL);
  87                 GOTO(out, rc = -EINVAL);
  88         }
  89
  90         strncpy(server_uuid, lwp_name, ptr - lwp_name);
  91         server_uuid[ptr - lwp_name] = '\0';
  92         strncat(server_uuid, "_UUID", len - 1);
  93         lustre_cfg_bufs_reset(bufs, lwp_name);
  94         lustre_cfg_bufs_set_string(bufs, 1, server_uuid);
  95         lustre_cfg_bufs_set_string(bufs, 2, nidstring);
  96         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
  97         if (lcfg == NULL)
  98                 GOTO(out, rc = -ENOMEM);
  99
 100         rc = client_obd_setup(lwp->lpd_obd, lcfg);
 101         if (rc != 0) {
 102                 CERROR("%s: client obd setup error: rc = %d\n",
 103                        lwp->lpd_obd->obd_name, rc);
 104                 GOTO(out, rc);
 105         }
 106
 107         imp = lwp->lpd_obd->u.cli.cl_import;
 108         rc = ptlrpc_init_import(imp);
 109         if (rc)
 110                 GOTO(out, rc);
 111
 112         ll_generate_random_uuid(uuid);
 113         class_uuid_unparse(uuid, &lwp->lpd_cluuid);
 114 out:
 115         if (bufs != NULL)
 116                 OBD_FREE_PTR(bufs);
 117         if (server_uuid != NULL)
 118                 OBD_FREE(server_uuid, len);
 119         if (lcfg != NULL)
 120                 lustre_cfg_free(lcfg);
 121         if (rc)
 122                 client_obd_cleanup(lwp->lpd_obd);
 123
 124         RETURN(rc);
 125 }
 126
 127 static int lwp_disconnect(struct lwp_device *d)
 128 {
 129         struct obd_import *imp;
 130         int rc = 0;
 131
 132         imp = d->lpd_obd->u.cli.cl_import;
 133
 134         /* Mark import deactivated now, so we don't try to reconnect if any
 135          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 136          * fully deactivate the import, or that would drop all requests. */
 137         LASSERT(imp != NULL);
 138         spin_lock(&imp->imp_lock);
 139         imp->imp_deactive = 1;
 140         spin_unlock(&imp->imp_lock);
 141
 142         ptlrpc_deactivate_import(imp);
 143
 144         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 145          * delete it regardless.  (It's safe to delete an import that was
 146          * never added.) */
 147         ptlrpc_pinger_del_import(imp);
 148         rc = ptlrpc_disconnect_import(imp, 0);
 149         if (rc != 0)
 150                 CWARN("%s: can't disconnect: rc = %d\n",
 151                       d->lpd_obd->obd_name, rc);
 152
 153         ptlrpc_invalidate_import(imp);
 154
 155         RETURN(rc);
 156 }
 157
 158 static int lwp_process_config(const struct lu_env *env,
 159                               struct lu_device *dev, struct lustre_cfg *lcfg)
 160 {
 161         struct lwp_device               *d = lu2lwp_dev(dev);
 162         int                              rc;
 163         ENTRY;
 164
 165         switch (lcfg->lcfg_command) {
 166         case LCFG_PRE_CLEANUP:
 167         case LCFG_CLEANUP:
 168                 rc = lwp_disconnect(d);
 169                 break;
 170         case LCFG_PARAM:
 171                 rc = -ENOSYS;
 172                 break;
 173         default:
 174                 CERROR("%s: unknown command %u\n",
 175                        (char *)lustre_cfg_string(lcfg, 0), lcfg->lcfg_command);
 176                 rc = 0;
 177                 break;
 178         }
 179
 180         RETURN(rc);
 181 }
 182
 183 const struct lu_device_operations lwp_lu_ops = {
 184         .ldo_process_config     = lwp_process_config,
 185 };
 186
 187 int lwp_init0(const struct lu_env *env, struct lwp_device *lwp,
 188               struct lu_device_type *ldt, struct lustre_cfg *cfg)
 189 {
 190         int                        rc;
 191         ENTRY;
 192
 193         lwp->lpd_obd = class_name2obd(lustre_cfg_string(cfg, 0));
 194         if (lwp->lpd_obd == NULL) {
 195                 CERROR("Cannot find obd with name %s\n",
 196                        lustre_cfg_string(cfg, 0));
 197                 RETURN(-ENODEV);
 198         }
 199
 200         lwp->lpd_dev.ld_ops = &lwp_lu_ops;
 201         lwp->lpd_obd->obd_lu_dev = &lwp->lpd_dev;
 202
 203         rc = ptlrpcd_addref();
 204         if (rc) {
 205                 CERROR("%s: ptlrpcd addref error: rc =%d\n",
 206                        lwp->lpd_obd->obd_name, rc);
 207                 RETURN(rc);
 208         }
 209
 210         rc = lwp_setup(env, lwp, lustre_cfg_string(cfg, 1));
 211         if (rc) {
 212                 CERROR("%s: setup lwp failed. %d\n",
 213                        lwp->lpd_obd->obd_name, rc);
 214                 ptlrpcd_decref();
 215                 RETURN(rc);
 216         }
 217
 218         if (lprocfs_seq_obd_setup(lwp->lpd_obd) == 0)
 219                 ptlrpc_lprocfs_register_obd(lwp->lpd_obd);
 220
 221         RETURN(0);
 222 }
 223
 224 static struct lu_device *lwp_device_free(const struct lu_env *env,
 225                                          struct lu_device *lu)
 226 {
 227         struct lwp_device *m = lu2lwp_dev(lu);
 228         ENTRY;
 229
 230         if (atomic_read(&lu->ld_ref) && lu->ld_site) {
 231                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
 232                 lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer);
 233         }
 234         lu_device_fini(&m->lpd_dev);
 235         OBD_FREE_PTR(m);
 236         RETURN(NULL);
 237 }
 238
 239 static struct lu_device *lwp_device_alloc(const struct lu_env *env,
 240                                           struct lu_device_type *t,
 241                                           struct lustre_cfg *lcfg)
 242 {
 243         struct lwp_device *lwp;
 244         struct lu_device  *l;
 245
 246         OBD_ALLOC_PTR(lwp);
 247         if (lwp == NULL) {
 248                 l = ERR_PTR(-ENOMEM);
 249         } else {
 250                 int rc;
 251
 252                 l = lwp2lu_dev(lwp);
 253                 lu_device_init(&lwp->lpd_dev, t);
 254                 rc = lwp_init0(env, lwp, t, lcfg);
 255                 if (rc != 0) {
 256                         lwp_device_free(env, l);
 257                         l = ERR_PTR(rc);
 258                 }
 259         }
 260         return l;
 261 }
 262
 263
 264 static struct lu_device *lwp_device_fini(const struct lu_env *env,
 265                                          struct lu_device *d)
 266 {
 267         struct lwp_device *m = lu2lwp_dev(d);
 268         struct obd_import *imp;
 269         int                rc;
 270         ENTRY;
 271
 272         if (m->lpd_exp != NULL)
 273                 class_disconnect(m->lpd_exp);
 274
 275         imp = m->lpd_obd->u.cli.cl_import;
 276
 277         if (imp->imp_rq_pool) {
 278                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 279                 imp->imp_rq_pool = NULL;
 280         }
 281
 282         LASSERT(m->lpd_obd);
 283         ptlrpc_lprocfs_unregister_obd(m->lpd_obd);
 284         lprocfs_obd_cleanup(m->lpd_obd);
 285
 286         rc = client_obd_cleanup(m->lpd_obd);
 287         LASSERTF(rc == 0, "error %d\n", rc);
 288
 289         ptlrpcd_decref();
 290
 291         RETURN(NULL);
 292 }
 293
 294 static struct lu_device_type_operations lwp_device_type_ops = {
 295         .ldto_device_alloc   = lwp_device_alloc,
 296         .ldto_device_free    = lwp_device_free,
 297         .ldto_device_fini    = lwp_device_fini
 298 };
 299
 300 struct lu_device_type lwp_device_type = {
 301         .ldt_tags     = LU_DEVICE_DT,
 302         .ldt_name     = LUSTRE_LWP_NAME,
 303         .ldt_ops      = &lwp_device_type_ops,
 304         .ldt_ctx_tags = LCT_MD_THREAD
 305 };
 306
 307 static int lwp_obd_connect(const struct lu_env *env, struct obd_export **exp,
 308                            struct obd_device *obd, struct obd_uuid *cluuid,
 309                            struct obd_connect_data *data, void *localdata)
 310 {
 311         struct lwp_device       *lwp = lu2lwp_dev(obd->obd_lu_dev);
 312         struct client_obd       *cli = &lwp->lpd_obd->u.cli;
 313         struct obd_import       *imp = cli->cl_import;
 314         struct obd_connect_data *ocd;
 315         struct lustre_handle     conn;
 316         int                      rc;
 317
 318         ENTRY;
 319
 320         CDEBUG(D_CONFIG, "connect #%d\n", lwp->lpd_connects);
 321
 322         *exp = NULL;
 323         down_write(&cli->cl_sem);
 324         rc = class_connect(&conn, obd, cluuid);
 325         if (rc != 0)
 326                 GOTO(out_sem, rc);
 327
 328         *exp = class_conn2export(&conn);
 329         lwp->lpd_exp = *exp;
 330
 331         /* Why should there ever be more than 1 connect? */
 332         lwp->lpd_connects++;
 333         LASSERT(lwp->lpd_connects == 1);
 334
 335         imp->imp_dlm_handle = conn;
 336         rc = ptlrpc_init_import(imp);
 337         if (rc != 0)
 338                 GOTO(out_dis, rc);
 339
 340         LASSERT(data != NULL);
 341         ocd = &imp->imp_connect_data;
 342         *ocd = *data;
 343
 344         LASSERT(ocd->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT);
 345
 346         ocd->ocd_version = LUSTRE_VERSION_CODE;
 347         imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
 348
 349         rc = ptlrpc_connect_import(imp);
 350         if (rc != 0) {
 351                 CERROR("%s: can't connect obd: rc = %d\n", obd->obd_name, rc);
 352                 GOTO(out_dis, rc);
 353         }
 354
 355         ptlrpc_pinger_add_import(imp);
 356
 357         GOTO(out_dis, rc = 0);
 358
 359 out_dis:
 360         if (rc != 0) {
 361                 class_disconnect(*exp);
 362                 *exp = NULL;
 363                 lwp->lpd_exp = NULL;
 364         }
 365
 366 out_sem:
 367         up_write(&cli->cl_sem);
 368
 369         return rc;
 370 }
 371
 372 static int lwp_obd_disconnect(struct obd_export *exp)
 373 {
 374         struct obd_device *obd = exp->exp_obd;
 375         struct lwp_device *lwp = lu2lwp_dev(obd->obd_lu_dev);
 376         int                rc;
 377         ENTRY;
 378
 379         /* Only disconnect the underlying layers on the final disconnect. */
 380         LASSERT(lwp->lpd_connects == 1);
 381         lwp->lpd_connects--;
 382
 383         rc = class_disconnect(exp);
 384         if (rc)
 385                 CERROR("%s: class disconnect error: rc = %d\n",
 386                        obd->obd_name, rc);
 387
 388         RETURN(rc);
 389 }
 390
 391 static int lwp_import_event(struct obd_device *obd, struct obd_import *imp,
 392                             enum obd_import_event event)
 393 {
 394         switch (event) {
 395         case IMP_EVENT_DISCON:
 396         case IMP_EVENT_INACTIVE:
 397         case IMP_EVENT_ACTIVE:
 398                 break;
 399         case IMP_EVENT_INVALIDATE:
 400                 if (obd->obd_namespace == NULL)
 401                         break;
 402                 ldlm_namespace_cleanup(obd->obd_namespace, LDLM_FL_LOCAL_ONLY);
 403                 break;
 404         case IMP_EVENT_OCD:
 405                 break;
 406         default:
 407                 CERROR("%s: unsupported import event: %#x\n",
 408                        obd->obd_name, event);
 409         }
 410         return 0;
 411 }
 412
 413 struct obd_ops lwp_obd_device_ops = {
 414         .o_owner        = THIS_MODULE,
 415         .o_add_conn     = client_import_add_conn,
 416         .o_del_conn     = client_import_del_conn,
 417         .o_connect      = lwp_obd_connect,
 418         .o_disconnect   = lwp_obd_disconnect,
 419         .o_import_event = lwp_import_event,
 420 };