lustre/lov/lov_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, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * Implementation of cl_device and cl_device_type for LOV layer.
  37  *
  38  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_LOV
  42
  43 /* class_name2obd() */
  44 #include <obd_class.h>
  45
  46 #include "lov_cl_internal.h"
  47
  48 struct kmem_cache *lov_lock_kmem;
  49 struct kmem_cache *lov_object_kmem;
  50 struct kmem_cache *lov_thread_kmem;
  51 struct kmem_cache *lov_session_kmem;
  52 struct kmem_cache *lov_req_kmem;
  53
  54 struct kmem_cache *lovsub_lock_kmem;
  55 struct kmem_cache *lovsub_object_kmem;
  56 struct kmem_cache *lovsub_req_kmem;
  57
  58 struct kmem_cache *lov_lock_link_kmem;
  59
  60 /** Lock class of lov_device::ld_mutex. */
  61 struct lock_class_key cl_lov_device_mutex_class;
  62
  63 struct lu_kmem_descr lov_caches[] = {
  64         {
  65                 .ckd_cache = &lov_lock_kmem,
  66                 .ckd_name  = "lov_lock_kmem",
  67                 .ckd_size  = sizeof (struct lov_lock)
  68         },
  69         {
  70                 .ckd_cache = &lov_object_kmem,
  71                 .ckd_name  = "lov_object_kmem",
  72                 .ckd_size  = sizeof (struct lov_object)
  73         },
  74         {
  75                 .ckd_cache = &lov_thread_kmem,
  76                 .ckd_name  = "lov_thread_kmem",
  77                 .ckd_size  = sizeof (struct lov_thread_info)
  78         },
  79         {
  80                 .ckd_cache = &lov_session_kmem,
  81                 .ckd_name  = "lov_session_kmem",
  82                 .ckd_size  = sizeof (struct lov_session)
  83         },
  84         {
  85                 .ckd_cache = &lov_req_kmem,
  86                 .ckd_name  = "lov_req_kmem",
  87                 .ckd_size  = sizeof (struct lov_req)
  88         },
  89         {
  90                 .ckd_cache = &lovsub_lock_kmem,
  91                 .ckd_name  = "lovsub_lock_kmem",
  92                 .ckd_size  = sizeof (struct lovsub_lock)
  93         },
  94         {
  95                 .ckd_cache = &lovsub_object_kmem,
  96                 .ckd_name  = "lovsub_object_kmem",
  97                 .ckd_size  = sizeof (struct lovsub_object)
  98         },
  99         {
 100                 .ckd_cache = &lovsub_req_kmem,
 101                 .ckd_name  = "lovsub_req_kmem",
 102                 .ckd_size  = sizeof (struct lovsub_req)
 103         },
 104         {
 105                 .ckd_cache = &lov_lock_link_kmem,
 106                 .ckd_name  = "lov_lock_link_kmem",
 107                 .ckd_size  = sizeof (struct lov_lock_link)
 108         },
 109         {
 110                 .ckd_cache = NULL
 111         }
 112 };
 113
 114 /*****************************************************************************
 115  *
 116  * Lov transfer operations.
 117  *
 118  */
 119
 120 static void lov_req_completion(const struct lu_env *env,
 121                                const struct cl_req_slice *slice, int ioret)
 122 {
 123         struct lov_req *lr;
 124
 125         ENTRY;
 126         lr = cl2lov_req(slice);
 127         OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
 128         EXIT;
 129 }
 130
 131 static const struct cl_req_operations lov_req_ops = {
 132         .cro_completion = lov_req_completion
 133 };
 134
 135 /*****************************************************************************
 136  *
 137  * Lov device and device type functions.
 138  *
 139  */
 140
 141 static void *lov_key_init(const struct lu_context *ctx,
 142                           struct lu_context_key *key)
 143 {
 144         struct lov_thread_info *info;
 145
 146         OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, GFP_NOFS);
 147         if (info == NULL)
 148                 info = ERR_PTR(-ENOMEM);
 149         return info;
 150 }
 151
 152 static void lov_key_fini(const struct lu_context *ctx,
 153                          struct lu_context_key *key, void *data)
 154 {
 155         struct lov_thread_info *info = data;
 156         OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
 157 }
 158
 159 struct lu_context_key lov_key = {
 160         .lct_tags = LCT_CL_THREAD,
 161         .lct_init = lov_key_init,
 162         .lct_fini = lov_key_fini
 163 };
 164
 165 static void *lov_session_key_init(const struct lu_context *ctx,
 166                                   struct lu_context_key *key)
 167 {
 168         struct lov_session *info;
 169
 170         OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
 171         if (info == NULL)
 172                 info = ERR_PTR(-ENOMEM);
 173         return info;
 174 }
 175
 176 static void lov_session_key_fini(const struct lu_context *ctx,
 177                                  struct lu_context_key *key, void *data)
 178 {
 179         struct lov_session *info = data;
 180         OBD_SLAB_FREE_PTR(info, lov_session_kmem);
 181 }
 182
 183 struct lu_context_key lov_session_key = {
 184         .lct_tags = LCT_SESSION,
 185         .lct_init = lov_session_key_init,
 186         .lct_fini = lov_session_key_fini
 187 };
 188
 189 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
 190 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
 191
 192 static struct lu_device *lov_device_fini(const struct lu_env *env,
 193                                          struct lu_device *d)
 194 {
 195         int i;
 196         struct lov_device *ld = lu2lov_dev(d);
 197
 198         LASSERT(ld->ld_lov != NULL);
 199         if (ld->ld_target == NULL)
 200                 RETURN(NULL);
 201
 202         lov_foreach_target(ld, i) {
 203                 struct lovsub_device *lsd;
 204
 205                 lsd = ld->ld_target[i];
 206                 if (lsd != NULL) {
 207                         cl_stack_fini(env, lovsub2cl_dev(lsd));
 208                         ld->ld_target[i] = NULL;
 209                 }
 210         }
 211         RETURN(NULL);
 212 }
 213
 214 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
 215                            const char *name, struct lu_device *next)
 216 {
 217         struct lov_device *ld = lu2lov_dev(d);
 218         int i;
 219         int rc = 0;
 220
 221         LASSERT(d->ld_site != NULL);
 222         if (ld->ld_target == NULL)
 223                 RETURN(rc);
 224
 225         lov_foreach_target(ld, i) {
 226                 struct lovsub_device *lsd;
 227                 struct cl_device     *cl;
 228                 struct lov_tgt_desc  *desc;
 229
 230                 desc = ld->ld_lov->lov_tgts[i];
 231                 if (desc == NULL)
 232                         continue;
 233
 234                 cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
 235                                    desc->ltd_obd->obd_lu_dev);
 236                 if (IS_ERR(cl)) {
 237                         rc = PTR_ERR(cl);
 238                         break;
 239                 }
 240                 lsd = cl2lovsub_dev(cl);
 241                 lsd->acid_idx = i;
 242                 lsd->acid_super = ld;
 243                 ld->ld_target[i] = lsd;
 244         }
 245
 246         if (rc)
 247                 lov_device_fini(env, d);
 248         else
 249                 ld->ld_flags |= LOV_DEV_INITIALIZED;
 250
 251         RETURN(rc);
 252 }
 253
 254 static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
 255                         struct cl_req *req)
 256 {
 257         struct lov_req *lr;
 258         int result;
 259
 260         ENTRY;
 261         OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, GFP_NOFS);
 262         if (lr != NULL) {
 263                 cl_req_slice_add(req, &lr->lr_cl, dev, &lov_req_ops);
 264                 result = 0;
 265         } else
 266                 result = -ENOMEM;
 267         RETURN(result);
 268 }
 269
 270 static const struct cl_device_operations lov_cl_ops = {
 271         .cdo_req_init = lov_req_init
 272 };
 273
 274 static void lov_emerg_free(struct lov_device_emerg **emrg, int nr)
 275 {
 276         int i;
 277
 278         for (i = 0; i < nr; ++i) {
 279                 struct lov_device_emerg *em;
 280
 281                 em = emrg[i];
 282                 if (em != NULL) {
 283                         LASSERT(em->emrg_page_list.pl_nr == 0);
 284                         if (em->emrg_env != NULL)
 285                                 cl_env_put(em->emrg_env, &em->emrg_refcheck);
 286                         OBD_FREE_PTR(em);
 287                 }
 288         }
 289         OBD_FREE(emrg, nr * sizeof emrg[0]);
 290 }
 291
 292 static struct lu_device *lov_device_free(const struct lu_env *env,
 293                                          struct lu_device *d)
 294 {
 295         struct lov_device *ld = lu2lov_dev(d);
 296         const int          nr = ld->ld_target_nr;
 297
 298         cl_device_fini(lu2cl_dev(d));
 299         if (ld->ld_target != NULL)
 300                 OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
 301         if (ld->ld_emrg != NULL)
 302                 lov_emerg_free(ld->ld_emrg, nr);
 303         OBD_FREE_PTR(ld);
 304         return NULL;
 305 }
 306
 307 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
 308                               __u32 index)
 309 {
 310         struct lov_device *ld = lu2lov_dev(dev);
 311         ENTRY;
 312
 313         if (ld->ld_target[index] != NULL) {
 314                 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
 315                 ld->ld_target[index] = NULL;
 316         }
 317         EXIT;
 318 }
 319
 320 static struct lov_device_emerg **lov_emerg_alloc(int nr)
 321 {
 322         struct lov_device_emerg **emerg;
 323         int i;
 324         int result;
 325
 326         OBD_ALLOC(emerg, nr * sizeof emerg[0]);
 327         if (emerg == NULL)
 328                 return ERR_PTR(-ENOMEM);
 329         for (result = i = 0; i < nr && result == 0; i++) {
 330                 struct lov_device_emerg *em;
 331
 332                 OBD_ALLOC_PTR(em);
 333                 if (em != NULL) {
 334                         emerg[i] = em;
 335                         cl_page_list_init(&em->emrg_page_list);
 336                         em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
 337                                                     LCT_REMEMBER|LCT_NOREF);
 338                         if (!IS_ERR(em->emrg_env))
 339                                 em->emrg_env->le_ctx.lc_cookie = 0x2;
 340                         else {
 341                                 result = PTR_ERR(em->emrg_env);
 342                                 em->emrg_env = NULL;
 343                         }
 344                 } else
 345                         result = -ENOMEM;
 346         }
 347         if (result != 0) {
 348                 lov_emerg_free(emerg, nr);
 349                 emerg = ERR_PTR(result);
 350         }
 351         return emerg;
 352 }
 353
 354 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
 355 {
 356         int   result;
 357         __u32 tgt_size;
 358         __u32 sub_size;
 359
 360         ENTRY;
 361         result = 0;
 362         tgt_size = dev->ld_lov->lov_tgt_size;
 363         sub_size = dev->ld_target_nr;
 364         if (sub_size < tgt_size) {
 365                 struct lovsub_device    **newd;
 366                 struct lov_device_emerg **emerg;
 367                 const size_t              sz   = sizeof newd[0];
 368
 369                 emerg = lov_emerg_alloc(tgt_size);
 370                 if (IS_ERR(emerg))
 371                         RETURN(PTR_ERR(emerg));
 372
 373                 OBD_ALLOC(newd, tgt_size * sz);
 374                 if (newd != NULL) {
 375                         mutex_lock(&dev->ld_mutex);
 376                         if (sub_size > 0) {
 377                                 memcpy(newd, dev->ld_target, sub_size * sz);
 378                                 OBD_FREE(dev->ld_target, sub_size * sz);
 379                         }
 380                         dev->ld_target    = newd;
 381                         dev->ld_target_nr = tgt_size;
 382
 383                         if (dev->ld_emrg != NULL)
 384                                 lov_emerg_free(dev->ld_emrg, sub_size);
 385                         dev->ld_emrg = emerg;
 386                         mutex_unlock(&dev->ld_mutex);
 387                 } else {
 388                         lov_emerg_free(emerg, tgt_size);
 389                         result = -ENOMEM;
 390                 }
 391         }
 392         RETURN(result);
 393 }
 394
 395 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
 396                              __u32 index)
 397 {
 398         struct obd_device    *obd = dev->ld_obd;
 399         struct lov_device    *ld  = lu2lov_dev(dev);
 400         struct lov_tgt_desc  *tgt;
 401         struct lovsub_device *lsd;
 402         struct cl_device     *cl;
 403         int rc;
 404         ENTRY;
 405
 406         obd_getref(obd);
 407
 408         tgt = obd->u.lov.lov_tgts[index];
 409         LASSERT(tgt != NULL);
 410         LASSERT(tgt->ltd_obd != NULL);
 411
 412         if (!tgt->ltd_obd->obd_set_up) {
 413                 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
 414                 RETURN(-EINVAL);
 415         }
 416
 417         rc = lov_expand_targets(env, ld);
 418         if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
 419                 LASSERT(dev->ld_site != NULL);
 420
 421                 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
 422                                    tgt->ltd_obd->obd_lu_dev);
 423                 if (!IS_ERR(cl)) {
 424                         lsd = cl2lovsub_dev(cl);
 425                         lsd->acid_idx = index;
 426                         lsd->acid_super = ld;
 427                         ld->ld_target[index] = lsd;
 428                 } else {
 429                         CERROR("add failed (%d), deleting %s\n", rc,
 430                                obd_uuid2str(&tgt->ltd_uuid));
 431                         lov_cl_del_target(env, dev, index);
 432                         rc = PTR_ERR(cl);
 433                 }
 434         }
 435         obd_putref(obd);
 436         RETURN(rc);
 437 }
 438
 439 static int lov_process_config(const struct lu_env *env,
 440                               struct lu_device *d, struct lustre_cfg *cfg)
 441 {
 442         struct obd_device *obd = d->ld_obd;
 443         int cmd;
 444         int rc;
 445         int gen;
 446         __u32 index;
 447
 448         obd_getref(obd);
 449
 450         cmd = cfg->lcfg_command;
 451         rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
 452         if (rc == 0) {
 453                 switch(cmd) {
 454                 case LCFG_LOV_ADD_OBD:
 455                 case LCFG_LOV_ADD_INA:
 456                         rc = lov_cl_add_target(env, d, index);
 457                         if (rc != 0)
 458                                 lov_del_target(d->ld_obd, index, 0, 0);
 459                         break;
 460                 case LCFG_LOV_DEL_OBD:
 461                         lov_cl_del_target(env, d, index);
 462                         break;
 463                 }
 464         }
 465         obd_putref(obd);
 466         RETURN(rc);
 467 }
 468
 469 static const struct lu_device_operations lov_lu_ops = {
 470         .ldo_object_alloc      = lov_object_alloc,
 471         .ldo_process_config    = lov_process_config,
 472 };
 473
 474 static struct lu_device *lov_device_alloc(const struct lu_env *env,
 475                                           struct lu_device_type *t,
 476                                           struct lustre_cfg *cfg)
 477 {
 478         struct lu_device *d;
 479         struct lov_device *ld;
 480         struct obd_device *obd;
 481         int rc;
 482
 483         OBD_ALLOC_PTR(ld);
 484         if (ld == NULL)
 485                 RETURN(ERR_PTR(-ENOMEM));
 486
 487         cl_device_init(&ld->ld_cl, t);
 488         d = lov2lu_dev(ld);
 489         d->ld_ops        = &lov_lu_ops;
 490         ld->ld_cl.cd_ops = &lov_cl_ops;
 491
 492         mutex_init(&ld->ld_mutex);
 493         lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
 494
 495         /* setup the LOV OBD */
 496         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 497         LASSERT(obd != NULL);
 498         rc = lov_setup(obd, cfg);
 499         if (rc) {
 500                 lov_device_free(env, d);
 501                 RETURN(ERR_PTR(rc));
 502         }
 503
 504         ld->ld_lov = &obd->u.lov;
 505         RETURN(d);
 506 }
 507
 508 static const struct lu_device_type_operations lov_device_type_ops = {
 509         .ldto_init = lov_type_init,
 510         .ldto_fini = lov_type_fini,
 511
 512         .ldto_start = lov_type_start,
 513         .ldto_stop  = lov_type_stop,
 514
 515         .ldto_device_alloc = lov_device_alloc,
 516         .ldto_device_free  = lov_device_free,
 517
 518         .ldto_device_init    = lov_device_init,
 519         .ldto_device_fini    = lov_device_fini
 520 };
 521
 522 struct lu_device_type lov_device_type = {
 523         .ldt_tags     = LU_DEVICE_CL,
 524         .ldt_name     = LUSTRE_LOV_NAME,
 525         .ldt_ops      = &lov_device_type_ops,
 526         .ldt_ctx_tags = LCT_CL_THREAD
 527 };
 528 EXPORT_SYMBOL(lov_device_type);
 529
 530 /** @} lov */