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