lustre/lov/lov_dev.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  30  * Use is subject to license terms.
  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 cfs_mem_cache_t *lov_page_kmem;
  49 cfs_mem_cache_t *lov_lock_kmem;
  50 cfs_mem_cache_t *lov_object_kmem;
  51 cfs_mem_cache_t *lov_thread_kmem;
  52 cfs_mem_cache_t *lov_session_kmem;
  53 cfs_mem_cache_t *lov_req_kmem;
  54
  55 cfs_mem_cache_t *lovsub_page_kmem;
  56 cfs_mem_cache_t *lovsub_lock_kmem;
  57 cfs_mem_cache_t *lovsub_object_kmem;
  58 cfs_mem_cache_t *lovsub_req_kmem;
  59
  60 cfs_mem_cache_t *lov_lock_link_kmem;
  61
  62 /** Lock class of lov_device::ld_mutex. */
  63 struct lock_class_key cl_lov_device_mutex_class;
  64
  65 struct lu_kmem_descr lov_caches[] = {
  66         {
  67                 .ckd_cache = &lov_page_kmem,
  68                 .ckd_name  = "lov_page_kmem",
  69                 .ckd_size  = sizeof (struct lov_page)
  70         },
  71         {
  72                 .ckd_cache = &lov_lock_kmem,
  73                 .ckd_name  = "lov_lock_kmem",
  74                 .ckd_size  = sizeof (struct lov_lock)
  75         },
  76         {
  77                 .ckd_cache = &lov_object_kmem,
  78                 .ckd_name  = "lov_object_kmem",
  79                 .ckd_size  = sizeof (struct lov_object)
  80         },
  81         {
  82                 .ckd_cache = &lov_thread_kmem,
  83                 .ckd_name  = "lov_thread_kmem",
  84                 .ckd_size  = sizeof (struct lov_thread_info)
  85         },
  86         {
  87                 .ckd_cache = &lov_session_kmem,
  88                 .ckd_name  = "lov_session_kmem",
  89                 .ckd_size  = sizeof (struct lov_session)
  90         },
  91         {
  92                 .ckd_cache = &lov_req_kmem,
  93                 .ckd_name  = "lov_req_kmem",
  94                 .ckd_size  = sizeof (struct lov_req)
  95         },
  96         {
  97                 .ckd_cache = &lovsub_page_kmem,
  98                 .ckd_name  = "lovsub_page_kmem",
  99                 .ckd_size  = sizeof (struct lovsub_page)
 100         },
 101         {
 102                 .ckd_cache = &lovsub_lock_kmem,
 103                 .ckd_name  = "lovsub_lock_kmem",
 104                 .ckd_size  = sizeof (struct lovsub_lock)
 105         },
 106         {
 107                 .ckd_cache = &lovsub_object_kmem,
 108                 .ckd_name  = "lovsub_object_kmem",
 109                 .ckd_size  = sizeof (struct lovsub_object)
 110         },
 111         {
 112                 .ckd_cache = &lovsub_req_kmem,
 113                 .ckd_name  = "lovsub_req_kmem",
 114                 .ckd_size  = sizeof (struct lovsub_req)
 115         },
 116         {
 117                 .ckd_cache = &lov_lock_link_kmem,
 118                 .ckd_name  = "lov_lock_link_kmem",
 119                 .ckd_size  = sizeof (struct lov_lock_link)
 120         },
 121         {
 122                 .ckd_cache = NULL
 123         }
 124 };
 125
 126 /*****************************************************************************
 127  *
 128  * Lov transfer operations.
 129  *
 130  */
 131
 132 static void lov_req_completion(const struct lu_env *env,
 133                                const struct cl_req_slice *slice, int ioret)
 134 {
 135         struct lov_req *lr;
 136
 137         ENTRY;
 138         lr = cl2lov_req(slice);
 139         OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
 140         EXIT;
 141 }
 142
 143 static const struct cl_req_operations lov_req_ops = {
 144         .cro_completion = lov_req_completion
 145 };
 146
 147 /*****************************************************************************
 148  *
 149  * Lov device and device type functions.
 150  *
 151  */
 152
 153 static void *lov_key_init(const struct lu_context *ctx,
 154                           struct lu_context_key *key)
 155 {
 156         struct lov_thread_info *info;
 157
 158         OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, CFS_ALLOC_IO);
 159         if (info != NULL)
 160                 CFS_INIT_LIST_HEAD(&info->lti_closure.clc_list);
 161         else
 162                 info = ERR_PTR(-ENOMEM);
 163         return info;
 164 }
 165
 166 static void lov_key_fini(const struct lu_context *ctx,
 167                          struct lu_context_key *key, void *data)
 168 {
 169         struct lov_thread_info *info = data;
 170         LINVRNT(list_empty(&info->lti_closure.clc_list));
 171         OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
 172 }
 173
 174 struct lu_context_key lov_key = {
 175         .lct_tags = LCT_CL_THREAD,
 176         .lct_init = lov_key_init,
 177         .lct_fini = lov_key_fini
 178 };
 179
 180 static void *lov_session_key_init(const struct lu_context *ctx,
 181                                   struct lu_context_key *key)
 182 {
 183         struct lov_session *info;
 184
 185         OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, CFS_ALLOC_IO);
 186         if (info == NULL)
 187                 info = ERR_PTR(-ENOMEM);
 188         return info;
 189 }
 190
 191 static void lov_session_key_fini(const struct lu_context *ctx,
 192                                  struct lu_context_key *key, void *data)
 193 {
 194         struct lov_session *info = data;
 195         OBD_SLAB_FREE_PTR(info, lov_session_kmem);
 196 }
 197
 198 struct lu_context_key lov_session_key = {
 199         .lct_tags = LCT_SESSION,
 200         .lct_init = lov_session_key_init,
 201         .lct_fini = lov_session_key_fini
 202 };
 203
 204 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
 205 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
 206
 207 static struct lu_device *lov_device_fini(const struct lu_env *env,
 208                                          struct lu_device *d)
 209 {
 210         int i;
 211         struct lov_device *ld = lu2lov_dev(d);
 212
 213         LASSERT(ld->ld_lov != NULL);
 214         if (ld->ld_target == NULL)
 215                 RETURN(NULL);
 216
 217         lov_foreach_target(ld, i) {
 218                 struct lovsub_device *lsd;
 219
 220                 lsd = ld->ld_target[i];
 221                 if (lsd != NULL) {
 222                         cl_stack_fini(env, lovsub2cl_dev(lsd));
 223                         ld->ld_target[i] = NULL;
 224                 }
 225         }
 226         RETURN(NULL);
 227 }
 228
 229 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
 230                            const char *name, struct lu_device *next)
 231 {
 232         struct lov_device *ld = lu2lov_dev(d);
 233         int i;
 234         int rc = 0;
 235
 236         LASSERT(d->ld_site != NULL);
 237         if (ld->ld_target == NULL)
 238                 RETURN(rc);
 239
 240         lov_foreach_target(ld, i) {
 241                 struct lovsub_device *lsd;
 242                 struct cl_device     *cl;
 243                 struct lov_tgt_desc  *desc;
 244
 245                 desc = ld->ld_lov->lov_tgts[i];
 246                 if (desc->ltd_active) {
 247                         cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
 248                                            desc->ltd_exp->exp_obd->obd_lu_dev);
 249                         if (IS_ERR(cl)) {
 250                                 rc = PTR_ERR(cl);
 251                                 break;
 252                         }
 253                         lsd = cl2lovsub_dev(cl);
 254                         lsd->acid_idx = i;
 255                         lsd->acid_super = ld;
 256                         ld->ld_target[i] = lsd;
 257                 }
 258         }
 259
 260         if (rc)
 261                 lov_device_fini(env, d);
 262         else
 263                 ld->ld_flags |= LOV_DEV_INITIALIZED;
 264
 265         RETURN(rc);
 266 }
 267
 268 static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
 269                         struct cl_req *req)
 270 {
 271         struct lov_req *lr;
 272         int result;
 273
 274         ENTRY;
 275         OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, CFS_ALLOC_IO);
 276         if (lr != NULL) {
 277                 cl_req_slice_add(req, &lr->lr_cl, dev, &lov_req_ops);
 278                 result = 0;
 279         } else
 280                 result = -ENOMEM;
 281         RETURN(result);
 282 }
 283
 284 static const struct cl_device_operations lov_cl_ops = {
 285         .cdo_req_init = lov_req_init
 286 };
 287
 288 static void lov_emerg_free(struct lov_device_emerg **emrg, int nr)
 289 {
 290         int i;
 291
 292         for (i = 0; i < nr; ++i) {
 293                 struct lov_device_emerg *em;
 294
 295                 em = emrg[i];
 296                 if (em != NULL) {
 297                         LASSERT(em->emrg_page_list.pl_nr == 0);
 298                         if (em->emrg_env != NULL)
 299                                 cl_env_put(em->emrg_env, &em->emrg_refcheck);
 300                         OBD_FREE_PTR(em);
 301                 }
 302         }
 303         OBD_FREE(emrg, nr * sizeof emrg[0]);
 304 }
 305
 306 static struct lu_device *lov_device_free(const struct lu_env *env,
 307                                          struct lu_device *d)
 308 {
 309         struct lov_device *ld = lu2lov_dev(d);
 310         const int          nr = ld->ld_target_nr;
 311
 312         cl_device_fini(lu2cl_dev(d));
 313         if (ld->ld_target != NULL)
 314                 OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
 315         if (ld->ld_emrg != NULL)
 316                 lov_emerg_free(ld->ld_emrg, nr);
 317         OBD_FREE_PTR(ld);
 318         return NULL;
 319 }
 320
 321 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
 322                               __u32 index)
 323 {
 324         struct lov_device *ld = lu2lov_dev(dev);
 325         ENTRY;
 326
 327         if (ld->ld_target[index] != NULL) {
 328                 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
 329                 ld->ld_target[index] = NULL;
 330         }
 331         EXIT;
 332 }
 333
 334 static struct lov_device_emerg **lov_emerg_alloc(int nr)
 335 {
 336         struct lov_device_emerg **emerg;
 337         int i;
 338         int result;
 339
 340         OBD_ALLOC(emerg, nr * sizeof emerg[0]);
 341         if (emerg == NULL)
 342                 return ERR_PTR(-ENOMEM);
 343         for (result = i = 0; i < nr && result == 0; i++) {
 344                 struct lov_device_emerg *em;
 345                 void *cookie;
 346
 347                 OBD_ALLOC_PTR(em);
 348                 if (em != NULL) {
 349                         emerg[i] = em;
 350                         cl_page_list_init(&em->emrg_page_list);
 351                         cookie = cl_env_reenter();
 352                         em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
 353                                                     LCT_REMEMBER|LCT_NOREF);
 354                         cl_env_reexit(cookie);
 355                         if (!IS_ERR(em->emrg_env))
 356                                 em->emrg_env->le_ctx.lc_cookie = 0x2;
 357                         else {
 358                                 result = PTR_ERR(em->emrg_env);
 359                                 em->emrg_env = NULL;
 360                         }
 361                 } else
 362                         result = -ENOMEM;
 363         }
 364         if (result != 0) {
 365                 lov_emerg_free(emerg, nr);
 366                 emerg = ERR_PTR(result);
 367         }
 368         return emerg;
 369 }
 370
 371 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
 372 {
 373         int   result;
 374         __u32 tgt_size;
 375         __u32 sub_size;
 376
 377         ENTRY;
 378         result = 0;
 379         tgt_size = dev->ld_lov->lov_tgt_size;
 380         sub_size = dev->ld_target_nr;
 381         if (sub_size < tgt_size) {
 382                 struct lovsub_device    **newd;
 383                 struct lov_device_emerg **emerg;
 384                 const size_t              sz   = sizeof newd[0];
 385
 386                 emerg = lov_emerg_alloc(tgt_size);
 387                 if (IS_ERR(emerg))
 388                         RETURN(PTR_ERR(emerg));
 389
 390                 OBD_ALLOC(newd, tgt_size * sz);
 391                 if (newd != NULL) {
 392                         mutex_lock(&dev->ld_mutex);
 393                         if (sub_size > 0) {
 394                                 memcpy(newd, dev->ld_target, sub_size * sz);
 395                                 OBD_FREE(dev->ld_target, sub_size * sz);
 396                         }
 397                         dev->ld_target    = newd;
 398                         dev->ld_target_nr = tgt_size;
 399
 400                         if (dev->ld_emrg != NULL)
 401                                 lov_emerg_free(dev->ld_emrg, sub_size);
 402                         dev->ld_emrg = emerg;
 403                         mutex_unlock(&dev->ld_mutex);
 404                 } else {
 405                         lov_emerg_free(emerg, tgt_size);
 406                         result = -ENOMEM;
 407                 }
 408         }
 409         RETURN(result);
 410 }
 411
 412 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
 413                              __u32 index)
 414 {
 415         struct obd_device    *obd = dev->ld_obd;
 416         struct lov_device    *ld  = lu2lov_dev(dev);
 417         struct lov_tgt_desc  *tgt;
 418         struct lovsub_device *lsd;
 419         struct cl_device     *cl;
 420         int rc;
 421         ENTRY;
 422
 423         lov_getref(obd);
 424
 425         tgt = obd->u.lov.lov_tgts[index];
 426         LASSERT(tgt != NULL);
 427
 428         rc = lov_expand_targets(env, ld);
 429         if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
 430                 LASSERT(dev->ld_site != NULL);
 431                 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
 432                                    tgt->ltd_exp->exp_obd->obd_lu_dev);
 433                 if (!IS_ERR(cl)) {
 434                         lsd = cl2lovsub_dev(cl);
 435                         lsd->acid_idx = index;
 436                         lsd->acid_super = ld;
 437                         ld->ld_target[index] = lsd;
 438                 } else {
 439                         CERROR("add failed (%d), deleting %s\n", rc,
 440                                obd_uuid2str(&tgt->ltd_uuid));
 441                         lov_cl_del_target(env, dev, index);
 442                         rc = PTR_ERR(cl);
 443                 }
 444         }
 445         lov_putref(obd);
 446         RETURN(rc);
 447 }
 448
 449 static int lov_process_config(const struct lu_env *env,
 450                               struct lu_device *d, struct lustre_cfg *cfg)
 451 {
 452         struct obd_device *obd = d->ld_obd;
 453         int cmd;
 454         int rc;
 455         int gen;
 456         __u32 index;
 457
 458         lov_getref(obd);
 459
 460         cmd = cfg->lcfg_command;
 461         rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
 462         if (rc == 0) {
 463                 switch(cmd) {
 464                 case LCFG_LOV_ADD_OBD:
 465                 case LCFG_LOV_ADD_INA:
 466                         rc = lov_cl_add_target(env, d, index);
 467                         if (rc != 0)
 468                                 lov_del_target(d->ld_obd, index, 0, 0);
 469                         break;
 470                 case LCFG_LOV_DEL_OBD:
 471                         lov_cl_del_target(env, d, index);
 472                         break;
 473                 }
 474         }
 475         lov_putref(obd);
 476         RETURN(rc);
 477 }
 478
 479 static const struct lu_device_operations lov_lu_ops = {
 480         .ldo_object_alloc      = lov_object_alloc,
 481         .ldo_process_config    = lov_process_config,
 482 };
 483
 484 static struct lu_device *lov_device_alloc(const struct lu_env *env,
 485                                           struct lu_device_type *t,
 486                                           struct lustre_cfg *cfg)
 487 {
 488         struct lu_device *d;
 489         struct lov_device *ld;
 490         struct obd_device *obd;
 491         int rc;
 492
 493         OBD_ALLOC_PTR(ld);
 494         if (ld == NULL)
 495                 RETURN(ERR_PTR(-ENOMEM));
 496
 497         cl_device_init(&ld->ld_cl, t);
 498         d = lov2lu_dev(ld);
 499         d->ld_ops        = &lov_lu_ops;
 500         ld->ld_cl.cd_ops = &lov_cl_ops;
 501
 502         mutex_init(&ld->ld_mutex);
 503         lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
 504
 505         /* setup the LOV OBD */
 506         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 507         LASSERT(obd != NULL);
 508         rc = lov_setup(obd, cfg);
 509         if (rc) {
 510                 lov_device_free(env, d);
 511                 RETURN(ERR_PTR(rc));
 512         }
 513
 514         ld->ld_lov = &obd->u.lov;
 515         RETURN(d);
 516 }
 517
 518 static const struct lu_device_type_operations lov_device_type_ops = {
 519         .ldto_init = lov_type_init,
 520         .ldto_fini = lov_type_fini,
 521
 522         .ldto_start = lov_type_start,
 523         .ldto_stop  = lov_type_stop,
 524
 525         .ldto_device_alloc = lov_device_alloc,
 526         .ldto_device_free  = lov_device_free,
 527
 528         .ldto_device_init    = lov_device_init,
 529         .ldto_device_fini    = lov_device_fini
 530 };
 531
 532 struct lu_device_type lov_device_type = {
 533         .ldt_tags     = LU_DEVICE_CL,
 534         .ldt_name     = LUSTRE_LOV_NAME,
 535         .ldt_ops      = &lov_device_type_ops,
 536         .ldt_ctx_tags = LCT_CL_THREAD
 537 };
 538 EXPORT_SYMBOL(lov_device_type);
 539
 540 /** @} lov */