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                 CFS_INIT_LIST_HEAD(&info->lti_closure.clc_list);
 149         else
 150                 info = ERR_PTR(-ENOMEM);
 151         return info;
 152 }
 153
 154 static void lov_key_fini(const struct lu_context *ctx,
 155                          struct lu_context_key *key, void *data)
 156 {
 157         struct lov_thread_info *info = data;
 158         LINVRNT(cfs_list_empty(&info->lti_closure.clc_list));
 159         OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
 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         OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
 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         OBD_SLAB_FREE_PTR(info, lov_session_kmem);
 184 }
 185
 186 struct lu_context_key lov_session_key = {
 187         .lct_tags = LCT_SESSION,
 188         .lct_init = lov_session_key_init,
 189         .lct_fini = lov_session_key_fini
 190 };
 191
 192 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
 193 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
 194
 195 static struct lu_device *lov_device_fini(const struct lu_env *env,
 196                                          struct lu_device *d)
 197 {
 198         int i;
 199         struct lov_device *ld = lu2lov_dev(d);
 200
 201         LASSERT(ld->ld_lov != NULL);
 202         if (ld->ld_target == NULL)
 203                 RETURN(NULL);
 204
 205         lov_foreach_target(ld, i) {
 206                 struct lovsub_device *lsd;
 207
 208                 lsd = ld->ld_target[i];
 209                 if (lsd != NULL) {
 210                         cl_stack_fini(env, lovsub2cl_dev(lsd));
 211                         ld->ld_target[i] = NULL;
 212                 }
 213         }
 214         RETURN(NULL);
 215 }
 216
 217 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
 218                            const char *name, struct lu_device *next)
 219 {
 220         struct lov_device *ld = lu2lov_dev(d);
 221         int i;
 222         int rc = 0;
 223
 224         LASSERT(d->ld_site != NULL);
 225         if (ld->ld_target == NULL)
 226                 RETURN(rc);
 227
 228         lov_foreach_target(ld, i) {
 229                 struct lovsub_device *lsd;
 230                 struct cl_device     *cl;
 231                 struct lov_tgt_desc  *desc;
 232
 233                 desc = ld->ld_lov->lov_tgts[i];
 234                 if (desc == NULL)
 235                         continue;
 236
 237                 cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
 238                                    desc->ltd_obd->obd_lu_dev);
 239                 if (IS_ERR(cl)) {
 240                         rc = PTR_ERR(cl);
 241                         break;
 242                 }
 243                 lsd = cl2lovsub_dev(cl);
 244                 lsd->acid_idx = i;
 245                 lsd->acid_super = ld;
 246                 ld->ld_target[i] = lsd;
 247         }
 248
 249         if (rc)
 250                 lov_device_fini(env, d);
 251         else
 252                 ld->ld_flags |= LOV_DEV_INITIALIZED;
 253
 254         RETURN(rc);
 255 }
 256
 257 static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
 258                         struct cl_req *req)
 259 {
 260         struct lov_req *lr;
 261         int result;
 262
 263         ENTRY;
 264         OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, GFP_NOFS);
 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                         OBD_FREE_PTR(em);
 290                 }
 291         }
 292         OBD_FREE(emrg, nr * sizeof emrg[0]);
 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         if (ld->ld_target != NULL)
 303                 OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
 304         if (ld->ld_emrg != NULL)
 305                 lov_emerg_free(ld->ld_emrg, nr);
 306         OBD_FREE_PTR(ld);
 307         return NULL;
 308 }
 309
 310 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
 311                               __u32 index)
 312 {
 313         struct lov_device *ld = lu2lov_dev(dev);
 314         ENTRY;
 315
 316         if (ld->ld_target[index] != NULL) {
 317                 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
 318                 ld->ld_target[index] = NULL;
 319         }
 320         EXIT;
 321 }
 322
 323 static struct lov_device_emerg **lov_emerg_alloc(int nr)
 324 {
 325         struct lov_device_emerg **emerg;
 326         int i;
 327         int result;
 328
 329         OBD_ALLOC(emerg, nr * sizeof emerg[0]);
 330         if (emerg == NULL)
 331                 return ERR_PTR(-ENOMEM);
 332         for (result = i = 0; i < nr && result == 0; i++) {
 333                 struct lov_device_emerg *em;
 334
 335                 OBD_ALLOC_PTR(em);
 336                 if (em != NULL) {
 337                         emerg[i] = em;
 338                         cl_page_list_init(&em->emrg_page_list);
 339                         em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
 340                                                     LCT_REMEMBER|LCT_NOREF);
 341                         if (!IS_ERR(em->emrg_env))
 342                                 em->emrg_env->le_ctx.lc_cookie = 0x2;
 343                         else {
 344                                 result = PTR_ERR(em->emrg_env);
 345                                 em->emrg_env = NULL;
 346                         }
 347                 } else
 348                         result = -ENOMEM;
 349         }
 350         if (result != 0) {
 351                 lov_emerg_free(emerg, nr);
 352                 emerg = ERR_PTR(result);
 353         }
 354         return emerg;
 355 }
 356
 357 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
 358 {
 359         int   result;
 360         __u32 tgt_size;
 361         __u32 sub_size;
 362
 363         ENTRY;
 364         result = 0;
 365         tgt_size = dev->ld_lov->lov_tgt_size;
 366         sub_size = dev->ld_target_nr;
 367         if (sub_size < tgt_size) {
 368                 struct lovsub_device    **newd;
 369                 struct lov_device_emerg **emerg;
 370                 const size_t              sz   = sizeof newd[0];
 371
 372                 emerg = lov_emerg_alloc(tgt_size);
 373                 if (IS_ERR(emerg))
 374                         RETURN(PTR_ERR(emerg));
 375
 376                 OBD_ALLOC(newd, tgt_size * sz);
 377                 if (newd != NULL) {
 378                         mutex_lock(&dev->ld_mutex);
 379                         if (sub_size > 0) {
 380                                 memcpy(newd, dev->ld_target, sub_size * sz);
 381                                 OBD_FREE(dev->ld_target, sub_size * sz);
 382                         }
 383                         dev->ld_target    = newd;
 384                         dev->ld_target_nr = tgt_size;
 385
 386                         if (dev->ld_emrg != NULL)
 387                                 lov_emerg_free(dev->ld_emrg, sub_size);
 388                         dev->ld_emrg = emerg;
 389                         mutex_unlock(&dev->ld_mutex);
 390                 } else {
 391                         lov_emerg_free(emerg, tgt_size);
 392                         result = -ENOMEM;
 393                 }
 394         }
 395         RETURN(result);
 396 }
 397
 398 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
 399                              __u32 index)
 400 {
 401         struct obd_device    *obd = dev->ld_obd;
 402         struct lov_device    *ld  = lu2lov_dev(dev);
 403         struct lov_tgt_desc  *tgt;
 404         struct lovsub_device *lsd;
 405         struct cl_device     *cl;
 406         int rc;
 407         ENTRY;
 408
 409         obd_getref(obd);
 410
 411         tgt = obd->u.lov.lov_tgts[index];
 412         LASSERT(tgt != NULL);
 413         LASSERT(tgt->ltd_obd != NULL);
 414
 415         if (!tgt->ltd_obd->obd_set_up) {
 416                 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
 417                 RETURN(-EINVAL);
 418         }
 419
 420         rc = lov_expand_targets(env, ld);
 421         if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
 422                 LASSERT(dev->ld_site != NULL);
 423
 424                 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
 425                                    tgt->ltd_obd->obd_lu_dev);
 426                 if (!IS_ERR(cl)) {
 427                         lsd = cl2lovsub_dev(cl);
 428                         lsd->acid_idx = index;
 429                         lsd->acid_super = ld;
 430                         ld->ld_target[index] = lsd;
 431                 } else {
 432                         CERROR("add failed (%d), deleting %s\n", rc,
 433                                obd_uuid2str(&tgt->ltd_uuid));
 434                         lov_cl_del_target(env, dev, index);
 435                         rc = PTR_ERR(cl);
 436                 }
 437         }
 438         obd_putref(obd);
 439         RETURN(rc);
 440 }
 441
 442 static int lov_process_config(const struct lu_env *env,
 443                               struct lu_device *d, struct lustre_cfg *cfg)
 444 {
 445         struct obd_device *obd = d->ld_obd;
 446         int cmd;
 447         int rc;
 448         int gen;
 449         __u32 index;
 450
 451         obd_getref(obd);
 452
 453         cmd = cfg->lcfg_command;
 454         rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
 455         if (rc == 0) {
 456                 switch(cmd) {
 457                 case LCFG_LOV_ADD_OBD:
 458                 case LCFG_LOV_ADD_INA:
 459                         rc = lov_cl_add_target(env, d, index);
 460                         if (rc != 0)
 461                                 lov_del_target(d->ld_obd, index, 0, 0);
 462                         break;
 463                 case LCFG_LOV_DEL_OBD:
 464                         lov_cl_del_target(env, d, index);
 465                         break;
 466                 }
 467         }
 468         obd_putref(obd);
 469         RETURN(rc);
 470 }
 471
 472 static const struct lu_device_operations lov_lu_ops = {
 473         .ldo_object_alloc      = lov_object_alloc,
 474         .ldo_process_config    = lov_process_config,
 475 };
 476
 477 static struct lu_device *lov_device_alloc(const struct lu_env *env,
 478                                           struct lu_device_type *t,
 479                                           struct lustre_cfg *cfg)
 480 {
 481         struct lu_device *d;
 482         struct lov_device *ld;
 483         struct obd_device *obd;
 484         int rc;
 485
 486         OBD_ALLOC_PTR(ld);
 487         if (ld == NULL)
 488                 RETURN(ERR_PTR(-ENOMEM));
 489
 490         cl_device_init(&ld->ld_cl, t);
 491         d = lov2lu_dev(ld);
 492         d->ld_ops        = &lov_lu_ops;
 493         ld->ld_cl.cd_ops = &lov_cl_ops;
 494
 495         mutex_init(&ld->ld_mutex);
 496         lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
 497
 498         /* setup the LOV OBD */
 499         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 500         LASSERT(obd != NULL);
 501         rc = lov_setup(obd, cfg);
 502         if (rc) {
 503                 lov_device_free(env, d);
 504                 RETURN(ERR_PTR(rc));
 505         }
 506
 507         ld->ld_lov = &obd->u.lov;
 508         RETURN(d);
 509 }
 510
 511 static const struct lu_device_type_operations lov_device_type_ops = {
 512         .ldto_init = lov_type_init,
 513         .ldto_fini = lov_type_fini,
 514
 515         .ldto_start = lov_type_start,
 516         .ldto_stop  = lov_type_stop,
 517
 518         .ldto_device_alloc = lov_device_alloc,
 519         .ldto_device_free  = lov_device_free,
 520
 521         .ldto_device_init    = lov_device_init,
 522         .ldto_device_fini    = lov_device_fini
 523 };
 524
 525 struct lu_device_type lov_device_type = {
 526         .ldt_tags     = LU_DEVICE_CL,
 527         .ldt_name     = LUSTRE_LOV_NAME,
 528         .ldt_ops      = &lov_device_type_ops,
 529         .ldt_ctx_tags = LCT_CL_THREAD
 530 };
 531 EXPORT_SYMBOL(lov_device_type);
 532
 533 /** @} lov */