lustre/lov/lov_object.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 (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  *
  32  * Copyright (c) 2011, Whamcloud, Inc.
  33  */
  34 /*
  35  * This file is part of Lustre, http://www.lustre.org/
  36  * Lustre is a trademark of Sun Microsystems, Inc.
  37  *
  38  * Implementation of cl_object for LOV layer.
  39  *
  40  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_LOV
  44
  45 #include "lov_cl_internal.h"
  46
  47 /** \addtogroup lov
  48  *  @{
  49  */
  50
  51 /*****************************************************************************
  52  *
  53  * Layout operations.
  54  *
  55  */
  56
  57 struct lov_layout_operations {
  58         int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
  59                         struct lov_object *lov,
  60                         const struct cl_object_conf *conf,
  61                         union lov_layout_state *state);
  62         void (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
  63                            union lov_layout_state *state);
  64         void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
  65                          union lov_layout_state *state);
  66         void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
  67                             union lov_layout_state *state);
  68         int  (*llo_print)(const struct lu_env *env, void *cookie,
  69                           lu_printer_t p, const struct lu_object *o);
  70         struct cl_page *(*llo_page_init)(const struct lu_env *env,
  71                                          struct cl_object *obj,
  72                                          struct cl_page *page,
  73                                          cfs_page_t *vmpage);
  74         int  (*llo_lock_init)(const struct lu_env *env,
  75                               struct cl_object *obj, struct cl_lock *lock,
  76                               const struct cl_io *io);
  77         int  (*llo_io_init)(const struct lu_env *env,
  78                             struct cl_object *obj, struct cl_io *io);
  79         int  (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
  80                             struct cl_attr *attr);
  81 };
  82
  83 /*****************************************************************************
  84  *
  85  * Lov object layout operations.
  86  *
  87  */
  88
  89 static void lov_install_empty(const struct lu_env *env,
  90                               struct lov_object *lov,
  91                               union  lov_layout_state *state)
  92 {
  93         /*
  94          * File without objects.
  95          */
  96 }
  97
  98 static int lov_init_empty(const struct lu_env *env,
  99                           struct lov_device *dev, struct lov_object *lov,
 100                           const struct cl_object_conf *conf,
 101                           union  lov_layout_state *state)
 102 {
 103         return 0;
 104 }
 105
 106 static void lov_install_raid0(const struct lu_env *env,
 107                               struct lov_object *lov,
 108                               union  lov_layout_state *state)
 109 {
 110         lov->u = *state;
 111 }
 112
 113 static struct cl_object *lov_sub_find(const struct lu_env *env,
 114                                       struct cl_device *dev,
 115                                       const struct lu_fid *fid,
 116                                       const struct cl_object_conf *conf)
 117 {
 118         struct lu_object *o;
 119
 120         ENTRY;
 121         o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
 122         LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
 123         RETURN(lu2cl(o));
 124 }
 125
 126 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
 127                         struct cl_object *stripe,
 128                         struct lov_layout_raid0 *r0, int idx)
 129 {
 130         struct cl_object_header *hdr;
 131         struct cl_object_header *subhdr;
 132         struct cl_object_header *parent;
 133         struct lov_oinfo        *oinfo;
 134         int result;
 135
 136         hdr    = cl_object_header(lov2cl(lov));
 137         subhdr = cl_object_header(stripe);
 138         parent = subhdr->coh_parent;
 139
 140         oinfo = r0->lo_lsm->lsm_oinfo[idx];
 141         CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: id: "LPU64" seq: "LPU64
 142                " idx: %d gen: %d\n",
 143                PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
 144                PFID(&hdr->coh_lu.loh_fid), hdr,
 145                oinfo->loi_id, oinfo->loi_seq,
 146                oinfo->loi_ost_idx, oinfo->loi_ost_gen);
 147
 148         if (parent == NULL) {
 149                 subhdr->coh_parent = hdr;
 150                 subhdr->coh_nesting = hdr->coh_nesting + 1;
 151                 lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
 152                 r0->lo_sub[idx] = cl2lovsub(stripe);
 153                 r0->lo_sub[idx]->lso_super = lov;
 154                 r0->lo_sub[idx]->lso_index = idx;
 155                 result = 0;
 156         } else {
 157                 CERROR("Stripe is already owned by other file (%d).\n", idx);
 158                 LU_OBJECT_DEBUG(D_ERROR, env, &stripe->co_lu, "\n");
 159                 LU_OBJECT_DEBUG(D_ERROR, env, lu_object_top(&parent->coh_lu),
 160                                 "old\n");
 161                 LU_OBJECT_HEADER(D_ERROR, env, lov2lu(lov), "new\n");
 162                 cl_object_put(env, stripe);
 163                 result = -EIO;
 164         }
 165         return result;
 166 }
 167
 168 static int lov_init_raid0(const struct lu_env *env,
 169                           struct lov_device *dev, struct lov_object *lov,
 170                           const struct cl_object_conf *conf,
 171                           union  lov_layout_state *state)
 172 {
 173         int result;
 174         int i;
 175
 176         struct cl_object        *stripe;
 177         struct lov_thread_info  *lti     = lov_env_info(env);
 178         struct cl_object_conf   *subconf = &lti->lti_stripe_conf;
 179         struct lov_stripe_md    *lsm     = conf->u.coc_md->lsm;
 180         struct lu_fid           *ofid    = &lti->lti_fid;
 181         struct lov_layout_raid0 *r0      = &state->raid0;
 182
 183         ENTRY;
 184         r0->lo_nr  = conf->u.coc_md->lsm->lsm_stripe_count;
 185         r0->lo_lsm = conf->u.coc_md->lsm;
 186         LASSERT(r0->lo_nr <= lov_targets_nr(dev));
 187
 188         OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 189         if (r0->lo_sub != NULL) {
 190                 result = 0;
 191                 subconf->coc_inode = conf->coc_inode;
 192                 cfs_spin_lock_init(&r0->lo_sub_lock);
 193                 /*
 194                  * Create stripe cl_objects.
 195                  */
 196                 for (i = 0; i < r0->lo_nr && result == 0; ++i) {
 197                         struct cl_device *subdev;
 198                         struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
 199                         int ost_idx = oinfo->loi_ost_idx;
 200
 201                         fid_ostid_unpack(ofid, &oinfo->loi_oi,
 202                                          oinfo->loi_ost_idx);
 203                         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 204                         subconf->u.coc_oinfo = oinfo;
 205                         LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 206                         stripe = lov_sub_find(env, subdev, ofid, subconf);
 207                         if (!IS_ERR(stripe))
 208                                 result = lov_init_sub(env, lov, stripe, r0, i);
 209                         else
 210                                 result = PTR_ERR(stripe);
 211                 }
 212         } else
 213                 result = -ENOMEM;
 214         RETURN(result);
 215 }
 216
 217 static void lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 218                              union lov_layout_state *state)
 219 {
 220         LASSERT(lov->lo_type == LLT_EMPTY);
 221 }
 222
 223 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 224                                struct lovsub_object *los, int idx)
 225 {
 226         struct cl_object        *sub;
 227         struct lov_layout_raid0 *r0;
 228         struct lu_site          *site;
 229         struct lu_site_bkt_data *bkt;
 230         cfs_waitlink_t          *waiter;
 231
 232         r0  = &lov->u.raid0;
 233         LASSERT(r0->lo_sub[idx] == los);
 234
 235         sub  = lovsub2cl(los);
 236         site = sub->co_lu.lo_dev->ld_site;
 237         bkt  = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
 238
 239         cl_object_kill(env, sub);
 240         /* release a reference to the sub-object and ... */
 241         lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
 242         cl_object_put(env, sub);
 243
 244         /* ... wait until it is actually destroyed---sub-object clears its
 245          * ->lo_sub[] slot in lovsub_object_fini() */
 246         if (r0->lo_sub[idx] == los) {
 247                 waiter = &lov_env_info(env)->lti_waiter;
 248                 cfs_waitlink_init(waiter);
 249                 cfs_waitq_add(&bkt->lsb_marche_funebre, waiter);
 250                 cfs_set_current_state(CFS_TASK_UNINT);
 251                 while (1) {
 252                         /* this wait-queue is signaled at the end of
 253                          * lu_object_free(). */
 254                         cfs_set_current_state(CFS_TASK_UNINT);
 255                         cfs_spin_lock(&r0->lo_sub_lock);
 256                         if (r0->lo_sub[idx] == los) {
 257                                 cfs_spin_unlock(&r0->lo_sub_lock);
 258                                 cfs_waitq_wait(waiter, CFS_TASK_UNINT);
 259                         } else {
 260                                 cfs_spin_unlock(&r0->lo_sub_lock);
 261                                 cfs_set_current_state(CFS_TASK_RUNNING);
 262                                 break;
 263                         }
 264                 }
 265                 cfs_waitq_del(&bkt->lsb_marche_funebre, waiter);
 266         }
 267         LASSERT(r0->lo_sub[idx] == NULL);
 268 }
 269
 270 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 271                              union lov_layout_state *state)
 272 {
 273         struct lov_layout_raid0 *r0 = &state->raid0;
 274         int                      i;
 275
 276         ENTRY;
 277         if (r0->lo_sub != NULL) {
 278                 for (i = 0; i < r0->lo_nr; ++i) {
 279                         struct lovsub_object *los = r0->lo_sub[i];
 280
 281                         if (los != NULL)
 282                                 /*
 283                                  * If top-level object is to be evicted from
 284                                  * the cache, so are its sub-objects.
 285                                  */
 286                                 lov_subobject_kill(env, lov, los, i);
 287                 }
 288         }
 289         EXIT;
 290 }
 291
 292 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 293                            union lov_layout_state *state)
 294 {
 295         LASSERT(lov->lo_type == LLT_EMPTY);
 296 }
 297
 298 static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
 299                            union lov_layout_state *state)
 300 {
 301         struct lov_layout_raid0 *r0 = &state->raid0;
 302
 303         ENTRY;
 304         if (r0->lo_sub != NULL) {
 305                 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 306                 r0->lo_sub = NULL;
 307         }
 308         EXIT;
 309 }
 310
 311 static int lov_print_empty(const struct lu_env *env, void *cookie,
 312                            lu_printer_t p, const struct lu_object *o)
 313 {
 314         (*p)(env, cookie, "empty\n");
 315         return 0;
 316 }
 317
 318 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 319                            lu_printer_t p, const struct lu_object *o)
 320 {
 321         struct lov_object       *lov = lu2lov(o);
 322         struct lov_layout_raid0 *r0  = lov_r0(lov);
 323         int i;
 324
 325         (*p)(env, cookie, "stripes: %d:\n", r0->lo_nr);
 326         for (i = 0; i < r0->lo_nr; ++i) {
 327                 struct lu_object *sub;
 328
 329                 if (r0->lo_sub[i] != NULL) {
 330                         sub = lovsub2lu(r0->lo_sub[i]);
 331                         lu_object_print(env, cookie, p, sub);
 332                 } else
 333                         (*p)(env, cookie, "sub %d absent\n", i);
 334         }
 335         return 0;
 336 }
 337
 338 /**
 339  * Implements cl_object_operations::coo_attr_get() method for an object
 340  * without stripes (LLT_EMPTY layout type).
 341  *
 342  * The only attributes this layer is authoritative in this case is
 343  * cl_attr::cat_blocks---it's 0.
 344  */
 345 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 346                               struct cl_attr *attr)
 347 {
 348         attr->cat_blocks = 0;
 349         return 0;
 350 }
 351
 352 static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
 353                               struct cl_attr *attr)
 354 {
 355         struct lov_object       *lov = cl2lov(obj);
 356         struct lov_layout_raid0 *r0 = lov_r0(lov);
 357         struct lov_stripe_md    *lsm = lov->u.raid0.lo_lsm;
 358         struct ost_lvb          *lvb = &lov_env_info(env)->lti_lvb;
 359         __u64                    kms;
 360         int                      result = 0;
 361
 362         ENTRY;
 363         if (!r0->lo_attr_valid) {
 364                 /*
 365                  * Fill LVB with attributes already initialized by the upper
 366                  * layer.
 367                  */
 368                 cl_attr2lvb(lvb, attr);
 369                 kms = attr->cat_kms;
 370
 371                 /*
 372                  * XXX that should be replaced with a loop over sub-objects,
 373                  * doing cl_object_attr_get() on them. But for now, let's
 374                  * reuse old lov code.
 375                  */
 376
 377                 /*
 378                  * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 379                  * happy. It's not needed, because new code uses
 380                  * ->coh_attr_guard spin-lock to protect consistency of
 381                  * sub-object attributes.
 382                  */
 383                 lov_stripe_lock(lsm);
 384                 result = lov_merge_lvb_kms(lsm, lvb, &kms);
 385                 lov_stripe_unlock(lsm);
 386                 if (result == 0) {
 387                         cl_lvb2attr(attr, lvb);
 388                         attr->cat_kms = kms;
 389                         r0->lo_attr_valid = 1;
 390                         r0->lo_attr = *attr;
 391                 }
 392         } else
 393                 *attr = r0->lo_attr;
 394         RETURN(result);
 395 }
 396
 397 const static struct lov_layout_operations lov_dispatch[] = {
 398         [LLT_EMPTY] = {
 399                 .llo_init      = lov_init_empty,
 400                 .llo_delete    = lov_delete_empty,
 401                 .llo_fini      = lov_fini_empty,
 402                 .llo_install   = lov_install_empty,
 403                 .llo_print     = lov_print_empty,
 404                 .llo_page_init = lov_page_init_empty,
 405                 .llo_lock_init = NULL,
 406                 .llo_io_init   = lov_io_init_empty,
 407                 .llo_getattr   = lov_attr_get_empty
 408         },
 409         [LLT_RAID0] = {
 410                 .llo_init      = lov_init_raid0,
 411                 .llo_delete    = lov_delete_raid0,
 412                 .llo_fini      = lov_fini_raid0,
 413                 .llo_install   = lov_install_raid0,
 414                 .llo_print     = lov_print_raid0,
 415                 .llo_page_init = lov_page_init_raid0,
 416                 .llo_lock_init = lov_lock_init_raid0,
 417                 .llo_io_init   = lov_io_init_raid0,
 418                 .llo_getattr   = lov_attr_get_raid0
 419         }
 420 };
 421
 422
 423 /**
 424  * Performs a double-dispatch based on the layout type of an object.
 425  */
 426 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)                              \
 427 ({                                                                      \
 428         struct lov_object                      *__obj = (obj);          \
 429         enum lov_layout_type                    __llt;                  \
 430                                                                         \
 431         __llt = __obj->lo_type;                                         \
 432         LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch));        \
 433         lov_dispatch[__llt].op(__VA_ARGS__);                            \
 434 })
 435
 436 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
 437 ({                                                                      \
 438         struct lov_object                      *__obj = (obj);          \
 439         int                                     __lock = !!(lock);      \
 440         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
 441                                                                         \
 442         __lock &= __obj->lo_owner != cfs_current();                     \
 443         if (__lock)                                                     \
 444                 cfs_down_read(&__obj->lo_type_guard);                   \
 445         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
 446         if (__lock)                                                     \
 447                 cfs_up_read(&__obj->lo_type_guard);                     \
 448         __result;                                                       \
 449 })
 450
 451 /**
 452  * Performs a locked double-dispatch based on the layout type of an object.
 453  */
 454 #define LOV_2DISPATCH(obj, op, ...)                     \
 455         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
 456
 457 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
 458 do {                                                                    \
 459         struct lov_object                      *__obj = (obj);          \
 460         enum lov_layout_type                    __llt;                  \
 461                                                                         \
 462         if (__obj->lo_owner != cfs_current())                           \
 463                 cfs_down_read(&__obj->lo_type_guard);                   \
 464         __llt = __obj->lo_type;                                         \
 465         LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch));        \
 466         lov_dispatch[__llt].op(__VA_ARGS__);                            \
 467         if (__obj->lo_owner != cfs_current())                           \
 468                 cfs_up_read(&__obj->lo_type_guard);                     \
 469 } while (0)
 470
 471 static int lov_layout_change(const struct lu_env *env,
 472                              struct lov_object *obj, enum lov_layout_type llt,
 473                              const struct cl_object_conf *conf)
 474 {
 475         int result;
 476         union lov_layout_state       *state = &lov_env_info(env)->lti_state;
 477         const struct lov_layout_operations *old_ops;
 478         const struct lov_layout_operations *new_ops;
 479
 480         LASSERT(0 <= obj->lo_type && obj->lo_type < ARRAY_SIZE(lov_dispatch));
 481         LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
 482         ENTRY;
 483
 484         old_ops = &lov_dispatch[obj->lo_type];
 485         new_ops = &lov_dispatch[llt];
 486
 487         result = new_ops->llo_init(env, lu2lov_dev(obj->lo_cl.co_lu.lo_dev),
 488                                    obj, conf, state);
 489         if (result == 0) {
 490                 struct cl_object_header *hdr = cl_object_header(&obj->lo_cl);
 491                 void                    *cookie;
 492                 struct lu_env           *nested;
 493                 int                      refcheck;
 494
 495                 cookie = cl_env_reenter();
 496                 nested = cl_env_get(&refcheck);
 497                 if (!IS_ERR(nested))
 498                         cl_object_prune(nested, &obj->lo_cl);
 499                 else
 500                         result = PTR_ERR(nested);
 501                 cl_env_put(nested, &refcheck);
 502                 cl_env_reexit(cookie);
 503
 504                 old_ops->llo_fini(env, obj, &obj->u);
 505                 LASSERT(cfs_list_empty(&hdr->coh_locks));
 506                 LASSERT(hdr->coh_tree.rnode == NULL);
 507                 LASSERT(hdr->coh_pages == 0);
 508
 509                 new_ops->llo_install(env, obj, state);
 510                 obj->lo_type = llt;
 511         } else
 512                 new_ops->llo_fini(env, obj, state);
 513         RETURN(result);
 514 }
 515
 516 /*****************************************************************************
 517  *
 518  * Lov object operations.
 519  *
 520  */
 521
 522 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
 523                     const struct lu_object_conf *conf)
 524 {
 525         struct lov_device            *dev   = lu2lov_dev(obj->lo_dev);
 526         struct lov_object            *lov   = lu2lov(obj);
 527         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
 528         union  lov_layout_state      *set   = &lov_env_info(env)->lti_state;
 529         const struct lov_layout_operations *ops;
 530         int result;
 531
 532         ENTRY;
 533         cfs_init_rwsem(&lov->lo_type_guard);
 534
 535         /* no locking is necessary, as object is being created */
 536         lov->lo_type = cconf->u.coc_md->lsm != NULL ? LLT_RAID0 : LLT_EMPTY;
 537         ops = &lov_dispatch[lov->lo_type];
 538         result = ops->llo_init(env, dev, lov, cconf, set);
 539         if (result == 0)
 540                 ops->llo_install(env, lov, set);
 541         else
 542                 ops->llo_fini(env, lov, set);
 543         RETURN(result);
 544 }
 545
 546 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
 547                         const struct cl_object_conf *conf)
 548 {
 549         struct lov_object *lov = cl2lov(obj);
 550         int result;
 551
 552         ENTRY;
 553         /*
 554          * Currently only LLT_EMPTY -> LLT_RAID0 transition is supported.
 555          */
 556         LASSERT(lov->lo_owner != cfs_current());
 557         cfs_down_write(&lov->lo_type_guard);
 558         LASSERT(lov->lo_owner == NULL);
 559         lov->lo_owner = cfs_current();
 560         if (lov->lo_type == LLT_EMPTY && conf->u.coc_md->lsm != NULL)
 561                 result = lov_layout_change(env, lov, LLT_RAID0, conf);
 562         else
 563                 result = -EOPNOTSUPP;
 564         lov->lo_owner = NULL;
 565         cfs_up_write(&lov->lo_type_guard);
 566         RETURN(result);
 567 }
 568
 569 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
 570 {
 571         struct lov_object *lov = lu2lov(obj);
 572
 573         ENTRY;
 574         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
 575         EXIT;
 576 }
 577
 578 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
 579 {
 580         struct lov_object *lov = lu2lov(obj);
 581
 582         ENTRY;
 583         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
 584         lu_object_fini(obj);
 585         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
 586         EXIT;
 587 }
 588
 589 static int lov_object_print(const struct lu_env *env, void *cookie,
 590                             lu_printer_t p, const struct lu_object *o)
 591 {
 592         return LOV_2DISPATCH(lu2lov(o), llo_print, env, cookie, p, o);
 593 }
 594
 595 struct cl_page *lov_page_init(const struct lu_env *env, struct cl_object *obj,
 596                               struct cl_page *page, cfs_page_t *vmpage)
 597 {
 598         return LOV_2DISPATCH(cl2lov(obj),
 599                              llo_page_init, env, obj, page, vmpage);
 600 }
 601
 602 /**
 603  * Implements cl_object_operations::clo_io_init() method for lov
 604  * layer. Dispatches to the appropriate layout io initialization method.
 605  */
 606 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
 607                 struct cl_io *io)
 608 {
 609         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
 610         /*
 611          * Do not take lock in case of CIT_MISC io, because
 612          *
 613          *     - if this is an io for a glimpse, then we don't care;
 614          *
 615          *     - if this not a glimpse (writepage or lock cancellation), then
 616          *       layout change cannot happen because a page or a lock
 617          *       already exist; and
 618          *
 619          *     - lock ordering (lock mutex nests within layout rw-semaphore)
 620          *       is obeyed in case of lock cancellation.
 621          */
 622         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
 623                                      io->ci_type != CIT_MISC, env, obj, io);
 624 }
 625
 626 /**
 627  * An implementation of cl_object_operations::clo_attr_get() method for lov
 628  * layer. For raid0 layout this collects and merges attributes of all
 629  * sub-objects.
 630  */
 631 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
 632                         struct cl_attr *attr)
 633 {
 634         /* do not take lock, as this function is called under a
 635          * spin-lock. Layout is protected from changing by ongoing IO. */
 636         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
 637 }
 638
 639 static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
 640                         const struct cl_attr *attr, unsigned valid)
 641 {
 642         /*
 643          * No dispatch is required here, as no layout implements this.
 644          */
 645         return 0;
 646 }
 647
 648 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
 649                   struct cl_lock *lock, const struct cl_io *io)
 650 {
 651         return LOV_2DISPATCH(cl2lov(obj), llo_lock_init, env, obj, lock, io);
 652 }
 653
 654 static const struct cl_object_operations lov_ops = {
 655         .coo_page_init = lov_page_init,
 656         .coo_lock_init = lov_lock_init,
 657         .coo_io_init   = lov_io_init,
 658         .coo_attr_get  = lov_attr_get,
 659         .coo_attr_set  = lov_attr_set,
 660         .coo_conf_set  = lov_conf_set
 661 };
 662
 663 static const struct lu_object_operations lov_lu_obj_ops = {
 664         .loo_object_init      = lov_object_init,
 665         .loo_object_delete    = lov_object_delete,
 666         .loo_object_release   = NULL,
 667         .loo_object_free      = lov_object_free,
 668         .loo_object_print     = lov_object_print,
 669         .loo_object_invariant = NULL
 670 };
 671
 672 struct lu_object *lov_object_alloc(const struct lu_env *env,
 673                                    const struct lu_object_header *unused,
 674                                    struct lu_device *dev)
 675 {
 676         struct lov_object *lov;
 677         struct lu_object  *obj;
 678
 679         ENTRY;
 680         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, CFS_ALLOC_IO);
 681         if (lov != NULL) {
 682                 obj = lov2lu(lov);
 683                 lu_object_init(obj, NULL, dev);
 684                 lov->lo_cl.co_ops = &lov_ops;
 685                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
 686                 /*
 687                  * object io operation vector (cl_object::co_iop) is installed
 688                  * later in lov_object_init(), as different vectors are used
 689                  * for object with different layouts.
 690                  */
 691                 obj->lo_ops = &lov_lu_obj_ops;
 692         } else
 693                 obj = NULL;
 694         RETURN(obj);
 695 }
 696
 697 /** @} lov */