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