lustre/lov/lov_object.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) 2011, 2015, 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_object for LOV layer.
  37  *
  38  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  39  *   Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_LOV
  43
  44 #include "lov_cl_internal.h"
  45
  46 static inline struct lov_device *lov_object_dev(struct lov_object *obj)
  47 {
  48         return lu2lov_dev(obj->lo_cl.co_lu.lo_dev);
  49 }
  50
  51 /** \addtogroup lov
  52  *  @{
  53  */
  54
  55 /*****************************************************************************
  56  *
  57  * Layout operations.
  58  *
  59  */
  60
  61 struct lov_layout_operations {
  62         int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
  63                         struct lov_object *lov, struct lov_stripe_md *lsm,
  64                         const struct cl_object_conf *conf,
  65                         union lov_layout_state *state);
  66         int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
  67                            union lov_layout_state *state);
  68         void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
  69                          union lov_layout_state *state);
  70         void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
  71                             union lov_layout_state *state);
  72         int  (*llo_print)(const struct lu_env *env, void *cookie,
  73                           lu_printer_t p, const struct lu_object *o);
  74         int  (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
  75                               struct cl_page *page, pgoff_t index);
  76         int  (*llo_lock_init)(const struct lu_env *env,
  77                               struct cl_object *obj, struct cl_lock *lock,
  78                               const struct cl_io *io);
  79         int  (*llo_io_init)(const struct lu_env *env,
  80                             struct cl_object *obj, struct cl_io *io);
  81         int  (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
  82                             struct cl_attr *attr);
  83         int  (*llo_find_cbdata)(const struct lu_env *env, struct cl_object *obj,
  84                                 ldlm_iterator_t iter, void *data);
  85 };
  86
  87 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
  88
  89 static void lov_lsm_put(struct lov_stripe_md *lsm)
  90 {
  91         if (lsm != NULL)
  92                 lov_free_memmd(&lsm);
  93 }
  94
  95 /*****************************************************************************
  96  *
  97  * Lov object layout operations.
  98  *
  99  */
 100
 101 static void lov_install_empty(const struct lu_env *env,
 102                               struct lov_object *lov,
 103                               union  lov_layout_state *state)
 104 {
 105         /*
 106          * File without objects.
 107          */
 108 }
 109
 110 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
 111                           struct lov_object *lov, struct lov_stripe_md *lsm,
 112                           const struct cl_object_conf *conf,
 113                           union lov_layout_state *state)
 114 {
 115         return 0;
 116 }
 117
 118 static void lov_install_raid0(const struct lu_env *env,
 119                               struct lov_object *lov,
 120                               union  lov_layout_state *state)
 121 {
 122 }
 123
 124 static struct cl_object *lov_sub_find(const struct lu_env *env,
 125                                       struct cl_device *dev,
 126                                       const struct lu_fid *fid,
 127                                       const struct cl_object_conf *conf)
 128 {
 129         struct lu_object *o;
 130
 131         ENTRY;
 132         o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
 133         LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
 134         RETURN(lu2cl(o));
 135 }
 136
 137 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
 138                         struct cl_object *stripe, struct lov_layout_raid0 *r0,
 139                         int idx)
 140 {
 141         struct cl_object_header *hdr;
 142         struct cl_object_header *subhdr;
 143         struct cl_object_header *parent;
 144         struct lov_oinfo        *oinfo;
 145         int result;
 146
 147         if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
 148                 /* For sanity:test_206.
 149                  * Do not leave the object in cache to avoid accessing
 150                  * freed memory. This is because osc_object is referring to
 151                  * lov_oinfo of lsm_stripe_data which will be freed due to
 152                  * this failure. */
 153                 cl_object_kill(env, stripe);
 154                 cl_object_put(env, stripe);
 155                 return -EIO;
 156         }
 157
 158         hdr    = cl_object_header(lov2cl(lov));
 159         subhdr = cl_object_header(stripe);
 160
 161         oinfo = lov->lo_lsm->lsm_oinfo[idx];
 162         CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
 163                " idx: %d gen: %d\n",
 164                PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
 165                PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
 166                oinfo->loi_ost_idx, oinfo->loi_ost_gen);
 167
 168         /* reuse ->coh_attr_guard to protect coh_parent change */
 169         spin_lock(&subhdr->coh_attr_guard);
 170         parent = subhdr->coh_parent;
 171         if (parent == NULL) {
 172                 subhdr->coh_parent = hdr;
 173                 spin_unlock(&subhdr->coh_attr_guard);
 174                 subhdr->coh_nesting = hdr->coh_nesting + 1;
 175                 lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
 176                 r0->lo_sub[idx] = cl2lovsub(stripe);
 177                 r0->lo_sub[idx]->lso_super = lov;
 178                 r0->lo_sub[idx]->lso_index = idx;
 179                 result = 0;
 180         } else {
 181                 struct lu_object  *old_obj;
 182                 struct lov_object *old_lov;
 183                 unsigned int mask = D_INODE;
 184
 185                 spin_unlock(&subhdr->coh_attr_guard);
 186                 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
 187                 LASSERT(old_obj != NULL);
 188                 old_lov = cl2lov(lu2cl(old_obj));
 189                 if (old_lov->lo_layout_invalid) {
 190                         /* the object's layout has already changed but isn't
 191                          * refreshed */
 192                         lu_object_unhash(env, &stripe->co_lu);
 193                         result = -EAGAIN;
 194                 } else {
 195                         mask = D_ERROR;
 196                         result = -EIO;
 197                 }
 198
 199                 LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
 200                                 "stripe %d is already owned.\n", idx);
 201                 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
 202                 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
 203                 cl_object_put(env, stripe);
 204         }
 205         return result;
 206 }
 207
 208 static int lov_page_slice_fixup(struct lov_object *lov,
 209                                 struct cl_object *stripe)
 210 {
 211         struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
 212         struct cl_object *o;
 213
 214         if (stripe == NULL)
 215                 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
 216                        cfs_size_round(sizeof(struct lov_page));
 217
 218         cl_object_for_each(o, stripe)
 219                 o->co_slice_off += hdr->coh_page_bufsize;
 220
 221         return cl_object_header(stripe)->coh_page_bufsize;
 222 }
 223
 224 static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
 225                           struct lov_object *lov, struct lov_stripe_md *lsm,
 226                           const struct cl_object_conf *conf,
 227                           union lov_layout_state *state)
 228 {
 229         int result;
 230         int i;
 231
 232         struct cl_object        *stripe;
 233         struct lov_thread_info  *lti     = lov_env_info(env);
 234         struct cl_object_conf   *subconf = &lti->lti_stripe_conf;
 235         struct lu_fid           *ofid    = &lti->lti_fid;
 236         struct lov_layout_raid0 *r0      = &state->raid0;
 237
 238         ENTRY;
 239
 240         if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
 241                 dump_lsm(D_ERROR, lsm);
 242                 LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
 243                          LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
 244         }
 245
 246         LASSERT(lov->lo_lsm == NULL);
 247         lov->lo_lsm = lsm_addref(lsm);
 248         r0->lo_nr = lsm->lsm_stripe_count;
 249         LASSERT(r0->lo_nr <= lov_targets_nr(dev));
 250
 251         lov->lo_layout_invalid = true;
 252
 253         OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 254         if (r0->lo_sub != NULL) {
 255                 int psz = 0;
 256
 257                 result = 0;
 258                 subconf->coc_inode = conf->coc_inode;
 259                 spin_lock_init(&r0->lo_sub_lock);
 260                 /*
 261                  * Create stripe cl_objects.
 262                  */
 263                 for (i = 0; i < r0->lo_nr && result == 0; ++i) {
 264                         struct cl_device *subdev;
 265                         struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
 266                         int ost_idx = oinfo->loi_ost_idx;
 267
 268                         if (lov_oinfo_is_dummy(oinfo))
 269                                 continue;
 270
 271                         result = ostid_to_fid(ofid, &oinfo->loi_oi,
 272                                               oinfo->loi_ost_idx);
 273                         if (result != 0)
 274                                 GOTO(out, result);
 275
 276                         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 277                         subconf->u.coc_oinfo = oinfo;
 278                         LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 279                         /* In the function below, .hs_keycmp resolves to
 280                          * lu_obj_hop_keycmp() */
 281                         /* coverity[overrun-buffer-val] */
 282                         stripe = lov_sub_find(env, subdev, ofid, subconf);
 283                         if (!IS_ERR(stripe)) {
 284                                 result = lov_init_sub(env, lov, stripe, r0, i);
 285                                 if (result == -EAGAIN) { /* try again */
 286                                         --i;
 287                                         result = 0;
 288                                         continue;
 289                                 }
 290                         } else {
 291                                 result = PTR_ERR(stripe);
 292                         }
 293
 294                         if (result == 0) {
 295                                 int sz = lov_page_slice_fixup(lov, stripe);
 296                                 LASSERT(ergo(psz > 0, psz == sz));
 297                                 psz = sz;
 298                         }
 299                 }
 300                 if (result == 0)
 301                         cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
 302         } else
 303                 result = -ENOMEM;
 304 out:
 305         RETURN(result);
 306 }
 307
 308 static int lov_init_released(const struct lu_env *env,
 309                              struct lov_device *dev, struct lov_object *lov,
 310                              struct lov_stripe_md *lsm,
 311                              const struct cl_object_conf *conf,
 312                              union lov_layout_state *state)
 313 {
 314         LASSERT(lsm != NULL);
 315         LASSERT(lsm_is_released(lsm));
 316         LASSERT(lov->lo_lsm == NULL);
 317
 318         lov->lo_lsm = lsm_addref(lsm);
 319         return 0;
 320 }
 321
 322 static struct cl_object *lov_find_subobj(const struct lu_env *env,
 323                                          struct lov_object *lov,
 324                                          struct lov_stripe_md *lsm,
 325                                          int stripe_idx)
 326 {
 327         struct lov_device       *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
 328         struct lov_oinfo        *oinfo = lsm->lsm_oinfo[stripe_idx];
 329         struct lov_thread_info  *lti = lov_env_info(env);
 330         struct lu_fid           *ofid = &lti->lti_fid;
 331         struct cl_device        *subdev;
 332         int                     ost_idx;
 333         int                     rc;
 334         struct cl_object        *result;
 335
 336         if (lov->lo_type != LLT_RAID0)
 337                 GOTO(out, result = NULL);
 338
 339         ost_idx = oinfo->loi_ost_idx;
 340         rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
 341         if (rc != 0)
 342                 GOTO(out, result = NULL);
 343
 344         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 345         result = lov_sub_find(env, subdev, ofid, NULL);
 346 out:
 347         if (result == NULL)
 348                 result = ERR_PTR(-EINVAL);
 349         return result;
 350 }
 351
 352 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 353                             union lov_layout_state *state)
 354 {
 355         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 356
 357         lov_layout_wait(env, lov);
 358         return 0;
 359 }
 360
 361 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 362                                struct lovsub_object *los, int idx)
 363 {
 364         struct cl_object        *sub;
 365         struct lov_layout_raid0 *r0;
 366         struct lu_site          *site;
 367         struct lu_site_bkt_data *bkt;
 368         wait_queue_t          *waiter;
 369
 370         r0  = &lov->u.raid0;
 371         LASSERT(r0->lo_sub[idx] == los);
 372
 373         sub  = lovsub2cl(los);
 374         site = sub->co_lu.lo_dev->ld_site;
 375         bkt  = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
 376
 377         cl_object_kill(env, sub);
 378         /* release a reference to the sub-object and ... */
 379         lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
 380         cl_object_put(env, sub);
 381
 382         /* ... wait until it is actually destroyed---sub-object clears its
 383          * ->lo_sub[] slot in lovsub_object_fini() */
 384         if (r0->lo_sub[idx] == los) {
 385                 waiter = &lov_env_info(env)->lti_waiter;
 386                 init_waitqueue_entry(waiter, current);
 387                 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
 388                 set_current_state(TASK_UNINTERRUPTIBLE);
 389                 while (1) {
 390                         /* this wait-queue is signaled at the end of
 391                          * lu_object_free(). */
 392                         set_current_state(TASK_UNINTERRUPTIBLE);
 393                         spin_lock(&r0->lo_sub_lock);
 394                         if (r0->lo_sub[idx] == los) {
 395                                 spin_unlock(&r0->lo_sub_lock);
 396                                 schedule();
 397                         } else {
 398                                 spin_unlock(&r0->lo_sub_lock);
 399                                 set_current_state(TASK_RUNNING);
 400                                 break;
 401                         }
 402                 }
 403                 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
 404         }
 405         LASSERT(r0->lo_sub[idx] == NULL);
 406 }
 407
 408 static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 409                             union lov_layout_state *state)
 410 {
 411         struct lov_layout_raid0 *r0 = &state->raid0;
 412         struct lov_stripe_md    *lsm = lov->lo_lsm;
 413         int i;
 414
 415         ENTRY;
 416
 417         dump_lsm(D_INODE, lsm);
 418
 419         lov_layout_wait(env, lov);
 420         if (r0->lo_sub != NULL) {
 421                 for (i = 0; i < r0->lo_nr; ++i) {
 422                         struct lovsub_object *los = r0->lo_sub[i];
 423
 424                         if (los != NULL) {
 425                                 cl_object_prune(env, &los->lso_cl);
 426                                 /*
 427                                  * If top-level object is to be evicted from
 428                                  * the cache, so are its sub-objects.
 429                                  */
 430                                 lov_subobject_kill(env, lov, los, i);
 431                         }
 432                 }
 433         }
 434         RETURN(0);
 435 }
 436
 437 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 438                            union lov_layout_state *state)
 439 {
 440         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 441 }
 442
 443 static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
 444                            union lov_layout_state *state)
 445 {
 446         struct lov_layout_raid0 *r0 = &state->raid0;
 447         ENTRY;
 448
 449         if (r0->lo_sub != NULL) {
 450                 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 451                 r0->lo_sub = NULL;
 452         }
 453
 454         dump_lsm(D_INODE, lov->lo_lsm);
 455         lov_free_memmd(&lov->lo_lsm);
 456
 457         EXIT;
 458 }
 459
 460 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
 461                                 union lov_layout_state *state)
 462 {
 463         ENTRY;
 464         dump_lsm(D_INODE, lov->lo_lsm);
 465         lov_free_memmd(&lov->lo_lsm);
 466         EXIT;
 467 }
 468
 469 static int lov_print_empty(const struct lu_env *env, void *cookie,
 470                            lu_printer_t p, const struct lu_object *o)
 471 {
 472         (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
 473         return 0;
 474 }
 475
 476 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 477                            lu_printer_t p, const struct lu_object *o)
 478 {
 479         struct lov_object       *lov = lu2lov(o);
 480         struct lov_layout_raid0 *r0  = lov_r0(lov);
 481         struct lov_stripe_md    *lsm = lov->lo_lsm;
 482         int                      i;
 483
 484         (*p)(env, cookie, "stripes: %d, %s, lsm{%p 0x%08X %d %u %u}:\n",
 485                 r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 486                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 487                 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
 488         for (i = 0; i < r0->lo_nr; ++i) {
 489                 struct lu_object *sub;
 490
 491                 if (r0->lo_sub[i] != NULL) {
 492                         sub = lovsub2lu(r0->lo_sub[i]);
 493                         lu_object_print(env, cookie, p, sub);
 494                 } else {
 495                         (*p)(env, cookie, "sub %d absent\n", i);
 496                 }
 497         }
 498         return 0;
 499 }
 500
 501 static int lov_print_released(const struct lu_env *env, void *cookie,
 502                                 lu_printer_t p, const struct lu_object *o)
 503 {
 504         struct lov_object       *lov = lu2lov(o);
 505         struct lov_stripe_md    *lsm = lov->lo_lsm;
 506
 507         (*p)(env, cookie,
 508                 "released: %s, lsm{%p 0x%08X %d %u %u}:\n",
 509                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 510                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 511                 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
 512         return 0;
 513 }
 514
 515 /**
 516  * Implements cl_object_operations::coo_attr_get() method for an object
 517  * without stripes (LLT_EMPTY layout type).
 518  *
 519  * The only attributes this layer is authoritative in this case is
 520  * cl_attr::cat_blocks---it's 0.
 521  */
 522 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 523                               struct cl_attr *attr)
 524 {
 525         attr->cat_blocks = 0;
 526         return 0;
 527 }
 528
 529 static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
 530                               struct cl_attr *attr)
 531 {
 532         struct lov_object       *lov = cl2lov(obj);
 533         struct lov_layout_raid0 *r0 = lov_r0(lov);
 534         struct cl_attr          *lov_attr = &r0->lo_attr;
 535         int                      result = 0;
 536
 537         ENTRY;
 538
 539         /* this is called w/o holding type guard mutex, so it must be inside
 540          * an on going IO otherwise lsm may be replaced.
 541          * LU-2117: it turns out there exists one exception. For mmaped files,
 542          * the lock of those files may be requested in the other file's IO
 543          * context, and this function is called in ccc_lock_state(), it will
 544          * hit this assertion.
 545          * Anyway, it's still okay to call attr_get w/o type guard as layout
 546          * can't go if locks exist. */
 547         /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
 548
 549         if (!r0->lo_attr_valid) {
 550                 struct lov_stripe_md    *lsm = lov->lo_lsm;
 551                 struct ost_lvb          *lvb = &lov_env_info(env)->lti_lvb;
 552                 __u64                    kms = 0;
 553
 554                 memset(lvb, 0, sizeof(*lvb));
 555                 /* XXX: timestamps can be negative by sanity:test_39m,
 556                  * how can it be? */
 557                 lvb->lvb_atime = LLONG_MIN;
 558                 lvb->lvb_ctime = LLONG_MIN;
 559                 lvb->lvb_mtime = LLONG_MIN;
 560
 561                 /*
 562                  * XXX that should be replaced with a loop over sub-objects,
 563                  * doing cl_object_attr_get() on them. But for now, let's
 564                  * reuse old lov code.
 565                  */
 566
 567                 /*
 568                  * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 569                  * happy. It's not needed, because new code uses
 570                  * ->coh_attr_guard spin-lock to protect consistency of
 571                  * sub-object attributes.
 572                  */
 573                 lov_stripe_lock(lsm);
 574                 result = lov_merge_lvb_kms(lsm, lvb, &kms);
 575                 lov_stripe_unlock(lsm);
 576                 if (result == 0) {
 577                         cl_lvb2attr(lov_attr, lvb);
 578                         lov_attr->cat_kms = kms;
 579                         r0->lo_attr_valid = 1;
 580                 }
 581         }
 582         if (result == 0) { /* merge results */
 583                 attr->cat_blocks = lov_attr->cat_blocks;
 584                 attr->cat_size = lov_attr->cat_size;
 585                 attr->cat_kms = lov_attr->cat_kms;
 586                 if (attr->cat_atime < lov_attr->cat_atime)
 587                         attr->cat_atime = lov_attr->cat_atime;
 588                 if (attr->cat_ctime < lov_attr->cat_ctime)
 589                         attr->cat_ctime = lov_attr->cat_ctime;
 590                 if (attr->cat_mtime < lov_attr->cat_mtime)
 591                         attr->cat_mtime = lov_attr->cat_mtime;
 592         }
 593         RETURN(result);
 594 }
 595
 596 static int lov_find_cbdata_empty(const struct lu_env *env,
 597                                  struct cl_object *obj, ldlm_iterator_t iter,
 598                                  void *data)
 599 {
 600         return 0;
 601 }
 602
 603 static int lov_find_cbdata_raid0(const struct lu_env *env,
 604                                  struct cl_object *obj, ldlm_iterator_t iter,
 605                                  void *data)
 606 {
 607         struct lov_object       *lov = cl2lov(obj);
 608         struct lov_layout_raid0 *r0 = lov_r0(lov);
 609         struct cl_object        *subobj;
 610         int                     i;
 611         int                     rc = 0;
 612
 613         for (i = 0; i < r0->lo_nr; ++i) {
 614                 if (r0->lo_sub[i] == NULL)
 615                         continue;
 616
 617                 subobj = lovsub2cl(r0->lo_sub[i]);
 618
 619                 rc = cl_object_find_cbdata(env, subobj, iter, data);
 620                 if (rc != 0)
 621                         break;
 622         }
 623
 624         return rc;
 625 }
 626
 627 const static struct lov_layout_operations lov_dispatch[] = {
 628         [LLT_EMPTY] = {
 629                 .llo_init      = lov_init_empty,
 630                 .llo_delete    = lov_delete_empty,
 631                 .llo_fini      = lov_fini_empty,
 632                 .llo_install   = lov_install_empty,
 633                 .llo_print     = lov_print_empty,
 634                 .llo_page_init = lov_page_init_empty,
 635                 .llo_lock_init = lov_lock_init_empty,
 636                 .llo_io_init   = lov_io_init_empty,
 637                 .llo_getattr   = lov_attr_get_empty,
 638                 .llo_find_cbdata = lov_find_cbdata_empty
 639         },
 640         [LLT_RAID0] = {
 641                 .llo_init      = lov_init_raid0,
 642                 .llo_delete    = lov_delete_raid0,
 643                 .llo_fini      = lov_fini_raid0,
 644                 .llo_install   = lov_install_raid0,
 645                 .llo_print     = lov_print_raid0,
 646                 .llo_page_init = lov_page_init_raid0,
 647                 .llo_lock_init = lov_lock_init_raid0,
 648                 .llo_io_init   = lov_io_init_raid0,
 649                 .llo_getattr   = lov_attr_get_raid0,
 650                 .llo_find_cbdata = lov_find_cbdata_raid0
 651         },
 652         [LLT_RELEASED] = {
 653                 .llo_init      = lov_init_released,
 654                 .llo_delete    = lov_delete_empty,
 655                 .llo_fini      = lov_fini_released,
 656                 .llo_install   = lov_install_empty,
 657                 .llo_print     = lov_print_released,
 658                 .llo_page_init = lov_page_init_empty,
 659                 .llo_lock_init = lov_lock_init_empty,
 660                 .llo_io_init   = lov_io_init_released,
 661                 .llo_getattr   = lov_attr_get_empty,
 662                 .llo_find_cbdata = lov_find_cbdata_empty
 663         }
 664 };
 665
 666 /**
 667  * Performs a double-dispatch based on the layout type of an object.
 668  */
 669 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)                              \
 670 ({                                                                      \
 671         struct lov_object                      *__obj = (obj);          \
 672         enum lov_layout_type                    __llt;                  \
 673                                                                         \
 674         __llt = __obj->lo_type;                                         \
 675         LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch));        \
 676         lov_dispatch[__llt].op(__VA_ARGS__);                            \
 677 })
 678
 679 /**
 680  * Return lov_layout_type associated with a given lsm
 681  */
 682 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
 683 {
 684         if (lsm == NULL)
 685                 return LLT_EMPTY;
 686         if (lsm_is_released(lsm))
 687                 return LLT_RELEASED;
 688         return LLT_RAID0;
 689 }
 690
 691 static inline void lov_conf_freeze(struct lov_object *lov)
 692 {
 693         if (lov->lo_owner != current)
 694                 down_read(&lov->lo_type_guard);
 695 }
 696
 697 static inline void lov_conf_thaw(struct lov_object *lov)
 698 {
 699         if (lov->lo_owner != current)
 700                 up_read(&lov->lo_type_guard);
 701 }
 702
 703 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
 704 ({                                                                      \
 705         struct lov_object                      *__obj = (obj);          \
 706         int                                     __lock = !!(lock);      \
 707         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
 708                                                                         \
 709         if (__lock)                                                     \
 710                 lov_conf_freeze(__obj);                                 \
 711         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
 712         if (__lock)                                                     \
 713                 lov_conf_thaw(__obj);                                   \
 714         __result;                                                       \
 715 })
 716
 717 /**
 718  * Performs a locked double-dispatch based on the layout type of an object.
 719  */
 720 #define LOV_2DISPATCH(obj, op, ...)                     \
 721         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
 722
 723 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
 724 do {                                                                    \
 725         struct lov_object                      *__obj = (obj);          \
 726         enum lov_layout_type                    __llt;                  \
 727                                                                         \
 728         lov_conf_freeze(__obj);                                         \
 729         __llt = __obj->lo_type;                                         \
 730         LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch));        \
 731         lov_dispatch[__llt].op(__VA_ARGS__);                            \
 732         lov_conf_thaw(__obj);                                           \
 733 } while (0)
 734
 735 static void lov_conf_lock(struct lov_object *lov)
 736 {
 737         LASSERT(lov->lo_owner != current);
 738         down_write(&lov->lo_type_guard);
 739         LASSERT(lov->lo_owner == NULL);
 740         lov->lo_owner = current;
 741 }
 742
 743 static void lov_conf_unlock(struct lov_object *lov)
 744 {
 745         lov->lo_owner = NULL;
 746         up_write(&lov->lo_type_guard);
 747 }
 748
 749 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
 750 {
 751         struct l_wait_info lwi = { 0 };
 752         ENTRY;
 753
 754         while (atomic_read(&lov->lo_active_ios) > 0) {
 755                 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
 756                         PFID(lu_object_fid(lov2lu(lov))),
 757                         atomic_read(&lov->lo_active_ios));
 758
 759                 l_wait_event(lov->lo_waitq,
 760                              atomic_read(&lov->lo_active_ios) == 0, &lwi);
 761         }
 762         RETURN(0);
 763 }
 764
 765 static int lov_layout_change(const struct lu_env *unused,
 766                              struct lov_object *lov, struct lov_stripe_md *lsm,
 767                              const struct cl_object_conf *conf)
 768 {
 769         enum lov_layout_type llt = lov_type(lsm);
 770         union lov_layout_state *state = &lov->u;
 771         const struct lov_layout_operations *old_ops;
 772         const struct lov_layout_operations *new_ops;
 773         void *cookie;
 774         struct lu_env *env;
 775         __u16 refcheck;
 776         int rc;
 777         ENTRY;
 778
 779         LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
 780
 781         cookie = cl_env_reenter();
 782         env = cl_env_get(&refcheck);
 783         if (IS_ERR(env)) {
 784                 cl_env_reexit(cookie);
 785                 RETURN(PTR_ERR(env));
 786         }
 787
 788         LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
 789
 790         CDEBUG(D_INODE, DFID" from %s to %s\n",
 791                PFID(lu_object_fid(lov2lu(lov))),
 792                llt2str(lov->lo_type), llt2str(llt));
 793
 794         old_ops = &lov_dispatch[lov->lo_type];
 795         new_ops = &lov_dispatch[llt];
 796
 797         rc = cl_object_prune(env, &lov->lo_cl);
 798         if (rc != 0)
 799                 GOTO(out, rc);
 800
 801         rc = old_ops->llo_delete(env, lov, &lov->u);
 802         if (rc != 0)
 803                 GOTO(out, rc);
 804
 805         old_ops->llo_fini(env, lov, &lov->u);
 806
 807         LASSERT(atomic_read(&lov->lo_active_ios) == 0);
 808
 809         lov->lo_type = LLT_EMPTY;
 810
 811         /* page bufsize fixup */
 812         cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
 813                 lov_page_slice_fixup(lov, NULL);
 814
 815         rc = new_ops->llo_init(env, lov_object_dev(lov), lov, lsm, conf, state);
 816         if (rc != 0) {
 817                 new_ops->llo_delete(env, lov, state);
 818                 new_ops->llo_fini(env, lov, state);
 819                 /* this file becomes an EMPTY file. */
 820                 GOTO(out, rc);
 821         }
 822
 823         new_ops->llo_install(env, lov, state);
 824         lov->lo_type = llt;
 825
 826 out:
 827         cl_env_put(env, &refcheck);
 828         cl_env_reexit(cookie);
 829
 830         RETURN(rc);
 831 }
 832
 833 /*****************************************************************************
 834  *
 835  * Lov object operations.
 836  *
 837  */
 838 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
 839                     const struct lu_object_conf *conf)
 840 {
 841         struct lov_object            *lov   = lu2lov(obj);
 842         struct lov_device            *dev   = lov_object_dev(lov);
 843         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
 844         union lov_layout_state       *set   = &lov->u;
 845         const struct lov_layout_operations *ops;
 846         struct lov_stripe_md *lsm = NULL;
 847         int rc;
 848         ENTRY;
 849
 850         init_rwsem(&lov->lo_type_guard);
 851         atomic_set(&lov->lo_active_ios, 0);
 852         init_waitqueue_head(&lov->lo_waitq);
 853         cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
 854
 855         lov->lo_type = LLT_EMPTY;
 856         if (cconf->u.coc_layout.lb_buf != NULL) {
 857                 lsm = lov_unpackmd(dev->ld_lov,
 858                                    cconf->u.coc_layout.lb_buf,
 859                                    cconf->u.coc_layout.lb_len);
 860                 if (IS_ERR(lsm))
 861                         RETURN(PTR_ERR(lsm));
 862         }
 863
 864         /* no locking is necessary, as object is being created */
 865         lov->lo_type = lov_type(lsm);
 866         ops = &lov_dispatch[lov->lo_type];
 867         rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
 868         if (rc != 0)
 869                 GOTO(out_lsm, rc);
 870
 871         ops->llo_install(env, lov, set);
 872
 873 out_lsm:
 874         lov_lsm_put(lsm);
 875
 876         RETURN(rc);
 877 }
 878
 879 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
 880                         const struct cl_object_conf *conf)
 881 {
 882         struct lov_stripe_md    *lsm = NULL;
 883         struct lov_object       *lov = cl2lov(obj);
 884         int                      result = 0;
 885         ENTRY;
 886
 887         if (conf->coc_opc == OBJECT_CONF_SET &&
 888             conf->u.coc_layout.lb_buf != NULL) {
 889                 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
 890                                    conf->u.coc_layout.lb_buf,
 891                                    conf->u.coc_layout.lb_len);
 892                 if (IS_ERR(lsm))
 893                         RETURN(PTR_ERR(lsm));
 894         }
 895
 896         lov_conf_lock(lov);
 897         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
 898                 lov->lo_layout_invalid = true;
 899                 GOTO(out, result = 0);
 900         }
 901
 902         if (conf->coc_opc == OBJECT_CONF_WAIT) {
 903                 if (lov->lo_layout_invalid &&
 904                     atomic_read(&lov->lo_active_ios) > 0) {
 905                         lov_conf_unlock(lov);
 906                         result = lov_layout_wait(env, lov);
 907                         lov_conf_lock(lov);
 908                 }
 909                 GOTO(out, result);
 910         }
 911
 912         LASSERT(conf->coc_opc == OBJECT_CONF_SET);
 913
 914         if ((lsm == NULL && lov->lo_lsm == NULL) ||
 915             ((lsm != NULL && lov->lo_lsm != NULL) &&
 916              (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
 917              (lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) {
 918                 /* same version of layout */
 919                 lov->lo_layout_invalid = false;
 920                 GOTO(out, result = 0);
 921         }
 922
 923         /* will change layout - check if there still exists active IO. */
 924         if (atomic_read(&lov->lo_active_ios) > 0) {
 925                 lov->lo_layout_invalid = true;
 926                 GOTO(out, result = -EBUSY);
 927         }
 928
 929         result = lov_layout_change(env, lov, lsm, conf);
 930         lov->lo_layout_invalid = result != 0;
 931         EXIT;
 932
 933 out:
 934         lov_conf_unlock(lov);
 935         lov_lsm_put(lsm);
 936         CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
 937                PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
 938         RETURN(result);
 939 }
 940
 941 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
 942 {
 943         struct lov_object *lov = lu2lov(obj);
 944
 945         ENTRY;
 946         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
 947         EXIT;
 948 }
 949
 950 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
 951 {
 952         struct lov_object *lov = lu2lov(obj);
 953
 954         ENTRY;
 955         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
 956         lu_object_fini(obj);
 957         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
 958         EXIT;
 959 }
 960
 961 static int lov_object_print(const struct lu_env *env, void *cookie,
 962                             lu_printer_t p, const struct lu_object *o)
 963 {
 964         return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
 965 }
 966
 967 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
 968                   struct cl_page *page, pgoff_t index)
 969 {
 970         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
 971                                     index);
 972 }
 973
 974 /**
 975  * Implements cl_object_operations::clo_io_init() method for lov
 976  * layer. Dispatches to the appropriate layout io initialization method.
 977  */
 978 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
 979                 struct cl_io *io)
 980 {
 981         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
 982         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
 983                                      !io->ci_ignore_layout, env, obj, io);
 984 }
 985
 986 /**
 987  * An implementation of cl_object_operations::clo_attr_get() method for lov
 988  * layer. For raid0 layout this collects and merges attributes of all
 989  * sub-objects.
 990  */
 991 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
 992                         struct cl_attr *attr)
 993 {
 994         /* do not take lock, as this function is called under a
 995          * spin-lock. Layout is protected from changing by ongoing IO. */
 996         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
 997 }
 998
 999 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1000                            const struct cl_attr *attr, unsigned valid)
1001 {
1002         /*
1003          * No dispatch is required here, as no layout implements this.
1004          */
1005         return 0;
1006 }
1007
1008 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1009                   struct cl_lock *lock, const struct cl_io *io)
1010 {
1011         /* No need to lock because we've taken one refcount of layout.  */
1012         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1013                                     io);
1014 }
1015
1016 /**
1017  * We calculate on which OST the mapping will end. If the length of mapping
1018  * is greater than (stripe_size * stripe_count) then the last_stripe will
1019  * will be one just before start_stripe. Else we check if the mapping
1020  * intersects each OST and find last_stripe.
1021  * This function returns the last_stripe and also sets the stripe_count
1022  * over which the mapping is spread
1023  *
1024  * \param lsm [in]              striping information for the file
1025  * \param fm_start [in]         logical start of mapping
1026  * \param fm_end [in]           logical end of mapping
1027  * \param start_stripe [in]     starting stripe of the mapping
1028  * \param stripe_count [out]    the number of stripes across which to map is
1029  *                              returned
1030  *
1031  * \retval last_stripe          return the last stripe of the mapping
1032  */
1033 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm,
1034                                    loff_t fm_start, loff_t fm_end,
1035                                    int start_stripe, int *stripe_count)
1036 {
1037         int last_stripe;
1038         loff_t obd_start;
1039         loff_t obd_end;
1040         int i, j;
1041
1042         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
1043                 last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
1044                                                               start_stripe - 1);
1045                 *stripe_count = lsm->lsm_stripe_count;
1046         } else {
1047                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
1048                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
1049                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
1050                                                    &obd_start, &obd_end)) == 0)
1051                                 break;
1052                 }
1053                 *stripe_count = j;
1054                 last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count;
1055         }
1056
1057         return last_stripe;
1058 }
1059
1060 /**
1061  * Set fe_device and copy extents from local buffer into main return buffer.
1062  *
1063  * \param fiemap [out]          fiemap to hold all extents
1064  * \param lcl_fm_ext [in]       array of fiemap extents get from OSC layer
1065  * \param ost_index [in]        OST index to be written into the fm_device
1066  *                              field for each extent
1067  * \param ext_count [in]        number of extents to be copied
1068  * \param current_extent [in]   where to start copying in the extent array
1069  */
1070 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1071                                          struct fiemap_extent *lcl_fm_ext,
1072                                          int ost_index, unsigned int ext_count,
1073                                          int current_extent)
1074 {
1075         char            *to;
1076         unsigned int    ext;
1077
1078         for (ext = 0; ext < ext_count; ext++) {
1079                 lcl_fm_ext[ext].fe_device = ost_index;
1080                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1081         }
1082
1083         /* Copy fm_extent's from fm_local to return buffer */
1084         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1085         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1086 }
1087
1088 #define FIEMAP_BUFFER_SIZE 4096
1089
1090 /**
1091  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1092  * call. The local end offset and the device are sent in the first
1093  * fm_extent. This function calculates the stripe number from the index.
1094  * This function returns a stripe_no on which mapping is to be restarted.
1095  *
1096  * This function returns fm_end_offset which is the in-OST offset at which
1097  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1098  * will re-calculate proper offset in next stripe.
1099  * Note that the first extent is passed to lov_get_info via the value field.
1100  *
1101  * \param fiemap [in]           fiemap request header
1102  * \param lsm [in]              striping information for the file
1103  * \param fm_start [in]         logical start of mapping
1104  * \param fm_end [in]           logical end of mapping
1105  * \param start_stripe [out]    starting stripe will be returned in this
1106  */
1107 static loff_t fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1108                                         struct lov_stripe_md *lsm,
1109                                         loff_t fm_start, loff_t fm_end,
1110                                         int *start_stripe)
1111 {
1112         loff_t local_end = fiemap->fm_extents[0].fe_logical;
1113         loff_t lun_start;
1114         loff_t lun_end;
1115         loff_t fm_end_offset;
1116         int stripe_no = -1;
1117         int i;
1118
1119         if (fiemap->fm_extent_count == 0 ||
1120             fiemap->fm_extents[0].fe_logical == 0)
1121                 return 0;
1122
1123         /* Find out stripe_no from ost_index saved in the fe_device */
1124         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1125                 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
1126
1127                 if (lov_oinfo_is_dummy(oinfo))
1128                         continue;
1129
1130                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1131                         stripe_no = i;
1132                         break;
1133                 }
1134         }
1135
1136         if (stripe_no == -1)
1137                 return -EINVAL;
1138
1139         /* If we have finished mapping on previous device, shift logical
1140          * offset to start of next device */
1141         if (lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
1142                                   &lun_start, &lun_end) != 0 &&
1143             local_end < lun_end) {
1144                 fm_end_offset = local_end;
1145                 *start_stripe = stripe_no;
1146         } else {
1147                 /* This is a special value to indicate that caller should
1148                  * calculate offset in next stripe. */
1149                 fm_end_offset = 0;
1150                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
1151         }
1152
1153         return fm_end_offset;
1154 }
1155
1156 /**
1157  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1158  * This also handles the restarting of FIEMAP calls in case mapping overflows
1159  * the available number of extents in single call.
1160  *
1161  * \param env [in]              lustre environment
1162  * \param obj [in]              file object
1163  * \param fmkey [in]            fiemap request header and other info
1164  * \param fiemap [out]          fiemap buffer holding retrived map extents
1165  * \param buflen [in/out]       max buffer length of @fiemap, when iterate
1166  *                              each OST, it is used to limit max map needed
1167  * \retval 0    success
1168  * \retval < 0  error
1169  */
1170 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1171                              struct ll_fiemap_info_key *fmkey,
1172                              struct fiemap *fiemap, size_t *buflen)
1173 {
1174         struct lov_stripe_md    *lsm;
1175         struct cl_object        *subobj = NULL;
1176         struct lov_obd          *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1177         struct fiemap           *fm_local = NULL;
1178         struct fiemap_extent    *lcl_fm_ext;
1179         loff_t                  fm_start;
1180         loff_t                  fm_end;
1181         loff_t                  fm_length;
1182         loff_t                  fm_end_offset;
1183         int                     count_local;
1184         int                     ost_index = 0;
1185         int                     start_stripe;
1186         int                     current_extent = 0;
1187         int                     rc = 0;
1188         int                     last_stripe;
1189         int                     cur_stripe = 0;
1190         int                     cur_stripe_wrap = 0;
1191         int                     stripe_count;
1192         unsigned int            buffer_size = FIEMAP_BUFFER_SIZE;
1193         /* Whether have we collected enough extents */
1194         bool                    enough = false;
1195         /* EOF for object */
1196         bool                    ost_eof = false;
1197         /* done with required mapping for this OST? */
1198         bool                    ost_done = false;
1199         ENTRY;
1200
1201         lsm = lov_lsm_addref(cl2lov(obj));
1202         if (lsm == NULL)
1203                 RETURN(-ENODATA);
1204
1205         /**
1206          * If the stripe_count > 1 and the application does not understand
1207          * DEVICE_ORDER flag, it cannot interpret the extents correctly.
1208          */
1209         if (lsm->lsm_stripe_count > 1 && !(fiemap->fm_flags &
1210                                            FIEMAP_FLAG_DEVICE_ORDER))
1211                 GOTO(out, rc = -ENOTSUPP);
1212
1213         if (lsm_is_released(lsm)) {
1214                 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1215                         /**
1216                          * released file, return a minimal FIEMAP if
1217                          * request fits in file-size.
1218                          */
1219                         fiemap->fm_mapped_extents = 1;
1220                         fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1221                         if (fiemap->fm_start + fiemap->fm_length <
1222                             fmkey->lfik_oa.o_size)
1223                                 fiemap->fm_extents[0].fe_length =
1224                                         fiemap->fm_length;
1225                         else
1226                                 fiemap->fm_extents[0].fe_length =
1227                                         fmkey->lfik_oa.o_size -
1228                                         fiemap->fm_start;
1229                         fiemap->fm_extents[0].fe_flags |=
1230                                 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1231                 }
1232                 GOTO(out, rc = 0);
1233         }
1234
1235         if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1236                 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1237
1238         OBD_ALLOC_LARGE(fm_local, buffer_size);
1239         if (fm_local == NULL)
1240                 GOTO(out, rc = -ENOMEM);
1241         lcl_fm_ext = &fm_local->fm_extents[0];
1242         count_local = fiemap_size_to_count(buffer_size);
1243
1244         fm_start = fiemap->fm_start;
1245         fm_length = fiemap->fm_length;
1246         /* Calculate start stripe, last stripe and length of mapping */
1247         start_stripe = lov_stripe_number(lsm, fm_start);
1248         fm_end = (fm_length == ~0ULL) ? fmkey->lfik_oa.o_size :
1249                                         fm_start + fm_length - 1;
1250         /* If fm_length != ~0ULL but fm_start_fm_length-1 exceeds file size */
1251         if (fm_end > fmkey->lfik_oa.o_size)
1252                 fm_end = fmkey->lfik_oa.o_size;
1253
1254         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
1255                                               start_stripe, &stripe_count);
1256         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start, fm_end,
1257                                                   &start_stripe);
1258         if (fm_end_offset == -EINVAL)
1259                 GOTO(out, rc = -EINVAL);
1260
1261         /**
1262          * Requested extent count exceeds the fiemap buffer size, shrink our
1263          * ambition.
1264          */
1265         if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1266                 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1267         if (fiemap->fm_extent_count == 0)
1268                 count_local = 0;
1269
1270         /* Check each stripe */
1271         for (cur_stripe = start_stripe; stripe_count > 0;
1272              --stripe_count,
1273              cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
1274                 loff_t req_fm_len; /* Stores length of required mapping */
1275                 loff_t len_mapped_single_call;
1276                 loff_t lun_start;
1277                 loff_t lun_end;
1278                 loff_t obd_object_end;
1279                 unsigned int ext_count;
1280
1281                 cur_stripe_wrap = cur_stripe;
1282
1283                 /* Find out range of mapping on this stripe */
1284                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
1285                                            &lun_start, &obd_object_end)) == 0)
1286                         continue;
1287
1288                 if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe]))
1289                         GOTO(out, rc = -EIO);
1290
1291                 /* If this is a continuation FIEMAP call and we are on
1292                  * starting stripe then lun_start needs to be set to
1293                  * fm_end_offset */
1294                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
1295                         lun_start = fm_end_offset;
1296
1297                 if (fm_length != ~0ULL) {
1298                         /* Handle fm_start + fm_length overflow */
1299                         if (fm_start + fm_length < fm_start)
1300                                 fm_length = ~0ULL - fm_start;
1301                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
1302                                                      cur_stripe);
1303                 } else {
1304                         lun_end = ~0ULL;
1305                 }
1306
1307                 if (lun_start == lun_end)
1308                         continue;
1309
1310                 req_fm_len = obd_object_end - lun_start;
1311                 fm_local->fm_length = 0;
1312                 len_mapped_single_call = 0;
1313
1314                 /* find lobsub object */
1315                 subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1316                                              cur_stripe);
1317                 if (IS_ERR(subobj))
1318                         GOTO(out, rc = PTR_ERR(subobj));
1319                 /* If the output buffer is very large and the objects have many
1320                  * extents we may need to loop on a single OST repeatedly */
1321                 ost_eof = false;
1322                 ost_done = false;
1323                 do {
1324                         if (fiemap->fm_extent_count > 0) {
1325                                 /* Don't get too many extents. */
1326                                 if (current_extent + count_local >
1327                                     fiemap->fm_extent_count)
1328                                         count_local = fiemap->fm_extent_count -
1329                                                       current_extent;
1330                         }
1331
1332                         lun_start += len_mapped_single_call;
1333                         fm_local->fm_length = req_fm_len -
1334                                               len_mapped_single_call;
1335                         req_fm_len = fm_local->fm_length;
1336                         fm_local->fm_extent_count = enough ? 1 : count_local;
1337                         fm_local->fm_mapped_extents = 0;
1338                         fm_local->fm_flags = fiemap->fm_flags;
1339
1340                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
1341
1342                         if (ost_index < 0 ||
1343                             ost_index >= lov->desc.ld_tgt_count)
1344                                 GOTO(obj_put, rc = -EINVAL);
1345                         /* If OST is inactive, return extent with UNKNOWN
1346                          * flag. */
1347                         if (!lov->lov_tgts[ost_index]->ltd_active) {
1348                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
1349                                 fm_local->fm_mapped_extents = 1;
1350
1351                                 lcl_fm_ext[0].fe_logical = lun_start;
1352                                 lcl_fm_ext[0].fe_length = obd_object_end -
1353                                                           lun_start;
1354                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1355
1356                                 goto inactive_tgt;
1357                         }
1358
1359                         fm_local->fm_start = lun_start;
1360                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1361                         memcpy(&fmkey->lfik_fiemap, fm_local,
1362                                sizeof(*fm_local));
1363                         *buflen = fiemap_count_to_size(
1364                                                 fm_local->fm_extent_count);
1365
1366                         rc = cl_object_fiemap(env, subobj, fmkey, fm_local,
1367                                               buflen);
1368                         if (rc != 0)
1369                                 GOTO(obj_put, rc);
1370 inactive_tgt:
1371                         ext_count = fm_local->fm_mapped_extents;
1372                         if (ext_count == 0) {
1373                                 ost_done = true;
1374                                 /* If last stripe has hold at the end,
1375                                  * we need to return */
1376                                 if (cur_stripe_wrap == last_stripe) {
1377                                         fiemap->fm_mapped_extents = 0;
1378                                         goto finish;
1379                                 }
1380                                 break;
1381                         } else if (enough) {
1382                                 /*
1383                                  * We've collected enough extents and there are
1384                                  * more extents after it.
1385                                  */
1386                                 goto finish;
1387                         }
1388
1389                         /* If we just need num of extents, got to next device */
1390                         if (fiemap->fm_extent_count == 0) {
1391                                 current_extent += ext_count;
1392                                 break;
1393                         }
1394
1395                         /* prepare to copy retrived map extents */
1396                         len_mapped_single_call =
1397                                 lcl_fm_ext[ext_count - 1].fe_logical -
1398                                 lun_start + lcl_fm_ext[ext_count - 1].fe_length;
1399
1400                         /* Have we finished mapping on this device? */
1401                         if (req_fm_len <= len_mapped_single_call)
1402                                 ost_done = true;
1403
1404                         /* Clear the EXTENT_LAST flag which can be present on
1405                          * the last extent */
1406                         if (lcl_fm_ext[ext_count - 1].fe_flags &
1407                             FIEMAP_EXTENT_LAST)
1408                                 lcl_fm_ext[ext_count - 1].fe_flags &=
1409                                                         ~FIEMAP_EXTENT_LAST;
1410                         if (lov_stripe_size(lsm,
1411                                         lcl_fm_ext[ext_count - 1].fe_logical +
1412                                         lcl_fm_ext[ext_count - 1].fe_length,
1413                                         cur_stripe) >= fmkey->lfik_oa.o_size)
1414                                 ost_eof = true;
1415
1416                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
1417                                                      ost_index, ext_count,
1418                                                      current_extent);
1419                         current_extent += ext_count;
1420
1421                         /* Ran out of available extents? */
1422                         if (current_extent >= fiemap->fm_extent_count)
1423                                 enough = true;
1424                 } while (!ost_done && !ost_eof);
1425
1426                 cl_object_put(env, subobj);
1427                 subobj = NULL;
1428
1429                 if (cur_stripe_wrap == last_stripe)
1430                         goto finish;
1431         } /* for each stripe */
1432 finish:
1433         /* Indicate that we are returning device offsets unless file just has
1434          * single stripe */
1435         if (lsm->lsm_stripe_count > 1)
1436                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1437
1438         if (fiemap->fm_extent_count == 0)
1439                 goto skip_last_device_calc;
1440
1441         /* Check if we have reached the last stripe and whether mapping for that
1442          * stripe is done. */
1443         if ((cur_stripe_wrap == last_stripe) && (ost_done || ost_eof))
1444                 fiemap->fm_extents[current_extent - 1].fe_flags |=
1445                                                              FIEMAP_EXTENT_LAST;
1446 skip_last_device_calc:
1447         fiemap->fm_mapped_extents = current_extent;
1448 obj_put:
1449         if (subobj != NULL)
1450                 cl_object_put(env, subobj);
1451 out:
1452         if (fm_local != NULL)
1453                 OBD_FREE_LARGE(fm_local, buffer_size);
1454
1455         lov_lsm_put(lsm);
1456
1457         return rc;
1458 }
1459
1460 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
1461                                 struct lov_user_md __user *lum)
1462 {
1463         struct lov_object       *lov = cl2lov(obj);
1464         struct lov_stripe_md    *lsm;
1465         int                     rc = 0;
1466         ENTRY;
1467
1468         lsm = lov_lsm_addref(lov);
1469         if (lsm == NULL)
1470                 RETURN(-ENODATA);
1471
1472         rc = lov_getstripe(cl2lov(obj), lsm, lum);
1473         lov_lsm_put(lsm);
1474         RETURN(rc);
1475 }
1476
1477 static int lov_object_layout_get(const struct lu_env *env,
1478                                  struct cl_object *obj,
1479                                  struct cl_layout *cl)
1480 {
1481         struct lov_object *lov = cl2lov(obj);
1482         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
1483         struct lu_buf *buf = &cl->cl_buf;
1484         ssize_t rc;
1485         ENTRY;
1486
1487         if (lsm == NULL) {
1488                 cl->cl_size = 0;
1489                 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
1490
1491                 RETURN(0);
1492         }
1493
1494         cl->cl_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic);
1495         cl->cl_layout_gen = lsm->lsm_layout_gen;
1496
1497         rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
1498         lov_lsm_put(lsm);
1499
1500         RETURN(rc < 0 ? rc : 0);
1501 }
1502
1503 static loff_t lov_object_maxbytes(struct cl_object *obj)
1504 {
1505         struct lov_object *lov = cl2lov(obj);
1506         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
1507         loff_t maxbytes;
1508
1509         if (lsm == NULL)
1510                 return LLONG_MAX;
1511
1512         maxbytes = lsm->lsm_maxbytes;
1513
1514         lov_lsm_put(lsm);
1515
1516         return maxbytes;
1517 }
1518
1519 static int lov_object_find_cbdata(const struct lu_env *env,
1520                                   struct cl_object *obj, ldlm_iterator_t iter,
1521                                   void *data)
1522 {
1523         int rc;
1524         ENTRY;
1525
1526         /* call cl_object_find_cbdata for sub obj */
1527         rc = LOV_2DISPATCH(cl2lov(obj), llo_find_cbdata, env, obj, iter, data);
1528         RETURN(rc);
1529 }
1530
1531 static const struct cl_object_operations lov_ops = {
1532         .coo_page_init    = lov_page_init,
1533         .coo_lock_init    = lov_lock_init,
1534         .coo_io_init      = lov_io_init,
1535         .coo_attr_get     = lov_attr_get,
1536         .coo_attr_update  = lov_attr_update,
1537         .coo_conf_set     = lov_conf_set,
1538         .coo_getstripe    = lov_object_getstripe,
1539         .coo_layout_get   = lov_object_layout_get,
1540         .coo_maxbytes     = lov_object_maxbytes,
1541         .coo_find_cbdata  = lov_object_find_cbdata,
1542         .coo_fiemap       = lov_object_fiemap,
1543 };
1544
1545 static const struct lu_object_operations lov_lu_obj_ops = {
1546         .loo_object_init      = lov_object_init,
1547         .loo_object_delete    = lov_object_delete,
1548         .loo_object_release   = NULL,
1549         .loo_object_free      = lov_object_free,
1550         .loo_object_print     = lov_object_print,
1551         .loo_object_invariant = NULL
1552 };
1553
1554 struct lu_object *lov_object_alloc(const struct lu_env *env,
1555                                    const struct lu_object_header *unused,
1556                                    struct lu_device *dev)
1557 {
1558         struct lov_object *lov;
1559         struct lu_object  *obj;
1560
1561         ENTRY;
1562         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
1563         if (lov != NULL) {
1564                 obj = lov2lu(lov);
1565                 lu_object_init(obj, NULL, dev);
1566                 lov->lo_cl.co_ops = &lov_ops;
1567                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
1568                 /*
1569                  * object io operation vector (cl_object::co_iop) is installed
1570                  * later in lov_object_init(), as different vectors are used
1571                  * for object with different layouts.
1572                  */
1573                 obj->lo_ops = &lov_lu_obj_ops;
1574         } else
1575                 obj = NULL;
1576         RETURN(obj);
1577 }
1578
1579 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
1580 {
1581         struct lov_stripe_md *lsm = NULL;
1582
1583         lov_conf_freeze(lov);
1584         if (lov->lo_lsm != NULL) {
1585                 lsm = lsm_addref(lov->lo_lsm);
1586                 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
1587                         lsm, atomic_read(&lsm->lsm_refc),
1588                         lov->lo_layout_invalid, current);
1589         }
1590         lov_conf_thaw(lov);
1591         return lsm;
1592 }
1593
1594 int lov_read_and_clear_async_rc(struct cl_object *clob)
1595 {
1596         struct lu_object *luobj;
1597         int rc = 0;
1598         ENTRY;
1599
1600         luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
1601                                  &lov_device_type);
1602         if (luobj != NULL) {
1603                 struct lov_object *lov = lu2lov(luobj);
1604
1605                 lov_conf_freeze(lov);
1606                 switch (lov->lo_type) {
1607                 case LLT_RAID0: {
1608                         struct lov_stripe_md *lsm;
1609                         int i;
1610
1611                         lsm = lov->lo_lsm;
1612                         LASSERT(lsm != NULL);
1613                         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1614                                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1615
1616                                 if (lov_oinfo_is_dummy(loi))
1617                                         continue;
1618
1619                                 if (loi->loi_ar.ar_rc && !rc)
1620                                         rc = loi->loi_ar.ar_rc;
1621                                 loi->loi_ar.ar_rc = 0;
1622                         }
1623                 }
1624                 case LLT_RELEASED:
1625                 case LLT_EMPTY:
1626                         break;
1627                 default:
1628                         LBUG();
1629                 }
1630                 lov_conf_thaw(lov);
1631         }
1632         RETURN(rc);
1633 }
1634 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
1635
1636 /** @} lov */