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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * Implementation of cl_object for LOV layer.
  33  *
  34  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  35  *   Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
  36  */
  37
  38 #define DEBUG_SUBSYSTEM S_LOV
  39
  40 #include "lov_cl_internal.h"
  41
  42 static inline struct lov_device *lov_object_dev(struct lov_object *obj)
  43 {
  44         return lu2lov_dev(obj->lo_cl.co_lu.lo_dev);
  45 }
  46
  47 /** \addtogroup lov
  48  *  @{
  49  */
  50
  51 /*****************************************************************************
  52  *
  53  * Layout operations.
  54  *
  55  */
  56
  57 struct lov_layout_operations {
  58         int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
  59                         struct lov_object *lov, struct lov_stripe_md *lsm,
  60                         const struct cl_object_conf *conf,
  61                         union lov_layout_state *state);
  62         int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
  63                            union lov_layout_state *state);
  64         void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
  65                          union lov_layout_state *state);
  66         int  (*llo_print)(const struct lu_env *env, void *cookie,
  67                           lu_printer_t p, const struct lu_object *o);
  68         int  (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
  69                               struct cl_page *page, pgoff_t index);
  70         int  (*llo_lock_init)(const struct lu_env *env,
  71                               struct cl_object *obj, struct cl_lock *lock,
  72                               const struct cl_io *io);
  73         int  (*llo_io_init)(const struct lu_env *env,
  74                             struct cl_object *obj, struct cl_io *io);
  75         int  (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
  76                             struct cl_attr *attr);
  77 };
  78
  79 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
  80
  81 static void lov_lsm_put(struct lov_stripe_md *lsm)
  82 {
  83         if (lsm != NULL)
  84                 lov_free_memmd(&lsm);
  85 }
  86
  87 /*****************************************************************************
  88  *
  89  * Lov object layout operations.
  90  *
  91  */
  92
  93 static struct cl_object *lov_sub_find(const struct lu_env *env,
  94                                       struct cl_device *dev,
  95                                       const struct lu_fid *fid,
  96                                       const struct cl_object_conf *conf)
  97 {
  98         struct lu_object *o;
  99
 100         ENTRY;
 101
 102         o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
 103         LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
 104         RETURN(lu2cl(o));
 105 }
 106
 107 static int lov_page_slice_fixup(struct lov_object *lov,
 108                                 struct cl_object *stripe)
 109 {
 110         struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
 111         struct cl_object *o;
 112
 113         if (stripe == NULL)
 114                 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
 115                        cfs_size_round(sizeof(struct lov_page));
 116
 117         cl_object_for_each(o, stripe)
 118                 o->co_slice_off += hdr->coh_page_bufsize;
 119
 120         return cl_object_header(stripe)->coh_page_bufsize;
 121 }
 122
 123 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
 124                         struct cl_object *subobj, struct lov_oinfo *oinfo,
 125                         int idx)
 126 {
 127         struct cl_object_header *hdr;
 128         struct cl_object_header *subhdr;
 129         struct cl_object_header *parent;
 130         int entry = lov_comp_entry(idx);
 131         int stripe = lov_comp_stripe(idx);
 132         int result;
 133
 134         if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
 135                 /* For sanity:test_206.
 136                  * Do not leave the object in cache to avoid accessing
 137                  * freed memory. This is because osc_object is referring to
 138                  * lov_oinfo of lsm_stripe_data which will be freed due to
 139                  * this failure. */
 140                 cl_object_kill(env, subobj);
 141                 cl_object_put(env, subobj);
 142                 return -EIO;
 143         }
 144
 145         hdr = cl_object_header(lov2cl(lov));
 146         subhdr = cl_object_header(subobj);
 147
 148         CDEBUG(D_INODE, DFID"@%p[%d:%d] -> "DFID"@%p: ostid: "DOSTID
 149                " ost idx: %d gen: %d\n",
 150                PFID(lu_object_fid(&subobj->co_lu)), subhdr, entry, stripe,
 151                PFID(lu_object_fid(lov2lu(lov))), hdr, POSTID(&oinfo->loi_oi),
 152                oinfo->loi_ost_idx, oinfo->loi_ost_gen);
 153
 154         /* reuse ->coh_attr_guard to protect coh_parent change */
 155         spin_lock(&subhdr->coh_attr_guard);
 156         parent = subhdr->coh_parent;
 157         if (parent == NULL) {
 158                 struct lovsub_object *lso = cl2lovsub(subobj);
 159
 160                 subhdr->coh_parent = hdr;
 161                 spin_unlock(&subhdr->coh_attr_guard);
 162                 subhdr->coh_nesting = hdr->coh_nesting + 1;
 163                 lu_object_ref_add(&subobj->co_lu, "lov-parent", lov);
 164                 lso->lso_super = lov;
 165                 lso->lso_index = idx;
 166                 result = 0;
 167         } else {
 168                 struct lu_object  *old_obj;
 169                 struct lov_object *old_lov;
 170                 unsigned int mask = D_INODE;
 171
 172                 spin_unlock(&subhdr->coh_attr_guard);
 173                 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
 174                 LASSERT(old_obj != NULL);
 175                 old_lov = cl2lov(lu2cl(old_obj));
 176                 if (old_lov->lo_layout_invalid) {
 177                         /* the object's layout has already changed but isn't
 178                          * refreshed */
 179                         lu_object_unhash(env, &subobj->co_lu);
 180                         result = -EAGAIN;
 181                 } else {
 182                         mask = D_ERROR;
 183                         result = -EIO;
 184                 }
 185
 186                 LU_OBJECT_DEBUG(mask, env, &subobj->co_lu,
 187                                 "stripe %d is already owned.", idx);
 188                 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.");
 189                 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
 190                 cl_object_put(env, subobj);
 191         }
 192         return result;
 193 }
 194
 195 static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
 196                           struct lov_object *lov, unsigned int index,
 197                           const struct cl_object_conf *conf,
 198                           struct lov_layout_entry *lle)
 199 {
 200         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 201         struct lov_thread_info *lti = lov_env_info(env);
 202         struct cl_object_conf *subconf = &lti->lti_stripe_conf;
 203         struct lu_fid *ofid = &lti->lti_fid;
 204         struct cl_object *stripe;
 205         struct lov_stripe_md_entry *lse  = lov_lse(lov, index);
 206         int result;
 207         int psz, sz;
 208         int i;
 209
 210         ENTRY;
 211
 212         spin_lock_init(&r0->lo_sub_lock);
 213         r0->lo_nr = lse->lsme_stripe_count;
 214         LASSERT(r0->lo_nr <= lov_targets_nr(dev));
 215
 216         OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 217         if (r0->lo_sub == NULL)
 218                 GOTO(out, result = -ENOMEM);
 219
 220         psz = 0;
 221         result = 0;
 222         memset(subconf, 0, sizeof(*subconf));
 223
 224         /*
 225          * Create stripe cl_objects.
 226          */
 227         for (i = 0; i < r0->lo_nr; ++i) {
 228                 struct cl_device *subdev;
 229                 struct lov_oinfo *oinfo = lse->lsme_oinfo[i];
 230                 int ost_idx = oinfo->loi_ost_idx;
 231
 232                 if (lov_oinfo_is_dummy(oinfo))
 233                         continue;
 234
 235                 result = ostid_to_fid(ofid, &oinfo->loi_oi, oinfo->loi_ost_idx);
 236                 if (result != 0)
 237                         GOTO(out, result);
 238
 239                 if (dev->ld_target[ost_idx] == NULL) {
 240                         CERROR("%s: OST %04x is not initialized\n",
 241                                lov2obd(dev->ld_lov)->obd_name, ost_idx);
 242                         GOTO(out, result = -EIO);
 243                 }
 244
 245                 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 246                 subconf->u.coc_oinfo = oinfo;
 247                 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 248                 /* In the function below, .hs_keycmp resolves to
 249                  * lu_obj_hop_keycmp() */
 250                 /* coverity[overrun-buffer-val] */
 251                 stripe = lov_sub_find(env, subdev, ofid, subconf);
 252                 if (IS_ERR(stripe))
 253                         GOTO(out, result = PTR_ERR(stripe));
 254
 255                 result = lov_init_sub(env, lov, stripe, oinfo,
 256                                       lov_comp_index(index, i));
 257                 if (result == -EAGAIN) { /* try again */
 258                         --i;
 259                         result = 0;
 260                         continue;
 261                 }
 262
 263                 if (result == 0) {
 264                         r0->lo_sub[i] = cl2lovsub(stripe);
 265
 266                         sz = lov_page_slice_fixup(lov, stripe);
 267                         LASSERT(ergo(psz > 0, psz == sz));
 268                         psz = sz;
 269                 }
 270         }
 271         if (result == 0)
 272                 result = psz;
 273 out:
 274         RETURN(result);
 275 }
 276
 277 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 278                                struct lov_layout_raid0 *r0,
 279                                struct lovsub_object *los, int idx)
 280 {
 281         struct cl_object        *sub;
 282         struct lu_site          *site;
 283         struct lu_site_bkt_data *bkt;
 284         wait_queue_t          *waiter;
 285
 286         LASSERT(r0->lo_sub[idx] == los);
 287
 288         sub  = lovsub2cl(los);
 289         site = sub->co_lu.lo_dev->ld_site;
 290         bkt  = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
 291
 292         cl_object_kill(env, sub);
 293         /* release a reference to the sub-object and ... */
 294         lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
 295         cl_object_put(env, sub);
 296
 297         /* ... wait until it is actually destroyed---sub-object clears its
 298          * ->lo_sub[] slot in lovsub_object_free() */
 299         if (r0->lo_sub[idx] == los) {
 300                 waiter = &lov_env_info(env)->lti_waiter;
 301                 init_waitqueue_entry(waiter, current);
 302                 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
 303                 set_current_state(TASK_UNINTERRUPTIBLE);
 304                 while (1) {
 305                         /* this wait-queue is signaled at the end of
 306                          * lu_object_free(). */
 307                         set_current_state(TASK_UNINTERRUPTIBLE);
 308                         spin_lock(&r0->lo_sub_lock);
 309                         if (r0->lo_sub[idx] == los) {
 310                                 spin_unlock(&r0->lo_sub_lock);
 311                                 schedule();
 312                         } else {
 313                                 spin_unlock(&r0->lo_sub_lock);
 314                                 set_current_state(TASK_RUNNING);
 315                                 break;
 316                         }
 317                 }
 318                 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
 319         }
 320         LASSERT(r0->lo_sub[idx] == NULL);
 321 }
 322
 323 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 324                              struct lov_layout_entry *lle)
 325 {
 326         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 327
 328         ENTRY;
 329
 330         if (r0->lo_sub != NULL) {
 331                 int i;
 332
 333                 for (i = 0; i < r0->lo_nr; ++i) {
 334                         struct lovsub_object *los = r0->lo_sub[i];
 335
 336                         if (los != NULL) {
 337                                 cl_object_prune(env, &los->lso_cl);
 338                                 /*
 339                                  * If top-level object is to be evicted from
 340                                  * the cache, so are its sub-objects.
 341                                  */
 342                                 lov_subobject_kill(env, lov, r0, los, i);
 343                         }
 344                 }
 345         }
 346
 347         EXIT;
 348 }
 349
 350 static void lov_fini_raid0(const struct lu_env *env,
 351                            struct lov_layout_entry *lle)
 352 {
 353         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 354
 355         if (r0->lo_sub != NULL) {
 356                 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 357                 r0->lo_sub = NULL;
 358         }
 359 }
 360
 361 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 362                            lu_printer_t p, const struct lov_layout_entry *lle)
 363 {
 364         const struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 365         int i;
 366
 367         for (i = 0; i < r0->lo_nr; ++i) {
 368                 struct lu_object *sub;
 369
 370                 if (r0->lo_sub[i] != NULL) {
 371                         sub = lovsub2lu(r0->lo_sub[i]);
 372                         lu_object_print(env, cookie, p, sub);
 373                 } else {
 374                         (*p)(env, cookie, "sub %d absent\n", i);
 375                 }
 376         }
 377         return 0;
 378 }
 379
 380 static int lov_attr_get_raid0(const struct lu_env *env, struct lov_object *lov,
 381                               unsigned int index, struct lov_layout_entry *lle,
 382                               struct cl_attr **lov_attr)
 383 {
 384         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 385         struct lov_stripe_md *lsm = lov->lo_lsm;
 386         struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
 387         struct cl_attr *attr = &r0->lo_attr;
 388         __u64 kms = 0;
 389         int result = 0;
 390
 391         if (r0->lo_attr_valid) {
 392                 *lov_attr = attr;
 393                 return 0;
 394         }
 395
 396         memset(lvb, 0, sizeof(*lvb));
 397
 398         /* XXX: timestamps can be negative by sanity:test_39m,
 399          * how can it be? */
 400         lvb->lvb_atime = LLONG_MIN;
 401         lvb->lvb_ctime = LLONG_MIN;
 402         lvb->lvb_mtime = LLONG_MIN;
 403
 404         /*
 405          * XXX that should be replaced with a loop over sub-objects,
 406          * doing cl_object_attr_get() on them. But for now, let's
 407          * reuse old lov code.
 408          */
 409
 410         /*
 411          * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 412          * happy. It's not needed, because new code uses
 413          * ->coh_attr_guard spin-lock to protect consistency of
 414          * sub-object attributes.
 415          */
 416         lov_stripe_lock(lsm);
 417         result = lov_merge_lvb_kms(lsm, index, lvb, &kms);
 418         lov_stripe_unlock(lsm);
 419         if (result == 0) {
 420                 cl_lvb2attr(attr, lvb);
 421                 attr->cat_kms = kms;
 422                 r0->lo_attr_valid = 1;
 423                 *lov_attr = attr;
 424         }
 425
 426         return result;
 427 }
 428
 429 static struct lov_comp_layout_entry_ops raid0_ops = {
 430         .lco_init      = lov_init_raid0,
 431         .lco_fini      = lov_fini_raid0,
 432         .lco_getattr   = lov_attr_get_raid0,
 433 };
 434
 435 static int lov_attr_get_dom(const struct lu_env *env, struct lov_object *lov,
 436                             unsigned int index, struct lov_layout_entry *lle,
 437                             struct cl_attr **lov_attr)
 438 {
 439         struct lov_layout_dom *dom = &lle->lle_dom;
 440         struct lov_oinfo *loi = dom->lo_loi;
 441         struct cl_attr *attr = &dom->lo_dom_r0.lo_attr;
 442
 443         if (dom->lo_dom_r0.lo_attr_valid) {
 444                 *lov_attr = attr;
 445                 return 0;
 446         }
 447
 448         if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks))
 449                 return OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
 450
 451         cl_lvb2attr(attr, &loi->loi_lvb);
 452
 453         /* DoM component size can be bigger than stripe size after
 454          * client's setattr RPC, so do not count anything beyond
 455          * component end. Alternatively, check that limit on server
 456          * and do not allow size overflow there. */
 457         if (attr->cat_size > lle->lle_extent->e_end)
 458                 attr->cat_size = lle->lle_extent->e_end;
 459
 460         attr->cat_kms = attr->cat_size;
 461
 462         dom->lo_dom_r0.lo_attr_valid = 1;
 463         *lov_attr = attr;
 464
 465         return 0;
 466 }
 467
 468 /**
 469  * Lookup FLD to get MDS index of the given DOM object FID.
 470  *
 471  * \param[in]  ld       LOV device
 472  * \param[in]  fid      FID to lookup
 473  * \param[out] nr       index in MDC array to return back
 474  *
 475  * \retval              0 and \a mds filled with MDS index if successful
 476  * \retval              negative value on error
 477  */
 478 static int lov_fld_lookup(struct lov_device *ld, const struct lu_fid *fid,
 479                           __u32 *nr)
 480 {
 481         __u32 mds_idx;
 482         int i, rc;
 483
 484         ENTRY;
 485
 486         rc = fld_client_lookup(&ld->ld_lmv->u.lmv.lmv_fld, fid_seq(fid),
 487                                &mds_idx, LU_SEQ_RANGE_MDT, NULL);
 488         if (rc) {
 489                 CERROR("%s: error while looking for mds number. Seq %#llx"
 490                        ", err = %d\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 491                        fid_seq(fid), rc);
 492                 RETURN(rc);
 493         }
 494
 495         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
 496                mds_idx, PFID(fid));
 497
 498         /* find proper MDC device in the array */
 499         for (i = 0; i < ld->ld_md_tgts_nr; i++) {
 500                 if (ld->ld_md_tgts[i].ldm_mdc != NULL &&
 501                     ld->ld_md_tgts[i].ldm_idx == mds_idx)
 502                         break;
 503         }
 504
 505         if (i == ld->ld_md_tgts_nr) {
 506                 CERROR("%s: cannot find corresponding MDC device for mds #%x "
 507                        "for fid="DFID"\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 508                        mds_idx, PFID(fid));
 509                 rc = -EINVAL;
 510         } else {
 511                 *nr = i;
 512         }
 513         RETURN(rc);
 514 }
 515
 516 /**
 517  * Implementation of lov_comp_layout_entry_ops::lco_init for DOM object.
 518  *
 519  * Init the DOM object for the first time. It prepares also RAID0 entry
 520  * for it to use in common methods with ordinary RAID0 layout entries.
 521  *
 522  * \param[in] env       execution environment
 523  * \param[in] dev       LOV device
 524  * \param[in] lov       LOV object
 525  * \param[in] index     Composite layout entry index in LSM
 526  * \param[in] lle       Composite LOV layout entry
 527  */
 528 static int lov_init_dom(const struct lu_env *env, struct lov_device *dev,
 529                         struct lov_object *lov, unsigned int index,
 530                         const struct cl_object_conf *conf,
 531                         struct lov_layout_entry *lle)
 532 {
 533         struct lov_thread_info *lti = lov_env_info(env);
 534         struct lov_stripe_md_entry *lsme = lov_lse(lov, index);
 535         struct cl_object *clo;
 536         struct lu_object *o = lov2lu(lov);
 537         const struct lu_fid *fid = lu_object_fid(o);
 538         struct cl_device *mdcdev;
 539         struct lov_oinfo *loi = NULL;
 540         struct cl_object_conf *sconf = &lti->lti_stripe_conf;
 541
 542         int rc;
 543         __u32 idx = 0;
 544
 545         ENTRY;
 546
 547         LASSERT(index == 0);
 548
 549         /* find proper MDS device */
 550         rc = lov_fld_lookup(dev, fid, &idx);
 551         if (rc)
 552                 RETURN(rc);
 553
 554         LASSERTF(dev->ld_md_tgts[idx].ldm_mdc != NULL,
 555                  "LOV md target[%u] is NULL\n", idx);
 556
 557         /* check lsm is DOM, more checks are needed */
 558         LASSERT(lsme->lsme_stripe_count == 0);
 559
 560         /*
 561          * Create lower cl_objects.
 562          */
 563         mdcdev = dev->ld_md_tgts[idx].ldm_mdc;
 564
 565         LASSERTF(mdcdev != NULL, "non-initialized mdc subdev\n");
 566
 567         /* DoM object has no oinfo in LSM entry, create it exclusively */
 568         OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 569         if (loi == NULL)
 570                 RETURN(-ENOMEM);
 571
 572         fid_to_ostid(lu_object_fid(lov2lu(lov)), &loi->loi_oi);
 573
 574         sconf->u.coc_oinfo = loi;
 575 again:
 576         clo = lov_sub_find(env, mdcdev, fid, sconf);
 577         if (IS_ERR(clo))
 578                 GOTO(out, rc = PTR_ERR(clo));
 579
 580         rc = lov_init_sub(env, lov, clo, loi, lov_comp_index(index, 0));
 581         if (rc == -EAGAIN) /* try again */
 582                 goto again;
 583         else if (rc != 0)
 584                 GOTO(out, rc);
 585
 586         lle->lle_dom.lo_dom = cl2lovsub(clo);
 587         spin_lock_init(&lle->lle_dom.lo_dom_r0.lo_sub_lock);
 588         lle->lle_dom.lo_dom_r0.lo_nr = 1;
 589         lle->lle_dom.lo_dom_r0.lo_sub = &lle->lle_dom.lo_dom;
 590         lle->lle_dom.lo_loi = loi;
 591
 592         rc = lov_page_slice_fixup(lov, clo);
 593         RETURN(rc);
 594
 595 out:
 596         if (loi != NULL)
 597                 OBD_SLAB_FREE_PTR(loi, lov_oinfo_slab);
 598         return rc;
 599 }
 600
 601 /**
 602  * Implementation of lov_layout_operations::llo_fini for DOM object.
 603  *
 604  * Finish the DOM object and free related memory.
 605  *
 606  * \param[in] env       execution environment
 607  * \param[in] lov       LOV object
 608  * \param[in] state     LOV layout state
 609  */
 610 static void lov_fini_dom(const struct lu_env *env,
 611                          struct lov_layout_entry *lle)
 612 {
 613         if (lle->lle_dom.lo_dom != NULL)
 614                 lle->lle_dom.lo_dom = NULL;
 615         if (lle->lle_dom.lo_loi != NULL)
 616                 OBD_SLAB_FREE_PTR(lle->lle_dom.lo_loi, lov_oinfo_slab);
 617 }
 618
 619 static struct lov_comp_layout_entry_ops dom_ops = {
 620         .lco_init = lov_init_dom,
 621         .lco_fini = lov_fini_dom,
 622         .lco_getattr = lov_attr_get_dom,
 623 };
 624
 625 static int lov_init_composite(const struct lu_env *env, struct lov_device *dev,
 626                               struct lov_object *lov, struct lov_stripe_md *lsm,
 627                               const struct cl_object_conf *conf,
 628                               union lov_layout_state *state)
 629 {
 630         struct lov_layout_composite *comp = &state->composite;
 631         struct lov_layout_entry *lle;
 632         struct lov_mirror_entry *lre;
 633         unsigned int entry_count;
 634         unsigned int psz = 0;
 635         unsigned int mirror_count;
 636         int flr_state = lsm->lsm_flags & LCM_FL_FLR_MASK;
 637         int result = 0;
 638         int i, j;
 639
 640         ENTRY;
 641
 642         LASSERT(lsm->lsm_entry_count > 0);
 643         LASSERT(lov->lo_lsm == NULL);
 644         lov->lo_lsm = lsm_addref(lsm);
 645         lov->lo_layout_invalid = true;
 646
 647         dump_lsm(D_INODE, lsm);
 648
 649         entry_count = lsm->lsm_entry_count;
 650
 651         spin_lock_init(&comp->lo_write_lock);
 652         comp->lo_flags = lsm->lsm_flags;
 653         comp->lo_mirror_count = lsm->lsm_mirror_count + 1;
 654         comp->lo_entry_count = lsm->lsm_entry_count;
 655         comp->lo_preferred_mirror = -1;
 656
 657         if (equi(flr_state == LCM_FL_NOT_FLR, comp->lo_mirror_count > 1))
 658                 RETURN(-EINVAL);
 659
 660         OBD_ALLOC(comp->lo_mirrors,
 661                   comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 662         if (comp->lo_mirrors == NULL)
 663                 RETURN(-ENOMEM);
 664
 665         OBD_ALLOC(comp->lo_entries, entry_count * sizeof(*comp->lo_entries));
 666         if (comp->lo_entries == NULL)
 667                 RETURN(-ENOMEM);
 668
 669         /* Initiate all entry types and extents data at first */
 670         for (i = 0, j = 0, mirror_count = 1; i < entry_count; i++) {
 671                 int mirror_id = 0;
 672
 673                 lle = &comp->lo_entries[i];
 674
 675                 lle->lle_lsme = lsm->lsm_entries[i];
 676                 lle->lle_type = lov_entry_type(lle->lle_lsme);
 677                 switch (lle->lle_type) {
 678                 case LOV_PATTERN_RAID0:
 679                         lle->lle_comp_ops = &raid0_ops;
 680                         break;
 681                 case LOV_PATTERN_MDT:
 682                         lle->lle_comp_ops = &dom_ops;
 683                         break;
 684                 default:
 685                         CERROR("%s: unknown composite layout entry type %i\n",
 686                                lov2obd(dev->ld_lov)->obd_name,
 687                                lsm->lsm_entries[i]->lsme_pattern);
 688                         dump_lsm(D_ERROR, lsm);
 689                         RETURN(-EIO);
 690                 }
 691
 692                 lle->lle_extent = &lle->lle_lsme->lsme_extent;
 693                 lle->lle_valid = !(lle->lle_lsme->lsme_flags & LCME_FL_STALE);
 694
 695                 if (flr_state != LCM_FL_NOT_FLR)
 696                         mirror_id = mirror_id_of(lle->lle_lsme->lsme_id);
 697
 698                 lre = &comp->lo_mirrors[j];
 699                 if (i > 0) {
 700                         if (mirror_id == lre->lre_mirror_id) {
 701                                 lre->lre_valid |= lle->lle_valid;
 702                                 lre->lre_stale |= !lle->lle_valid;
 703                                 lre->lre_end = i;
 704                                 continue;
 705                         }
 706
 707                         /* new mirror detected, assume that the mirrors
 708                          * are shorted in layout */
 709                         ++mirror_count;
 710                         ++j;
 711                         if (j >= comp->lo_mirror_count)
 712                                 break;
 713
 714                         lre = &comp->lo_mirrors[j];
 715                 }
 716
 717                 /* entries must be sorted by mirrors */
 718                 lre->lre_mirror_id = mirror_id;
 719                 lre->lre_start = lre->lre_end = i;
 720                 lre->lre_preferred = (lle->lle_lsme->lsme_flags &
 721                                         LCME_FL_PREFERRED);
 722                 lre->lre_valid = lle->lle_valid;
 723                 lre->lre_stale = !lle->lle_valid;
 724         }
 725
 726         /* sanity check for FLR */
 727         if (mirror_count != comp->lo_mirror_count) {
 728                 CDEBUG(D_INODE, DFID
 729                        " doesn't have the # of mirrors it claims, %u/%u\n",
 730                        PFID(lu_object_fid(lov2lu(lov))), mirror_count,
 731                        comp->lo_mirror_count + 1);
 732
 733                 GOTO(out, result = -EINVAL);
 734         }
 735
 736         lov_foreach_layout_entry(lov, lle) {
 737                 int index = lov_layout_entry_index(lov, lle);
 738
 739                 /**
 740                  * If the component has not been init-ed on MDS side, for
 741                  * PFL layout, we'd know that the components beyond this one
 742                  * will be dynamically init-ed later on file write/trunc ops.
 743                  */
 744                 if (!lsme_inited(lle->lle_lsme))
 745                         continue;
 746
 747                 result = lle->lle_comp_ops->lco_init(env, dev, lov, index,
 748                                                      conf, lle);
 749                 if (result < 0)
 750                         break;
 751
 752                 LASSERT(ergo(psz > 0, psz == result));
 753                 psz = result;
 754         }
 755
 756         if (psz > 0)
 757                 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
 758
 759         /* decide the preferred mirror */
 760         mirror_count = 0, i = 0;
 761         lov_foreach_mirror_entry(lov, lre) {
 762                 i++;
 763                 if (lre->lre_stale)
 764                         continue;
 765
 766                 mirror_count++; /* valid mirror */
 767
 768                 if (lre->lre_preferred || comp->lo_preferred_mirror < 0)
 769                         comp->lo_preferred_mirror = i - 1;
 770         }
 771         if (mirror_count == 0) {
 772                 CDEBUG(D_INODE, DFID
 773                        " doesn't have any valid mirrors\n",
 774                        PFID(lu_object_fid(lov2lu(lov))));
 775
 776                 GOTO(out, result = -EINVAL);
 777         }
 778
 779         LASSERT(comp->lo_preferred_mirror >= 0);
 780
 781         EXIT;
 782 out:
 783         return result > 0 ? 0 : result;
 784 }
 785
 786 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
 787                           struct lov_object *lov, struct lov_stripe_md *lsm,
 788                           const struct cl_object_conf *conf,
 789                           union lov_layout_state *state)
 790 {
 791         return 0;
 792 }
 793
 794 static int lov_init_released(const struct lu_env *env,
 795                              struct lov_device *dev, struct lov_object *lov,
 796                              struct lov_stripe_md *lsm,
 797                              const struct cl_object_conf *conf,
 798                              union lov_layout_state *state)
 799 {
 800         LASSERT(lsm != NULL);
 801         LASSERT(lsm->lsm_is_released);
 802         LASSERT(lov->lo_lsm == NULL);
 803
 804         lov->lo_lsm = lsm_addref(lsm);
 805         return 0;
 806 }
 807
 808 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 809                             union lov_layout_state *state)
 810 {
 811         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 812
 813         lov_layout_wait(env, lov);
 814         return 0;
 815 }
 816
 817 static int lov_delete_composite(const struct lu_env *env,
 818                                 struct lov_object *lov,
 819                                 union lov_layout_state *state)
 820 {
 821         struct lov_layout_entry *entry;
 822         struct lov_layout_composite *comp = &state->composite;
 823
 824         ENTRY;
 825
 826         dump_lsm(D_INODE, lov->lo_lsm);
 827
 828         lov_layout_wait(env, lov);
 829         if (comp->lo_entries)
 830                 lov_foreach_layout_entry(lov, entry)
 831                         lov_delete_raid0(env, lov, entry);
 832
 833         RETURN(0);
 834 }
 835
 836 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 837                            union lov_layout_state *state)
 838 {
 839         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 840 }
 841
 842 static void lov_fini_composite(const struct lu_env *env,
 843                                struct lov_object *lov,
 844                                union lov_layout_state *state)
 845 {
 846         struct lov_layout_composite *comp = &state->composite;
 847         ENTRY;
 848
 849         if (comp->lo_entries != NULL) {
 850                 struct lov_layout_entry *entry;
 851
 852                 lov_foreach_layout_entry(lov, entry)
 853                         entry->lle_comp_ops->lco_fini(env, entry);
 854
 855                 OBD_FREE(comp->lo_entries,
 856                          comp->lo_entry_count * sizeof(*comp->lo_entries));
 857                 comp->lo_entries = NULL;
 858         }
 859
 860         if (comp->lo_mirrors != NULL) {
 861                 OBD_FREE(comp->lo_mirrors,
 862                          comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 863                 comp->lo_mirrors = NULL;
 864         }
 865
 866         memset(comp, 0, sizeof(*comp));
 867
 868         dump_lsm(D_INODE, lov->lo_lsm);
 869         lov_free_memmd(&lov->lo_lsm);
 870
 871         EXIT;
 872 }
 873
 874 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
 875                                 union lov_layout_state *state)
 876 {
 877         ENTRY;
 878         dump_lsm(D_INODE, lov->lo_lsm);
 879         lov_free_memmd(&lov->lo_lsm);
 880         EXIT;
 881 }
 882
 883 static int lov_print_empty(const struct lu_env *env, void *cookie,
 884                            lu_printer_t p, const struct lu_object *o)
 885 {
 886         (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
 887         return 0;
 888 }
 889
 890 static int lov_print_composite(const struct lu_env *env, void *cookie,
 891                                lu_printer_t p, const struct lu_object *o)
 892 {
 893         struct lov_object *lov = lu2lov(o);
 894         struct lov_stripe_md *lsm = lov->lo_lsm;
 895         int i;
 896
 897         (*p)(env, cookie, "entries: %d, %s, lsm{%p 0x%08X %d %u}:\n",
 898              lsm->lsm_entry_count,
 899              lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 900              lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 901              lsm->lsm_layout_gen);
 902
 903         for (i = 0; i < lsm->lsm_entry_count; i++) {
 904                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 905                 struct lov_layout_entry *lle = lov_entry(lov, i);
 906
 907                 (*p)(env, cookie,
 908                      DEXT ": { 0x%08X, %u, %#x, %u, %#x, %u, %u }\n",
 909                      PEXT(&lse->lsme_extent), lse->lsme_magic,
 910                      lse->lsme_id, lse->lsme_pattern, lse->lsme_layout_gen,
 911                      lse->lsme_flags, lse->lsme_stripe_count,
 912                      lse->lsme_stripe_size);
 913                 lov_print_raid0(env, cookie, p, lle);
 914         }
 915
 916         return 0;
 917 }
 918
 919 static int lov_print_released(const struct lu_env *env, void *cookie,
 920                                 lu_printer_t p, const struct lu_object *o)
 921 {
 922         struct lov_object       *lov = lu2lov(o);
 923         struct lov_stripe_md    *lsm = lov->lo_lsm;
 924
 925         (*p)(env, cookie,
 926                 "released: %s, lsm{%p 0x%08X %d %u}:\n",
 927                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 928                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 929                 lsm->lsm_layout_gen);
 930         return 0;
 931 }
 932
 933 /**
 934  * Implements cl_object_operations::coo_attr_get() method for an object
 935  * without stripes (LLT_EMPTY layout type).
 936  *
 937  * The only attributes this layer is authoritative in this case is
 938  * cl_attr::cat_blocks---it's 0.
 939  */
 940 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 941                               struct cl_attr *attr)
 942 {
 943         attr->cat_blocks = 0;
 944         return 0;
 945 }
 946
 947 static int lov_attr_get_composite(const struct lu_env *env,
 948                                   struct cl_object *obj,
 949                                   struct cl_attr *attr)
 950 {
 951         struct lov_object       *lov = cl2lov(obj);
 952         struct lov_layout_entry *entry;
 953         int                      result = 0;
 954
 955         ENTRY;
 956
 957         attr->cat_size = 0;
 958         attr->cat_blocks = 0;
 959         lov_foreach_layout_entry(lov, entry) {
 960                 struct cl_attr *lov_attr = NULL;
 961                 int index = lov_layout_entry_index(lov, entry);
 962
 963                 if (!entry->lle_valid)
 964                         continue;
 965
 966                 /* PFL: This component has not been init-ed. */
 967                 if (!lsm_entry_inited(lov->lo_lsm, index))
 968                         continue;
 969
 970                 result = entry->lle_comp_ops->lco_getattr(env, lov, index,
 971                                                           entry, &lov_attr);
 972                 if (result < 0)
 973                         RETURN(result);
 974
 975                 if (lov_attr == NULL)
 976                         continue;
 977
 978                 CDEBUG(D_INODE, "COMP ID #%i: s=%llu m=%llu a=%llu c=%llu "
 979                        "b=%llu\n", index - 1, lov_attr->cat_size,
 980                        lov_attr->cat_mtime, lov_attr->cat_atime,
 981                        lov_attr->cat_ctime, lov_attr->cat_blocks);
 982
 983                 /* merge results */
 984                 attr->cat_blocks += lov_attr->cat_blocks;
 985                 if (attr->cat_size < lov_attr->cat_size)
 986                         attr->cat_size = lov_attr->cat_size;
 987                 if (attr->cat_kms < lov_attr->cat_kms)
 988                         attr->cat_kms = lov_attr->cat_kms;
 989                 if (attr->cat_atime < lov_attr->cat_atime)
 990                         attr->cat_atime = lov_attr->cat_atime;
 991                 if (attr->cat_ctime < lov_attr->cat_ctime)
 992                         attr->cat_ctime = lov_attr->cat_ctime;
 993                 if (attr->cat_mtime < lov_attr->cat_mtime)
 994                         attr->cat_mtime = lov_attr->cat_mtime;
 995         }
 996
 997         RETURN(0);
 998 }
 999
1000 const static struct lov_layout_operations lov_dispatch[] = {
1001         [LLT_EMPTY] = {
1002                 .llo_init      = lov_init_empty,
1003                 .llo_delete    = lov_delete_empty,
1004                 .llo_fini      = lov_fini_empty,
1005                 .llo_print     = lov_print_empty,
1006                 .llo_page_init = lov_page_init_empty,
1007                 .llo_lock_init = lov_lock_init_empty,
1008                 .llo_io_init   = lov_io_init_empty,
1009                 .llo_getattr   = lov_attr_get_empty,
1010         },
1011         [LLT_RELEASED] = {
1012                 .llo_init      = lov_init_released,
1013                 .llo_delete    = lov_delete_empty,
1014                 .llo_fini      = lov_fini_released,
1015                 .llo_print     = lov_print_released,
1016                 .llo_page_init = lov_page_init_empty,
1017                 .llo_lock_init = lov_lock_init_empty,
1018                 .llo_io_init   = lov_io_init_released,
1019                 .llo_getattr   = lov_attr_get_empty,
1020         },
1021         [LLT_COMP] = {
1022                 .llo_init      = lov_init_composite,
1023                 .llo_delete    = lov_delete_composite,
1024                 .llo_fini      = lov_fini_composite,
1025                 .llo_print     = lov_print_composite,
1026                 .llo_page_init = lov_page_init_composite,
1027                 .llo_lock_init = lov_lock_init_composite,
1028                 .llo_io_init   = lov_io_init_composite,
1029                 .llo_getattr   = lov_attr_get_composite,
1030         },
1031 };
1032
1033 /**
1034  * Performs a double-dispatch based on the layout type of an object.
1035  */
1036 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)              \
1037 ({                                                      \
1038         struct lov_object *__obj = (obj);               \
1039         enum lov_layout_type __llt;                     \
1040                                                         \
1041         __llt = __obj->lo_type;                         \
1042         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));      \
1043         lov_dispatch[__llt].op(__VA_ARGS__);            \
1044 })
1045
1046 /**
1047  * Return lov_layout_type associated with a given lsm
1048  */
1049 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
1050 {
1051         if (lsm == NULL)
1052                 return LLT_EMPTY;
1053
1054         if (lsm->lsm_is_released)
1055                 return LLT_RELEASED;
1056
1057         if (lsm->lsm_magic == LOV_MAGIC_V1 ||
1058             lsm->lsm_magic == LOV_MAGIC_V3 ||
1059             lsm->lsm_magic == LOV_MAGIC_COMP_V1)
1060                 return LLT_COMP;
1061
1062         return LLT_EMPTY;
1063 }
1064
1065 static inline void lov_conf_freeze(struct lov_object *lov)
1066 {
1067         CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
1068                 lov, lov->lo_owner, current);
1069         if (lov->lo_owner != current)
1070                 down_read(&lov->lo_type_guard);
1071 }
1072
1073 static inline void lov_conf_thaw(struct lov_object *lov)
1074 {
1075         CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
1076                 lov, lov->lo_owner, current);
1077         if (lov->lo_owner != current)
1078                 up_read(&lov->lo_type_guard);
1079 }
1080
1081 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
1082 ({                                                                      \
1083         struct lov_object                      *__obj = (obj);          \
1084         int                                     __lock = !!(lock);      \
1085         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
1086                                                                         \
1087         if (__lock)                                                     \
1088                 lov_conf_freeze(__obj);                                 \
1089         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
1090         if (__lock)                                                     \
1091                 lov_conf_thaw(__obj);                                   \
1092         __result;                                                       \
1093 })
1094
1095 /**
1096  * Performs a locked double-dispatch based on the layout type of an object.
1097  */
1098 #define LOV_2DISPATCH(obj, op, ...)                     \
1099         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
1100
1101 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
1102 do {                                                                    \
1103         struct lov_object                      *__obj = (obj);          \
1104         enum lov_layout_type                    __llt;                  \
1105                                                                         \
1106         lov_conf_freeze(__obj);                                         \
1107         __llt = __obj->lo_type;                                         \
1108         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));                      \
1109         lov_dispatch[__llt].op(__VA_ARGS__);                            \
1110         lov_conf_thaw(__obj);                                           \
1111 } while (0)
1112
1113 static void lov_conf_lock(struct lov_object *lov)
1114 {
1115         LASSERT(lov->lo_owner != current);
1116         down_write(&lov->lo_type_guard);
1117         LASSERT(lov->lo_owner == NULL);
1118         lov->lo_owner = current;
1119         CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
1120                 lov, lov->lo_owner);
1121 }
1122
1123 static void lov_conf_unlock(struct lov_object *lov)
1124 {
1125         CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
1126                 lov, lov->lo_owner);
1127         lov->lo_owner = NULL;
1128         up_write(&lov->lo_type_guard);
1129 }
1130
1131 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
1132 {
1133         struct l_wait_info lwi = { 0 };
1134         ENTRY;
1135
1136         while (atomic_read(&lov->lo_active_ios) > 0) {
1137                 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
1138                         PFID(lu_object_fid(lov2lu(lov))),
1139                         atomic_read(&lov->lo_active_ios));
1140
1141                 l_wait_event(lov->lo_waitq,
1142                              atomic_read(&lov->lo_active_ios) == 0, &lwi);
1143         }
1144         RETURN(0);
1145 }
1146
1147 static int lov_layout_change(const struct lu_env *unused,
1148                              struct lov_object *lov, struct lov_stripe_md *lsm,
1149                              const struct cl_object_conf *conf)
1150 {
1151         enum lov_layout_type llt = lov_type(lsm);
1152         union lov_layout_state *state = &lov->u;
1153         const struct lov_layout_operations *old_ops;
1154         const struct lov_layout_operations *new_ops;
1155         struct lov_device *lov_dev = lov_object_dev(lov);
1156         struct lu_env *env;
1157         __u16 refcheck;
1158         int rc;
1159         ENTRY;
1160
1161         LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch));
1162
1163         env = cl_env_get(&refcheck);
1164         if (IS_ERR(env))
1165                 RETURN(PTR_ERR(env));
1166
1167         LASSERT(llt < ARRAY_SIZE(lov_dispatch));
1168
1169         CDEBUG(D_INODE, DFID" from %s to %s\n",
1170                PFID(lu_object_fid(lov2lu(lov))),
1171                llt2str(lov->lo_type), llt2str(llt));
1172
1173         old_ops = &lov_dispatch[lov->lo_type];
1174         new_ops = &lov_dispatch[llt];
1175
1176         rc = cl_object_prune(env, &lov->lo_cl);
1177         if (rc != 0)
1178                 GOTO(out, rc);
1179
1180         rc = old_ops->llo_delete(env, lov, &lov->u);
1181         if (rc != 0)
1182                 GOTO(out, rc);
1183
1184         old_ops->llo_fini(env, lov, &lov->u);
1185
1186         LASSERT(atomic_read(&lov->lo_active_ios) == 0);
1187
1188         CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
1189                PFID(lu_object_fid(lov2lu(lov))), lov, llt);
1190
1191         /* page bufsize fixup */
1192         cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
1193                 lov_page_slice_fixup(lov, NULL);
1194
1195         lov->lo_type = llt;
1196         rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
1197         if (rc != 0) {
1198                 struct obd_device *obd = lov2obd(lov_dev->ld_lov);
1199
1200                 CERROR("%s: cannot apply new layout on "DFID" : rc = %d\n",
1201                        obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
1202                 new_ops->llo_delete(env, lov, state);
1203                 new_ops->llo_fini(env, lov, state);
1204                 /* this file becomes an EMPTY file. */
1205                 lov->lo_type = LLT_EMPTY;
1206                 GOTO(out, rc);
1207         }
1208
1209 out:
1210         cl_env_put(env, &refcheck);
1211         RETURN(rc);
1212 }
1213
1214 /*****************************************************************************
1215  *
1216  * Lov object operations.
1217  *
1218  */
1219 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
1220                     const struct lu_object_conf *conf)
1221 {
1222         struct lov_object            *lov   = lu2lov(obj);
1223         struct lov_device            *dev   = lov_object_dev(lov);
1224         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
1225         union lov_layout_state       *set   = &lov->u;
1226         const struct lov_layout_operations *ops;
1227         struct lov_stripe_md *lsm = NULL;
1228         int rc;
1229         ENTRY;
1230
1231         init_rwsem(&lov->lo_type_guard);
1232         atomic_set(&lov->lo_active_ios, 0);
1233         init_waitqueue_head(&lov->lo_waitq);
1234         cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
1235
1236         lov->lo_type = LLT_EMPTY;
1237         if (cconf->u.coc_layout.lb_buf != NULL) {
1238                 lsm = lov_unpackmd(dev->ld_lov,
1239                                    cconf->u.coc_layout.lb_buf,
1240                                    cconf->u.coc_layout.lb_len);
1241                 if (IS_ERR(lsm))
1242                         RETURN(PTR_ERR(lsm));
1243
1244                 dump_lsm(D_INODE, lsm);
1245         }
1246
1247         /* no locking is necessary, as object is being created */
1248         lov->lo_type = lov_type(lsm);
1249         ops = &lov_dispatch[lov->lo_type];
1250         rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
1251         if (rc != 0)
1252                 GOTO(out_lsm, rc);
1253
1254 out_lsm:
1255         lov_lsm_put(lsm);
1256
1257         RETURN(rc);
1258 }
1259
1260 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
1261                         const struct cl_object_conf *conf)
1262 {
1263         struct lov_stripe_md    *lsm = NULL;
1264         struct lov_object       *lov = cl2lov(obj);
1265         int                      result = 0;
1266         ENTRY;
1267
1268         if (conf->coc_opc == OBJECT_CONF_SET &&
1269             conf->u.coc_layout.lb_buf != NULL) {
1270                 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
1271                                    conf->u.coc_layout.lb_buf,
1272                                    conf->u.coc_layout.lb_len);
1273                 if (IS_ERR(lsm))
1274                         RETURN(PTR_ERR(lsm));
1275                 dump_lsm(D_INODE, lsm);
1276         }
1277
1278         lov_conf_lock(lov);
1279         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
1280                 lov->lo_layout_invalid = true;
1281                 GOTO(out, result = 0);
1282         }
1283
1284         if (conf->coc_opc == OBJECT_CONF_WAIT) {
1285                 if (lov->lo_layout_invalid &&
1286                     atomic_read(&lov->lo_active_ios) > 0) {
1287                         lov_conf_unlock(lov);
1288                         result = lov_layout_wait(env, lov);
1289                         lov_conf_lock(lov);
1290                 }
1291                 GOTO(out, result);
1292         }
1293
1294         LASSERT(conf->coc_opc == OBJECT_CONF_SET);
1295
1296         if ((lsm == NULL && lov->lo_lsm == NULL) ||
1297             ((lsm != NULL && lov->lo_lsm != NULL) &&
1298              (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
1299              (lov->lo_lsm->lsm_entries[0]->lsme_pattern ==
1300               lsm->lsm_entries[0]->lsme_pattern))) {
1301                 /* same version of layout */
1302                 lov->lo_layout_invalid = false;
1303                 GOTO(out, result = 0);
1304         }
1305
1306         /* will change layout - check if there still exists active IO. */
1307         if (atomic_read(&lov->lo_active_ios) > 0) {
1308                 lov->lo_layout_invalid = true;
1309                 GOTO(out, result = -EBUSY);
1310         }
1311
1312         result = lov_layout_change(env, lov, lsm, conf);
1313         lov->lo_layout_invalid = result != 0;
1314         EXIT;
1315
1316 out:
1317         lov_conf_unlock(lov);
1318         lov_lsm_put(lsm);
1319         CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
1320                PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
1321         RETURN(result);
1322 }
1323
1324 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
1325 {
1326         struct lov_object *lov = lu2lov(obj);
1327
1328         ENTRY;
1329         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
1330         EXIT;
1331 }
1332
1333 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
1334 {
1335         struct lov_object *lov = lu2lov(obj);
1336
1337         ENTRY;
1338         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
1339         lu_object_fini(obj);
1340         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
1341         EXIT;
1342 }
1343
1344 static int lov_object_print(const struct lu_env *env, void *cookie,
1345                             lu_printer_t p, const struct lu_object *o)
1346 {
1347         return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
1348 }
1349
1350 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
1351                   struct cl_page *page, pgoff_t index)
1352 {
1353         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
1354                                     index);
1355 }
1356
1357 /**
1358  * Implements cl_object_operations::clo_io_init() method for lov
1359  * layer. Dispatches to the appropriate layout io initialization method.
1360  */
1361 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
1362                 struct cl_io *io)
1363 {
1364         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_preserved);
1365
1366         CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
1367                PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
1368                io->ci_ignore_layout, io->ci_verify_layout);
1369
1370         /* IO type CIT_MISC with ci_ignore_layout set are usually invoked from
1371          * the OSC layer. It shouldn't take lov layout conf lock in that case,
1372          * because as long as the OSC object exists, the layout can't be
1373          * reconfigured. */
1374         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
1375                         !(io->ci_ignore_layout && io->ci_type == CIT_MISC),
1376                         env, obj, io);
1377 }
1378
1379 /**
1380  * An implementation of cl_object_operations::clo_attr_get() method for lov
1381  * layer. For raid0 layout this collects and merges attributes of all
1382  * sub-objects.
1383  */
1384 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
1385                         struct cl_attr *attr)
1386 {
1387         /* do not take lock, as this function is called under a
1388          * spin-lock. Layout is protected from changing by ongoing IO. */
1389         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
1390 }
1391
1392 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1393                            const struct cl_attr *attr, unsigned valid)
1394 {
1395         /*
1396          * No dispatch is required here, as no layout implements this.
1397          */
1398         return 0;
1399 }
1400
1401 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1402                   struct cl_lock *lock, const struct cl_io *io)
1403 {
1404         /* No need to lock because we've taken one refcount of layout.  */
1405         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1406                                     io);
1407 }
1408
1409 /**
1410  * We calculate on which OST the mapping will end. If the length of mapping
1411  * is greater than (stripe_size * stripe_count) then the last_stripe will
1412  * will be one just before start_stripe. Else we check if the mapping
1413  * intersects each OST and find last_stripe.
1414  * This function returns the last_stripe and also sets the stripe_count
1415  * over which the mapping is spread
1416  *
1417  * \param lsm [in]              striping information for the file
1418  * \param index [in]            stripe component index
1419  * \param ext [in]              logical extent of mapping
1420  * \param start_stripe [in]     starting stripe of the mapping
1421  * \param stripe_count [out]    the number of stripes across which to map is
1422  *                              returned
1423  *
1424  * \retval last_stripe          return the last stripe of the mapping
1425  */
1426 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, int index,
1427                                    struct lu_extent *ext,
1428                                    int start_stripe, int *stripe_count)
1429 {
1430         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1431         int last_stripe;
1432         u64 obd_start;
1433         u64 obd_end;
1434         int i, j;
1435
1436         if (ext->e_end - ext->e_start >
1437             lsme->lsme_stripe_size * lsme->lsme_stripe_count) {
1438                 last_stripe = (start_stripe < 1 ? lsme->lsme_stripe_count - 1 :
1439                                                   start_stripe - 1);
1440                 *stripe_count = lsme->lsme_stripe_count;
1441         } else {
1442                 for (j = 0, i = start_stripe; j < lsme->lsme_stripe_count;
1443                      i = (i + 1) % lsme->lsme_stripe_count, j++) {
1444                         if ((lov_stripe_intersects(lsm, index,  i, ext,
1445                                                    &obd_start, &obd_end)) == 0)
1446                                 break;
1447                 }
1448                 *stripe_count = j;
1449                 last_stripe = (start_stripe + j - 1) % lsme->lsme_stripe_count;
1450         }
1451
1452         return last_stripe;
1453 }
1454
1455 /**
1456  * Set fe_device and copy extents from local buffer into main return buffer.
1457  *
1458  * \param fiemap [out]          fiemap to hold all extents
1459  * \param lcl_fm_ext [in]       array of fiemap extents get from OSC layer
1460  * \param ost_index [in]        OST index to be written into the fm_device
1461  *                              field for each extent
1462  * \param ext_count [in]        number of extents to be copied
1463  * \param current_extent [in]   where to start copying in the extent array
1464  */
1465 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1466                                          struct fiemap_extent *lcl_fm_ext,
1467                                          int ost_index, unsigned int ext_count,
1468                                          int current_extent)
1469 {
1470         char            *to;
1471         unsigned int    ext;
1472
1473         for (ext = 0; ext < ext_count; ext++) {
1474                 lcl_fm_ext[ext].fe_device = ost_index;
1475                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1476         }
1477
1478         /* Copy fm_extent's from fm_local to return buffer */
1479         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1480         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1481 }
1482
1483 #define FIEMAP_BUFFER_SIZE 4096
1484
1485 /**
1486  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1487  * call. The local end offset and the device are sent in the first
1488  * fm_extent. This function calculates the stripe number from the index.
1489  * This function returns a stripe_no on which mapping is to be restarted.
1490  *
1491  * This function returns fm_end_offset which is the in-OST offset at which
1492  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1493  * will re-calculate proper offset in next stripe.
1494  * Note that the first extent is passed to lov_get_info via the value field.
1495  *
1496  * \param fiemap [in]           fiemap request header
1497  * \param lsm [in]              striping information for the file
1498  * \param index [in]            stripe component index
1499  * \param ext [in]              logical extent of mapping
1500  * \param start_stripe [out]    starting stripe will be returned in this
1501  */
1502 static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1503                                      struct lov_stripe_md *lsm,
1504                                      int index, struct lu_extent *ext,
1505                                      int *start_stripe)
1506 {
1507         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1508         u64 local_end = fiemap->fm_extents[0].fe_logical;
1509         u64 lun_start;
1510         u64 lun_end;
1511         u64 fm_end_offset;
1512         int stripe_no = -1;
1513         int i;
1514
1515         if (fiemap->fm_extent_count == 0 ||
1516             fiemap->fm_extents[0].fe_logical == 0)
1517                 return 0;
1518
1519         /* Find out stripe_no from ost_index saved in the fe_device */
1520         for (i = 0; i < lsme->lsme_stripe_count; i++) {
1521                 struct lov_oinfo *oinfo = lsme->lsme_oinfo[i];
1522
1523                 if (lov_oinfo_is_dummy(oinfo))
1524                         continue;
1525
1526                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1527                         stripe_no = i;
1528                         break;
1529                 }
1530         }
1531
1532         if (stripe_no == -1)
1533                 return -EINVAL;
1534
1535         /* If we have finished mapping on previous device, shift logical
1536          * offset to start of next device */
1537         if (lov_stripe_intersects(lsm, index, stripe_no, ext,
1538                                    &lun_start, &lun_end) != 0 &&
1539             local_end < lun_end) {
1540                 fm_end_offset = local_end;
1541                 *start_stripe = stripe_no;
1542         } else {
1543                 /* This is a special value to indicate that caller should
1544                  * calculate offset in next stripe. */
1545                 fm_end_offset = 0;
1546                 *start_stripe = (stripe_no + 1) % lsme->lsme_stripe_count;
1547         }
1548
1549         return fm_end_offset;
1550 }
1551
1552 struct fiemap_state {
1553         struct fiemap           *fs_fm;
1554         struct lu_extent        fs_ext;
1555         u64                     fs_length;
1556         u64                     fs_end_offset;
1557         int                     fs_cur_extent;
1558         int                     fs_cnt_need;
1559         int                     fs_start_stripe;
1560         int                     fs_last_stripe;
1561         bool                    fs_device_done;
1562         bool                    fs_finish_stripe;
1563         bool                    fs_enough;
1564 };
1565
1566 static struct cl_object *lov_find_subobj(const struct lu_env *env,
1567                                          struct lov_object *lov,
1568                                          struct lov_stripe_md *lsm,
1569                                          int index)
1570 {
1571         struct lov_device       *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
1572         struct lov_thread_info  *lti = lov_env_info(env);
1573         struct lu_fid           *ofid = &lti->lti_fid;
1574         struct lov_oinfo        *oinfo;
1575         struct cl_device        *subdev;
1576         int                     entry = lov_comp_entry(index);
1577         int                     stripe = lov_comp_stripe(index);
1578         int                     ost_idx;
1579         int                     rc;
1580         struct cl_object        *result;
1581
1582         if (lov->lo_type != LLT_COMP)
1583                 GOTO(out, result = NULL);
1584
1585         if (entry >= lsm->lsm_entry_count ||
1586             stripe >= lsm->lsm_entries[entry]->lsme_stripe_count)
1587                 GOTO(out, result = NULL);
1588
1589         oinfo = lsm->lsm_entries[entry]->lsme_oinfo[stripe];
1590         ost_idx = oinfo->loi_ost_idx;
1591         rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
1592         if (rc != 0)
1593                 GOTO(out, result = NULL);
1594
1595         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
1596         result = lov_sub_find(env, subdev, ofid, NULL);
1597 out:
1598         if (result == NULL)
1599                 result = ERR_PTR(-EINVAL);
1600         return result;
1601 }
1602
1603 int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj,
1604                       struct lov_stripe_md *lsm, struct fiemap *fiemap,
1605                       size_t *buflen, struct ll_fiemap_info_key *fmkey,
1606                       int index, int stripeno, struct fiemap_state *fs)
1607 {
1608         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1609         struct cl_object *subobj;
1610         struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1611         struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0];
1612         u64 req_fm_len; /* Stores length of required mapping */
1613         u64 len_mapped_single_call;
1614         u64 lun_start;
1615         u64 lun_end;
1616         u64 obd_object_end;
1617         unsigned int ext_count;
1618         /* EOF for object */
1619         bool ost_eof = false;
1620         /* done with required mapping for this OST? */
1621         bool ost_done = false;
1622         int ost_index;
1623         int rc = 0;
1624
1625         fs->fs_device_done = false;
1626         /* Find out range of mapping on this stripe */
1627         if ((lov_stripe_intersects(lsm, index, stripeno, &fs->fs_ext,
1628                                    &lun_start, &obd_object_end)) == 0)
1629                 return 0;
1630
1631         if (lov_oinfo_is_dummy(lsme->lsme_oinfo[stripeno]))
1632                 return -EIO;
1633
1634         /* If this is a continuation FIEMAP call and we are on
1635          * starting stripe then lun_start needs to be set to
1636          * end_offset */
1637         if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe)
1638                 lun_start = fs->fs_end_offset;
1639         lun_end = lov_size_to_stripe(lsm, index, fs->fs_ext.e_end, stripeno);
1640         if (lun_start == lun_end)
1641                 return 0;
1642
1643         req_fm_len = obd_object_end - lun_start;
1644         fs->fs_fm->fm_length = 0;
1645         len_mapped_single_call = 0;
1646
1647         /* find lobsub object */
1648         subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1649                                  lov_comp_index(index, stripeno));
1650         if (IS_ERR(subobj))
1651                 return PTR_ERR(subobj);
1652         /* If the output buffer is very large and the objects have many
1653          * extents we may need to loop on a single OST repeatedly */
1654         do {
1655                 if (fiemap->fm_extent_count > 0) {
1656                         /* Don't get too many extents. */
1657                         if (fs->fs_cur_extent + fs->fs_cnt_need >
1658                             fiemap->fm_extent_count)
1659                                 fs->fs_cnt_need = fiemap->fm_extent_count -
1660                                                   fs->fs_cur_extent;
1661                 }
1662
1663                 lun_start += len_mapped_single_call;
1664                 fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call;
1665                 req_fm_len = fs->fs_fm->fm_length;
1666                 /**
1667                  * If we've collected enough extent map, we'd request 1 more,
1668                  * to see whether we coincidentally finished all available
1669                  * extent map, so that FIEMAP_EXTENT_LAST would be set.
1670                  */
1671                 fs->fs_fm->fm_extent_count = fs->fs_enough ?
1672                                              1 : fs->fs_cnt_need;
1673                 fs->fs_fm->fm_mapped_extents = 0;
1674                 fs->fs_fm->fm_flags = fiemap->fm_flags;
1675
1676                 ost_index = lsme->lsme_oinfo[stripeno]->loi_ost_idx;
1677
1678                 if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count)
1679                         GOTO(obj_put, rc = -EINVAL);
1680                 /* If OST is inactive, return extent with UNKNOWN flag. */
1681                 if (!lov->lov_tgts[ost_index]->ltd_active) {
1682                         fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST;
1683                         fs->fs_fm->fm_mapped_extents = 1;
1684
1685                         fm_ext[0].fe_logical = lun_start;
1686                         fm_ext[0].fe_length = obd_object_end - lun_start;
1687                         fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1688
1689                         goto inactive_tgt;
1690                 }
1691
1692                 fs->fs_fm->fm_start = lun_start;
1693                 fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1694                 memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm));
1695                 *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count);
1696
1697                 rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen);
1698                 if (rc != 0)
1699                         GOTO(obj_put, rc);
1700 inactive_tgt:
1701                 ext_count = fs->fs_fm->fm_mapped_extents;
1702                 if (ext_count == 0) {
1703                         ost_done = true;
1704                         fs->fs_device_done = true;
1705                         /* If last stripe has hold at the end,
1706                          * we need to return */
1707                         if (stripeno == fs->fs_last_stripe) {
1708                                 fiemap->fm_mapped_extents = 0;
1709                                 fs->fs_finish_stripe = true;
1710                                 GOTO(obj_put, rc);
1711                         }
1712                         break;
1713                 } else if (fs->fs_enough) {
1714                         /*
1715                          * We've collected enough extents and there are
1716                          * more extents after it.
1717                          */
1718                         GOTO(obj_put, rc);
1719                 }
1720
1721                 /* If we just need num of extents, got to next device */
1722                 if (fiemap->fm_extent_count == 0) {
1723                         fs->fs_cur_extent += ext_count;
1724                         break;
1725                 }
1726
1727                 /* prepare to copy retrived map extents */
1728                 len_mapped_single_call = fm_ext[ext_count - 1].fe_logical +
1729                                          fm_ext[ext_count - 1].fe_length -
1730                                          lun_start;
1731
1732                 /* Have we finished mapping on this device? */
1733                 if (req_fm_len <= len_mapped_single_call) {
1734                         ost_done = true;
1735                         fs->fs_device_done = true;
1736                 }
1737
1738                 /* Clear the EXTENT_LAST flag which can be present on
1739                  * the last extent */
1740                 if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST)
1741                         fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST;
1742                 if (lov_stripe_size(lsm, index,
1743                                     fm_ext[ext_count - 1].fe_logical +
1744                                     fm_ext[ext_count - 1].fe_length,
1745                                     stripeno) >= fmkey->lfik_oa.o_size) {
1746                         ost_eof = true;
1747                         fs->fs_device_done = true;
1748                 }
1749
1750                 fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index,
1751                                              ext_count, fs->fs_cur_extent);
1752                 fs->fs_cur_extent += ext_count;
1753
1754                 /* Ran out of available extents? */
1755                 if (fs->fs_cur_extent >= fiemap->fm_extent_count)
1756                         fs->fs_enough = true;
1757         } while (!ost_done && !ost_eof);
1758
1759         if (stripeno == fs->fs_last_stripe)
1760                 fs->fs_finish_stripe = true;
1761 obj_put:
1762         cl_object_put(env, subobj);
1763
1764         return rc;
1765 }
1766
1767 /**
1768  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1769  * This also handles the restarting of FIEMAP calls in case mapping overflows
1770  * the available number of extents in single call.
1771  *
1772  * \param env [in]              lustre environment
1773  * \param obj [in]              file object
1774  * \param fmkey [in]            fiemap request header and other info
1775  * \param fiemap [out]          fiemap buffer holding retrived map extents
1776  * \param buflen [in/out]       max buffer length of @fiemap, when iterate
1777  *                              each OST, it is used to limit max map needed
1778  * \retval 0    success
1779  * \retval < 0  error
1780  */
1781 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1782                              struct ll_fiemap_info_key *fmkey,
1783                              struct fiemap *fiemap, size_t *buflen)
1784 {
1785         struct lov_stripe_md_entry *lsme;
1786         struct lov_stripe_md *lsm;
1787         struct fiemap *fm_local = NULL;
1788         loff_t whole_start;
1789         loff_t whole_end;
1790         int entry;
1791         int start_entry;
1792         int end_entry;
1793         int cur_stripe = 0;
1794         int stripe_count;
1795         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1796         int rc = 0;
1797         struct fiemap_state fs = { 0 };
1798         ENTRY;
1799
1800         lsm = lov_lsm_addref(cl2lov(obj));
1801         if (lsm == NULL)
1802                 RETURN(-ENODATA);
1803
1804         if (!(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
1805                 /**
1806                  * If the entry count > 1 or stripe_count > 1 and the
1807                  * application does not understand DEVICE_ORDER flag,
1808                  * it cannot interpret the extents correctly.
1809                  */
1810                 if (lsm->lsm_entry_count > 1 ||
1811                     (lsm->lsm_entry_count == 1 &&
1812                      lsm->lsm_entries[0]->lsme_stripe_count > 1))
1813                         GOTO(out_lsm, rc = -ENOTSUPP);
1814         }
1815
1816         /* No support for DOM layout yet. */
1817         if (lsme_is_dom(lsm->lsm_entries[0]))
1818                 GOTO(out_lsm, rc = -ENOTSUPP);
1819
1820         if (lsm->lsm_is_released) {
1821                 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1822                         /**
1823                          * released file, return a minimal FIEMAP if
1824                          * request fits in file-size.
1825                          */
1826                         fiemap->fm_mapped_extents = 1;
1827                         fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1828                         if (fiemap->fm_start + fiemap->fm_length <
1829                             fmkey->lfik_oa.o_size)
1830                                 fiemap->fm_extents[0].fe_length =
1831                                         fiemap->fm_length;
1832                         else
1833                                 fiemap->fm_extents[0].fe_length =
1834                                         fmkey->lfik_oa.o_size -
1835                                         fiemap->fm_start;
1836                         fiemap->fm_extents[0].fe_flags |=
1837                                 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1838                 }
1839                 GOTO(out_lsm, rc = 0);
1840         }
1841
1842         /* buffer_size is small to hold fm_extent_count of extents. */
1843         if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1844                 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1845
1846         OBD_ALLOC_LARGE(fm_local, buffer_size);
1847         if (fm_local == NULL)
1848                 GOTO(out_lsm, rc = -ENOMEM);
1849
1850         /**
1851          * Requested extent count exceeds the fiemap buffer size, shrink our
1852          * ambition.
1853          */
1854         if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1855                 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1856         if (fiemap->fm_extent_count == 0)
1857                 fs.fs_cnt_need = 0;
1858
1859         fs.fs_enough = false;
1860         fs.fs_cur_extent = 0;
1861         fs.fs_fm = fm_local;
1862         fs.fs_cnt_need = fiemap_size_to_count(buffer_size);
1863
1864         whole_start = fiemap->fm_start;
1865         /* whole_start is beyond the end of the file */
1866         if (whole_start > fmkey->lfik_oa.o_size)
1867                 GOTO(out_fm_local, rc = -EINVAL);
1868         whole_end = (fiemap->fm_length == OBD_OBJECT_EOF) ?
1869                                         fmkey->lfik_oa.o_size :
1870                                         whole_start + fiemap->fm_length - 1;
1871         /**
1872          * If fiemap->fm_length != OBD_OBJECT_EOF but whole_end exceeds file
1873          * size
1874          */
1875         if (whole_end > fmkey->lfik_oa.o_size)
1876                 whole_end = fmkey->lfik_oa.o_size;
1877
1878         start_entry = lov_lsm_entry(lsm, whole_start);
1879         end_entry = lov_lsm_entry(lsm, whole_end);
1880         if (end_entry == -1)
1881                 end_entry = lsm->lsm_entry_count - 1;
1882
1883         if (start_entry == -1 || end_entry == -1)
1884                 GOTO(out_fm_local, rc = -EINVAL);
1885
1886         /* TODO: rewrite it with lov_foreach_io_layout() */
1887         for (entry = start_entry; entry <= end_entry; entry++) {
1888                 lsme = lsm->lsm_entries[entry];
1889
1890                 if (!lsme_inited(lsme))
1891                         break;
1892
1893                 if (entry == start_entry)
1894                         fs.fs_ext.e_start = whole_start;
1895                 else
1896                         fs.fs_ext.e_start = lsme->lsme_extent.e_start;
1897                 if (entry == end_entry)
1898                         fs.fs_ext.e_end = whole_end;
1899                 else
1900                         fs.fs_ext.e_end = lsme->lsme_extent.e_end - 1;
1901                 fs.fs_length = fs.fs_ext.e_end - fs.fs_ext.e_start + 1;
1902
1903                 /* Calculate start stripe, last stripe and length of mapping */
1904                 fs.fs_start_stripe = lov_stripe_number(lsm, entry,
1905                                                        fs.fs_ext.e_start);
1906                 fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, entry,
1907                                         &fs.fs_ext, fs.fs_start_stripe,
1908                                         &stripe_count);
1909                 fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, entry,
1910                                         &fs.fs_ext, &fs.fs_start_stripe);
1911                 /* Check each stripe */
1912                 for (cur_stripe = fs.fs_start_stripe; stripe_count > 0;
1913                      --stripe_count,
1914                      cur_stripe = (cur_stripe + 1) % lsme->lsme_stripe_count) {
1915                         rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen,
1916                                                fmkey, entry, cur_stripe, &fs);
1917                         if (rc < 0)
1918                                 GOTO(out_fm_local, rc);
1919                         if (fs.fs_enough)
1920                                 GOTO(finish, rc);
1921                         if (fs.fs_finish_stripe)
1922                                 break;
1923                 } /* for each stripe */
1924         } /* for covering layout component */
1925         /*
1926          * We've traversed all components, set @entry to the last component
1927          * entry, it's for the last stripe check.
1928          */
1929         entry--;
1930 finish:
1931         /* Indicate that we are returning device offsets unless file just has
1932          * single stripe */
1933         if (lsm->lsm_entry_count > 1 ||
1934             (lsm->lsm_entry_count == 1 &&
1935              lsm->lsm_entries[0]->lsme_stripe_count > 1))
1936                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1937
1938         if (fiemap->fm_extent_count == 0)
1939                 goto skip_last_device_calc;
1940
1941         /* Check if we have reached the last stripe and whether mapping for that
1942          * stripe is done. */
1943         if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done)
1944                 fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |=
1945                                                              FIEMAP_EXTENT_LAST;
1946 skip_last_device_calc:
1947         fiemap->fm_mapped_extents = fs.fs_cur_extent;
1948 out_fm_local:
1949         OBD_FREE_LARGE(fm_local, buffer_size);
1950
1951 out_lsm:
1952         lov_lsm_put(lsm);
1953         return rc;
1954 }
1955
1956 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
1957                                 struct lov_user_md __user *lum, size_t size)
1958 {
1959         struct lov_object       *lov = cl2lov(obj);
1960         struct lov_stripe_md    *lsm;
1961         int                     rc = 0;
1962         ENTRY;
1963
1964         lsm = lov_lsm_addref(lov);
1965         if (lsm == NULL)
1966                 RETURN(-ENODATA);
1967
1968         rc = lov_getstripe(env, cl2lov(obj), lsm, lum, size);
1969         lov_lsm_put(lsm);
1970         RETURN(rc);
1971 }
1972
1973 static int lov_object_layout_get(const struct lu_env *env,
1974                                  struct cl_object *obj,
1975                                  struct cl_layout *cl)
1976 {
1977         struct lov_object *lov = cl2lov(obj);
1978         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
1979         struct lu_buf *buf = &cl->cl_buf;
1980         ssize_t rc;
1981         ENTRY;
1982
1983         if (lsm == NULL) {
1984                 cl->cl_size = 0;
1985                 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
1986
1987                 RETURN(0);
1988         }
1989
1990         cl->cl_size = lov_comp_md_size(lsm);
1991         cl->cl_layout_gen = lsm->lsm_layout_gen;
1992         cl->cl_dom_comp_size = 0;
1993         if (lsm_is_composite(lsm->lsm_magic)) {
1994                 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[0];
1995
1996                 cl->cl_is_composite = true;
1997
1998                 if (lsme_is_dom(lsme))
1999                         cl->cl_dom_comp_size = lsme->lsme_extent.e_end;
2000         } else {
2001                 cl->cl_is_composite = false;
2002         }
2003
2004         rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
2005         lov_lsm_put(lsm);
2006
2007         RETURN(rc < 0 ? rc : 0);
2008 }
2009
2010 static loff_t lov_object_maxbytes(struct cl_object *obj)
2011 {
2012         struct lov_object *lov = cl2lov(obj);
2013         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2014         loff_t maxbytes;
2015
2016         if (lsm == NULL)
2017                 return LLONG_MAX;
2018
2019         maxbytes = lsm->lsm_maxbytes;
2020
2021         lov_lsm_put(lsm);
2022
2023         return maxbytes;
2024 }
2025
2026 static const struct cl_object_operations lov_ops = {
2027         .coo_page_init    = lov_page_init,
2028         .coo_lock_init    = lov_lock_init,
2029         .coo_io_init      = lov_io_init,
2030         .coo_attr_get     = lov_attr_get,
2031         .coo_attr_update  = lov_attr_update,
2032         .coo_conf_set     = lov_conf_set,
2033         .coo_getstripe    = lov_object_getstripe,
2034         .coo_layout_get   = lov_object_layout_get,
2035         .coo_maxbytes     = lov_object_maxbytes,
2036         .coo_fiemap       = lov_object_fiemap,
2037 };
2038
2039 static const struct lu_object_operations lov_lu_obj_ops = {
2040         .loo_object_init      = lov_object_init,
2041         .loo_object_delete    = lov_object_delete,
2042         .loo_object_release   = NULL,
2043         .loo_object_free      = lov_object_free,
2044         .loo_object_print     = lov_object_print,
2045         .loo_object_invariant = NULL
2046 };
2047
2048 struct lu_object *lov_object_alloc(const struct lu_env *env,
2049                                    const struct lu_object_header *unused,
2050                                    struct lu_device *dev)
2051 {
2052         struct lov_object *lov;
2053         struct lu_object  *obj;
2054
2055         ENTRY;
2056         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
2057         if (lov != NULL) {
2058                 obj = lov2lu(lov);
2059                 lu_object_init(obj, NULL, dev);
2060                 lov->lo_cl.co_ops = &lov_ops;
2061                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
2062                 /*
2063                  * object io operation vector (cl_object::co_iop) is installed
2064                  * later in lov_object_init(), as different vectors are used
2065                  * for object with different layouts.
2066                  */
2067                 obj->lo_ops = &lov_lu_obj_ops;
2068         } else
2069                 obj = NULL;
2070         RETURN(obj);
2071 }
2072
2073 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
2074 {
2075         struct lov_stripe_md *lsm = NULL;
2076
2077         lov_conf_freeze(lov);
2078         if (lov->lo_lsm != NULL) {
2079                 lsm = lsm_addref(lov->lo_lsm);
2080                 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
2081                         lsm, atomic_read(&lsm->lsm_refc),
2082                         lov->lo_layout_invalid, current);
2083         }
2084         lov_conf_thaw(lov);
2085         return lsm;
2086 }
2087
2088 int lov_read_and_clear_async_rc(struct cl_object *clob)
2089 {
2090         struct lu_object *luobj;
2091         int rc = 0;
2092         ENTRY;
2093
2094         luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
2095                                  &lov_device_type);
2096         if (luobj != NULL) {
2097                 struct lov_object *lov = lu2lov(luobj);
2098
2099                 lov_conf_freeze(lov);
2100                 switch (lov->lo_type) {
2101                 case LLT_COMP: {
2102                         struct lov_stripe_md *lsm;
2103                         int i;
2104
2105                         lsm = lov->lo_lsm;
2106                         LASSERT(lsm != NULL);
2107                         for (i = 0; i < lsm->lsm_entry_count; i++) {
2108                                 struct lov_stripe_md_entry *lse =
2109                                                 lsm->lsm_entries[i];
2110                                 int j;
2111
2112                                 if (!lsme_inited(lse))
2113                                         break;
2114
2115                                 for (j = 0; j < lse->lsme_stripe_count; j++) {
2116                                         struct lov_oinfo *loi =
2117                                                         lse->lsme_oinfo[j];
2118
2119                                         if (lov_oinfo_is_dummy(loi))
2120                                                 continue;
2121
2122                                         if (loi->loi_ar.ar_rc && !rc)
2123                                                 rc = loi->loi_ar.ar_rc;
2124                                         loi->loi_ar.ar_rc = 0;
2125                                 }
2126                         }
2127                 }
2128                 case LLT_RELEASED:
2129                 case LLT_EMPTY:
2130                         break;
2131                 default:
2132                         LBUG();
2133                 }
2134                 lov_conf_thaw(lov);
2135         }
2136         RETURN(rc);
2137 }
2138 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
2139
2140 /** @} lov */