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, 2017, 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 <linux/random.h>
  41
  42 #include "lov_cl_internal.h"
  43
  44 static inline struct lov_device *lov_object_dev(struct lov_object *obj)
  45 {
  46         return lu2lov_dev(obj->lo_cl.co_lu.lo_dev);
  47 }
  48
  49 /** \addtogroup lov
  50  *  @{
  51  */
  52
  53 /*****************************************************************************
  54  *
  55  * Layout operations.
  56  *
  57  */
  58
  59 struct lov_layout_operations {
  60         int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
  61                         struct lov_object *lov, struct lov_stripe_md *lsm,
  62                         const struct cl_object_conf *conf,
  63                         union lov_layout_state *state);
  64         int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
  65                            union lov_layout_state *state);
  66         void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
  67                          union lov_layout_state *state);
  68         int  (*llo_print)(const struct lu_env *env, void *cookie,
  69                           lu_printer_t p, const struct lu_object *o);
  70         int  (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
  71                               struct cl_page *page, pgoff_t index);
  72         int  (*llo_lock_init)(const struct lu_env *env,
  73                               struct cl_object *obj, struct cl_lock *lock,
  74                               const struct cl_io *io);
  75         int  (*llo_io_init)(const struct lu_env *env,
  76                             struct cl_object *obj, struct cl_io *io);
  77         int  (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
  78                             struct cl_attr *attr);
  79         int  (*llo_flush)(const struct lu_env *env, struct cl_object *obj,
  80                           struct ldlm_lock *lock);
  81 };
  82
  83 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
  84
  85 static void lov_lsm_put(struct lov_stripe_md *lsm)
  86 {
  87         if (lsm != NULL)
  88                 lov_free_memmd(&lsm);
  89 }
  90
  91 /*****************************************************************************
  92  *
  93  * Lov object layout operations.
  94  *
  95  */
  96
  97 static struct cl_object *lov_sub_find(const struct lu_env *env,
  98                                       struct cl_device *dev,
  99                                       const struct lu_fid *fid,
 100                                       const struct cl_object_conf *conf)
 101 {
 102         struct lu_object *o;
 103
 104         ENTRY;
 105
 106         o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
 107         LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
 108         RETURN(lu2cl(o));
 109 }
 110
 111 static int lov_page_slice_fixup(struct lov_object *lov,
 112                                 struct cl_object *stripe)
 113 {
 114         struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
 115         struct cl_object *o;
 116
 117         if (stripe == NULL)
 118                 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
 119                        cfs_size_round(sizeof(struct lov_page));
 120
 121         cl_object_for_each(o, stripe)
 122                 o->co_slice_off += hdr->coh_page_bufsize;
 123
 124         return cl_object_header(stripe)->coh_page_bufsize;
 125 }
 126
 127 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
 128                         struct cl_object *subobj, struct lov_oinfo *oinfo,
 129                         int idx)
 130 {
 131         struct cl_object_header *hdr;
 132         struct cl_object_header *subhdr;
 133         struct cl_object_header *parent;
 134         int entry = lov_comp_entry(idx);
 135         int stripe = lov_comp_stripe(idx);
 136         int result;
 137
 138         if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
 139                 /* For sanity:test_206.
 140                  * Do not leave the object in cache to avoid accessing
 141                  * freed memory. This is because osc_object is referring to
 142                  * lov_oinfo of lsm_stripe_data which will be freed due to
 143                  * this failure. */
 144                 cl_object_kill(env, subobj);
 145                 cl_object_put(env, subobj);
 146                 return -EIO;
 147         }
 148
 149         hdr = cl_object_header(lov2cl(lov));
 150         subhdr = cl_object_header(subobj);
 151
 152         CDEBUG(D_INODE, DFID"@%p[%d:%d] -> "DFID"@%p: ostid: "DOSTID
 153                " ost idx: %d gen: %d\n",
 154                PFID(lu_object_fid(&subobj->co_lu)), subhdr, entry, stripe,
 155                PFID(lu_object_fid(lov2lu(lov))), hdr, POSTID(&oinfo->loi_oi),
 156                oinfo->loi_ost_idx, oinfo->loi_ost_gen);
 157
 158         /* reuse ->coh_attr_guard to protect coh_parent change */
 159         spin_lock(&subhdr->coh_attr_guard);
 160         parent = subhdr->coh_parent;
 161         if (parent == NULL) {
 162                 struct lovsub_object *lso = cl2lovsub(subobj);
 163
 164                 subhdr->coh_parent = hdr;
 165                 spin_unlock(&subhdr->coh_attr_guard);
 166                 subhdr->coh_nesting = hdr->coh_nesting + 1;
 167                 lu_object_ref_add(&subobj->co_lu, "lov-parent", lov);
 168                 lso->lso_super = lov;
 169                 lso->lso_index = idx;
 170                 result = 0;
 171         } else {
 172                 struct lu_object  *old_obj;
 173                 struct lov_object *old_lov;
 174                 unsigned int mask = D_INODE;
 175
 176                 spin_unlock(&subhdr->coh_attr_guard);
 177                 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
 178                 LASSERT(old_obj != NULL);
 179                 old_lov = cl2lov(lu2cl(old_obj));
 180                 if (old_lov->lo_layout_invalid) {
 181                         /* the object's layout has already changed but isn't
 182                          * refreshed */
 183                         lu_object_unhash(env, &subobj->co_lu);
 184                         result = -EAGAIN;
 185                 } else {
 186                         mask = D_ERROR;
 187                         result = -EIO;
 188                 }
 189
 190                 LU_OBJECT_DEBUG(mask, env, &subobj->co_lu,
 191                                 "stripe %d is already owned.", idx);
 192                 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.");
 193                 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
 194                 cl_object_put(env, subobj);
 195         }
 196         return result;
 197 }
 198
 199 static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
 200                           struct lov_object *lov, unsigned int index,
 201                           const struct cl_object_conf *conf,
 202                           struct lov_layout_entry *lle)
 203 {
 204         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 205         struct lov_thread_info *lti = lov_env_info(env);
 206         struct cl_object_conf *subconf = &lti->lti_stripe_conf;
 207         struct lu_fid *ofid = &lti->lti_fid;
 208         struct cl_object *stripe;
 209         struct lov_stripe_md_entry *lse  = lov_lse(lov, index);
 210         int result;
 211         int psz, sz;
 212         int i;
 213
 214         ENTRY;
 215
 216         spin_lock_init(&r0->lo_sub_lock);
 217         r0->lo_nr = lse->lsme_stripe_count;
 218
 219         OBD_ALLOC_PTR_ARRAY_LARGE(r0->lo_sub, r0->lo_nr);
 220         if (r0->lo_sub == NULL)
 221                 GOTO(out, result = -ENOMEM);
 222
 223         psz = 0;
 224         result = 0;
 225         memset(subconf, 0, sizeof(*subconf));
 226
 227         /*
 228          * Create stripe cl_objects.
 229          */
 230         for (i = 0; i < r0->lo_nr; ++i) {
 231                 struct cl_device *subdev;
 232                 struct lov_oinfo *oinfo = lse->lsme_oinfo[i];
 233                 int ost_idx = oinfo->loi_ost_idx;
 234
 235                 if (lov_oinfo_is_dummy(oinfo))
 236                         continue;
 237
 238                 result = ostid_to_fid(ofid, &oinfo->loi_oi, oinfo->loi_ost_idx);
 239                 if (result != 0)
 240                         GOTO(out, result);
 241
 242                 if (dev->ld_target[ost_idx] == NULL) {
 243                         CERROR("%s: OST %04x is not initialized\n",
 244                                lov2obd(dev->ld_lov)->obd_name, ost_idx);
 245                         GOTO(out, result = -EIO);
 246                 }
 247
 248                 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 249                 subconf->u.coc_oinfo = oinfo;
 250                 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 251                 /* In the function below, .hs_keycmp resolves to
 252                  * lu_obj_hop_keycmp() */
 253                 /* coverity[overrun-buffer-val] */
 254                 stripe = lov_sub_find(env, subdev, ofid, subconf);
 255                 if (IS_ERR(stripe))
 256                         GOTO(out, result = PTR_ERR(stripe));
 257
 258                 result = lov_init_sub(env, lov, stripe, oinfo,
 259                                       lov_comp_index(index, i));
 260                 if (result == -EAGAIN) { /* try again */
 261                         --i;
 262                         result = 0;
 263                         continue;
 264                 }
 265
 266                 if (result == 0) {
 267                         r0->lo_sub[i] = cl2lovsub(stripe);
 268
 269                         sz = lov_page_slice_fixup(lov, stripe);
 270                         LASSERT(ergo(psz > 0, psz == sz));
 271                         psz = sz;
 272                 }
 273         }
 274         if (result == 0)
 275                 result = psz;
 276 out:
 277         RETURN(result);
 278 }
 279
 280 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 281                                struct lov_layout_raid0 *r0,
 282                                struct lovsub_object *los, int idx)
 283 {
 284         struct cl_object        *sub;
 285         struct lu_site          *site;
 286         wait_queue_head_t *wq;
 287
 288         LASSERT(r0->lo_sub[idx] == los);
 289
 290         sub = lovsub2cl(los);
 291         site = sub->co_lu.lo_dev->ld_site;
 292         wq = lu_site_wq_from_fid(site, &sub->co_lu.lo_header->loh_fid);
 293
 294         cl_object_kill(env, sub);
 295         /* release a reference to the sub-object and ... */
 296         lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
 297         cl_object_put(env, sub);
 298
 299         /* ... wait until it is actually destroyed---sub-object clears its
 300          * ->lo_sub[] slot in lovsub_object_free() */
 301         wait_event(*wq, r0->lo_sub[idx] != los);
 302         LASSERT(r0->lo_sub[idx] == NULL);
 303 }
 304
 305 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 306                              struct lov_layout_entry *lle)
 307 {
 308         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 309
 310         ENTRY;
 311
 312         if (r0->lo_sub != NULL) {
 313                 int i;
 314
 315                 for (i = 0; i < r0->lo_nr; ++i) {
 316                         struct lovsub_object *los = r0->lo_sub[i];
 317
 318                         if (los != NULL) {
 319                                 cl_object_prune(env, &los->lso_cl);
 320                                 /*
 321                                  * If top-level object is to be evicted from
 322                                  * the cache, so are its sub-objects.
 323                                  */
 324                                 lov_subobject_kill(env, lov, r0, los, i);
 325                         }
 326                 }
 327         }
 328
 329         EXIT;
 330 }
 331
 332 static void lov_fini_raid0(const struct lu_env *env,
 333                            struct lov_layout_entry *lle)
 334 {
 335         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 336
 337         if (r0->lo_sub != NULL) {
 338                 OBD_FREE_PTR_ARRAY_LARGE(r0->lo_sub, r0->lo_nr);
 339                 r0->lo_sub = NULL;
 340         }
 341 }
 342
 343 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 344                            lu_printer_t p, const struct lov_layout_entry *lle)
 345 {
 346         const struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 347         int i;
 348
 349         for (i = 0; i < r0->lo_nr; ++i) {
 350                 struct lu_object *sub;
 351
 352                 if (r0->lo_sub[i] != NULL) {
 353                         sub = lovsub2lu(r0->lo_sub[i]);
 354                         lu_object_print(env, cookie, p, sub);
 355                 } else {
 356                         (*p)(env, cookie, "sub %d absent\n", i);
 357                 }
 358         }
 359         return 0;
 360 }
 361
 362 static int lov_attr_get_raid0(const struct lu_env *env, struct lov_object *lov,
 363                               unsigned int index, struct lov_layout_entry *lle,
 364                               struct cl_attr **lov_attr)
 365 {
 366         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 367         struct lov_stripe_md *lsm = lov->lo_lsm;
 368         struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
 369         struct cl_attr *attr = &r0->lo_attr;
 370         __u64 kms = 0;
 371         int result = 0;
 372
 373         if (r0->lo_attr_valid) {
 374                 *lov_attr = attr;
 375                 return 0;
 376         }
 377
 378         memset(lvb, 0, sizeof(*lvb));
 379
 380         /* XXX: timestamps can be negative by sanity:test_39m,
 381          * how can it be? */
 382         lvb->lvb_atime = LLONG_MIN;
 383         lvb->lvb_ctime = LLONG_MIN;
 384         lvb->lvb_mtime = LLONG_MIN;
 385
 386         /*
 387          * XXX that should be replaced with a loop over sub-objects,
 388          * doing cl_object_attr_get() on them. But for now, let's
 389          * reuse old lov code.
 390          */
 391
 392         /*
 393          * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 394          * happy. It's not needed, because new code uses
 395          * ->coh_attr_guard spin-lock to protect consistency of
 396          * sub-object attributes.
 397          */
 398         lov_stripe_lock(lsm);
 399         result = lov_merge_lvb_kms(lsm, index, lvb, &kms);
 400         lov_stripe_unlock(lsm);
 401         if (result == 0) {
 402                 cl_lvb2attr(attr, lvb);
 403                 attr->cat_kms = kms;
 404                 r0->lo_attr_valid = 1;
 405                 *lov_attr = attr;
 406         }
 407
 408         return result;
 409 }
 410
 411 static struct lov_comp_layout_entry_ops raid0_ops = {
 412         .lco_init      = lov_init_raid0,
 413         .lco_fini      = lov_fini_raid0,
 414         .lco_getattr   = lov_attr_get_raid0,
 415 };
 416
 417 static int lov_attr_get_dom(const struct lu_env *env, struct lov_object *lov,
 418                             unsigned int index, struct lov_layout_entry *lle,
 419                             struct cl_attr **lov_attr)
 420 {
 421         struct lov_layout_dom *dom = &lle->lle_dom;
 422         struct lov_oinfo *loi = dom->lo_loi;
 423         struct cl_attr *attr = &dom->lo_dom_r0.lo_attr;
 424
 425         if (dom->lo_dom_r0.lo_attr_valid) {
 426                 *lov_attr = attr;
 427                 return 0;
 428         }
 429
 430         if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks))
 431                 return OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
 432
 433         cl_lvb2attr(attr, &loi->loi_lvb);
 434
 435         /* DoM component size can be bigger than stripe size after
 436          * client's setattr RPC, so do not count anything beyond
 437          * component end. Alternatively, check that limit on server
 438          * and do not allow size overflow there. */
 439         if (attr->cat_size > lle->lle_extent->e_end)
 440                 attr->cat_size = lle->lle_extent->e_end;
 441
 442         attr->cat_kms = attr->cat_size;
 443
 444         dom->lo_dom_r0.lo_attr_valid = 1;
 445         *lov_attr = attr;
 446
 447         return 0;
 448 }
 449
 450 /**
 451  * Lookup FLD to get MDS index of the given DOM object FID.
 452  *
 453  * \param[in]  ld       LOV device
 454  * \param[in]  fid      FID to lookup
 455  * \param[out] nr       index in MDC array to return back
 456  *
 457  * \retval              0 and \a mds filled with MDS index if successful
 458  * \retval              negative value on error
 459  */
 460 static int lov_fld_lookup(struct lov_device *ld, const struct lu_fid *fid,
 461                           __u32 *nr)
 462 {
 463         __u32 mds_idx;
 464         int i, rc;
 465
 466         ENTRY;
 467
 468         rc = fld_client_lookup(&ld->ld_lmv->u.lmv.lmv_fld, fid_seq(fid),
 469                                &mds_idx, LU_SEQ_RANGE_MDT, NULL);
 470         if (rc) {
 471                 CERROR("%s: error while looking for mds number. Seq %#llx"
 472                        ", err = %d\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 473                        fid_seq(fid), rc);
 474                 RETURN(rc);
 475         }
 476
 477         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
 478                mds_idx, PFID(fid));
 479
 480         /* find proper MDC device in the array */
 481         for (i = 0; i < ld->ld_md_tgts_nr; i++) {
 482                 if (ld->ld_md_tgts[i].ldm_mdc != NULL &&
 483                     ld->ld_md_tgts[i].ldm_idx == mds_idx)
 484                         break;
 485         }
 486
 487         if (i == ld->ld_md_tgts_nr) {
 488                 CERROR("%s: cannot find corresponding MDC device for mds #%x "
 489                        "for fid="DFID"\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 490                        mds_idx, PFID(fid));
 491                 rc = -EINVAL;
 492         } else {
 493                 *nr = i;
 494         }
 495         RETURN(rc);
 496 }
 497
 498 /**
 499  * Implementation of lov_comp_layout_entry_ops::lco_init for DOM object.
 500  *
 501  * Init the DOM object for the first time. It prepares also RAID0 entry
 502  * for it to use in common methods with ordinary RAID0 layout entries.
 503  *
 504  * \param[in] env       execution environment
 505  * \param[in] dev       LOV device
 506  * \param[in] lov       LOV object
 507  * \param[in] index     Composite layout entry index in LSM
 508  * \param[in] lle       Composite LOV layout entry
 509  */
 510 static int lov_init_dom(const struct lu_env *env, struct lov_device *dev,
 511                         struct lov_object *lov, unsigned int index,
 512                         const struct cl_object_conf *conf,
 513                         struct lov_layout_entry *lle)
 514 {
 515         struct lov_thread_info *lti = lov_env_info(env);
 516         struct lov_stripe_md_entry *lsme = lov_lse(lov, index);
 517         struct cl_object *clo;
 518         struct lu_object *o = lov2lu(lov);
 519         const struct lu_fid *fid = lu_object_fid(o);
 520         struct cl_device *mdcdev;
 521         struct lov_oinfo *loi = NULL;
 522         struct cl_object_conf *sconf = &lti->lti_stripe_conf;
 523         int rc;
 524         __u32 idx = 0;
 525
 526         ENTRY;
 527
 528         /* DOM entry may be not zero index due to FLR but must start from 0 */
 529         if (unlikely(lle->lle_extent->e_start != 0)) {
 530                 CERROR("%s: DOM entry must be the first stripe in a mirror\n",
 531                        lov2obd(dev->ld_lov)->obd_name);
 532                 dump_lsm(D_ERROR, lov->lo_lsm);
 533                 RETURN(-EINVAL);
 534         }
 535
 536         /* find proper MDS device */
 537         rc = lov_fld_lookup(dev, fid, &idx);
 538         if (rc)
 539                 RETURN(rc);
 540
 541         LASSERTF(dev->ld_md_tgts[idx].ldm_mdc != NULL,
 542                  "LOV md target[%u] is NULL\n", idx);
 543
 544         /* check lsm is DOM, more checks are needed */
 545         LASSERT(lsme->lsme_stripe_count == 0);
 546
 547         /*
 548          * Create lower cl_objects.
 549          */
 550         mdcdev = dev->ld_md_tgts[idx].ldm_mdc;
 551
 552         LASSERTF(mdcdev != NULL, "non-initialized mdc subdev\n");
 553
 554         /* DoM object has no oinfo in LSM entry, create it exclusively */
 555         OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 556         if (loi == NULL)
 557                 RETURN(-ENOMEM);
 558
 559         fid_to_ostid(lu_object_fid(lov2lu(lov)), &loi->loi_oi);
 560
 561         sconf->u.coc_oinfo = loi;
 562 again:
 563         clo = lov_sub_find(env, mdcdev, fid, sconf);
 564         if (IS_ERR(clo))
 565                 GOTO(out, rc = PTR_ERR(clo));
 566
 567         rc = lov_init_sub(env, lov, clo, loi, lov_comp_index(index, 0));
 568         if (rc == -EAGAIN) /* try again */
 569                 goto again;
 570         else if (rc != 0)
 571                 GOTO(out, rc);
 572
 573         lle->lle_dom.lo_dom = cl2lovsub(clo);
 574         spin_lock_init(&lle->lle_dom.lo_dom_r0.lo_sub_lock);
 575         lle->lle_dom.lo_dom_r0.lo_nr = 1;
 576         lle->lle_dom.lo_dom_r0.lo_sub = &lle->lle_dom.lo_dom;
 577         lle->lle_dom.lo_loi = loi;
 578
 579         rc = lov_page_slice_fixup(lov, clo);
 580         RETURN(rc);
 581
 582 out:
 583         if (loi != NULL)
 584                 OBD_SLAB_FREE_PTR(loi, lov_oinfo_slab);
 585         return rc;
 586 }
 587
 588 /**
 589  * Implementation of lov_layout_operations::llo_fini for DOM object.
 590  *
 591  * Finish the DOM object and free related memory.
 592  *
 593  * \param[in] env       execution environment
 594  * \param[in] lov       LOV object
 595  * \param[in] state     LOV layout state
 596  */
 597 static void lov_fini_dom(const struct lu_env *env,
 598                          struct lov_layout_entry *lle)
 599 {
 600         if (lle->lle_dom.lo_dom != NULL)
 601                 lle->lle_dom.lo_dom = NULL;
 602         if (lle->lle_dom.lo_loi != NULL)
 603                 OBD_SLAB_FREE_PTR(lle->lle_dom.lo_loi, lov_oinfo_slab);
 604 }
 605
 606 static struct lov_comp_layout_entry_ops dom_ops = {
 607         .lco_init = lov_init_dom,
 608         .lco_fini = lov_fini_dom,
 609         .lco_getattr = lov_attr_get_dom,
 610 };
 611
 612 static int lov_init_composite(const struct lu_env *env, struct lov_device *dev,
 613                               struct lov_object *lov, struct lov_stripe_md *lsm,
 614                               const struct cl_object_conf *conf,
 615                               union lov_layout_state *state)
 616 {
 617         struct lov_layout_composite *comp = &state->composite;
 618         struct lov_layout_entry *lle;
 619         struct lov_mirror_entry *lre;
 620         unsigned int entry_count;
 621         unsigned int psz = 0;
 622         unsigned int mirror_count;
 623         int flr_state = lsm->lsm_flags & LCM_FL_FLR_MASK;
 624         int result = 0;
 625         unsigned int seq;
 626         int i, j;
 627         bool dom_size = 0;
 628
 629         ENTRY;
 630
 631         LASSERT(lsm->lsm_entry_count > 0);
 632         LASSERT(lov->lo_lsm == NULL);
 633         lov->lo_lsm = lsm_addref(lsm);
 634         lov->lo_layout_invalid = true;
 635
 636         dump_lsm(D_INODE, lsm);
 637
 638         entry_count = lsm->lsm_entry_count;
 639
 640         spin_lock_init(&comp->lo_write_lock);
 641         comp->lo_flags = lsm->lsm_flags;
 642         comp->lo_mirror_count = lsm->lsm_mirror_count + 1;
 643         comp->lo_entry_count = lsm->lsm_entry_count;
 644         comp->lo_preferred_mirror = -1;
 645
 646         if (equi(flr_state == LCM_FL_NONE, comp->lo_mirror_count > 1))
 647                 RETURN(-EINVAL);
 648
 649         OBD_ALLOC_PTR_ARRAY(comp->lo_mirrors, comp->lo_mirror_count);
 650         if (comp->lo_mirrors == NULL)
 651                 RETURN(-ENOMEM);
 652
 653         OBD_ALLOC_PTR_ARRAY(comp->lo_entries, entry_count);
 654         if (comp->lo_entries == NULL)
 655                 RETURN(-ENOMEM);
 656
 657         /* Initiate all entry types and extents data at first */
 658         for (i = 0, j = 0, mirror_count = 1; i < entry_count; i++) {
 659                 int mirror_id = 0;
 660
 661                 lle = &comp->lo_entries[i];
 662
 663                 lle->lle_lsme = lsm->lsm_entries[i];
 664                 lle->lle_type = lov_entry_type(lle->lle_lsme);
 665                 switch (lle->lle_type) {
 666                 case LOV_PATTERN_RAID0:
 667                         lle->lle_comp_ops = &raid0_ops;
 668                         break;
 669                 case LOV_PATTERN_MDT:
 670                         /* Allowed to have several DOM stripes in different
 671                          * mirrors with the same DoM size.
 672                          */
 673                         if (!dom_size) {
 674                                 dom_size = lle->lle_lsme->lsme_extent.e_end;
 675                         } else if (dom_size !=
 676                                    lle->lle_lsme->lsme_extent.e_end) {
 677                                 CERROR("%s: DOM entries with different sizes\n",
 678                                        lov2obd(dev->ld_lov)->obd_name);
 679                                 dump_lsm(D_ERROR, lsm);
 680                                 RETURN(-EINVAL);
 681                         }
 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_NONE)
 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_PREF_RD);
 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. It uses the hash value of lov_object
 760          * so that different clients would use different mirrors for read. */
 761         mirror_count = 0;
 762         seq = hash_long((unsigned long)lov, 8);
 763         for (i = 0; i < comp->lo_mirror_count; i++) {
 764                 unsigned int idx = (i + seq) % comp->lo_mirror_count;
 765
 766                 lre = lov_mirror_entry(lov, idx);
 767                 if (lre->lre_stale)
 768                         continue;
 769
 770                 mirror_count++; /* valid mirror */
 771
 772                 if (lre->lre_preferred || comp->lo_preferred_mirror < 0)
 773                         comp->lo_preferred_mirror = idx;
 774         }
 775         if (!mirror_count) {
 776                 CDEBUG(D_INODE, DFID
 777                        " doesn't have any valid mirrors\n",
 778                        PFID(lu_object_fid(lov2lu(lov))));
 779
 780                 comp->lo_preferred_mirror = 0;
 781         }
 782
 783         LASSERT(comp->lo_preferred_mirror >= 0);
 784
 785         EXIT;
 786 out:
 787         return result > 0 ? 0 : result;
 788 }
 789
 790 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
 791                           struct lov_object *lov, struct lov_stripe_md *lsm,
 792                           const struct cl_object_conf *conf,
 793                           union lov_layout_state *state)
 794 {
 795         return 0;
 796 }
 797
 798 static int lov_init_released(const struct lu_env *env,
 799                              struct lov_device *dev, struct lov_object *lov,
 800                              struct lov_stripe_md *lsm,
 801                              const struct cl_object_conf *conf,
 802                              union lov_layout_state *state)
 803 {
 804         LASSERT(lsm != NULL);
 805         LASSERT(lsm->lsm_is_released);
 806         LASSERT(lov->lo_lsm == NULL);
 807
 808         lov->lo_lsm = lsm_addref(lsm);
 809         return 0;
 810 }
 811
 812 static int lov_init_foreign(const struct lu_env *env,
 813                             struct lov_device *dev, struct lov_object *lov,
 814                             struct lov_stripe_md *lsm,
 815                             const struct cl_object_conf *conf,
 816                             union lov_layout_state *state)
 817 {
 818         LASSERT(lsm != NULL);
 819         LASSERT(lov->lo_type == LLT_FOREIGN);
 820         LASSERT(lov->lo_lsm == NULL);
 821
 822         lov->lo_lsm = lsm_addref(lsm);
 823         return 0;
 824 }
 825
 826 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 827                             union lov_layout_state *state)
 828 {
 829         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED ||
 830                 lov->lo_type == LLT_FOREIGN);
 831
 832         lov_layout_wait(env, lov);
 833         return 0;
 834 }
 835
 836 static int lov_delete_composite(const struct lu_env *env,
 837                                 struct lov_object *lov,
 838                                 union lov_layout_state *state)
 839 {
 840         struct lov_layout_entry *entry;
 841         struct lov_layout_composite *comp = &state->composite;
 842
 843         ENTRY;
 844
 845         dump_lsm(D_INODE, lov->lo_lsm);
 846
 847         lov_layout_wait(env, lov);
 848         if (comp->lo_entries)
 849                 lov_foreach_layout_entry(lov, entry)
 850                         lov_delete_raid0(env, lov, entry);
 851
 852         RETURN(0);
 853 }
 854
 855 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 856                            union lov_layout_state *state)
 857 {
 858         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 859 }
 860
 861 static void lov_fini_composite(const struct lu_env *env,
 862                                struct lov_object *lov,
 863                                union lov_layout_state *state)
 864 {
 865         struct lov_layout_composite *comp = &state->composite;
 866         ENTRY;
 867
 868         if (comp->lo_entries != NULL) {
 869                 struct lov_layout_entry *entry;
 870
 871                 lov_foreach_layout_entry(lov, entry)
 872                         if (entry->lle_comp_ops)
 873                                 entry->lle_comp_ops->lco_fini(env, entry);
 874
 875                 OBD_FREE_PTR_ARRAY(comp->lo_entries, comp->lo_entry_count);
 876                 comp->lo_entries = NULL;
 877         }
 878
 879         if (comp->lo_mirrors != NULL) {
 880                 OBD_FREE_PTR_ARRAY(comp->lo_mirrors, comp->lo_mirror_count);
 881                 comp->lo_mirrors = NULL;
 882         }
 883
 884         memset(comp, 0, sizeof(*comp));
 885
 886         dump_lsm(D_INODE, lov->lo_lsm);
 887         lov_free_memmd(&lov->lo_lsm);
 888
 889         EXIT;
 890 }
 891
 892 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
 893                                 union lov_layout_state *state)
 894 {
 895         ENTRY;
 896         dump_lsm(D_INODE, lov->lo_lsm);
 897         lov_free_memmd(&lov->lo_lsm);
 898         EXIT;
 899 }
 900
 901 static int lov_print_empty(const struct lu_env *env, void *cookie,
 902                            lu_printer_t p, const struct lu_object *o)
 903 {
 904         (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
 905         return 0;
 906 }
 907
 908 static int lov_print_composite(const struct lu_env *env, void *cookie,
 909                                lu_printer_t p, const struct lu_object *o)
 910 {
 911         struct lov_object *lov = lu2lov(o);
 912         struct lov_stripe_md *lsm = lov->lo_lsm;
 913         int i;
 914
 915         (*p)(env, cookie, "entries: %d, %s, lsm{%p 0x%08X %d %u}:\n",
 916              lsm->lsm_entry_count,
 917              lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 918              lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 919              lsm->lsm_layout_gen);
 920
 921         for (i = 0; i < lsm->lsm_entry_count; i++) {
 922                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 923                 struct lov_layout_entry *lle = lov_entry(lov, i);
 924
 925                 (*p)(env, cookie,
 926                      DEXT ": { 0x%08X, %u, %#x, %u, %#x, %u, %u }\n",
 927                      PEXT(&lse->lsme_extent), lse->lsme_magic,
 928                      lse->lsme_id, lse->lsme_pattern, lse->lsme_layout_gen,
 929                      lse->lsme_flags, lse->lsme_stripe_count,
 930                      lse->lsme_stripe_size);
 931                 lov_print_raid0(env, cookie, p, lle);
 932         }
 933
 934         return 0;
 935 }
 936
 937 static int lov_print_released(const struct lu_env *env, void *cookie,
 938                                 lu_printer_t p, const struct lu_object *o)
 939 {
 940         struct lov_object       *lov = lu2lov(o);
 941         struct lov_stripe_md    *lsm = lov->lo_lsm;
 942
 943         (*p)(env, cookie,
 944                 "released: %s, lsm{%p 0x%08X %d %u}:\n",
 945                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 946                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 947                 lsm->lsm_layout_gen);
 948         return 0;
 949 }
 950
 951 static int lov_print_foreign(const struct lu_env *env, void *cookie,
 952                                 lu_printer_t p, const struct lu_object *o)
 953 {
 954         struct lov_object       *lov = lu2lov(o);
 955         struct lov_stripe_md    *lsm = lov->lo_lsm;
 956
 957         (*p)(env, cookie,
 958                 "foreign: %s, lsm{%p 0x%08X %d %u}:\n",
 959                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 960                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 961                 lsm->lsm_layout_gen);
 962         (*p)(env, cookie,
 963                 "raw_ea_content '%.*s'\n",
 964                 (int)lsm->lsm_foreign_size, (char *)lsm_foreign(lsm));
 965         return 0;
 966 }
 967
 968 /**
 969  * Implements cl_object_operations::coo_attr_get() method for an object
 970  * without stripes (LLT_EMPTY layout type).
 971  *
 972  * The only attributes this layer is authoritative in this case is
 973  * cl_attr::cat_blocks---it's 0.
 974  */
 975 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 976                               struct cl_attr *attr)
 977 {
 978         attr->cat_blocks = 0;
 979         return 0;
 980 }
 981
 982 static int lov_attr_get_composite(const struct lu_env *env,
 983                                   struct cl_object *obj,
 984                                   struct cl_attr *attr)
 985 {
 986         struct lov_object       *lov = cl2lov(obj);
 987         struct lov_layout_entry *entry;
 988         int                      result = 0;
 989
 990         ENTRY;
 991
 992         attr->cat_size = 0;
 993         attr->cat_blocks = 0;
 994         lov_foreach_layout_entry(lov, entry) {
 995                 struct cl_attr *lov_attr = NULL;
 996                 int index = lov_layout_entry_index(lov, entry);
 997
 998                 if (!entry->lle_valid)
 999                         continue;
1000
1001                 /* PFL: This component has not been init-ed. */
1002                 if (!lsm_entry_inited(lov->lo_lsm, index))
1003                         continue;
1004
1005                 result = entry->lle_comp_ops->lco_getattr(env, lov, index,
1006                                                           entry, &lov_attr);
1007                 if (result < 0)
1008                         RETURN(result);
1009
1010                 if (lov_attr == NULL)
1011                         continue;
1012
1013                 CDEBUG(D_INODE, "COMP ID #%i: s=%llu m=%llu a=%llu c=%llu "
1014                        "b=%llu\n", index - 1, lov_attr->cat_size,
1015                        lov_attr->cat_mtime, lov_attr->cat_atime,
1016                        lov_attr->cat_ctime, lov_attr->cat_blocks);
1017
1018                 /* merge results */
1019                 attr->cat_blocks += lov_attr->cat_blocks;
1020                 if (attr->cat_size < lov_attr->cat_size)
1021                         attr->cat_size = lov_attr->cat_size;
1022                 if (attr->cat_kms < lov_attr->cat_kms)
1023                         attr->cat_kms = lov_attr->cat_kms;
1024                 if (attr->cat_atime < lov_attr->cat_atime)
1025                         attr->cat_atime = lov_attr->cat_atime;
1026                 if (attr->cat_ctime < lov_attr->cat_ctime)
1027                         attr->cat_ctime = lov_attr->cat_ctime;
1028                 if (attr->cat_mtime < lov_attr->cat_mtime)
1029                         attr->cat_mtime = lov_attr->cat_mtime;
1030         }
1031
1032         RETURN(0);
1033 }
1034
1035 static int lov_flush_composite(const struct lu_env *env,
1036                                struct cl_object *obj,
1037                                struct ldlm_lock *lock)
1038 {
1039         struct lov_object *lov = cl2lov(obj);
1040         struct lov_layout_entry *lle;
1041         int rc = -ENODATA;
1042
1043         ENTRY;
1044
1045         lov_foreach_layout_entry(lov, lle) {
1046                 if (!lsme_is_dom(lle->lle_lsme))
1047                         continue;
1048                 rc = cl_object_flush(env, lovsub2cl(lle->lle_dom.lo_dom), lock);
1049                 break;
1050         }
1051
1052         RETURN(rc);
1053 }
1054
1055 static int lov_flush_empty(const struct lu_env *env, struct cl_object *obj,
1056                            struct ldlm_lock *lock)
1057 {
1058         return 0;
1059 }
1060
1061 const static struct lov_layout_operations lov_dispatch[] = {
1062         [LLT_EMPTY] = {
1063                 .llo_init      = lov_init_empty,
1064                 .llo_delete    = lov_delete_empty,
1065                 .llo_fini      = lov_fini_empty,
1066                 .llo_print     = lov_print_empty,
1067                 .llo_page_init = lov_page_init_empty,
1068                 .llo_lock_init = lov_lock_init_empty,
1069                 .llo_io_init   = lov_io_init_empty,
1070                 .llo_getattr   = lov_attr_get_empty,
1071                 .llo_flush     = lov_flush_empty,
1072         },
1073         [LLT_RELEASED] = {
1074                 .llo_init      = lov_init_released,
1075                 .llo_delete    = lov_delete_empty,
1076                 .llo_fini      = lov_fini_released,
1077                 .llo_print     = lov_print_released,
1078                 .llo_page_init = lov_page_init_empty,
1079                 .llo_lock_init = lov_lock_init_empty,
1080                 .llo_io_init   = lov_io_init_released,
1081                 .llo_getattr   = lov_attr_get_empty,
1082                 .llo_flush     = lov_flush_empty,
1083         },
1084         [LLT_COMP] = {
1085                 .llo_init      = lov_init_composite,
1086                 .llo_delete    = lov_delete_composite,
1087                 .llo_fini      = lov_fini_composite,
1088                 .llo_print     = lov_print_composite,
1089                 .llo_page_init = lov_page_init_composite,
1090                 .llo_lock_init = lov_lock_init_composite,
1091                 .llo_io_init   = lov_io_init_composite,
1092                 .llo_getattr   = lov_attr_get_composite,
1093                 .llo_flush     = lov_flush_composite,
1094         },
1095         [LLT_FOREIGN] = {
1096                 .llo_init      = lov_init_foreign,
1097                 .llo_delete    = lov_delete_empty,
1098                 .llo_fini      = lov_fini_released,
1099                 .llo_print     = lov_print_foreign,
1100                 .llo_page_init = lov_page_init_foreign,
1101                 .llo_lock_init = lov_lock_init_empty,
1102                 .llo_io_init   = lov_io_init_empty,
1103                 .llo_getattr   = lov_attr_get_empty,
1104                 .llo_flush     = lov_flush_empty,
1105         },
1106 };
1107
1108 /**
1109  * Performs a double-dispatch based on the layout type of an object.
1110  */
1111 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)              \
1112 ({                                                      \
1113         struct lov_object *__obj = (obj);               \
1114         enum lov_layout_type __llt;                     \
1115                                                         \
1116         __llt = __obj->lo_type;                         \
1117         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));      \
1118         lov_dispatch[__llt].op(__VA_ARGS__);            \
1119 })
1120
1121 /**
1122  * Return lov_layout_type associated with a given lsm
1123  */
1124 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
1125 {
1126         if (lsm == NULL)
1127                 return LLT_EMPTY;
1128
1129         if (lsm->lsm_is_released)
1130                 return LLT_RELEASED;
1131
1132         if (lsm->lsm_magic == LOV_MAGIC_V1 ||
1133             lsm->lsm_magic == LOV_MAGIC_V3 ||
1134             lsm->lsm_magic == LOV_MAGIC_COMP_V1)
1135                 return LLT_COMP;
1136
1137         if (lsm->lsm_magic == LOV_MAGIC_FOREIGN)
1138                 return LLT_FOREIGN;
1139
1140         return LLT_EMPTY;
1141 }
1142
1143 static inline void lov_conf_freeze(struct lov_object *lov)
1144 {
1145         CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
1146                 lov, lov->lo_owner, current);
1147         if (lov->lo_owner != current)
1148                 down_read(&lov->lo_type_guard);
1149 }
1150
1151 static inline void lov_conf_thaw(struct lov_object *lov)
1152 {
1153         CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
1154                 lov, lov->lo_owner, current);
1155         if (lov->lo_owner != current)
1156                 up_read(&lov->lo_type_guard);
1157 }
1158
1159 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
1160 ({                                                                      \
1161         struct lov_object                      *__obj = (obj);          \
1162         int                                     __lock = !!(lock);      \
1163         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
1164                                                                         \
1165         if (__lock)                                                     \
1166                 lov_conf_freeze(__obj);                                 \
1167         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
1168         if (__lock)                                                     \
1169                 lov_conf_thaw(__obj);                                   \
1170         __result;                                                       \
1171 })
1172
1173 /**
1174  * Performs a locked double-dispatch based on the layout type of an object.
1175  */
1176 #define LOV_2DISPATCH(obj, op, ...)                     \
1177         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
1178
1179 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
1180 do {                                                                    \
1181         struct lov_object                      *__obj = (obj);          \
1182         enum lov_layout_type                    __llt;                  \
1183                                                                         \
1184         lov_conf_freeze(__obj);                                         \
1185         __llt = __obj->lo_type;                                         \
1186         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));                      \
1187         lov_dispatch[__llt].op(__VA_ARGS__);                            \
1188         lov_conf_thaw(__obj);                                           \
1189 } while (0)
1190
1191 static void lov_conf_lock(struct lov_object *lov)
1192 {
1193         LASSERT(lov->lo_owner != current);
1194         down_write(&lov->lo_type_guard);
1195         LASSERT(lov->lo_owner == NULL);
1196         lov->lo_owner = current;
1197         CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
1198                 lov, lov->lo_owner);
1199 }
1200
1201 static void lov_conf_unlock(struct lov_object *lov)
1202 {
1203         CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
1204                 lov, lov->lo_owner);
1205         lov->lo_owner = NULL;
1206         up_write(&lov->lo_type_guard);
1207 }
1208
1209 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
1210 {
1211         ENTRY;
1212
1213         while (atomic_read(&lov->lo_active_ios) > 0) {
1214                 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
1215                         PFID(lu_object_fid(lov2lu(lov))),
1216                         atomic_read(&lov->lo_active_ios));
1217
1218                 wait_event_idle(lov->lo_waitq,
1219                                 atomic_read(&lov->lo_active_ios) == 0);
1220         }
1221         RETURN(0);
1222 }
1223
1224 static int lov_layout_change(const struct lu_env *unused,
1225                              struct lov_object *lov, struct lov_stripe_md *lsm,
1226                              const struct cl_object_conf *conf)
1227 {
1228         enum lov_layout_type llt = lov_type(lsm);
1229         union lov_layout_state *state = &lov->u;
1230         const struct lov_layout_operations *old_ops;
1231         const struct lov_layout_operations *new_ops;
1232         struct lov_device *lov_dev = lov_object_dev(lov);
1233         struct lu_env *env;
1234         __u16 refcheck;
1235         int rc;
1236         ENTRY;
1237
1238         LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch));
1239
1240         env = cl_env_get(&refcheck);
1241         if (IS_ERR(env))
1242                 RETURN(PTR_ERR(env));
1243
1244         LASSERT(llt < ARRAY_SIZE(lov_dispatch));
1245
1246         CDEBUG(D_INODE, DFID" from %s to %s\n",
1247                PFID(lu_object_fid(lov2lu(lov))),
1248                llt2str(lov->lo_type), llt2str(llt));
1249
1250         old_ops = &lov_dispatch[lov->lo_type];
1251         new_ops = &lov_dispatch[llt];
1252
1253         rc = cl_object_prune(env, &lov->lo_cl);
1254         if (rc != 0)
1255                 GOTO(out, rc);
1256
1257         rc = old_ops->llo_delete(env, lov, &lov->u);
1258         if (rc != 0)
1259                 GOTO(out, rc);
1260
1261         old_ops->llo_fini(env, lov, &lov->u);
1262
1263         LASSERT(atomic_read(&lov->lo_active_ios) == 0);
1264
1265         CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
1266                PFID(lu_object_fid(lov2lu(lov))), lov, llt);
1267
1268         /* page bufsize fixup */
1269         cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
1270                 lov_page_slice_fixup(lov, NULL);
1271
1272         lov->lo_type = llt;
1273         rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
1274         if (rc != 0) {
1275                 struct obd_device *obd = lov2obd(lov_dev->ld_lov);
1276
1277                 CERROR("%s: cannot apply new layout on "DFID" : rc = %d\n",
1278                        obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
1279                 new_ops->llo_delete(env, lov, state);
1280                 new_ops->llo_fini(env, lov, state);
1281                 /* this file becomes an EMPTY file. */
1282                 lov->lo_type = LLT_EMPTY;
1283                 GOTO(out, rc);
1284         }
1285
1286 out:
1287         cl_env_put(env, &refcheck);
1288         RETURN(rc);
1289 }
1290
1291 /*****************************************************************************
1292  *
1293  * Lov object operations.
1294  *
1295  */
1296 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
1297                     const struct lu_object_conf *conf)
1298 {
1299         struct lov_object            *lov   = lu2lov(obj);
1300         struct lov_device            *dev   = lov_object_dev(lov);
1301         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
1302         union lov_layout_state       *set   = &lov->u;
1303         const struct lov_layout_operations *ops;
1304         struct lov_stripe_md *lsm = NULL;
1305         int rc;
1306         ENTRY;
1307
1308         init_rwsem(&lov->lo_type_guard);
1309         atomic_set(&lov->lo_active_ios, 0);
1310         init_waitqueue_head(&lov->lo_waitq);
1311         cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
1312
1313         lov->lo_type = LLT_EMPTY;
1314         if (cconf->u.coc_layout.lb_buf != NULL) {
1315                 lsm = lov_unpackmd(dev->ld_lov,
1316                                    cconf->u.coc_layout.lb_buf,
1317                                    cconf->u.coc_layout.lb_len);
1318                 if (IS_ERR(lsm))
1319                         RETURN(PTR_ERR(lsm));
1320
1321                 dump_lsm(D_INODE, lsm);
1322         }
1323
1324         /* no locking is necessary, as object is being created */
1325         lov->lo_type = lov_type(lsm);
1326         ops = &lov_dispatch[lov->lo_type];
1327         rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
1328         if (rc != 0)
1329                 GOTO(out_lsm, rc);
1330
1331 out_lsm:
1332         lov_lsm_put(lsm);
1333
1334         RETURN(rc);
1335 }
1336
1337 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
1338                         const struct cl_object_conf *conf)
1339 {
1340         struct lov_stripe_md    *lsm = NULL;
1341         struct lov_object       *lov = cl2lov(obj);
1342         int                      result = 0;
1343         ENTRY;
1344
1345         if (conf->coc_opc == OBJECT_CONF_SET &&
1346             conf->u.coc_layout.lb_buf != NULL) {
1347                 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
1348                                    conf->u.coc_layout.lb_buf,
1349                                    conf->u.coc_layout.lb_len);
1350                 if (IS_ERR(lsm))
1351                         RETURN(PTR_ERR(lsm));
1352                 dump_lsm(D_INODE, lsm);
1353         }
1354
1355         lov_conf_lock(lov);
1356         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
1357                 lov->lo_layout_invalid = true;
1358                 GOTO(out, result = 0);
1359         }
1360
1361         if (conf->coc_opc == OBJECT_CONF_WAIT) {
1362                 if (lov->lo_layout_invalid &&
1363                     atomic_read(&lov->lo_active_ios) > 0) {
1364                         lov_conf_unlock(lov);
1365                         result = lov_layout_wait(env, lov);
1366                         lov_conf_lock(lov);
1367                 }
1368                 GOTO(out, result);
1369         }
1370
1371         LASSERT(conf->coc_opc == OBJECT_CONF_SET);
1372
1373         if ((lsm == NULL && lov->lo_lsm == NULL) ||
1374             ((lsm != NULL && lov->lo_lsm != NULL) &&
1375              (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
1376              (lov->lo_lsm->lsm_entries[0]->lsme_pattern ==
1377               lsm->lsm_entries[0]->lsme_pattern))) {
1378                 /* same version of layout */
1379                 lov->lo_layout_invalid = false;
1380                 GOTO(out, result = 0);
1381         }
1382
1383         /* will change layout - check if there still exists active IO. */
1384         if (atomic_read(&lov->lo_active_ios) > 0) {
1385                 lov->lo_layout_invalid = true;
1386                 GOTO(out, result = -EBUSY);
1387         }
1388
1389         result = lov_layout_change(env, lov, lsm, conf);
1390         lov->lo_layout_invalid = result != 0;
1391         EXIT;
1392
1393 out:
1394         lov_conf_unlock(lov);
1395         lov_lsm_put(lsm);
1396         CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
1397                PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
1398         RETURN(result);
1399 }
1400
1401 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
1402 {
1403         struct lov_object *lov = lu2lov(obj);
1404
1405         ENTRY;
1406         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
1407         EXIT;
1408 }
1409
1410 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
1411 {
1412         struct lov_object *lov = lu2lov(obj);
1413
1414         ENTRY;
1415         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
1416         lu_object_fini(obj);
1417         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
1418         EXIT;
1419 }
1420
1421 static int lov_object_print(const struct lu_env *env, void *cookie,
1422                             lu_printer_t p, const struct lu_object *o)
1423 {
1424         return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
1425 }
1426
1427 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
1428                   struct cl_page *page, pgoff_t index)
1429 {
1430         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
1431                                     index);
1432 }
1433
1434 /**
1435  * Implements cl_object_operations::clo_io_init() method for lov
1436  * layer. Dispatches to the appropriate layout io initialization method.
1437  */
1438 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
1439                 struct cl_io *io)
1440 {
1441         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_preserved);
1442
1443         CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
1444                PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
1445                io->ci_ignore_layout, io->ci_verify_layout);
1446
1447         /* IO type CIT_MISC with ci_ignore_layout set are usually invoked from
1448          * the OSC layer. It shouldn't take lov layout conf lock in that case,
1449          * because as long as the OSC object exists, the layout can't be
1450          * reconfigured. */
1451         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
1452                         !(io->ci_ignore_layout && io->ci_type == CIT_MISC),
1453                         env, obj, io);
1454 }
1455
1456 /**
1457  * An implementation of cl_object_operations::clo_attr_get() method for lov
1458  * layer. For raid0 layout this collects and merges attributes of all
1459  * sub-objects.
1460  */
1461 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
1462                         struct cl_attr *attr)
1463 {
1464         /* do not take lock, as this function is called under a
1465          * spin-lock. Layout is protected from changing by ongoing IO. */
1466         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
1467 }
1468
1469 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1470                            const struct cl_attr *attr, unsigned valid)
1471 {
1472         /*
1473          * No dispatch is required here, as no layout implements this.
1474          */
1475         return 0;
1476 }
1477
1478 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1479                   struct cl_lock *lock, const struct cl_io *io)
1480 {
1481         /* No need to lock because we've taken one refcount of layout.  */
1482         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1483                                     io);
1484 }
1485
1486 /**
1487  * We calculate on which OST the mapping will end. If the length of mapping
1488  * is greater than (stripe_size * stripe_count) then the last_stripe will
1489  * will be one just before start_stripe. Else we check if the mapping
1490  * intersects each OST and find last_stripe.
1491  * This function returns the last_stripe and also sets the stripe_count
1492  * over which the mapping is spread
1493  *
1494  * \param lsm [in]              striping information for the file
1495  * \param index [in]            stripe component index
1496  * \param ext [in]              logical extent of mapping
1497  * \param start_stripe [in]     starting stripe of the mapping
1498  * \param stripe_count [out]    the number of stripes across which to map is
1499  *                              returned
1500  *
1501  * \retval last_stripe          return the last stripe of the mapping
1502  */
1503 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, int index,
1504                                    struct lu_extent *ext,
1505                                    int start_stripe, int *stripe_count)
1506 {
1507         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1508         int last_stripe;
1509         u64 obd_start;
1510         u64 obd_end;
1511         int i, j;
1512
1513         if (ext->e_end - ext->e_start >
1514             lsme->lsme_stripe_size * lsme->lsme_stripe_count) {
1515                 last_stripe = (start_stripe < 1 ? lsme->lsme_stripe_count - 1 :
1516                                                   start_stripe - 1);
1517                 *stripe_count = lsme->lsme_stripe_count;
1518         } else {
1519                 for (j = 0, i = start_stripe; j < lsme->lsme_stripe_count;
1520                      i = (i + 1) % lsme->lsme_stripe_count, j++) {
1521                         if ((lov_stripe_intersects(lsm, index,  i, ext,
1522                                                    &obd_start, &obd_end)) == 0)
1523                                 break;
1524                 }
1525                 *stripe_count = j;
1526                 last_stripe = (start_stripe + j - 1) % lsme->lsme_stripe_count;
1527         }
1528
1529         return last_stripe;
1530 }
1531
1532 /**
1533  * Set fe_device and copy extents from local buffer into main return buffer.
1534  *
1535  * \param fiemap [out]          fiemap to hold all extents
1536  * \param lcl_fm_ext [in]       array of fiemap extents get from OSC layer
1537  * \param ost_index [in]        OST index to be written into the fm_device
1538  *                              field for each extent
1539  * \param ext_count [in]        number of extents to be copied
1540  * \param current_extent [in]   where to start copying in the extent array
1541  */
1542 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1543                                          struct fiemap_extent *lcl_fm_ext,
1544                                          int ost_index, unsigned int ext_count,
1545                                          int current_extent)
1546 {
1547         char            *to;
1548         unsigned int    ext;
1549
1550         for (ext = 0; ext < ext_count; ext++) {
1551                 lcl_fm_ext[ext].fe_device = ost_index;
1552                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1553         }
1554
1555         /* Copy fm_extent's from fm_local to return buffer */
1556         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1557         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1558 }
1559
1560 #define FIEMAP_BUFFER_SIZE 4096
1561
1562 /**
1563  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1564  * call. The local end offset and the device are sent in the first
1565  * fm_extent. This function calculates the stripe number from the index.
1566  * This function returns a stripe_no on which mapping is to be restarted.
1567  *
1568  * This function returns fm_end_offset which is the in-OST offset at which
1569  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1570  * will re-calculate proper offset in next stripe.
1571  * Note that the first extent is passed to lov_get_info via the value field.
1572  *
1573  * \param fiemap [in]           fiemap request header
1574  * \param lsm [in]              striping information for the file
1575  * \param index [in]            stripe component index
1576  * \param ext [in]              logical extent of mapping
1577  * \param start_stripe [out]    starting stripe will be returned in this
1578  */
1579 static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1580                                      struct lov_stripe_md *lsm,
1581                                      int index, struct lu_extent *ext,
1582                                      int *start_stripe)
1583 {
1584         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1585         u64 local_end = fiemap->fm_extents[0].fe_logical;
1586         u64 lun_start;
1587         u64 lun_end;
1588         u64 fm_end_offset;
1589         int stripe_no = -1;
1590         int i;
1591
1592         if (fiemap->fm_extent_count == 0 ||
1593             fiemap->fm_extents[0].fe_logical == 0)
1594                 return 0;
1595
1596         /* Find out stripe_no from ost_index saved in the fe_device */
1597         for (i = 0; i < lsme->lsme_stripe_count; i++) {
1598                 struct lov_oinfo *oinfo = lsme->lsme_oinfo[i];
1599
1600                 if (lov_oinfo_is_dummy(oinfo))
1601                         continue;
1602
1603                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1604                         stripe_no = i;
1605                         break;
1606                 }
1607         }
1608
1609         if (stripe_no == -1)
1610                 return -EINVAL;
1611
1612         /* If we have finished mapping on previous device, shift logical
1613          * offset to start of next device */
1614         if (lov_stripe_intersects(lsm, index, stripe_no, ext,
1615                                    &lun_start, &lun_end) != 0 &&
1616             local_end < lun_end) {
1617                 fm_end_offset = local_end;
1618                 *start_stripe = stripe_no;
1619         } else {
1620                 /* This is a special value to indicate that caller should
1621                  * calculate offset in next stripe. */
1622                 fm_end_offset = 0;
1623                 *start_stripe = (stripe_no + 1) % lsme->lsme_stripe_count;
1624         }
1625
1626         return fm_end_offset;
1627 }
1628
1629 struct fiemap_state {
1630         struct fiemap           *fs_fm;
1631         struct lu_extent        fs_ext;
1632         u64                     fs_length;
1633         u64                     fs_end_offset;
1634         int                     fs_cur_extent;
1635         int                     fs_cnt_need;
1636         int                     fs_start_stripe;
1637         int                     fs_last_stripe;
1638         bool                    fs_device_done;
1639         bool                    fs_finish_stripe;
1640         bool                    fs_enough;
1641 };
1642
1643 static struct cl_object *lov_find_subobj(const struct lu_env *env,
1644                                          struct lov_object *lov,
1645                                          struct lov_stripe_md *lsm,
1646                                          int index)
1647 {
1648         struct lov_device       *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
1649         struct lov_thread_info  *lti = lov_env_info(env);
1650         struct lu_fid           *ofid = &lti->lti_fid;
1651         struct lov_oinfo        *oinfo;
1652         struct cl_device        *subdev;
1653         int                     entry = lov_comp_entry(index);
1654         int                     stripe = lov_comp_stripe(index);
1655         int                     ost_idx;
1656         int                     rc;
1657         struct cl_object        *result;
1658
1659         if (lov->lo_type != LLT_COMP)
1660                 GOTO(out, result = NULL);
1661
1662         if (entry >= lsm->lsm_entry_count ||
1663             stripe >= lsm->lsm_entries[entry]->lsme_stripe_count)
1664                 GOTO(out, result = NULL);
1665
1666         oinfo = lsm->lsm_entries[entry]->lsme_oinfo[stripe];
1667         ost_idx = oinfo->loi_ost_idx;
1668         rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
1669         if (rc != 0)
1670                 GOTO(out, result = NULL);
1671
1672         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
1673         result = lov_sub_find(env, subdev, ofid, NULL);
1674 out:
1675         if (result == NULL)
1676                 result = ERR_PTR(-EINVAL);
1677         return result;
1678 }
1679
1680 int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj,
1681                       struct lov_stripe_md *lsm, struct fiemap *fiemap,
1682                       size_t *buflen, struct ll_fiemap_info_key *fmkey,
1683                       int index, int stripeno, struct fiemap_state *fs)
1684 {
1685         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1686         struct cl_object *subobj;
1687         struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1688         struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0];
1689         u64 req_fm_len; /* Stores length of required mapping */
1690         u64 len_mapped_single_call;
1691         u64 lun_start;
1692         u64 lun_end;
1693         u64 obd_object_end;
1694         unsigned int ext_count;
1695         /* EOF for object */
1696         bool ost_eof = false;
1697         /* done with required mapping for this OST? */
1698         bool ost_done = false;
1699         int ost_index;
1700         int rc = 0;
1701
1702         fs->fs_device_done = false;
1703         /* Find out range of mapping on this stripe */
1704         if ((lov_stripe_intersects(lsm, index, stripeno, &fs->fs_ext,
1705                                    &lun_start, &obd_object_end)) == 0)
1706                 return 0;
1707
1708         if (lov_oinfo_is_dummy(lsme->lsme_oinfo[stripeno]))
1709                 return -EIO;
1710
1711         /* If this is a continuation FIEMAP call and we are on
1712          * starting stripe then lun_start needs to be set to
1713          * end_offset */
1714         if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe)
1715                 lun_start = fs->fs_end_offset;
1716         lun_end = lov_size_to_stripe(lsm, index, fs->fs_ext.e_end, stripeno);
1717         if (lun_start == lun_end)
1718                 return 0;
1719
1720         req_fm_len = obd_object_end - lun_start + 1;
1721         fs->fs_fm->fm_length = 0;
1722         len_mapped_single_call = 0;
1723
1724         /* find lobsub object */
1725         subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1726                                  lov_comp_index(index, stripeno));
1727         if (IS_ERR(subobj))
1728                 return PTR_ERR(subobj);
1729         /* If the output buffer is very large and the objects have many
1730          * extents we may need to loop on a single OST repeatedly */
1731         do {
1732                 if (fiemap->fm_extent_count > 0) {
1733                         /* Don't get too many extents. */
1734                         if (fs->fs_cur_extent + fs->fs_cnt_need >
1735                             fiemap->fm_extent_count)
1736                                 fs->fs_cnt_need = fiemap->fm_extent_count -
1737                                                   fs->fs_cur_extent;
1738                 }
1739
1740                 lun_start += len_mapped_single_call;
1741                 fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call;
1742                 req_fm_len = fs->fs_fm->fm_length;
1743                 /**
1744                  * If we've collected enough extent map, we'd request 1 more,
1745                  * to see whether we coincidentally finished all available
1746                  * extent map, so that FIEMAP_EXTENT_LAST would be set.
1747                  */
1748                 fs->fs_fm->fm_extent_count = fs->fs_enough ?
1749                                              1 : fs->fs_cnt_need;
1750                 fs->fs_fm->fm_mapped_extents = 0;
1751                 fs->fs_fm->fm_flags = fiemap->fm_flags;
1752
1753                 ost_index = lsme->lsme_oinfo[stripeno]->loi_ost_idx;
1754
1755                 if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count)
1756                         GOTO(obj_put, rc = -EINVAL);
1757                 /* If OST is inactive, return extent with UNKNOWN flag. */
1758                 if (!lov->lov_tgts[ost_index]->ltd_active) {
1759                         fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST;
1760                         fs->fs_fm->fm_mapped_extents = 1;
1761
1762                         fm_ext[0].fe_logical = lun_start;
1763                         fm_ext[0].fe_length = obd_object_end - lun_start + 1;
1764                         fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1765
1766                         goto inactive_tgt;
1767                 }
1768
1769                 fs->fs_fm->fm_start = lun_start;
1770                 fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1771                 memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm));
1772                 *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count);
1773
1774                 rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen);
1775                 if (rc != 0)
1776                         GOTO(obj_put, rc);
1777 inactive_tgt:
1778                 ext_count = fs->fs_fm->fm_mapped_extents;
1779                 if (ext_count == 0) {
1780                         ost_done = true;
1781                         fs->fs_device_done = true;
1782                         /* If last stripe has hold at the end,
1783                          * we need to return */
1784                         if (stripeno == fs->fs_last_stripe) {
1785                                 fiemap->fm_mapped_extents = 0;
1786                                 fs->fs_finish_stripe = true;
1787                                 GOTO(obj_put, rc);
1788                         }
1789                         break;
1790                 } else if (fs->fs_enough) {
1791                         /*
1792                          * We've collected enough extents and there are
1793                          * more extents after it.
1794                          */
1795                         GOTO(obj_put, rc);
1796                 }
1797
1798                 /* If we just need num of extents, got to next device */
1799                 if (fiemap->fm_extent_count == 0) {
1800                         fs->fs_cur_extent += ext_count;
1801                         break;
1802                 }
1803
1804                 /* prepare to copy retrived map extents */
1805                 len_mapped_single_call = fm_ext[ext_count - 1].fe_logical +
1806                                          fm_ext[ext_count - 1].fe_length -
1807                                          lun_start;
1808
1809                 /* Have we finished mapping on this device? */
1810                 if (req_fm_len <= len_mapped_single_call) {
1811                         ost_done = true;
1812                         fs->fs_device_done = true;
1813                 }
1814
1815                 /* Clear the EXTENT_LAST flag which can be present on
1816                  * the last extent */
1817                 if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST)
1818                         fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST;
1819                 if (lov_stripe_size(lsm, index,
1820                                     fm_ext[ext_count - 1].fe_logical +
1821                                     fm_ext[ext_count - 1].fe_length,
1822                                     stripeno) >= fmkey->lfik_oa.o_size) {
1823                         ost_eof = true;
1824                         fs->fs_device_done = true;
1825                 }
1826
1827                 fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index,
1828                                              ext_count, fs->fs_cur_extent);
1829                 fs->fs_cur_extent += ext_count;
1830
1831                 /* Ran out of available extents? */
1832                 if (fs->fs_cur_extent >= fiemap->fm_extent_count)
1833                         fs->fs_enough = true;
1834         } while (!ost_done && !ost_eof);
1835
1836         if (stripeno == fs->fs_last_stripe)
1837                 fs->fs_finish_stripe = true;
1838 obj_put:
1839         cl_object_put(env, subobj);
1840
1841         return rc;
1842 }
1843
1844 /**
1845  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1846  * This also handles the restarting of FIEMAP calls in case mapping overflows
1847  * the available number of extents in single call.
1848  *
1849  * \param env [in]              lustre environment
1850  * \param obj [in]              file object
1851  * \param fmkey [in]            fiemap request header and other info
1852  * \param fiemap [out]          fiemap buffer holding retrived map extents
1853  * \param buflen [in/out]       max buffer length of @fiemap, when iterate
1854  *                              each OST, it is used to limit max map needed
1855  * \retval 0    success
1856  * \retval < 0  error
1857  */
1858 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1859                              struct ll_fiemap_info_key *fmkey,
1860                              struct fiemap *fiemap, size_t *buflen)
1861 {
1862         struct lov_stripe_md_entry *lsme;
1863         struct lov_stripe_md *lsm;
1864         struct fiemap *fm_local = NULL;
1865         loff_t whole_start;
1866         loff_t whole_end;
1867         int entry;
1868         int start_entry;
1869         int end_entry;
1870         int cur_stripe = 0;
1871         int stripe_count;
1872         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1873         int rc = 0;
1874         struct fiemap_state fs = { 0 };
1875         ENTRY;
1876
1877         lsm = lov_lsm_addref(cl2lov(obj));
1878         if (lsm == NULL) {
1879                 /* no extent: there is no object for mapping */
1880                 fiemap->fm_mapped_extents = 0;
1881                 return 0;
1882         }
1883
1884         if (!(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
1885                 /**
1886                  * If the entry count > 1 or stripe_count > 1 and the
1887                  * application does not understand DEVICE_ORDER flag,
1888                  * it cannot interpret the extents correctly.
1889                  */
1890                 if (lsm->lsm_entry_count > 1 ||
1891                     (lsm->lsm_entry_count == 1 &&
1892                      lsm->lsm_entries[0]->lsme_stripe_count > 1))
1893                         GOTO(out_lsm, rc = -ENOTSUPP);
1894         }
1895
1896         /* No support for DOM layout yet. */
1897         if (lsme_is_dom(lsm->lsm_entries[0]))
1898                 GOTO(out_lsm, rc = -ENOTSUPP);
1899
1900         if (lsm->lsm_is_released) {
1901                 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1902                         /**
1903                          * released file, return a minimal FIEMAP if
1904                          * request fits in file-size.
1905                          */
1906                         fiemap->fm_mapped_extents = 1;
1907                         fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1908                         if (fiemap->fm_start + fiemap->fm_length <
1909                             fmkey->lfik_oa.o_size)
1910                                 fiemap->fm_extents[0].fe_length =
1911                                         fiemap->fm_length;
1912                         else
1913                                 fiemap->fm_extents[0].fe_length =
1914                                         fmkey->lfik_oa.o_size -
1915                                         fiemap->fm_start;
1916                         fiemap->fm_extents[0].fe_flags |=
1917                                 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1918                 }
1919                 GOTO(out_lsm, rc = 0);
1920         }
1921
1922         /* buffer_size is small to hold fm_extent_count of extents. */
1923         if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1924                 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1925
1926         OBD_ALLOC_LARGE(fm_local, buffer_size);
1927         if (fm_local == NULL)
1928                 GOTO(out_lsm, rc = -ENOMEM);
1929
1930         /**
1931          * Requested extent count exceeds the fiemap buffer size, shrink our
1932          * ambition.
1933          */
1934         if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1935                 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1936         if (fiemap->fm_extent_count == 0)
1937                 fs.fs_cnt_need = 0;
1938
1939         fs.fs_enough = false;
1940         fs.fs_cur_extent = 0;
1941         fs.fs_fm = fm_local;
1942         fs.fs_cnt_need = fiemap_size_to_count(buffer_size);
1943
1944         whole_start = fiemap->fm_start;
1945         /* whole_start is beyond the end of the file */
1946         if (whole_start > fmkey->lfik_oa.o_size)
1947                 GOTO(out_fm_local, rc = -EINVAL);
1948         whole_end = (fiemap->fm_length == OBD_OBJECT_EOF) ?
1949                                         fmkey->lfik_oa.o_size :
1950                                         whole_start + fiemap->fm_length - 1;
1951         /**
1952          * If fiemap->fm_length != OBD_OBJECT_EOF but whole_end exceeds file
1953          * size
1954          */
1955         if (whole_end > fmkey->lfik_oa.o_size)
1956                 whole_end = fmkey->lfik_oa.o_size;
1957
1958         start_entry = lov_lsm_entry(lsm, whole_start);
1959         end_entry = lov_lsm_entry(lsm, whole_end);
1960         if (end_entry == -1)
1961                 end_entry = lsm->lsm_entry_count - 1;
1962
1963         if (start_entry == -1 || end_entry == -1)
1964                 GOTO(out_fm_local, rc = -EINVAL);
1965
1966         /* TODO: rewrite it with lov_foreach_io_layout() */
1967         for (entry = start_entry; entry <= end_entry; entry++) {
1968                 lsme = lsm->lsm_entries[entry];
1969
1970                 if (!lsme_inited(lsme))
1971                         break;
1972
1973                 if (entry == start_entry)
1974                         fs.fs_ext.e_start = whole_start;
1975                 else
1976                         fs.fs_ext.e_start = lsme->lsme_extent.e_start;
1977                 if (entry == end_entry)
1978                         fs.fs_ext.e_end = whole_end;
1979                 else
1980                         fs.fs_ext.e_end = lsme->lsme_extent.e_end - 1;
1981                 fs.fs_length = fs.fs_ext.e_end - fs.fs_ext.e_start + 1;
1982
1983                 /* Calculate start stripe, last stripe and length of mapping */
1984                 fs.fs_start_stripe = lov_stripe_number(lsm, entry,
1985                                                        fs.fs_ext.e_start);
1986                 fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, entry,
1987                                         &fs.fs_ext, fs.fs_start_stripe,
1988                                         &stripe_count);
1989                 fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, entry,
1990                                         &fs.fs_ext, &fs.fs_start_stripe);
1991                 /* Check each stripe */
1992                 for (cur_stripe = fs.fs_start_stripe; stripe_count > 0;
1993                      --stripe_count,
1994                      cur_stripe = (cur_stripe + 1) % lsme->lsme_stripe_count) {
1995                         rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen,
1996                                                fmkey, entry, cur_stripe, &fs);
1997                         if (rc < 0)
1998                                 GOTO(out_fm_local, rc);
1999                         if (fs.fs_enough)
2000                                 GOTO(finish, rc);
2001                         if (fs.fs_finish_stripe)
2002                                 break;
2003                 } /* for each stripe */
2004         } /* for covering layout component */
2005         /*
2006          * We've traversed all components, set @entry to the last component
2007          * entry, it's for the last stripe check.
2008          */
2009         entry--;
2010 finish:
2011         /* Indicate that we are returning device offsets unless file just has
2012          * single stripe */
2013         if (lsm->lsm_entry_count > 1 ||
2014             (lsm->lsm_entry_count == 1 &&
2015              lsm->lsm_entries[0]->lsme_stripe_count > 1))
2016                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
2017
2018         if (fiemap->fm_extent_count == 0)
2019                 goto skip_last_device_calc;
2020
2021         /* Check if we have reached the last stripe and whether mapping for that
2022          * stripe is done. */
2023         if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done)
2024                 fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |=
2025                                                              FIEMAP_EXTENT_LAST;
2026 skip_last_device_calc:
2027         fiemap->fm_mapped_extents = fs.fs_cur_extent;
2028 out_fm_local:
2029         OBD_FREE_LARGE(fm_local, buffer_size);
2030
2031 out_lsm:
2032         lov_lsm_put(lsm);
2033         return rc;
2034 }
2035
2036 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
2037                                 struct lov_user_md __user *lum, size_t size)
2038 {
2039         struct lov_object       *lov = cl2lov(obj);
2040         struct lov_stripe_md    *lsm;
2041         int                     rc = 0;
2042         ENTRY;
2043
2044         lsm = lov_lsm_addref(lov);
2045         if (lsm == NULL)
2046                 RETURN(-ENODATA);
2047
2048         rc = lov_getstripe(env, cl2lov(obj), lsm, lum, size);
2049         lov_lsm_put(lsm);
2050         RETURN(rc);
2051 }
2052
2053 static int lov_object_layout_get(const struct lu_env *env,
2054                                  struct cl_object *obj,
2055                                  struct cl_layout *cl)
2056 {
2057         struct lov_object *lov = cl2lov(obj);
2058         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2059         struct lu_buf *buf = &cl->cl_buf;
2060         ssize_t rc;
2061         ENTRY;
2062
2063         if (lsm == NULL) {
2064                 cl->cl_size = 0;
2065                 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
2066
2067                 RETURN(0);
2068         }
2069
2070         cl->cl_size = lov_comp_md_size(lsm);
2071         cl->cl_layout_gen = lsm->lsm_layout_gen;
2072         cl->cl_is_released = lsm->lsm_is_released;
2073         cl->cl_is_composite = lsm_is_composite(lsm->lsm_magic);
2074
2075         rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
2076         lov_lsm_put(lsm);
2077
2078         RETURN(rc < 0 ? rc : 0);
2079 }
2080
2081 static loff_t lov_object_maxbytes(struct cl_object *obj)
2082 {
2083         struct lov_object *lov = cl2lov(obj);
2084         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2085         loff_t maxbytes;
2086
2087         if (lsm == NULL)
2088                 return LLONG_MAX;
2089
2090         maxbytes = lsm->lsm_maxbytes;
2091
2092         lov_lsm_put(lsm);
2093
2094         return maxbytes;
2095 }
2096
2097 static int lov_object_flush(const struct lu_env *env, struct cl_object *obj,
2098                             struct ldlm_lock *lock)
2099 {
2100         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_flush, true, env, obj,
2101                                      lock);
2102 }
2103
2104 static const struct cl_object_operations lov_ops = {
2105         .coo_page_init    = lov_page_init,
2106         .coo_lock_init    = lov_lock_init,
2107         .coo_io_init      = lov_io_init,
2108         .coo_attr_get     = lov_attr_get,
2109         .coo_attr_update  = lov_attr_update,
2110         .coo_conf_set     = lov_conf_set,
2111         .coo_getstripe    = lov_object_getstripe,
2112         .coo_layout_get   = lov_object_layout_get,
2113         .coo_maxbytes     = lov_object_maxbytes,
2114         .coo_fiemap       = lov_object_fiemap,
2115         .coo_object_flush = lov_object_flush
2116 };
2117
2118 static const struct lu_object_operations lov_lu_obj_ops = {
2119         .loo_object_init      = lov_object_init,
2120         .loo_object_delete    = lov_object_delete,
2121         .loo_object_release   = NULL,
2122         .loo_object_free      = lov_object_free,
2123         .loo_object_print     = lov_object_print,
2124         .loo_object_invariant = NULL
2125 };
2126
2127 struct lu_object *lov_object_alloc(const struct lu_env *env,
2128                                    const struct lu_object_header *unused,
2129                                    struct lu_device *dev)
2130 {
2131         struct lov_object *lov;
2132         struct lu_object  *obj;
2133
2134         ENTRY;
2135         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
2136         if (lov != NULL) {
2137                 obj = lov2lu(lov);
2138                 lu_object_init(obj, NULL, dev);
2139                 lov->lo_cl.co_ops = &lov_ops;
2140                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
2141                 /*
2142                  * object io operation vector (cl_object::co_iop) is installed
2143                  * later in lov_object_init(), as different vectors are used
2144                  * for object with different layouts.
2145                  */
2146                 obj->lo_ops = &lov_lu_obj_ops;
2147         } else
2148                 obj = NULL;
2149         RETURN(obj);
2150 }
2151
2152 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
2153 {
2154         struct lov_stripe_md *lsm = NULL;
2155
2156         lov_conf_freeze(lov);
2157         if (lov->lo_lsm != NULL) {
2158                 lsm = lsm_addref(lov->lo_lsm);
2159                 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
2160                         lsm, atomic_read(&lsm->lsm_refc),
2161                         lov->lo_layout_invalid, current);
2162         }
2163         lov_conf_thaw(lov);
2164         return lsm;
2165 }
2166
2167 int lov_read_and_clear_async_rc(struct cl_object *clob)
2168 {
2169         struct lu_object *luobj;
2170         int rc = 0;
2171         ENTRY;
2172
2173         luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
2174                                  &lov_device_type);
2175         if (luobj != NULL) {
2176                 struct lov_object *lov = lu2lov(luobj);
2177
2178                 lov_conf_freeze(lov);
2179                 switch (lov->lo_type) {
2180                 case LLT_COMP: {
2181                         struct lov_stripe_md *lsm;
2182                         int i;
2183
2184                         lsm = lov->lo_lsm;
2185                         LASSERT(lsm != NULL);
2186                         for (i = 0; i < lsm->lsm_entry_count; i++) {
2187                                 struct lov_stripe_md_entry *lse =
2188                                                 lsm->lsm_entries[i];
2189                                 int j;
2190
2191                                 if (!lsme_inited(lse))
2192                                         break;
2193
2194                                 for (j = 0; j < lse->lsme_stripe_count; j++) {
2195                                         struct lov_oinfo *loi =
2196                                                         lse->lsme_oinfo[j];
2197
2198                                         if (lov_oinfo_is_dummy(loi))
2199                                                 continue;
2200
2201                                         if (loi->loi_ar.ar_rc && !rc)
2202                                                 rc = loi->loi_ar.ar_rc;
2203                                         loi->loi_ar.ar_rc = 0;
2204                                 }
2205                         }
2206                 }
2207                 case LLT_RELEASED:
2208                 case LLT_EMPTY:
2209                         /* fall through */
2210                 case LLT_FOREIGN:
2211                         break;
2212                 default:
2213                         LBUG();
2214                 }
2215                 lov_conf_thaw(lov);
2216         }
2217         RETURN(rc);
2218 }
2219 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
2220
2221 /** @} lov */