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 };
  80
  81 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
  82
  83 static void lov_lsm_put(struct lov_stripe_md *lsm)
  84 {
  85         if (lsm != NULL)
  86                 lov_free_memmd(&lsm);
  87 }
  88
  89 /*****************************************************************************
  90  *
  91  * Lov object layout operations.
  92  *
  93  */
  94
  95 static struct cl_object *lov_sub_find(const struct lu_env *env,
  96                                       struct cl_device *dev,
  97                                       const struct lu_fid *fid,
  98                                       const struct cl_object_conf *conf)
  99 {
 100         struct lu_object *o;
 101
 102         ENTRY;
 103
 104         o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
 105         LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
 106         RETURN(lu2cl(o));
 107 }
 108
 109 static int lov_page_slice_fixup(struct lov_object *lov,
 110                                 struct cl_object *stripe)
 111 {
 112         struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
 113         struct cl_object *o;
 114
 115         if (stripe == NULL)
 116                 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
 117                        cfs_size_round(sizeof(struct lov_page));
 118
 119         cl_object_for_each(o, stripe)
 120                 o->co_slice_off += hdr->coh_page_bufsize;
 121
 122         return cl_object_header(stripe)->coh_page_bufsize;
 123 }
 124
 125 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
 126                         struct cl_object *subobj, struct lov_oinfo *oinfo,
 127                         int idx)
 128 {
 129         struct cl_object_header *hdr;
 130         struct cl_object_header *subhdr;
 131         struct cl_object_header *parent;
 132         int entry = lov_comp_entry(idx);
 133         int stripe = lov_comp_stripe(idx);
 134         int result;
 135
 136         if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
 137                 /* For sanity:test_206.
 138                  * Do not leave the object in cache to avoid accessing
 139                  * freed memory. This is because osc_object is referring to
 140                  * lov_oinfo of lsm_stripe_data which will be freed due to
 141                  * this failure. */
 142                 cl_object_kill(env, subobj);
 143                 cl_object_put(env, subobj);
 144                 return -EIO;
 145         }
 146
 147         hdr = cl_object_header(lov2cl(lov));
 148         subhdr = cl_object_header(subobj);
 149
 150         CDEBUG(D_INODE, DFID"@%p[%d:%d] -> "DFID"@%p: ostid: "DOSTID
 151                " ost idx: %d gen: %d\n",
 152                PFID(lu_object_fid(&subobj->co_lu)), subhdr, entry, stripe,
 153                PFID(lu_object_fid(lov2lu(lov))), hdr, POSTID(&oinfo->loi_oi),
 154                oinfo->loi_ost_idx, oinfo->loi_ost_gen);
 155
 156         /* reuse ->coh_attr_guard to protect coh_parent change */
 157         spin_lock(&subhdr->coh_attr_guard);
 158         parent = subhdr->coh_parent;
 159         if (parent == NULL) {
 160                 struct lovsub_object *lso = cl2lovsub(subobj);
 161
 162                 subhdr->coh_parent = hdr;
 163                 spin_unlock(&subhdr->coh_attr_guard);
 164                 subhdr->coh_nesting = hdr->coh_nesting + 1;
 165                 lu_object_ref_add(&subobj->co_lu, "lov-parent", lov);
 166                 lso->lso_super = lov;
 167                 lso->lso_index = idx;
 168                 result = 0;
 169         } else {
 170                 struct lu_object  *old_obj;
 171                 struct lov_object *old_lov;
 172                 unsigned int mask = D_INODE;
 173
 174                 spin_unlock(&subhdr->coh_attr_guard);
 175                 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
 176                 LASSERT(old_obj != NULL);
 177                 old_lov = cl2lov(lu2cl(old_obj));
 178                 if (old_lov->lo_layout_invalid) {
 179                         /* the object's layout has already changed but isn't
 180                          * refreshed */
 181                         lu_object_unhash(env, &subobj->co_lu);
 182                         result = -EAGAIN;
 183                 } else {
 184                         mask = D_ERROR;
 185                         result = -EIO;
 186                 }
 187
 188                 LU_OBJECT_DEBUG(mask, env, &subobj->co_lu,
 189                                 "stripe %d is already owned.", idx);
 190                 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.");
 191                 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
 192                 cl_object_put(env, subobj);
 193         }
 194         return result;
 195 }
 196
 197 static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
 198                           struct lov_object *lov, unsigned int index,
 199                           const struct cl_object_conf *conf,
 200                           struct lov_layout_entry *lle)
 201 {
 202         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 203         struct lov_thread_info *lti = lov_env_info(env);
 204         struct cl_object_conf *subconf = &lti->lti_stripe_conf;
 205         struct lu_fid *ofid = &lti->lti_fid;
 206         struct cl_object *stripe;
 207         struct lov_stripe_md_entry *lse  = lov_lse(lov, index);
 208         int result;
 209         int psz, sz;
 210         int i;
 211
 212         ENTRY;
 213
 214         spin_lock_init(&r0->lo_sub_lock);
 215         r0->lo_nr = lse->lsme_stripe_count;
 216         LASSERT(r0->lo_nr <= lov_targets_nr(dev));
 217
 218         OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 219         if (r0->lo_sub == NULL)
 220                 GOTO(out, result = -ENOMEM);
 221
 222         psz = 0;
 223         result = 0;
 224         memset(subconf, 0, sizeof(*subconf));
 225
 226         /*
 227          * Create stripe cl_objects.
 228          */
 229         for (i = 0; i < r0->lo_nr; ++i) {
 230                 struct cl_device *subdev;
 231                 struct lov_oinfo *oinfo = lse->lsme_oinfo[i];
 232                 int ost_idx = oinfo->loi_ost_idx;
 233
 234                 if (lov_oinfo_is_dummy(oinfo))
 235                         continue;
 236
 237                 result = ostid_to_fid(ofid, &oinfo->loi_oi, oinfo->loi_ost_idx);
 238                 if (result != 0)
 239                         GOTO(out, result);
 240
 241                 if (dev->ld_target[ost_idx] == NULL) {
 242                         CERROR("%s: OST %04x is not initialized\n",
 243                                lov2obd(dev->ld_lov)->obd_name, ost_idx);
 244                         GOTO(out, result = -EIO);
 245                 }
 246
 247                 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 248                 subconf->u.coc_oinfo = oinfo;
 249                 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 250                 /* In the function below, .hs_keycmp resolves to
 251                  * lu_obj_hop_keycmp() */
 252                 /* coverity[overrun-buffer-val] */
 253                 stripe = lov_sub_find(env, subdev, ofid, subconf);
 254                 if (IS_ERR(stripe))
 255                         GOTO(out, result = PTR_ERR(stripe));
 256
 257                 result = lov_init_sub(env, lov, stripe, oinfo,
 258                                       lov_comp_index(index, i));
 259                 if (result == -EAGAIN) { /* try again */
 260                         --i;
 261                         result = 0;
 262                         continue;
 263                 }
 264
 265                 if (result == 0) {
 266                         r0->lo_sub[i] = cl2lovsub(stripe);
 267
 268                         sz = lov_page_slice_fixup(lov, stripe);
 269                         LASSERT(ergo(psz > 0, psz == sz));
 270                         psz = sz;
 271                 }
 272         }
 273         if (result == 0)
 274                 result = psz;
 275 out:
 276         RETURN(result);
 277 }
 278
 279 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 280                                struct lov_layout_raid0 *r0,
 281                                struct lovsub_object *los, int idx)
 282 {
 283         struct cl_object        *sub;
 284         struct lu_site          *site;
 285         struct lu_site_bkt_data *bkt;
 286         wait_queue_entry_t *waiter;
 287
 288         LASSERT(r0->lo_sub[idx] == los);
 289
 290         sub  = lovsub2cl(los);
 291         site = sub->co_lu.lo_dev->ld_site;
 292         bkt  = lu_site_bkt_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         if (r0->lo_sub[idx] == los) {
 302                 waiter = &lov_env_info(env)->lti_waiter;
 303                 init_waitqueue_entry(waiter, current);
 304                 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
 305                 set_current_state(TASK_UNINTERRUPTIBLE);
 306                 while (1) {
 307                         /* this wait-queue is signaled at the end of
 308                          * lu_object_free(). */
 309                         set_current_state(TASK_UNINTERRUPTIBLE);
 310                         spin_lock(&r0->lo_sub_lock);
 311                         if (r0->lo_sub[idx] == los) {
 312                                 spin_unlock(&r0->lo_sub_lock);
 313                                 schedule();
 314                         } else {
 315                                 spin_unlock(&r0->lo_sub_lock);
 316                                 set_current_state(TASK_RUNNING);
 317                                 break;
 318                         }
 319                 }
 320                 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
 321         }
 322         LASSERT(r0->lo_sub[idx] == NULL);
 323 }
 324
 325 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 326                              struct lov_layout_entry *lle)
 327 {
 328         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 329
 330         ENTRY;
 331
 332         if (r0->lo_sub != NULL) {
 333                 int i;
 334
 335                 for (i = 0; i < r0->lo_nr; ++i) {
 336                         struct lovsub_object *los = r0->lo_sub[i];
 337
 338                         if (los != NULL) {
 339                                 cl_object_prune(env, &los->lso_cl);
 340                                 /*
 341                                  * If top-level object is to be evicted from
 342                                  * the cache, so are its sub-objects.
 343                                  */
 344                                 lov_subobject_kill(env, lov, r0, los, i);
 345                         }
 346                 }
 347         }
 348
 349         EXIT;
 350 }
 351
 352 static void lov_fini_raid0(const struct lu_env *env,
 353                            struct lov_layout_entry *lle)
 354 {
 355         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 356
 357         if (r0->lo_sub != NULL) {
 358                 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 359                 r0->lo_sub = NULL;
 360         }
 361 }
 362
 363 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 364                            lu_printer_t p, const struct lov_layout_entry *lle)
 365 {
 366         const struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 367         int i;
 368
 369         for (i = 0; i < r0->lo_nr; ++i) {
 370                 struct lu_object *sub;
 371
 372                 if (r0->lo_sub[i] != NULL) {
 373                         sub = lovsub2lu(r0->lo_sub[i]);
 374                         lu_object_print(env, cookie, p, sub);
 375                 } else {
 376                         (*p)(env, cookie, "sub %d absent\n", i);
 377                 }
 378         }
 379         return 0;
 380 }
 381
 382 static int lov_attr_get_raid0(const struct lu_env *env, struct lov_object *lov,
 383                               unsigned int index, struct lov_layout_entry *lle,
 384                               struct cl_attr **lov_attr)
 385 {
 386         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 387         struct lov_stripe_md *lsm = lov->lo_lsm;
 388         struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
 389         struct cl_attr *attr = &r0->lo_attr;
 390         __u64 kms = 0;
 391         int result = 0;
 392
 393         if (r0->lo_attr_valid) {
 394                 *lov_attr = attr;
 395                 return 0;
 396         }
 397
 398         memset(lvb, 0, sizeof(*lvb));
 399
 400         /* XXX: timestamps can be negative by sanity:test_39m,
 401          * how can it be? */
 402         lvb->lvb_atime = LLONG_MIN;
 403         lvb->lvb_ctime = LLONG_MIN;
 404         lvb->lvb_mtime = LLONG_MIN;
 405
 406         /*
 407          * XXX that should be replaced with a loop over sub-objects,
 408          * doing cl_object_attr_get() on them. But for now, let's
 409          * reuse old lov code.
 410          */
 411
 412         /*
 413          * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 414          * happy. It's not needed, because new code uses
 415          * ->coh_attr_guard spin-lock to protect consistency of
 416          * sub-object attributes.
 417          */
 418         lov_stripe_lock(lsm);
 419         result = lov_merge_lvb_kms(lsm, index, lvb, &kms);
 420         lov_stripe_unlock(lsm);
 421         if (result == 0) {
 422                 cl_lvb2attr(attr, lvb);
 423                 attr->cat_kms = kms;
 424                 r0->lo_attr_valid = 1;
 425                 *lov_attr = attr;
 426         }
 427
 428         return result;
 429 }
 430
 431 static struct lov_comp_layout_entry_ops raid0_ops = {
 432         .lco_init      = lov_init_raid0,
 433         .lco_fini      = lov_fini_raid0,
 434         .lco_getattr   = lov_attr_get_raid0,
 435 };
 436
 437 static int lov_attr_get_dom(const struct lu_env *env, struct lov_object *lov,
 438                             unsigned int index, struct lov_layout_entry *lle,
 439                             struct cl_attr **lov_attr)
 440 {
 441         struct lov_layout_dom *dom = &lle->lle_dom;
 442         struct lov_oinfo *loi = dom->lo_loi;
 443         struct cl_attr *attr = &dom->lo_dom_r0.lo_attr;
 444
 445         if (dom->lo_dom_r0.lo_attr_valid) {
 446                 *lov_attr = attr;
 447                 return 0;
 448         }
 449
 450         if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks))
 451                 return OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
 452
 453         cl_lvb2attr(attr, &loi->loi_lvb);
 454
 455         /* DoM component size can be bigger than stripe size after
 456          * client's setattr RPC, so do not count anything beyond
 457          * component end. Alternatively, check that limit on server
 458          * and do not allow size overflow there. */
 459         if (attr->cat_size > lle->lle_extent->e_end)
 460                 attr->cat_size = lle->lle_extent->e_end;
 461
 462         attr->cat_kms = attr->cat_size;
 463
 464         dom->lo_dom_r0.lo_attr_valid = 1;
 465         *lov_attr = attr;
 466
 467         return 0;
 468 }
 469
 470 /**
 471  * Lookup FLD to get MDS index of the given DOM object FID.
 472  *
 473  * \param[in]  ld       LOV device
 474  * \param[in]  fid      FID to lookup
 475  * \param[out] nr       index in MDC array to return back
 476  *
 477  * \retval              0 and \a mds filled with MDS index if successful
 478  * \retval              negative value on error
 479  */
 480 static int lov_fld_lookup(struct lov_device *ld, const struct lu_fid *fid,
 481                           __u32 *nr)
 482 {
 483         __u32 mds_idx;
 484         int i, rc;
 485
 486         ENTRY;
 487
 488         rc = fld_client_lookup(&ld->ld_lmv->u.lmv.lmv_fld, fid_seq(fid),
 489                                &mds_idx, LU_SEQ_RANGE_MDT, NULL);
 490         if (rc) {
 491                 CERROR("%s: error while looking for mds number. Seq %#llx"
 492                        ", err = %d\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 493                        fid_seq(fid), rc);
 494                 RETURN(rc);
 495         }
 496
 497         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
 498                mds_idx, PFID(fid));
 499
 500         /* find proper MDC device in the array */
 501         for (i = 0; i < ld->ld_md_tgts_nr; i++) {
 502                 if (ld->ld_md_tgts[i].ldm_mdc != NULL &&
 503                     ld->ld_md_tgts[i].ldm_idx == mds_idx)
 504                         break;
 505         }
 506
 507         if (i == ld->ld_md_tgts_nr) {
 508                 CERROR("%s: cannot find corresponding MDC device for mds #%x "
 509                        "for fid="DFID"\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 510                        mds_idx, PFID(fid));
 511                 rc = -EINVAL;
 512         } else {
 513                 *nr = i;
 514         }
 515         RETURN(rc);
 516 }
 517
 518 /**
 519  * Implementation of lov_comp_layout_entry_ops::lco_init for DOM object.
 520  *
 521  * Init the DOM object for the first time. It prepares also RAID0 entry
 522  * for it to use in common methods with ordinary RAID0 layout entries.
 523  *
 524  * \param[in] env       execution environment
 525  * \param[in] dev       LOV device
 526  * \param[in] lov       LOV object
 527  * \param[in] index     Composite layout entry index in LSM
 528  * \param[in] lle       Composite LOV layout entry
 529  */
 530 static int lov_init_dom(const struct lu_env *env, struct lov_device *dev,
 531                         struct lov_object *lov, unsigned int index,
 532                         const struct cl_object_conf *conf,
 533                         struct lov_layout_entry *lle)
 534 {
 535         struct lov_thread_info *lti = lov_env_info(env);
 536         struct lov_stripe_md_entry *lsme = lov_lse(lov, index);
 537         struct cl_object *clo;
 538         struct lu_object *o = lov2lu(lov);
 539         const struct lu_fid *fid = lu_object_fid(o);
 540         struct cl_device *mdcdev;
 541         struct lov_oinfo *loi = NULL;
 542         struct cl_object_conf *sconf = &lti->lti_stripe_conf;
 543
 544         int rc;
 545         __u32 idx = 0;
 546
 547         ENTRY;
 548
 549         LASSERT(index == 0);
 550
 551         /* find proper MDS device */
 552         rc = lov_fld_lookup(dev, fid, &idx);
 553         if (rc)
 554                 RETURN(rc);
 555
 556         LASSERTF(dev->ld_md_tgts[idx].ldm_mdc != NULL,
 557                  "LOV md target[%u] is NULL\n", idx);
 558
 559         /* check lsm is DOM, more checks are needed */
 560         LASSERT(lsme->lsme_stripe_count == 0);
 561
 562         /*
 563          * Create lower cl_objects.
 564          */
 565         mdcdev = dev->ld_md_tgts[idx].ldm_mdc;
 566
 567         LASSERTF(mdcdev != NULL, "non-initialized mdc subdev\n");
 568
 569         /* DoM object has no oinfo in LSM entry, create it exclusively */
 570         OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 571         if (loi == NULL)
 572                 RETURN(-ENOMEM);
 573
 574         fid_to_ostid(lu_object_fid(lov2lu(lov)), &loi->loi_oi);
 575
 576         sconf->u.coc_oinfo = loi;
 577 again:
 578         clo = lov_sub_find(env, mdcdev, fid, sconf);
 579         if (IS_ERR(clo))
 580                 GOTO(out, rc = PTR_ERR(clo));
 581
 582         rc = lov_init_sub(env, lov, clo, loi, lov_comp_index(index, 0));
 583         if (rc == -EAGAIN) /* try again */
 584                 goto again;
 585         else if (rc != 0)
 586                 GOTO(out, rc);
 587
 588         lle->lle_dom.lo_dom = cl2lovsub(clo);
 589         spin_lock_init(&lle->lle_dom.lo_dom_r0.lo_sub_lock);
 590         lle->lle_dom.lo_dom_r0.lo_nr = 1;
 591         lle->lle_dom.lo_dom_r0.lo_sub = &lle->lle_dom.lo_dom;
 592         lle->lle_dom.lo_loi = loi;
 593
 594         rc = lov_page_slice_fixup(lov, clo);
 595         RETURN(rc);
 596
 597 out:
 598         if (loi != NULL)
 599                 OBD_SLAB_FREE_PTR(loi, lov_oinfo_slab);
 600         return rc;
 601 }
 602
 603 /**
 604  * Implementation of lov_layout_operations::llo_fini for DOM object.
 605  *
 606  * Finish the DOM object and free related memory.
 607  *
 608  * \param[in] env       execution environment
 609  * \param[in] lov       LOV object
 610  * \param[in] state     LOV layout state
 611  */
 612 static void lov_fini_dom(const struct lu_env *env,
 613                          struct lov_layout_entry *lle)
 614 {
 615         if (lle->lle_dom.lo_dom != NULL)
 616                 lle->lle_dom.lo_dom = NULL;
 617         if (lle->lle_dom.lo_loi != NULL)
 618                 OBD_SLAB_FREE_PTR(lle->lle_dom.lo_loi, lov_oinfo_slab);
 619 }
 620
 621 static struct lov_comp_layout_entry_ops dom_ops = {
 622         .lco_init = lov_init_dom,
 623         .lco_fini = lov_fini_dom,
 624         .lco_getattr = lov_attr_get_dom,
 625 };
 626
 627 static int lov_init_composite(const struct lu_env *env, struct lov_device *dev,
 628                               struct lov_object *lov, struct lov_stripe_md *lsm,
 629                               const struct cl_object_conf *conf,
 630                               union lov_layout_state *state)
 631 {
 632         struct lov_layout_composite *comp = &state->composite;
 633         struct lov_layout_entry *lle;
 634         struct lov_mirror_entry *lre;
 635         unsigned int entry_count;
 636         unsigned int psz = 0;
 637         unsigned int mirror_count;
 638         int flr_state = lsm->lsm_flags & LCM_FL_FLR_MASK;
 639         int result = 0;
 640         unsigned int seq;
 641         int i, j;
 642
 643         ENTRY;
 644
 645         LASSERT(lsm->lsm_entry_count > 0);
 646         LASSERT(lov->lo_lsm == NULL);
 647         lov->lo_lsm = lsm_addref(lsm);
 648         lov->lo_layout_invalid = true;
 649
 650         dump_lsm(D_INODE, lsm);
 651
 652         entry_count = lsm->lsm_entry_count;
 653
 654         spin_lock_init(&comp->lo_write_lock);
 655         comp->lo_flags = lsm->lsm_flags;
 656         comp->lo_mirror_count = lsm->lsm_mirror_count + 1;
 657         comp->lo_entry_count = lsm->lsm_entry_count;
 658         comp->lo_preferred_mirror = -1;
 659
 660         if (equi(flr_state == LCM_FL_NONE, comp->lo_mirror_count > 1))
 661                 RETURN(-EINVAL);
 662
 663         OBD_ALLOC(comp->lo_mirrors,
 664                   comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 665         if (comp->lo_mirrors == NULL)
 666                 RETURN(-ENOMEM);
 667
 668         OBD_ALLOC(comp->lo_entries, entry_count * sizeof(*comp->lo_entries));
 669         if (comp->lo_entries == NULL)
 670                 RETURN(-ENOMEM);
 671
 672         /* Initiate all entry types and extents data at first */
 673         for (i = 0, j = 0, mirror_count = 1; i < entry_count; i++) {
 674                 int mirror_id = 0;
 675
 676                 lle = &comp->lo_entries[i];
 677
 678                 lle->lle_lsme = lsm->lsm_entries[i];
 679                 lle->lle_type = lov_entry_type(lle->lle_lsme);
 680                 switch (lle->lle_type) {
 681                 case LOV_PATTERN_RAID0:
 682                         lle->lle_comp_ops = &raid0_ops;
 683                         break;
 684                 case LOV_PATTERN_MDT:
 685                         lle->lle_comp_ops = &dom_ops;
 686                         break;
 687                 default:
 688                         CERROR("%s: unknown composite layout entry type %i\n",
 689                                lov2obd(dev->ld_lov)->obd_name,
 690                                lsm->lsm_entries[i]->lsme_pattern);
 691                         dump_lsm(D_ERROR, lsm);
 692                         RETURN(-EIO);
 693                 }
 694
 695                 lle->lle_extent = &lle->lle_lsme->lsme_extent;
 696                 lle->lle_valid = !(lle->lle_lsme->lsme_flags & LCME_FL_STALE);
 697
 698                 if (flr_state != LCM_FL_NONE)
 699                         mirror_id = mirror_id_of(lle->lle_lsme->lsme_id);
 700
 701                 lre = &comp->lo_mirrors[j];
 702                 if (i > 0) {
 703                         if (mirror_id == lre->lre_mirror_id) {
 704                                 lre->lre_valid |= lle->lle_valid;
 705                                 lre->lre_stale |= !lle->lle_valid;
 706                                 lre->lre_end = i;
 707                                 continue;
 708                         }
 709
 710                         /* new mirror detected, assume that the mirrors
 711                          * are shorted in layout */
 712                         ++mirror_count;
 713                         ++j;
 714                         if (j >= comp->lo_mirror_count)
 715                                 break;
 716
 717                         lre = &comp->lo_mirrors[j];
 718                 }
 719
 720                 /* entries must be sorted by mirrors */
 721                 lre->lre_mirror_id = mirror_id;
 722                 lre->lre_start = lre->lre_end = i;
 723                 lre->lre_preferred = !!(lle->lle_lsme->lsme_flags &
 724                                         LCME_FL_PREF_RD);
 725                 lre->lre_valid = lle->lle_valid;
 726                 lre->lre_stale = !lle->lle_valid;
 727         }
 728
 729         /* sanity check for FLR */
 730         if (mirror_count != comp->lo_mirror_count) {
 731                 CDEBUG(D_INODE, DFID
 732                        " doesn't have the # of mirrors it claims, %u/%u\n",
 733                        PFID(lu_object_fid(lov2lu(lov))), mirror_count,
 734                        comp->lo_mirror_count + 1);
 735
 736                 GOTO(out, result = -EINVAL);
 737         }
 738
 739         lov_foreach_layout_entry(lov, lle) {
 740                 int index = lov_layout_entry_index(lov, lle);
 741
 742                 /**
 743                  * If the component has not been init-ed on MDS side, for
 744                  * PFL layout, we'd know that the components beyond this one
 745                  * will be dynamically init-ed later on file write/trunc ops.
 746                  */
 747                 if (!lsme_inited(lle->lle_lsme))
 748                         continue;
 749
 750                 result = lle->lle_comp_ops->lco_init(env, dev, lov, index,
 751                                                      conf, lle);
 752                 if (result < 0)
 753                         break;
 754
 755                 LASSERT(ergo(psz > 0, psz == result));
 756                 psz = result;
 757         }
 758
 759         if (psz > 0)
 760                 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
 761
 762         /* decide the preferred mirror. It uses the hash value of lov_object
 763          * so that different clients would use different mirrors for read. */
 764         mirror_count = 0;
 765         seq = hash_long((unsigned long)lov, 8);
 766         for (i = 0; i < comp->lo_mirror_count; i++) {
 767                 unsigned int idx = (i + seq) % comp->lo_mirror_count;
 768
 769                 lre = lov_mirror_entry(lov, idx);
 770                 if (lre->lre_stale)
 771                         continue;
 772
 773                 mirror_count++; /* valid mirror */
 774
 775                 if (lre->lre_preferred || comp->lo_preferred_mirror < 0)
 776                         comp->lo_preferred_mirror = idx;
 777         }
 778         if (!mirror_count) {
 779                 CDEBUG(D_INODE, DFID
 780                        " doesn't have any valid mirrors\n",
 781                        PFID(lu_object_fid(lov2lu(lov))));
 782
 783                 comp->lo_preferred_mirror = 0;
 784         }
 785
 786         LASSERT(comp->lo_preferred_mirror >= 0);
 787
 788         EXIT;
 789 out:
 790         return result > 0 ? 0 : result;
 791 }
 792
 793 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
 794                           struct lov_object *lov, struct lov_stripe_md *lsm,
 795                           const struct cl_object_conf *conf,
 796                           union lov_layout_state *state)
 797 {
 798         return 0;
 799 }
 800
 801 static int lov_init_released(const struct lu_env *env,
 802                              struct lov_device *dev, struct lov_object *lov,
 803                              struct lov_stripe_md *lsm,
 804                              const struct cl_object_conf *conf,
 805                              union lov_layout_state *state)
 806 {
 807         LASSERT(lsm != NULL);
 808         LASSERT(lsm->lsm_is_released);
 809         LASSERT(lov->lo_lsm == NULL);
 810
 811         lov->lo_lsm = lsm_addref(lsm);
 812         return 0;
 813 }
 814
 815 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 816                             union lov_layout_state *state)
 817 {
 818         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 819
 820         lov_layout_wait(env, lov);
 821         return 0;
 822 }
 823
 824 static int lov_delete_composite(const struct lu_env *env,
 825                                 struct lov_object *lov,
 826                                 union lov_layout_state *state)
 827 {
 828         struct lov_layout_entry *entry;
 829         struct lov_layout_composite *comp = &state->composite;
 830
 831         ENTRY;
 832
 833         dump_lsm(D_INODE, lov->lo_lsm);
 834
 835         lov_layout_wait(env, lov);
 836         if (comp->lo_entries)
 837                 lov_foreach_layout_entry(lov, entry)
 838                         lov_delete_raid0(env, lov, entry);
 839
 840         RETURN(0);
 841 }
 842
 843 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 844                            union lov_layout_state *state)
 845 {
 846         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 847 }
 848
 849 static void lov_fini_composite(const struct lu_env *env,
 850                                struct lov_object *lov,
 851                                union lov_layout_state *state)
 852 {
 853         struct lov_layout_composite *comp = &state->composite;
 854         ENTRY;
 855
 856         if (comp->lo_entries != NULL) {
 857                 struct lov_layout_entry *entry;
 858
 859                 lov_foreach_layout_entry(lov, entry)
 860                         entry->lle_comp_ops->lco_fini(env, entry);
 861
 862                 OBD_FREE(comp->lo_entries,
 863                          comp->lo_entry_count * sizeof(*comp->lo_entries));
 864                 comp->lo_entries = NULL;
 865         }
 866
 867         if (comp->lo_mirrors != NULL) {
 868                 OBD_FREE(comp->lo_mirrors,
 869                          comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 870                 comp->lo_mirrors = NULL;
 871         }
 872
 873         memset(comp, 0, sizeof(*comp));
 874
 875         dump_lsm(D_INODE, lov->lo_lsm);
 876         lov_free_memmd(&lov->lo_lsm);
 877
 878         EXIT;
 879 }
 880
 881 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
 882                                 union lov_layout_state *state)
 883 {
 884         ENTRY;
 885         dump_lsm(D_INODE, lov->lo_lsm);
 886         lov_free_memmd(&lov->lo_lsm);
 887         EXIT;
 888 }
 889
 890 static int lov_print_empty(const struct lu_env *env, void *cookie,
 891                            lu_printer_t p, const struct lu_object *o)
 892 {
 893         (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
 894         return 0;
 895 }
 896
 897 static int lov_print_composite(const struct lu_env *env, void *cookie,
 898                                lu_printer_t p, const struct lu_object *o)
 899 {
 900         struct lov_object *lov = lu2lov(o);
 901         struct lov_stripe_md *lsm = lov->lo_lsm;
 902         int i;
 903
 904         (*p)(env, cookie, "entries: %d, %s, lsm{%p 0x%08X %d %u}:\n",
 905              lsm->lsm_entry_count,
 906              lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 907              lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 908              lsm->lsm_layout_gen);
 909
 910         for (i = 0; i < lsm->lsm_entry_count; i++) {
 911                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 912                 struct lov_layout_entry *lle = lov_entry(lov, i);
 913
 914                 (*p)(env, cookie,
 915                      DEXT ": { 0x%08X, %u, %#x, %u, %#x, %u, %u }\n",
 916                      PEXT(&lse->lsme_extent), lse->lsme_magic,
 917                      lse->lsme_id, lse->lsme_pattern, lse->lsme_layout_gen,
 918                      lse->lsme_flags, lse->lsme_stripe_count,
 919                      lse->lsme_stripe_size);
 920                 lov_print_raid0(env, cookie, p, lle);
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int lov_print_released(const struct lu_env *env, void *cookie,
 927                                 lu_printer_t p, const struct lu_object *o)
 928 {
 929         struct lov_object       *lov = lu2lov(o);
 930         struct lov_stripe_md    *lsm = lov->lo_lsm;
 931
 932         (*p)(env, cookie,
 933                 "released: %s, lsm{%p 0x%08X %d %u}:\n",
 934                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 935                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 936                 lsm->lsm_layout_gen);
 937         return 0;
 938 }
 939
 940 /**
 941  * Implements cl_object_operations::coo_attr_get() method for an object
 942  * without stripes (LLT_EMPTY layout type).
 943  *
 944  * The only attributes this layer is authoritative in this case is
 945  * cl_attr::cat_blocks---it's 0.
 946  */
 947 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 948                               struct cl_attr *attr)
 949 {
 950         attr->cat_blocks = 0;
 951         return 0;
 952 }
 953
 954 static int lov_attr_get_composite(const struct lu_env *env,
 955                                   struct cl_object *obj,
 956                                   struct cl_attr *attr)
 957 {
 958         struct lov_object       *lov = cl2lov(obj);
 959         struct lov_layout_entry *entry;
 960         int                      result = 0;
 961
 962         ENTRY;
 963
 964         attr->cat_size = 0;
 965         attr->cat_blocks = 0;
 966         lov_foreach_layout_entry(lov, entry) {
 967                 struct cl_attr *lov_attr = NULL;
 968                 int index = lov_layout_entry_index(lov, entry);
 969
 970                 if (!entry->lle_valid)
 971                         continue;
 972
 973                 /* PFL: This component has not been init-ed. */
 974                 if (!lsm_entry_inited(lov->lo_lsm, index))
 975                         continue;
 976
 977                 result = entry->lle_comp_ops->lco_getattr(env, lov, index,
 978                                                           entry, &lov_attr);
 979                 if (result < 0)
 980                         RETURN(result);
 981
 982                 if (lov_attr == NULL)
 983                         continue;
 984
 985                 CDEBUG(D_INODE, "COMP ID #%i: s=%llu m=%llu a=%llu c=%llu "
 986                        "b=%llu\n", index - 1, lov_attr->cat_size,
 987                        lov_attr->cat_mtime, lov_attr->cat_atime,
 988                        lov_attr->cat_ctime, lov_attr->cat_blocks);
 989
 990                 /* merge results */
 991                 attr->cat_blocks += lov_attr->cat_blocks;
 992                 if (attr->cat_size < lov_attr->cat_size)
 993                         attr->cat_size = lov_attr->cat_size;
 994                 if (attr->cat_kms < lov_attr->cat_kms)
 995                         attr->cat_kms = lov_attr->cat_kms;
 996                 if (attr->cat_atime < lov_attr->cat_atime)
 997                         attr->cat_atime = lov_attr->cat_atime;
 998                 if (attr->cat_ctime < lov_attr->cat_ctime)
 999                         attr->cat_ctime = lov_attr->cat_ctime;
1000                 if (attr->cat_mtime < lov_attr->cat_mtime)
1001                         attr->cat_mtime = lov_attr->cat_mtime;
1002         }
1003
1004         RETURN(0);
1005 }
1006
1007 const static struct lov_layout_operations lov_dispatch[] = {
1008         [LLT_EMPTY] = {
1009                 .llo_init      = lov_init_empty,
1010                 .llo_delete    = lov_delete_empty,
1011                 .llo_fini      = lov_fini_empty,
1012                 .llo_print     = lov_print_empty,
1013                 .llo_page_init = lov_page_init_empty,
1014                 .llo_lock_init = lov_lock_init_empty,
1015                 .llo_io_init   = lov_io_init_empty,
1016                 .llo_getattr   = lov_attr_get_empty,
1017         },
1018         [LLT_RELEASED] = {
1019                 .llo_init      = lov_init_released,
1020                 .llo_delete    = lov_delete_empty,
1021                 .llo_fini      = lov_fini_released,
1022                 .llo_print     = lov_print_released,
1023                 .llo_page_init = lov_page_init_empty,
1024                 .llo_lock_init = lov_lock_init_empty,
1025                 .llo_io_init   = lov_io_init_released,
1026                 .llo_getattr   = lov_attr_get_empty,
1027         },
1028         [LLT_COMP] = {
1029                 .llo_init      = lov_init_composite,
1030                 .llo_delete    = lov_delete_composite,
1031                 .llo_fini      = lov_fini_composite,
1032                 .llo_print     = lov_print_composite,
1033                 .llo_page_init = lov_page_init_composite,
1034                 .llo_lock_init = lov_lock_init_composite,
1035                 .llo_io_init   = lov_io_init_composite,
1036                 .llo_getattr   = lov_attr_get_composite,
1037         },
1038 };
1039
1040 /**
1041  * Performs a double-dispatch based on the layout type of an object.
1042  */
1043 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)              \
1044 ({                                                      \
1045         struct lov_object *__obj = (obj);               \
1046         enum lov_layout_type __llt;                     \
1047                                                         \
1048         __llt = __obj->lo_type;                         \
1049         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));      \
1050         lov_dispatch[__llt].op(__VA_ARGS__);            \
1051 })
1052
1053 /**
1054  * Return lov_layout_type associated with a given lsm
1055  */
1056 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
1057 {
1058         if (lsm == NULL)
1059                 return LLT_EMPTY;
1060
1061         if (lsm->lsm_is_released)
1062                 return LLT_RELEASED;
1063
1064         if (lsm->lsm_magic == LOV_MAGIC_V1 ||
1065             lsm->lsm_magic == LOV_MAGIC_V3 ||
1066             lsm->lsm_magic == LOV_MAGIC_COMP_V1)
1067                 return LLT_COMP;
1068
1069         return LLT_EMPTY;
1070 }
1071
1072 static inline void lov_conf_freeze(struct lov_object *lov)
1073 {
1074         CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
1075                 lov, lov->lo_owner, current);
1076         if (lov->lo_owner != current)
1077                 down_read(&lov->lo_type_guard);
1078 }
1079
1080 static inline void lov_conf_thaw(struct lov_object *lov)
1081 {
1082         CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
1083                 lov, lov->lo_owner, current);
1084         if (lov->lo_owner != current)
1085                 up_read(&lov->lo_type_guard);
1086 }
1087
1088 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
1089 ({                                                                      \
1090         struct lov_object                      *__obj = (obj);          \
1091         int                                     __lock = !!(lock);      \
1092         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
1093                                                                         \
1094         if (__lock)                                                     \
1095                 lov_conf_freeze(__obj);                                 \
1096         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
1097         if (__lock)                                                     \
1098                 lov_conf_thaw(__obj);                                   \
1099         __result;                                                       \
1100 })
1101
1102 /**
1103  * Performs a locked double-dispatch based on the layout type of an object.
1104  */
1105 #define LOV_2DISPATCH(obj, op, ...)                     \
1106         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
1107
1108 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
1109 do {                                                                    \
1110         struct lov_object                      *__obj = (obj);          \
1111         enum lov_layout_type                    __llt;                  \
1112                                                                         \
1113         lov_conf_freeze(__obj);                                         \
1114         __llt = __obj->lo_type;                                         \
1115         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));                      \
1116         lov_dispatch[__llt].op(__VA_ARGS__);                            \
1117         lov_conf_thaw(__obj);                                           \
1118 } while (0)
1119
1120 static void lov_conf_lock(struct lov_object *lov)
1121 {
1122         LASSERT(lov->lo_owner != current);
1123         down_write(&lov->lo_type_guard);
1124         LASSERT(lov->lo_owner == NULL);
1125         lov->lo_owner = current;
1126         CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
1127                 lov, lov->lo_owner);
1128 }
1129
1130 static void lov_conf_unlock(struct lov_object *lov)
1131 {
1132         CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
1133                 lov, lov->lo_owner);
1134         lov->lo_owner = NULL;
1135         up_write(&lov->lo_type_guard);
1136 }
1137
1138 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
1139 {
1140         struct l_wait_info lwi = { 0 };
1141         ENTRY;
1142
1143         while (atomic_read(&lov->lo_active_ios) > 0) {
1144                 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
1145                         PFID(lu_object_fid(lov2lu(lov))),
1146                         atomic_read(&lov->lo_active_ios));
1147
1148                 l_wait_event(lov->lo_waitq,
1149                              atomic_read(&lov->lo_active_ios) == 0, &lwi);
1150         }
1151         RETURN(0);
1152 }
1153
1154 static int lov_layout_change(const struct lu_env *unused,
1155                              struct lov_object *lov, struct lov_stripe_md *lsm,
1156                              const struct cl_object_conf *conf)
1157 {
1158         enum lov_layout_type llt = lov_type(lsm);
1159         union lov_layout_state *state = &lov->u;
1160         const struct lov_layout_operations *old_ops;
1161         const struct lov_layout_operations *new_ops;
1162         struct lov_device *lov_dev = lov_object_dev(lov);
1163         struct lu_env *env;
1164         __u16 refcheck;
1165         int rc;
1166         ENTRY;
1167
1168         LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch));
1169
1170         env = cl_env_get(&refcheck);
1171         if (IS_ERR(env))
1172                 RETURN(PTR_ERR(env));
1173
1174         LASSERT(llt < ARRAY_SIZE(lov_dispatch));
1175
1176         CDEBUG(D_INODE, DFID" from %s to %s\n",
1177                PFID(lu_object_fid(lov2lu(lov))),
1178                llt2str(lov->lo_type), llt2str(llt));
1179
1180         old_ops = &lov_dispatch[lov->lo_type];
1181         new_ops = &lov_dispatch[llt];
1182
1183         rc = cl_object_prune(env, &lov->lo_cl);
1184         if (rc != 0)
1185                 GOTO(out, rc);
1186
1187         rc = old_ops->llo_delete(env, lov, &lov->u);
1188         if (rc != 0)
1189                 GOTO(out, rc);
1190
1191         old_ops->llo_fini(env, lov, &lov->u);
1192
1193         LASSERT(atomic_read(&lov->lo_active_ios) == 0);
1194
1195         CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
1196                PFID(lu_object_fid(lov2lu(lov))), lov, llt);
1197
1198         /* page bufsize fixup */
1199         cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
1200                 lov_page_slice_fixup(lov, NULL);
1201
1202         lov->lo_type = llt;
1203         rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
1204         if (rc != 0) {
1205                 struct obd_device *obd = lov2obd(lov_dev->ld_lov);
1206
1207                 CERROR("%s: cannot apply new layout on "DFID" : rc = %d\n",
1208                        obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
1209                 new_ops->llo_delete(env, lov, state);
1210                 new_ops->llo_fini(env, lov, state);
1211                 /* this file becomes an EMPTY file. */
1212                 lov->lo_type = LLT_EMPTY;
1213                 GOTO(out, rc);
1214         }
1215
1216 out:
1217         cl_env_put(env, &refcheck);
1218         RETURN(rc);
1219 }
1220
1221 /*****************************************************************************
1222  *
1223  * Lov object operations.
1224  *
1225  */
1226 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
1227                     const struct lu_object_conf *conf)
1228 {
1229         struct lov_object            *lov   = lu2lov(obj);
1230         struct lov_device            *dev   = lov_object_dev(lov);
1231         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
1232         union lov_layout_state       *set   = &lov->u;
1233         const struct lov_layout_operations *ops;
1234         struct lov_stripe_md *lsm = NULL;
1235         int rc;
1236         ENTRY;
1237
1238         init_rwsem(&lov->lo_type_guard);
1239         atomic_set(&lov->lo_active_ios, 0);
1240         init_waitqueue_head(&lov->lo_waitq);
1241         cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
1242
1243         lov->lo_type = LLT_EMPTY;
1244         if (cconf->u.coc_layout.lb_buf != NULL) {
1245                 lsm = lov_unpackmd(dev->ld_lov,
1246                                    cconf->u.coc_layout.lb_buf,
1247                                    cconf->u.coc_layout.lb_len);
1248                 if (IS_ERR(lsm))
1249                         RETURN(PTR_ERR(lsm));
1250
1251                 dump_lsm(D_INODE, lsm);
1252         }
1253
1254         /* no locking is necessary, as object is being created */
1255         lov->lo_type = lov_type(lsm);
1256         ops = &lov_dispatch[lov->lo_type];
1257         rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
1258         if (rc != 0)
1259                 GOTO(out_lsm, rc);
1260
1261 out_lsm:
1262         lov_lsm_put(lsm);
1263
1264         RETURN(rc);
1265 }
1266
1267 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
1268                         const struct cl_object_conf *conf)
1269 {
1270         struct lov_stripe_md    *lsm = NULL;
1271         struct lov_object       *lov = cl2lov(obj);
1272         int                      result = 0;
1273         ENTRY;
1274
1275         if (conf->coc_opc == OBJECT_CONF_SET &&
1276             conf->u.coc_layout.lb_buf != NULL) {
1277                 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
1278                                    conf->u.coc_layout.lb_buf,
1279                                    conf->u.coc_layout.lb_len);
1280                 if (IS_ERR(lsm))
1281                         RETURN(PTR_ERR(lsm));
1282                 dump_lsm(D_INODE, lsm);
1283         }
1284
1285         lov_conf_lock(lov);
1286         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
1287                 lov->lo_layout_invalid = true;
1288                 GOTO(out, result = 0);
1289         }
1290
1291         if (conf->coc_opc == OBJECT_CONF_WAIT) {
1292                 if (lov->lo_layout_invalid &&
1293                     atomic_read(&lov->lo_active_ios) > 0) {
1294                         lov_conf_unlock(lov);
1295                         result = lov_layout_wait(env, lov);
1296                         lov_conf_lock(lov);
1297                 }
1298                 GOTO(out, result);
1299         }
1300
1301         LASSERT(conf->coc_opc == OBJECT_CONF_SET);
1302
1303         if ((lsm == NULL && lov->lo_lsm == NULL) ||
1304             ((lsm != NULL && lov->lo_lsm != NULL) &&
1305              (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
1306              (lov->lo_lsm->lsm_entries[0]->lsme_pattern ==
1307               lsm->lsm_entries[0]->lsme_pattern))) {
1308                 /* same version of layout */
1309                 lov->lo_layout_invalid = false;
1310                 GOTO(out, result = 0);
1311         }
1312
1313         /* will change layout - check if there still exists active IO. */
1314         if (atomic_read(&lov->lo_active_ios) > 0) {
1315                 lov->lo_layout_invalid = true;
1316                 GOTO(out, result = -EBUSY);
1317         }
1318
1319         result = lov_layout_change(env, lov, lsm, conf);
1320         lov->lo_layout_invalid = result != 0;
1321         EXIT;
1322
1323 out:
1324         lov_conf_unlock(lov);
1325         lov_lsm_put(lsm);
1326         CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
1327                PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
1328         RETURN(result);
1329 }
1330
1331 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
1332 {
1333         struct lov_object *lov = lu2lov(obj);
1334
1335         ENTRY;
1336         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
1337         EXIT;
1338 }
1339
1340 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
1341 {
1342         struct lov_object *lov = lu2lov(obj);
1343
1344         ENTRY;
1345         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
1346         lu_object_fini(obj);
1347         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
1348         EXIT;
1349 }
1350
1351 static int lov_object_print(const struct lu_env *env, void *cookie,
1352                             lu_printer_t p, const struct lu_object *o)
1353 {
1354         return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
1355 }
1356
1357 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
1358                   struct cl_page *page, pgoff_t index)
1359 {
1360         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
1361                                     index);
1362 }
1363
1364 /**
1365  * Implements cl_object_operations::clo_io_init() method for lov
1366  * layer. Dispatches to the appropriate layout io initialization method.
1367  */
1368 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
1369                 struct cl_io *io)
1370 {
1371         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_preserved);
1372
1373         CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
1374                PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
1375                io->ci_ignore_layout, io->ci_verify_layout);
1376
1377         /* IO type CIT_MISC with ci_ignore_layout set are usually invoked from
1378          * the OSC layer. It shouldn't take lov layout conf lock in that case,
1379          * because as long as the OSC object exists, the layout can't be
1380          * reconfigured. */
1381         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
1382                         !(io->ci_ignore_layout && io->ci_type == CIT_MISC),
1383                         env, obj, io);
1384 }
1385
1386 /**
1387  * An implementation of cl_object_operations::clo_attr_get() method for lov
1388  * layer. For raid0 layout this collects and merges attributes of all
1389  * sub-objects.
1390  */
1391 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
1392                         struct cl_attr *attr)
1393 {
1394         /* do not take lock, as this function is called under a
1395          * spin-lock. Layout is protected from changing by ongoing IO. */
1396         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
1397 }
1398
1399 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1400                            const struct cl_attr *attr, unsigned valid)
1401 {
1402         /*
1403          * No dispatch is required here, as no layout implements this.
1404          */
1405         return 0;
1406 }
1407
1408 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1409                   struct cl_lock *lock, const struct cl_io *io)
1410 {
1411         /* No need to lock because we've taken one refcount of layout.  */
1412         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1413                                     io);
1414 }
1415
1416 /**
1417  * We calculate on which OST the mapping will end. If the length of mapping
1418  * is greater than (stripe_size * stripe_count) then the last_stripe will
1419  * will be one just before start_stripe. Else we check if the mapping
1420  * intersects each OST and find last_stripe.
1421  * This function returns the last_stripe and also sets the stripe_count
1422  * over which the mapping is spread
1423  *
1424  * \param lsm [in]              striping information for the file
1425  * \param index [in]            stripe component index
1426  * \param ext [in]              logical extent of mapping
1427  * \param start_stripe [in]     starting stripe of the mapping
1428  * \param stripe_count [out]    the number of stripes across which to map is
1429  *                              returned
1430  *
1431  * \retval last_stripe          return the last stripe of the mapping
1432  */
1433 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, int index,
1434                                    struct lu_extent *ext,
1435                                    int start_stripe, int *stripe_count)
1436 {
1437         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1438         int last_stripe;
1439         u64 obd_start;
1440         u64 obd_end;
1441         int i, j;
1442
1443         if (ext->e_end - ext->e_start >
1444             lsme->lsme_stripe_size * lsme->lsme_stripe_count) {
1445                 last_stripe = (start_stripe < 1 ? lsme->lsme_stripe_count - 1 :
1446                                                   start_stripe - 1);
1447                 *stripe_count = lsme->lsme_stripe_count;
1448         } else {
1449                 for (j = 0, i = start_stripe; j < lsme->lsme_stripe_count;
1450                      i = (i + 1) % lsme->lsme_stripe_count, j++) {
1451                         if ((lov_stripe_intersects(lsm, index,  i, ext,
1452                                                    &obd_start, &obd_end)) == 0)
1453                                 break;
1454                 }
1455                 *stripe_count = j;
1456                 last_stripe = (start_stripe + j - 1) % lsme->lsme_stripe_count;
1457         }
1458
1459         return last_stripe;
1460 }
1461
1462 /**
1463  * Set fe_device and copy extents from local buffer into main return buffer.
1464  *
1465  * \param fiemap [out]          fiemap to hold all extents
1466  * \param lcl_fm_ext [in]       array of fiemap extents get from OSC layer
1467  * \param ost_index [in]        OST index to be written into the fm_device
1468  *                              field for each extent
1469  * \param ext_count [in]        number of extents to be copied
1470  * \param current_extent [in]   where to start copying in the extent array
1471  */
1472 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1473                                          struct fiemap_extent *lcl_fm_ext,
1474                                          int ost_index, unsigned int ext_count,
1475                                          int current_extent)
1476 {
1477         char            *to;
1478         unsigned int    ext;
1479
1480         for (ext = 0; ext < ext_count; ext++) {
1481                 lcl_fm_ext[ext].fe_device = ost_index;
1482                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1483         }
1484
1485         /* Copy fm_extent's from fm_local to return buffer */
1486         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1487         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1488 }
1489
1490 #define FIEMAP_BUFFER_SIZE 4096
1491
1492 /**
1493  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1494  * call. The local end offset and the device are sent in the first
1495  * fm_extent. This function calculates the stripe number from the index.
1496  * This function returns a stripe_no on which mapping is to be restarted.
1497  *
1498  * This function returns fm_end_offset which is the in-OST offset at which
1499  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1500  * will re-calculate proper offset in next stripe.
1501  * Note that the first extent is passed to lov_get_info via the value field.
1502  *
1503  * \param fiemap [in]           fiemap request header
1504  * \param lsm [in]              striping information for the file
1505  * \param index [in]            stripe component index
1506  * \param ext [in]              logical extent of mapping
1507  * \param start_stripe [out]    starting stripe will be returned in this
1508  */
1509 static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1510                                      struct lov_stripe_md *lsm,
1511                                      int index, struct lu_extent *ext,
1512                                      int *start_stripe)
1513 {
1514         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1515         u64 local_end = fiemap->fm_extents[0].fe_logical;
1516         u64 lun_start;
1517         u64 lun_end;
1518         u64 fm_end_offset;
1519         int stripe_no = -1;
1520         int i;
1521
1522         if (fiemap->fm_extent_count == 0 ||
1523             fiemap->fm_extents[0].fe_logical == 0)
1524                 return 0;
1525
1526         /* Find out stripe_no from ost_index saved in the fe_device */
1527         for (i = 0; i < lsme->lsme_stripe_count; i++) {
1528                 struct lov_oinfo *oinfo = lsme->lsme_oinfo[i];
1529
1530                 if (lov_oinfo_is_dummy(oinfo))
1531                         continue;
1532
1533                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1534                         stripe_no = i;
1535                         break;
1536                 }
1537         }
1538
1539         if (stripe_no == -1)
1540                 return -EINVAL;
1541
1542         /* If we have finished mapping on previous device, shift logical
1543          * offset to start of next device */
1544         if (lov_stripe_intersects(lsm, index, stripe_no, ext,
1545                                    &lun_start, &lun_end) != 0 &&
1546             local_end < lun_end) {
1547                 fm_end_offset = local_end;
1548                 *start_stripe = stripe_no;
1549         } else {
1550                 /* This is a special value to indicate that caller should
1551                  * calculate offset in next stripe. */
1552                 fm_end_offset = 0;
1553                 *start_stripe = (stripe_no + 1) % lsme->lsme_stripe_count;
1554         }
1555
1556         return fm_end_offset;
1557 }
1558
1559 struct fiemap_state {
1560         struct fiemap           *fs_fm;
1561         struct lu_extent        fs_ext;
1562         u64                     fs_length;
1563         u64                     fs_end_offset;
1564         int                     fs_cur_extent;
1565         int                     fs_cnt_need;
1566         int                     fs_start_stripe;
1567         int                     fs_last_stripe;
1568         bool                    fs_device_done;
1569         bool                    fs_finish_stripe;
1570         bool                    fs_enough;
1571 };
1572
1573 static struct cl_object *lov_find_subobj(const struct lu_env *env,
1574                                          struct lov_object *lov,
1575                                          struct lov_stripe_md *lsm,
1576                                          int index)
1577 {
1578         struct lov_device       *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
1579         struct lov_thread_info  *lti = lov_env_info(env);
1580         struct lu_fid           *ofid = &lti->lti_fid;
1581         struct lov_oinfo        *oinfo;
1582         struct cl_device        *subdev;
1583         int                     entry = lov_comp_entry(index);
1584         int                     stripe = lov_comp_stripe(index);
1585         int                     ost_idx;
1586         int                     rc;
1587         struct cl_object        *result;
1588
1589         if (lov->lo_type != LLT_COMP)
1590                 GOTO(out, result = NULL);
1591
1592         if (entry >= lsm->lsm_entry_count ||
1593             stripe >= lsm->lsm_entries[entry]->lsme_stripe_count)
1594                 GOTO(out, result = NULL);
1595
1596         oinfo = lsm->lsm_entries[entry]->lsme_oinfo[stripe];
1597         ost_idx = oinfo->loi_ost_idx;
1598         rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
1599         if (rc != 0)
1600                 GOTO(out, result = NULL);
1601
1602         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
1603         result = lov_sub_find(env, subdev, ofid, NULL);
1604 out:
1605         if (result == NULL)
1606                 result = ERR_PTR(-EINVAL);
1607         return result;
1608 }
1609
1610 int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj,
1611                       struct lov_stripe_md *lsm, struct fiemap *fiemap,
1612                       size_t *buflen, struct ll_fiemap_info_key *fmkey,
1613                       int index, int stripeno, struct fiemap_state *fs)
1614 {
1615         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1616         struct cl_object *subobj;
1617         struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1618         struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0];
1619         u64 req_fm_len; /* Stores length of required mapping */
1620         u64 len_mapped_single_call;
1621         u64 lun_start;
1622         u64 lun_end;
1623         u64 obd_object_end;
1624         unsigned int ext_count;
1625         /* EOF for object */
1626         bool ost_eof = false;
1627         /* done with required mapping for this OST? */
1628         bool ost_done = false;
1629         int ost_index;
1630         int rc = 0;
1631
1632         fs->fs_device_done = false;
1633         /* Find out range of mapping on this stripe */
1634         if ((lov_stripe_intersects(lsm, index, stripeno, &fs->fs_ext,
1635                                    &lun_start, &obd_object_end)) == 0)
1636                 return 0;
1637
1638         if (lov_oinfo_is_dummy(lsme->lsme_oinfo[stripeno]))
1639                 return -EIO;
1640
1641         /* If this is a continuation FIEMAP call and we are on
1642          * starting stripe then lun_start needs to be set to
1643          * end_offset */
1644         if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe)
1645                 lun_start = fs->fs_end_offset;
1646         lun_end = lov_size_to_stripe(lsm, index, fs->fs_ext.e_end, stripeno);
1647         if (lun_start == lun_end)
1648                 return 0;
1649
1650         req_fm_len = obd_object_end - lun_start;
1651         fs->fs_fm->fm_length = 0;
1652         len_mapped_single_call = 0;
1653
1654         /* find lobsub object */
1655         subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1656                                  lov_comp_index(index, stripeno));
1657         if (IS_ERR(subobj))
1658                 return PTR_ERR(subobj);
1659         /* If the output buffer is very large and the objects have many
1660          * extents we may need to loop on a single OST repeatedly */
1661         do {
1662                 if (fiemap->fm_extent_count > 0) {
1663                         /* Don't get too many extents. */
1664                         if (fs->fs_cur_extent + fs->fs_cnt_need >
1665                             fiemap->fm_extent_count)
1666                                 fs->fs_cnt_need = fiemap->fm_extent_count -
1667                                                   fs->fs_cur_extent;
1668                 }
1669
1670                 lun_start += len_mapped_single_call;
1671                 fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call;
1672                 req_fm_len = fs->fs_fm->fm_length;
1673                 /**
1674                  * If we've collected enough extent map, we'd request 1 more,
1675                  * to see whether we coincidentally finished all available
1676                  * extent map, so that FIEMAP_EXTENT_LAST would be set.
1677                  */
1678                 fs->fs_fm->fm_extent_count = fs->fs_enough ?
1679                                              1 : fs->fs_cnt_need;
1680                 fs->fs_fm->fm_mapped_extents = 0;
1681                 fs->fs_fm->fm_flags = fiemap->fm_flags;
1682
1683                 ost_index = lsme->lsme_oinfo[stripeno]->loi_ost_idx;
1684
1685                 if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count)
1686                         GOTO(obj_put, rc = -EINVAL);
1687                 /* If OST is inactive, return extent with UNKNOWN flag. */
1688                 if (!lov->lov_tgts[ost_index]->ltd_active) {
1689                         fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST;
1690                         fs->fs_fm->fm_mapped_extents = 1;
1691
1692                         fm_ext[0].fe_logical = lun_start;
1693                         fm_ext[0].fe_length = obd_object_end - lun_start;
1694                         fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1695
1696                         goto inactive_tgt;
1697                 }
1698
1699                 fs->fs_fm->fm_start = lun_start;
1700                 fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1701                 memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm));
1702                 *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count);
1703
1704                 rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen);
1705                 if (rc != 0)
1706                         GOTO(obj_put, rc);
1707 inactive_tgt:
1708                 ext_count = fs->fs_fm->fm_mapped_extents;
1709                 if (ext_count == 0) {
1710                         ost_done = true;
1711                         fs->fs_device_done = true;
1712                         /* If last stripe has hold at the end,
1713                          * we need to return */
1714                         if (stripeno == fs->fs_last_stripe) {
1715                                 fiemap->fm_mapped_extents = 0;
1716                                 fs->fs_finish_stripe = true;
1717                                 GOTO(obj_put, rc);
1718                         }
1719                         break;
1720                 } else if (fs->fs_enough) {
1721                         /*
1722                          * We've collected enough extents and there are
1723                          * more extents after it.
1724                          */
1725                         GOTO(obj_put, rc);
1726                 }
1727
1728                 /* If we just need num of extents, got to next device */
1729                 if (fiemap->fm_extent_count == 0) {
1730                         fs->fs_cur_extent += ext_count;
1731                         break;
1732                 }
1733
1734                 /* prepare to copy retrived map extents */
1735                 len_mapped_single_call = fm_ext[ext_count - 1].fe_logical +
1736                                          fm_ext[ext_count - 1].fe_length -
1737                                          lun_start;
1738
1739                 /* Have we finished mapping on this device? */
1740                 if (req_fm_len <= len_mapped_single_call) {
1741                         ost_done = true;
1742                         fs->fs_device_done = true;
1743                 }
1744
1745                 /* Clear the EXTENT_LAST flag which can be present on
1746                  * the last extent */
1747                 if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST)
1748                         fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST;
1749                 if (lov_stripe_size(lsm, index,
1750                                     fm_ext[ext_count - 1].fe_logical +
1751                                     fm_ext[ext_count - 1].fe_length,
1752                                     stripeno) >= fmkey->lfik_oa.o_size) {
1753                         ost_eof = true;
1754                         fs->fs_device_done = true;
1755                 }
1756
1757                 fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index,
1758                                              ext_count, fs->fs_cur_extent);
1759                 fs->fs_cur_extent += ext_count;
1760
1761                 /* Ran out of available extents? */
1762                 if (fs->fs_cur_extent >= fiemap->fm_extent_count)
1763                         fs->fs_enough = true;
1764         } while (!ost_done && !ost_eof);
1765
1766         if (stripeno == fs->fs_last_stripe)
1767                 fs->fs_finish_stripe = true;
1768 obj_put:
1769         cl_object_put(env, subobj);
1770
1771         return rc;
1772 }
1773
1774 /**
1775  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1776  * This also handles the restarting of FIEMAP calls in case mapping overflows
1777  * the available number of extents in single call.
1778  *
1779  * \param env [in]              lustre environment
1780  * \param obj [in]              file object
1781  * \param fmkey [in]            fiemap request header and other info
1782  * \param fiemap [out]          fiemap buffer holding retrived map extents
1783  * \param buflen [in/out]       max buffer length of @fiemap, when iterate
1784  *                              each OST, it is used to limit max map needed
1785  * \retval 0    success
1786  * \retval < 0  error
1787  */
1788 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1789                              struct ll_fiemap_info_key *fmkey,
1790                              struct fiemap *fiemap, size_t *buflen)
1791 {
1792         struct lov_stripe_md_entry *lsme;
1793         struct lov_stripe_md *lsm;
1794         struct fiemap *fm_local = NULL;
1795         loff_t whole_start;
1796         loff_t whole_end;
1797         int entry;
1798         int start_entry;
1799         int end_entry;
1800         int cur_stripe = 0;
1801         int stripe_count;
1802         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1803         int rc = 0;
1804         struct fiemap_state fs = { 0 };
1805         ENTRY;
1806
1807         lsm = lov_lsm_addref(cl2lov(obj));
1808         if (lsm == NULL) {
1809                 /* no extent: there is no object for mapping */
1810                 fiemap->fm_mapped_extents = 0;
1811                 return 0;
1812         }
1813
1814         if (!(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
1815                 /**
1816                  * If the entry count > 1 or stripe_count > 1 and the
1817                  * application does not understand DEVICE_ORDER flag,
1818                  * it cannot interpret the extents correctly.
1819                  */
1820                 if (lsm->lsm_entry_count > 1 ||
1821                     (lsm->lsm_entry_count == 1 &&
1822                      lsm->lsm_entries[0]->lsme_stripe_count > 1))
1823                         GOTO(out_lsm, rc = -ENOTSUPP);
1824         }
1825
1826         /* No support for DOM layout yet. */
1827         if (lsme_is_dom(lsm->lsm_entries[0]))
1828                 GOTO(out_lsm, rc = -ENOTSUPP);
1829
1830         if (lsm->lsm_is_released) {
1831                 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1832                         /**
1833                          * released file, return a minimal FIEMAP if
1834                          * request fits in file-size.
1835                          */
1836                         fiemap->fm_mapped_extents = 1;
1837                         fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1838                         if (fiemap->fm_start + fiemap->fm_length <
1839                             fmkey->lfik_oa.o_size)
1840                                 fiemap->fm_extents[0].fe_length =
1841                                         fiemap->fm_length;
1842                         else
1843                                 fiemap->fm_extents[0].fe_length =
1844                                         fmkey->lfik_oa.o_size -
1845                                         fiemap->fm_start;
1846                         fiemap->fm_extents[0].fe_flags |=
1847                                 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1848                 }
1849                 GOTO(out_lsm, rc = 0);
1850         }
1851
1852         /* buffer_size is small to hold fm_extent_count of extents. */
1853         if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1854                 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1855
1856         OBD_ALLOC_LARGE(fm_local, buffer_size);
1857         if (fm_local == NULL)
1858                 GOTO(out_lsm, rc = -ENOMEM);
1859
1860         /**
1861          * Requested extent count exceeds the fiemap buffer size, shrink our
1862          * ambition.
1863          */
1864         if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1865                 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1866         if (fiemap->fm_extent_count == 0)
1867                 fs.fs_cnt_need = 0;
1868
1869         fs.fs_enough = false;
1870         fs.fs_cur_extent = 0;
1871         fs.fs_fm = fm_local;
1872         fs.fs_cnt_need = fiemap_size_to_count(buffer_size);
1873
1874         whole_start = fiemap->fm_start;
1875         /* whole_start is beyond the end of the file */
1876         if (whole_start > fmkey->lfik_oa.o_size)
1877                 GOTO(out_fm_local, rc = -EINVAL);
1878         whole_end = (fiemap->fm_length == OBD_OBJECT_EOF) ?
1879                                         fmkey->lfik_oa.o_size :
1880                                         whole_start + fiemap->fm_length - 1;
1881         /**
1882          * If fiemap->fm_length != OBD_OBJECT_EOF but whole_end exceeds file
1883          * size
1884          */
1885         if (whole_end > fmkey->lfik_oa.o_size)
1886                 whole_end = fmkey->lfik_oa.o_size;
1887
1888         start_entry = lov_lsm_entry(lsm, whole_start);
1889         end_entry = lov_lsm_entry(lsm, whole_end);
1890         if (end_entry == -1)
1891                 end_entry = lsm->lsm_entry_count - 1;
1892
1893         if (start_entry == -1 || end_entry == -1)
1894                 GOTO(out_fm_local, rc = -EINVAL);
1895
1896         /* TODO: rewrite it with lov_foreach_io_layout() */
1897         for (entry = start_entry; entry <= end_entry; entry++) {
1898                 lsme = lsm->lsm_entries[entry];
1899
1900                 if (!lsme_inited(lsme))
1901                         break;
1902
1903                 if (entry == start_entry)
1904                         fs.fs_ext.e_start = whole_start;
1905                 else
1906                         fs.fs_ext.e_start = lsme->lsme_extent.e_start;
1907                 if (entry == end_entry)
1908                         fs.fs_ext.e_end = whole_end;
1909                 else
1910                         fs.fs_ext.e_end = lsme->lsme_extent.e_end - 1;
1911                 fs.fs_length = fs.fs_ext.e_end - fs.fs_ext.e_start + 1;
1912
1913                 /* Calculate start stripe, last stripe and length of mapping */
1914                 fs.fs_start_stripe = lov_stripe_number(lsm, entry,
1915                                                        fs.fs_ext.e_start);
1916                 fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, entry,
1917                                         &fs.fs_ext, fs.fs_start_stripe,
1918                                         &stripe_count);
1919                 fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, entry,
1920                                         &fs.fs_ext, &fs.fs_start_stripe);
1921                 /* Check each stripe */
1922                 for (cur_stripe = fs.fs_start_stripe; stripe_count > 0;
1923                      --stripe_count,
1924                      cur_stripe = (cur_stripe + 1) % lsme->lsme_stripe_count) {
1925                         rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen,
1926                                                fmkey, entry, cur_stripe, &fs);
1927                         if (rc < 0)
1928                                 GOTO(out_fm_local, rc);
1929                         if (fs.fs_enough)
1930                                 GOTO(finish, rc);
1931                         if (fs.fs_finish_stripe)
1932                                 break;
1933                 } /* for each stripe */
1934         } /* for covering layout component */
1935         /*
1936          * We've traversed all components, set @entry to the last component
1937          * entry, it's for the last stripe check.
1938          */
1939         entry--;
1940 finish:
1941         /* Indicate that we are returning device offsets unless file just has
1942          * single stripe */
1943         if (lsm->lsm_entry_count > 1 ||
1944             (lsm->lsm_entry_count == 1 &&
1945              lsm->lsm_entries[0]->lsme_stripe_count > 1))
1946                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1947
1948         if (fiemap->fm_extent_count == 0)
1949                 goto skip_last_device_calc;
1950
1951         /* Check if we have reached the last stripe and whether mapping for that
1952          * stripe is done. */
1953         if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done)
1954                 fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |=
1955                                                              FIEMAP_EXTENT_LAST;
1956 skip_last_device_calc:
1957         fiemap->fm_mapped_extents = fs.fs_cur_extent;
1958 out_fm_local:
1959         OBD_FREE_LARGE(fm_local, buffer_size);
1960
1961 out_lsm:
1962         lov_lsm_put(lsm);
1963         return rc;
1964 }
1965
1966 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
1967                                 struct lov_user_md __user *lum, size_t size)
1968 {
1969         struct lov_object       *lov = cl2lov(obj);
1970         struct lov_stripe_md    *lsm;
1971         int                     rc = 0;
1972         ENTRY;
1973
1974         lsm = lov_lsm_addref(lov);
1975         if (lsm == NULL)
1976                 RETURN(-ENODATA);
1977
1978         rc = lov_getstripe(env, cl2lov(obj), lsm, lum, size);
1979         lov_lsm_put(lsm);
1980         RETURN(rc);
1981 }
1982
1983 static int lov_object_layout_get(const struct lu_env *env,
1984                                  struct cl_object *obj,
1985                                  struct cl_layout *cl)
1986 {
1987         struct lov_object *lov = cl2lov(obj);
1988         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
1989         struct lu_buf *buf = &cl->cl_buf;
1990         ssize_t rc;
1991         ENTRY;
1992
1993         if (lsm == NULL) {
1994                 cl->cl_size = 0;
1995                 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
1996
1997                 RETURN(0);
1998         }
1999
2000         cl->cl_size = lov_comp_md_size(lsm);
2001         cl->cl_layout_gen = lsm->lsm_layout_gen;
2002         cl->cl_dom_comp_size = 0;
2003         if (lsm_is_composite(lsm->lsm_magic)) {
2004                 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[0];
2005
2006                 cl->cl_is_composite = true;
2007
2008                 if (lsme_is_dom(lsme))
2009                         cl->cl_dom_comp_size = lsme->lsme_extent.e_end;
2010         } else {
2011                 cl->cl_is_composite = false;
2012         }
2013
2014         rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
2015         lov_lsm_put(lsm);
2016
2017         RETURN(rc < 0 ? rc : 0);
2018 }
2019
2020 static loff_t lov_object_maxbytes(struct cl_object *obj)
2021 {
2022         struct lov_object *lov = cl2lov(obj);
2023         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2024         loff_t maxbytes;
2025
2026         if (lsm == NULL)
2027                 return LLONG_MAX;
2028
2029         maxbytes = lsm->lsm_maxbytes;
2030
2031         lov_lsm_put(lsm);
2032
2033         return maxbytes;
2034 }
2035
2036 static const struct cl_object_operations lov_ops = {
2037         .coo_page_init    = lov_page_init,
2038         .coo_lock_init    = lov_lock_init,
2039         .coo_io_init      = lov_io_init,
2040         .coo_attr_get     = lov_attr_get,
2041         .coo_attr_update  = lov_attr_update,
2042         .coo_conf_set     = lov_conf_set,
2043         .coo_getstripe    = lov_object_getstripe,
2044         .coo_layout_get   = lov_object_layout_get,
2045         .coo_maxbytes     = lov_object_maxbytes,
2046         .coo_fiemap       = lov_object_fiemap,
2047 };
2048
2049 static const struct lu_object_operations lov_lu_obj_ops = {
2050         .loo_object_init      = lov_object_init,
2051         .loo_object_delete    = lov_object_delete,
2052         .loo_object_release   = NULL,
2053         .loo_object_free      = lov_object_free,
2054         .loo_object_print     = lov_object_print,
2055         .loo_object_invariant = NULL
2056 };
2057
2058 struct lu_object *lov_object_alloc(const struct lu_env *env,
2059                                    const struct lu_object_header *unused,
2060                                    struct lu_device *dev)
2061 {
2062         struct lov_object *lov;
2063         struct lu_object  *obj;
2064
2065         ENTRY;
2066         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
2067         if (lov != NULL) {
2068                 obj = lov2lu(lov);
2069                 lu_object_init(obj, NULL, dev);
2070                 lov->lo_cl.co_ops = &lov_ops;
2071                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
2072                 /*
2073                  * object io operation vector (cl_object::co_iop) is installed
2074                  * later in lov_object_init(), as different vectors are used
2075                  * for object with different layouts.
2076                  */
2077                 obj->lo_ops = &lov_lu_obj_ops;
2078         } else
2079                 obj = NULL;
2080         RETURN(obj);
2081 }
2082
2083 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
2084 {
2085         struct lov_stripe_md *lsm = NULL;
2086
2087         lov_conf_freeze(lov);
2088         if (lov->lo_lsm != NULL) {
2089                 lsm = lsm_addref(lov->lo_lsm);
2090                 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
2091                         lsm, atomic_read(&lsm->lsm_refc),
2092                         lov->lo_layout_invalid, current);
2093         }
2094         lov_conf_thaw(lov);
2095         return lsm;
2096 }
2097
2098 int lov_read_and_clear_async_rc(struct cl_object *clob)
2099 {
2100         struct lu_object *luobj;
2101         int rc = 0;
2102         ENTRY;
2103
2104         luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
2105                                  &lov_device_type);
2106         if (luobj != NULL) {
2107                 struct lov_object *lov = lu2lov(luobj);
2108
2109                 lov_conf_freeze(lov);
2110                 switch (lov->lo_type) {
2111                 case LLT_COMP: {
2112                         struct lov_stripe_md *lsm;
2113                         int i;
2114
2115                         lsm = lov->lo_lsm;
2116                         LASSERT(lsm != NULL);
2117                         for (i = 0; i < lsm->lsm_entry_count; i++) {
2118                                 struct lov_stripe_md_entry *lse =
2119                                                 lsm->lsm_entries[i];
2120                                 int j;
2121
2122                                 if (!lsme_inited(lse))
2123                                         break;
2124
2125                                 for (j = 0; j < lse->lsme_stripe_count; j++) {
2126                                         struct lov_oinfo *loi =
2127                                                         lse->lsme_oinfo[j];
2128
2129                                         if (lov_oinfo_is_dummy(loi))
2130                                                 continue;
2131
2132                                         if (loi->loi_ar.ar_rc && !rc)
2133                                                 rc = loi->loi_ar.ar_rc;
2134                                         loi->loi_ar.ar_rc = 0;
2135                                 }
2136                         }
2137                 }
2138                 case LLT_RELEASED:
2139                 case LLT_EMPTY:
2140                         break;
2141                 default:
2142                         LBUG();
2143                 }
2144                 lov_conf_thaw(lov);
2145         }
2146         RETURN(rc);
2147 }
2148 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
2149
2150 /** @} lov */