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
 217         OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof(r0->lo_sub[0]));
 218         if (r0->lo_sub == NULL)
 219                 GOTO(out, result = -ENOMEM);
 220
 221         psz = 0;
 222         result = 0;
 223         memset(subconf, 0, sizeof(*subconf));
 224
 225         /*
 226          * Create stripe cl_objects.
 227          */
 228         for (i = 0; i < r0->lo_nr; ++i) {
 229                 struct cl_device *subdev;
 230                 struct lov_oinfo *oinfo = lse->lsme_oinfo[i];
 231                 int ost_idx = oinfo->loi_ost_idx;
 232
 233                 if (lov_oinfo_is_dummy(oinfo))
 234                         continue;
 235
 236                 result = ostid_to_fid(ofid, &oinfo->loi_oi, oinfo->loi_ost_idx);
 237                 if (result != 0)
 238                         GOTO(out, result);
 239
 240                 if (dev->ld_target[ost_idx] == NULL) {
 241                         CERROR("%s: OST %04x is not initialized\n",
 242                                lov2obd(dev->ld_lov)->obd_name, ost_idx);
 243                         GOTO(out, result = -EIO);
 244                 }
 245
 246                 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 247                 subconf->u.coc_oinfo = oinfo;
 248                 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
 249                 /* In the function below, .hs_keycmp resolves to
 250                  * lu_obj_hop_keycmp() */
 251                 /* coverity[overrun-buffer-val] */
 252                 stripe = lov_sub_find(env, subdev, ofid, subconf);
 253                 if (IS_ERR(stripe))
 254                         GOTO(out, result = PTR_ERR(stripe));
 255
 256                 result = lov_init_sub(env, lov, stripe, oinfo,
 257                                       lov_comp_index(index, i));
 258                 if (result == -EAGAIN) { /* try again */
 259                         --i;
 260                         result = 0;
 261                         continue;
 262                 }
 263
 264                 if (result == 0) {
 265                         r0->lo_sub[i] = cl2lovsub(stripe);
 266
 267                         sz = lov_page_slice_fixup(lov, stripe);
 268                         LASSERT(ergo(psz > 0, psz == sz));
 269                         psz = sz;
 270                 }
 271         }
 272         if (result == 0)
 273                 result = psz;
 274 out:
 275         RETURN(result);
 276 }
 277
 278 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
 279                                struct lov_layout_raid0 *r0,
 280                                struct lovsub_object *los, int idx)
 281 {
 282         struct cl_object        *sub;
 283         struct lu_site          *site;
 284         wait_queue_head_t *wq;
 285         wait_queue_entry_t *waiter;
 286
 287         LASSERT(r0->lo_sub[idx] == los);
 288
 289         sub = lovsub2cl(los);
 290         site = sub->co_lu.lo_dev->ld_site;
 291         wq = lu_site_wq_from_fid(site, &sub->co_lu.lo_header->loh_fid);
 292
 293         cl_object_kill(env, sub);
 294         /* release a reference to the sub-object and ... */
 295         lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
 296         cl_object_put(env, sub);
 297
 298         /* ... wait until it is actually destroyed---sub-object clears its
 299          * ->lo_sub[] slot in lovsub_object_free() */
 300         if (r0->lo_sub[idx] == los) {
 301                 waiter = &lov_env_info(env)->lti_waiter;
 302                 init_waitqueue_entry(waiter, current);
 303                 add_wait_queue(wq, waiter);
 304                 set_current_state(TASK_UNINTERRUPTIBLE);
 305                 while (1) {
 306                         /* this wait-queue is signaled at the end of
 307                          * lu_object_free(). */
 308                         set_current_state(TASK_UNINTERRUPTIBLE);
 309                         spin_lock(&r0->lo_sub_lock);
 310                         if (r0->lo_sub[idx] == los) {
 311                                 spin_unlock(&r0->lo_sub_lock);
 312                                 schedule();
 313                         } else {
 314                                 spin_unlock(&r0->lo_sub_lock);
 315                                 set_current_state(TASK_RUNNING);
 316                                 break;
 317                         }
 318                 }
 319                 remove_wait_queue(wq, waiter);
 320         }
 321         LASSERT(r0->lo_sub[idx] == NULL);
 322 }
 323
 324 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
 325                              struct lov_layout_entry *lle)
 326 {
 327         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 328
 329         ENTRY;
 330
 331         if (r0->lo_sub != NULL) {
 332                 int i;
 333
 334                 for (i = 0; i < r0->lo_nr; ++i) {
 335                         struct lovsub_object *los = r0->lo_sub[i];
 336
 337                         if (los != NULL) {
 338                                 cl_object_prune(env, &los->lso_cl);
 339                                 /*
 340                                  * If top-level object is to be evicted from
 341                                  * the cache, so are its sub-objects.
 342                                  */
 343                                 lov_subobject_kill(env, lov, r0, los, i);
 344                         }
 345                 }
 346         }
 347
 348         EXIT;
 349 }
 350
 351 static void lov_fini_raid0(const struct lu_env *env,
 352                            struct lov_layout_entry *lle)
 353 {
 354         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 355
 356         if (r0->lo_sub != NULL) {
 357                 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
 358                 r0->lo_sub = NULL;
 359         }
 360 }
 361
 362 static int lov_print_raid0(const struct lu_env *env, void *cookie,
 363                            lu_printer_t p, const struct lov_layout_entry *lle)
 364 {
 365         const struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 366         int i;
 367
 368         for (i = 0; i < r0->lo_nr; ++i) {
 369                 struct lu_object *sub;
 370
 371                 if (r0->lo_sub[i] != NULL) {
 372                         sub = lovsub2lu(r0->lo_sub[i]);
 373                         lu_object_print(env, cookie, p, sub);
 374                 } else {
 375                         (*p)(env, cookie, "sub %d absent\n", i);
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381 static int lov_attr_get_raid0(const struct lu_env *env, struct lov_object *lov,
 382                               unsigned int index, struct lov_layout_entry *lle,
 383                               struct cl_attr **lov_attr)
 384 {
 385         struct lov_layout_raid0 *r0 = &lle->lle_raid0;
 386         struct lov_stripe_md *lsm = lov->lo_lsm;
 387         struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
 388         struct cl_attr *attr = &r0->lo_attr;
 389         __u64 kms = 0;
 390         int result = 0;
 391
 392         if (r0->lo_attr_valid) {
 393                 *lov_attr = attr;
 394                 return 0;
 395         }
 396
 397         memset(lvb, 0, sizeof(*lvb));
 398
 399         /* XXX: timestamps can be negative by sanity:test_39m,
 400          * how can it be? */
 401         lvb->lvb_atime = LLONG_MIN;
 402         lvb->lvb_ctime = LLONG_MIN;
 403         lvb->lvb_mtime = LLONG_MIN;
 404
 405         /*
 406          * XXX that should be replaced with a loop over sub-objects,
 407          * doing cl_object_attr_get() on them. But for now, let's
 408          * reuse old lov code.
 409          */
 410
 411         /*
 412          * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
 413          * happy. It's not needed, because new code uses
 414          * ->coh_attr_guard spin-lock to protect consistency of
 415          * sub-object attributes.
 416          */
 417         lov_stripe_lock(lsm);
 418         result = lov_merge_lvb_kms(lsm, index, lvb, &kms);
 419         lov_stripe_unlock(lsm);
 420         if (result == 0) {
 421                 cl_lvb2attr(attr, lvb);
 422                 attr->cat_kms = kms;
 423                 r0->lo_attr_valid = 1;
 424                 *lov_attr = attr;
 425         }
 426
 427         return result;
 428 }
 429
 430 static struct lov_comp_layout_entry_ops raid0_ops = {
 431         .lco_init      = lov_init_raid0,
 432         .lco_fini      = lov_fini_raid0,
 433         .lco_getattr   = lov_attr_get_raid0,
 434 };
 435
 436 static int lov_attr_get_dom(const struct lu_env *env, struct lov_object *lov,
 437                             unsigned int index, struct lov_layout_entry *lle,
 438                             struct cl_attr **lov_attr)
 439 {
 440         struct lov_layout_dom *dom = &lle->lle_dom;
 441         struct lov_oinfo *loi = dom->lo_loi;
 442         struct cl_attr *attr = &dom->lo_dom_r0.lo_attr;
 443
 444         if (dom->lo_dom_r0.lo_attr_valid) {
 445                 *lov_attr = attr;
 446                 return 0;
 447         }
 448
 449         if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks))
 450                 return OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
 451
 452         cl_lvb2attr(attr, &loi->loi_lvb);
 453
 454         /* DoM component size can be bigger than stripe size after
 455          * client's setattr RPC, so do not count anything beyond
 456          * component end. Alternatively, check that limit on server
 457          * and do not allow size overflow there. */
 458         if (attr->cat_size > lle->lle_extent->e_end)
 459                 attr->cat_size = lle->lle_extent->e_end;
 460
 461         attr->cat_kms = attr->cat_size;
 462
 463         dom->lo_dom_r0.lo_attr_valid = 1;
 464         *lov_attr = attr;
 465
 466         return 0;
 467 }
 468
 469 /**
 470  * Lookup FLD to get MDS index of the given DOM object FID.
 471  *
 472  * \param[in]  ld       LOV device
 473  * \param[in]  fid      FID to lookup
 474  * \param[out] nr       index in MDC array to return back
 475  *
 476  * \retval              0 and \a mds filled with MDS index if successful
 477  * \retval              negative value on error
 478  */
 479 static int lov_fld_lookup(struct lov_device *ld, const struct lu_fid *fid,
 480                           __u32 *nr)
 481 {
 482         __u32 mds_idx;
 483         int i, rc;
 484
 485         ENTRY;
 486
 487         rc = fld_client_lookup(&ld->ld_lmv->u.lmv.lmv_fld, fid_seq(fid),
 488                                &mds_idx, LU_SEQ_RANGE_MDT, NULL);
 489         if (rc) {
 490                 CERROR("%s: error while looking for mds number. Seq %#llx"
 491                        ", err = %d\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 492                        fid_seq(fid), rc);
 493                 RETURN(rc);
 494         }
 495
 496         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
 497                mds_idx, PFID(fid));
 498
 499         /* find proper MDC device in the array */
 500         for (i = 0; i < ld->ld_md_tgts_nr; i++) {
 501                 if (ld->ld_md_tgts[i].ldm_mdc != NULL &&
 502                     ld->ld_md_tgts[i].ldm_idx == mds_idx)
 503                         break;
 504         }
 505
 506         if (i == ld->ld_md_tgts_nr) {
 507                 CERROR("%s: cannot find corresponding MDC device for mds #%x "
 508                        "for fid="DFID"\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
 509                        mds_idx, PFID(fid));
 510                 rc = -EINVAL;
 511         } else {
 512                 *nr = i;
 513         }
 514         RETURN(rc);
 515 }
 516
 517 /**
 518  * Implementation of lov_comp_layout_entry_ops::lco_init for DOM object.
 519  *
 520  * Init the DOM object for the first time. It prepares also RAID0 entry
 521  * for it to use in common methods with ordinary RAID0 layout entries.
 522  *
 523  * \param[in] env       execution environment
 524  * \param[in] dev       LOV device
 525  * \param[in] lov       LOV object
 526  * \param[in] index     Composite layout entry index in LSM
 527  * \param[in] lle       Composite LOV layout entry
 528  */
 529 static int lov_init_dom(const struct lu_env *env, struct lov_device *dev,
 530                         struct lov_object *lov, unsigned int index,
 531                         const struct cl_object_conf *conf,
 532                         struct lov_layout_entry *lle)
 533 {
 534         struct lov_thread_info *lti = lov_env_info(env);
 535         struct lov_stripe_md_entry *lsme = lov_lse(lov, index);
 536         struct cl_object *clo;
 537         struct lu_object *o = lov2lu(lov);
 538         const struct lu_fid *fid = lu_object_fid(o);
 539         struct cl_device *mdcdev;
 540         struct lov_oinfo *loi = NULL;
 541         struct cl_object_conf *sconf = &lti->lti_stripe_conf;
 542
 543         int rc;
 544         __u32 idx = 0;
 545
 546         ENTRY;
 547
 548         LASSERT(index == 0);
 549
 550         /* find proper MDS device */
 551         rc = lov_fld_lookup(dev, fid, &idx);
 552         if (rc)
 553                 RETURN(rc);
 554
 555         LASSERTF(dev->ld_md_tgts[idx].ldm_mdc != NULL,
 556                  "LOV md target[%u] is NULL\n", idx);
 557
 558         /* check lsm is DOM, more checks are needed */
 559         LASSERT(lsme->lsme_stripe_count == 0);
 560
 561         /*
 562          * Create lower cl_objects.
 563          */
 564         mdcdev = dev->ld_md_tgts[idx].ldm_mdc;
 565
 566         LASSERTF(mdcdev != NULL, "non-initialized mdc subdev\n");
 567
 568         /* DoM object has no oinfo in LSM entry, create it exclusively */
 569         OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 570         if (loi == NULL)
 571                 RETURN(-ENOMEM);
 572
 573         fid_to_ostid(lu_object_fid(lov2lu(lov)), &loi->loi_oi);
 574
 575         sconf->u.coc_oinfo = loi;
 576 again:
 577         clo = lov_sub_find(env, mdcdev, fid, sconf);
 578         if (IS_ERR(clo))
 579                 GOTO(out, rc = PTR_ERR(clo));
 580
 581         rc = lov_init_sub(env, lov, clo, loi, lov_comp_index(index, 0));
 582         if (rc == -EAGAIN) /* try again */
 583                 goto again;
 584         else if (rc != 0)
 585                 GOTO(out, rc);
 586
 587         lle->lle_dom.lo_dom = cl2lovsub(clo);
 588         spin_lock_init(&lle->lle_dom.lo_dom_r0.lo_sub_lock);
 589         lle->lle_dom.lo_dom_r0.lo_nr = 1;
 590         lle->lle_dom.lo_dom_r0.lo_sub = &lle->lle_dom.lo_dom;
 591         lle->lle_dom.lo_loi = loi;
 592
 593         rc = lov_page_slice_fixup(lov, clo);
 594         RETURN(rc);
 595
 596 out:
 597         if (loi != NULL)
 598                 OBD_SLAB_FREE_PTR(loi, lov_oinfo_slab);
 599         return rc;
 600 }
 601
 602 /**
 603  * Implementation of lov_layout_operations::llo_fini for DOM object.
 604  *
 605  * Finish the DOM object and free related memory.
 606  *
 607  * \param[in] env       execution environment
 608  * \param[in] lov       LOV object
 609  * \param[in] state     LOV layout state
 610  */
 611 static void lov_fini_dom(const struct lu_env *env,
 612                          struct lov_layout_entry *lle)
 613 {
 614         if (lle->lle_dom.lo_dom != NULL)
 615                 lle->lle_dom.lo_dom = NULL;
 616         if (lle->lle_dom.lo_loi != NULL)
 617                 OBD_SLAB_FREE_PTR(lle->lle_dom.lo_loi, lov_oinfo_slab);
 618 }
 619
 620 static struct lov_comp_layout_entry_ops dom_ops = {
 621         .lco_init = lov_init_dom,
 622         .lco_fini = lov_fini_dom,
 623         .lco_getattr = lov_attr_get_dom,
 624 };
 625
 626 static int lov_init_composite(const struct lu_env *env, struct lov_device *dev,
 627                               struct lov_object *lov, struct lov_stripe_md *lsm,
 628                               const struct cl_object_conf *conf,
 629                               union lov_layout_state *state)
 630 {
 631         struct lov_layout_composite *comp = &state->composite;
 632         struct lov_layout_entry *lle;
 633         struct lov_mirror_entry *lre;
 634         unsigned int entry_count;
 635         unsigned int psz = 0;
 636         unsigned int mirror_count;
 637         int flr_state = lsm->lsm_flags & LCM_FL_FLR_MASK;
 638         int result = 0;
 639         unsigned int seq;
 640         int i, j;
 641
 642         ENTRY;
 643
 644         LASSERT(lsm->lsm_entry_count > 0);
 645         LASSERT(lov->lo_lsm == NULL);
 646         lov->lo_lsm = lsm_addref(lsm);
 647         lov->lo_layout_invalid = true;
 648
 649         dump_lsm(D_INODE, lsm);
 650
 651         entry_count = lsm->lsm_entry_count;
 652
 653         spin_lock_init(&comp->lo_write_lock);
 654         comp->lo_flags = lsm->lsm_flags;
 655         comp->lo_mirror_count = lsm->lsm_mirror_count + 1;
 656         comp->lo_entry_count = lsm->lsm_entry_count;
 657         comp->lo_preferred_mirror = -1;
 658
 659         if (equi(flr_state == LCM_FL_NONE, comp->lo_mirror_count > 1))
 660                 RETURN(-EINVAL);
 661
 662         OBD_ALLOC(comp->lo_mirrors,
 663                   comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 664         if (comp->lo_mirrors == NULL)
 665                 RETURN(-ENOMEM);
 666
 667         OBD_ALLOC(comp->lo_entries, entry_count * sizeof(*comp->lo_entries));
 668         if (comp->lo_entries == NULL)
 669                 RETURN(-ENOMEM);
 670
 671         /* Initiate all entry types and extents data at first */
 672         for (i = 0, j = 0, mirror_count = 1; i < entry_count; i++) {
 673                 int mirror_id = 0;
 674
 675                 lle = &comp->lo_entries[i];
 676
 677                 lle->lle_lsme = lsm->lsm_entries[i];
 678                 lle->lle_type = lov_entry_type(lle->lle_lsme);
 679                 switch (lle->lle_type) {
 680                 case LOV_PATTERN_RAID0:
 681                         lle->lle_comp_ops = &raid0_ops;
 682                         break;
 683                 case LOV_PATTERN_MDT:
 684                         lle->lle_comp_ops = &dom_ops;
 685                         break;
 686                 default:
 687                         CERROR("%s: unknown composite layout entry type %i\n",
 688                                lov2obd(dev->ld_lov)->obd_name,
 689                                lsm->lsm_entries[i]->lsme_pattern);
 690                         dump_lsm(D_ERROR, lsm);
 691                         RETURN(-EIO);
 692                 }
 693
 694                 lle->lle_extent = &lle->lle_lsme->lsme_extent;
 695                 lle->lle_valid = !(lle->lle_lsme->lsme_flags & LCME_FL_STALE);
 696
 697                 if (flr_state != LCM_FL_NONE)
 698                         mirror_id = mirror_id_of(lle->lle_lsme->lsme_id);
 699
 700                 lre = &comp->lo_mirrors[j];
 701                 if (i > 0) {
 702                         if (mirror_id == lre->lre_mirror_id) {
 703                                 lre->lre_valid |= lle->lle_valid;
 704                                 lre->lre_stale |= !lle->lle_valid;
 705                                 lre->lre_end = i;
 706                                 continue;
 707                         }
 708
 709                         /* new mirror detected, assume that the mirrors
 710                          * are shorted in layout */
 711                         ++mirror_count;
 712                         ++j;
 713                         if (j >= comp->lo_mirror_count)
 714                                 break;
 715
 716                         lre = &comp->lo_mirrors[j];
 717                 }
 718
 719                 /* entries must be sorted by mirrors */
 720                 lre->lre_mirror_id = mirror_id;
 721                 lre->lre_start = lre->lre_end = i;
 722                 lre->lre_preferred = !!(lle->lle_lsme->lsme_flags &
 723                                         LCME_FL_PREF_RD);
 724                 lre->lre_valid = lle->lle_valid;
 725                 lre->lre_stale = !lle->lle_valid;
 726         }
 727
 728         /* sanity check for FLR */
 729         if (mirror_count != comp->lo_mirror_count) {
 730                 CDEBUG(D_INODE, DFID
 731                        " doesn't have the # of mirrors it claims, %u/%u\n",
 732                        PFID(lu_object_fid(lov2lu(lov))), mirror_count,
 733                        comp->lo_mirror_count + 1);
 734
 735                 GOTO(out, result = -EINVAL);
 736         }
 737
 738         lov_foreach_layout_entry(lov, lle) {
 739                 int index = lov_layout_entry_index(lov, lle);
 740
 741                 /**
 742                  * If the component has not been init-ed on MDS side, for
 743                  * PFL layout, we'd know that the components beyond this one
 744                  * will be dynamically init-ed later on file write/trunc ops.
 745                  */
 746                 if (!lsme_inited(lle->lle_lsme))
 747                         continue;
 748
 749                 result = lle->lle_comp_ops->lco_init(env, dev, lov, index,
 750                                                      conf, lle);
 751                 if (result < 0)
 752                         break;
 753
 754                 LASSERT(ergo(psz > 0, psz == result));
 755                 psz = result;
 756         }
 757
 758         if (psz > 0)
 759                 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
 760
 761         /* decide the preferred mirror. It uses the hash value of lov_object
 762          * so that different clients would use different mirrors for read. */
 763         mirror_count = 0;
 764         seq = hash_long((unsigned long)lov, 8);
 765         for (i = 0; i < comp->lo_mirror_count; i++) {
 766                 unsigned int idx = (i + seq) % comp->lo_mirror_count;
 767
 768                 lre = lov_mirror_entry(lov, idx);
 769                 if (lre->lre_stale)
 770                         continue;
 771
 772                 mirror_count++; /* valid mirror */
 773
 774                 if (lre->lre_preferred || comp->lo_preferred_mirror < 0)
 775                         comp->lo_preferred_mirror = idx;
 776         }
 777         if (!mirror_count) {
 778                 CDEBUG(D_INODE, DFID
 779                        " doesn't have any valid mirrors\n",
 780                        PFID(lu_object_fid(lov2lu(lov))));
 781
 782                 comp->lo_preferred_mirror = 0;
 783         }
 784
 785         LASSERT(comp->lo_preferred_mirror >= 0);
 786
 787         EXIT;
 788 out:
 789         return result > 0 ? 0 : result;
 790 }
 791
 792 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
 793                           struct lov_object *lov, struct lov_stripe_md *lsm,
 794                           const struct cl_object_conf *conf,
 795                           union lov_layout_state *state)
 796 {
 797         return 0;
 798 }
 799
 800 static int lov_init_released(const struct lu_env *env,
 801                              struct lov_device *dev, struct lov_object *lov,
 802                              struct lov_stripe_md *lsm,
 803                              const struct cl_object_conf *conf,
 804                              union lov_layout_state *state)
 805 {
 806         LASSERT(lsm != NULL);
 807         LASSERT(lsm->lsm_is_released);
 808         LASSERT(lov->lo_lsm == NULL);
 809
 810         lov->lo_lsm = lsm_addref(lsm);
 811         return 0;
 812 }
 813
 814 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 815                             union lov_layout_state *state)
 816 {
 817         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 818
 819         lov_layout_wait(env, lov);
 820         return 0;
 821 }
 822
 823 static int lov_delete_composite(const struct lu_env *env,
 824                                 struct lov_object *lov,
 825                                 union lov_layout_state *state)
 826 {
 827         struct lov_layout_entry *entry;
 828         struct lov_layout_composite *comp = &state->composite;
 829
 830         ENTRY;
 831
 832         dump_lsm(D_INODE, lov->lo_lsm);
 833
 834         lov_layout_wait(env, lov);
 835         if (comp->lo_entries)
 836                 lov_foreach_layout_entry(lov, entry)
 837                         lov_delete_raid0(env, lov, entry);
 838
 839         RETURN(0);
 840 }
 841
 842 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
 843                            union lov_layout_state *state)
 844 {
 845         LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
 846 }
 847
 848 static void lov_fini_composite(const struct lu_env *env,
 849                                struct lov_object *lov,
 850                                union lov_layout_state *state)
 851 {
 852         struct lov_layout_composite *comp = &state->composite;
 853         ENTRY;
 854
 855         if (comp->lo_entries != NULL) {
 856                 struct lov_layout_entry *entry;
 857
 858                 lov_foreach_layout_entry(lov, entry)
 859                         entry->lle_comp_ops->lco_fini(env, entry);
 860
 861                 OBD_FREE(comp->lo_entries,
 862                          comp->lo_entry_count * sizeof(*comp->lo_entries));
 863                 comp->lo_entries = NULL;
 864         }
 865
 866         if (comp->lo_mirrors != NULL) {
 867                 OBD_FREE(comp->lo_mirrors,
 868                          comp->lo_mirror_count * sizeof(*comp->lo_mirrors));
 869                 comp->lo_mirrors = NULL;
 870         }
 871
 872         memset(comp, 0, sizeof(*comp));
 873
 874         dump_lsm(D_INODE, lov->lo_lsm);
 875         lov_free_memmd(&lov->lo_lsm);
 876
 877         EXIT;
 878 }
 879
 880 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
 881                                 union lov_layout_state *state)
 882 {
 883         ENTRY;
 884         dump_lsm(D_INODE, lov->lo_lsm);
 885         lov_free_memmd(&lov->lo_lsm);
 886         EXIT;
 887 }
 888
 889 static int lov_print_empty(const struct lu_env *env, void *cookie,
 890                            lu_printer_t p, const struct lu_object *o)
 891 {
 892         (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
 893         return 0;
 894 }
 895
 896 static int lov_print_composite(const struct lu_env *env, void *cookie,
 897                                lu_printer_t p, const struct lu_object *o)
 898 {
 899         struct lov_object *lov = lu2lov(o);
 900         struct lov_stripe_md *lsm = lov->lo_lsm;
 901         int i;
 902
 903         (*p)(env, cookie, "entries: %d, %s, lsm{%p 0x%08X %d %u}:\n",
 904              lsm->lsm_entry_count,
 905              lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 906              lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 907              lsm->lsm_layout_gen);
 908
 909         for (i = 0; i < lsm->lsm_entry_count; i++) {
 910                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 911                 struct lov_layout_entry *lle = lov_entry(lov, i);
 912
 913                 (*p)(env, cookie,
 914                      DEXT ": { 0x%08X, %u, %#x, %u, %#x, %u, %u }\n",
 915                      PEXT(&lse->lsme_extent), lse->lsme_magic,
 916                      lse->lsme_id, lse->lsme_pattern, lse->lsme_layout_gen,
 917                      lse->lsme_flags, lse->lsme_stripe_count,
 918                      lse->lsme_stripe_size);
 919                 lov_print_raid0(env, cookie, p, lle);
 920         }
 921
 922         return 0;
 923 }
 924
 925 static int lov_print_released(const struct lu_env *env, void *cookie,
 926                                 lu_printer_t p, const struct lu_object *o)
 927 {
 928         struct lov_object       *lov = lu2lov(o);
 929         struct lov_stripe_md    *lsm = lov->lo_lsm;
 930
 931         (*p)(env, cookie,
 932                 "released: %s, lsm{%p 0x%08X %d %u}:\n",
 933                 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
 934                 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
 935                 lsm->lsm_layout_gen);
 936         return 0;
 937 }
 938
 939 /**
 940  * Implements cl_object_operations::coo_attr_get() method for an object
 941  * without stripes (LLT_EMPTY layout type).
 942  *
 943  * The only attributes this layer is authoritative in this case is
 944  * cl_attr::cat_blocks---it's 0.
 945  */
 946 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
 947                               struct cl_attr *attr)
 948 {
 949         attr->cat_blocks = 0;
 950         return 0;
 951 }
 952
 953 static int lov_attr_get_composite(const struct lu_env *env,
 954                                   struct cl_object *obj,
 955                                   struct cl_attr *attr)
 956 {
 957         struct lov_object       *lov = cl2lov(obj);
 958         struct lov_layout_entry *entry;
 959         int                      result = 0;
 960
 961         ENTRY;
 962
 963         attr->cat_size = 0;
 964         attr->cat_blocks = 0;
 965         lov_foreach_layout_entry(lov, entry) {
 966                 struct cl_attr *lov_attr = NULL;
 967                 int index = lov_layout_entry_index(lov, entry);
 968
 969                 if (!entry->lle_valid)
 970                         continue;
 971
 972                 /* PFL: This component has not been init-ed. */
 973                 if (!lsm_entry_inited(lov->lo_lsm, index))
 974                         continue;
 975
 976                 result = entry->lle_comp_ops->lco_getattr(env, lov, index,
 977                                                           entry, &lov_attr);
 978                 if (result < 0)
 979                         RETURN(result);
 980
 981                 if (lov_attr == NULL)
 982                         continue;
 983
 984                 CDEBUG(D_INODE, "COMP ID #%i: s=%llu m=%llu a=%llu c=%llu "
 985                        "b=%llu\n", index - 1, lov_attr->cat_size,
 986                        lov_attr->cat_mtime, lov_attr->cat_atime,
 987                        lov_attr->cat_ctime, lov_attr->cat_blocks);
 988
 989                 /* merge results */
 990                 attr->cat_blocks += lov_attr->cat_blocks;
 991                 if (attr->cat_size < lov_attr->cat_size)
 992                         attr->cat_size = lov_attr->cat_size;
 993                 if (attr->cat_kms < lov_attr->cat_kms)
 994                         attr->cat_kms = lov_attr->cat_kms;
 995                 if (attr->cat_atime < lov_attr->cat_atime)
 996                         attr->cat_atime = lov_attr->cat_atime;
 997                 if (attr->cat_ctime < lov_attr->cat_ctime)
 998                         attr->cat_ctime = lov_attr->cat_ctime;
 999                 if (attr->cat_mtime < lov_attr->cat_mtime)
1000                         attr->cat_mtime = lov_attr->cat_mtime;
1001         }
1002
1003         RETURN(0);
1004 }
1005
1006 const static struct lov_layout_operations lov_dispatch[] = {
1007         [LLT_EMPTY] = {
1008                 .llo_init      = lov_init_empty,
1009                 .llo_delete    = lov_delete_empty,
1010                 .llo_fini      = lov_fini_empty,
1011                 .llo_print     = lov_print_empty,
1012                 .llo_page_init = lov_page_init_empty,
1013                 .llo_lock_init = lov_lock_init_empty,
1014                 .llo_io_init   = lov_io_init_empty,
1015                 .llo_getattr   = lov_attr_get_empty,
1016         },
1017         [LLT_RELEASED] = {
1018                 .llo_init      = lov_init_released,
1019                 .llo_delete    = lov_delete_empty,
1020                 .llo_fini      = lov_fini_released,
1021                 .llo_print     = lov_print_released,
1022                 .llo_page_init = lov_page_init_empty,
1023                 .llo_lock_init = lov_lock_init_empty,
1024                 .llo_io_init   = lov_io_init_released,
1025                 .llo_getattr   = lov_attr_get_empty,
1026         },
1027         [LLT_COMP] = {
1028                 .llo_init      = lov_init_composite,
1029                 .llo_delete    = lov_delete_composite,
1030                 .llo_fini      = lov_fini_composite,
1031                 .llo_print     = lov_print_composite,
1032                 .llo_page_init = lov_page_init_composite,
1033                 .llo_lock_init = lov_lock_init_composite,
1034                 .llo_io_init   = lov_io_init_composite,
1035                 .llo_getattr   = lov_attr_get_composite,
1036         },
1037 };
1038
1039 /**
1040  * Performs a double-dispatch based on the layout type of an object.
1041  */
1042 #define LOV_2DISPATCH_NOLOCK(obj, op, ...)              \
1043 ({                                                      \
1044         struct lov_object *__obj = (obj);               \
1045         enum lov_layout_type __llt;                     \
1046                                                         \
1047         __llt = __obj->lo_type;                         \
1048         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));      \
1049         lov_dispatch[__llt].op(__VA_ARGS__);            \
1050 })
1051
1052 /**
1053  * Return lov_layout_type associated with a given lsm
1054  */
1055 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
1056 {
1057         if (lsm == NULL)
1058                 return LLT_EMPTY;
1059
1060         if (lsm->lsm_is_released)
1061                 return LLT_RELEASED;
1062
1063         if (lsm->lsm_magic == LOV_MAGIC_V1 ||
1064             lsm->lsm_magic == LOV_MAGIC_V3 ||
1065             lsm->lsm_magic == LOV_MAGIC_COMP_V1)
1066                 return LLT_COMP;
1067
1068         return LLT_EMPTY;
1069 }
1070
1071 static inline void lov_conf_freeze(struct lov_object *lov)
1072 {
1073         CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
1074                 lov, lov->lo_owner, current);
1075         if (lov->lo_owner != current)
1076                 down_read(&lov->lo_type_guard);
1077 }
1078
1079 static inline void lov_conf_thaw(struct lov_object *lov)
1080 {
1081         CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
1082                 lov, lov->lo_owner, current);
1083         if (lov->lo_owner != current)
1084                 up_read(&lov->lo_type_guard);
1085 }
1086
1087 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...)                       \
1088 ({                                                                      \
1089         struct lov_object                      *__obj = (obj);          \
1090         int                                     __lock = !!(lock);      \
1091         typeof(lov_dispatch[0].op(__VA_ARGS__)) __result;               \
1092                                                                         \
1093         if (__lock)                                                     \
1094                 lov_conf_freeze(__obj);                                 \
1095         __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__);          \
1096         if (__lock)                                                     \
1097                 lov_conf_thaw(__obj);                                   \
1098         __result;                                                       \
1099 })
1100
1101 /**
1102  * Performs a locked double-dispatch based on the layout type of an object.
1103  */
1104 #define LOV_2DISPATCH(obj, op, ...)                     \
1105         LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
1106
1107 #define LOV_2DISPATCH_VOID(obj, op, ...)                                \
1108 do {                                                                    \
1109         struct lov_object                      *__obj = (obj);          \
1110         enum lov_layout_type                    __llt;                  \
1111                                                                         \
1112         lov_conf_freeze(__obj);                                         \
1113         __llt = __obj->lo_type;                                         \
1114         LASSERT(__llt < ARRAY_SIZE(lov_dispatch));                      \
1115         lov_dispatch[__llt].op(__VA_ARGS__);                            \
1116         lov_conf_thaw(__obj);                                           \
1117 } while (0)
1118
1119 static void lov_conf_lock(struct lov_object *lov)
1120 {
1121         LASSERT(lov->lo_owner != current);
1122         down_write(&lov->lo_type_guard);
1123         LASSERT(lov->lo_owner == NULL);
1124         lov->lo_owner = current;
1125         CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
1126                 lov, lov->lo_owner);
1127 }
1128
1129 static void lov_conf_unlock(struct lov_object *lov)
1130 {
1131         CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
1132                 lov, lov->lo_owner);
1133         lov->lo_owner = NULL;
1134         up_write(&lov->lo_type_guard);
1135 }
1136
1137 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
1138 {
1139         struct l_wait_info lwi = { 0 };
1140         ENTRY;
1141
1142         while (atomic_read(&lov->lo_active_ios) > 0) {
1143                 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
1144                         PFID(lu_object_fid(lov2lu(lov))),
1145                         atomic_read(&lov->lo_active_ios));
1146
1147                 l_wait_event(lov->lo_waitq,
1148                              atomic_read(&lov->lo_active_ios) == 0, &lwi);
1149         }
1150         RETURN(0);
1151 }
1152
1153 static int lov_layout_change(const struct lu_env *unused,
1154                              struct lov_object *lov, struct lov_stripe_md *lsm,
1155                              const struct cl_object_conf *conf)
1156 {
1157         enum lov_layout_type llt = lov_type(lsm);
1158         union lov_layout_state *state = &lov->u;
1159         const struct lov_layout_operations *old_ops;
1160         const struct lov_layout_operations *new_ops;
1161         struct lov_device *lov_dev = lov_object_dev(lov);
1162         struct lu_env *env;
1163         __u16 refcheck;
1164         int rc;
1165         ENTRY;
1166
1167         LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch));
1168
1169         env = cl_env_get(&refcheck);
1170         if (IS_ERR(env))
1171                 RETURN(PTR_ERR(env));
1172
1173         LASSERT(llt < ARRAY_SIZE(lov_dispatch));
1174
1175         CDEBUG(D_INODE, DFID" from %s to %s\n",
1176                PFID(lu_object_fid(lov2lu(lov))),
1177                llt2str(lov->lo_type), llt2str(llt));
1178
1179         old_ops = &lov_dispatch[lov->lo_type];
1180         new_ops = &lov_dispatch[llt];
1181
1182         rc = cl_object_prune(env, &lov->lo_cl);
1183         if (rc != 0)
1184                 GOTO(out, rc);
1185
1186         rc = old_ops->llo_delete(env, lov, &lov->u);
1187         if (rc != 0)
1188                 GOTO(out, rc);
1189
1190         old_ops->llo_fini(env, lov, &lov->u);
1191
1192         LASSERT(atomic_read(&lov->lo_active_ios) == 0);
1193
1194         CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
1195                PFID(lu_object_fid(lov2lu(lov))), lov, llt);
1196
1197         /* page bufsize fixup */
1198         cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
1199                 lov_page_slice_fixup(lov, NULL);
1200
1201         lov->lo_type = llt;
1202         rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
1203         if (rc != 0) {
1204                 struct obd_device *obd = lov2obd(lov_dev->ld_lov);
1205
1206                 CERROR("%s: cannot apply new layout on "DFID" : rc = %d\n",
1207                        obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
1208                 new_ops->llo_delete(env, lov, state);
1209                 new_ops->llo_fini(env, lov, state);
1210                 /* this file becomes an EMPTY file. */
1211                 lov->lo_type = LLT_EMPTY;
1212                 GOTO(out, rc);
1213         }
1214
1215 out:
1216         cl_env_put(env, &refcheck);
1217         RETURN(rc);
1218 }
1219
1220 /*****************************************************************************
1221  *
1222  * Lov object operations.
1223  *
1224  */
1225 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
1226                     const struct lu_object_conf *conf)
1227 {
1228         struct lov_object            *lov   = lu2lov(obj);
1229         struct lov_device            *dev   = lov_object_dev(lov);
1230         const struct cl_object_conf  *cconf = lu2cl_conf(conf);
1231         union lov_layout_state       *set   = &lov->u;
1232         const struct lov_layout_operations *ops;
1233         struct lov_stripe_md *lsm = NULL;
1234         int rc;
1235         ENTRY;
1236
1237         init_rwsem(&lov->lo_type_guard);
1238         atomic_set(&lov->lo_active_ios, 0);
1239         init_waitqueue_head(&lov->lo_waitq);
1240         cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
1241
1242         lov->lo_type = LLT_EMPTY;
1243         if (cconf->u.coc_layout.lb_buf != NULL) {
1244                 lsm = lov_unpackmd(dev->ld_lov,
1245                                    cconf->u.coc_layout.lb_buf,
1246                                    cconf->u.coc_layout.lb_len);
1247                 if (IS_ERR(lsm))
1248                         RETURN(PTR_ERR(lsm));
1249
1250                 dump_lsm(D_INODE, lsm);
1251         }
1252
1253         /* no locking is necessary, as object is being created */
1254         lov->lo_type = lov_type(lsm);
1255         ops = &lov_dispatch[lov->lo_type];
1256         rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
1257         if (rc != 0)
1258                 GOTO(out_lsm, rc);
1259
1260 out_lsm:
1261         lov_lsm_put(lsm);
1262
1263         RETURN(rc);
1264 }
1265
1266 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
1267                         const struct cl_object_conf *conf)
1268 {
1269         struct lov_stripe_md    *lsm = NULL;
1270         struct lov_object       *lov = cl2lov(obj);
1271         int                      result = 0;
1272         ENTRY;
1273
1274         if (conf->coc_opc == OBJECT_CONF_SET &&
1275             conf->u.coc_layout.lb_buf != NULL) {
1276                 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
1277                                    conf->u.coc_layout.lb_buf,
1278                                    conf->u.coc_layout.lb_len);
1279                 if (IS_ERR(lsm))
1280                         RETURN(PTR_ERR(lsm));
1281                 dump_lsm(D_INODE, lsm);
1282         }
1283
1284         lov_conf_lock(lov);
1285         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
1286                 lov->lo_layout_invalid = true;
1287                 GOTO(out, result = 0);
1288         }
1289
1290         if (conf->coc_opc == OBJECT_CONF_WAIT) {
1291                 if (lov->lo_layout_invalid &&
1292                     atomic_read(&lov->lo_active_ios) > 0) {
1293                         lov_conf_unlock(lov);
1294                         result = lov_layout_wait(env, lov);
1295                         lov_conf_lock(lov);
1296                 }
1297                 GOTO(out, result);
1298         }
1299
1300         LASSERT(conf->coc_opc == OBJECT_CONF_SET);
1301
1302         if ((lsm == NULL && lov->lo_lsm == NULL) ||
1303             ((lsm != NULL && lov->lo_lsm != NULL) &&
1304              (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
1305              (lov->lo_lsm->lsm_entries[0]->lsme_pattern ==
1306               lsm->lsm_entries[0]->lsme_pattern))) {
1307                 /* same version of layout */
1308                 lov->lo_layout_invalid = false;
1309                 GOTO(out, result = 0);
1310         }
1311
1312         /* will change layout - check if there still exists active IO. */
1313         if (atomic_read(&lov->lo_active_ios) > 0) {
1314                 lov->lo_layout_invalid = true;
1315                 GOTO(out, result = -EBUSY);
1316         }
1317
1318         result = lov_layout_change(env, lov, lsm, conf);
1319         lov->lo_layout_invalid = result != 0;
1320         EXIT;
1321
1322 out:
1323         lov_conf_unlock(lov);
1324         lov_lsm_put(lsm);
1325         CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
1326                PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
1327         RETURN(result);
1328 }
1329
1330 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
1331 {
1332         struct lov_object *lov = lu2lov(obj);
1333
1334         ENTRY;
1335         LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
1336         EXIT;
1337 }
1338
1339 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
1340 {
1341         struct lov_object *lov = lu2lov(obj);
1342
1343         ENTRY;
1344         LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
1345         lu_object_fini(obj);
1346         OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
1347         EXIT;
1348 }
1349
1350 static int lov_object_print(const struct lu_env *env, void *cookie,
1351                             lu_printer_t p, const struct lu_object *o)
1352 {
1353         return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
1354 }
1355
1356 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
1357                   struct cl_page *page, pgoff_t index)
1358 {
1359         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
1360                                     index);
1361 }
1362
1363 /**
1364  * Implements cl_object_operations::clo_io_init() method for lov
1365  * layer. Dispatches to the appropriate layout io initialization method.
1366  */
1367 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
1368                 struct cl_io *io)
1369 {
1370         CL_IO_SLICE_CLEAN(lov_env_io(env), lis_preserved);
1371
1372         CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
1373                PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
1374                io->ci_ignore_layout, io->ci_verify_layout);
1375
1376         /* IO type CIT_MISC with ci_ignore_layout set are usually invoked from
1377          * the OSC layer. It shouldn't take lov layout conf lock in that case,
1378          * because as long as the OSC object exists, the layout can't be
1379          * reconfigured. */
1380         return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
1381                         !(io->ci_ignore_layout && io->ci_type == CIT_MISC),
1382                         env, obj, io);
1383 }
1384
1385 /**
1386  * An implementation of cl_object_operations::clo_attr_get() method for lov
1387  * layer. For raid0 layout this collects and merges attributes of all
1388  * sub-objects.
1389  */
1390 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
1391                         struct cl_attr *attr)
1392 {
1393         /* do not take lock, as this function is called under a
1394          * spin-lock. Layout is protected from changing by ongoing IO. */
1395         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
1396 }
1397
1398 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1399                            const struct cl_attr *attr, unsigned valid)
1400 {
1401         /*
1402          * No dispatch is required here, as no layout implements this.
1403          */
1404         return 0;
1405 }
1406
1407 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1408                   struct cl_lock *lock, const struct cl_io *io)
1409 {
1410         /* No need to lock because we've taken one refcount of layout.  */
1411         return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1412                                     io);
1413 }
1414
1415 /**
1416  * We calculate on which OST the mapping will end. If the length of mapping
1417  * is greater than (stripe_size * stripe_count) then the last_stripe will
1418  * will be one just before start_stripe. Else we check if the mapping
1419  * intersects each OST and find last_stripe.
1420  * This function returns the last_stripe and also sets the stripe_count
1421  * over which the mapping is spread
1422  *
1423  * \param lsm [in]              striping information for the file
1424  * \param index [in]            stripe component index
1425  * \param ext [in]              logical extent of mapping
1426  * \param start_stripe [in]     starting stripe of the mapping
1427  * \param stripe_count [out]    the number of stripes across which to map is
1428  *                              returned
1429  *
1430  * \retval last_stripe          return the last stripe of the mapping
1431  */
1432 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, int index,
1433                                    struct lu_extent *ext,
1434                                    int start_stripe, int *stripe_count)
1435 {
1436         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1437         int last_stripe;
1438         u64 obd_start;
1439         u64 obd_end;
1440         int i, j;
1441
1442         if (ext->e_end - ext->e_start >
1443             lsme->lsme_stripe_size * lsme->lsme_stripe_count) {
1444                 last_stripe = (start_stripe < 1 ? lsme->lsme_stripe_count - 1 :
1445                                                   start_stripe - 1);
1446                 *stripe_count = lsme->lsme_stripe_count;
1447         } else {
1448                 for (j = 0, i = start_stripe; j < lsme->lsme_stripe_count;
1449                      i = (i + 1) % lsme->lsme_stripe_count, j++) {
1450                         if ((lov_stripe_intersects(lsm, index,  i, ext,
1451                                                    &obd_start, &obd_end)) == 0)
1452                                 break;
1453                 }
1454                 *stripe_count = j;
1455                 last_stripe = (start_stripe + j - 1) % lsme->lsme_stripe_count;
1456         }
1457
1458         return last_stripe;
1459 }
1460
1461 /**
1462  * Set fe_device and copy extents from local buffer into main return buffer.
1463  *
1464  * \param fiemap [out]          fiemap to hold all extents
1465  * \param lcl_fm_ext [in]       array of fiemap extents get from OSC layer
1466  * \param ost_index [in]        OST index to be written into the fm_device
1467  *                              field for each extent
1468  * \param ext_count [in]        number of extents to be copied
1469  * \param current_extent [in]   where to start copying in the extent array
1470  */
1471 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1472                                          struct fiemap_extent *lcl_fm_ext,
1473                                          int ost_index, unsigned int ext_count,
1474                                          int current_extent)
1475 {
1476         char            *to;
1477         unsigned int    ext;
1478
1479         for (ext = 0; ext < ext_count; ext++) {
1480                 lcl_fm_ext[ext].fe_device = ost_index;
1481                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1482         }
1483
1484         /* Copy fm_extent's from fm_local to return buffer */
1485         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1486         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1487 }
1488
1489 #define FIEMAP_BUFFER_SIZE 4096
1490
1491 /**
1492  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1493  * call. The local end offset and the device are sent in the first
1494  * fm_extent. This function calculates the stripe number from the index.
1495  * This function returns a stripe_no on which mapping is to be restarted.
1496  *
1497  * This function returns fm_end_offset which is the in-OST offset at which
1498  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1499  * will re-calculate proper offset in next stripe.
1500  * Note that the first extent is passed to lov_get_info via the value field.
1501  *
1502  * \param fiemap [in]           fiemap request header
1503  * \param lsm [in]              striping information for the file
1504  * \param index [in]            stripe component index
1505  * \param ext [in]              logical extent of mapping
1506  * \param start_stripe [out]    starting stripe will be returned in this
1507  */
1508 static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1509                                      struct lov_stripe_md *lsm,
1510                                      int index, struct lu_extent *ext,
1511                                      int *start_stripe)
1512 {
1513         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1514         u64 local_end = fiemap->fm_extents[0].fe_logical;
1515         u64 lun_start;
1516         u64 lun_end;
1517         u64 fm_end_offset;
1518         int stripe_no = -1;
1519         int i;
1520
1521         if (fiemap->fm_extent_count == 0 ||
1522             fiemap->fm_extents[0].fe_logical == 0)
1523                 return 0;
1524
1525         /* Find out stripe_no from ost_index saved in the fe_device */
1526         for (i = 0; i < lsme->lsme_stripe_count; i++) {
1527                 struct lov_oinfo *oinfo = lsme->lsme_oinfo[i];
1528
1529                 if (lov_oinfo_is_dummy(oinfo))
1530                         continue;
1531
1532                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1533                         stripe_no = i;
1534                         break;
1535                 }
1536         }
1537
1538         if (stripe_no == -1)
1539                 return -EINVAL;
1540
1541         /* If we have finished mapping on previous device, shift logical
1542          * offset to start of next device */
1543         if (lov_stripe_intersects(lsm, index, stripe_no, ext,
1544                                    &lun_start, &lun_end) != 0 &&
1545             local_end < lun_end) {
1546                 fm_end_offset = local_end;
1547                 *start_stripe = stripe_no;
1548         } else {
1549                 /* This is a special value to indicate that caller should
1550                  * calculate offset in next stripe. */
1551                 fm_end_offset = 0;
1552                 *start_stripe = (stripe_no + 1) % lsme->lsme_stripe_count;
1553         }
1554
1555         return fm_end_offset;
1556 }
1557
1558 struct fiemap_state {
1559         struct fiemap           *fs_fm;
1560         struct lu_extent        fs_ext;
1561         u64                     fs_length;
1562         u64                     fs_end_offset;
1563         int                     fs_cur_extent;
1564         int                     fs_cnt_need;
1565         int                     fs_start_stripe;
1566         int                     fs_last_stripe;
1567         bool                    fs_device_done;
1568         bool                    fs_finish_stripe;
1569         bool                    fs_enough;
1570 };
1571
1572 static struct cl_object *lov_find_subobj(const struct lu_env *env,
1573                                          struct lov_object *lov,
1574                                          struct lov_stripe_md *lsm,
1575                                          int index)
1576 {
1577         struct lov_device       *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
1578         struct lov_thread_info  *lti = lov_env_info(env);
1579         struct lu_fid           *ofid = &lti->lti_fid;
1580         struct lov_oinfo        *oinfo;
1581         struct cl_device        *subdev;
1582         int                     entry = lov_comp_entry(index);
1583         int                     stripe = lov_comp_stripe(index);
1584         int                     ost_idx;
1585         int                     rc;
1586         struct cl_object        *result;
1587
1588         if (lov->lo_type != LLT_COMP)
1589                 GOTO(out, result = NULL);
1590
1591         if (entry >= lsm->lsm_entry_count ||
1592             stripe >= lsm->lsm_entries[entry]->lsme_stripe_count)
1593                 GOTO(out, result = NULL);
1594
1595         oinfo = lsm->lsm_entries[entry]->lsme_oinfo[stripe];
1596         ost_idx = oinfo->loi_ost_idx;
1597         rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
1598         if (rc != 0)
1599                 GOTO(out, result = NULL);
1600
1601         subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
1602         result = lov_sub_find(env, subdev, ofid, NULL);
1603 out:
1604         if (result == NULL)
1605                 result = ERR_PTR(-EINVAL);
1606         return result;
1607 }
1608
1609 int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj,
1610                       struct lov_stripe_md *lsm, struct fiemap *fiemap,
1611                       size_t *buflen, struct ll_fiemap_info_key *fmkey,
1612                       int index, int stripeno, struct fiemap_state *fs)
1613 {
1614         struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1615         struct cl_object *subobj;
1616         struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1617         struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0];
1618         u64 req_fm_len; /* Stores length of required mapping */
1619         u64 len_mapped_single_call;
1620         u64 lun_start;
1621         u64 lun_end;
1622         u64 obd_object_end;
1623         unsigned int ext_count;
1624         /* EOF for object */
1625         bool ost_eof = false;
1626         /* done with required mapping for this OST? */
1627         bool ost_done = false;
1628         int ost_index;
1629         int rc = 0;
1630
1631         fs->fs_device_done = false;
1632         /* Find out range of mapping on this stripe */
1633         if ((lov_stripe_intersects(lsm, index, stripeno, &fs->fs_ext,
1634                                    &lun_start, &obd_object_end)) == 0)
1635                 return 0;
1636
1637         if (lov_oinfo_is_dummy(lsme->lsme_oinfo[stripeno]))
1638                 return -EIO;
1639
1640         /* If this is a continuation FIEMAP call and we are on
1641          * starting stripe then lun_start needs to be set to
1642          * end_offset */
1643         if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe)
1644                 lun_start = fs->fs_end_offset;
1645         lun_end = lov_size_to_stripe(lsm, index, fs->fs_ext.e_end, stripeno);
1646         if (lun_start == lun_end)
1647                 return 0;
1648
1649         req_fm_len = obd_object_end - lun_start;
1650         fs->fs_fm->fm_length = 0;
1651         len_mapped_single_call = 0;
1652
1653         /* find lobsub object */
1654         subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1655                                  lov_comp_index(index, stripeno));
1656         if (IS_ERR(subobj))
1657                 return PTR_ERR(subobj);
1658         /* If the output buffer is very large and the objects have many
1659          * extents we may need to loop on a single OST repeatedly */
1660         do {
1661                 if (fiemap->fm_extent_count > 0) {
1662                         /* Don't get too many extents. */
1663                         if (fs->fs_cur_extent + fs->fs_cnt_need >
1664                             fiemap->fm_extent_count)
1665                                 fs->fs_cnt_need = fiemap->fm_extent_count -
1666                                                   fs->fs_cur_extent;
1667                 }
1668
1669                 lun_start += len_mapped_single_call;
1670                 fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call;
1671                 req_fm_len = fs->fs_fm->fm_length;
1672                 /**
1673                  * If we've collected enough extent map, we'd request 1 more,
1674                  * to see whether we coincidentally finished all available
1675                  * extent map, so that FIEMAP_EXTENT_LAST would be set.
1676                  */
1677                 fs->fs_fm->fm_extent_count = fs->fs_enough ?
1678                                              1 : fs->fs_cnt_need;
1679                 fs->fs_fm->fm_mapped_extents = 0;
1680                 fs->fs_fm->fm_flags = fiemap->fm_flags;
1681
1682                 ost_index = lsme->lsme_oinfo[stripeno]->loi_ost_idx;
1683
1684                 if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count)
1685                         GOTO(obj_put, rc = -EINVAL);
1686                 /* If OST is inactive, return extent with UNKNOWN flag. */
1687                 if (!lov->lov_tgts[ost_index]->ltd_active) {
1688                         fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST;
1689                         fs->fs_fm->fm_mapped_extents = 1;
1690
1691                         fm_ext[0].fe_logical = lun_start;
1692                         fm_ext[0].fe_length = obd_object_end - lun_start;
1693                         fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1694
1695                         goto inactive_tgt;
1696                 }
1697
1698                 fs->fs_fm->fm_start = lun_start;
1699                 fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1700                 memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm));
1701                 *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count);
1702
1703                 rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen);
1704                 if (rc != 0)
1705                         GOTO(obj_put, rc);
1706 inactive_tgt:
1707                 ext_count = fs->fs_fm->fm_mapped_extents;
1708                 if (ext_count == 0) {
1709                         ost_done = true;
1710                         fs->fs_device_done = true;
1711                         /* If last stripe has hold at the end,
1712                          * we need to return */
1713                         if (stripeno == fs->fs_last_stripe) {
1714                                 fiemap->fm_mapped_extents = 0;
1715                                 fs->fs_finish_stripe = true;
1716                                 GOTO(obj_put, rc);
1717                         }
1718                         break;
1719                 } else if (fs->fs_enough) {
1720                         /*
1721                          * We've collected enough extents and there are
1722                          * more extents after it.
1723                          */
1724                         GOTO(obj_put, rc);
1725                 }
1726
1727                 /* If we just need num of extents, got to next device */
1728                 if (fiemap->fm_extent_count == 0) {
1729                         fs->fs_cur_extent += ext_count;
1730                         break;
1731                 }
1732
1733                 /* prepare to copy retrived map extents */
1734                 len_mapped_single_call = fm_ext[ext_count - 1].fe_logical +
1735                                          fm_ext[ext_count - 1].fe_length -
1736                                          lun_start;
1737
1738                 /* Have we finished mapping on this device? */
1739                 if (req_fm_len <= len_mapped_single_call) {
1740                         ost_done = true;
1741                         fs->fs_device_done = true;
1742                 }
1743
1744                 /* Clear the EXTENT_LAST flag which can be present on
1745                  * the last extent */
1746                 if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST)
1747                         fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST;
1748                 if (lov_stripe_size(lsm, index,
1749                                     fm_ext[ext_count - 1].fe_logical +
1750                                     fm_ext[ext_count - 1].fe_length,
1751                                     stripeno) >= fmkey->lfik_oa.o_size) {
1752                         ost_eof = true;
1753                         fs->fs_device_done = true;
1754                 }
1755
1756                 fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index,
1757                                              ext_count, fs->fs_cur_extent);
1758                 fs->fs_cur_extent += ext_count;
1759
1760                 /* Ran out of available extents? */
1761                 if (fs->fs_cur_extent >= fiemap->fm_extent_count)
1762                         fs->fs_enough = true;
1763         } while (!ost_done && !ost_eof);
1764
1765         if (stripeno == fs->fs_last_stripe)
1766                 fs->fs_finish_stripe = true;
1767 obj_put:
1768         cl_object_put(env, subobj);
1769
1770         return rc;
1771 }
1772
1773 /**
1774  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1775  * This also handles the restarting of FIEMAP calls in case mapping overflows
1776  * the available number of extents in single call.
1777  *
1778  * \param env [in]              lustre environment
1779  * \param obj [in]              file object
1780  * \param fmkey [in]            fiemap request header and other info
1781  * \param fiemap [out]          fiemap buffer holding retrived map extents
1782  * \param buflen [in/out]       max buffer length of @fiemap, when iterate
1783  *                              each OST, it is used to limit max map needed
1784  * \retval 0    success
1785  * \retval < 0  error
1786  */
1787 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1788                              struct ll_fiemap_info_key *fmkey,
1789                              struct fiemap *fiemap, size_t *buflen)
1790 {
1791         struct lov_stripe_md_entry *lsme;
1792         struct lov_stripe_md *lsm;
1793         struct fiemap *fm_local = NULL;
1794         loff_t whole_start;
1795         loff_t whole_end;
1796         int entry;
1797         int start_entry;
1798         int end_entry;
1799         int cur_stripe = 0;
1800         int stripe_count;
1801         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1802         int rc = 0;
1803         struct fiemap_state fs = { 0 };
1804         ENTRY;
1805
1806         lsm = lov_lsm_addref(cl2lov(obj));
1807         if (lsm == NULL) {
1808                 /* no extent: there is no object for mapping */
1809                 fiemap->fm_mapped_extents = 0;
1810                 return 0;
1811         }
1812
1813         if (!(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
1814                 /**
1815                  * If the entry count > 1 or stripe_count > 1 and the
1816                  * application does not understand DEVICE_ORDER flag,
1817                  * it cannot interpret the extents correctly.
1818                  */
1819                 if (lsm->lsm_entry_count > 1 ||
1820                     (lsm->lsm_entry_count == 1 &&
1821                      lsm->lsm_entries[0]->lsme_stripe_count > 1))
1822                         GOTO(out_lsm, rc = -ENOTSUPP);
1823         }
1824
1825         /* No support for DOM layout yet. */
1826         if (lsme_is_dom(lsm->lsm_entries[0]))
1827                 GOTO(out_lsm, rc = -ENOTSUPP);
1828
1829         if (lsm->lsm_is_released) {
1830                 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1831                         /**
1832                          * released file, return a minimal FIEMAP if
1833                          * request fits in file-size.
1834                          */
1835                         fiemap->fm_mapped_extents = 1;
1836                         fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1837                         if (fiemap->fm_start + fiemap->fm_length <
1838                             fmkey->lfik_oa.o_size)
1839                                 fiemap->fm_extents[0].fe_length =
1840                                         fiemap->fm_length;
1841                         else
1842                                 fiemap->fm_extents[0].fe_length =
1843                                         fmkey->lfik_oa.o_size -
1844                                         fiemap->fm_start;
1845                         fiemap->fm_extents[0].fe_flags |=
1846                                 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1847                 }
1848                 GOTO(out_lsm, rc = 0);
1849         }
1850
1851         /* buffer_size is small to hold fm_extent_count of extents. */
1852         if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1853                 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1854
1855         OBD_ALLOC_LARGE(fm_local, buffer_size);
1856         if (fm_local == NULL)
1857                 GOTO(out_lsm, rc = -ENOMEM);
1858
1859         /**
1860          * Requested extent count exceeds the fiemap buffer size, shrink our
1861          * ambition.
1862          */
1863         if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1864                 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1865         if (fiemap->fm_extent_count == 0)
1866                 fs.fs_cnt_need = 0;
1867
1868         fs.fs_enough = false;
1869         fs.fs_cur_extent = 0;
1870         fs.fs_fm = fm_local;
1871         fs.fs_cnt_need = fiemap_size_to_count(buffer_size);
1872
1873         whole_start = fiemap->fm_start;
1874         /* whole_start is beyond the end of the file */
1875         if (whole_start > fmkey->lfik_oa.o_size)
1876                 GOTO(out_fm_local, rc = -EINVAL);
1877         whole_end = (fiemap->fm_length == OBD_OBJECT_EOF) ?
1878                                         fmkey->lfik_oa.o_size :
1879                                         whole_start + fiemap->fm_length - 1;
1880         /**
1881          * If fiemap->fm_length != OBD_OBJECT_EOF but whole_end exceeds file
1882          * size
1883          */
1884         if (whole_end > fmkey->lfik_oa.o_size)
1885                 whole_end = fmkey->lfik_oa.o_size;
1886
1887         start_entry = lov_lsm_entry(lsm, whole_start);
1888         end_entry = lov_lsm_entry(lsm, whole_end);
1889         if (end_entry == -1)
1890                 end_entry = lsm->lsm_entry_count - 1;
1891
1892         if (start_entry == -1 || end_entry == -1)
1893                 GOTO(out_fm_local, rc = -EINVAL);
1894
1895         /* TODO: rewrite it with lov_foreach_io_layout() */
1896         for (entry = start_entry; entry <= end_entry; entry++) {
1897                 lsme = lsm->lsm_entries[entry];
1898
1899                 if (!lsme_inited(lsme))
1900                         break;
1901
1902                 if (entry == start_entry)
1903                         fs.fs_ext.e_start = whole_start;
1904                 else
1905                         fs.fs_ext.e_start = lsme->lsme_extent.e_start;
1906                 if (entry == end_entry)
1907                         fs.fs_ext.e_end = whole_end;
1908                 else
1909                         fs.fs_ext.e_end = lsme->lsme_extent.e_end - 1;
1910                 fs.fs_length = fs.fs_ext.e_end - fs.fs_ext.e_start + 1;
1911
1912                 /* Calculate start stripe, last stripe and length of mapping */
1913                 fs.fs_start_stripe = lov_stripe_number(lsm, entry,
1914                                                        fs.fs_ext.e_start);
1915                 fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, entry,
1916                                         &fs.fs_ext, fs.fs_start_stripe,
1917                                         &stripe_count);
1918                 fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, entry,
1919                                         &fs.fs_ext, &fs.fs_start_stripe);
1920                 /* Check each stripe */
1921                 for (cur_stripe = fs.fs_start_stripe; stripe_count > 0;
1922                      --stripe_count,
1923                      cur_stripe = (cur_stripe + 1) % lsme->lsme_stripe_count) {
1924                         rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen,
1925                                                fmkey, entry, cur_stripe, &fs);
1926                         if (rc < 0)
1927                                 GOTO(out_fm_local, rc);
1928                         if (fs.fs_enough)
1929                                 GOTO(finish, rc);
1930                         if (fs.fs_finish_stripe)
1931                                 break;
1932                 } /* for each stripe */
1933         } /* for covering layout component */
1934         /*
1935          * We've traversed all components, set @entry to the last component
1936          * entry, it's for the last stripe check.
1937          */
1938         entry--;
1939 finish:
1940         /* Indicate that we are returning device offsets unless file just has
1941          * single stripe */
1942         if (lsm->lsm_entry_count > 1 ||
1943             (lsm->lsm_entry_count == 1 &&
1944              lsm->lsm_entries[0]->lsme_stripe_count > 1))
1945                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1946
1947         if (fiemap->fm_extent_count == 0)
1948                 goto skip_last_device_calc;
1949
1950         /* Check if we have reached the last stripe and whether mapping for that
1951          * stripe is done. */
1952         if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done)
1953                 fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |=
1954                                                              FIEMAP_EXTENT_LAST;
1955 skip_last_device_calc:
1956         fiemap->fm_mapped_extents = fs.fs_cur_extent;
1957 out_fm_local:
1958         OBD_FREE_LARGE(fm_local, buffer_size);
1959
1960 out_lsm:
1961         lov_lsm_put(lsm);
1962         return rc;
1963 }
1964
1965 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
1966                                 struct lov_user_md __user *lum, size_t size)
1967 {
1968         struct lov_object       *lov = cl2lov(obj);
1969         struct lov_stripe_md    *lsm;
1970         int                     rc = 0;
1971         ENTRY;
1972
1973         lsm = lov_lsm_addref(lov);
1974         if (lsm == NULL)
1975                 RETURN(-ENODATA);
1976
1977         rc = lov_getstripe(env, cl2lov(obj), lsm, lum, size);
1978         lov_lsm_put(lsm);
1979         RETURN(rc);
1980 }
1981
1982 static int lov_object_layout_get(const struct lu_env *env,
1983                                  struct cl_object *obj,
1984                                  struct cl_layout *cl)
1985 {
1986         struct lov_object *lov = cl2lov(obj);
1987         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
1988         struct lu_buf *buf = &cl->cl_buf;
1989         ssize_t rc;
1990         ENTRY;
1991
1992         if (lsm == NULL) {
1993                 cl->cl_size = 0;
1994                 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
1995
1996                 RETURN(0);
1997         }
1998
1999         cl->cl_size = lov_comp_md_size(lsm);
2000         cl->cl_layout_gen = lsm->lsm_layout_gen;
2001         cl->cl_dom_comp_size = 0;
2002         if (lsm_is_composite(lsm->lsm_magic)) {
2003                 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[0];
2004
2005                 cl->cl_is_composite = true;
2006
2007                 if (lsme_is_dom(lsme))
2008                         cl->cl_dom_comp_size = lsme->lsme_extent.e_end;
2009         } else {
2010                 cl->cl_is_composite = false;
2011         }
2012
2013         rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
2014         lov_lsm_put(lsm);
2015
2016         RETURN(rc < 0 ? rc : 0);
2017 }
2018
2019 static loff_t lov_object_maxbytes(struct cl_object *obj)
2020 {
2021         struct lov_object *lov = cl2lov(obj);
2022         struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2023         loff_t maxbytes;
2024
2025         if (lsm == NULL)
2026                 return LLONG_MAX;
2027
2028         maxbytes = lsm->lsm_maxbytes;
2029
2030         lov_lsm_put(lsm);
2031
2032         return maxbytes;
2033 }
2034
2035 static const struct cl_object_operations lov_ops = {
2036         .coo_page_init    = lov_page_init,
2037         .coo_lock_init    = lov_lock_init,
2038         .coo_io_init      = lov_io_init,
2039         .coo_attr_get     = lov_attr_get,
2040         .coo_attr_update  = lov_attr_update,
2041         .coo_conf_set     = lov_conf_set,
2042         .coo_getstripe    = lov_object_getstripe,
2043         .coo_layout_get   = lov_object_layout_get,
2044         .coo_maxbytes     = lov_object_maxbytes,
2045         .coo_fiemap       = lov_object_fiemap,
2046 };
2047
2048 static const struct lu_object_operations lov_lu_obj_ops = {
2049         .loo_object_init      = lov_object_init,
2050         .loo_object_delete    = lov_object_delete,
2051         .loo_object_release   = NULL,
2052         .loo_object_free      = lov_object_free,
2053         .loo_object_print     = lov_object_print,
2054         .loo_object_invariant = NULL
2055 };
2056
2057 struct lu_object *lov_object_alloc(const struct lu_env *env,
2058                                    const struct lu_object_header *unused,
2059                                    struct lu_device *dev)
2060 {
2061         struct lov_object *lov;
2062         struct lu_object  *obj;
2063
2064         ENTRY;
2065         OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
2066         if (lov != NULL) {
2067                 obj = lov2lu(lov);
2068                 lu_object_init(obj, NULL, dev);
2069                 lov->lo_cl.co_ops = &lov_ops;
2070                 lov->lo_type = -1; /* invalid, to catch uninitialized type */
2071                 /*
2072                  * object io operation vector (cl_object::co_iop) is installed
2073                  * later in lov_object_init(), as different vectors are used
2074                  * for object with different layouts.
2075                  */
2076                 obj->lo_ops = &lov_lu_obj_ops;
2077         } else
2078                 obj = NULL;
2079         RETURN(obj);
2080 }
2081
2082 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
2083 {
2084         struct lov_stripe_md *lsm = NULL;
2085
2086         lov_conf_freeze(lov);
2087         if (lov->lo_lsm != NULL) {
2088                 lsm = lsm_addref(lov->lo_lsm);
2089                 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
2090                         lsm, atomic_read(&lsm->lsm_refc),
2091                         lov->lo_layout_invalid, current);
2092         }
2093         lov_conf_thaw(lov);
2094         return lsm;
2095 }
2096
2097 int lov_read_and_clear_async_rc(struct cl_object *clob)
2098 {
2099         struct lu_object *luobj;
2100         int rc = 0;
2101         ENTRY;
2102
2103         luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
2104                                  &lov_device_type);
2105         if (luobj != NULL) {
2106                 struct lov_object *lov = lu2lov(luobj);
2107
2108                 lov_conf_freeze(lov);
2109                 switch (lov->lo_type) {
2110                 case LLT_COMP: {
2111                         struct lov_stripe_md *lsm;
2112                         int i;
2113
2114                         lsm = lov->lo_lsm;
2115                         LASSERT(lsm != NULL);
2116                         for (i = 0; i < lsm->lsm_entry_count; i++) {
2117                                 struct lov_stripe_md_entry *lse =
2118                                                 lsm->lsm_entries[i];
2119                                 int j;
2120
2121                                 if (!lsme_inited(lse))
2122                                         break;
2123
2124                                 for (j = 0; j < lse->lsme_stripe_count; j++) {
2125                                         struct lov_oinfo *loi =
2126                                                         lse->lsme_oinfo[j];
2127
2128                                         if (lov_oinfo_is_dummy(loi))
2129                                                 continue;
2130
2131                                         if (loi->loi_ar.ar_rc && !rc)
2132                                                 rc = loi->loi_ar.ar_rc;
2133                                         loi->loi_ar.ar_rc = 0;
2134                                 }
2135                         }
2136                 }
2137                 case LLT_RELEASED:
2138                 case LLT_EMPTY:
2139                         break;
2140                 default:
2141                         LBUG();
2142                 }
2143                 lov_conf_thaw(lov);
2144         }
2145         RETURN(rc);
2146 }
2147 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
2148
2149 /** @} lov */