lustre/lov/lov_ea.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) 2007, 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  * lustre/lov/lov_ea.c
  33  *
  34  * Author: Wang Di <wangdi@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LOV
  38
  39 #include <linux/math64.h>
  40 #include <linux/sort.h>
  41 #include <libcfs/libcfs.h>
  42
  43 #include <obd_class.h>
  44 #include "lov_internal.h"
  45
  46 static inline void
  47 lu_extent_le_to_cpu(struct lu_extent *dst, const struct lu_extent *src)
  48 {
  49         dst->e_start = le64_to_cpu(src->e_start);
  50         dst->e_end = le64_to_cpu(src->e_end);
  51 }
  52
  53 /*
  54  * Find minimum stripe maxbytes value.  For inactive or
  55  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES.
  56  */
  57 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
  58 {
  59         struct obd_import *imp;
  60         loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
  61
  62         if (!tgt->ltd_active)
  63                 return maxbytes;
  64
  65         imp = tgt->ltd_obd->u.cli.cl_import;
  66         if (!imp)
  67                 return maxbytes;
  68
  69         spin_lock(&imp->imp_lock);
  70         if ((imp->imp_state == LUSTRE_IMP_FULL ||
  71             imp->imp_state == LUSTRE_IMP_IDLE) &&
  72             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
  73             imp->imp_connect_data.ocd_maxbytes > 0)
  74                 maxbytes = imp->imp_connect_data.ocd_maxbytes;
  75
  76         spin_unlock(&imp->imp_lock);
  77
  78         return maxbytes;
  79 }
  80
  81 static int lsm_lmm_verify_v1v3(struct lov_mds_md *lmm, size_t lmm_size,
  82                                u16 stripe_count)
  83 {
  84         int rc = 0;
  85
  86         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  87                 rc = -EINVAL;
  88                 CERROR("lov: bad stripe count %d: rc = %d\n",
  89                        stripe_count, rc);
  90                 lov_dump_lmm_common(D_WARNING, lmm);
  91                 goto out;
  92         }
  93
  94         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  95                 rc = -EINVAL;
  96                 CERROR("lov: zero object id: rc = %d\n", rc);
  97                 lov_dump_lmm_common(D_WARNING, lmm);
  98                 goto out;
  99         }
 100
 101         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_MDT &&
 102             lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0 &&
 103             lov_pattern(le32_to_cpu(lmm->lmm_pattern)) !=
 104                         (LOV_PATTERN_RAID0 | LOV_PATTERN_OVERSTRIPING)) {
 105                 rc = -EINVAL;
 106                 CERROR("lov: unrecognized striping pattern: rc = %d\n", rc);
 107                 lov_dump_lmm_common(D_WARNING, lmm);
 108                 goto out;
 109         }
 110
 111         if (lmm->lmm_stripe_size == 0 ||
 112             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
 113                 rc = -EINVAL;
 114                 CERROR("lov: bad stripe size %u: rc = %d\n",
 115                        le32_to_cpu(lmm->lmm_stripe_size), rc);
 116                 lov_dump_lmm_common(D_WARNING, lmm);
 117                 goto out;
 118         }
 119
 120 out:
 121         return rc;
 122 }
 123
 124 static void lsme_free(struct lov_stripe_md_entry *lsme)
 125 {
 126         unsigned int stripe_count = lsme->lsme_stripe_count;
 127         unsigned int i;
 128         size_t lsme_size;
 129
 130         if (!lsme_inited(lsme) ||
 131             lsme->lsme_pattern & LOV_PATTERN_F_RELEASED)
 132                 stripe_count = 0;
 133         for (i = 0; i < stripe_count; i++)
 134                 OBD_SLAB_FREE_PTR(lsme->lsme_oinfo[i], lov_oinfo_slab);
 135
 136         lsme_size = offsetof(typeof(*lsme), lsme_oinfo[stripe_count]);
 137         OBD_FREE_LARGE(lsme, lsme_size);
 138 }
 139
 140 void lsm_free(struct lov_stripe_md *lsm)
 141 {
 142         unsigned int entry_count = lsm->lsm_entry_count;
 143         unsigned int i;
 144         size_t lsm_size;
 145
 146         if (lsm->lsm_magic == LOV_MAGIC_FOREIGN) {
 147                 OBD_FREE_LARGE(lsm_foreign(lsm), lsm->lsm_foreign_size);
 148         } else {
 149                 for (i = 0; i < entry_count; i++)
 150                         lsme_free(lsm->lsm_entries[i]);
 151         }
 152
 153         lsm_size = lsm->lsm_magic == LOV_MAGIC_FOREIGN ?
 154                    offsetof(typeof(*lsm), lsm_entries[1]) :
 155                    offsetof(typeof(*lsm), lsm_entries[entry_count]);
 156         OBD_FREE(lsm, lsm_size);
 157 }
 158
 159 /**
 160  * Unpack a struct lov_mds_md into a struct lov_stripe_md_entry.
 161  *
 162  * The caller should set id and extent.
 163  */
 164 static struct lov_stripe_md_entry *
 165 lsme_unpack(struct lov_obd *lov, struct lov_mds_md *lmm, size_t buf_size,
 166             const char *pool_name, bool inited, struct lov_ost_data_v1 *objects,
 167             loff_t *maxbytes)
 168 {
 169         struct lov_stripe_md_entry *lsme;
 170         size_t lsme_size;
 171         loff_t min_stripe_maxbytes = 0;
 172         loff_t lov_bytes;
 173         u32 magic;
 174         u32 pattern;
 175         unsigned int stripe_count;
 176         unsigned int i;
 177         int rc;
 178
 179         magic = le32_to_cpu(lmm->lmm_magic);
 180         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 181                 RETURN(ERR_PTR(-EINVAL));
 182
 183         pattern = le32_to_cpu(lmm->lmm_pattern);
 184         if (pattern & LOV_PATTERN_F_RELEASED || !inited)
 185                 stripe_count = 0;
 186         else
 187                 stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 188
 189         if (buf_size < (magic == LOV_MAGIC_V1 ? sizeof(struct lov_mds_md_v1) :
 190                                                 sizeof(struct lov_mds_md_v3))) {
 191                 CERROR("LOV EA %s too small: %zu, need %u\n",
 192                        magic == LOV_MAGIC_V1 ? "V1" : "V3", buf_size,
 193                        lov_mds_md_size(stripe_count, magic == LOV_MAGIC_V1 ?
 194                                        LOV_MAGIC_V1 : LOV_MAGIC_V3));
 195                 lov_dump_lmm_common(D_WARNING, lmm);
 196                 return ERR_PTR(-EINVAL);
 197         }
 198
 199         rc = lsm_lmm_verify_v1v3(lmm, buf_size, stripe_count);
 200         if (rc < 0)
 201                 return ERR_PTR(rc);
 202
 203         lsme_size = offsetof(typeof(*lsme), lsme_oinfo[stripe_count]);
 204         OBD_ALLOC_LARGE(lsme, lsme_size);
 205         if (!lsme)
 206                 RETURN(ERR_PTR(-ENOMEM));
 207
 208         lsme->lsme_magic = magic;
 209         lsme->lsme_pattern = pattern;
 210         lsme->lsme_flags = 0;
 211         lsme->lsme_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 212         /* preserve the possible -1 stripe count for uninstantiated component */
 213         lsme->lsme_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 214         lsme->lsme_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 215
 216         if (pool_name) {
 217                 size_t pool_name_len;
 218
 219                 pool_name_len = strlcpy(lsme->lsme_pool_name, pool_name,
 220                                         sizeof(lsme->lsme_pool_name));
 221                 if (pool_name_len >= sizeof(lsme->lsme_pool_name))
 222                         GOTO(out_lsme, rc = -E2BIG);
 223         }
 224
 225         /* with Data-on-MDT set maxbytes to stripe size */
 226         if (lsme_is_dom(lsme)) {
 227                 lov_bytes = lsme->lsme_stripe_size;
 228                 goto out_dom;
 229         }
 230
 231         for (i = 0; i < stripe_count; i++) {
 232                 struct lov_oinfo *loi;
 233                 struct lov_tgt_desc *ltd;
 234
 235                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 236                 if (!loi)
 237                         GOTO(out_lsme, rc = -ENOMEM);
 238
 239                 lsme->lsme_oinfo[i] = loi;
 240
 241                 ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 242                 loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 243                 loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 244                 if (lov_oinfo_is_dummy(loi))
 245                         continue;
 246
 247                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
 248                     !lov2obd(lov)->obd_process_conf) {
 249                         CERROR("%s: OST index %d more than OST count %d\n",
 250                                (char*)lov->desc.ld_uuid.uuid,
 251                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 252                         lov_dump_lmm_v1(D_WARNING, lmm);
 253                         GOTO(out_lsme, rc = -EINVAL);
 254                 }
 255
 256                 ltd = lov->lov_tgts[loi->loi_ost_idx];
 257                 if (!ltd) {
 258                         CERROR("%s: OST index %d missing\n",
 259                                (char*)lov->desc.ld_uuid.uuid, loi->loi_ost_idx);
 260                         lov_dump_lmm_v1(D_WARNING, lmm);
 261                         continue;
 262                 }
 263
 264                 lov_bytes = lov_tgt_maxbytes(ltd);
 265                 if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
 266                         min_stripe_maxbytes = lov_bytes;
 267         }
 268
 269         if (min_stripe_maxbytes == 0)
 270                 min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 271
 272         if (stripe_count == 0)
 273                 lov_bytes = min_stripe_maxbytes;
 274         else if (min_stripe_maxbytes <= LLONG_MAX / stripe_count)
 275                 lov_bytes = min_stripe_maxbytes * stripe_count;
 276         else
 277                 lov_bytes = MAX_LFS_FILESIZE;
 278
 279 out_dom:
 280         if (maxbytes)
 281                 *maxbytes = min_t(loff_t, lov_bytes, MAX_LFS_FILESIZE);
 282
 283         return lsme;
 284
 285 out_lsme:
 286         for (i = 0; i < stripe_count; i++) {
 287                 struct lov_oinfo *loi = lsme->lsme_oinfo[i];
 288
 289                 if (loi)
 290                         OBD_SLAB_FREE_PTR(lsme->lsme_oinfo[i], lov_oinfo_slab);
 291         }
 292         OBD_FREE_LARGE(lsme, lsme_size);
 293
 294         return ERR_PTR(rc);
 295 }
 296
 297 static struct
 298 lov_stripe_md *lsm_unpackmd_v1v3(struct lov_obd *lov, struct lov_mds_md *lmm,
 299                                  size_t buf_size, const char *pool_name,
 300                                  struct lov_ost_data_v1 *objects)
 301 {
 302         struct lov_stripe_md *lsm;
 303         struct lov_stripe_md_entry *lsme;
 304         size_t lsm_size;
 305         loff_t maxbytes;
 306         u32 pattern;
 307         int rc;
 308
 309         pattern = le32_to_cpu(lmm->lmm_pattern);
 310
 311         lsme = lsme_unpack(lov, lmm, buf_size, pool_name, true, objects,
 312                            &maxbytes);
 313         if (IS_ERR(lsme))
 314                 RETURN(ERR_CAST(lsme));
 315
 316         lsme->lsme_flags = LCME_FL_INIT;
 317         lsme->lsme_extent.e_start = 0;
 318         lsme->lsme_extent.e_end = LUSTRE_EOF;
 319
 320         lsm_size = offsetof(typeof(*lsm), lsm_entries[1]);
 321         OBD_ALLOC(lsm, lsm_size);
 322         if (!lsm)
 323                 GOTO(out_lsme, rc = -ENOMEM);
 324
 325         atomic_set(&lsm->lsm_refc, 1);
 326         spin_lock_init(&lsm->lsm_lock);
 327         lsm->lsm_maxbytes = maxbytes;
 328         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 329         lsm->lsm_magic = le32_to_cpu(lmm->lmm_magic);
 330         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 331         lsm->lsm_entry_count = 1;
 332         lsm->lsm_is_released = pattern & LOV_PATTERN_F_RELEASED;
 333         lsm->lsm_entries[0] = lsme;
 334
 335         return lsm;
 336
 337 out_lsme:
 338         lsme_free(lsme);
 339
 340         return ERR_PTR(rc);
 341 }
 342
 343 static inline struct lov_stripe_md *
 344 lsm_unpackmd_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 345 {
 346         struct lov_mds_md_v1 *lmm = buf;
 347
 348         return lsm_unpackmd_v1v3(lov, buf, buf_size, NULL, lmm->lmm_objects);
 349 }
 350
 351 const struct lsm_operations lsm_v1_ops = {
 352         .lsm_unpackmd           = lsm_unpackmd_v1,
 353 };
 354
 355 static inline
 356 struct lov_stripe_md *lsm_unpackmd_v3(struct lov_obd *lov, void *buf,
 357                                       size_t buf_size)
 358 {
 359         struct lov_mds_md_v3 *lmm = buf;
 360
 361         return lsm_unpackmd_v1v3(lov, buf, buf_size, lmm->lmm_pool_name,
 362                                  lmm->lmm_objects);
 363 }
 364
 365 const struct lsm_operations lsm_v3_ops = {
 366         .lsm_unpackmd           = lsm_unpackmd_v3,
 367 };
 368
 369 static int lsm_verify_comp_md_v1(struct lov_comp_md_v1 *lcm,
 370                                  size_t lcm_buf_size)
 371 {
 372         unsigned int entry_count;
 373         unsigned int i;
 374         size_t lcm_size;
 375
 376         lcm_size = le32_to_cpu(lcm->lcm_size);
 377         if (lcm_buf_size < lcm_size) {
 378                 CERROR("bad LCM buffer size %zu, expected %zu\n",
 379                        lcm_buf_size, lcm_size);
 380                 RETURN(-EINVAL);
 381         }
 382
 383         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 384         for (i = 0; i < entry_count; i++) {
 385                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 386                 size_t blob_offset;
 387                 size_t blob_size;
 388
 389                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 390                 blob_size = le32_to_cpu(lcme->lcme_size);
 391
 392                 if (lcm_size < blob_offset || lcm_size < blob_size ||
 393                     lcm_size < blob_offset + blob_size) {
 394                         CERROR("LCM entry %u has invalid blob: "
 395                                "LCM size = %zu, offset = %zu, size = %zu\n",
 396                                le32_to_cpu(lcme->lcme_id),
 397                                lcm_size, blob_offset, blob_size);
 398                         RETURN(-EINVAL);
 399                 }
 400         }
 401
 402         return 0;
 403 }
 404
 405 static struct lov_stripe_md_entry *
 406 lsme_unpack_comp(struct lov_obd *lov, struct lov_mds_md *lmm,
 407                  size_t lmm_buf_size, bool inited, loff_t *maxbytes)
 408 {
 409         unsigned int magic;
 410         unsigned int stripe_count;
 411
 412         stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 413         if (stripe_count == 0 &&
 414             lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_MDT)
 415                 RETURN(ERR_PTR(-EINVAL));
 416         /* un-instantiated lmm contains no ost id info, i.e. lov_ost_data_v1 */
 417         if (!inited)
 418                 stripe_count = 0;
 419
 420         magic = le32_to_cpu(lmm->lmm_magic);
 421         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 422                 RETURN(ERR_PTR(-EINVAL));
 423
 424         if (lmm_buf_size < lov_mds_md_size(stripe_count, magic))
 425                 RETURN(ERR_PTR(-EINVAL));
 426
 427         if (magic == LOV_MAGIC_V1) {
 428                 return lsme_unpack(lov, lmm, lmm_buf_size, NULL,
 429                                    inited, lmm->lmm_objects, maxbytes);
 430         } else {
 431                 struct lov_mds_md_v3 *lmm3 = (struct lov_mds_md_v3 *)lmm;
 432
 433                 return lsme_unpack(lov, lmm, lmm_buf_size, lmm3->lmm_pool_name,
 434                                    inited, lmm3->lmm_objects, maxbytes);
 435         }
 436 }
 437
 438 static struct lov_stripe_md *
 439 lsm_unpackmd_comp_md_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 440 {
 441         struct lov_comp_md_v1 *lcm = buf;
 442         struct lov_stripe_md *lsm;
 443         size_t lsm_size;
 444         unsigned int entry_count = 0;
 445         unsigned int i;
 446         loff_t maxbytes;
 447         int rc;
 448
 449         rc = lsm_verify_comp_md_v1(buf, buf_size);
 450         if (rc < 0)
 451                 return ERR_PTR(rc);
 452
 453         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 454
 455         lsm_size = offsetof(typeof(*lsm), lsm_entries[entry_count]);
 456         OBD_ALLOC(lsm, lsm_size);
 457         if (!lsm)
 458                 return ERR_PTR(-ENOMEM);
 459
 460         atomic_set(&lsm->lsm_refc, 1);
 461         spin_lock_init(&lsm->lsm_lock);
 462         lsm->lsm_magic = le32_to_cpu(lcm->lcm_magic);
 463         lsm->lsm_layout_gen = le32_to_cpu(lcm->lcm_layout_gen);
 464         lsm->lsm_entry_count = entry_count;
 465         lsm->lsm_mirror_count = le16_to_cpu(lcm->lcm_mirror_count);
 466         lsm->lsm_flags = le16_to_cpu(lcm->lcm_flags);
 467         lsm->lsm_is_released = true;
 468         lsm->lsm_maxbytes = LLONG_MIN;
 469
 470         for (i = 0; i < entry_count; i++) {
 471                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 472                 struct lov_stripe_md_entry *lsme;
 473                 size_t blob_offset;
 474                 size_t blob_size;
 475                 void *blob;
 476
 477                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 478                 blob_size = le32_to_cpu(lcme->lcme_size);
 479                 blob = (char *)lcm + blob_offset;
 480
 481                 lsme = lsme_unpack_comp(lov, blob, blob_size,
 482                                         le32_to_cpu(lcme->lcme_flags) &
 483                                         LCME_FL_INIT,
 484                                         (i == entry_count - 1) ? &maxbytes :
 485                                                                  NULL);
 486                 if (IS_ERR(lsme))
 487                         GOTO(out_lsm, rc = PTR_ERR(lsme));
 488
 489                 if (!(lsme->lsme_pattern & LOV_PATTERN_F_RELEASED))
 490                         lsm->lsm_is_released = false;
 491
 492                 lsm->lsm_entries[i] = lsme;
 493                 lsme->lsme_id = le32_to_cpu(lcme->lcme_id);
 494                 lsme->lsme_flags = le32_to_cpu(lcme->lcme_flags);
 495                 if (lsme->lsme_flags & LCME_FL_NOSYNC)
 496                         lsme->lsme_timestamp =
 497                                 le64_to_cpu(lcme->lcme_timestamp);
 498                 lu_extent_le_to_cpu(&lsme->lsme_extent, &lcme->lcme_extent);
 499
 500                 if (i == entry_count - 1) {
 501                         lsm->lsm_maxbytes = (loff_t)lsme->lsme_extent.e_start +
 502                                             maxbytes;
 503                         /*
 504                          * the last component hasn't been defined, or
 505                          * lsm_maxbytes overflowed.
 506                          */
 507                         if (!lsme_is_dom(lsme) &&
 508                             (lsme->lsme_extent.e_end != LUSTRE_EOF ||
 509                              lsm->lsm_maxbytes <
 510                              (loff_t)lsme->lsme_extent.e_start))
 511                                 lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
 512                 }
 513         }
 514
 515         RETURN(lsm);
 516
 517 out_lsm:
 518         for (i = 0; i < entry_count; i++)
 519                 if (lsm->lsm_entries[i])
 520                         lsme_free(lsm->lsm_entries[i]);
 521
 522         OBD_FREE(lsm, lsm_size);
 523
 524         RETURN(ERR_PTR(rc));
 525 }
 526
 527 const struct lsm_operations lsm_comp_md_v1_ops = {
 528         .lsm_unpackmd         = lsm_unpackmd_comp_md_v1,
 529 };
 530
 531 static struct
 532 lov_stripe_md *lsm_unpackmd_foreign(struct lov_obd *lov, void *buf,
 533                                     size_t buf_size)
 534 {
 535         struct lov_foreign_md *lfm = buf;
 536         struct lov_stripe_md *lsm;
 537         size_t lsm_size;
 538         struct lov_stripe_md_entry *lsme;
 539
 540         lsm_size = offsetof(typeof(*lsm), lsm_entries[1]);
 541         OBD_ALLOC(lsm, lsm_size);
 542         if (lsm == NULL)
 543                 RETURN(ERR_PTR(-ENOMEM));
 544
 545         atomic_set(&lsm->lsm_refc, 1);
 546         spin_lock_init(&lsm->lsm_lock);
 547         lsm->lsm_magic = le32_to_cpu(lfm->lfm_magic);
 548         lsm->lsm_foreign_size = foreign_size_le(lfm);
 549
 550         /* alloc for full foreign EA including format fields */
 551         OBD_ALLOC_LARGE(lsme, lsm->lsm_foreign_size);
 552         if (lsme == NULL) {
 553                 OBD_FREE(lsm, lsm_size);
 554                 RETURN(ERR_PTR(-ENOMEM));
 555         }
 556
 557         /* copy full foreign EA including format fields */
 558         memcpy(lsme, buf, lsm->lsm_foreign_size);
 559
 560         lsm_foreign(lsm) = lsme;
 561
 562         return lsm;
 563 }
 564
 565 const struct lsm_operations lsm_foreign_ops = {
 566         .lsm_unpackmd         = lsm_unpackmd_foreign,
 567 };
 568
 569 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 570 {
 571         int i, j;
 572
 573         CDEBUG_LIMIT(level,
 574                      "lsm %p, objid "DOSTID", maxbytes %#llx, magic 0x%08X, refc: %d, entry: %u, layout_gen %u\n",
 575                lsm, POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 576                atomic_read(&lsm->lsm_refc), lsm->lsm_entry_count,
 577                lsm->lsm_layout_gen);
 578
 579         if (lsm->lsm_magic == LOV_MAGIC_FOREIGN) {
 580                 struct lov_foreign_md *lfm = (void *)lsm_foreign(lsm);
 581
 582                 CDEBUG_LIMIT(level,
 583                              "foreign LOV EA, magic %x, length %u, type %x, flags %x, value '%.*s'\n",
 584                        lfm->lfm_magic, lfm->lfm_length, lfm->lfm_type,
 585                        lfm->lfm_flags, lfm->lfm_length, lfm->lfm_value);
 586                 return;
 587         }
 588
 589         for (i = 0; i < lsm->lsm_entry_count; i++) {
 590                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 591
 592                 CDEBUG(level, DEXT ": id: %u, flags: %x, "
 593                        "magic 0x%08X, layout_gen %u, "
 594                        "stripe count %u, sstripe size %u, "
 595                        "pool: ["LOV_POOLNAMEF"]\n",
 596                        PEXT(&lse->lsme_extent), lse->lsme_id, lse->lsme_flags,
 597                        lse->lsme_magic, lse->lsme_layout_gen,
 598                        lse->lsme_stripe_count, lse->lsme_stripe_size,
 599                        lse->lsme_pool_name);
 600                 if (!lsme_inited(lse) ||
 601                     lse->lsme_pattern & LOV_PATTERN_F_RELEASED)
 602                         continue;
 603                 for (j = 0; j < lse->lsme_stripe_count; j++) {
 604                         CDEBUG(level, "   oinfo:%p: ostid: "DOSTID
 605                                " ost idx: %d gen: %d\n",
 606                                lse->lsme_oinfo[j],
 607                                POSTID(&lse->lsme_oinfo[j]->loi_oi),
 608                                lse->lsme_oinfo[j]->loi_ost_idx,
 609                                lse->lsme_oinfo[j]->loi_ost_gen);
 610                 }
 611         }
 612 }
 613
 614 int lov_lsm_entry(const struct lov_stripe_md *lsm, __u64 offset)
 615 {
 616         int i;
 617
 618         for (i = 0; i < lsm->lsm_entry_count; i++) {
 619                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 620
 621                 if ((offset >= lse->lsme_extent.e_start &&
 622                      offset < lse->lsme_extent.e_end) ||
 623                     (offset == OBD_OBJECT_EOF &&
 624                      lse->lsme_extent.e_end == OBD_OBJECT_EOF))
 625                         return i;
 626         }
 627
 628         return -1;
 629 }