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