lustre/lov/lov_pack.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Andreas Dilger <adilger@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * (Un)packing of OST/MDS requests
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_LOV
  27 #ifndef __KERNEL__
  28 #include <liblustre.h>
  29 #endif
  30
  31 #include <linux/lustre_net.h>
  32 #include <linux/obd.h>
  33 #include <linux/obd_lov.h>
  34 #include <linux/obd_class.h>
  35 #include <linux/obd_support.h>
  36 #include <linux/lustre_user.h>
  37
  38 #include "lov_internal.h"
  39
  40 void lov_dump_lmm_v0(int level, struct lov_mds_md_v0 *lmm)
  41 {
  42         int i, num_ost, stripe, idx;
  43
  44         num_ost = le32_to_cpu(lmm->lmm_ost_count);
  45         idx = le32_to_cpu(lmm->lmm_stripe_offset);
  46         CDEBUG(level, "objid "LPX64", magic 0x%08X, ost_count %u\n",
  47                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
  48                num_ost);
  49         CDEBUG(level,"stripe_size %u, stripe_count %u, stripe_offset %u\n",
  50                le32_to_cpu(lmm->lmm_stripe_size),
  51                le32_to_cpu(lmm->lmm_stripe_count), idx);
  52         for (i = stripe = 0; i < le32_to_cpu(lmm->lmm_ost_count); i++, idx++) {
  53                 idx %= num_ost;
  54                 if (lmm->lmm_objects[idx].l_object_id == 0)
  55                         continue;
  56                 CDEBUG(level, "stripe %u idx %u subobj "LPX64"\n", stripe, idx,
  57                        le64_to_cpu(lmm->lmm_objects[idx].l_object_id));
  58                 stripe++;
  59         }
  60 }
  61
  62 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  63 {
  64         struct lov_ost_data_v1 *lod;
  65         int i;
  66
  67         CDEBUG(level, "objid "LPX64", magic 0x%08X, pattern %#X\n",
  68                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
  69                le32_to_cpu(lmm->lmm_pattern));
  70         CDEBUG(level,"stripe_size %u, stripe_count %u\n",
  71                le32_to_cpu(lmm->lmm_stripe_size),
  72                le32_to_cpu(lmm->lmm_stripe_count));
  73         for (i = 0, lod = lmm->lmm_objects;
  74              i < le32_to_cpu(lmm->lmm_stripe_count); i++, lod++)
  75                 CDEBUG(level, "stripe %u idx %u subobj "LPX64"/"LPX64"\n",
  76                        i, le32_to_cpu(lod->l_ost_idx),
  77                        le64_to_cpu(lod->l_object_gr),
  78                        le64_to_cpu(lod->l_object_id));
  79 }
  80
  81 #define LMM_ASSERT(test)                                                \
  82 do {                                                                    \
  83         if (!(test)) lov_dump_lmm(D_ERROR, lmm);                        \
  84         LASSERT(test); /* so we know what assertion failed */           \
  85 } while(0)
  86
  87 /* Pack LOV object metadata for disk storage.  It is packed in LE byte
  88  * order and is opaque to the networking layer.
  89  *
  90  * XXX In the future, this will be enhanced to get the EA size from the
  91  *     underlying OSC device(s) to get their EA sizes so we can stack
  92  *     LOVs properly.  For now lov_mds_md_size() just assumes one obd_id
  93  *     per stripe.
  94  */
  95 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
  96                struct lov_stripe_md *lsm)
  97 {
  98         struct obd_device *obd = class_exp2obd(exp);
  99         struct lov_obd *lov = &obd->u.lov;
 100         struct lov_oinfo *loi;
 101         struct lov_mds_md *lmm;
 102         int stripe_count = lov->desc.ld_tgt_count;
 103         int lmm_size;
 104         int i;
 105         ENTRY;
 106
 107         if (lsm) {
 108                 if (lsm->lsm_magic != LOV_MAGIC) {
 109                         CERROR("bad mem LOV MAGIC: 0x%08X != 0x%08X\n",
 110                                lsm->lsm_magic, LOV_MAGIC);
 111                         RETURN(-EINVAL);
 112                 }
 113                 stripe_count = lsm->lsm_stripe_count;
 114         }
 115
 116         /* XXX LOV STACKING call into osc for sizes */
 117         lmm_size = lov_mds_md_size(stripe_count);
 118
 119         if (!lmmp)
 120                 RETURN(lmm_size);
 121
 122         if (*lmmp && !lsm) {
 123                 stripe_count = le32_to_cpu((*lmmp)->lmm_stripe_count);
 124                 OBD_FREE(*lmmp, lov_mds_md_size(stripe_count));
 125                 *lmmp = NULL;
 126                 RETURN(0);
 127         }
 128
 129         if (!*lmmp) {
 130                 OBD_ALLOC(*lmmp, lmm_size);
 131                 if (!*lmmp)
 132                         RETURN(-ENOMEM);
 133         }
 134
 135         lmm = *lmmp;
 136         lmm->lmm_magic = cpu_to_le32(LOV_MAGIC); /* only write new format */
 137
 138         if (!lsm)
 139                 RETURN(lmm_size);
 140
 141         lmm->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
 142         lmm->lmm_object_gr = cpu_to_le64(lsm->lsm_object_gr);
 143         lmm->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
 144         lmm->lmm_stripe_count = cpu_to_le32(stripe_count);
 145         lmm->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
 146
 147         for (i = 0, loi = lsm->lsm_oinfo; i < stripe_count; i++, loi++) {
 148                 /* XXX LOV STACKING call down to osc_packmd() to do packing */
 149                 LASSERT(loi->loi_id);
 150                 lmm->lmm_objects[i].l_object_id = cpu_to_le64(loi->loi_id);
 151                 lmm->lmm_objects[i].l_object_gr = cpu_to_le64(loi->loi_gr);
 152                 lmm->lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 153                 lmm->lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 154         }
 155
 156         RETURN(lmm_size);
 157 }
 158
 159 int lov_get_stripecnt(struct lov_obd *lov, int stripe_count)
 160 {
 161         if (!stripe_count)
 162                 stripe_count = lov->desc.ld_default_stripe_count;
 163         if (!stripe_count || stripe_count > lov->desc.ld_active_tgt_count)
 164                 stripe_count = lov->desc.ld_active_tgt_count;
 165
 166         return stripe_count;
 167 }
 168
 169 static int lov_verify_lmm_v0(struct lov_mds_md_v0 *lmm, int lmm_bytes,
 170                              int *stripe_count)
 171 {
 172         if (lmm_bytes < sizeof(*lmm)) {
 173                 CERROR("lov_mds_md too small: %d, need at least %d\n",
 174                        lmm_bytes, (int)sizeof(*lmm));
 175                 return -EINVAL;
 176         }
 177
 178         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 179
 180         if (*stripe_count == 0 ||
 181             *stripe_count > le32_to_cpu(lmm->lmm_ost_count)) {
 182                 CERROR("bad stripe count %d\n", *stripe_count);
 183                 lov_dump_lmm_v0(D_WARNING, lmm);
 184                 return -EINVAL;
 185         }
 186
 187         if (lmm_bytes < lov_mds_md_v0_size(*stripe_count)) {
 188                 CERROR("LOV EA too small: %d, need %d\n",
 189                        lmm_bytes, lov_mds_md_size(*stripe_count));
 190                 lov_dump_lmm_v0(D_WARNING, lmm);
 191                 return -EINVAL;
 192         }
 193
 194         if (lmm->lmm_object_id == 0) {
 195                 CERROR("zero object id\n");
 196                 lov_dump_lmm_v0(D_WARNING, lmm);
 197                 return -EINVAL;
 198         }
 199
 200         if (le32_to_cpu(lmm->lmm_stripe_offset) >
 201             le32_to_cpu(lmm->lmm_ost_count)) {
 202                 CERROR("stripe offset %d more than number of OSTs %d\n",
 203                        le32_to_cpu(lmm->lmm_stripe_offset),
 204                        le32_to_cpu(lmm->lmm_ost_count));
 205                 lov_dump_lmm_v0(D_WARNING, lmm);
 206                 return -EINVAL;
 207         }
 208
 209         if (lmm->lmm_stripe_size == 0) {
 210                 CERROR("zero stripe size\n");
 211                 lov_dump_lmm_v0(D_WARNING, lmm);
 212                 return -EINVAL;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int lov_verify_lmm_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 219                              int *stripe_count)
 220 {
 221         if (lmm_bytes < sizeof(*lmm)) {
 222                 CERROR("lov_mds_md too small: %d, need at least %d\n",
 223                        lmm_bytes, (int)sizeof(*lmm));
 224                 return -EINVAL;
 225         }
 226
 227         if (lmm->lmm_magic != le32_to_cpu(LOV_MAGIC_V1)) {
 228                 CERROR("bad disk LOV MAGIC: 0x%08X\n",
 229                        le32_to_cpu(*(__u32 *)lmm));
 230                 return -EINVAL;
 231         }
 232
 233         *stripe_count = le32_to_cpu(lmm->lmm_stripe_count);
 234
 235         if (*stripe_count == 0) {
 236                 CERROR("bad stripe count %d\n", *stripe_count);
 237                 lov_dump_lmm_v1(D_WARNING, lmm);
 238                 return -EINVAL;
 239         }
 240
 241         if (lmm_bytes < lov_mds_md_size(*stripe_count)) {
 242                 CERROR("LOV EA too small: %d, need %d\n",
 243                        lmm_bytes, lov_mds_md_size(*stripe_count));
 244                 lov_dump_lmm_v1(D_WARNING, lmm);
 245                 return -EINVAL;
 246         }
 247
 248         if (lmm->lmm_object_id == 0) {
 249                 CERROR("zero object id\n");
 250                 lov_dump_lmm_v1(D_WARNING, lmm);
 251                 return -EINVAL;
 252         }
 253
 254         if (lmm->lmm_pattern != cpu_to_le32(LOV_PATTERN_RAID0)) {
 255                 CERROR("bad striping pattern\n");
 256                 lov_dump_lmm_v1(D_WARNING, lmm);
 257                 return -EINVAL;
 258         }
 259
 260         if (lmm->lmm_stripe_size == 0 ||
 261             (__u64)le32_to_cpu(lmm->lmm_stripe_size) * *stripe_count > ~0UL) {
 262                 CERROR("bad stripe size %u\n",
 263                        le32_to_cpu(lmm->lmm_stripe_size));
 264                 lov_dump_lmm_v1(D_WARNING, lmm);
 265                 return -EINVAL;
 266         }
 267
 268         return 0;
 269 }
 270
 271 static int lov_verify_lmm(void *lmm, int lmm_bytes, int *stripe_count)
 272 {
 273         switch (le32_to_cpu(*(__u32 *)lmm)) {
 274         case LOV_MAGIC_V1:
 275                 return lov_verify_lmm_v1(lmm, lmm_bytes, stripe_count);
 276         case LOV_MAGIC_V0:
 277                 return lov_verify_lmm_v0(lmm, lmm_bytes, stripe_count);
 278         default:
 279                 CERROR("bad disk LOV MAGIC: 0x%08X\n",
 280                        le32_to_cpu(*(__u32 *)lmm));
 281                 return -EINVAL;
 282         }
 283 }
 284
 285 int lov_alloc_memmd(struct lov_stripe_md **lsmp, int stripe_count, int pattern)
 286 {
 287         int lsm_size = lov_stripe_md_size(stripe_count);
 288         struct lov_oinfo *loi;
 289         int i;
 290
 291         OBD_ALLOC(*lsmp, lsm_size);
 292         if (!*lsmp)
 293                 return -ENOMEM;
 294
 295         (*lsmp)->lsm_magic = LOV_MAGIC;
 296         (*lsmp)->lsm_stripe_count = stripe_count;
 297         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES * stripe_count;
 298         (*lsmp)->lsm_pattern = pattern;
 299         (*lsmp)->lsm_oinfo[0].loi_ost_idx = ~0;
 300
 301         for (i = 0, loi = (*lsmp)->lsm_oinfo; i < stripe_count; i++, loi++)
 302                 loi_init(loi);
 303
 304         return lsm_size;
 305 }
 306
 307 void lov_free_memmd(struct lov_stripe_md **lsmp)
 308 {
 309         OBD_FREE(*lsmp, lov_stripe_md_size((*lsmp)->lsm_stripe_count));
 310         *lsmp = NULL;
 311 }
 312
 313 int lov_unpackmd_v0(struct lov_obd *lov, struct lov_stripe_md *lsm,
 314                     struct lov_mds_md_v0 *lmm)
 315 {
 316         struct lov_oinfo *loi;
 317         int i, ost_offset, ost_count;
 318
 319         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 320         /* lsm->lsm_object_gr = 0; implicit */
 321         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 322         lsm->lsm_pattern = LOV_PATTERN_RAID0;
 323         ost_offset = le32_to_cpu(lmm->lmm_stripe_offset);
 324         ost_count = le16_to_cpu(lmm->lmm_ost_count);
 325
 326         for (i = 0, loi = lsm->lsm_oinfo; i < ost_count; i++, ost_offset++) {
 327                 ost_offset %= ost_count;
 328
 329                 if (!lmm->lmm_objects[ost_offset].l_object_id)
 330                         continue;
 331
 332                 loi->loi_id =
 333                         le64_to_cpu(lmm->lmm_objects[ost_offset].l_object_id);
 334                 /* loi->loi_gr = 0; implicit */
 335                 loi->loi_ost_idx = ost_offset;
 336                 /* loi->loi_ost_gen = 0; implicit */
 337                 loi++;
 338         }
 339
 340         if (loi - lsm->lsm_oinfo != lsm->lsm_stripe_count) {
 341                 CERROR("missing objects in lmm struct\n");
 342                 lov_dump_lmm_v0(D_WARNING, lmm);
 343                 return -EINVAL;
 344         }
 345
 346         return 0;
 347 }
 348
 349 int lov_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 350                     struct lov_mds_md_v1 *lmm)
 351 {
 352         struct lov_oinfo *loi;
 353         int i;
 354
 355         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 356         lsm->lsm_object_gr = le64_to_cpu(lmm->lmm_object_gr);
 357         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 358         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 359
 360         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++) {
 361                 /* XXX LOV STACKING call down to osc_unpackmd() */
 362                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 363                 loi->loi_gr = le64_to_cpu(lmm->lmm_objects[i].l_object_gr);
 364                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 365                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 366                 if (loi->loi_ost_idx > lov->desc.ld_tgt_count) {
 367                         CERROR("OST index %d more than OST count %d\n",
 368                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 369                         lov_dump_lmm_v1(D_WARNING, lmm);
 370                         return -EINVAL;
 371                 }
 372                 loi++;
 373         }
 374
 375         return 0;
 376 }
 377
 378 /* Unpack LOV object metadata from disk storage.  It is packed in LE byte
 379  * order and is opaque to the networking layer.
 380  */
 381 int lov_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 382                  struct lov_mds_md *lmm, int lmm_bytes)
 383 {
 384         struct obd_device *obd = class_exp2obd(exp);
 385         struct lov_obd *lov = &obd->u.lov;
 386         int rc = 0, stripe_count, lsm_size;
 387         ENTRY;
 388
 389         /* If passed an MDS struct use values from there, otherwise defaults */
 390         if (lmm) {
 391                 rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
 392                 if (rc)
 393                         RETURN(rc);
 394         } else {
 395                 stripe_count = lov_get_stripecnt(lov, 0);
 396         }
 397
 398         /* If we aren't passed an lsmp struct, we just want the size */
 399         if (!lsmp)
 400                 /* XXX LOV STACKING call into osc for sizes */
 401                 RETURN(lov_stripe_md_size(stripe_count));
 402
 403         /* If we are passed an allocated struct but nothing to unpack, free */
 404         if (*lsmp && !lmm) {
 405                 lov_free_memmd(lsmp);
 406                 RETURN(0);
 407         }
 408
 409         lsm_size = lov_alloc_memmd(lsmp, stripe_count, LOV_PATTERN_RAID0);
 410         if (lsm_size < 0)
 411                 RETURN(lsm_size);
 412
 413         /* If we are passed a pointer but nothing to unpack, we only alloc */
 414         if (!lmm)
 415                 RETURN(lsm_size);
 416
 417         switch (le32_to_cpu(lmm->lmm_magic)) {
 418         case LOV_MAGIC_V1:
 419                 rc = lov_unpackmd_v1(lov, *lsmp, lmm);
 420                 break;
 421         case LOV_MAGIC_V0:
 422                 rc = lov_unpackmd_v0(lov, *lsmp, (void *)lmm);
 423                 break;
 424         }
 425
 426         if (rc) {
 427                 lov_free_memmd(lsmp);
 428                 RETURN(rc);
 429         }
 430
 431         RETURN(lsm_size);
 432 }
 433
 434 /* Configure object striping information on a new file.
 435  *
 436  * @lmmu is a pointer to a user struct with one or more of the fields set to
 437  * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 438  * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 439  * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 440  */
 441 int lov_setstripe(struct obd_export *exp, struct lov_stripe_md **lsmp,
 442                   struct lov_user_md *lump)
 443 {
 444         struct obd_device *obd = class_exp2obd(exp);
 445         struct lov_obd *lov = &obd->u.lov;
 446         struct lov_user_md lum;
 447         int stripe_count;
 448         int rc;
 449         ENTRY;
 450
 451         rc = copy_from_user(&lum, lump, sizeof(lum));
 452         if (rc)
 453                 RETURN(-EFAULT);
 454
 455         if (lum.lmm_magic != LOV_USER_MAGIC) {
 456                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#08x != %#08x\n",
 457                        lum.lmm_magic, LOV_USER_MAGIC);
 458                 RETURN(-EINVAL);
 459         }
 460
 461         if (lum.lmm_pattern == 0) {
 462                 lum.lmm_pattern = lov->desc.ld_pattern ?
 463                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 464         }
 465
 466         if (lum.lmm_pattern != LOV_PATTERN_RAID0) {
 467                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 468                        lum.lmm_pattern);
 469                 RETURN(-EINVAL);
 470         }
 471
 472         if (lum.lmm_stripe_size & (PAGE_SIZE - 1)) {
 473                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %lu\n",
 474                        lum.lmm_stripe_size, PAGE_SIZE);
 475                 RETURN(-EINVAL);
 476         }
 477
 478         if ((lum.lmm_stripe_offset >= lov->desc.ld_active_tgt_count) &&
 479             (lum.lmm_stripe_offset != (typeof(lum.lmm_stripe_offset))(-1))) {
 480                 CDEBUG(D_IOCTL, "stripe offset %u > number of active OSTs %u\n",
 481                        lum.lmm_stripe_offset, lov->desc.ld_active_tgt_count);
 482                 RETURN(-EINVAL);
 483         }
 484         stripe_count = lov_get_stripecnt(lov, lum.lmm_stripe_count);
 485
 486         if ((__u64)lum.lmm_stripe_size * stripe_count > ~0UL) {
 487                 CDEBUG(D_IOCTL, "stripe width %ux%u > %lu on 32-bit system\n",
 488                        lum.lmm_stripe_size, (int)lum.lmm_stripe_count, ~0UL);
 489                 RETURN(-EINVAL);
 490         }
 491
 492         rc = lov_alloc_memmd(lsmp, stripe_count, lum.lmm_pattern);
 493
 494         if (rc < 0)
 495                 RETURN(rc);
 496
 497         (*lsmp)->lsm_oinfo[0].loi_ost_idx = lum.lmm_stripe_offset;
 498         (*lsmp)->lsm_stripe_size = lum.lmm_stripe_size;
 499
 500         RETURN(0);
 501 }
 502
 503 int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
 504                   struct lov_user_md *lump)
 505 {
 506         int i;
 507         int rc;
 508         struct obd_export *oexp;
 509         struct lov_obd *lov = &exp->exp_obd->u.lov;
 510         obd_id last_id = 0;
 511
 512         for (i = 0; i < lump->lmm_stripe_count; i++) {
 513                 __u32 len = sizeof(last_id);
 514                 oexp = lov->tgts[lump->lmm_objects[i].l_ost_idx].ltd_exp;
 515                 rc = obd_get_info(oexp, strlen("last_id"), "last_id",
 516                                   &len, &last_id);
 517                 if (rc)
 518                         RETURN(rc);
 519                 if (last_id < lump->lmm_objects[i].l_object_id) {
 520                         CERROR("Setting EA for object > than last id on "
 521                           "ost idx %d "LPD64" > "LPD64" \n",
 522                           lump->lmm_objects[i].l_ost_idx,
 523                           lump->lmm_objects[i].l_object_id, last_id);
 524                         RETURN(-EINVAL);
 525                 }
 526         }
 527
 528         rc = lov_setstripe(exp, lsmp, lump);
 529         if (rc)
 530                 RETURN(rc);
 531         for (i = 0; i < lump->lmm_stripe_count; i++) {
 532                 (*lsmp)->lsm_oinfo[i].loi_ost_idx =
 533                                                  lump->lmm_objects[i].l_ost_idx;
 534                 (*lsmp)->lsm_oinfo[i].loi_id = lump->lmm_objects[i].l_object_id;
 535                 (*lsmp)->lsm_oinfo[i].loi_gr = lump->lmm_objects[i].l_object_gr;
 536         }
 537         RETURN(0);
 538 }
 539
 540
 541 /* Retrieve object striping information.
 542  *
 543  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 544  * the maximum number of OST indices which will fit in the user buffer.
 545  * lmm_magic must be LOV_USER_MAGIC.
 546  */
 547 int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
 548                   struct lov_user_md *lump)
 549 {
 550         struct lov_user_md lum;
 551         struct lov_mds_md *lmmk = NULL;
 552         int rc, lmm_size;
 553         ENTRY;
 554
 555         if (!lsm)
 556                 RETURN(-ENODATA);
 557
 558         rc = copy_from_user(&lum, lump, sizeof(lum));
 559         if (rc)
 560                 RETURN(-EFAULT);
 561
 562         if (lum.lmm_magic != LOV_USER_MAGIC)
 563                 RETURN(-EINVAL);
 564
 565         rc = lov_packmd(exp, &lmmk, lsm);
 566         if (rc < 0)
 567                 RETURN(rc);
 568         lmm_size = rc;
 569         rc = 0;
 570
 571         /* FIXME: Bug 1185 - copy fields properly when structs change */
 572         LASSERT(sizeof(lum) == sizeof(*lmmk));
 573         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));
 574
 575         /* User wasn't expecting this many OST entries */
 576         if (lum.lmm_stripe_count < lmmk->lmm_stripe_count)
 577                 rc = -EOVERFLOW;
 578         else if (copy_to_user(lump, lmmk, lmm_size))
 579                 rc = -EFAULT;
 580
 581         obd_free_diskmd(exp, &lmmk);
 582
 583         RETURN(rc);
 584 }