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 #ifndef EXPORT_SYMTAB
  26 # define EXPORT_SYMTAB
  27 #endif
  28 #define DEBUG_SUBSYSTEM S_LOV
  29 #ifndef __KERNEL__
  30 #include <liblustre.h>
  31 #endif
  32
  33 #include <linux/lustre_net.h>
  34 #include <linux/obd.h>
  35 #include <linux/obd_lov.h>
  36 #include <linux/obd_class.h>
  37 #include <linux/obd_support.h>
  38 #include <lustre/lustre_user.h>
  39
  40 #include "lov_internal.h"
  41
  42 void lov_dump_lmm_v0(int level, struct lov_mds_md_v0 *lmm)
  43 {
  44         int i, num_ost, stripe, idx;
  45
  46         num_ost = le32_to_cpu(lmm->lmm_ost_count);
  47         idx = le32_to_cpu(lmm->lmm_stripe_offset);
  48         CDEBUG(level, "objid "LPX64", magic 0x%08X, ost_count %u\n",
  49                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
  50                num_ost);
  51         CDEBUG(level,"stripe_size %u, stripe_count %u, stripe_offset %u\n",
  52                le32_to_cpu(lmm->lmm_stripe_size),
  53                le32_to_cpu(lmm->lmm_stripe_count), idx);
  54         for (i = stripe = 0; i < le32_to_cpu(lmm->lmm_ost_count); i++, idx++) {
  55                 idx %= num_ost;
  56                 if (lmm->lmm_objects[idx].l_object_id == 0)
  57                         continue;
  58                 CDEBUG(level, "stripe %u idx %u subobj "LPX64"\n", stripe, idx,
  59                        le64_to_cpu(lmm->lmm_objects[idx].l_object_id));
  60                 stripe++;
  61         }
  62 }
  63
  64 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  65 {
  66         struct lov_ost_data_v1 *lod;
  67         int i;
  68
  69         CDEBUG(level, "objid "LPX64", magic 0x%08X, pattern %#X\n",
  70                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
  71                le32_to_cpu(lmm->lmm_pattern));
  72         CDEBUG(level,"stripe_size %u, stripe_count %u\n",
  73                le32_to_cpu(lmm->lmm_stripe_size),
  74                le32_to_cpu(lmm->lmm_stripe_count));
  75         for (i = 0, lod = lmm->lmm_objects;
  76              i < le32_to_cpu(lmm->lmm_stripe_count); i++, lod++)
  77                 CDEBUG(level, "stripe %u idx %u subobj "LPX64"/"LPX64"\n",
  78                        i, le32_to_cpu(lod->l_ost_idx),
  79                        le64_to_cpu(lod->l_object_gr),
  80                        le64_to_cpu(lod->l_object_id));
  81 }
  82
  83 #define LMM_ASSERT(test)                                                \
  84 do {                                                                    \
  85         if (!(test)) lov_dump_lmm(D_ERROR, lmm);                        \
  86         LASSERT(test); /* so we know what assertion failed */           \
  87 } while(0)
  88
  89 /* Pack LOV object metadata for disk storage.  It is packed in LE byte
  90  * order and is opaque to the networking layer.
  91  *
  92  * XXX In the future, this will be enhanced to get the EA size from the
  93  *     underlying OSC device(s) to get their EA sizes so we can stack
  94  *     LOVs properly.  For now lov_mds_md_size() just assumes one obd_id
  95  *     per stripe.
  96  */
  97 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
  98                struct lov_stripe_md *lsm)
  99 {
 100         struct obd_device *obd = class_exp2obd(exp);
 101         struct lov_obd *lov = &obd->u.lov;
 102         struct lov_oinfo *loi;
 103         struct lov_mds_md *lmm;
 104         int stripe_count = lov->desc.ld_tgt_count;
 105         int lmm_size;
 106         int i;
 107         ENTRY;
 108
 109         if (lsm) {
 110                 if (lsm->lsm_magic != LOV_MAGIC) {
 111                         CWARN("bad LOV MAGIC: 0x%08X != 0x%08X\n",
 112                                lsm->lsm_magic, LOV_MAGIC);
 113                         RETURN(-EINVAL);
 114                 }
 115                 stripe_count = lsm->lsm_stripe_count;
 116         }
 117
 118         /* XXX LOV STACKING call into osc for sizes */
 119         lmm_size = lov_mds_md_size(stripe_count);
 120
 121         if (!lmmp)
 122                 RETURN(lmm_size);
 123
 124         if (*lmmp && !lsm) {
 125                 stripe_count = le32_to_cpu((*lmmp)->lmm_stripe_count);
 126                 OBD_FREE(*lmmp, lov_mds_md_size(stripe_count));
 127                 *lmmp = NULL;
 128                 RETURN(0);
 129         }
 130
 131         if (!*lmmp) {
 132                 OBD_ALLOC(*lmmp, lmm_size);
 133                 if (!*lmmp)
 134                         RETURN(-ENOMEM);
 135         }
 136
 137         lmm = *lmmp;
 138         lmm->lmm_magic = cpu_to_le32(LOV_MAGIC); /* only write new format */
 139
 140         if (!lsm)
 141                 RETURN(lmm_size);
 142
 143         lmm->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
 144         lmm->lmm_object_gr = cpu_to_le64(lsm->lsm_object_gr);
 145         lmm->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
 146         lmm->lmm_stripe_count = cpu_to_le32(stripe_count);
 147         lmm->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
 148
 149         for (i = 0, loi = lsm->lsm_oinfo; i < stripe_count; i++, loi++) {
 150                 /* XXX LOV STACKING call down to osc_packmd() to do packing */
 151                 LASSERT(loi->loi_id);
 152                 lmm->lmm_objects[i].l_object_id = cpu_to_le64(loi->loi_id);
 153                 lmm->lmm_objects[i].l_object_gr = cpu_to_le64(loi->loi_gr);
 154                 lmm->lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 155                 lmm->lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 156         }
 157
 158         RETURN(lmm_size);
 159 }
 160
 161 int lov_get_stripecnt(struct lov_obd *lov, int stripe_count)
 162 {
 163         if (!stripe_count)
 164                 stripe_count = lov->desc.ld_default_stripe_count;
 165         if (!stripe_count || stripe_count > lov->desc.ld_active_tgt_count)
 166                 stripe_count = lov->desc.ld_active_tgt_count;
 167
 168         return stripe_count;
 169 }
 170
 171 static int lov_verify_lmm_v0(struct lov_mds_md_v0 *lmm, int lmm_bytes,
 172                              int *stripe_count)
 173 {
 174         if (lmm_bytes < sizeof(*lmm)) {
 175                 CERROR("lov_mds_md too small: %d, need at least %d\n",
 176                        lmm_bytes, (int)sizeof(*lmm));
 177                 return -EINVAL;
 178         }
 179
 180         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 181
 182         if (*stripe_count == 0 ||
 183             *stripe_count > le32_to_cpu(lmm->lmm_ost_count)) {
 184                 CERROR("bad stripe count %d\n", *stripe_count);
 185                 lov_dump_lmm_v0(D_WARNING, lmm);
 186                 return -EINVAL;
 187         }
 188
 189         if (lmm_bytes < lov_mds_md_v0_size(*stripe_count)) {
 190                 CERROR("LOV EA too small: %d, need %d\n",
 191                        lmm_bytes, lov_mds_md_v0_size(*stripe_count));
 192                 lov_dump_lmm_v0(D_WARNING, lmm);
 193                 return -EINVAL;
 194         }
 195
 196         if (lmm->lmm_object_id == 0) {
 197                 CERROR("zero object id\n");
 198                 lov_dump_lmm_v0(D_WARNING, lmm);
 199                 return -EINVAL;
 200         }
 201
 202         if (le32_to_cpu(lmm->lmm_stripe_offset) >
 203             le32_to_cpu(lmm->lmm_ost_count)) {
 204                 CERROR("stripe offset %d more than number of OSTs %d\n",
 205                        le32_to_cpu(lmm->lmm_stripe_offset),
 206                        le32_to_cpu(lmm->lmm_ost_count));
 207                 lov_dump_lmm_v0(D_WARNING, lmm);
 208                 return -EINVAL;
 209         }
 210
 211         if (lmm->lmm_stripe_size == 0) {
 212                 CERROR("zero stripe size\n");
 213                 lov_dump_lmm_v0(D_WARNING, lmm);
 214                 return -EINVAL;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int lov_verify_lmm_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 221                              int *stripe_count)
 222 {
 223         if (lmm_bytes < sizeof(*lmm)) {
 224                 CERROR("lov_mds_md too small: %d, need at least %d\n",
 225                        lmm_bytes, (int)sizeof(*lmm));
 226                 return -EINVAL;
 227         }
 228
 229         if (lmm->lmm_magic != le32_to_cpu(LOV_MAGIC_V1)) {
 230                 CERROR("bad disk LOV MAGIC: 0x%08X\n",
 231                        le32_to_cpu(*(__u32 *)lmm));
 232                 return -EINVAL;
 233         }
 234
 235         *stripe_count = le32_to_cpu(lmm->lmm_stripe_count);
 236
 237         if (*stripe_count == 0) {
 238                 CERROR("bad stripe count %d\n", *stripe_count);
 239                 lov_dump_lmm_v1(D_WARNING, lmm);
 240                 return -EINVAL;
 241         }
 242
 243         if (lmm_bytes < lov_mds_md_v1_size(*stripe_count)) {
 244                 CERROR("LOV EA too small: %d, need %d\n",
 245                        lmm_bytes, lov_mds_md_v1_size(*stripe_count));
 246                 lov_dump_lmm_v1(D_WARNING, lmm);
 247                 return -EINVAL;
 248         }
 249
 250         if (lmm->lmm_object_id == 0) {
 251                 CERROR("zero object id\n");
 252                 lov_dump_lmm_v1(D_WARNING, lmm);
 253                 return -EINVAL;
 254         }
 255
 256         if (lmm->lmm_pattern != cpu_to_le32(LOV_PATTERN_RAID0)) {
 257                 CERROR("bad striping pattern\n");
 258                 lov_dump_lmm_v1(D_WARNING, lmm);
 259                 return -EINVAL;
 260         }
 261
 262         if (lmm->lmm_stripe_size == 0 ||
 263             (__u64)le32_to_cpu(lmm->lmm_stripe_size) * *stripe_count > ~0UL) {
 264                 CERROR("bad stripe size %u\n",
 265                        le32_to_cpu(lmm->lmm_stripe_size));
 266                 lov_dump_lmm_v1(D_WARNING, lmm);
 267                 return -EINVAL;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int lov_verify_lmm(void *lmm, int lmm_bytes, int *stripe_count)
 274 {
 275         switch (le32_to_cpu(*(__u32 *)lmm)) {
 276         case LOV_MAGIC_V1:
 277                 return lov_verify_lmm_v1(lmm, lmm_bytes, stripe_count);
 278         case LOV_MAGIC_V0:
 279                 return lov_verify_lmm_v0(lmm, lmm_bytes, stripe_count);
 280         default:
 281                 CERROR("bad disk LOV MAGIC: 0x%08X\n",
 282                        le32_to_cpu(*(__u32 *)lmm));
 283                 return -EINVAL;
 284         }
 285 }
 286
 287 int lov_alloc_memmd(struct lov_stripe_md **lsmp, int stripe_count, int pattern)
 288 {
 289         int lsm_size = lov_stripe_md_size(stripe_count);
 290         struct lov_oinfo *loi;
 291         int i;
 292
 293         OBD_ALLOC(*lsmp, lsm_size);
 294         if (!*lsmp)
 295                 return -ENOMEM;
 296
 297         (*lsmp)->lsm_magic = LOV_MAGIC;
 298         (*lsmp)->lsm_stripe_count = stripe_count;
 299         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES * stripe_count;
 300         (*lsmp)->lsm_xfersize = PTLRPC_MAX_BRW_SIZE * stripe_count;
 301         (*lsmp)->lsm_pattern = pattern;
 302         (*lsmp)->lsm_oinfo[0].loi_ost_idx = ~0;
 303         (*lsmp)->lsm_oinfo[0].loi_ost_gen = ~0;
 304
 305         for (i = 0, loi = (*lsmp)->lsm_oinfo; i < stripe_count; i++, loi++)
 306                 loi_init(loi);
 307
 308         return lsm_size;
 309 }
 310 EXPORT_SYMBOL(lov_alloc_memmd);
 311
 312 void lov_free_memmd(struct lov_stripe_md **lsmp)
 313 {
 314         OBD_FREE(*lsmp, lov_stripe_md_size((*lsmp)->lsm_stripe_count));
 315         *lsmp = NULL;
 316 }
 317 EXPORT_SYMBOL(lov_free_memmd);
 318
 319 int lov_unpackmd_v0(struct lov_obd *lov, struct lov_stripe_md *lsm,
 320                     struct lov_mds_md_v0 *lmm)
 321 {
 322         struct lov_oinfo *loi;
 323         int i, ost_offset, ost_count;
 324
 325         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 326         /* lsm->lsm_object_gr = 0; implicit */
 327         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 328         lsm->lsm_xfersize = lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 329         lsm->lsm_pattern = LOV_PATTERN_RAID0;
 330         ost_offset = le32_to_cpu(lmm->lmm_stripe_offset);
 331         ost_count = le16_to_cpu(lmm->lmm_ost_count);
 332
 333         for (i = 0, loi = lsm->lsm_oinfo; i < ost_count; i++, ost_offset++) {
 334                 ost_offset %= ost_count;
 335
 336                 if (!lmm->lmm_objects[ost_offset].l_object_id)
 337                         continue;
 338
 339                 loi->loi_id =
 340                         le64_to_cpu(lmm->lmm_objects[ost_offset].l_object_id);
 341                 /* loi->loi_gr = 0; implicit */
 342                 loi->loi_ost_idx = ost_offset;
 343                 loi->loi_ost_gen = 1;
 344                 loi++;
 345         }
 346
 347         if (loi - lsm->lsm_oinfo != lsm->lsm_stripe_count) {
 348                 CERROR("missing objects in lmm struct\n");
 349                 lov_dump_lmm_v0(D_WARNING, lmm);
 350                 return -EINVAL;
 351         }
 352
 353         return 0;
 354 }
 355
 356 int lov_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 357                     struct lov_mds_md_v1 *lmm)
 358 {
 359         struct lov_oinfo *loi;
 360         int i;
 361
 362         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 363         lsm->lsm_object_gr = le64_to_cpu(lmm->lmm_object_gr);
 364         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 365         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 366         lsm->lsm_xfersize = lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 367
 368         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++) {
 369                 /* XXX LOV STACKING call down to osc_unpackmd() */
 370                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 371                 loi->loi_gr = le64_to_cpu(lmm->lmm_objects[i].l_object_gr);
 372                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 373                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 374                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 375                         CERROR("OST index %d more than OST count %d. "
 376                                "MDS and client use different OST sets?\n",
 377                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 378                         lov_dump_lmm_v1(D_WARNING, lmm);
 379                         return -EINVAL;
 380                 }
 381                 loi++;
 382         }
 383
 384         return 0;
 385 }
 386
 387 /* Unpack LOV object metadata from disk storage.  It is packed in LE byte
 388  * order and is opaque to the networking layer.
 389  */
 390 int lov_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 391                  struct lov_mds_md *lmm, int lmm_bytes)
 392 {
 393         struct obd_device *obd = class_exp2obd(exp);
 394         struct lov_obd *lov = &obd->u.lov;
 395         int rc = 0, stripe_count, lsm_size;
 396         ENTRY;
 397
 398         /* If passed an MDS struct use values from there, otherwise defaults */
 399         if (lmm) {
 400                 rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
 401                 if (rc)
 402                         RETURN(rc);
 403         } else {
 404                 stripe_count = lov_get_stripecnt(lov, 0);
 405         }
 406
 407         /* If we aren't passed an lsmp struct, we just want the size */
 408         if (!lsmp)
 409                 /* XXX LOV STACKING call into osc for sizes */
 410                 RETURN(lov_stripe_md_size(stripe_count));
 411
 412         /* If we are passed an allocated struct but nothing to unpack, free */
 413         if (*lsmp && !lmm) {
 414                 lov_free_memmd(lsmp);
 415                 RETURN(0);
 416         }
 417
 418         lsm_size = lov_alloc_memmd(lsmp, stripe_count, LOV_PATTERN_RAID0);
 419         if (lsm_size < 0)
 420                 RETURN(lsm_size);
 421
 422         /* If we are passed a pointer but nothing to unpack, we only alloc */
 423         if (!lmm)
 424                 RETURN(lsm_size);
 425
 426         switch (le32_to_cpu(lmm->lmm_magic)) {
 427         case LOV_MAGIC_V1:
 428                 rc = lov_unpackmd_v1(lov, *lsmp, lmm);
 429                 break;
 430         case LOV_MAGIC_V0:
 431                 rc = lov_unpackmd_v0(lov, *lsmp, (void *)lmm);
 432                 break;
 433         }
 434
 435         if (rc) {
 436                 lov_free_memmd(lsmp);
 437                 RETURN(rc);
 438         }
 439
 440         RETURN(lsm_size);
 441 }
 442
 443 /* Configure object striping information on a new file.
 444  *
 445  * @lmmu is a pointer to a user struct with one or more of the fields set to
 446  * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 447  * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 448  * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 449  */
 450 int lov_setstripe(struct obd_export *exp, struct lov_stripe_md **lsmp,
 451                   struct lov_user_md *lump)
 452 {
 453         struct obd_device *obd = class_exp2obd(exp);
 454         struct lov_obd *lov = &obd->u.lov;
 455         struct lov_user_md lum;
 456         int stripe_count;
 457         int rc;
 458         ENTRY;
 459
 460         rc = copy_from_user(&lum, lump, sizeof(lum));
 461         if (rc)
 462                 RETURN(-EFAULT);
 463
 464         if (lum.lmm_magic != LOV_USER_MAGIC) {
 465                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#08x != %#08x\n",
 466                        lum.lmm_magic, LOV_USER_MAGIC);
 467                 RETURN(-EINVAL);
 468         }
 469
 470         if (lum.lmm_pattern == 0) {
 471                 lum.lmm_pattern = lov->desc.ld_pattern ?
 472                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 473         }
 474
 475         if (lum.lmm_pattern != LOV_PATTERN_RAID0) {
 476                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 477                        lum.lmm_pattern);
 478                 RETURN(-EINVAL);
 479         }
 480
 481         if (lum.lmm_stripe_size & (PAGE_SIZE - 1)) {
 482                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %lu\n",
 483                        lum.lmm_stripe_size, PAGE_SIZE);
 484                 RETURN(-EINVAL);
 485         }
 486
 487         if ((lum.lmm_stripe_offset >= lov->desc.ld_active_tgt_count) &&
 488             (lum.lmm_stripe_offset != (typeof(lum.lmm_stripe_offset))(-1))) {
 489                 CDEBUG(D_IOCTL, "stripe offset %u > number of active OSTs %u\n",
 490                        lum.lmm_stripe_offset, lov->desc.ld_active_tgt_count);
 491                 RETURN(-EINVAL);
 492         }
 493         stripe_count = lov_get_stripecnt(lov, lum.lmm_stripe_count);
 494
 495         if ((__u64)lum.lmm_stripe_size * stripe_count > ~0UL) {
 496                 CDEBUG(D_IOCTL, "stripe width %ux%u > %lu on 32-bit system\n",
 497                        lum.lmm_stripe_size, (int)lum.lmm_stripe_count, ~0UL);
 498                 RETURN(-EINVAL);
 499         }
 500
 501         rc = lov_alloc_memmd(lsmp, stripe_count, lum.lmm_pattern);
 502
 503         if (rc < 0)
 504                 RETURN(rc);
 505
 506         (*lsmp)->lsm_oinfo[0].loi_ost_idx = lum.lmm_stripe_offset;
 507         /* XXX - what about loi_ost_gen ? */
 508         (*lsmp)->lsm_stripe_size = lum.lmm_stripe_size;
 509         (*lsmp)->lsm_xfersize = lum.lmm_stripe_size * stripe_count;
 510
 511         RETURN(0);
 512 }
 513
 514 int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
 515               struct lov_user_md *lump)
 516 {
 517         int i;
 518         int rc;
 519         struct obd_export *oexp;
 520         struct lov_obd *lov = &exp->exp_obd->u.lov;
 521         obd_id last_id = 0;
 522
 523         for (i = 0; i < lump->lmm_stripe_count; i++) {
 524                 struct lov_tgt_desc *tgt;
 525                 __u32 len = sizeof(last_id);
 526
 527                 tgt = lov->tgts + lump->lmm_objects[i].l_ost_idx;
 528                 if (!lov_tgt_active(lov, tgt, lump->lmm_objects[i].l_ost_gen)) {
 529                         CERROR("Object on ost idx %d: osc inactive.\n",
 530                                lump->lmm_objects[i].l_ost_idx);
 531                         continue;
 532                 }
 533
 534                 oexp = tgt->ltd_exp;
 535                 rc = obd_get_info(oexp, strlen("last_id"), "last_id",
 536                                   &len, &last_id);
 537                 lov_tgt_decref(lov, tgt);
 538                 if (rc)
 539                         RETURN(rc);
 540                 if (lump->lmm_objects[i].l_object_id > last_id) {
 541                         CERROR("Setting EA for object > than last id on "
 542                                "ost idx %d "LPD64" > "LPD64" \n",
 543                                lump->lmm_objects[i].l_ost_idx,
 544                                lump->lmm_objects[i].l_object_id, last_id);
 545                         RETURN(-EINVAL);
 546                 }
 547         }
 548
 549         rc = lov_setstripe(exp, lsmp, lump);
 550         if (rc)
 551                 RETURN(rc);
 552
 553         for (i = 0; i < lump->lmm_stripe_count; i++) {
 554                 (*lsmp)->lsm_oinfo[i].loi_ost_idx =
 555                         lump->lmm_objects[i].l_ost_idx;
 556                 (*lsmp)->lsm_oinfo[i].loi_ost_gen =
 557                         lump->lmm_objects[i].l_ost_gen;
 558                 (*lsmp)->lsm_oinfo[i].loi_id = lump->lmm_objects[i].l_object_id;
 559                 (*lsmp)->lsm_oinfo[i].loi_gr = lump->lmm_objects[i].l_object_gr;
 560         }
 561         RETURN(0);
 562 }
 563
 564
 565 /* Retrieve object striping information.
 566  *
 567  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 568  * the maximum number of OST indices which will fit in the user buffer.
 569  * lmm_magic must be LOV_USER_MAGIC.
 570  */
 571 int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
 572                   struct lov_user_md *lump)
 573 {
 574         struct lov_user_md lum;
 575         struct lov_mds_md *lmmk = NULL;
 576         int rc, lmm_size;
 577         ENTRY;
 578
 579         if (!lsm)
 580                 RETURN(-ENODATA);
 581
 582         rc = copy_from_user(&lum, lump, sizeof(lum));
 583         if (rc)
 584                 RETURN(-EFAULT);
 585
 586         if (lum.lmm_magic != LOV_USER_MAGIC)
 587                 RETURN(-EINVAL);
 588
 589         rc = lov_packmd(exp, &lmmk, lsm);
 590         if (rc < 0)
 591                 RETURN(rc);
 592         lmm_size = rc;
 593         rc = 0;
 594
 595         /* FIXME: Bug 1185 - copy fields properly when structs change */
 596         LASSERT(sizeof(lum) == sizeof(*lmmk));
 597         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));
 598
 599         /* User wasn't expecting this many OST entries */
 600         if (lum.lmm_stripe_count == 0) {
 601                 rc = copy_to_user(lump, lmmk, sizeof(lum));
 602                 if (rc)
 603                         rc = -EFAULT;
 604         } else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count) {
 605                 rc = -EOVERFLOW;
 606         } else if (copy_to_user(lump, lmmk, lmm_size)) {
 607                 rc = -EFAULT;
 608         }
 609
 610         obd_free_diskmd(exp, &lmmk);
 611
 612         RETURN(rc);
 613 }