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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lov/lov_pack.c
  37  *
  38  * (Un)packing of OST/MDS requests
  39  *
  40  * Author: Andreas Dilger <adilger@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_LOV
  44 #ifndef __KERNEL__
  45 #include <liblustre.h>
  46 #endif
  47
  48 #include <lustre_net.h>
  49 #include <obd.h>
  50 #include <obd_lov.h>
  51 #include <obd_class.h>
  52 #include <obd_support.h>
  53 #include <lustre/lustre_user.h>
  54
  55 #include "lov_internal.h"
  56
  57 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  58 {
  59         struct lov_ost_data_v1 *lod;
  60         int i;
  61
  62         CDEBUG(level, "objid "LPX64", magic 0x%08x, pattern %#x\n",
  63                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
  64                le32_to_cpu(lmm->lmm_pattern));
  65         CDEBUG(level,"stripe_size %u, stripe_count %u\n",
  66                le32_to_cpu(lmm->lmm_stripe_size),
  67                le32_to_cpu(lmm->lmm_stripe_count));
  68
  69         if (le32_to_cpu(lmm->lmm_stripe_count) <= LOV_V1_INSANE_STRIPE_COUNT) {
  70                 for (i = 0, lod = lmm->lmm_objects;
  71                      i < (int)le32_to_cpu(lmm->lmm_stripe_count); i++, lod++)
  72                          CDEBUG(level,
  73                                 "stripe %u idx %u subobj "LPX64"/"LPX64"\n",
  74                                 i, le32_to_cpu(lod->l_ost_idx),
  75                                 le64_to_cpu(lod->l_object_gr),
  76                                 le64_to_cpu(lod->l_object_id));
  77         } else {
  78                 CDEBUG(level, "bad stripe_count %u > max_stripe_count %u\n",
  79                        le32_to_cpu(lmm->lmm_stripe_count),
  80                        LOV_V1_INSANE_STRIPE_COUNT);
  81         }
  82 }
  83
  84 void lov_dump_lmm_join(int level, struct lov_mds_md_join *lmmj)
  85 {
  86
  87         CDEBUG(level, "objid "LPX64", magic 0x%08X, pattern %#X\n",
  88                le64_to_cpu(lmmj->lmmj_md.lmm_object_id),
  89                le32_to_cpu(lmmj->lmmj_md.lmm_magic),
  90                le32_to_cpu(lmmj->lmmj_md.lmm_pattern));
  91         CDEBUG(level,"stripe_size %u, stripe_count %u extent_count %u \n",
  92                le32_to_cpu(lmmj->lmmj_md.lmm_stripe_size),
  93                le32_to_cpu(lmmj->lmmj_md.lmm_stripe_count),
  94                le32_to_cpu(lmmj->lmmj_extent_count));
  95 }
  96
  97 void lov_dump_lmm_v3(int level, struct lov_mds_md_v3 *lmm)
  98 {
  99         struct lov_ost_data_v1 *lod;
 100         int i;
 101
 102         CDEBUG(level, "objid "LPX64", magic 0x%08x, pattern %#x\n",
 103                le64_to_cpu(lmm->lmm_object_id), le32_to_cpu(lmm->lmm_magic),
 104                le32_to_cpu(lmm->lmm_pattern));
 105         CDEBUG(level,"stripe_size %u, stripe_count %u\n",
 106                le32_to_cpu(lmm->lmm_stripe_size),
 107                le32_to_cpu(lmm->lmm_stripe_count));
 108         CDEBUG(level,"pool_name "LOV_POOLNAMEF"\n", lmm->lmm_pool_name);
 109
 110         if (le32_to_cpu(lmm->lmm_stripe_count) <= LOV_V1_INSANE_STRIPE_COUNT) {
 111                 for (i = 0, lod = lmm->lmm_objects;
 112                      i < (int)le32_to_cpu(lmm->lmm_stripe_count); i++, lod++)
 113                          CDEBUG(level,
 114                                 "stripe %u idx %u subobj "LPX64"/"LPX64"\n",
 115                                 i, le32_to_cpu(lod->l_ost_idx),
 116                                 le64_to_cpu(lod->l_object_gr),
 117                                 le64_to_cpu(lod->l_object_id));
 118         } else {
 119                 CDEBUG(level, "bad stripe_count %u > max_stripe_count %u\n",
 120                        le32_to_cpu(lmm->lmm_stripe_count),
 121                        LOV_V1_INSANE_STRIPE_COUNT);
 122         }
 123 }
 124
 125 void lov_dump_lmm(int level, void *lmm)
 126 {
 127         int magic;
 128
 129         magic = ((struct lov_mds_md_v1 *)(lmm))->lmm_magic;
 130         switch (magic) {
 131         case LOV_MAGIC_V1:
 132                 return lov_dump_lmm_v1(level, (struct lov_mds_md_v1 *)(lmm));
 133         case LOV_MAGIC_JOIN:
 134                 return lov_dump_lmm_join(level, (struct lov_mds_md_join *)(lmm));
 135         case LOV_MAGIC_V3:
 136                 return lov_dump_lmm_v3(level, (struct lov_mds_md_v3 *)(lmm));
 137         default:
 138                 CERROR("Cannot recognize lmm_magic %x", magic);
 139         }
 140         return;
 141 }
 142
 143 #define LMM_ASSERT(test)                                                \
 144 do {                                                                    \
 145         if (!(test)) lov_dump_lmm(D_ERROR, lmm);                        \
 146         LASSERT(test); /* so we know what assertion failed */           \
 147 } while(0)
 148
 149 /* Pack LOV object metadata for disk storage.  It is packed in LE byte
 150  * order and is opaque to the networking layer.
 151  *
 152  * XXX In the future, this will be enhanced to get the EA size from the
 153  *     underlying OSC device(s) to get their EA sizes so we can stack
 154  *     LOVs properly.  For now lov_mds_md_size() just assumes one obd_id
 155  *     per stripe.
 156  */
 157 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
 158                struct lov_stripe_md *lsm)
 159 {
 160         struct obd_device *obd = class_exp2obd(exp);
 161         struct lov_obd *lov = &obd->u.lov;
 162         struct lov_mds_md_v1 *lmmv1;
 163         struct lov_mds_md_v3 *lmmv3;
 164         struct lov_oinfo *loi;
 165         int stripe_count;
 166         struct lov_ost_data_v1 *lmm_objects;
 167         int lmm_size, lmm_magic;
 168         int i;
 169         ENTRY;
 170
 171         if (lsm) {
 172                 lmm_magic = lsm->lsm_magic;
 173
 174                 if (!lmmp) {
 175                         stripe_count = lov_get_stripecnt(lov,
 176                                                          lsm->lsm_stripe_count);
 177                         lsm->lsm_stripe_count = stripe_count;
 178                 } else {
 179                         stripe_count = lsm->lsm_stripe_count;
 180                 }
 181         } else {
 182                 /* No needs to allocated more than LOV_MAX_STRIPE_COUNT.
 183                  * Anyway, this is pretty inaccurate since ld_tgt_count now
 184                  * represents max index and we should rely on the actual number
 185                  * of OSTs instead */
 186                 stripe_count = min((__u32)LOV_MAX_STRIPE_COUNT,
 187                                    lov->desc.ld_tgt_count);
 188
 189                 if (lmmp && *lmmp)
 190                         lmm_magic = le32_to_cpu((*lmmp)->lmm_magic);
 191                 else
 192                         /* lsm == NULL and lmmp == NULL */
 193                         lmm_magic = LOV_MAGIC;
 194         }
 195
 196         if ((lmm_magic != LOV_MAGIC_V1) &&
 197             (lmm_magic != LOV_MAGIC_V3)) {
 198                 CERROR("bad mem LOV MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
 199                        lmm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
 200                 RETURN(-EINVAL);
 201         }
 202
 203         /* XXX LOV STACKING call into osc for sizes */
 204         lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
 205
 206         if (!lmmp)
 207                 RETURN(lmm_size);
 208
 209         if (*lmmp && !lsm) {
 210                 stripe_count = le32_to_cpu((*lmmp)->lmm_stripe_count);
 211                 lmm_size = lov_mds_md_size(stripe_count, le32_to_cpu((*lmmp)->lmm_magic));
 212                 OBD_FREE(*lmmp, lmm_size);
 213                 *lmmp = NULL;
 214                 RETURN(0);
 215         }
 216
 217         if (!*lmmp) {
 218                 OBD_ALLOC(*lmmp, lmm_size);
 219                 if (!*lmmp)
 220                         RETURN(-ENOMEM);
 221         }
 222
 223         CDEBUG(D_INFO, "lov_packmd: LOV_MAGIC 0x%08X, lmm_size = %d \n",
 224                lmm_magic, lmm_size);
 225
 226         lmmv1 = *lmmp;
 227         lmmv3 = (struct lov_mds_md_v3 *)*lmmp;
 228         if (lmm_magic == LOV_MAGIC_V3)
 229                 lmmv3->lmm_magic = cpu_to_le32(LOV_MAGIC_V3);
 230         else
 231                 lmmv1->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
 232
 233         if (!lsm)
 234                 RETURN(lmm_size);
 235
 236         /* lmmv1 and lmmv3 point to the same struct and have the
 237          * same first fields
 238          */
 239         lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
 240         lmmv1->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
 241         lmmv1->lmm_object_gr = cpu_to_le64(lsm->lsm_object_gr);
 242         lmmv1->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
 243         lmmv1->lmm_stripe_count = cpu_to_le32(stripe_count);
 244         if (lsm->lsm_magic == LOV_MAGIC_V3) {
 245                 strncpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name, LOV_MAXPOOLNAME);
 246                 lmm_objects = lmmv3->lmm_objects;
 247         } else {
 248                 lmm_objects = lmmv1->lmm_objects;
 249         }
 250
 251         for (i = 0; i < stripe_count; i++) {
 252                 loi = lsm->lsm_oinfo[i];
 253                 /* XXX LOV STACKING call down to osc_packmd() to do packing */
 254                 LASSERTF(loi->loi_id, "lmm_oid "LPU64" stripe %u/%u idx %u\n",
 255                          lmmv1->lmm_object_id, i, stripe_count, loi->loi_ost_idx);
 256                 lmm_objects[i].l_object_id = cpu_to_le64(loi->loi_id);
 257                 lmm_objects[i].l_object_gr = cpu_to_le64(loi->loi_gr);
 258                 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 259                 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 260         }
 261
 262         RETURN(lmm_size);
 263 }
 264
 265 /* Find the max stripecount we should use */
 266 int lov_get_stripecnt(struct lov_obd *lov, __u32 stripe_count)
 267 {
 268         if (!stripe_count)
 269                 stripe_count = lov->desc.ld_default_stripe_count;
 270         if (stripe_count > lov->desc.ld_active_tgt_count)
 271                 stripe_count = lov->desc.ld_active_tgt_count;
 272         if (!stripe_count)
 273                 stripe_count = 1;
 274         /* for now, we limit the stripe count directly, when bug 4424 is
 275          * fixed this needs to be somewhat dynamic based on whether ext3
 276          * can handle larger EA sizes. */
 277         if (stripe_count > LOV_MAX_STRIPE_COUNT)
 278                 stripe_count = LOV_MAX_STRIPE_COUNT;
 279
 280         return stripe_count;
 281 }
 282
 283
 284 static int lov_verify_lmm(void *lmm, int lmm_bytes, int *stripe_count)
 285 {
 286         int rc;
 287
 288         if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) {
 289                 char *buffer;
 290                 int sz;
 291
 292                 CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n",
 293                        le32_to_cpu(*(__u32 *)lmm), lmm_bytes);
 294                 sz = lmm_bytes * 2 + 1;
 295                 OBD_ALLOC(buffer, sz);
 296                 if (buffer != NULL) {
 297                         int i;
 298
 299                         for (i = 0; i < lmm_bytes; i++)
 300                                 sprintf(buffer+2*i, "%.2X", ((char *)lmm)[i]);
 301                         buffer[sz] = '\0';
 302                         CERROR("%s\n", buffer);
 303                         OBD_FREE(buffer, sz);
 304                 }
 305                 return -EINVAL;
 306         }
 307         rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm,
 308                                      lmm_bytes, stripe_count);
 309         return rc;
 310 }
 311
 312 int lov_alloc_memmd(struct lov_stripe_md **lsmp, int stripe_count,
 313                       int pattern, int magic)
 314 {
 315         int i, lsm_size;
 316         ENTRY;
 317
 318         CDEBUG(D_INFO, "alloc lsm, stripe_count %d\n", stripe_count);
 319
 320         *lsmp = lsm_alloc_plain(stripe_count, &lsm_size);
 321         if (!*lsmp) {
 322                 CERROR("can't allocate lsmp, stripe_count %d\n", stripe_count);
 323                 RETURN(-ENOMEM);
 324         }
 325
 326         spin_lock_init(&(*lsmp)->lsm_lock);
 327         (*lsmp)->lsm_magic = magic;
 328         (*lsmp)->lsm_stripe_count = stripe_count;
 329         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES * stripe_count;
 330         (*lsmp)->lsm_pattern = pattern;
 331         (*lsmp)->lsm_pool_name[0] = '\0';
 332         (*lsmp)->lsm_oinfo[0]->loi_ost_idx = ~0;
 333
 334         for (i = 0; i < stripe_count; i++)
 335                 loi_init((*lsmp)->lsm_oinfo[i]);
 336
 337         RETURN(lsm_size);
 338 }
 339
 340 void lov_free_memmd(struct lov_stripe_md **lsmp)
 341 {
 342         struct lov_stripe_md *lsm = *lsmp;
 343
 344         LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
 345         lsm_op_find(lsm->lsm_magic)->lsm_free(lsm);
 346
 347         *lsmp = NULL;
 348 }
 349
 350
 351 /* Unpack LOV object metadata from disk storage.  It is packed in LE byte
 352  * order and is opaque to the networking layer.
 353  */
 354 int lov_unpackmd(struct obd_export *exp,  struct lov_stripe_md **lsmp,
 355                  struct lov_mds_md *lmm, int lmm_bytes)
 356 {
 357         struct obd_device *obd = class_exp2obd(exp);
 358         struct lov_obd *lov = &obd->u.lov;
 359         int rc = 0, stripe_count, lsm_size;
 360         __u32 magic;
 361         ENTRY;
 362
 363         /* If passed an MDS struct use values from there, otherwise defaults */
 364         if (lmm) {
 365                 rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
 366                 if (rc)
 367                         RETURN(rc);
 368                 magic = le32_to_cpu(lmm->lmm_magic);
 369         } else {
 370                 stripe_count = lov_get_stripecnt(lov, 0);
 371                 magic = LOV_MAGIC;
 372         }
 373
 374         /* If we aren't passed an lsmp struct, we just want the size */
 375         if (!lsmp) {
 376                 /* XXX LOV STACKING call into osc for sizes */
 377                 LBUG();
 378                 RETURN(lov_stripe_md_size(stripe_count));
 379         }
 380
 381         /* If we are passed an allocated struct but nothing to unpack, free */
 382         if (*lsmp && !lmm) {
 383                 lov_free_memmd(lsmp);
 384                 RETURN(0);
 385         }
 386
 387         lsm_size = lov_alloc_memmd(lsmp, stripe_count, LOV_PATTERN_RAID0,
 388                                    magic);
 389         if (lsm_size < 0)
 390                 RETURN(lsm_size);
 391
 392         /* If we are passed a pointer but nothing to unpack, we only alloc */
 393         if (!lmm)
 394                 RETURN(lsm_size);
 395
 396         LASSERT(lsm_op_find(magic) != NULL);
 397         rc = lsm_op_find(magic)->lsm_unpackmd(lov, *lsmp, lmm);
 398         if (rc) {
 399                 lov_free_memmd(lsmp);
 400                 RETURN(rc);
 401         }
 402
 403         RETURN(lsm_size);
 404 }
 405
 406 /* Configure object striping information on a new file.
 407  *
 408  * @lmmu is a pointer to a user struct with one or more of the fields set to
 409  * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 410  * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 411  * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 412  */
 413 int lov_setstripe(struct obd_export *exp, struct lov_stripe_md **lsmp,
 414                   struct lov_user_md *lump)
 415 {
 416         struct obd_device *obd = class_exp2obd(exp);
 417         struct lov_obd *lov = &obd->u.lov;
 418         struct lov_user_md_v3 lumv3;
 419         struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&lumv3;
 420         int lmm_magic;
 421         int stripe_count;
 422         int rc;
 423         ENTRY;
 424
 425         rc = copy_from_user(&lumv3, lump, sizeof(struct lov_user_md_v1));
 426         if (rc)
 427                 RETURN(-EFAULT);
 428
 429         lmm_magic = lumv1->lmm_magic;
 430
 431         if (lmm_magic == __swab32(LOV_USER_MAGIC_V1)) {
 432                 lustre_swab_lov_user_md_v1(lumv1);
 433                 lmm_magic = LOV_USER_MAGIC_V1;
 434         } else if (lmm_magic == LOV_USER_MAGIC_V3) {
 435                 rc = copy_from_user(&lumv3, lump, sizeof(lumv3));
 436                 if (rc)
 437                         RETURN(-EFAULT);
 438         } else if (lmm_magic == __swab32(LOV_USER_MAGIC_V3)) {
 439                 rc = copy_from_user(&lumv3, lump, sizeof(lumv3));
 440                 if (rc)
 441                         RETURN(-EFAULT);
 442                 lustre_swab_lov_user_md_v3(&lumv3);
 443                 lmm_magic = LOV_USER_MAGIC_V3;
 444         } else if (lmm_magic != LOV_USER_MAGIC_V1) {
 445                 CDEBUG(D_IOCTL,
 446                        "bad userland LOV MAGIC: %#08x != %#08x nor %#08x\n",
 447                        lmm_magic, LOV_USER_MAGIC_V1, LOV_USER_MAGIC_V3);
 448                        RETURN(-EINVAL);
 449         }
 450
 451         /* in the rest of the tests, as *lumv1 and lumv3 have the same
 452          * fields, we use lumv1 to avoid code duplication */
 453
 454         if (lumv1->lmm_pattern == 0) {
 455                 lumv1->lmm_pattern = lov->desc.ld_pattern ?
 456                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 457         }
 458
 459         if (lumv1->lmm_pattern != LOV_PATTERN_RAID0) {
 460                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 461                        lumv1->lmm_pattern);
 462                 RETURN(-EINVAL);
 463         }
 464
 465         /* 64kB is the largest common page size we see (ia64), and matches the
 466          * check in lfs */
 467         if (lumv1->lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
 468                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n",
 469                        lumv1->lmm_stripe_size, LOV_MIN_STRIPE_SIZE);
 470                 lumv1->lmm_stripe_size = LOV_MIN_STRIPE_SIZE;
 471         }
 472
 473         if ((lumv1->lmm_stripe_offset >= lov->desc.ld_tgt_count) &&
 474             (lumv1->lmm_stripe_offset !=
 475              (typeof(lumv1->lmm_stripe_offset))(-1))) {
 476                 CDEBUG(D_IOCTL, "stripe offset %u > number of OSTs %u\n",
 477                        lumv1->lmm_stripe_offset, lov->desc.ld_tgt_count);
 478                 RETURN(-EINVAL);
 479         }
 480
 481         stripe_count = lov_get_stripecnt(lov, lumv1->lmm_stripe_count);
 482
 483         if (lmm_magic == LOV_USER_MAGIC_V3) {
 484                 struct pool_desc *pool;
 485
 486                 pool = lov_find_pool(lov, lumv3.lmm_pool_name);
 487                 if (pool != NULL) {
 488                         if (lumv1->lmm_stripe_offset !=
 489                             (typeof(lumv1->lmm_stripe_offset))(-1)) {
 490                                 rc = lov_check_index_in_pool(
 491                                         lumv1->lmm_stripe_offset, pool);
 492                                 if (rc < 0) {
 493                                         lov_pool_putref(pool);
 494                                         RETURN(-EINVAL);
 495                                 }
 496                         }
 497
 498                         if (stripe_count > pool_tgt_count(pool))
 499                                 stripe_count = pool_tgt_count(pool);
 500
 501                         lov_pool_putref(pool);
 502                 }
 503         }
 504
 505         rc = lov_alloc_memmd(lsmp, stripe_count, lumv1->lmm_pattern, lmm_magic);
 506
 507         if (rc < 0)
 508                 RETURN(rc);
 509
 510         (*lsmp)->lsm_oinfo[0]->loi_ost_idx = lumv1->lmm_stripe_offset;
 511         (*lsmp)->lsm_stripe_size = lumv1->lmm_stripe_size;
 512
 513         if (lmm_magic == LOV_USER_MAGIC_V3)
 514                 strncpy((*lsmp)->lsm_pool_name, lumv3.lmm_pool_name,
 515                         LOV_MAXPOOLNAME);
 516
 517         RETURN(0);
 518 }
 519
 520 int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
 521               struct lov_user_md *lump)
 522 {
 523         int i;
 524         int rc;
 525         struct obd_export *oexp;
 526         struct lov_obd *lov = &exp->exp_obd->u.lov;
 527         obd_id last_id = 0;
 528         struct lov_user_ost_data_v1 *lmm_objects;
 529
 530         ENTRY;
 531
 532         if (lump->lmm_magic == LOV_USER_MAGIC_V3)
 533                 lmm_objects = ((struct lov_user_md_v3 *)lump)->lmm_objects;
 534         else
 535                 lmm_objects = lump->lmm_objects;
 536
 537         for (i = 0; i < lump->lmm_stripe_count; i++) {
 538                 __u32 len = sizeof(last_id);
 539                 oexp = lov->lov_tgts[lmm_objects[i].l_ost_idx]->ltd_exp;
 540                 rc = obd_get_info(oexp, sizeof(KEY_LAST_ID), KEY_LAST_ID,
 541                                   &len, &last_id, NULL);
 542                 if (rc)
 543                         RETURN(rc);
 544                 if (lmm_objects[i].l_object_id > last_id) {
 545                         CERROR("Setting EA for object > than last id on "
 546                                "ost idx %d "LPD64" > "LPD64" \n",
 547                                lmm_objects[i].l_ost_idx,
 548                                lmm_objects[i].l_object_id, last_id);
 549                         RETURN(-EINVAL);
 550                 }
 551         }
 552
 553         rc = lov_setstripe(exp, lsmp, lump);
 554         if (rc)
 555                 RETURN(rc);
 556
 557         for (i = 0; i < lump->lmm_stripe_count; i++) {
 558                 (*lsmp)->lsm_oinfo[i]->loi_ost_idx =
 559                         lmm_objects[i].l_ost_idx;
 560                 (*lsmp)->lsm_oinfo[i]->loi_id = lmm_objects[i].l_object_id;
 561                 (*lsmp)->lsm_oinfo[i]->loi_gr = lmm_objects[i].l_object_gr;
 562         }
 563         RETURN(0);
 564 }
 565
 566
 567 /* Retrieve object striping information.
 568  *
 569  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 570  * the maximum number of OST indices which will fit in the user buffer.
 571  * lmm_magic must be LOV_USER_MAGIC.
 572  */
 573 int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
 574                   struct lov_user_md *lump)
 575 {
 576         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
 577         struct lov_user_md_v3 lum;
 578         struct lov_mds_md *lmmk = NULL;
 579         int rc, lmm_size;
 580         int lum_size;
 581         ENTRY;
 582
 583         if (!lsm)
 584                 RETURN(-ENODATA);
 585         /* we only need the header part from user space to get lmm_magic and
 586          * lmm_stripe_count, (the header part is common to v1 and v3) */
 587         lum_size = sizeof(struct lov_user_md_v1);
 588         rc = copy_from_user(&lum, lump, lum_size);
 589         if (rc)
 590                 RETURN(-EFAULT);
 591         /* if v3 we just have to update the lum_size */
 592         if (lum.lmm_magic == LOV_USER_MAGIC_V3)
 593                 lum_size = sizeof(struct lov_user_md_v3);
 594
 595         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
 596             (lum.lmm_magic != LOV_USER_MAGIC_V3))
 597                 RETURN(-EINVAL);
 598
 599         if (lum.lmm_stripe_count &&
 600             (lum.lmm_stripe_count < lsm->lsm_stripe_count)) {
 601                 /* Return right size of stripe to user */
 602                 lum.lmm_stripe_count = lsm->lsm_stripe_count;
 603                 rc = copy_to_user(lump, &lum, lum_size);
 604                 RETURN(-EOVERFLOW);
 605         }
 606         rc = lov_packmd(exp, &lmmk, lsm);
 607         if (rc < 0)
 608                 RETURN(rc);
 609         lmm_size = rc;
 610         rc = 0;
 611
 612         /* FIXME: Bug 1185 - copy fields properly when structs change */
 613         /* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */
 614         LASSERT(sizeof(lum) == sizeof(struct lov_mds_md_v3));
 615         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));
 616
 617         if ((cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) &&
 618             ((lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1)) ||
 619             (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)))) {
 620                 lustre_swab_lov_mds_md(lmmk);
 621                 lustre_swab_lov_user_md_objects(
 622                         (struct lov_user_ost_data*)lmmk->lmm_objects,
 623                         lmmk->lmm_stripe_count);
 624         }
 625         if (lum.lmm_magic == LOV_USER_MAGIC) {
 626                 /* User request for v1, we need skip lmm_pool_name */
 627                 if (lmmk->lmm_magic == LOV_MAGIC_V3) {
 628                         memmove((char*)(&lmmk->lmm_stripe_count) +
 629                                 sizeof(lmmk->lmm_stripe_count),
 630                                 ((struct lov_mds_md_v3*)lmmk)->lmm_objects,
 631                                 lmmk->lmm_stripe_count *
 632                                 sizeof(struct lov_ost_data_v1));
 633                         lmm_size -= LOV_MAXPOOLNAME;
 634                 }
 635         } else {
 636                 /* if v3 we just have to update the lum_size */
 637                 lum_size = sizeof(struct lov_user_md_v3);
 638         }
 639         /* User wasn't expecting this many OST entries */
 640         if (lum.lmm_stripe_count == 0)
 641                 lmm_size = lum_size;
 642         else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count)
 643                 RETURN(-EOVERFLOW);
 644         /*
 645          * Have a difference between lov_mds_md & lov_user_md.
 646          * So we have to re-order the data before copy to user.
 647          */
 648         lum.lmm_stripe_count = lmmk->lmm_stripe_count;
 649         ((struct lov_user_md*)lmmk)->lmm_stripe_offset = 0;
 650         ((struct lov_user_md*)lmmk)->lmm_stripe_count = lum.lmm_stripe_count;
 651         if (copy_to_user(lump, lmmk, lmm_size))
 652                 rc = -EFAULT;
 653
 654         obd_free_diskmd(exp, &lmmk);
 655
 656         RETURN(rc);
 657 }