lustre/lov/lov_pack.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  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_common(int level, void *lmmp)
  58 {
  59         struct lov_mds_md *lmm = lmmp;
  60         struct ost_id   oi;
  61
  62         lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
  63         CDEBUG(level, "objid "DOSTID", magic 0x%08x, pattern %#x\n",
  64                POSTID(&oi), le32_to_cpu(lmm->lmm_magic),
  65                le32_to_cpu(lmm->lmm_pattern));
  66         CDEBUG(level, "stripe_size %u, stripe_count %u, layout_gen %u\n",
  67                le32_to_cpu(lmm->lmm_stripe_size),
  68                le16_to_cpu(lmm->lmm_stripe_count),
  69                le16_to_cpu(lmm->lmm_layout_gen));
  70 }
  71
  72 static void lov_dump_lmm_objects(int level, struct lov_ost_data *lod,
  73                                  int stripe_count)
  74 {
  75         int i;
  76
  77         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  78                 CDEBUG(level, "bad stripe_count %u > max_stripe_count %u\n",
  79                        stripe_count, LOV_V1_INSANE_STRIPE_COUNT);
  80                 return;
  81         }
  82
  83         for (i = 0; i < stripe_count; ++i, ++lod) {
  84                 struct ost_id   oi;
  85
  86                 ostid_le_to_cpu(&lod->l_ost_oi, &oi);
  87                 CDEBUG(level, "stripe %u idx %u subobj "DOSTID"\n", i,
  88                        le32_to_cpu(lod->l_ost_idx), POSTID(&oi));
  89         }
  90 }
  91
  92 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  93 {
  94         lov_dump_lmm_common(level, lmm);
  95         lov_dump_lmm_objects(level, lmm->lmm_objects,
  96                              le16_to_cpu(lmm->lmm_stripe_count));
  97 }
  98
  99 void lov_dump_lmm_v3(int level, struct lov_mds_md_v3 *lmm)
 100 {
 101         lov_dump_lmm_common(level, lmm);
 102         CDEBUG(level,"pool_name "LOV_POOLNAMEF"\n", lmm->lmm_pool_name);
 103         lov_dump_lmm_objects(level, lmm->lmm_objects,
 104                              le16_to_cpu(lmm->lmm_stripe_count));
 105 }
 106
 107 void lov_dump_lmm(int level, void *lmm)
 108 {
 109         int magic;
 110
 111         magic = ((struct lov_mds_md_v1 *)(lmm))->lmm_magic;
 112         switch (magic) {
 113         case LOV_MAGIC_V1:
 114                 return lov_dump_lmm_v1(level, (struct lov_mds_md_v1 *)(lmm));
 115         case LOV_MAGIC_V3:
 116                 return lov_dump_lmm_v3(level, (struct lov_mds_md_v3 *)(lmm));
 117         default:
 118                 CERROR("Cannot recognize lmm_magic %x", magic);
 119         }
 120         return;
 121 }
 122
 123 #define LMM_ASSERT(test)                                                \
 124 do {                                                                    \
 125         if (!(test)) lov_dump_lmm(D_ERROR, lmm);                        \
 126         LASSERT(test); /* so we know what assertion failed */           \
 127 } while(0)
 128
 129 /* Pack LOV object metadata for disk storage.  It is packed in LE byte
 130  * order and is opaque to the networking layer.
 131  *
 132  * XXX In the future, this will be enhanced to get the EA size from the
 133  *     underlying OSC device(s) to get their EA sizes so we can stack
 134  *     LOVs properly.  For now lov_mds_md_size() just assumes one obd_id
 135  *     per stripe.
 136  */
 137 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
 138                struct lov_stripe_md *lsm)
 139 {
 140         struct obd_device *obd = class_exp2obd(exp);
 141         struct lov_obd *lov = &obd->u.lov;
 142         struct lov_mds_md_v1 *lmmv1;
 143         struct lov_mds_md_v3 *lmmv3;
 144         __u16 stripe_count;
 145         struct lov_ost_data_v1 *lmm_objects;
 146         int lmm_size, lmm_magic;
 147         int i;
 148         int cplen = 0;
 149         ENTRY;
 150
 151         if (lsm) {
 152                 lmm_magic = lsm->lsm_magic;
 153         } else {
 154                 if (lmmp && *lmmp)
 155                         lmm_magic = le32_to_cpu((*lmmp)->lmm_magic);
 156                 else
 157                         /* lsm == NULL and lmmp == NULL */
 158                         lmm_magic = LOV_MAGIC;
 159         }
 160
 161         if ((lmm_magic != LOV_MAGIC_V1) &&
 162             (lmm_magic != LOV_MAGIC_V3)) {
 163                 CERROR("bad mem LOV MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
 164                         lmm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
 165                 RETURN(-EINVAL);
 166
 167         }
 168
 169         if (lsm) {
 170                 /* If we are just sizing the EA, limit the stripe count
 171                  * to the actual number of OSTs in this filesystem. */
 172                 if (!lmmp) {
 173                         stripe_count = lov_get_stripecnt(lov, lmm_magic,
 174                                                         lsm->lsm_stripe_count);
 175                         lsm->lsm_stripe_count = stripe_count;
 176                 } else if (!lsm_is_released(lsm)) {
 177                         stripe_count = lsm->lsm_stripe_count;
 178                 } else {
 179                         stripe_count = 0;
 180                 }
 181         } else {
 182                 /* No need to allocate more than maximum supported stripes.
 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 = lov_mds_md_stripecnt(lov->lov_ocd.ocd_max_easize,
 187                                                     lmm_magic);
 188                 if (stripe_count > lov->desc.ld_tgt_count)
 189                         stripe_count = lov->desc.ld_tgt_count;
 190         }
 191
 192         /* XXX LOV STACKING call into osc for sizes */
 193         lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
 194
 195         if (!lmmp)
 196                 RETURN(lmm_size);
 197
 198         if (*lmmp && !lsm) {
 199                 stripe_count = le16_to_cpu((*lmmp)->lmm_stripe_count);
 200                 lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
 201                 OBD_FREE_LARGE(*lmmp, lmm_size);
 202                 *lmmp = NULL;
 203                 RETURN(0);
 204         }
 205
 206         if (!*lmmp) {
 207                 OBD_ALLOC_LARGE(*lmmp, lmm_size);
 208                 if (!*lmmp)
 209                         RETURN(-ENOMEM);
 210         }
 211
 212         CDEBUG(D_INFO, "lov_packmd: LOV_MAGIC 0x%08X, lmm_size = %d \n",
 213                lmm_magic, lmm_size);
 214
 215         lmmv1 = *lmmp;
 216         lmmv3 = (struct lov_mds_md_v3 *)*lmmp;
 217         if (lmm_magic == LOV_MAGIC_V3)
 218                 lmmv3->lmm_magic = cpu_to_le32(LOV_MAGIC_V3);
 219         else
 220                 lmmv1->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
 221
 222         if (!lsm)
 223                 RETURN(lmm_size);
 224
 225         /* lmmv1 and lmmv3 point to the same struct and have the
 226          * same first fields
 227          */
 228         lmm_oi_cpu_to_le(&lmmv1->lmm_oi, &lsm->lsm_oi);
 229         lmmv1->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
 230         lmmv1->lmm_stripe_count = cpu_to_le16(stripe_count);
 231         lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
 232         lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
 233         if (lsm->lsm_magic == LOV_MAGIC_V3) {
 234                 cplen = strlcpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name,
 235                                 sizeof(lmmv3->lmm_pool_name));
 236                 if (cplen >= sizeof(lmmv3->lmm_pool_name))
 237                         RETURN(-E2BIG);
 238                 lmm_objects = lmmv3->lmm_objects;
 239         } else {
 240                 lmm_objects = lmmv1->lmm_objects;
 241         }
 242
 243         for (i = 0; i < stripe_count; i++) {
 244                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
 245                 /* XXX LOV STACKING call down to osc_packmd() to do packing */
 246                 LASSERTF(ostid_id(&loi->loi_oi) != 0, "lmm_oi "DOSTID
 247                          " stripe %u/%u idx %u\n", POSTID(&lmmv1->lmm_oi),
 248                          i, stripe_count, loi->loi_ost_idx);
 249                 ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
 250                 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 251                 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 252         }
 253
 254         RETURN(lmm_size);
 255 }
 256
 257 /* Find the max stripecount we should use */
 258 __u16 lov_get_stripecnt(struct lov_obd *lov, __u32 magic, __u16 stripe_count)
 259 {
 260         __u32 max_stripes = LOV_MAX_STRIPE_COUNT_OLD;
 261
 262         if (!stripe_count)
 263                 stripe_count = lov->desc.ld_default_stripe_count;
 264         if (stripe_count > lov->desc.ld_active_tgt_count)
 265                 stripe_count = lov->desc.ld_active_tgt_count;
 266         if (!stripe_count)
 267                 stripe_count = 1;
 268
 269         /* stripe count is based on whether ldiskfs can handle
 270          * larger EA sizes */
 271         if (lov->lov_ocd.ocd_connect_flags & OBD_CONNECT_MAX_EASIZE &&
 272             lov->lov_ocd.ocd_max_easize)
 273                 max_stripes = lov_mds_md_stripecnt(lov->lov_ocd.ocd_max_easize,
 274                                                    magic);
 275
 276         if (stripe_count > max_stripes)
 277                 stripe_count = max_stripes;
 278
 279         return stripe_count;
 280 }
 281
 282
 283 static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count)
 284 {
 285         int rc;
 286
 287         if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) {
 288                 char *buffer;
 289                 int sz;
 290
 291                 CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n",
 292                        le32_to_cpu(*(__u32 *)lmm), lmm_bytes);
 293                 sz = lmm_bytes * 2 + 1;
 294                 OBD_ALLOC_LARGE(buffer, sz);
 295                 if (buffer != NULL) {
 296                         int i;
 297
 298                         for (i = 0; i < lmm_bytes; i++)
 299                                 sprintf(buffer+2*i, "%.2X", ((char *)lmm)[i]);
 300                         buffer[sz - 1] = '\0';
 301                         CERROR("%s\n", buffer);
 302                         OBD_FREE_LARGE(buffer, sz);
 303                 }
 304                 return -EINVAL;
 305         }
 306         rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm,
 307                                      lmm_bytes, stripe_count);
 308         return rc;
 309 }
 310
 311 int lov_alloc_memmd(struct lov_stripe_md **lsmp, __u16 stripe_count,
 312                     int pattern, int magic)
 313 {
 314         int i, lsm_size;
 315         ENTRY;
 316
 317         CDEBUG(D_INFO, "alloc lsm, stripe_count %d\n", stripe_count);
 318
 319         *lsmp = lsm_alloc_plain(stripe_count, &lsm_size);
 320         if (!*lsmp) {
 321                 CERROR("can't allocate lsmp stripe_count %d\n", stripe_count);
 322                 RETURN(-ENOMEM);
 323         }
 324
 325         cfs_atomic_set(&(*lsmp)->lsm_refc, 1);
 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_layout_gen = 0;
 333         if (stripe_count > 0)
 334                 (*lsmp)->lsm_oinfo[0]->loi_ost_idx = ~0;
 335
 336         for (i = 0; i < stripe_count; i++)
 337                 loi_init((*lsmp)->lsm_oinfo[i]);
 338
 339         RETURN(lsm_size);
 340 }
 341
 342 int lov_free_memmd(struct lov_stripe_md **lsmp)
 343 {
 344         struct lov_stripe_md *lsm = *lsmp;
 345         int refc;
 346
 347         *lsmp = NULL;
 348         LASSERT(cfs_atomic_read(&lsm->lsm_refc) > 0);
 349         if ((refc = cfs_atomic_dec_return(&lsm->lsm_refc)) == 0) {
 350                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
 351                 lsm_op_find(lsm->lsm_magic)->lsm_free(lsm);
 352         }
 353         return refc;
 354 }
 355
 356
 357 /* Unpack LOV object metadata from disk storage.  It is packed in LE byte
 358  * order and is opaque to the networking layer.
 359  */
 360 int lov_unpackmd(struct obd_export *exp,  struct lov_stripe_md **lsmp,
 361                  struct lov_mds_md *lmm, int lmm_bytes)
 362 {
 363         struct obd_device *obd = class_exp2obd(exp);
 364         struct lov_obd *lov = &obd->u.lov;
 365         int rc = 0, lsm_size;
 366         __u16 stripe_count;
 367         __u32 magic;
 368         __u32 pattern;
 369         ENTRY;
 370
 371         /* If passed an MDS struct use values from there, otherwise defaults */
 372         if (lmm) {
 373                 rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
 374                 if (rc)
 375                         RETURN(rc);
 376                 magic = le32_to_cpu(lmm->lmm_magic);
 377         } else {
 378                 magic = LOV_MAGIC;
 379                 stripe_count = lov_get_stripecnt(lov, magic, 0);
 380         }
 381
 382         /* If we aren't passed an lsmp struct, we just want the size */
 383         if (!lsmp) {
 384                 /* XXX LOV STACKING call into osc for sizes */
 385                 LBUG();
 386                 RETURN(lov_stripe_md_size(stripe_count));
 387         }
 388         /* If we are passed an allocated struct but nothing to unpack, free */
 389         if (*lsmp && !lmm) {
 390                 lov_free_memmd(lsmp);
 391                 RETURN(0);
 392         }
 393
 394         pattern = le32_to_cpu(lmm->lmm_pattern);
 395         lsm_size = lov_alloc_memmd(lsmp, stripe_count, pattern, magic);
 396         if (lsm_size < 0)
 397                 RETURN(lsm_size);
 398
 399         /* If we are passed a pointer but nothing to unpack, we only alloc */
 400         if (!lmm)
 401                 RETURN(lsm_size);
 402
 403         LASSERT(lsm_op_find(magic) != NULL);
 404         rc = lsm_op_find(magic)->lsm_unpackmd(lov, *lsmp, lmm);
 405         if (rc) {
 406                 lov_free_memmd(lsmp);
 407                 RETURN(rc);
 408         }
 409
 410         RETURN(lsm_size);
 411 }
 412
 413 static int __lov_setstripe(struct obd_export *exp, int max_lmm_size,
 414                            struct lov_stripe_md **lsmp,
 415                            struct lov_user_md *lump)
 416 {
 417         struct obd_device *obd = class_exp2obd(exp);
 418         struct lov_obd *lov = &obd->u.lov;
 419         char buffer[sizeof(struct lov_user_md_v3)];
 420         struct lov_user_md_v3 *lumv3 = (struct lov_user_md_v3 *)&buffer[0];
 421         struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&buffer[0];
 422         int lmm_magic;
 423         __u16 stripe_count;
 424         int rc;
 425         int cplen = 0;
 426         ENTRY;
 427
 428         rc = lov_lum_swab_if_needed(lumv3, &lmm_magic, lump);
 429         if (rc)
 430                 RETURN(rc);
 431
 432         /* in the rest of the tests, as *lumv1 and lumv3 have the same
 433          * fields, we use lumv1 to avoid code duplication */
 434
 435         if (lumv1->lmm_pattern == 0) {
 436                 lumv1->lmm_pattern = lov->desc.ld_pattern ?
 437                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 438         }
 439
 440         if (lov_pattern(lumv1->lmm_pattern) != LOV_PATTERN_RAID0) {
 441                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 442                        lumv1->lmm_pattern);
 443                 RETURN(-EINVAL);
 444         }
 445
 446         /* 64kB is the largest common page size we see (ia64), and matches the
 447          * check in lfs */
 448         if (lumv1->lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
 449                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n",
 450                        lumv1->lmm_stripe_size, LOV_MIN_STRIPE_SIZE);
 451                 lumv1->lmm_stripe_size = LOV_MIN_STRIPE_SIZE;
 452         }
 453
 454         if ((lumv1->lmm_stripe_offset >= lov->desc.ld_tgt_count) &&
 455             (lumv1->lmm_stripe_offset !=
 456              (typeof(lumv1->lmm_stripe_offset))(-1))) {
 457                 CDEBUG(D_IOCTL, "stripe offset %u > number of OSTs %u\n",
 458                        lumv1->lmm_stripe_offset, lov->desc.ld_tgt_count);
 459                 RETURN(-EINVAL);
 460         }
 461         stripe_count = lov_get_stripecnt(lov, lmm_magic,
 462                                          lumv1->lmm_stripe_count);
 463
 464         if (max_lmm_size) {
 465                 int max_stripes = (max_lmm_size -
 466                                    lov_mds_md_size(0, lmm_magic)) /
 467                                    sizeof(struct lov_ost_data_v1);
 468                 if (unlikely(max_stripes < stripe_count)) {
 469                         CDEBUG(D_IOCTL, "stripe count reset from %d to %d\n",
 470                                stripe_count, max_stripes);
 471                         stripe_count = max_stripes;
 472                 }
 473         }
 474
 475         if (lmm_magic == LOV_USER_MAGIC_V3) {
 476                 struct pool_desc *pool;
 477
 478                 /* In the function below, .hs_keycmp resolves to
 479                  * pool_hashkey_keycmp() */
 480                 /* coverity[overrun-buffer-val] */
 481                 pool = lov_find_pool(lov, lumv3->lmm_pool_name);
 482                 if (pool != NULL) {
 483                         if (lumv3->lmm_stripe_offset !=
 484                             (typeof(lumv3->lmm_stripe_offset))(-1)) {
 485                                 rc = lov_check_index_in_pool(
 486                                         lumv3->lmm_stripe_offset, pool);
 487                                 if (rc < 0) {
 488                                         lov_pool_putref(pool);
 489                                         RETURN(-EINVAL);
 490                                 }
 491                         }
 492
 493                         if (stripe_count > pool_tgt_count(pool))
 494                                 stripe_count = pool_tgt_count(pool);
 495
 496                         lov_pool_putref(pool);
 497                 }
 498         }
 499
 500         if (lumv1->lmm_pattern & LOV_PATTERN_F_RELEASED)
 501                 stripe_count = 0;
 502
 503         rc = lov_alloc_memmd(lsmp, stripe_count, lumv1->lmm_pattern, lmm_magic);
 504
 505         if (rc >= 0) {
 506                 (*lsmp)->lsm_oinfo[0]->loi_ost_idx = lumv1->lmm_stripe_offset;
 507                 (*lsmp)->lsm_stripe_size = lumv1->lmm_stripe_size;
 508                 if (lmm_magic == LOV_USER_MAGIC_V3) {
 509                         cplen = strlcpy((*lsmp)->lsm_pool_name,
 510                                         lumv3->lmm_pool_name,
 511                                         sizeof((*lsmp)->lsm_pool_name));
 512                         if (cplen >= sizeof((*lsmp)->lsm_pool_name))
 513                                 rc = -E2BIG;
 514                 }
 515                 rc = 0;
 516         }
 517
 518         RETURN(rc);
 519 }
 520
 521 /* Configure object striping information on a new file.
 522  *
 523  * @lmmu is a pointer to a user struct with one or more of the fields set to
 524  * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 525  * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 526  * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 527  */
 528 int lov_setstripe(struct obd_export *exp, int max_lmm_size,
 529                   struct lov_stripe_md **lsmp, struct lov_user_md *lump)
 530 {
 531         int rc;
 532         mm_segment_t seg;
 533
 534         seg = get_fs();
 535         set_fs(KERNEL_DS);
 536
 537         rc = __lov_setstripe(exp, max_lmm_size, lsmp, lump);
 538         set_fs(seg);
 539         RETURN(rc);
 540 }
 541
 542 int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
 543               struct lov_user_md *lump)
 544 {
 545         int i;
 546         int rc;
 547         struct obd_export *oexp;
 548         struct lov_obd *lov = &exp->exp_obd->u.lov;
 549         obd_id last_id = 0;
 550         struct lov_user_ost_data_v1 *lmm_objects;
 551
 552         ENTRY;
 553
 554         if (lump->lmm_magic == LOV_USER_MAGIC_V3)
 555                 lmm_objects = ((struct lov_user_md_v3 *)lump)->lmm_objects;
 556         else
 557                 lmm_objects = lump->lmm_objects;
 558
 559         for (i = 0; i < lump->lmm_stripe_count; i++) {
 560                 __u32 len = sizeof(last_id);
 561                 oexp = lov->lov_tgts[lmm_objects[i].l_ost_idx]->ltd_exp;
 562                 rc = obd_get_info(NULL, oexp, sizeof(KEY_LAST_ID), KEY_LAST_ID,
 563                                   &len, &last_id, NULL);
 564                 if (rc)
 565                         RETURN(rc);
 566                 if (ostid_id(&lmm_objects[i].l_ost_oi) > last_id) {
 567                         CERROR("Setting EA for object > than last id on"
 568                                " ost idx %d "DOSTID" > "LPD64" \n",
 569                                lmm_objects[i].l_ost_idx,
 570                                POSTID(&lmm_objects[i].l_ost_oi), last_id);
 571                         RETURN(-EINVAL);
 572                 }
 573         }
 574
 575         rc = lov_setstripe(exp, 0, lsmp, lump);
 576         if (rc)
 577                 RETURN(rc);
 578
 579         for (i = 0; i < lump->lmm_stripe_count; i++) {
 580                 (*lsmp)->lsm_oinfo[i]->loi_ost_idx =
 581                         lmm_objects[i].l_ost_idx;
 582                 (*lsmp)->lsm_oinfo[i]->loi_oi = lmm_objects[i].l_ost_oi;
 583         }
 584         RETURN(0);
 585 }
 586
 587
 588 /* Retrieve object striping information.
 589  *
 590  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 591  * the maximum number of OST indices which will fit in the user buffer.
 592  * lmm_magic must be LOV_USER_MAGIC.
 593  */
 594 int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
 595                   struct lov_user_md *lump)
 596 {
 597         /*
 598          * XXX huge struct allocated on stack.
 599          */
 600         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
 601         struct lov_user_md_v3 lum;
 602         struct lov_mds_md *lmmk = NULL;
 603         int rc, lmm_size;
 604         int lum_size;
 605         ENTRY;
 606
 607         if (!lsm)
 608                 RETURN(-ENODATA);
 609
 610         /* we only need the header part from user space to get lmm_magic and
 611          * lmm_stripe_count, (the header part is common to v1 and v3) */
 612         lum_size = sizeof(struct lov_user_md_v1);
 613         if (copy_from_user(&lum, lump, lum_size))
 614                 GOTO(out_set, rc = -EFAULT);
 615         else if ((lum.lmm_magic != LOV_USER_MAGIC) &&
 616                  (lum.lmm_magic != LOV_USER_MAGIC_V3))
 617                 GOTO(out_set, rc = -EINVAL);
 618
 619         if (lum.lmm_stripe_count &&
 620             (lum.lmm_stripe_count < lsm->lsm_stripe_count)) {
 621                 /* Return right size of stripe to user */
 622                 lum.lmm_stripe_count = lsm->lsm_stripe_count;
 623                 rc = copy_to_user(lump, &lum, lum_size);
 624                 GOTO(out_set, rc = -EOVERFLOW);
 625         }
 626         rc = lov_packmd(exp, &lmmk, lsm);
 627         if (rc < 0)
 628                 GOTO(out_set, rc);
 629         lmm_size = rc;
 630         rc = 0;
 631
 632         /* FIXME: Bug 1185 - copy fields properly when structs change */
 633         /* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */
 634         CLASSERT(sizeof(lum) == sizeof(struct lov_mds_md_v3));
 635         CLASSERT(sizeof lum.lmm_objects[0] == sizeof lmmk->lmm_objects[0]);
 636
 637         if ((cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) &&
 638             ((lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1)) ||
 639             (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)))) {
 640                 lustre_swab_lov_mds_md(lmmk);
 641                 lustre_swab_lov_user_md_objects(
 642                                 (struct lov_user_ost_data*)lmmk->lmm_objects,
 643                                 lmmk->lmm_stripe_count);
 644         }
 645         if (lum.lmm_magic == LOV_USER_MAGIC) {
 646                 /* User request for v1, we need skip lmm_pool_name */
 647                 if (lmmk->lmm_magic == LOV_MAGIC_V3) {
 648                         memmove((char*)(&lmmk->lmm_stripe_count) +
 649                                 sizeof(lmmk->lmm_stripe_count),
 650                                 ((struct lov_mds_md_v3*)lmmk)->lmm_objects,
 651                                 lmmk->lmm_stripe_count *
 652                                 sizeof(struct lov_ost_data_v1));
 653                         lmm_size -= LOV_MAXPOOLNAME;
 654                 }
 655         } else {
 656                 /* if v3 we just have to update the lum_size */
 657                 lum_size = sizeof(struct lov_user_md_v3);
 658         }
 659
 660         /* User wasn't expecting this many OST entries */
 661         if (lum.lmm_stripe_count == 0)
 662                 lmm_size = lum_size;
 663         else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count)
 664                 GOTO(out_set, rc = -EOVERFLOW);
 665         /*
 666          * Have a difference between lov_mds_md & lov_user_md.
 667          * So we have to re-order the data before copy to user.
 668          */
 669         lum.lmm_stripe_count = lmmk->lmm_stripe_count;
 670         lum.lmm_layout_gen = lmmk->lmm_layout_gen;
 671         ((struct lov_user_md *)lmmk)->lmm_layout_gen = lum.lmm_layout_gen;
 672         ((struct lov_user_md *)lmmk)->lmm_stripe_count = lum.lmm_stripe_count;
 673         if (copy_to_user(lump, lmmk, lmm_size))
 674                 rc = -EFAULT;
 675
 676         obd_free_diskmd(exp, &lmmk);
 677 out_set:
 678         RETURN(rc);
 679 }