drivers/staging/lustre/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, 2012, 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
  45 #include <lustre_net.h>
  46 #include <obd.h>
  47 #include <obd_lov.h>
  48 #include <obd_class.h>
  49 #include <obd_support.h>
  50 #include <lustre/lustre_user.h>
  51
  52 #include "lov_internal.h"
  53
  54 void lov_dump_lmm_common(int level, void *lmmp)
  55 {
  56         struct lov_mds_md *lmm = lmmp;
  57         struct ost_id   oi;
  58
  59         lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
  60         CDEBUG(level, "objid "DOSTID", magic 0x%08x, pattern %#x\n",
  61                POSTID(&oi), le32_to_cpu(lmm->lmm_magic),
  62                le32_to_cpu(lmm->lmm_pattern));
  63         CDEBUG(level, "stripe_size %u, stripe_count %u, layout_gen %u\n",
  64                le32_to_cpu(lmm->lmm_stripe_size),
  65                le16_to_cpu(lmm->lmm_stripe_count),
  66                le16_to_cpu(lmm->lmm_layout_gen));
  67 }
  68
  69 static void lov_dump_lmm_objects(int level, struct lov_ost_data *lod,
  70                                  int stripe_count)
  71 {
  72         int i;
  73
  74         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  75                 CDEBUG(level, "bad stripe_count %u > max_stripe_count %u\n",
  76                        stripe_count, LOV_V1_INSANE_STRIPE_COUNT);
  77                 return;
  78         }
  79
  80         for (i = 0; i < stripe_count; ++i, ++lod) {
  81                 struct ost_id   oi;
  82
  83                 ostid_le_to_cpu(&lod->l_ost_oi, &oi);
  84                 CDEBUG(level, "stripe %u idx %u subobj "DOSTID"\n", i,
  85                        le32_to_cpu(lod->l_ost_idx), POSTID(&oi));
  86         }
  87 }
  88
  89 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  90 {
  91         lov_dump_lmm_common(level, lmm);
  92         lov_dump_lmm_objects(level, lmm->lmm_objects,
  93                              le16_to_cpu(lmm->lmm_stripe_count));
  94 }
  95
  96 void lov_dump_lmm_v3(int level, struct lov_mds_md_v3 *lmm)
  97 {
  98         lov_dump_lmm_common(level, lmm);
  99         CDEBUG(level,"pool_name "LOV_POOLNAMEF"\n", lmm->lmm_pool_name);
 100         lov_dump_lmm_objects(level, lmm->lmm_objects,
 101                              le16_to_cpu(lmm->lmm_stripe_count));
 102 }
 103
 104 void lov_dump_lmm(int level, void *lmm)
 105 {
 106         int magic;
 107
 108         magic = ((struct lov_mds_md_v1 *)(lmm))->lmm_magic;
 109         switch (magic) {
 110         case LOV_MAGIC_V1:
 111                 return lov_dump_lmm_v1(level, (struct lov_mds_md_v1 *)(lmm));
 112         case LOV_MAGIC_V3:
 113                 return lov_dump_lmm_v3(level, (struct lov_mds_md_v3 *)(lmm));
 114         default:
 115                 CERROR("Cannot recognize lmm_magic %x", magic);
 116         }
 117         return;
 118 }
 119
 120 #define LMM_ASSERT(test)                                                \
 121 do {                                                                \
 122         if (!(test)) lov_dump_lmm(D_ERROR, lmm);                        \
 123         LASSERT(test); /* so we know what assertion failed */      \
 124 } while(0)
 125
 126 /* Pack LOV object metadata for disk storage.  It is packed in LE byte
 127  * order and is opaque to the networking layer.
 128  *
 129  * XXX In the future, this will be enhanced to get the EA size from the
 130  *     underlying OSC device(s) to get their EA sizes so we can stack
 131  *     LOVs properly.  For now lov_mds_md_size() just assumes one obd_id
 132  *     per stripe.
 133  */
 134 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
 135                struct lov_stripe_md *lsm)
 136 {
 137         struct obd_device *obd = class_exp2obd(exp);
 138         struct lov_obd *lov = &obd->u.lov;
 139         struct lov_mds_md_v1 *lmmv1;
 140         struct lov_mds_md_v3 *lmmv3;
 141         __u16 stripe_count;
 142         struct lov_ost_data_v1 *lmm_objects;
 143         int lmm_size, lmm_magic;
 144         int i;
 145         int cplen = 0;
 146         ENTRY;
 147
 148         if (lsm) {
 149                 lmm_magic = lsm->lsm_magic;
 150         } else {
 151                 if (lmmp && *lmmp)
 152                         lmm_magic = le32_to_cpu((*lmmp)->lmm_magic);
 153                 else
 154                         /* lsm == NULL and lmmp == NULL */
 155                         lmm_magic = LOV_MAGIC;
 156         }
 157
 158         if ((lmm_magic != LOV_MAGIC_V1) &&
 159             (lmm_magic != LOV_MAGIC_V3)) {
 160                 CERROR("bad mem LOV MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
 161                         lmm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
 162                 RETURN(-EINVAL);
 163
 164         }
 165
 166         if (lsm) {
 167                 /* If we are just sizing the EA, limit the stripe count
 168                  * to the actual number of OSTs in this filesystem. */
 169                 if (!lmmp) {
 170                         stripe_count = lov_get_stripecnt(lov, lmm_magic,
 171                                                          lsm->lsm_stripe_count);
 172                         lsm->lsm_stripe_count = stripe_count;
 173                 } else {
 174                         stripe_count = lsm->lsm_stripe_count;
 175                 }
 176         } else {
 177                 /* No need to allocate more than maximum supported stripes.
 178                  * Anyway, this is pretty inaccurate since ld_tgt_count now
 179                  * represents max index and we should rely on the actual number
 180                  * of OSTs instead */
 181                 stripe_count = lov_mds_md_stripecnt(lov->lov_ocd.ocd_max_easize,
 182                                                     lmm_magic);
 183                 if (stripe_count > lov->desc.ld_tgt_count)
 184                         stripe_count = lov->desc.ld_tgt_count;
 185         }
 186
 187         /* XXX LOV STACKING call into osc for sizes */
 188         lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
 189
 190         if (!lmmp)
 191                 RETURN(lmm_size);
 192
 193         if (*lmmp && !lsm) {
 194                 stripe_count = le16_to_cpu((*lmmp)->lmm_stripe_count);
 195                 lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
 196                 OBD_FREE_LARGE(*lmmp, lmm_size);
 197                 *lmmp = NULL;
 198                 RETURN(0);
 199         }
 200
 201         if (!*lmmp) {
 202                 OBD_ALLOC_LARGE(*lmmp, lmm_size);
 203                 if (!*lmmp)
 204                         RETURN(-ENOMEM);
 205         }
 206
 207         CDEBUG(D_INFO, "lov_packmd: LOV_MAGIC 0x%08X, lmm_size = %d \n",
 208                lmm_magic, lmm_size);
 209
 210         lmmv1 = *lmmp;
 211         lmmv3 = (struct lov_mds_md_v3 *)*lmmp;
 212         if (lmm_magic == LOV_MAGIC_V3)
 213                 lmmv3->lmm_magic = cpu_to_le32(LOV_MAGIC_V3);
 214         else
 215                 lmmv1->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
 216
 217         if (!lsm)
 218                 RETURN(lmm_size);
 219
 220         /* lmmv1 and lmmv3 point to the same struct and have the
 221          * same first fields
 222          */
 223         lmm_oi_cpu_to_le(&lmmv1->lmm_oi, &lsm->lsm_oi);
 224         lmmv1->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
 225         lmmv1->lmm_stripe_count = cpu_to_le16(stripe_count);
 226         lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
 227         lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
 228         if (lsm->lsm_magic == LOV_MAGIC_V3) {
 229                 cplen = strlcpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name,
 230                                 sizeof(lmmv3->lmm_pool_name));
 231                 if (cplen >= sizeof(lmmv3->lmm_pool_name))
 232                         RETURN(-E2BIG);
 233                 lmm_objects = lmmv3->lmm_objects;
 234         } else {
 235                 lmm_objects = lmmv1->lmm_objects;
 236         }
 237
 238         for (i = 0; i < stripe_count; i++) {
 239                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
 240                 /* XXX LOV STACKING call down to osc_packmd() to do packing */
 241                 LASSERTF(ostid_id(&loi->loi_oi) != 0, "lmm_oi "DOSTID
 242                          " stripe %u/%u idx %u\n", POSTID(&lmmv1->lmm_oi),
 243                          i, stripe_count, loi->loi_ost_idx);
 244                 ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
 245                 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 246                 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 247         }
 248
 249         RETURN(lmm_size);
 250 }
 251
 252 /* Find the max stripecount we should use */
 253 __u16 lov_get_stripecnt(struct lov_obd *lov, __u32 magic, __u16 stripe_count)
 254 {
 255         __u32 max_stripes = LOV_MAX_STRIPE_COUNT_OLD;
 256
 257         if (!stripe_count)
 258                 stripe_count = lov->desc.ld_default_stripe_count;
 259         if (stripe_count > lov->desc.ld_active_tgt_count)
 260                 stripe_count = lov->desc.ld_active_tgt_count;
 261         if (!stripe_count)
 262                 stripe_count = 1;
 263
 264         /* stripe count is based on whether ldiskfs can handle
 265          * larger EA sizes */
 266         if (lov->lov_ocd.ocd_connect_flags & OBD_CONNECT_MAX_EASIZE &&
 267             lov->lov_ocd.ocd_max_easize)
 268                 max_stripes = lov_mds_md_stripecnt(lov->lov_ocd.ocd_max_easize,
 269                                                    magic);
 270
 271         if (stripe_count > max_stripes)
 272                 stripe_count = max_stripes;
 273
 274         return stripe_count;
 275 }
 276
 277
 278 static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count)
 279 {
 280         int rc;
 281
 282         if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) {
 283                 char *buffer;
 284                 int sz;
 285
 286                 CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n",
 287                        le32_to_cpu(*(__u32 *)lmm), lmm_bytes);
 288                 sz = lmm_bytes * 2 + 1;
 289                 OBD_ALLOC_LARGE(buffer, sz);
 290                 if (buffer != NULL) {
 291                         int i;
 292
 293                         for (i = 0; i < lmm_bytes; i++)
 294                                 sprintf(buffer+2*i, "%.2X", ((char *)lmm)[i]);
 295                         buffer[sz - 1] = '\0';
 296                         CERROR("%s\n", buffer);
 297                         OBD_FREE_LARGE(buffer, sz);
 298                 }
 299                 return -EINVAL;
 300         }
 301         rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm,
 302                                      lmm_bytes, stripe_count);
 303         return rc;
 304 }
 305
 306 int lov_alloc_memmd(struct lov_stripe_md **lsmp, __u16 stripe_count,
 307                     int pattern, int magic)
 308 {
 309         int i, lsm_size;
 310         ENTRY;
 311
 312         CDEBUG(D_INFO, "alloc lsm, stripe_count %d\n", stripe_count);
 313
 314         *lsmp = lsm_alloc_plain(stripe_count, &lsm_size);
 315         if (!*lsmp) {
 316                 CERROR("can't allocate lsmp stripe_count %d\n", stripe_count);
 317                 RETURN(-ENOMEM);
 318         }
 319
 320         atomic_set(&(*lsmp)->lsm_refc, 1);
 321         spin_lock_init(&(*lsmp)->lsm_lock);
 322         (*lsmp)->lsm_magic = magic;
 323         (*lsmp)->lsm_stripe_count = stripe_count;
 324         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES * stripe_count;
 325         (*lsmp)->lsm_pattern = pattern;
 326         (*lsmp)->lsm_pool_name[0] = '\0';
 327         (*lsmp)->lsm_layout_gen = 0;
 328         (*lsmp)->lsm_oinfo[0]->loi_ost_idx = ~0;
 329
 330         for (i = 0; i < stripe_count; i++)
 331                 loi_init((*lsmp)->lsm_oinfo[i]);
 332
 333         RETURN(lsm_size);
 334 }
 335
 336 int lov_free_memmd(struct lov_stripe_md **lsmp)
 337 {
 338         struct lov_stripe_md *lsm = *lsmp;
 339         int refc;
 340
 341         *lsmp = NULL;
 342         LASSERT(atomic_read(&lsm->lsm_refc) > 0);
 343         if ((refc = atomic_dec_return(&lsm->lsm_refc)) == 0) {
 344                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
 345                 lsm_op_find(lsm->lsm_magic)->lsm_free(lsm);
 346         }
 347         return refc;
 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, lsm_size;
 360         __u16 stripe_count;
 361         __u32 magic;
 362         ENTRY;
 363
 364         /* If passed an MDS struct use values from there, otherwise defaults */
 365         if (lmm) {
 366                 rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
 367                 if (rc)
 368                         RETURN(rc);
 369                 magic = le32_to_cpu(lmm->lmm_magic);
 370         } else {
 371                 magic = LOV_MAGIC;
 372                 stripe_count = lov_get_stripecnt(lov, magic, 0);
 373         }
 374
 375         /* If we aren't passed an lsmp struct, we just want the size */
 376         if (!lsmp) {
 377                 /* XXX LOV STACKING call into osc for sizes */
 378                 LBUG();
 379                 RETURN(lov_stripe_md_size(stripe_count));
 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 static int __lov_setstripe(struct obd_export *exp, int max_lmm_size,
 407                            struct lov_stripe_md **lsmp,
 408                            struct lov_user_md *lump)
 409 {
 410         struct obd_device *obd = class_exp2obd(exp);
 411         struct lov_obd *lov = &obd->u.lov;
 412         char buffer[sizeof(struct lov_user_md_v3)];
 413         struct lov_user_md_v3 *lumv3 = (struct lov_user_md_v3 *)&buffer[0];
 414         struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&buffer[0];
 415         int lmm_magic;
 416         __u16 stripe_count;
 417         int rc;
 418         int cplen = 0;
 419         ENTRY;
 420
 421         rc = lov_lum_swab_if_needed(lumv3, &lmm_magic, lump);
 422         if (rc)
 423                 RETURN(rc);
 424
 425         /* in the rest of the tests, as *lumv1 and lumv3 have the same
 426          * fields, we use lumv1 to avoid code duplication */
 427
 428         if (lumv1->lmm_pattern == 0) {
 429                 lumv1->lmm_pattern = lov->desc.ld_pattern ?
 430                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 431         }
 432
 433         if (lumv1->lmm_pattern != LOV_PATTERN_RAID0) {
 434                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 435                        lumv1->lmm_pattern);
 436                 RETURN(-EINVAL);
 437         }
 438
 439         /* 64kB is the largest common page size we see (ia64), and matches the
 440          * check in lfs */
 441         if (lumv1->lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
 442                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n",
 443                        lumv1->lmm_stripe_size, LOV_MIN_STRIPE_SIZE);
 444                 lumv1->lmm_stripe_size = LOV_MIN_STRIPE_SIZE;
 445         }
 446
 447         if ((lumv1->lmm_stripe_offset >= lov->desc.ld_tgt_count) &&
 448             (lumv1->lmm_stripe_offset !=
 449              (typeof(lumv1->lmm_stripe_offset))(-1))) {
 450                 CDEBUG(D_IOCTL, "stripe offset %u > number of OSTs %u\n",
 451                        lumv1->lmm_stripe_offset, lov->desc.ld_tgt_count);
 452                 RETURN(-EINVAL);
 453         }
 454         stripe_count = lov_get_stripecnt(lov, lmm_magic,
 455                                          lumv1->lmm_stripe_count);
 456
 457         if (max_lmm_size) {
 458                 int max_stripes = (max_lmm_size -
 459                                    lov_mds_md_size(0, lmm_magic)) /
 460                                    sizeof(struct lov_ost_data_v1);
 461                 if (unlikely(max_stripes < stripe_count)) {
 462                         CDEBUG(D_IOCTL, "stripe count reset from %d to %d\n",
 463                                stripe_count, max_stripes);
 464                         stripe_count = max_stripes;
 465                 }
 466         }
 467
 468         if (lmm_magic == LOV_USER_MAGIC_V3) {
 469                 struct pool_desc *pool;
 470
 471                 /* In the function below, .hs_keycmp resolves to
 472                  * pool_hashkey_keycmp() */
 473                 /* coverity[overrun-buffer-val] */
 474                 pool = lov_find_pool(lov, lumv3->lmm_pool_name);
 475                 if (pool != NULL) {
 476                         if (lumv3->lmm_stripe_offset !=
 477                             (typeof(lumv3->lmm_stripe_offset))(-1)) {
 478                                 rc = lov_check_index_in_pool(
 479                                         lumv3->lmm_stripe_offset, pool);
 480                                 if (rc < 0) {
 481                                         lov_pool_putref(pool);
 482                                         RETURN(-EINVAL);
 483                                 }
 484                         }
 485
 486                         if (stripe_count > pool_tgt_count(pool))
 487                                 stripe_count = pool_tgt_count(pool);
 488
 489                         lov_pool_putref(pool);
 490                 }
 491         }
 492
 493         rc = lov_alloc_memmd(lsmp, stripe_count, lumv1->lmm_pattern, lmm_magic);
 494
 495         if (rc >= 0) {
 496                 (*lsmp)->lsm_oinfo[0]->loi_ost_idx = lumv1->lmm_stripe_offset;
 497                 (*lsmp)->lsm_stripe_size = lumv1->lmm_stripe_size;
 498                 if (lmm_magic == LOV_USER_MAGIC_V3) {
 499                         cplen = strlcpy((*lsmp)->lsm_pool_name,
 500                                         lumv3->lmm_pool_name,
 501                                         sizeof((*lsmp)->lsm_pool_name));
 502                         if (cplen >= sizeof((*lsmp)->lsm_pool_name))
 503                                 rc = -E2BIG;
 504                 }
 505                 rc = 0;
 506         }
 507
 508         RETURN(rc);
 509 }
 510
 511 /* Configure object striping information on a new file.
 512  *
 513  * @lmmu is a pointer to a user struct with one or more of the fields set to
 514  * indicate the application preference: lmm_stripe_count, lmm_stripe_size,
 515  * lmm_stripe_offset, and lmm_stripe_pattern.  lmm_magic must be LOV_MAGIC.
 516  * @lsmp is a pointer to an in-core stripe MD that needs to be filled in.
 517  */
 518 int lov_setstripe(struct obd_export *exp, int max_lmm_size,
 519                   struct lov_stripe_md **lsmp, struct lov_user_md *lump)
 520 {
 521         int rc;
 522         mm_segment_t seg;
 523
 524         seg = get_fs();
 525         set_fs(KERNEL_DS);
 526
 527         rc = __lov_setstripe(exp, max_lmm_size, lsmp, lump);
 528         set_fs(seg);
 529         RETURN(rc);
 530 }
 531
 532 int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp,
 533               struct lov_user_md *lump)
 534 {
 535         int i;
 536         int rc;
 537         struct obd_export *oexp;
 538         struct lov_obd *lov = &exp->exp_obd->u.lov;
 539         obd_id last_id = 0;
 540         struct lov_user_ost_data_v1 *lmm_objects;
 541
 542         ENTRY;
 543
 544         if (lump->lmm_magic == LOV_USER_MAGIC_V3)
 545                 lmm_objects = ((struct lov_user_md_v3 *)lump)->lmm_objects;
 546         else
 547                 lmm_objects = lump->lmm_objects;
 548
 549         for (i = 0; i < lump->lmm_stripe_count; i++) {
 550                 __u32 len = sizeof(last_id);
 551                 oexp = lov->lov_tgts[lmm_objects[i].l_ost_idx]->ltd_exp;
 552                 rc = obd_get_info(NULL, oexp, sizeof(KEY_LAST_ID), KEY_LAST_ID,
 553                                   &len, &last_id, NULL);
 554                 if (rc)
 555                         RETURN(rc);
 556                 if (ostid_id(&lmm_objects[i].l_ost_oi) > last_id) {
 557                         CERROR("Setting EA for object > than last id on"
 558                                " ost idx %d "DOSTID" > "LPD64" \n",
 559                                lmm_objects[i].l_ost_idx,
 560                                POSTID(&lmm_objects[i].l_ost_oi), last_id);
 561                         RETURN(-EINVAL);
 562                 }
 563         }
 564
 565         rc = lov_setstripe(exp, 0, lsmp, lump);
 566         if (rc)
 567                 RETURN(rc);
 568
 569         for (i = 0; i < lump->lmm_stripe_count; i++) {
 570                 (*lsmp)->lsm_oinfo[i]->loi_ost_idx =
 571                         lmm_objects[i].l_ost_idx;
 572                 (*lsmp)->lsm_oinfo[i]->loi_oi = lmm_objects[i].l_ost_oi;
 573         }
 574         RETURN(0);
 575 }
 576
 577
 578 /* Retrieve object striping information.
 579  *
 580  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 581  * the maximum number of OST indices which will fit in the user buffer.
 582  * lmm_magic must be LOV_USER_MAGIC.
 583  */
 584 int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
 585                   struct lov_user_md *lump)
 586 {
 587         /*
 588          * XXX huge struct allocated on stack.
 589          */
 590         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
 591         struct lov_user_md_v3 lum;
 592         struct lov_mds_md *lmmk = NULL;
 593         int rc, lmm_size;
 594         int lum_size;
 595         mm_segment_t seg;
 596         ENTRY;
 597
 598         if (!lsm)
 599                 RETURN(-ENODATA);
 600
 601         /*
 602          * "Switch to kernel segment" to allow copying from kernel space by
 603          * copy_{to,from}_user().
 604          */
 605         seg = get_fs();
 606         set_fs(KERNEL_DS);
 607
 608         /* we only need the header part from user space to get lmm_magic and
 609          * lmm_stripe_count, (the header part is common to v1 and v3) */
 610         lum_size = sizeof(struct lov_user_md_v1);
 611         if (copy_from_user(&lum, lump, lum_size))
 612                 GOTO(out_set, rc = -EFAULT);
 613         else if ((lum.lmm_magic != LOV_USER_MAGIC) &&
 614                  (lum.lmm_magic != LOV_USER_MAGIC_V3))
 615                 GOTO(out_set, rc = -EINVAL);
 616
 617         if (lum.lmm_stripe_count &&
 618             (lum.lmm_stripe_count < lsm->lsm_stripe_count)) {
 619                 /* Return right size of stripe to user */
 620                 lum.lmm_stripe_count = lsm->lsm_stripe_count;
 621                 rc = copy_to_user(lump, &lum, lum_size);
 622                 GOTO(out_set, rc = -EOVERFLOW);
 623         }
 624         rc = lov_packmd(exp, &lmmk, lsm);
 625         if (rc < 0)
 626                 GOTO(out_set, rc);
 627         lmm_size = rc;
 628         rc = 0;
 629
 630         /* FIXME: Bug 1185 - copy fields properly when structs change */
 631         /* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */
 632         CLASSERT(sizeof(lum) == sizeof(struct lov_mds_md_v3));
 633         CLASSERT(sizeof lum.lmm_objects[0] == sizeof lmmk->lmm_objects[0]);
 634
 635         if ((cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) &&
 636             ((lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1)) ||
 637             (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)))) {
 638                 lustre_swab_lov_mds_md(lmmk);
 639                 lustre_swab_lov_user_md_objects(
 640                                 (struct lov_user_ost_data*)lmmk->lmm_objects,
 641                                 lmmk->lmm_stripe_count);
 642         }
 643         if (lum.lmm_magic == LOV_USER_MAGIC) {
 644                 /* User request for v1, we need skip lmm_pool_name */
 645                 if (lmmk->lmm_magic == LOV_MAGIC_V3) {
 646                         memmove((char*)(&lmmk->lmm_stripe_count) +
 647                                 sizeof(lmmk->lmm_stripe_count),
 648                                 ((struct lov_mds_md_v3*)lmmk)->lmm_objects,
 649                                 lmmk->lmm_stripe_count *
 650                                 sizeof(struct lov_ost_data_v1));
 651                         lmm_size -= LOV_MAXPOOLNAME;
 652                 }
 653         } else {
 654                 /* if v3 we just have to update the lum_size */
 655                 lum_size = sizeof(struct lov_user_md_v3);
 656         }
 657
 658         /* User wasn't expecting this many OST entries */
 659         if (lum.lmm_stripe_count == 0)
 660                 lmm_size = lum_size;
 661         else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count)
 662                 GOTO(out_set, rc = -EOVERFLOW);
 663         /*
 664          * Have a difference between lov_mds_md & lov_user_md.
 665          * So we have to re-order the data before copy to user.
 666          */
 667         lum.lmm_stripe_count = lmmk->lmm_stripe_count;
 668         lum.lmm_layout_gen = lmmk->lmm_layout_gen;
 669         ((struct lov_user_md *)lmmk)->lmm_layout_gen = lum.lmm_layout_gen;
 670         ((struct lov_user_md *)lmmk)->lmm_stripe_count = lum.lmm_stripe_count;
 671         if (copy_to_user(lump, lmmk, lmm_size))
 672                 rc = -EFAULT;
 673
 674         obd_free_diskmd(exp, &lmmk);
 675 out_set:
 676         set_fs(seg);
 677         RETURN(rc);
 678 }