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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/lov/lov_pack.c
  32  *
  33  * (Un)packing of OST/MDS requests
  34  *
  35  * Author: Andreas Dilger <adilger@clusterfs.com>
  36  */
  37
  38 #define DEBUG_SUBSYSTEM S_LOV
  39
  40 #include <lustre_net.h>
  41 #include <lustre_swab.h>
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <obd_support.h>
  45
  46 #include "lov_cl_internal.h"
  47 #include "lov_internal.h"
  48
  49 void lov_dump_lmm_common(int level, void *lmmp)
  50 {
  51         struct lov_mds_md *lmm = lmmp;
  52         struct ost_id oi;
  53
  54         lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
  55         CDEBUG_LIMIT(level, "objid "DOSTID", magic 0x%08x, pattern %#x\n",
  56                      POSTID(&oi), le32_to_cpu(lmm->lmm_magic),
  57                      le32_to_cpu(lmm->lmm_pattern));
  58         CDEBUG_LIMIT(level, "stripe_size %u, stripe_count %u, layout_gen %u\n",
  59                      le32_to_cpu(lmm->lmm_stripe_size),
  60                      le16_to_cpu(lmm->lmm_stripe_count),
  61                      le16_to_cpu(lmm->lmm_layout_gen));
  62 }
  63
  64 static void lov_dump_lmm_objects(int level, struct lov_ost_data *lod,
  65                                  int stripe_count)
  66 {
  67         int i;
  68
  69         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  70                 CDEBUG_LIMIT(level,
  71                              "bad stripe_count %u > max_stripe_count %u\n",
  72                              stripe_count, LOV_V1_INSANE_STRIPE_COUNT);
  73                 return;
  74         }
  75
  76         for (i = 0; i < stripe_count; ++i, ++lod) {
  77                 struct ost_id oi;
  78
  79                 ostid_le_to_cpu(&lod->l_ost_oi, &oi);
  80                 CDEBUG_LIMIT(level, "stripe %u idx %u subobj "DOSTID"\n", i,
  81                              le32_to_cpu(lod->l_ost_idx), POSTID(&oi));
  82         }
  83 }
  84
  85 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
  86 {
  87         lov_dump_lmm_common(level, lmm);
  88         lov_dump_lmm_objects(level, lmm->lmm_objects,
  89                              le16_to_cpu(lmm->lmm_stripe_count));
  90 }
  91
  92 /**
  93  * Pack LOV striping metadata for disk storage format (in little
  94  * endian byte order).
  95  *
  96  * This follows the getxattr() conventions. If \a buf_size is zero
  97  * then return the size needed. If \a buf_size is too small then
  98  * return -ERANGE. Otherwise return the size of the result.
  99  */
 100 static ssize_t lov_lsm_pack_v1v3(const struct lov_stripe_md *lsm, void *buf,
 101                                  size_t buf_size)
 102 {
 103         struct lov_mds_md_v1 *lmmv1 = buf;
 104         struct lov_mds_md_v3 *lmmv3 = buf;
 105         struct lov_ost_data_v1 *lmm_objects;
 106         size_t lmm_size;
 107         unsigned int i;
 108
 109         ENTRY;
 110
 111         lmm_size = lov_mds_md_size(lsm->lsm_entries[0]->lsme_stripe_count,
 112                                    lsm->lsm_magic);
 113         if (buf_size == 0)
 114                 RETURN(lmm_size);
 115
 116         if (buf_size < lmm_size)
 117                 RETURN(-ERANGE);
 118
 119         /*
 120          * lmmv1 and lmmv3 point to the same struct and have the
 121          * same first fields
 122          */
 123         lmmv1->lmm_magic = cpu_to_le32(lsm->lsm_magic);
 124         lmm_oi_cpu_to_le(&lmmv1->lmm_oi, &lsm->lsm_oi);
 125         lmmv1->lmm_stripe_size = cpu_to_le32(
 126                                 lsm->lsm_entries[0]->lsme_stripe_size);
 127         lmmv1->lmm_stripe_count = cpu_to_le16(
 128                                 lsm->lsm_entries[0]->lsme_stripe_count);
 129         lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_entries[0]->lsme_pattern);
 130         lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
 131
 132         if (lsm->lsm_magic == LOV_MAGIC_V3) {
 133                 BUILD_BUG_ON(sizeof(lsm->lsm_entries[0]->lsme_pool_name) !=
 134                                     sizeof(lmmv3->lmm_pool_name));
 135                 strlcpy(lmmv3->lmm_pool_name,
 136                         lsm->lsm_entries[0]->lsme_pool_name,
 137                         sizeof(lmmv3->lmm_pool_name));
 138                 lmm_objects = lmmv3->lmm_objects;
 139         } else {
 140                 lmm_objects = lmmv1->lmm_objects;
 141         }
 142
 143         if (lsm->lsm_is_released)
 144                 RETURN(lmm_size);
 145
 146         for (i = 0; i < lsm->lsm_entries[0]->lsme_stripe_count; i++) {
 147                 struct lov_oinfo *loi = lsm->lsm_entries[0]->lsme_oinfo[i];
 148
 149                 ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
 150                 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
 151                 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
 152         }
 153
 154         RETURN(lmm_size);
 155 }
 156
 157 static ssize_t lov_lsm_pack_foreign(const struct lov_stripe_md *lsm, void *buf,
 158                                     size_t buf_size)
 159 {
 160         struct lov_foreign_md *lfm = buf;
 161         size_t lfm_size;
 162
 163         lfm_size = lsm->lsm_foreign_size;
 164
 165         if (buf_size == 0)
 166                 RETURN(lfm_size);
 167
 168         /* if buffer too small return ERANGE but copy the size the
 169          * caller has requested anyway. This may be useful to get
 170          * only the header without the need to alloc the full size
 171          */
 172         if (buf_size < lfm_size) {
 173                 memcpy(lfm, lsm_foreign(lsm), buf_size);
 174                 RETURN(-ERANGE);
 175         }
 176
 177         /* full foreign LOV is already avail in its cache
 178          * no need to translate format fields to little-endian
 179          */
 180         memcpy(lfm, lsm_foreign(lsm), lsm->lsm_foreign_size);
 181
 182         RETURN(lfm_size);
 183 }
 184
 185 ssize_t lov_lsm_pack(const struct lov_stripe_md *lsm, void *buf,
 186                      size_t buf_size)
 187 {
 188         struct lov_comp_md_v1 *lcmv1 = buf;
 189         struct lov_comp_md_entry_v1 *lcme;
 190         struct lov_ost_data_v1 *lmm_objects;
 191         size_t lmm_size;
 192         unsigned int entry;
 193         unsigned int offset;
 194         unsigned int size;
 195         unsigned int i;
 196
 197         ENTRY;
 198
 199         if (lsm->lsm_magic == LOV_MAGIC_V1 || lsm->lsm_magic == LOV_MAGIC_V3)
 200                 return lov_lsm_pack_v1v3(lsm, buf, buf_size);
 201
 202         if (lsm->lsm_magic == LOV_MAGIC_FOREIGN)
 203                 return lov_lsm_pack_foreign(lsm, buf, buf_size);
 204
 205         lmm_size = lov_comp_md_size(lsm);
 206         if (buf_size == 0)
 207                 RETURN(lmm_size);
 208
 209         if (buf_size < lmm_size)
 210                 RETURN(-ERANGE);
 211
 212         lcmv1->lcm_magic = cpu_to_le32(lsm->lsm_magic);
 213         lcmv1->lcm_size = cpu_to_le32(lmm_size);
 214         lcmv1->lcm_layout_gen = cpu_to_le32(lsm->lsm_layout_gen);
 215         lcmv1->lcm_flags = cpu_to_le16(lsm->lsm_flags);
 216         lcmv1->lcm_mirror_count = cpu_to_le16(lsm->lsm_mirror_count);
 217         lcmv1->lcm_entry_count = cpu_to_le16(lsm->lsm_entry_count);
 218
 219         offset = sizeof(*lcmv1) + sizeof(*lcme) * lsm->lsm_entry_count;
 220
 221         for (entry = 0; entry < lsm->lsm_entry_count; entry++) {
 222                 struct lov_stripe_md_entry *lsme;
 223                 struct lov_mds_md *lmm;
 224                 __u16 stripe_count;
 225
 226                 lsme = lsm->lsm_entries[entry];
 227                 lcme = &lcmv1->lcm_entries[entry];
 228
 229                 lcme->lcme_id = cpu_to_le32(lsme->lsme_id);
 230                 lcme->lcme_flags = cpu_to_le32(lsme->lsme_flags);
 231                 if (lsme->lsme_flags & LCME_FL_NOSYNC)
 232                         lcme->lcme_timestamp =
 233                                 cpu_to_le64(lsme->lsme_timestamp);
 234                 lcme->lcme_extent.e_start =
 235                         cpu_to_le64(lsme->lsme_extent.e_start);
 236                 lcme->lcme_extent.e_end =
 237                         cpu_to_le64(lsme->lsme_extent.e_end);
 238                 lcme->lcme_offset = cpu_to_le32(offset);
 239
 240                 lmm = (struct lov_mds_md *)((char *)lcmv1 + offset);
 241                 lmm->lmm_magic = cpu_to_le32(lsme->lsme_magic);
 242                 /* lmm->lmm_oi not set */
 243                 lmm->lmm_pattern = cpu_to_le32(lsme->lsme_pattern);
 244                 lmm->lmm_stripe_size = cpu_to_le32(lsme->lsme_stripe_size);
 245                 lmm->lmm_stripe_count = cpu_to_le16(lsme->lsme_stripe_count);
 246                 lmm->lmm_layout_gen = cpu_to_le16(lsme->lsme_layout_gen);
 247
 248                 if (lsme->lsme_magic == LOV_MAGIC_V3) {
 249                         struct lov_mds_md_v3 *lmmv3 =
 250                                                 (struct lov_mds_md_v3 *)lmm;
 251
 252                         strlcpy(lmmv3->lmm_pool_name, lsme->lsme_pool_name,
 253                                 sizeof(lmmv3->lmm_pool_name));
 254                         lmm_objects = lmmv3->lmm_objects;
 255                 } else {
 256                         lmm_objects =
 257                                 ((struct lov_mds_md_v1 *)lmm)->lmm_objects;
 258                 }
 259
 260                 if (lsme_inited(lsme) &&
 261                     !(lsme->lsme_pattern & LOV_PATTERN_F_RELEASED))
 262                         stripe_count = lsme->lsme_stripe_count;
 263                 else
 264                         stripe_count = 0;
 265
 266                 for (i = 0; i < stripe_count; i++) {
 267                         struct lov_oinfo *loi = lsme->lsme_oinfo[i];
 268
 269                         ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
 270                         lmm_objects[i].l_ost_gen =
 271                                         cpu_to_le32(loi->loi_ost_gen);
 272                         lmm_objects[i].l_ost_idx =
 273                                         cpu_to_le32(loi->loi_ost_idx);
 274                 }
 275
 276                 size = lov_mds_md_size(stripe_count, lsme->lsme_magic);
 277                 lcme->lcme_size = cpu_to_le32(size);
 278                 offset += size;
 279         } /* for each layout component */
 280
 281         RETURN(lmm_size);
 282 }
 283
 284 /* Find the max stripecount we should use */
 285 __u16 lov_get_stripe_count(struct lov_obd *lov, __u32 magic, __u16 stripe_count)
 286 {
 287         __u32 max_stripes = LOV_MAX_STRIPE_COUNT_OLD;
 288
 289         if (!stripe_count)
 290                 stripe_count = lov->desc.ld_default_stripe_count;
 291         if (stripe_count > lov->desc.ld_active_tgt_count)
 292                 stripe_count = lov->desc.ld_active_tgt_count;
 293         if (!stripe_count)
 294                 stripe_count = 1;
 295
 296         /*
 297          * stripe count is based on whether ldiskfs can handle
 298          * larger EA sizes
 299          */
 300         if (lov->lov_ocd.ocd_connect_flags & OBD_CONNECT_MAX_EASIZE &&
 301             lov->lov_ocd.ocd_max_easize)
 302                 max_stripes = lov_mds_md_max_stripe_count(
 303                         lov->lov_ocd.ocd_max_easize, magic);
 304
 305         if (stripe_count > max_stripes)
 306                 stripe_count = max_stripes;
 307
 308         return stripe_count;
 309 }
 310
 311 int lov_free_memmd(struct lov_stripe_md **lsmp)
 312 {
 313         struct lov_stripe_md *lsm = *lsmp;
 314         int refc;
 315
 316         *lsmp = NULL;
 317         refc = atomic_dec_return(&lsm->lsm_refc);
 318         LASSERT(refc >= 0);
 319         if (refc == 0)
 320                 lsm_free(lsm);
 321
 322         return refc;
 323 }
 324
 325 /*
 326  * Unpack LOV object metadata from disk storage.  It is packed in LE byte
 327  * order and is opaque to the networking layer.
 328  */
 329 struct lov_stripe_md *lov_unpackmd(struct lov_obd *lov, void *buf,
 330                                    size_t buf_size)
 331 {
 332         const struct lsm_operations *op;
 333         struct lov_stripe_md *lsm;
 334         u32 magic;
 335
 336         ENTRY;
 337
 338         if (buf_size < sizeof(magic))
 339                 RETURN(ERR_PTR(-EINVAL));
 340
 341         magic = le32_to_cpu(*(u32 *)buf);
 342         op = lsm_op_find(magic);
 343         if (!op)
 344                 RETURN(ERR_PTR(-EINVAL));
 345
 346         lsm = op->lsm_unpackmd(lov, buf, buf_size);
 347
 348         RETURN(lsm);
 349 }
 350
 351 /*
 352  * Retrieve object striping information.
 353  *
 354  * @lump is a pointer to an in-core struct with lmm_ost_count indicating
 355  * the maximum number of OST indices which will fit in the user buffer.
 356  * lmm_magic must be LOV_USER_MAGIC.
 357  *
 358  * If @size > 0, User specified limited buffer size, usually the buffer is from
 359  * ll_lov_setstripe(), and the buffer can only hold basic layout template info.
 360  */
 361 int lov_getstripe(const struct lu_env *env, struct lov_object *obj,
 362                   struct lov_stripe_md *lsm, struct lov_user_md __user *lump,
 363                   size_t size)
 364 {
 365         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
 366         struct lov_mds_md *lmmk, *lmm;
 367         struct lov_foreign_md *lfm;
 368         struct lov_user_md_v1 lum;
 369         size_t lmmk_size, lum_size = 0;
 370         ssize_t lmm_size;
 371         int rc = 0;
 372
 373         ENTRY;
 374
 375         if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3 &&
 376             lsm->lsm_magic != LOV_MAGIC_COMP_V1 &&
 377             lsm->lsm_magic != LOV_MAGIC_FOREIGN) {
 378                 CERROR("bad LSM MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
 379                        lsm->lsm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
 380                 GOTO(out, rc = -EIO);
 381         }
 382
 383         lmmk_size = lov_comp_md_size(lsm);
 384
 385         OBD_ALLOC_LARGE(lmmk, lmmk_size);
 386         if (!lmmk)
 387                 GOTO(out, rc = -ENOMEM);
 388
 389         lmm_size = lov_lsm_pack(lsm, lmmk, lmmk_size);
 390         if (lmm_size < 0)
 391                 GOTO(out_free, rc = lmm_size);
 392
 393         if (cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) {
 394                 if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1) ||
 395                     lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
 396                         lustre_swab_lov_mds_md(lmmk);
 397                         lustre_swab_lov_user_md_objects(
 398                                 (struct lov_user_ost_data *)lmmk->lmm_objects,
 399                                 lmmk->lmm_stripe_count);
 400                 } else if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_COMP_V1)) {
 401                         lustre_swab_lov_comp_md_v1(
 402                                         (struct lov_comp_md_v1 *)lmmk);
 403                 } else if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_FOREIGN)) {
 404                         lfm = (struct lov_foreign_md *)lmmk;
 405                         __swab32s(&lfm->lfm_magic);
 406                         __swab32s(&lfm->lfm_length);
 407                         __swab32s(&lfm->lfm_type);
 408                         __swab32s(&lfm->lfm_flags);
 409                 }
 410         }
 411
 412         /*
 413          * Legacy appication passes limited buffer, we need to figure out
 414          * the user buffer size by the passed in lmm_stripe_count.
 415          */
 416         if (lsm->lsm_magic != LOV_MAGIC_FOREIGN)
 417                 if (copy_from_user(&lum, lump, sizeof(struct lov_user_md_v1)))
 418                         GOTO(out_free, rc = -EFAULT);
 419
 420         if (lum.lmm_magic == LOV_USER_MAGIC_V1 ||
 421             lum.lmm_magic == LOV_USER_MAGIC_V3)
 422                 lum_size = lov_user_md_size(lum.lmm_stripe_count,
 423                                             lum.lmm_magic);
 424
 425         if (lum_size != 0) {
 426                 struct lov_mds_md *comp_md = lmmk;
 427
 428                 /*
 429                  * Legacy app (ADIO for instance) treats the layout as V1/V3
 430                  * blindly, we'd return a reasonable V1/V3 for them.
 431                  */
 432                 if (lmmk->lmm_magic == LOV_MAGIC_COMP_V1) {
 433                         struct lov_comp_md_v1 *comp_v1;
 434                         struct cl_object *cl_obj;
 435                         struct cl_attr attr;
 436                         int i;
 437
 438                         attr.cat_size = 0;
 439                         cl_obj = cl_object_top(&obj->lo_cl);
 440                         cl_object_attr_lock(cl_obj);
 441                         cl_object_attr_get(env, cl_obj, &attr);
 442                         cl_object_attr_unlock(cl_obj);
 443
 444                         /*
 445                          * return the last instantiated component if file size
 446                          * is non-zero, otherwise, return the last component.
 447                          */
 448                         comp_v1 = (struct lov_comp_md_v1 *)lmmk;
 449                         i = attr.cat_size == 0 ? comp_v1->lcm_entry_count : 0;
 450                         for (; i < comp_v1->lcm_entry_count; i++) {
 451                                 if (!(comp_v1->lcm_entries[i].lcme_flags &
 452                                                 LCME_FL_INIT))
 453                                         break;
 454                         }
 455                         if (i > 0)
 456                                 i--;
 457                         comp_md = (struct lov_mds_md *)((char *)comp_v1 +
 458                                         comp_v1->lcm_entries[i].lcme_offset);
 459                         lum_size = comp_v1->lcm_entries[i].lcme_size;
 460                 }
 461
 462                 lmm = comp_md;
 463                 lmm_size = min(lum_size, lmmk_size);
 464         } else {
 465                 lmm = lmmk;
 466                 lmm_size = lmmk_size;
 467         }
 468
 469         /**
 470          * User specified limited buffer size, usually the buffer is
 471          * from ll_lov_setstripe(), and the buffer can only hold basic
 472          * layout template info.
 473          */
 474         if (size == 0 || size > lmm_size)
 475                 size = lmm_size;
 476         if (copy_to_user(lump, lmm, size))
 477                 GOTO(out_free, rc = -EFAULT);
 478
 479 out_free:
 480         OBD_FREE_LARGE(lmmk, lmmk_size);
 481 out:
 482         RETURN(rc);
 483 }