lustre/lov/lov_ea.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lov/lov_ea.c
  33  *
  34  * Author: Wang Di <wangdi@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LOV
  38
  39 #include <linux/math64.h>
  40 #include <linux/sort.h>
  41 #include <libcfs/libcfs.h>
  42
  43 #include <obd_class.h>
  44 #include "lov_internal.h"
  45
  46 static inline void
  47 lu_extent_le_to_cpu(struct lu_extent *dst, const struct lu_extent *src)
  48 {
  49         dst->e_start = le64_to_cpu(src->e_start);
  50         dst->e_end = le64_to_cpu(src->e_end);
  51 }
  52
  53 /* Find minimum stripe maxbytes value.  For inactive or
  54  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES. */
  55 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
  56 {
  57         struct obd_import *imp;
  58         loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
  59
  60         if (!tgt->ltd_active)
  61                 return maxbytes;
  62
  63         imp = tgt->ltd_obd->u.cli.cl_import;
  64         if (imp == NULL)
  65                 return maxbytes;
  66
  67         spin_lock(&imp->imp_lock);
  68         if (imp->imp_state == LUSTRE_IMP_FULL &&
  69             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
  70             imp->imp_connect_data.ocd_maxbytes > 0)
  71                 maxbytes = imp->imp_connect_data.ocd_maxbytes;
  72
  73         spin_unlock(&imp->imp_lock);
  74
  75         return maxbytes;
  76 }
  77
  78 static int lsm_lmm_verify_v1v3(struct lov_mds_md *lmm, size_t lmm_size,
  79                                u16 stripe_count)
  80 {
  81         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  82                 CERROR("bad stripe count %d\n", stripe_count);
  83                 lov_dump_lmm_common(D_WARNING, lmm);
  84                 return -EINVAL;
  85         }
  86
  87         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  88                 CERROR("zero object id\n");
  89                 lov_dump_lmm_common(D_WARNING, lmm);
  90                 return -EINVAL;
  91         }
  92
  93         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  94                 CERROR("bad striping pattern\n");
  95                 lov_dump_lmm_common(D_WARNING, lmm);
  96                 return -EINVAL;
  97         }
  98
  99         if (lmm->lmm_stripe_size == 0 ||
 100             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
 101                 CERROR("bad stripe size %u\n",
 102                        le32_to_cpu(lmm->lmm_stripe_size));
 103                 lov_dump_lmm_common(D_WARNING, lmm);
 104                 return -EINVAL;
 105         }
 106         return 0;
 107 }
 108
 109 static void lsme_free(struct lov_stripe_md_entry *lsme)
 110 {
 111         unsigned int stripe_count = lsme->lsme_stripe_count;
 112         unsigned int i;
 113         size_t lsme_size;
 114
 115         if (!lsme_inited(lsme) ||
 116             lsme->lsme_pattern & LOV_PATTERN_F_RELEASED)
 117                 stripe_count = 0;
 118         for (i = 0; i < stripe_count; i++)
 119                 OBD_SLAB_FREE_PTR(lsme->lsme_oinfo[i], lov_oinfo_slab);
 120
 121         lsme_size = offsetof(typeof(*lsme), lsme_oinfo[stripe_count]);
 122         OBD_FREE_LARGE(lsme, lsme_size);
 123 }
 124
 125 void lsm_free(struct lov_stripe_md *lsm)
 126 {
 127         unsigned int entry_count = lsm->lsm_entry_count;
 128         unsigned int i;
 129         size_t lsm_size;
 130
 131         for (i = 0; i < entry_count; i++)
 132                 lsme_free(lsm->lsm_entries[i]);
 133
 134         lsm_size = offsetof(typeof(*lsm), lsm_entries[entry_count]);
 135         OBD_FREE(lsm, lsm_size);
 136 }
 137
 138 /**
 139  * Unpack a struct lov_mds_md into a struct lov_stripe_md_entry.
 140  *
 141  * The caller should set id and extent.
 142  */
 143 static struct lov_stripe_md_entry *
 144 lsme_unpack(struct lov_obd *lov, struct lov_mds_md *lmm, size_t buf_size,
 145             const char *pool_name, bool inited, struct lov_ost_data_v1 *objects,
 146             loff_t *maxbytes)
 147 {
 148         struct lov_stripe_md_entry *lsme;
 149         size_t lsme_size;
 150         loff_t min_stripe_maxbytes = 0;
 151         loff_t lov_bytes;
 152         u32 magic;
 153         u32 pattern;
 154         unsigned int stripe_count;
 155         unsigned int i;
 156         int rc;
 157
 158         magic = le32_to_cpu(lmm->lmm_magic);
 159         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 160                 RETURN(ERR_PTR(-EINVAL));
 161
 162         pattern = le32_to_cpu(lmm->lmm_pattern);
 163         if (pattern & LOV_PATTERN_F_RELEASED || !inited)
 164                 stripe_count = 0;
 165         else
 166                 stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 167
 168         if (buf_size < (magic == LOV_MAGIC_V1 ? sizeof(struct lov_mds_md_v1) :
 169                                                 sizeof(struct lov_mds_md_v3))) {
 170                 CERROR("LOV EA %s too small: %zu, need %u\n",
 171                        magic == LOV_MAGIC_V1 ? "V1" : "V3", buf_size,
 172                        lov_mds_md_size(stripe_count, magic == LOV_MAGIC_V1 ?
 173                                        LOV_MAGIC_V1 : LOV_MAGIC_V3));
 174                 lov_dump_lmm_common(D_WARNING, lmm);
 175                 return ERR_PTR(-EINVAL);
 176         }
 177
 178         rc = lsm_lmm_verify_v1v3(lmm, buf_size, stripe_count);
 179         if (rc < 0)
 180                 return ERR_PTR(rc);
 181
 182         lsme_size = offsetof(typeof(*lsme), lsme_oinfo[stripe_count]);
 183         OBD_ALLOC_LARGE(lsme, lsme_size);
 184         if (lsme == NULL)
 185                 RETURN(ERR_PTR(-ENOMEM));
 186
 187         lsme->lsme_magic = magic;
 188         lsme->lsme_pattern = pattern;
 189         lsme->lsme_flags = 0;
 190         lsme->lsme_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 191         /* preserve the possible -1 stripe count for uninstantiated component */
 192         lsme->lsme_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 193         lsme->lsme_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 194
 195         if (pool_name != NULL) {
 196                 size_t pool_name_len;
 197
 198                 pool_name_len = strlcpy(lsme->lsme_pool_name, pool_name,
 199                                         sizeof(lsme->lsme_pool_name));
 200                 if (pool_name_len >= sizeof(lsme->lsme_pool_name))
 201                         GOTO(out_lsme, rc = -E2BIG);
 202         }
 203
 204         for (i = 0; i < stripe_count; i++) {
 205                 struct lov_oinfo *loi;
 206                 struct lov_tgt_desc *ltd;
 207
 208                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 209                 if (loi == NULL)
 210                         GOTO(out_lsme, rc = -ENOMEM);
 211
 212                 lsme->lsme_oinfo[i] = loi;
 213
 214                 ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 215                 loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 216                 loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 217                 if (lov_oinfo_is_dummy(loi))
 218                         continue;
 219
 220                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
 221                     !lov2obd(lov)->obd_process_conf) {
 222                         CERROR("%s: OST index %d more than OST count %d\n",
 223                                (char*)lov->desc.ld_uuid.uuid,
 224                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 225                         lov_dump_lmm_v1(D_WARNING, lmm);
 226                         GOTO(out_lsme, rc = -EINVAL);
 227                 }
 228
 229                 ltd = lov->lov_tgts[loi->loi_ost_idx];
 230                 if (ltd == NULL) {
 231                         CERROR("%s: OST index %d missing\n",
 232                                (char*)lov->desc.ld_uuid.uuid, loi->loi_ost_idx);
 233                         lov_dump_lmm_v1(D_WARNING, lmm);
 234                         continue;
 235                 }
 236
 237                 lov_bytes = lov_tgt_maxbytes(ltd);
 238                 if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
 239                         min_stripe_maxbytes = lov_bytes;
 240         }
 241
 242         if (min_stripe_maxbytes == 0)
 243                 min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 244
 245         lov_bytes = min_stripe_maxbytes * stripe_count;
 246
 247         if (maxbytes != NULL) {
 248                 if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
 249                         *maxbytes = MAX_LFS_FILESIZE;
 250                 else
 251                         *maxbytes = lov_bytes;
 252         }
 253
 254         return lsme;
 255
 256 out_lsme:
 257         for (i = 0; i < stripe_count; i++) {
 258                 struct lov_oinfo *loi = lsme->lsme_oinfo[i];
 259
 260                 if (loi != NULL)
 261                         OBD_SLAB_FREE_PTR(lsme->lsme_oinfo[i], lov_oinfo_slab);
 262         }
 263         OBD_FREE_LARGE(lsme, lsme_size);
 264
 265         return ERR_PTR(rc);
 266 }
 267
 268 static struct
 269 lov_stripe_md *lsm_unpackmd_v1v3(struct lov_obd *lov, struct lov_mds_md *lmm,
 270                                  size_t buf_size, const char *pool_name,
 271                                  struct lov_ost_data_v1 *objects)
 272 {
 273         struct lov_stripe_md *lsm;
 274         struct lov_stripe_md_entry *lsme;
 275         size_t lsm_size;
 276         loff_t maxbytes;
 277         u32 pattern;
 278         int rc;
 279
 280         pattern = le32_to_cpu(lmm->lmm_pattern);
 281
 282         lsme = lsme_unpack(lov, lmm, buf_size, pool_name, true, objects,
 283                            &maxbytes);
 284         if (IS_ERR(lsme))
 285                 RETURN(ERR_CAST(lsme));
 286
 287         lsme->lsme_flags = LCME_FL_INIT;
 288         lsme->lsme_extent.e_start = 0;
 289         lsme->lsme_extent.e_end = LUSTRE_EOF;
 290
 291         lsm_size = offsetof(typeof(*lsm), lsm_entries[1]);
 292         OBD_ALLOC(lsm, lsm_size);
 293         if (lsm == NULL)
 294                 GOTO(out_lsme, rc = -ENOMEM);
 295
 296         atomic_set(&lsm->lsm_refc, 1);
 297         spin_lock_init(&lsm->lsm_lock);
 298         lsm->lsm_maxbytes = maxbytes;
 299         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 300         lsm->lsm_magic = le32_to_cpu(lmm->lmm_magic);
 301         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 302         lsm->lsm_entry_count = 1;
 303         lsm->lsm_is_released = pattern & LOV_PATTERN_F_RELEASED;
 304         lsm->lsm_entries[0] = lsme;
 305
 306         return lsm;
 307
 308 out_lsme:
 309         lsme_free(lsme);
 310
 311         return ERR_PTR(rc);
 312 }
 313
 314 static inline struct lov_stripe_md *
 315 lsm_unpackmd_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 316 {
 317         struct lov_mds_md_v1 *lmm = buf;
 318
 319         return lsm_unpackmd_v1v3(lov, buf, buf_size, NULL, lmm->lmm_objects);
 320 }
 321
 322 const struct lsm_operations lsm_v1_ops = {
 323         .lsm_unpackmd           = lsm_unpackmd_v1,
 324 };
 325
 326 static inline
 327 struct lov_stripe_md *lsm_unpackmd_v3(struct lov_obd *lov, void *buf,
 328                                       size_t buf_size)
 329 {
 330         struct lov_mds_md_v3 *lmm = buf;
 331
 332         return lsm_unpackmd_v1v3(lov, buf, buf_size, lmm->lmm_pool_name,
 333                                  lmm->lmm_objects);
 334 }
 335
 336 const struct lsm_operations lsm_v3_ops = {
 337         .lsm_unpackmd           = lsm_unpackmd_v3,
 338 };
 339
 340 static int lsm_verify_comp_md_v1(struct lov_comp_md_v1 *lcm,
 341                                  size_t lcm_buf_size)
 342 {
 343         unsigned int entry_count;
 344         unsigned int i;
 345         size_t lcm_size;
 346
 347         lcm_size = le32_to_cpu(lcm->lcm_size);
 348         if (lcm_buf_size < lcm_size) {
 349                 CERROR("bad LCM buffer size %zu, expected %zu\n",
 350                        lcm_buf_size, lcm_size);
 351                 RETURN(-EINVAL);
 352         }
 353
 354         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 355         for (i = 0; i < entry_count; i++) {
 356                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 357                 size_t blob_offset;
 358                 size_t blob_size;
 359
 360                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 361                 blob_size = le32_to_cpu(lcme->lcme_size);
 362
 363                 if (lcm_size < blob_offset || lcm_size < blob_size ||
 364                     lcm_size < blob_offset + blob_size) {
 365                         CERROR("LCM entry %u has invalid blob: "
 366                                "LCM size = %zu, offset = %zu, size = %zu\n",
 367                                le32_to_cpu(lcme->lcme_id),
 368                                lcm_size, blob_offset, blob_size);
 369                         RETURN(-EINVAL);
 370                 }
 371         }
 372
 373         return 0;
 374 }
 375
 376 static struct lov_stripe_md_entry *
 377 lsme_unpack_comp(struct lov_obd *lov, struct lov_mds_md *lmm,
 378                  size_t lmm_buf_size, bool inited, loff_t *maxbytes)
 379 {
 380         unsigned int magic;
 381         unsigned int stripe_count;
 382
 383         stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 384         if (stripe_count == 0)
 385                 RETURN(ERR_PTR(-EINVAL));
 386         /* un-instantiated lmm contains no ost id info, i.e. lov_ost_data_v1 */
 387         if (!inited)
 388                 stripe_count = 0;
 389
 390         magic = le32_to_cpu(lmm->lmm_magic);
 391         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 392                 RETURN(ERR_PTR(-EINVAL));
 393
 394         if (lmm_buf_size < lov_mds_md_size(stripe_count, magic))
 395                 RETURN(ERR_PTR(-EINVAL));
 396
 397         if (magic == LOV_MAGIC_V1) {
 398                 return lsme_unpack(lov, lmm, lmm_buf_size, NULL,
 399                                    inited, lmm->lmm_objects, maxbytes);
 400         } else {
 401                 struct lov_mds_md_v3 *lmm3 = (struct lov_mds_md_v3 *)lmm;
 402
 403                 return lsme_unpack(lov, lmm, lmm_buf_size, lmm3->lmm_pool_name,
 404                                    inited, lmm3->lmm_objects, maxbytes);
 405         }
 406 }
 407
 408 static struct lov_stripe_md *
 409 lsm_unpackmd_comp_md_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 410 {
 411         struct lov_comp_md_v1 *lcm = buf;
 412         struct lov_stripe_md *lsm;
 413         size_t lsm_size;
 414         unsigned int entry_count = 0;
 415         unsigned int i;
 416         loff_t maxbytes;
 417         int rc;
 418
 419         rc = lsm_verify_comp_md_v1(buf, buf_size);
 420         if (rc < 0)
 421                 return ERR_PTR(rc);
 422
 423         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 424
 425         lsm_size = offsetof(typeof(*lsm), lsm_entries[entry_count]);
 426         OBD_ALLOC(lsm, lsm_size);
 427         if (lsm == NULL)
 428                 return ERR_PTR(-ENOMEM);
 429
 430         atomic_set(&lsm->lsm_refc, 1);
 431         spin_lock_init(&lsm->lsm_lock);
 432         lsm->lsm_magic = le32_to_cpu(lcm->lcm_magic);
 433         lsm->lsm_layout_gen = le32_to_cpu(lcm->lcm_layout_gen);
 434         lsm->lsm_entry_count = entry_count;
 435         lsm->lsm_is_released = true;
 436         lsm->lsm_maxbytes = LLONG_MIN;
 437
 438         for (i = 0; i < entry_count; i++) {
 439                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 440                 struct lov_stripe_md_entry *lsme;
 441                 size_t blob_offset;
 442                 size_t blob_size;
 443                 void *blob;
 444
 445                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 446                 blob_size = le32_to_cpu(lcme->lcme_size);
 447                 blob = (char *)lcm + blob_offset;
 448
 449                 lsme = lsme_unpack_comp(lov, blob, blob_size,
 450                                         le32_to_cpu(lcme->lcme_flags) &
 451                                         LCME_FL_INIT,
 452                                         (i == entry_count - 1) ? &maxbytes :
 453                                                                  NULL);
 454                 if (IS_ERR(lsme))
 455                         GOTO(out_lsm, rc = PTR_ERR(lsme));
 456
 457                 if (!(lsme->lsme_pattern & LOV_PATTERN_F_RELEASED))
 458                         lsm->lsm_is_released = false;
 459
 460                 lsm->lsm_entries[i] = lsme;
 461                 lsme->lsme_id = le32_to_cpu(lcme->lcme_id);
 462                 lsme->lsme_flags = le32_to_cpu(lcme->lcme_flags);
 463                 lu_extent_le_to_cpu(&lsme->lsme_extent, &lcme->lcme_extent);
 464
 465                 if (i == entry_count - 1) {
 466                         lsm->lsm_maxbytes = (loff_t)lsme->lsme_extent.e_start +
 467                                             maxbytes;
 468                         /* the last component hasn't been defined, or
 469                          * lsm_maxbytes overflowed. */
 470                         if (lsme->lsme_extent.e_end != LUSTRE_EOF ||
 471                             lsm->lsm_maxbytes <
 472                             (loff_t)lsme->lsme_extent.e_start)
 473                                 lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
 474                 }
 475         }
 476
 477         RETURN(lsm);
 478
 479 out_lsm:
 480         for (i = 0; i < entry_count; i++)
 481                 if (lsm->lsm_entries[i] != NULL)
 482                         lsme_free(lsm->lsm_entries[i]);
 483
 484         OBD_FREE(lsm, lsm_size);
 485
 486         RETURN(ERR_PTR(rc));
 487 }
 488
 489 const struct lsm_operations lsm_comp_md_v1_ops = {
 490         .lsm_unpackmd         = lsm_unpackmd_comp_md_v1,
 491 };
 492
 493 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 494 {
 495         int i, j;
 496
 497         CDEBUG(level, "lsm %p, objid "DOSTID", maxbytes %#llx, magic 0x%08X, "
 498                "refc: %d, entry: %u, layout_gen %u\n",
 499                lsm, POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 500                atomic_read(&lsm->lsm_refc), lsm->lsm_entry_count,
 501                lsm->lsm_layout_gen);
 502
 503         for (i = 0; i < lsm->lsm_entry_count; i++) {
 504                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 505
 506                 CDEBUG(level, DEXT ": id: %u, flags: %x, "
 507                        "magic 0x%08X, layout_gen %u, "
 508                        "stripe count %u, sstripe size %u, "
 509                        "pool: ["LOV_POOLNAMEF"]\n",
 510                        PEXT(&lse->lsme_extent), lse->lsme_id, lse->lsme_flags,
 511                        lse->lsme_magic, lse->lsme_layout_gen,
 512                        lse->lsme_stripe_count, lse->lsme_stripe_size,
 513                        lse->lsme_pool_name);
 514                 if (!lsme_inited(lse) ||
 515                     lse->lsme_pattern & LOV_PATTERN_F_RELEASED)
 516                         continue;
 517                 for (j = 0; j < lse->lsme_stripe_count; j++) {
 518                         CDEBUG(level, "   oinfo:%p: ostid: "DOSTID
 519                                " ost idx: %d gen: %d\n",
 520                                lse->lsme_oinfo[j],
 521                                POSTID(&lse->lsme_oinfo[j]->loi_oi),
 522                                lse->lsme_oinfo[j]->loi_ost_idx,
 523                                lse->lsme_oinfo[j]->loi_ost_gen);
 524                 }
 525         }
 526 }
 527
 528 int lov_lsm_entry(const struct lov_stripe_md *lsm, __u64 offset)
 529 {
 530         int i;
 531
 532         for (i = 0; i < lsm->lsm_entry_count; i++) {
 533                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 534
 535                 if ((offset >= lse->lsme_extent.e_start &&
 536                      offset < lse->lsme_extent.e_end) ||
 537                     (offset == OBD_OBJECT_EOF &&
 538                      lse->lsme_extent.e_end == OBD_OBJECT_EOF))
 539                         return i;
 540         }
 541
 542         return -1;
 543 }