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 <lustre/lustre_idl.h>
  45 #include <lustre/lustre_user.h>
  46
  47 #include "lov_internal.h"
  48
  49 static inline void
  50 lu_extent_le_to_cpu(struct lu_extent *dst, const struct lu_extent *src)
  51 {
  52         dst->e_start = le64_to_cpu(src->e_start);
  53         dst->e_end = le64_to_cpu(src->e_end);
  54 }
  55
  56 /* Find minimum stripe maxbytes value.  For inactive or
  57  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES. */
  58 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
  59 {
  60         struct obd_import *imp;
  61         loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
  62
  63         if (!tgt->ltd_active)
  64                 return maxbytes;
  65
  66         imp = tgt->ltd_obd->u.cli.cl_import;
  67         if (imp == NULL)
  68                 return maxbytes;
  69
  70         spin_lock(&imp->imp_lock);
  71         if (imp->imp_state == LUSTRE_IMP_FULL &&
  72             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
  73             imp->imp_connect_data.ocd_maxbytes > 0)
  74                 maxbytes = imp->imp_connect_data.ocd_maxbytes;
  75
  76         spin_unlock(&imp->imp_lock);
  77
  78         return maxbytes;
  79 }
  80
  81 static int lsm_lmm_verify_v1v3(struct lov_mds_md *lmm, size_t lmm_size,
  82                                u16 stripe_count)
  83 {
  84         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  85                 CERROR("bad stripe count %d\n", stripe_count);
  86                 lov_dump_lmm_common(D_WARNING, lmm);
  87                 return -EINVAL;
  88         }
  89
  90         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  91                 CERROR("zero object id\n");
  92                 lov_dump_lmm_common(D_WARNING, lmm);
  93                 return -EINVAL;
  94         }
  95
  96         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  97                 CERROR("bad striping pattern\n");
  98                 lov_dump_lmm_common(D_WARNING, lmm);
  99                 return -EINVAL;
 100         }
 101
 102         if (lmm->lmm_stripe_size == 0 ||
 103             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
 104                 CERROR("bad stripe size %u\n",
 105                        le32_to_cpu(lmm->lmm_stripe_size));
 106                 lov_dump_lmm_common(D_WARNING, lmm);
 107                 return -EINVAL;
 108         }
 109         return 0;
 110 }
 111
 112 static void lsme_free(struct lov_stripe_md_entry *lsme)
 113 {
 114         unsigned int stripe_count = lsme->lsme_stripe_count;
 115         unsigned int i;
 116         size_t lsme_size;
 117
 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, 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)
 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_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 190         lsme->lsme_stripe_count = stripe_count;
 191         lsme->lsme_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 192
 193         if (pool_name != NULL) {
 194                 size_t pool_name_len;
 195
 196                 pool_name_len = strlcpy(lsme->lsme_pool_name, pool_name,
 197                                         sizeof(lsme->lsme_pool_name));
 198                 if (pool_name_len >= sizeof(lsme->lsme_pool_name))
 199                         GOTO(out_lsme, rc = -E2BIG);
 200         }
 201
 202         for (i = 0; i < stripe_count; i++) {
 203                 struct lov_oinfo *loi;
 204                 struct lov_tgt_desc *ltd;
 205
 206                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 207                 if (loi == NULL)
 208                         GOTO(out_lsme, rc = -ENOMEM);
 209
 210                 lsme->lsme_oinfo[i] = loi;
 211
 212                 ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 213                 loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 214                 loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 215                 if (lov_oinfo_is_dummy(loi))
 216                         continue;
 217
 218                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
 219                     !lov2obd(lov)->obd_process_conf) {
 220                         CERROR("%s: OST index %d more than OST count %d\n",
 221                                (char*)lov->desc.ld_uuid.uuid,
 222                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 223                         lov_dump_lmm_v1(D_WARNING, lmm);
 224                         GOTO(out_lsme, rc = -EINVAL);
 225                 }
 226
 227                 ltd = lov->lov_tgts[loi->loi_ost_idx];
 228                 if (ltd == NULL) {
 229                         CERROR("%s: OST index %d missing\n",
 230                                (char*)lov->desc.ld_uuid.uuid, loi->loi_ost_idx);
 231                         lov_dump_lmm_v1(D_WARNING, lmm);
 232                         continue;
 233                 }
 234
 235                 lov_bytes = lov_tgt_maxbytes(ltd);
 236                 if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
 237                         min_stripe_maxbytes = lov_bytes;
 238         }
 239
 240         if (min_stripe_maxbytes == 0)
 241                 min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 242
 243         lov_bytes = min_stripe_maxbytes * stripe_count;
 244
 245         if (maxbytes != NULL) {
 246                 if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
 247                         *maxbytes = MAX_LFS_FILESIZE;
 248                 else
 249                         *maxbytes = lov_bytes;
 250         }
 251
 252         return lsme;
 253
 254 out_lsme:
 255         for (i = 0; i < stripe_count; i++) {
 256                 struct lov_oinfo *loi = lsme->lsme_oinfo[i];
 257
 258                 if (loi != NULL)
 259                         OBD_SLAB_FREE_PTR(lsme->lsme_oinfo[i], lov_oinfo_slab);
 260         }
 261         OBD_FREE_LARGE(lsme, lsme_size);
 262
 263         return ERR_PTR(rc);
 264 }
 265
 266 static struct lov_stripe_md *
 267 lsm_unpackmd_v1v3(struct lov_obd *lov,
 268                   struct lov_mds_md *lmm, size_t buf_size,
 269                   const char *pool_name,
 270                   struct lov_ost_data_v1 *objects)
 271 {
 272         struct lov_stripe_md *lsm;
 273         struct lov_stripe_md_entry *lsme;
 274         size_t lsm_size;
 275         loff_t maxbytes;
 276         u32 pattern;
 277         int rc;
 278
 279         pattern = le32_to_cpu(lmm->lmm_pattern);
 280
 281         lsme = lsme_unpack(lov, lmm, buf_size, pool_name, objects, &maxbytes);
 282         if (IS_ERR(lsme))
 283                 RETURN(ERR_CAST(lsme));
 284
 285         lsme->lsme_extent.e_start = 0;
 286         lsme->lsme_extent.e_end = LUSTRE_EOF;
 287
 288         lsm_size = offsetof(typeof(*lsm), lsm_entries[1]);
 289         OBD_ALLOC(lsm, lsm_size);
 290         if (lsm == NULL)
 291                 GOTO(out_lsme, rc = -ENOMEM);
 292
 293         atomic_set(&lsm->lsm_refc, 1);
 294         spin_lock_init(&lsm->lsm_lock);
 295         lsm->lsm_maxbytes = maxbytes;
 296         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 297         lsm->lsm_magic = le32_to_cpu(lmm->lmm_magic);
 298         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 299         lsm->lsm_entry_count = 1;
 300         lsm->lsm_is_released = pattern & LOV_PATTERN_F_RELEASED;
 301         lsm->lsm_entries[0] = lsme;
 302
 303         return lsm;
 304
 305 out_lsme:
 306         lsme_free(lsme);
 307
 308         return ERR_PTR(rc);
 309 }
 310
 311 static inline struct lov_stripe_md *
 312 lsm_unpackmd_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 313 {
 314         struct lov_mds_md_v1 *lmm = buf;
 315
 316         return lsm_unpackmd_v1v3(lov, buf, buf_size, NULL, lmm->lmm_objects);
 317 }
 318
 319 const struct lsm_operations lsm_v1_ops = {
 320         .lsm_unpackmd           = lsm_unpackmd_v1,
 321 };
 322
 323 static inline struct lov_stripe_md *
 324 lsm_unpackmd_v3(struct lov_obd *lov, void *buf, size_t buf_size)
 325 {
 326         struct lov_mds_md_v3 *lmm = buf;
 327
 328         return lsm_unpackmd_v1v3(lov, buf, buf_size, lmm->lmm_pool_name,
 329                                  lmm->lmm_objects);
 330 }
 331
 332 const struct lsm_operations lsm_v3_ops = {
 333         .lsm_unpackmd           = lsm_unpackmd_v3,
 334 };
 335
 336 static int lsm_verify_comp_md_v1(struct lov_comp_md_v1 *lcm,
 337                                  size_t lcm_buf_size)
 338 {
 339         unsigned int entry_count;
 340         unsigned int i;
 341         size_t lcm_size;
 342
 343         lcm_size = le32_to_cpu(lcm->lcm_size);
 344         if (lcm_buf_size < lcm_size) {
 345                 CERROR("bad LCM buffer size %zu, expected %zu\n",
 346                        lcm_buf_size, lcm_size);
 347                 RETURN(-EINVAL);
 348         }
 349
 350         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 351         for (i = 0; i < entry_count; i++) {
 352                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 353                 size_t blob_offset;
 354                 size_t blob_size;
 355
 356                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 357                 blob_size = le32_to_cpu(lcme->lcme_size);
 358
 359                 if (lcm_size < blob_offset || lcm_size < blob_size ||
 360                     lcm_size < blob_offset + blob_size) {
 361                         CERROR("LCM entry %u has invalid blob: "
 362                                "LCM size = %zu, offset = %zu, size = %zu\n",
 363                                le32_to_cpu(lcme->lcme_id),
 364                                lcm_size, blob_offset, blob_size);
 365                         RETURN(-EINVAL);
 366                 }
 367         }
 368
 369         return 0;
 370 }
 371
 372 static struct lov_stripe_md_entry *
 373 lsme_unpack_comp(struct lov_obd *lov, struct lov_mds_md *lmm,
 374                  size_t lmm_buf_size, loff_t *maxbytes)
 375 {
 376         unsigned int magic;
 377         unsigned int stripe_count;
 378
 379         stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 380         if (stripe_count == 0)
 381                 RETURN(ERR_PTR(-EINVAL));
 382
 383         magic = le32_to_cpu(lmm->lmm_magic);
 384         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 385                 RETURN(ERR_PTR(-EINVAL));
 386
 387         if (lmm_buf_size < lov_mds_md_size(stripe_count, magic))
 388                 RETURN(ERR_PTR(-EINVAL));
 389
 390         if (magic == LOV_MAGIC_V1) {
 391                 return lsme_unpack(lov, lmm, lmm_buf_size, NULL,
 392                                    lmm->lmm_objects, maxbytes);
 393         } else {
 394                 struct lov_mds_md_v3 *lmm3 = (struct lov_mds_md_v3 *)lmm;
 395
 396                 return lsme_unpack(lov, lmm, lmm_buf_size, lmm3->lmm_pool_name,
 397                                    lmm3->lmm_objects, maxbytes);
 398         }
 399 }
 400
 401 static struct lov_stripe_md *
 402 lsm_unpackmd_comp_md_v1(struct lov_obd *lov, void *buf, size_t buf_size)
 403 {
 404         struct lov_comp_md_v1 *lcm = buf;
 405         struct lov_stripe_md *lsm;
 406         size_t lsm_size;
 407         unsigned int entry_count = 0;
 408         unsigned int i;
 409         loff_t maxbytes;
 410         int rc;
 411
 412         rc = lsm_verify_comp_md_v1(buf, buf_size);
 413         if (rc < 0)
 414                 return ERR_PTR(rc);
 415
 416         entry_count = le16_to_cpu(lcm->lcm_entry_count);
 417
 418         lsm_size = offsetof(typeof(*lsm), lsm_entries[entry_count]);
 419         OBD_ALLOC(lsm, lsm_size);
 420         if (lsm == NULL)
 421                 return ERR_PTR(-ENOMEM);
 422
 423         atomic_set(&lsm->lsm_refc, 1);
 424         spin_lock_init(&lsm->lsm_lock);
 425         lsm->lsm_magic = le32_to_cpu(lcm->lcm_magic);
 426         lsm->lsm_layout_gen = le32_to_cpu(lcm->lcm_layout_gen);
 427         lsm->lsm_entry_count = entry_count;
 428         lsm->lsm_is_released = true;
 429         lsm->lsm_maxbytes = LLONG_MIN;
 430
 431         for (i = 0; i < entry_count; i++) {
 432                 struct lov_comp_md_entry_v1 *lcme = &lcm->lcm_entries[i];
 433                 struct lov_stripe_md_entry *lsme;
 434                 size_t blob_offset;
 435                 size_t blob_size;
 436                 void *blob;
 437
 438                 blob_offset = le32_to_cpu(lcme->lcme_offset);
 439                 blob_size = le32_to_cpu(lcme->lcme_size);
 440                 blob = (char *)lcm + blob_offset;
 441
 442                 lsme = lsme_unpack_comp(lov, blob, blob_size,
 443                                         (i == entry_count - 1) ? &maxbytes :
 444                                                                  NULL);
 445                 if (IS_ERR(lsme))
 446                         GOTO(out_lsm, rc = PTR_ERR(lsme));
 447
 448                 if (!(lsme->lsme_pattern & LOV_PATTERN_F_RELEASED))
 449                         lsm->lsm_is_released = false;
 450
 451                 lsm->lsm_entries[i] = lsme;
 452                 lsme->lsme_id = le32_to_cpu(lcme->lcme_id);
 453                 lu_extent_le_to_cpu(&lsme->lsme_extent, &lcme->lcme_extent);
 454
 455                 if (i == entry_count - 1) {
 456                         lsm->lsm_maxbytes = (loff_t)lsme->lsme_extent.e_start +
 457                                             maxbytes;
 458                         /* the last component hasn't been defined, or
 459                          * lsm_maxbytes overflowed. */
 460                         if (lsme->lsme_extent.e_end != LUSTRE_EOF ||
 461                             lsm->lsm_maxbytes <
 462                             (loff_t)lsme->lsme_extent.e_start)
 463                                 lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
 464                 }
 465         }
 466
 467         RETURN(lsm);
 468
 469 out_lsm:
 470         for (i = 0; i < entry_count; i++)
 471                 if (lsm->lsm_entries[i] != NULL)
 472                         lsme_free(lsm->lsm_entries[i]);
 473
 474         OBD_FREE(lsm, lsm_size);
 475
 476         RETURN(ERR_PTR(rc));
 477 }
 478
 479 const struct lsm_operations lsm_comp_md_v1_ops = {
 480         .lsm_unpackmd         = lsm_unpackmd_comp_md_v1,
 481 };
 482
 483 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 484 {
 485         int i;
 486
 487         CDEBUG(level, "lsm %p, objid "DOSTID", maxbytes %#llx, magic 0x%08X, "
 488                "refc: %d, entry: %u, layout_gen %u\n",
 489                lsm, POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 490                atomic_read(&lsm->lsm_refc), lsm->lsm_entry_count,
 491                lsm->lsm_layout_gen);
 492
 493         for (i = 0; i < lsm->lsm_entry_count; i++) {
 494                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 495
 496                 CDEBUG(level,
 497                        DEXT ": id: %u, magic 0x%08X, stripe count %u, "
 498                        "size %u, layout_gen %u, pool: ["LOV_POOLNAMEF"]\n",
 499                        PEXT(&lse->lsme_extent), lse->lsme_id, lse->lsme_magic,
 500                        lse->lsme_stripe_count, lse->lsme_stripe_size,
 501                        lse->lsme_layout_gen, lse->lsme_pool_name);
 502         }
 503 }
 504
 505 int lov_lsm_entry(const struct lov_stripe_md *lsm, __u64 offset)
 506 {
 507         int i;
 508
 509         for (i = 0; i < lsm->lsm_entry_count; i++) {
 510                 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
 511
 512                 if ((offset >= lse->lsme_extent.e_start &&
 513                      offset < lse->lsme_extent.e_end) ||
 514                     (offset == OBD_OBJECT_EOF &&
 515                      lse->lsme_extent.e_end == OBD_OBJECT_EOF))
 516                         return i;
 517         }
 518
 519         return -1;
 520 }