lib/tdb2/private.h

   1 #ifndef TDB_PRIVATE_H
   2 #define TDB_PRIVATE_H
   3  /*
   4    Trivial Database 2: private types and prototypes
   5    Copyright (C) Rusty Russell 2010
   6
   7    This library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 3 of the License, or (at your option) any later version.
  11
  12    This library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "tdb2.h"
  22 #include <ccan/likely/likely.h>
  23 #include <ccan/endian/endian.h>
  24
  25 #ifdef _SAMBA_BUILD_
  26 #include "replace.h"
  27 #include "system/filesys.h"
  28 #include "system/time.h"
  29 #include "system/shmem.h"
  30 #include "system/select.h"
  31 #include "system/wait.h"
  32 #else
  33 #include <stdint.h>
  34 #include <stdbool.h>
  35 #include <stdlib.h>
  36 #include <stddef.h>
  37 #include <sys/time.h>
  38 #include <sys/mman.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43 #include <utime.h>
  44 #include <unistd.h>
  45 #endif
  46
  47 #ifndef TEST_IT
  48 #define TEST_IT(cond)
  49 #endif
  50
  51 /* #define TDB_TRACE 1 */
  52
  53 #ifndef __STRING
  54 #define __STRING(x)    #x
  55 #endif
  56
  57 #ifndef __STRINGSTRING
  58 #define __STRINGSTRING(x) __STRING(x)
  59 #endif
  60
  61 #ifndef __location__
  62 #define __location__ __FILE__ ":" __STRINGSTRING(__LINE__)
  63 #endif
  64
  65 typedef uint64_t tdb_len_t;
  66 typedef uint64_t tdb_off_t;
  67
  68 #define TDB_MAGIC_FOOD "TDB file\n"
  69 #define TDB_VERSION ((uint64_t)(0x26011967 + 7))
  70 #define TDB1_VERSION (0x26011967 + 6)
  71 #define TDB_USED_MAGIC ((uint64_t)0x1999)
  72 #define TDB_HTABLE_MAGIC ((uint64_t)0x1888)
  73 #define TDB_CHAIN_MAGIC ((uint64_t)0x1777)
  74 #define TDB_FTABLE_MAGIC ((uint64_t)0x1666)
  75 #define TDB_FREE_MAGIC ((uint64_t)0xFE)
  76 #define TDB_HASH_MAGIC (0xA1ABE11A01092008ULL)
  77 #define TDB_RECOVERY_MAGIC (0xf53bc0e7ad124589ULL)
  78 #define TDB_RECOVERY_INVALID_MAGIC (0x0ULL)
  79
  80 #define TDB_OFF_IS_ERR(off) unlikely(off >= (tdb_off_t)TDB_ERR_LAST)
  81
  82 /* Packing errors into pointers and v.v. */
  83 #define TDB_PTR_IS_ERR(ptr) \
  84         unlikely((unsigned long)(ptr) >= (unsigned long)TDB_ERR_LAST)
  85 #define TDB_PTR_ERR(p) ((enum TDB_ERROR)(long)(p))
  86 #define TDB_ERR_PTR(err) ((void *)(long)(err))
  87
  88 /* Common case of returning true, false or -ve error. */
  89 typedef int tdb_bool_err;
  90
  91 /* Prevent others from opening the file. */
  92 #define TDB_OPEN_LOCK 0
  93 /* Expanding file. */
  94 #define TDB_EXPANSION_LOCK 2
  95 /* Doing a transaction. */
  96 #define TDB_TRANSACTION_LOCK 8
  97 /* Hash chain locks. */
  98 #define TDB_HASH_LOCK_START 64
  99
 100 /* Range for hash locks. */
 101 #define TDB_HASH_LOCK_RANGE_BITS 30
 102 #define TDB_HASH_LOCK_RANGE (1 << TDB_HASH_LOCK_RANGE_BITS)
 103
 104 /* We have 1024 entries in the top level. */
 105 #define TDB_TOPLEVEL_HASH_BITS 10
 106 /* And 64 entries in each sub-level: thus 64 bits exactly after 9 levels. */
 107 #define TDB_SUBLEVEL_HASH_BITS 6
 108 /* And 8 entries in each group, ie 8 groups per sublevel. */
 109 #define TDB_HASH_GROUP_BITS 3
 110 /* This is currently 10: beyond this we chain. */
 111 #define TDB_MAX_LEVELS (1+(64-TDB_TOPLEVEL_HASH_BITS) / TDB_SUBLEVEL_HASH_BITS)
 112
 113 /* Extend file by least 100 times larger than needed. */
 114 #define TDB_EXTENSION_FACTOR 100
 115
 116 /* We steal bits from the offsets to store hash info. */
 117 #define TDB_OFF_HASH_GROUP_MASK ((1ULL << TDB_HASH_GROUP_BITS) - 1)
 118 /* We steal this many upper bits, giving a maximum offset of 64 exabytes. */
 119 #define TDB_OFF_UPPER_STEAL 8
 120 #define   TDB_OFF_UPPER_STEAL_EXTRA 7
 121 /* The bit number where we store extra hash bits. */
 122 #define TDB_OFF_HASH_EXTRA_BIT 57
 123 #define TDB_OFF_UPPER_STEAL_SUBHASH_BIT 56
 124
 125 /* Additional features we understand.  Currently: none. */
 126 #define TDB_FEATURE_MASK ((uint64_t)0)
 127
 128 /* The bit number where we store the extra hash bits. */
 129 /* Convenience mask to get actual offset. */
 130 #define TDB_OFF_MASK \
 131         (((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1) - TDB_OFF_HASH_GROUP_MASK)
 132
 133 /* How many buckets in a free list: see size_to_bucket(). */
 134 #define TDB_FREE_BUCKETS (64 - TDB_OFF_UPPER_STEAL)
 135
 136 /* We have to be able to fit a free record here. */
 137 #define TDB_MIN_DATA_LEN        \
 138         (sizeof(struct tdb_free_record) - sizeof(struct tdb_used_record))
 139
 140 /* Indicates this entry is not on an flist (can happen during coalescing) */
 141 #define TDB_FTABLE_NONE ((1ULL << TDB_OFF_UPPER_STEAL) - 1)
 142
 143 struct tdb_used_record {
 144         /* For on-disk compatibility, we avoid bitfields:
 145            magic: 16,        (highest)
 146            key_len_bits: 5,
 147            extra_padding: 32
 148            hash_bits: 11
 149         */
 150         uint64_t magic_and_meta;
 151         /* The bottom key_len_bits*2 are key length, rest is data length. */
 152         uint64_t key_and_data_len;
 153 };
 154
 155 static inline unsigned rec_key_bits(const struct tdb_used_record *r)
 156 {
 157         return ((r->magic_and_meta >> 43) & ((1 << 5)-1)) * 2;
 158 }
 159
 160 static inline uint64_t rec_key_length(const struct tdb_used_record *r)
 161 {
 162         return r->key_and_data_len & ((1ULL << rec_key_bits(r)) - 1);
 163 }
 164
 165 static inline uint64_t rec_data_length(const struct tdb_used_record *r)
 166 {
 167         return r->key_and_data_len >> rec_key_bits(r);
 168 }
 169
 170 static inline uint64_t rec_extra_padding(const struct tdb_used_record *r)
 171 {
 172         return (r->magic_and_meta >> 11) & 0xFFFFFFFF;
 173 }
 174
 175 static inline uint32_t rec_hash(const struct tdb_used_record *r)
 176 {
 177         return r->magic_and_meta & ((1 << 11) - 1);
 178 }
 179
 180 static inline uint16_t rec_magic(const struct tdb_used_record *r)
 181 {
 182         return (r->magic_and_meta >> 48);
 183 }
 184
 185 struct tdb_free_record {
 186         uint64_t magic_and_prev; /* TDB_OFF_UPPER_STEAL bits magic, then prev */
 187         uint64_t ftable_and_len; /* Len not counting these two fields. */
 188         /* This is why the minimum record size is 8 bytes.  */
 189         uint64_t next;
 190 };
 191
 192 static inline uint64_t frec_prev(const struct tdb_free_record *f)
 193 {
 194         return f->magic_and_prev & ((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1);
 195 }
 196
 197 static inline uint64_t frec_magic(const struct tdb_free_record *f)
 198 {
 199         return f->magic_and_prev >> (64 - TDB_OFF_UPPER_STEAL);
 200 }
 201
 202 static inline uint64_t frec_len(const struct tdb_free_record *f)
 203 {
 204         return f->ftable_and_len & ((1ULL << (64 - TDB_OFF_UPPER_STEAL))-1);
 205 }
 206
 207 static inline unsigned frec_ftable(const struct tdb_free_record *f)
 208 {
 209         return f->ftable_and_len >> (64 - TDB_OFF_UPPER_STEAL);
 210 }
 211
 212 struct tdb_recovery_record {
 213         uint64_t magic;
 214         /* Length of record (add this header to get total length). */
 215         uint64_t max_len;
 216         /* Length used. */
 217         uint64_t len;
 218         /* Old length of file before transaction. */
 219         uint64_t eof;
 220 };
 221
 222 /* If we bottom out of the subhashes, we chain. */
 223 struct tdb_chain {
 224         tdb_off_t rec[1 << TDB_HASH_GROUP_BITS];
 225         tdb_off_t next;
 226 };
 227
 228 /* this is stored at the front of every database */
 229 struct tdb_header {
 230         char magic_food[64]; /* for /etc/magic */
 231         /* FIXME: Make me 32 bit? */
 232         uint64_t version; /* version of the code */
 233         uint64_t hash_test; /* result of hashing HASH_MAGIC. */
 234         uint64_t hash_seed; /* "random" seed written at creation time. */
 235         tdb_off_t free_table; /* (First) free table. */
 236         tdb_off_t recovery; /* Transaction recovery area. */
 237
 238         uint64_t features_used; /* Features all writers understand */
 239         uint64_t features_offered; /* Features offered */
 240
 241         uint64_t seqnum; /* Sequence number for TDB_SEQNUM */
 242
 243         tdb_off_t reserved[23];
 244
 245         /* Top level hash table. */
 246         tdb_off_t hashtable[1ULL << TDB_TOPLEVEL_HASH_BITS];
 247 };
 248
 249 struct tdb_freetable {
 250         struct tdb_used_record hdr;
 251         tdb_off_t next;
 252         tdb_off_t buckets[TDB_FREE_BUCKETS];
 253 };
 254
 255 /* Information about a particular (locked) hash entry. */
 256 struct hash_info {
 257         /* Full hash value of entry. */
 258         uint64_t h;
 259         /* Start and length of lock acquired. */
 260         tdb_off_t hlock_start;
 261         tdb_len_t hlock_range;
 262         /* Start of hash group. */
 263         tdb_off_t group_start;
 264         /* Bucket we belong in. */
 265         unsigned int home_bucket;
 266         /* Bucket we (or an empty space) were found in. */
 267         unsigned int found_bucket;
 268         /* How many bits of the hash are already used. */
 269         unsigned int hash_used;
 270         /* Current working group. */
 271         tdb_off_t group[1 << TDB_HASH_GROUP_BITS];
 272 };
 273
 274 struct traverse_info {
 275         struct traverse_level {
 276                 tdb_off_t hashtable;
 277                 /* We ignore groups here, and treat it as a big array. */
 278                 unsigned entry;
 279                 unsigned int total_buckets;
 280         } levels[TDB_MAX_LEVELS + 1];
 281         unsigned int num_levels;
 282         unsigned int toplevel_group;
 283         /* This makes delete-everything-inside-traverse work as expected. */
 284         tdb_off_t prev;
 285 };
 286
 287 typedef uint32_t tdb1_len_t;
 288 typedef uint32_t tdb1_off_t;
 289
 290 enum tdb_lock_flags {
 291         /* WAIT == F_SETLKW, NOWAIT == F_SETLK */
 292         TDB_LOCK_NOWAIT = 0,
 293         TDB_LOCK_WAIT = 1,
 294         /* If set, don't log an error on failure. */
 295         TDB_LOCK_PROBE = 2,
 296         /* If set, don't check for recovery (used by recovery code). */
 297         TDB_LOCK_NOCHECK = 4,
 298 };
 299
 300 struct tdb_lock {
 301         struct tdb_context *owner;
 302         off_t off;
 303         uint32_t count;
 304         uint32_t ltype;
 305 };
 306
 307 /* This is only needed for tdb_access_commit, but used everywhere to
 308  * simplify. */
 309 struct tdb_access_hdr {
 310         struct tdb_access_hdr *next;
 311         tdb_off_t off;
 312         tdb_len_t len;
 313         bool convert;
 314 };
 315
 316 struct tdb_file {
 317         /* How many are sharing us? */
 318         unsigned int refcnt;
 319
 320         /* Mmap (if any), or malloc (for TDB_INTERNAL). */
 321         void *map_ptr;
 322
 323         /* How much space has been mapped (<= current file size) */
 324         tdb_len_t map_size;
 325
 326         /* The file descriptor (-1 for TDB_INTERNAL). */
 327         int fd;
 328
 329         /* Lock information */
 330         pid_t locker;
 331         struct tdb_lock allrecord_lock;
 332         size_t num_lockrecs;
 333         struct tdb_lock *lockrecs;
 334
 335         /* Identity of this file. */
 336         dev_t device;
 337         ino_t inode;
 338 };
 339
 340 struct tdb_methods {
 341         enum TDB_ERROR (*tread)(struct tdb_context *, tdb_off_t, void *,
 342                                 tdb_len_t);
 343         enum TDB_ERROR (*twrite)(struct tdb_context *, tdb_off_t, const void *,
 344                                  tdb_len_t);
 345         enum TDB_ERROR (*oob)(struct tdb_context *, tdb_off_t, bool);
 346         enum TDB_ERROR (*expand_file)(struct tdb_context *, tdb_len_t);
 347         void *(*direct)(struct tdb_context *, tdb_off_t, size_t, bool);
 348 };
 349
 350 /*
 351   internal prototypes
 352 */
 353 /* hash.c: */
 354 uint64_t tdb_jenkins_hash(const void *key, size_t length, uint64_t seed,
 355                           void *unused);
 356
 357 tdb_bool_err first_in_hash(struct tdb_context *tdb,
 358                            struct traverse_info *tinfo,
 359                            TDB_DATA *kbuf, size_t *dlen);
 360
 361 tdb_bool_err next_in_hash(struct tdb_context *tdb,
 362                           struct traverse_info *tinfo,
 363                           TDB_DATA *kbuf, size_t *dlen);
 364
 365 /* Hash random memory. */
 366 uint64_t tdb_hash(struct tdb_context *tdb, const void *ptr, size_t len);
 367
 368 /* Hash on disk. */
 369 uint64_t hash_record(struct tdb_context *tdb, tdb_off_t off);
 370
 371 /* Find and lock a hash entry (or where it would be). */
 372 tdb_off_t find_and_lock(struct tdb_context *tdb,
 373                         struct tdb_data key,
 374                         int ltype,
 375                         struct hash_info *h,
 376                         struct tdb_used_record *rec,
 377                         struct traverse_info *tinfo);
 378
 379 enum TDB_ERROR replace_in_hash(struct tdb_context *tdb,
 380                                struct hash_info *h,
 381                                tdb_off_t new_off);
 382
 383 enum TDB_ERROR add_to_hash(struct tdb_context *tdb, struct hash_info *h,
 384                            tdb_off_t new_off);
 385
 386 enum TDB_ERROR delete_from_hash(struct tdb_context *tdb, struct hash_info *h);
 387
 388 /* For tdb_check */
 389 bool is_subhash(tdb_off_t val);
 390
 391 /* free.c: */
 392 enum TDB_ERROR tdb_ftable_init(struct tdb_context *tdb);
 393
 394 /* check.c needs these to iterate through free lists. */
 395 tdb_off_t first_ftable(struct tdb_context *tdb);
 396 tdb_off_t next_ftable(struct tdb_context *tdb, tdb_off_t ftable);
 397
 398 /* This returns space or -ve error number. */
 399 tdb_off_t alloc(struct tdb_context *tdb, size_t keylen, size_t datalen,
 400                 uint64_t hash, unsigned magic, bool growing);
 401
 402 /* Put this record in a free list. */
 403 enum TDB_ERROR add_free_record(struct tdb_context *tdb,
 404                                tdb_off_t off, tdb_len_t len_with_header,
 405                                enum tdb_lock_flags waitflag,
 406                                bool coalesce_ok);
 407
 408 /* Set up header for a used/ftable/htable/chain record. */
 409 enum TDB_ERROR set_header(struct tdb_context *tdb,
 410                           struct tdb_used_record *rec,
 411                           unsigned magic, uint64_t keylen, uint64_t datalen,
 412                           uint64_t actuallen, unsigned hashlow);
 413
 414 /* Used by tdb_check to verify. */
 415 unsigned int size_to_bucket(tdb_len_t data_len);
 416 tdb_off_t bucket_off(tdb_off_t ftable_off, unsigned bucket);
 417
 418 /* Used by tdb_summary */
 419 tdb_off_t dead_space(struct tdb_context *tdb, tdb_off_t off);
 420
 421 /* io.c: */
 422 /* Initialize tdb->methods. */
 423 void tdb_io_init(struct tdb_context *tdb);
 424
 425 /* Convert endian of the buffer if required. */
 426 void *tdb_convert(const struct tdb_context *tdb, void *buf, tdb_len_t size);
 427
 428 /* Unmap and try to map the tdb. */
 429 void tdb_munmap(struct tdb_file *file);
 430 void tdb_mmap(struct tdb_context *tdb);
 431
 432 /* Either alloc a copy, or give direct access.  Release frees or noop. */
 433 const void *tdb_access_read(struct tdb_context *tdb,
 434                             tdb_off_t off, tdb_len_t len, bool convert);
 435 void *tdb_access_write(struct tdb_context *tdb,
 436                        tdb_off_t off, tdb_len_t len, bool convert);
 437
 438 /* Release result of tdb_access_read/write. */
 439 void tdb_access_release(struct tdb_context *tdb, const void *p);
 440 /* Commit result of tdb_acces_write. */
 441 enum TDB_ERROR tdb_access_commit(struct tdb_context *tdb, void *p);
 442
 443 /* Convenience routine to get an offset. */
 444 tdb_off_t tdb_read_off(struct tdb_context *tdb, tdb_off_t off);
 445
 446 /* Write an offset at an offset. */
 447 enum TDB_ERROR tdb_write_off(struct tdb_context *tdb, tdb_off_t off,
 448                              tdb_off_t val);
 449
 450 /* Clear an ondisk area. */
 451 enum TDB_ERROR zero_out(struct tdb_context *tdb, tdb_off_t off, tdb_len_t len);
 452
 453 /* Return a non-zero offset between >= start < end in this array (or end). */
 454 tdb_off_t tdb_find_nonzero_off(struct tdb_context *tdb,
 455                                tdb_off_t base,
 456                                uint64_t start,
 457                                uint64_t end);
 458
 459 /* Return a zero offset in this array, or num. */
 460 tdb_off_t tdb_find_zero_off(struct tdb_context *tdb, tdb_off_t off,
 461                             uint64_t num);
 462
 463 /* Allocate and make a copy of some offset. */
 464 void *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len);
 465
 466 /* Writes a converted copy of a record. */
 467 enum TDB_ERROR tdb_write_convert(struct tdb_context *tdb, tdb_off_t off,
 468                                  const void *rec, size_t len);
 469
 470 /* Reads record and converts it */
 471 enum TDB_ERROR tdb_read_convert(struct tdb_context *tdb, tdb_off_t off,
 472                                 void *rec, size_t len);
 473
 474 /* Bump the seqnum (caller checks for tdb->flags & TDB_SEQNUM) */
 475 void tdb_inc_seqnum(struct tdb_context *tdb);
 476
 477 /* lock.c: */
 478 /* Lock/unlock a range of hashes. */
 479 enum TDB_ERROR tdb_lock_hashes(struct tdb_context *tdb,
 480                                tdb_off_t hash_lock, tdb_len_t hash_range,
 481                                int ltype, enum tdb_lock_flags waitflag);
 482 enum TDB_ERROR tdb_unlock_hashes(struct tdb_context *tdb,
 483                                  tdb_off_t hash_lock,
 484                                  tdb_len_t hash_range, int ltype);
 485
 486 /* For closing the file. */
 487 void tdb_lock_cleanup(struct tdb_context *tdb);
 488
 489 /* Lock/unlock a particular free bucket. */
 490 enum TDB_ERROR tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
 491                                     enum tdb_lock_flags waitflag);
 492 void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off);
 493
 494 /* Serialize transaction start. */
 495 enum TDB_ERROR tdb_transaction_lock(struct tdb_context *tdb, int ltype);
 496 void tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
 497
 498 /* Do we have any hash locks (ie. via tdb_chainlock) ? */
 499 bool tdb_has_hash_locks(struct tdb_context *tdb);
 500
 501 /* Lock entire database. */
 502 enum TDB_ERROR tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
 503                                   enum tdb_lock_flags flags, bool upgradable);
 504 void tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
 505 enum TDB_ERROR tdb_allrecord_upgrade(struct tdb_context *tdb, off_t start);
 506
 507 /* Serialize db open. */
 508 enum TDB_ERROR tdb_lock_open(struct tdb_context *tdb,
 509                              int ltype, enum tdb_lock_flags flags);
 510 void tdb_unlock_open(struct tdb_context *tdb, int ltype);
 511 bool tdb_has_open_lock(struct tdb_context *tdb);
 512
 513 /* Serialize db expand. */
 514 enum TDB_ERROR tdb_lock_expand(struct tdb_context *tdb, int ltype);
 515 void tdb_unlock_expand(struct tdb_context *tdb, int ltype);
 516 bool tdb_has_expansion_lock(struct tdb_context *tdb);
 517
 518 /* If it needs recovery, grab all the locks and do it. */
 519 enum TDB_ERROR tdb_lock_and_recover(struct tdb_context *tdb);
 520
 521 /* Byte-range lock wrappers for TDB1 to access. */
 522 enum TDB_ERROR tdb_brlock(struct tdb_context *tdb,
 523                           int rw_type, tdb_off_t offset, tdb_off_t len,
 524                           enum tdb_lock_flags flags);
 525
 526 enum TDB_ERROR tdb_brunlock(struct tdb_context *tdb,
 527                             int rw_type, tdb_off_t offset, size_t len);
 528
 529 enum TDB_ERROR tdb_nest_lock(struct tdb_context *tdb,
 530                              tdb_off_t offset, int ltype,
 531                              enum tdb_lock_flags flags);
 532
 533 enum TDB_ERROR tdb_nest_unlock(struct tdb_context *tdb,
 534                                tdb_off_t off, int ltype);
 535
 536 enum TDB_ERROR tdb_lock_gradual(struct tdb_context *tdb,
 537                                 int ltype, enum tdb_lock_flags flags,
 538                                 tdb_off_t off, tdb_off_t len);
 539
 540 /* Default lock and unlock functions. */
 541 int tdb_fcntl_lock(int fd, int rw, off_t off, off_t len, bool waitflag, void *);
 542 int tdb_fcntl_unlock(int fd, int rw, off_t off, off_t len, void *);
 543
 544 /* transaction.c: */
 545 enum TDB_ERROR tdb_transaction_recover(struct tdb_context *tdb);
 546 tdb_bool_err tdb_needs_recovery(struct tdb_context *tdb);
 547
 548 /* this is stored at the front of every database */
 549 struct tdb1_header {
 550         char magic_food[32]; /* for /etc/magic */
 551         uint32_t version; /* version of the code */
 552         uint32_t hash_size; /* number of hash entries */
 553         tdb1_off_t rwlocks; /* obsolete - kept to detect old formats */
 554         tdb1_off_t recovery_start; /* offset of transaction recovery region */
 555         tdb1_off_t sequence_number; /* used when TDB1_SEQNUM is set */
 556         uint32_t magic1_hash; /* hash of TDB_MAGIC_FOOD. */
 557         uint32_t magic2_hash; /* hash of TDB1_MAGIC. */
 558         tdb1_off_t reserved[27];
 559 };
 560
 561 struct tdb1_traverse_lock {
 562         struct tdb1_traverse_lock *next;
 563         uint32_t off;
 564         uint32_t hash;
 565         int lock_rw;
 566 };
 567
 568 struct tdb_context {
 569         /* Single list of all TDBs, to detect multiple opens. */
 570         struct tdb_context *next;
 571
 572         /* Filename of the database. */
 573         const char *name;
 574
 575         /* Logging function */
 576         void (*log_fn)(struct tdb_context *tdb,
 577                        enum tdb_log_level level,
 578                        enum TDB_ERROR ecode,
 579                        const char *message,
 580                        void *data);
 581         void *log_data;
 582
 583         /* Open flags passed to tdb_open. */
 584         int open_flags;
 585
 586         /* low level (fnctl) lock functions. */
 587         int (*lock_fn)(int fd, int rw, off_t off, off_t len, bool w, void *);
 588         int (*unlock_fn)(int fd, int rw, off_t off, off_t len, void *);
 589         void *lock_data;
 590
 591         /* the tdb flags passed to tdb_open. */
 592         uint32_t flags;
 593
 594         /* Our statistics. */
 595         struct tdb_attribute_stats stats;
 596
 597         /* The actual file information */
 598         struct tdb_file *file;
 599
 600         /* Hash function. */
 601         uint64_t (*hash_fn)(const void *key, size_t len, uint64_t seed, void *);
 602         void *hash_data;
 603         uint64_t hash_seed;
 604
 605         /* Our open hook, if any. */
 606         enum TDB_ERROR (*openhook)(int fd, void *data);
 607         void *openhook_data;
 608
 609         /* Last error we returned. */
 610         enum TDB_ERROR last_error;
 611
 612         struct {
 613
 614                 /* Are we accessing directly? (debugging check). */
 615                 int direct_access;
 616
 617                 /* Set if we are in a transaction. */
 618                 struct tdb_transaction *transaction;
 619
 620                 /* What free table are we using? */
 621                 tdb_off_t ftable_off;
 622                 unsigned int ftable;
 623
 624                 /* IO methods: changes for transactions. */
 625                 const struct tdb_methods *io;
 626
 627                 /* Direct access information */
 628                 struct tdb_access_hdr *access;
 629         } tdb2;
 630
 631         struct {
 632                 int traverse_read; /* read-only traversal */
 633                 int traverse_write; /* read-write traversal */
 634
 635                 struct tdb1_header header; /* a cached copy of the header */
 636                 struct tdb1_traverse_lock travlocks; /* current traversal locks */
 637                 const struct tdb1_methods *io;
 638                 struct tdb1_transaction *transaction;
 639                 int page_size;
 640                 int max_dead_records;
 641         } tdb1;
 642 };
 643
 644 #define TDB1_BYTEREV(x) (((((x)&0xff)<<24)|((x)&0xFF00)<<8)|(((x)>>8)&0xFF00)|((x)>>24))
 645
 646 /* tdb1_open.c: */
 647 int tdb1_new_database(struct tdb_context *tdb,
 648                       struct tdb_attribute_tdb1_hashsize *hashsize);
 649 enum TDB_ERROR tdb1_open(struct tdb_context *tdb);
 650
 651 /* tdb1_io.c: */
 652 enum TDB_ERROR tdb1_probe_length(struct tdb_context *tdb);
 653
 654 /* tdb1_lock.c: */
 655 int tdb1_allrecord_unlock(struct tdb_context *tdb, int ltype);
 656
 657 /* tdb1_transaction.c: */
 658 int tdb1_transaction_recover(struct tdb_context *tdb);
 659 int tdb1_transaction_cancel(struct tdb_context *tdb);
 660
 661 /* tdb1_tdb.c: */
 662 int tdb1_store(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
 663 enum TDB_ERROR tdb1_fetch(struct tdb_context *tdb, TDB_DATA key,
 664                           TDB_DATA *data);
 665
 666 /* tdb.c: */
 667 enum TDB_ERROR COLD tdb_logerr(struct tdb_context *tdb,
 668                                enum TDB_ERROR ecode,
 669                                enum tdb_log_level level,
 670                                const char *fmt, ...);
 671
 672 #ifdef TDB_TRACE
 673 void tdb_trace(struct tdb_context *tdb, const char *op);
 674 void tdb_trace_seqnum(struct tdb_context *tdb, uint32_t seqnum, const char *op);
 675 void tdb_trace_open(struct tdb_context *tdb, const char *op,
 676                     unsigned hash_size, unsigned tdb_flags, unsigned open_flags);
 677 void tdb_trace_ret(struct tdb_context *tdb, const char *op, int ret);
 678 void tdb_trace_retrec(struct tdb_context *tdb, const char *op, TDB_DATA ret);
 679 void tdb_trace_1rec(struct tdb_context *tdb, const char *op,
 680                     TDB_DATA rec);
 681 void tdb_trace_1rec_ret(struct tdb_context *tdb, const char *op,
 682                         TDB_DATA rec, int ret);
 683 void tdb_trace_1rec_retrec(struct tdb_context *tdb, const char *op,
 684                            TDB_DATA rec, TDB_DATA ret);
 685 void tdb_trace_2rec_flag_ret(struct tdb_context *tdb, const char *op,
 686                              TDB_DATA rec1, TDB_DATA rec2, unsigned flag,
 687                              int ret);
 688 void tdb_trace_2rec_retrec(struct tdb_context *tdb, const char *op,
 689                            TDB_DATA rec1, TDB_DATA rec2, TDB_DATA ret);
 690 #else
 691 #define tdb_trace(tdb, op)
 692 #define tdb_trace_seqnum(tdb, seqnum, op)
 693 #define tdb_trace_open(tdb, op, hash_size, tdb_flags, open_flags)
 694 #define tdb_trace_ret(tdb, op, ret)
 695 #define tdb_trace_retrec(tdb, op, ret)
 696 #define tdb_trace_1rec(tdb, op, rec)
 697 #define tdb_trace_1rec_ret(tdb, op, rec, ret)
 698 #define tdb_trace_1rec_retrec(tdb, op, rec, ret)
 699 #define tdb_trace_2rec_flag_ret(tdb, op, rec1, rec2, flag, ret)
 700 #define tdb_trace_2rec_retrec(tdb, op, rec1, rec2, ret)
 701 #endif /* !TDB_TRACE */
 702
 703 #endif