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