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