2 Unix SMB/CIFS implementation.
4 trivial database library - private includes
6 Copyright (C) Andrew Tridgell 2005
8 ** NOTE! The following LGPL license applies to the tdb
9 ** library. This does NOT imply that all of Samba is released
12 This library is free software; you can redistribute it and/or
13 modify it under the terms of the GNU Lesser General Public
14 License as published by the Free Software Foundation; either
15 version 3 of the License, or (at your option) any later version.
17 This library is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 Lesser General Public License for more details.
22 You should have received a copy of the GNU Lesser General Public
23 License along with this library; if not, see <http://www.gnu.org/licenses/>.
28 #include "system/filesys.h"
29 #include "system/time.h"
30 #include "system/shmem.h"
31 #include "system/select.h"
32 #include "system/wait.h"
41 #include <sys/select.h>
52 #include <sys/param.h>
55 #define __STRING(x) #x
58 #ifndef __STRINGSTRING
59 #define __STRINGSTRING(x) __STRING(x)
63 #define __LINESTR__ __STRINGSTRING(__LINE__)
67 #define __location__ __FILE__ ":" __LINESTR__
70 #include <atalk/util.h>
71 #include "atalk/tdb.h"
73 /* #define TDB_TRACE 1 */
74 #ifndef HAVE_GETPAGESIZE
75 #define getpagesize() 0x2000
78 typedef uint32_t tdb_len_t;
79 typedef uint32_t tdb_off_t;
82 #define offsetof(t,f) ((unsigned int)&((t *)0)->f)
85 #define TDB_MAGIC_FOOD "TDB file\n"
86 #define TDB_VERSION (0x26011967 + 6)
87 #define TDB_MAGIC (0x26011999U)
88 #define TDB_FREE_MAGIC (~TDB_MAGIC)
89 #define TDB_DEAD_MAGIC (0xFEE1DEAD)
90 #define TDB_RECOVERY_MAGIC (0xf53bc0e7U)
91 #define TDB_ALIGNMENT 4
92 #define DEFAULT_HASH_SIZE 131
93 #define FREELIST_TOP (sizeof(struct tdb_header))
94 #define TDB_ALIGN(x,a) (((x) + (a)-1) & ~((a)-1))
95 #define TDB_BYTEREV(x) (((((x)&0xff)<<24)|((x)&0xFF00)<<8)|(((x)>>8)&0xFF00)|((x)>>24))
96 #define TDB_DEAD(r) ((r)->magic == TDB_DEAD_MAGIC)
97 #define TDB_BAD_MAGIC(r) ((r)->magic != TDB_MAGIC && !TDB_DEAD(r))
98 #define TDB_HASH_TOP(hash) (FREELIST_TOP + (BUCKET(hash)+1)*sizeof(tdb_off_t))
99 #define TDB_HASHTABLE_SIZE(tdb) ((tdb->header.hash_size+1)*sizeof(tdb_off_t))
100 #define TDB_DATA_START(hash_size) (TDB_HASH_TOP(hash_size-1) + sizeof(tdb_off_t))
101 #define TDB_RECOVERY_HEAD offsetof(struct tdb_header, recovery_start)
102 #define TDB_SEQNUM_OFS offsetof(struct tdb_header, sequence_number)
103 #define TDB_PAD_BYTE 0x42
104 #define TDB_PAD_U32 0x42424242
106 /* NB assumes there is a local variable called "tdb" that is the
107 * current context, also takes doubly-parenthesized print-style
109 #define TDB_LOG(x) tdb->log.log_fn x
112 void tdb_trace(struct tdb_context *tdb, const char *op);
113 void tdb_trace_seqnum(struct tdb_context *tdb, uint32_t seqnum, const char *op);
114 void tdb_trace_open(struct tdb_context *tdb, const char *op,
115 unsigned hash_size, unsigned tdb_flags, unsigned open_flags);
116 void tdb_trace_ret(struct tdb_context *tdb, const char *op, int ret);
117 void tdb_trace_retrec(struct tdb_context *tdb, const char *op, TDB_DATA ret);
118 void tdb_trace_1rec(struct tdb_context *tdb, const char *op,
120 void tdb_trace_1rec_ret(struct tdb_context *tdb, const char *op,
121 TDB_DATA rec, int ret);
122 void tdb_trace_1rec_retrec(struct tdb_context *tdb, const char *op,
123 TDB_DATA rec, TDB_DATA ret);
124 void tdb_trace_2rec_flag_ret(struct tdb_context *tdb, const char *op,
125 TDB_DATA rec1, TDB_DATA rec2, unsigned flag,
127 void tdb_trace_2rec_retrec(struct tdb_context *tdb, const char *op,
128 TDB_DATA rec1, TDB_DATA rec2, TDB_DATA ret);
130 #define tdb_trace(tdb, op)
131 #define tdb_trace_seqnum(tdb, seqnum, op)
132 #define tdb_trace_open(tdb, op, hash_size, tdb_flags, open_flags)
133 #define tdb_trace_ret(tdb, op, ret)
134 #define tdb_trace_retrec(tdb, op, ret)
135 #define tdb_trace_1rec(tdb, op, rec)
136 #define tdb_trace_1rec_ret(tdb, op, rec, ret)
137 #define tdb_trace_1rec_retrec(tdb, op, rec, ret)
138 #define tdb_trace_2rec_flag_ret(tdb, op, rec1, rec2, flag, ret)
139 #define tdb_trace_2rec_retrec(tdb, op, rec1, rec2, ret)
140 #endif /* !TDB_TRACE */
143 #define GLOBAL_LOCK 0
144 #define ACTIVE_LOCK 4
145 #define TRANSACTION_LOCK 8
147 /* free memory if the pointer is valid and zero the pointer */
149 #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
152 #define BUCKET(hash) ((hash) % tdb->header.hash_size)
154 #define DOCONV() (tdb->flags & TDB_CONVERT)
155 #define CONVERT(x) (DOCONV() ? tdb_convert(&x, sizeof(x)) : &x)
158 /* the body of the database is made of one tdb_record for the free space
159 plus a separate data list for each hash value */
161 tdb_off_t next; /* offset of the next record in the list */
162 tdb_len_t rec_len; /* total byte length of record */
163 tdb_len_t key_len; /* byte length of key */
164 tdb_len_t data_len; /* byte length of data */
165 uint32_t full_hash; /* the full 32 bit hash of the key */
166 uint32_t magic; /* try to catch errors */
167 /* the following union is implied:
169 char record[rec_len];
174 uint32_t totalsize; (tailer)
180 /* this is stored at the front of every database */
182 char magic_food[32]; /* for /etc/magic */
183 uint32_t version; /* version of the code */
184 uint32_t hash_size; /* number of hash entries */
185 tdb_off_t rwlocks; /* obsolete - kept to detect old formats */
186 tdb_off_t recovery_start; /* offset of transaction recovery region */
187 tdb_off_t sequence_number; /* used when TDB_SEQNUM is set */
188 tdb_off_t reserved[29];
191 struct tdb_lock_type {
197 struct tdb_traverse_lock {
198 struct tdb_traverse_lock *next;
206 int (*tdb_read)(struct tdb_context *, tdb_off_t , void *, tdb_len_t , int );
207 int (*tdb_write)(struct tdb_context *, tdb_off_t, const void *, tdb_len_t);
208 void (*next_hash_chain)(struct tdb_context *, uint32_t *);
209 int (*tdb_oob)(struct tdb_context *, tdb_off_t , int );
210 int (*tdb_expand_file)(struct tdb_context *, tdb_off_t , tdb_off_t );
211 int (*tdb_brlock)(struct tdb_context *, tdb_off_t , int, int, int, size_t);
215 char *name; /* the name of the database */
216 void *map_ptr; /* where it is currently mapped */
217 int fd; /* open file descriptor for the database */
218 tdb_len_t map_size; /* how much space has been mapped */
219 int read_only; /* opened read-only */
220 int traverse_read; /* read-only traversal */
221 int traverse_write; /* read-write traversal */
222 struct tdb_lock_type global_lock;
224 struct tdb_lock_type *lockrecs; /* only real locks, all with count>0 */
225 enum TDB_ERROR ecode; /* error code for last tdb error */
226 struct tdb_header header; /* a cached copy of the header */
227 uint32_t flags; /* the flags passed to tdb_open */
228 struct tdb_traverse_lock travlocks; /* current traversal locks */
229 struct tdb_context *next; /* all tdbs to avoid multiple opens */
230 dev_t device; /* uniquely identifies this tdb */
231 ino_t inode; /* uniquely identifies this tdb */
232 struct tdb_logging_context log;
233 unsigned int (*hash_fn)(TDB_DATA *key);
234 int open_flags; /* flags used in the open - needed by reopen */
235 unsigned int num_locks; /* number of chain locks held */
236 const struct tdb_methods *methods;
237 struct tdb_transaction *transaction;
239 int max_dead_records;
240 int transaction_lock_count;
244 volatile sig_atomic_t *interrupt_sig_ptr;
251 int tdb_munmap(struct tdb_context *tdb);
252 void tdb_mmap(struct tdb_context *tdb);
253 int tdb_lock(struct tdb_context *tdb, int list, int ltype);
254 int tdb_lock_nonblock(struct tdb_context *tdb, int list, int ltype);
255 int tdb_unlock(struct tdb_context *tdb, int list, int ltype);
256 int tdb_brlock(struct tdb_context *tdb, tdb_off_t offset, int rw_type, int lck_type, int probe, size_t len);
257 int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
258 int tdb_transaction_unlock(struct tdb_context *tdb);
259 int tdb_brlock_upgrade(struct tdb_context *tdb, tdb_off_t offset, size_t len);
260 int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off);
261 int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off);
262 int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
263 int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
264 void *tdb_convert(void *buf, uint32_t size);
265 int tdb_free(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
266 tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct tdb_record *rec);
267 int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
268 int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
269 int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off);
270 int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off);
271 int _tdb_transaction_cancel(struct tdb_context *tdb);
272 int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
273 int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
274 int tdb_do_delete(struct tdb_context *tdb, tdb_off_t rec_ptr, struct tdb_record *rec);
275 unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len);
276 int tdb_parse_data(struct tdb_context *tdb, TDB_DATA key,
277 tdb_off_t offset, tdb_len_t len,
278 int (*parser)(TDB_DATA key, TDB_DATA data,
281 tdb_off_t tdb_find_lock_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash, int locktype,
282 struct tdb_record *rec);
283 void tdb_io_init(struct tdb_context *tdb);
284 int tdb_expand(struct tdb_context *tdb, tdb_off_t size);
285 int tdb_rec_free_read(struct tdb_context *tdb, tdb_off_t off,
286 struct tdb_record *rec);