lib/tdb_compat/tdb_compat.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Compatibility layer for TDB1 vs TDB2.
   5
   6    Copyright (C) Rusty Russell 2011
   7
   8      ** NOTE! The following LGPL license applies to the tdb_compat
   9      ** library. This does NOT imply that all of Samba is released
  10      ** under the LGPL
  11
  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.
  16
  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.
  21
  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/>.
  24 */
  25 #ifndef TDB_COMPAT_H
  26 #define TDB_COMPAT_H
  27
  28 #include "replace.h"
  29 #include <ccan/typesafe_cb/typesafe_cb.h>
  30 #if BUILD_TDB2
  31 #include <tdb2.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34
  35 extern TDB_DATA tdb_null;
  36
  37 /* Old-style tdb_fetch. */
  38 static inline TDB_DATA tdb_fetch_compat(struct tdb_context *tdb, TDB_DATA k)
  39 {
  40         TDB_DATA dbuf;
  41         if (tdb_fetch(tdb, k, &dbuf) != TDB_SUCCESS) {
  42                 return tdb_null;
  43         }
  44         return dbuf;
  45 }
  46
  47 static inline TDB_DATA tdb_firstkey_compat(struct tdb_context *tdb)
  48 {
  49         TDB_DATA k;
  50         if (tdb_firstkey(tdb, &k) != TDB_SUCCESS) {
  51                 return tdb_null;
  52         }
  53         return k;
  54 }
  55
  56 /* Note: this frees the old key.dptr. */
  57 static inline TDB_DATA tdb_nextkey_compat(struct tdb_context *tdb, TDB_DATA k)
  58 {
  59         if (tdb_nextkey(tdb, &k) != TDB_SUCCESS) {
  60                 return tdb_null;
  61         }
  62         return k;
  63 }
  64
  65 #define tdb_traverse_read(tdb, fn, p)                                   \
  66         tdb_traverse_read_(tdb, typesafe_cb_preargs(int, void *, (fn), (p), \
  67                                                     struct tdb_context *, \
  68                                                     TDB_DATA, TDB_DATA), (p))
  69 int64_t tdb_traverse_read_(struct tdb_context *tdb,
  70                            int (*fn)(struct tdb_context *,
  71                                      TDB_DATA, TDB_DATA, void *), void *p);
  72
  73 /* Old-style tdb_errorstr */
  74 #define tdb_errorstr_compat(tdb) tdb_errorstr(tdb_error(tdb))
  75
  76 /* This typedef doesn't exist in TDB2. */
  77 typedef struct tdb_context TDB_CONTEXT;
  78
  79 /* We only need these for the CLEAR_IF_FIRST lock. */
  80 int tdb_reopen(struct tdb_context *tdb);
  81 int tdb_reopen_all(int parent_longlived);
  82
  83 /* These no longer exist in tdb2. */
  84 #define TDB_CLEAR_IF_FIRST 1048576
  85 #define TDB_INCOMPATIBLE_HASH 2097152
  86 #define TDB_VOLATILE 4194304
  87
  88 /* tdb2 does nonblocking functions via attibutes. */
  89 enum TDB_ERROR tdb_transaction_start_nonblock(struct tdb_context *tdb);
  90 enum TDB_ERROR tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key);
  91
  92
  93 /* Convenient (typesafe) wrapper for tdb open with logging */
  94 #define tdb_open_compat(name, hsize, tdb_fl, open_fl, mode, log_fn, log_data) \
  95         tdb_open_compat_((name), (hsize), (tdb_fl), (open_fl), (mode),  \
  96                          typesafe_cb_preargs(void, void *,              \
  97                                              (log_fn), (log_data),      \
  98                                              struct tdb_context *,      \
  99                                              enum tdb_log_level,        \
 100                                              enum TDB_ERROR,            \
 101                                              const char *),             \
 102                          (log_data))
 103
 104 struct tdb_context *
 105 tdb_open_compat_(const char *name, int hash_size,
 106                  int tdb_flags, int open_flags, mode_t mode,
 107                  void (*log_fn)(struct tdb_context *,
 108                                 enum tdb_log_level,
 109                                 enum TDB_ERROR ecode,
 110                                 const char *message,
 111                                 void *data),
 112                  void *log_data);
 113 #else
 114 #include <tdb.h>
 115
 116 /* FIXME: Inlining this is a bit lazy, but eases S3 build. */
 117 static inline struct tdb_context *
 118 tdb_open_compat(const char *name, int hash_size,
 119                 int tdb_flags, int open_flags, mode_t mode,
 120                 tdb_log_func log_fn, void *log_private)
 121 {
 122         struct tdb_logging_context lctx;
 123         lctx.log_fn = log_fn;
 124         lctx.log_private = log_private;
 125
 126         if (log_fn)
 127                 return tdb_open_ex(name, hash_size, tdb_flags, open_flags,
 128                                    mode, &lctx, NULL);
 129         else
 130                 return tdb_open(name, hash_size, tdb_flags, open_flags, mode);
 131 }
 132
 133 #define tdb_firstkey_compat tdb_firstkey
 134 /* Note: this frees the old key.dptr. */
 135 static inline TDB_DATA tdb_nextkey_compat(struct tdb_context *tdb, TDB_DATA k)
 136 {
 137         TDB_DATA next = tdb_nextkey(tdb, k);
 138         free(k.dptr);
 139         return next;
 140 }
 141 #define tdb_errorstr_compat(tdb) tdb_errorstr(tdb)
 142 #define tdb_fetch_compat tdb_fetch
 143 #endif
 144
 145 #endif /* TDB_COMPAT_H */