source3/lib/dbwrap/dbwrap_open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper
   4
   5    Copyright (C) Volker Lendecke 2005-2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program 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
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_private.h"
  24 #include "dbwrap/dbwrap_open.h"
  25 #include "dbwrap/dbwrap_tdb.h"
  26 #include "dbwrap/dbwrap_ctdb.h"
  27 #include "lib/param/param.h"
  28 #include "util_tdb.h"
  29 #include "ctdbd_conn.h"
  30
  31 bool db_is_local(const char *name)
  32 {
  33 #ifdef CLUSTER_SUPPORT
  34         const char *sockname = lp_ctdbd_socket();
  35
  36         if (lp_clustering() && socket_exist(sockname)) {
  37                 const char *partname;
  38                 /* ctdb only wants the file part of the name */
  39                 partname = strrchr(name, '/');
  40                 if (partname) {
  41                         partname++;
  42                 } else {
  43                         partname = name;
  44                 }
  45                 /* allow ctdb for individual databases to be disabled */
  46                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  47                         return false;
  48                 }
  49         }
  50 #endif
  51         return true;
  52 }
  53
  54 /**
  55  * open a database
  56  */
  57 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  58                            const char *name,
  59                            int hash_size, int tdb_flags,
  60                            int open_flags, mode_t mode,
  61                            enum dbwrap_lock_order lock_order,
  62                            uint64_t dbwrap_flags)
  63 {
  64         struct db_context *result = NULL;
  65 #ifdef CLUSTER_SUPPORT
  66         const char *sockname;
  67 #endif
  68
  69         if (!DBWRAP_LOCK_ORDER_VALID(lock_order)) {
  70                 errno = EINVAL;
  71                 return NULL;
  72         }
  73
  74         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  75                 const char *base;
  76                 bool try_readonly = false;
  77
  78                 base = strrchr_m(name, '/');
  79                 if (base != NULL) {
  80                         base += 1;
  81                 } else {
  82                         base = name;
  83                 }
  84
  85                 if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
  86                         try_readonly = true;
  87                 }
  88
  89                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
  90                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
  91
  92                 if (try_readonly) {
  93                         dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  94                 } else {
  95                         dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  96                 }
  97         }
  98
  99 #ifdef CLUSTER_SUPPORT
 100         sockname = lp_ctdbd_socket();
 101
 102         if (lp_clustering()) {
 103                 const char *partname;
 104
 105                 if (!socket_exist(sockname)) {
 106                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
 107                                   "running?\n"));
 108                         return NULL;
 109                 }
 110
 111                 /* ctdb only wants the file part of the name */
 112                 partname = strrchr(name, '/');
 113                 if (partname) {
 114                         partname++;
 115                 } else {
 116                         partname = name;
 117                 }
 118                 /* allow ctdb for individual databases to be disabled */
 119                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 120                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 121                                               tdb_flags, open_flags, mode,
 122                                               lock_order, dbwrap_flags);
 123                         if (result == NULL) {
 124                                 DEBUG(0,("failed to attach to ctdb %s\n",
 125                                          partname));
 126                                 if (errno == 0) {
 127                                         errno = EIO;
 128                                 }
 129                                 return NULL;
 130                         }
 131                 }
 132         }
 133
 134 #endif
 135
 136         if (result == NULL) {
 137                 struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
 138                 result = dbwrap_local_open(mem_ctx, lp_ctx, name, hash_size,
 139                                            tdb_flags, open_flags, mode,
 140                                            lock_order, dbwrap_flags);
 141                 talloc_unlink(mem_ctx, lp_ctx);
 142         }
 143         return result;
 144 }