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 #ifdef CLUSTER_SUPPORT
  30 #include "ctdb_private.h"
  31 #endif
  32
  33 bool db_is_local(const char *name)
  34 {
  35 #ifdef CLUSTER_SUPPORT
  36         const char *sockname = lp_ctdbd_socket();
  37
  38         if (lp_clustering() && socket_exist(sockname)) {
  39                 const char *partname;
  40                 /* ctdb only wants the file part of the name */
  41                 partname = strrchr(name, '/');
  42                 if (partname) {
  43                         partname++;
  44                 } else {
  45                         partname = name;
  46                 }
  47                 /* allow ctdb for individual databases to be disabled */
  48                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  49                         return false;
  50                 }
  51         }
  52 #endif
  53         return true;
  54 }
  55
  56 /**
  57  * open a database
  58  */
  59 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  60                            const char *name,
  61                            int hash_size, int tdb_flags,
  62                            int open_flags, mode_t mode,
  63                            enum dbwrap_lock_order lock_order)
  64 {
  65         struct db_context *result = NULL;
  66 #ifdef CLUSTER_SUPPORT
  67         const char *sockname;
  68 #endif
  69
  70         switch (lock_order) {
  71         case DBWRAP_LOCK_ORDER_1:
  72         case DBWRAP_LOCK_ORDER_2:
  73         case DBWRAP_LOCK_ORDER_3:
  74                 break;
  75         default:
  76                 /*
  77                  * Only allow the 3 levels ctdb gives us.
  78                  */
  79                 errno = EINVAL;
  80                 return NULL;
  81         }
  82
  83 #ifdef CLUSTER_SUPPORT
  84         sockname = lp_ctdbd_socket();
  85
  86         if (lp_clustering()) {
  87                 const char *partname;
  88
  89                 if (!socket_exist(sockname)) {
  90                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
  91                                   "running?\n"));
  92                         return NULL;
  93                 }
  94
  95                 /* ctdb only wants the file part of the name */
  96                 partname = strrchr(name, '/');
  97                 if (partname) {
  98                         partname++;
  99                 } else {
 100                         partname = name;
 101                 }
 102                 /* allow ctdb for individual databases to be disabled */
 103                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 104                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 105                                               tdb_flags, open_flags, mode,
 106                                               lock_order);
 107                         if (result == NULL) {
 108                                 DEBUG(0,("failed to attach to ctdb %s\n",
 109                                          partname));
 110                                 if (errno == 0) {
 111                                         errno = EIO;
 112                                 }
 113                                 return NULL;
 114                         }
 115                 }
 116         }
 117
 118 #endif
 119
 120         if (result == NULL) {
 121                 struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
 122                 result = dbwrap_local_open(mem_ctx, lp_ctx, name, hash_size,
 123                                            tdb_flags, open_flags, mode,
 124                                            lock_order);
 125                 talloc_unlink(mem_ctx, lp_ctx);
 126         }
 127         return result;
 128 }