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 "util_tdb.h"
  28 #ifdef CLUSTER_SUPPORT
  29 #include "ctdb_private.h"
  30 #endif
  31
  32 bool db_is_local(const char *name)
  33 {
  34 #ifdef CLUSTER_SUPPORT
  35         const char *sockname = lp_ctdbd_socket();
  36
  37         if(!sockname || !*sockname) {
  38                 sockname = CTDB_PATH;
  39         }
  40
  41         if (lp_clustering() && socket_exist(sockname)) {
  42                 const char *partname;
  43                 /* ctdb only wants the file part of the name */
  44                 partname = strrchr(name, '/');
  45                 if (partname) {
  46                         partname++;
  47                 } else {
  48                         partname = name;
  49                 }
  50                 /* allow ctdb for individual databases to be disabled */
  51                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  52                         return false;
  53                 }
  54         }
  55 #endif
  56         return true;
  57 }
  58
  59 /**
  60  * open a database
  61  */
  62 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  63                            const char *name,
  64                            int hash_size, int tdb_flags,
  65                            int open_flags, mode_t mode,
  66                            enum dbwrap_lock_order lock_order)
  67 {
  68         struct db_context *result = NULL;
  69 #ifdef CLUSTER_SUPPORT
  70         const char *sockname;
  71 #endif
  72
  73         if ((lock_order != DBWRAP_LOCK_ORDER_1) &&
  74             (lock_order != DBWRAP_LOCK_ORDER_2)) {
  75                 /*
  76                  * Only allow 2 levels. ctdb gives us 3, and we will
  77                  * have the watchers database soon.
  78                  */
  79                 errno = EINVAL;
  80                 return NULL;
  81         }
  82
  83 #ifdef CLUSTER_SUPPORT
  84         sockname = lp_ctdbd_socket();
  85
  86         if(!sockname || !*sockname) {
  87                 sockname = CTDB_PATH;
  88         }
  89
  90         if (lp_clustering()) {
  91                 const char *partname;
  92
  93                 if (!socket_exist(sockname)) {
  94                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
  95                                   "running?\n"));
  96                         return NULL;
  97                 }
  98
  99                 /* ctdb only wants the file part of the name */
 100                 partname = strrchr(name, '/');
 101                 if (partname) {
 102                         partname++;
 103                 } else {
 104                         partname = name;
 105                 }
 106                 /* allow ctdb for individual databases to be disabled */
 107                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 108                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 109                                               tdb_flags, open_flags, mode,
 110                                               lock_order);
 111                         if (result == NULL) {
 112                                 DEBUG(0,("failed to attach to ctdb %s\n",
 113                                          partname));
 114                                 if (errno == 0) {
 115                                         errno = EIO;
 116                                 }
 117                                 return NULL;
 118                         }
 119                 }
 120         }
 121
 122 #endif
 123
 124         if (result == NULL) {
 125                 result = db_open_tdb(mem_ctx, name, hash_size,
 126                                      tdb_flags, open_flags, mode);
 127         }
 128         if (result != NULL) {
 129                 result->lock_order = lock_order;
 130         }
 131         return result;
 132 }