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                            uint64_t dbwrap_flags)
  65 {
  66         struct db_context *result = NULL;
  67 #ifdef CLUSTER_SUPPORT
  68         const char *sockname;
  69 #endif
  70
  71         if (!DBWRAP_LOCK_ORDER_VALID(lock_order)) {
  72                 errno = EINVAL;
  73                 return NULL;
  74         }
  75
  76         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  77                 const char *base;
  78                 bool try_readonly = false;
  79
  80                 base = strrchr_m(name, '/');
  81                 if (base != NULL) {
  82                         base += 1;
  83                 } else {
  84                         base = name;
  85                 }
  86
  87                 if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
  88                         try_readonly = true;
  89                 }
  90
  91                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
  92                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
  93
  94                 if (try_readonly) {
  95                         dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  96                 } else {
  97                         dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  98                 }
  99         }
 100
 101 #ifdef CLUSTER_SUPPORT
 102         sockname = lp_ctdbd_socket();
 103
 104         if (lp_clustering()) {
 105                 const char *partname;
 106
 107                 if (!socket_exist(sockname)) {
 108                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
 109                                   "running?\n"));
 110                         return NULL;
 111                 }
 112
 113                 /* ctdb only wants the file part of the name */
 114                 partname = strrchr(name, '/');
 115                 if (partname) {
 116                         partname++;
 117                 } else {
 118                         partname = name;
 119                 }
 120                 /* allow ctdb for individual databases to be disabled */
 121                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 122                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 123                                               tdb_flags, open_flags, mode,
 124                                               lock_order, dbwrap_flags);
 125                         if (result == NULL) {
 126                                 DEBUG(0,("failed to attach to ctdb %s\n",
 127                                          partname));
 128                                 if (errno == 0) {
 129                                         errno = EIO;
 130                                 }
 131                                 return NULL;
 132                         }
 133                 }
 134         }
 135
 136 #endif
 137
 138         if (result == NULL) {
 139                 struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
 140                 result = dbwrap_local_open(mem_ctx, lp_ctx, name, hash_size,
 141                                            tdb_flags, open_flags, mode,
 142                                            lock_order, dbwrap_flags);
 143                 talloc_unlink(mem_ctx, lp_ctx);
 144         }
 145         return result;
 146 }