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 "lib/cluster_support.h"
  29 #include "util_tdb.h"
  30 #include "ctdbd_conn.h"
  31 #include "messages.h"
  32
  33 bool db_is_local(const char *name)
  34 {
  35         const char *sockname = lp_ctdbd_socket();
  36
  37         if (lp_clustering() && socket_exist(sockname)) {
  38                 const char *partname;
  39                 /* ctdb only wants the file part of the name */
  40                 partname = strrchr(name, '/');
  41                 if (partname) {
  42                         partname++;
  43                 } else {
  44                         partname = name;
  45                 }
  46                 /* allow ctdb for individual databases to be disabled */
  47                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  48                         return false;
  49                 }
  50         }
  51
  52         return true;
  53 }
  54
  55 /**
  56  * open a database
  57  */
  58 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  59                            const char *name,
  60                            int hash_size, int tdb_flags,
  61                            int open_flags, mode_t mode,
  62                            enum dbwrap_lock_order lock_order,
  63                            uint64_t dbwrap_flags)
  64 {
  65         struct db_context *result = NULL;
  66         const char *sockname;
  67
  68         if (!DBWRAP_LOCK_ORDER_VALID(lock_order)) {
  69                 errno = EINVAL;
  70                 return NULL;
  71         }
  72
  73         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  74                 const char *base;
  75                 bool try_readonly = false;
  76
  77                 base = strrchr_m(name, '/');
  78                 if (base != NULL) {
  79                         base += 1;
  80                 } else {
  81                         base = name;
  82                 }
  83
  84                 if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
  85                         try_readonly = true;
  86                 }
  87
  88                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
  89                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
  90
  91                 if (try_readonly) {
  92                         dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  93                 } else {
  94                         dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  95                 }
  96         }
  97
  98         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  99                 const char *base;
 100                 bool try_mutex = false;
 101                 bool require_mutex = false;
 102
 103                 base = strrchr_m(name, '/');
 104                 if (base != NULL) {
 105                         base += 1;
 106                 } else {
 107                         base = name;
 108                 }
 109
 110                 try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", "*", try_mutex);
 111                 try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", base, try_mutex);
 112
 113                 if (try_mutex && tdb_runtime_check_for_robust_mutexes()) {
 114                         tdb_flags |= TDB_MUTEX_LOCKING;
 115                 }
 116
 117                 require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
 118                                            "*", require_mutex);
 119                 require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
 120                                            base, require_mutex);
 121
 122                 if (require_mutex) {
 123                         tdb_flags |= TDB_MUTEX_LOCKING;
 124                 }
 125         }
 126
 127         sockname = lp_ctdbd_socket();
 128
 129         if (lp_clustering()) {
 130                 const char *partname;
 131
 132                 if (!socket_exist(sockname)) {
 133                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
 134                                   "running?\n"));
 135                         return NULL;
 136                 }
 137
 138                 /* ctdb only wants the file part of the name */
 139                 partname = strrchr(name, '/');
 140                 if (partname) {
 141                         partname++;
 142                 } else {
 143                         partname = name;
 144                 }
 145                 /* allow ctdb for individual databases to be disabled */
 146                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 147                         struct ctdbd_connection *conn;
 148
 149                         conn = messaging_ctdbd_connection();
 150                         if (conn == NULL) {
 151                                 DBG_WARNING("No ctdb connection\n");
 152                                 errno = EIO;
 153                                 return NULL;
 154                         }
 155                         result = db_open_ctdb(mem_ctx, conn, partname,
 156                                               hash_size,
 157                                               tdb_flags, open_flags, mode,
 158                                               lock_order, dbwrap_flags);
 159                         if (result == NULL) {
 160                                 DEBUG(0,("failed to attach to ctdb %s\n",
 161                                          partname));
 162                                 if (errno == 0) {
 163                                         errno = EIO;
 164                                 }
 165                                 return NULL;
 166                         }
 167                 }
 168         }
 169
 170         if (result == NULL) {
 171                 struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
 172                 result = dbwrap_local_open(mem_ctx, lp_ctx, name, hash_size,
 173                                            tdb_flags, open_flags, mode,
 174                                            lock_order, dbwrap_flags);
 175                 talloc_unlink(mem_ctx, lp_ctx);
 176         }
 177         return result;
 178 }