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         const char *sockname = lp_ctdbd_socket();
  34
  35         if (lp_clustering() && socket_exist(sockname)) {
  36                 const char *partname;
  37                 /* ctdb only wants the file part of the name */
  38                 partname = strrchr(name, '/');
  39                 if (partname) {
  40                         partname++;
  41                 } else {
  42                         partname = name;
  43                 }
  44                 /* allow ctdb for individual databases to be disabled */
  45                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  46                         return false;
  47                 }
  48         }
  49
  50         return true;
  51 }
  52
  53 /**
  54  * open a database
  55  */
  56 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  57                            const char *name,
  58                            int hash_size, int tdb_flags,
  59                            int open_flags, mode_t mode,
  60                            enum dbwrap_lock_order lock_order,
  61                            uint64_t dbwrap_flags)
  62 {
  63         struct db_context *result = NULL;
  64         const char *sockname;
  65
  66         if (!DBWRAP_LOCK_ORDER_VALID(lock_order)) {
  67                 errno = EINVAL;
  68                 return NULL;
  69         }
  70
  71         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  72                 const char *base;
  73                 bool try_readonly = false;
  74
  75                 base = strrchr_m(name, '/');
  76                 if (base != NULL) {
  77                         base += 1;
  78                 } else {
  79                         base = name;
  80                 }
  81
  82                 if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
  83                         try_readonly = true;
  84                 }
  85
  86                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
  87                 try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
  88
  89                 if (try_readonly) {
  90                         dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  91                 } else {
  92                         dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
  93                 }
  94         }
  95
  96         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
  97                 const char *base;
  98                 bool try_mutex = false;
  99
 100                 base = strrchr_m(name, '/');
 101                 if (base != NULL) {
 102                         base += 1;
 103                 } else {
 104                         base = name;
 105                 }
 106
 107                 try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", "*", try_mutex);
 108                 try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", base, try_mutex);
 109
 110                 if (try_mutex && tdb_runtime_check_for_robust_mutexes()) {
 111                         tdb_flags |= TDB_MUTEX_LOCKING;
 112                 }
 113         }
 114
 115         sockname = lp_ctdbd_socket();
 116
 117         if (lp_clustering()) {
 118                 const char *partname;
 119
 120                 if (!socket_exist(sockname)) {
 121                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
 122                                   "running?\n"));
 123                         return NULL;
 124                 }
 125
 126                 /* ctdb only wants the file part of the name */
 127                 partname = strrchr(name, '/');
 128                 if (partname) {
 129                         partname++;
 130                 } else {
 131                         partname = name;
 132                 }
 133                 /* allow ctdb for individual databases to be disabled */
 134                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 135                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 136                                               tdb_flags, open_flags, mode,
 137                                               lock_order, dbwrap_flags);
 138                         if (result == NULL) {
 139                                 DEBUG(0,("failed to attach to ctdb %s\n",
 140                                          partname));
 141                                 if (errno == 0) {
 142                                         errno = EIO;
 143                                 }
 144                                 return NULL;
 145                         }
 146                 }
 147         }
 148
 149         if (result == NULL) {
 150                 struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
 151                 result = dbwrap_local_open(mem_ctx, lp_ctx, name, hash_size,
 152                                            tdb_flags, open_flags, mode,
 153                                            lock_order, dbwrap_flags);
 154                 talloc_unlink(mem_ctx, lp_ctx);
 155         }
 156         return result;
 157 }