Line data Source code
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 "lib/messages_ctdb.h"
30 : #include "util_tdb.h"
31 : #include "ctdbd_conn.h"
32 : #include "global_contexts.h"
33 :
34 57 : bool db_is_local(const char *name)
35 : {
36 57 : const char *sockname = lp_ctdbd_socket();
37 :
38 57 : if (lp_clustering() && socket_exist(sockname)) {
39 0 : const char *partname;
40 : /* ctdb only wants the file part of the name */
41 0 : partname = strrchr(name, '/');
42 0 : if (partname) {
43 0 : partname++;
44 : } else {
45 0 : partname = name;
46 : }
47 : /* allow ctdb for individual databases to be disabled */
48 0 : if (lp_parm_bool(-1, "ctdb", partname, True)) {
49 0 : return false;
50 : }
51 : }
52 :
53 55 : return true;
54 : }
55 :
56 : /**
57 : * open a database
58 : */
59 96897 : 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 96897 : struct db_context *result = NULL;
67 1020 : const char *base;
68 96897 : struct loadparm_context *lp_ctx = NULL;
69 :
70 96897 : if ((lock_order != DBWRAP_LOCK_ORDER_NONE) &&
71 95682 : !DBWRAP_LOCK_ORDER_VALID(lock_order)) {
72 0 : errno = EINVAL;
73 0 : return NULL;
74 : }
75 :
76 96897 : base = strrchr_m(name, '/');
77 96897 : if (base != NULL) {
78 96891 : base++;
79 : } else {
80 0 : base = name;
81 : }
82 :
83 96897 : if (tdb_flags & TDB_CLEAR_IF_FIRST) {
84 786 : bool try_readonly = false;
85 :
86 786 : if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
87 168 : try_readonly = true;
88 : }
89 :
90 786 : try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
91 786 : try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
92 :
93 786 : if (try_readonly) {
94 168 : dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
95 : } else {
96 618 : dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
97 : }
98 : }
99 :
100 96897 : if (tdb_flags & TDB_CLEAR_IF_FIRST) {
101 786 : bool try_mutex = true;
102 786 : bool require_mutex = false;
103 :
104 786 : try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", "*", try_mutex);
105 786 : try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", base, try_mutex);
106 :
107 786 : if (!lp_use_mmap()) {
108 : /*
109 : * Mutexes require mmap. "use mmap = no" can
110 : * be a debugging tool, so let it override the
111 : * mutex parameters
112 : */
113 0 : try_mutex = false;
114 : }
115 :
116 786 : if (try_mutex && tdb_runtime_check_for_robust_mutexes()) {
117 786 : tdb_flags |= TDB_MUTEX_LOCKING;
118 : }
119 :
120 786 : require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
121 : "*", require_mutex);
122 786 : require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
123 : base, require_mutex);
124 :
125 786 : if (require_mutex) {
126 163 : tdb_flags |= TDB_MUTEX_LOCKING;
127 : }
128 : }
129 :
130 96897 : if (lp_clustering()) {
131 0 : const char *sockname;
132 :
133 0 : sockname = lp_ctdbd_socket();
134 0 : if (!socket_exist(sockname)) {
135 0 : DBG_WARNING("ctdb socket does %s not exist - "
136 : "is ctdb not running?\n",
137 : sockname);
138 0 : return NULL;
139 : }
140 :
141 : /* allow ctdb for individual databases to be disabled */
142 0 : if (lp_parm_bool(-1, "ctdb", base, true)) {
143 0 : struct messaging_context *msg_ctx;
144 0 : struct ctdbd_connection *conn;
145 :
146 : /*
147 : * Initialize messaging before getting the ctdb
148 : * connection, as the ctdb connection requires messaging
149 : * to be initialized.
150 : */
151 0 : msg_ctx = global_messaging_context();
152 0 : if (msg_ctx == NULL) {
153 0 : DBG_ERR("Failed to initialize messaging\n");
154 0 : return NULL;
155 : }
156 :
157 0 : conn = messaging_ctdb_connection();
158 0 : if (conn == NULL) {
159 0 : DBG_WARNING("No ctdb connection\n");
160 0 : errno = EIO;
161 0 : return NULL;
162 : }
163 :
164 0 : result = db_open_ctdb(mem_ctx, msg_ctx, base,
165 : hash_size,
166 : tdb_flags, open_flags, mode,
167 : lock_order, dbwrap_flags);
168 0 : if (result == NULL) {
169 0 : DBG_ERR("failed to attach to ctdb %s\n", base);
170 0 : if (errno == 0) {
171 0 : errno = EIO;
172 : }
173 0 : return NULL;
174 : }
175 :
176 0 : return result;
177 : }
178 : }
179 :
180 96897 : lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
181 :
182 96897 : if (hash_size == 0) {
183 96454 : hash_size = lpcfg_tdb_hash_size(lp_ctx, name);
184 : }
185 96897 : tdb_flags = lpcfg_tdb_flags(lp_ctx, tdb_flags);
186 :
187 96897 : result = dbwrap_local_open(mem_ctx,
188 : name,
189 : hash_size,
190 : tdb_flags,
191 : open_flags,
192 : mode,
193 : lock_order,
194 : dbwrap_flags);
195 96897 : talloc_unlink(mem_ctx, lp_ctx);
196 96897 : return result;
197 : }
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