1 /* Copyright (c) 2009 Nicira Networks
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 #include "transaction.h"
25 #include "ovsdb-error.h"
33 struct hmap txn_tables; /* Contains "struct ovsdb_txn_table"s. */
36 /* A table modified by a transaction. */
37 struct ovsdb_txn_table {
38 struct hmap_node hmap_node; /* Element in ovsdb_txn's txn_tables hmap. */
39 struct ovsdb_table *table;
40 struct hmap txn_rows; /* Contains "struct ovsdb_txn_row"s. */
43 /* A row modified by the transaction:
45 * - A row added by a transaction will have null 'old' and non-null 'new'.
47 * - A row deleted by a transaction will have non-null 'old' and null
50 * - A row modified by a transaction will have non-null 'old' and 'new'.
52 * - 'old' and 'new' both null is invalid. It would indicate that a row
53 * was added then deleted within a single transaction, but we instead
54 * handle that case by deleting the txn_row entirely.
56 struct ovsdb_txn_row {
57 struct hmap_node hmap_node; /* In ovsdb_txn_table's txn_rows hmap. */
58 struct ovsdb_row *old; /* The old row. */
59 struct ovsdb_row *new; /* The new row. */
63 ovsdb_txn_create(struct ovsdb *db)
65 struct ovsdb_txn *txn = xmalloc(sizeof *txn);
67 hmap_init(&txn->txn_tables);
72 ovsdb_txn_destroy(struct ovsdb_txn *txn, void (*cb)(struct ovsdb_txn_row *))
74 struct ovsdb_txn_table *txn_table, *next_txn_table;
76 HMAP_FOR_EACH_SAFE (txn_table, next_txn_table,
77 struct ovsdb_txn_table, hmap_node, &txn->txn_tables)
79 struct ovsdb_txn_row *txn_row, *next_txn_row;
81 HMAP_FOR_EACH_SAFE (txn_row, next_txn_row,
82 struct ovsdb_txn_row, hmap_node,
86 txn_row->new->txn_row = NULL;
92 hmap_destroy(&txn_table->txn_rows);
95 hmap_destroy(&txn->txn_tables);
100 ovsdb_txn_row_abort(struct ovsdb_txn_row *txn_row)
102 struct ovsdb_row *old = txn_row->old;
103 struct ovsdb_row *new = txn_row->new;
106 hmap_remove(&new->table->rows, &new->hmap_node);
108 hmap_insert(&old->table->rows, &old->hmap_node, ovsdb_row_hash(old));
110 hmap_replace(&new->table->rows, &new->hmap_node, &old->hmap_node);
112 ovsdb_row_destroy(new);
116 ovsdb_txn_abort(struct ovsdb_txn *txn)
118 ovsdb_txn_destroy(txn, ovsdb_txn_row_abort);
122 ovsdb_txn_row_commit(struct ovsdb_txn_row *txn_row)
124 ovsdb_row_destroy(txn_row->old);
128 ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
130 struct ovsdb_replica *replica;
131 struct ovsdb_error *error;
133 LIST_FOR_EACH (replica, struct ovsdb_replica, node, &txn->db->replicas) {
134 error = (replica->class->commit)(replica, txn, durable);
136 /* We don't support two-phase commit so only the first replica is
137 * allowed to report an error. */
138 assert(&replica->node == txn->db->replicas.next);
140 ovsdb_txn_abort(txn);
145 txn->db->run_triggers = true;
146 ovsdb_txn_destroy(txn, ovsdb_txn_row_commit);
151 ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
152 ovsdb_txn_row_cb_func *cb, void *aux)
154 struct ovsdb_txn_table *t;
155 struct ovsdb_txn_row *r;
157 HMAP_FOR_EACH (t, struct ovsdb_txn_table, hmap_node, &txn->txn_tables) {
158 HMAP_FOR_EACH (r, struct ovsdb_txn_row, hmap_node, &t->txn_rows) {
159 if (!cb(r->old, r->new, aux)) {
166 static struct ovsdb_txn_table *
167 ovsdb_txn_get_txn_table__(struct ovsdb_txn *txn,
168 const struct ovsdb_table *table,
171 struct ovsdb_txn_table *txn_table;
173 HMAP_FOR_EACH_IN_BUCKET (txn_table, struct ovsdb_txn_table, hmap_node,
174 hash, &txn->txn_tables) {
175 if (txn_table->table == table) {
183 static struct ovsdb_txn_table *
184 ovsdb_txn_get_txn_table(struct ovsdb_txn *txn, const struct ovsdb_table *table)
186 return ovsdb_txn_get_txn_table__(txn, table, hash_pointer(table, 0));
189 static struct ovsdb_txn_table *
190 ovsdb_txn_create_txn_table(struct ovsdb_txn *txn,
191 struct ovsdb_table *table)
193 uint32_t hash = hash_pointer(table, 0);
194 struct ovsdb_txn_table *txn_table;
196 txn_table = ovsdb_txn_get_txn_table__(txn, table, hash);
198 txn_table = xmalloc(sizeof *txn_table);
199 txn_table->table = table;
200 hmap_init(&txn_table->txn_rows);
201 hmap_insert(&txn->txn_tables, &txn_table->hmap_node, hash);
206 static struct ovsdb_txn_row *
207 ovsdb_txn_row_create(struct ovsdb_txn_table *txn_table,
208 const struct ovsdb_row *old, struct ovsdb_row *new)
210 uint32_t hash = ovsdb_row_hash(old ? old : new);
211 struct ovsdb_txn_row *txn_row;
213 txn_row = xmalloc(sizeof *txn_row);
214 txn_row->old = (struct ovsdb_row *) old;
216 hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node, hash);
222 ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
224 struct ovsdb_row *ro_row = (struct ovsdb_row *) ro_row_;
226 if (ro_row->txn_row) {
227 assert(ro_row == ro_row->txn_row->new);
230 struct ovsdb_table *table = ro_row->table;
231 struct ovsdb_txn_table *txn_table;
232 struct ovsdb_row *rw_row;
234 txn_table = ovsdb_txn_create_txn_table(txn, table);
235 rw_row = ovsdb_row_clone(ro_row);
236 uuid_generate(ovsdb_row_get_version_rw(rw_row));
237 rw_row->txn_row = ovsdb_txn_row_create(txn_table, ro_row, rw_row);
238 hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
245 ovsdb_txn_row_insert(struct ovsdb_txn *txn, struct ovsdb_row *row)
247 uint32_t hash = ovsdb_row_hash(row);
248 struct ovsdb_table *table = row->table;
249 struct ovsdb_txn_table *txn_table;
251 uuid_generate(ovsdb_row_get_version_rw(row));
253 txn_table = ovsdb_txn_create_txn_table(txn, table);
254 row->txn_row = ovsdb_txn_row_create(txn_table, NULL, row);
255 hmap_insert(&table->rows, &row->hmap_node, hash);
258 /* 'row' must be assumed destroyed upon return; the caller must not reference
261 ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
263 struct ovsdb_row *row = (struct ovsdb_row *) row_;
264 struct ovsdb_table *table = row->table;
265 struct ovsdb_txn_row *txn_row = row->txn_row;
266 struct ovsdb_txn_table *txn_table;
268 hmap_remove(&table->rows, &row->hmap_node);
271 txn_table = ovsdb_txn_create_txn_table(txn, table);
272 row->txn_row = ovsdb_txn_row_create(txn_table, row, NULL);
274 assert(txn_row->new == row);
278 txn_table = ovsdb_txn_get_txn_table(txn, table);
279 hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
281 ovsdb_row_destroy(row);