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->old->txn_row = NULL;
89 txn_row->new->txn_row = NULL;
95 hmap_destroy(&txn_table->txn_rows);
98 hmap_destroy(&txn->txn_tables);
103 ovsdb_txn_row_abort(struct ovsdb_txn_row *txn_row)
105 struct ovsdb_row *old = txn_row->old;
106 struct ovsdb_row *new = txn_row->new;
109 hmap_remove(&new->table->rows, &new->hmap_node);
111 hmap_insert(&old->table->rows, &old->hmap_node, ovsdb_row_hash(old));
113 hmap_replace(&new->table->rows, &new->hmap_node, &old->hmap_node);
115 ovsdb_row_destroy(new);
119 ovsdb_txn_abort(struct ovsdb_txn *txn)
121 ovsdb_txn_destroy(txn, ovsdb_txn_row_abort);
125 ovsdb_txn_row_commit(struct ovsdb_txn_row *txn_row)
127 ovsdb_row_destroy(txn_row->old);
131 ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
133 struct ovsdb_replica *replica;
134 struct ovsdb_error *error;
136 LIST_FOR_EACH (replica, struct ovsdb_replica, node, &txn->db->replicas) {
137 error = (replica->class->commit)(replica, txn, durable);
139 /* We don't support two-phase commit so only the first replica is
140 * allowed to report an error. */
141 assert(&replica->node == txn->db->replicas.next);
143 ovsdb_txn_abort(txn);
148 txn->db->run_triggers = true;
149 ovsdb_txn_destroy(txn, ovsdb_txn_row_commit);
154 ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
155 ovsdb_txn_row_cb_func *cb, void *aux)
157 struct ovsdb_txn_table *t;
158 struct ovsdb_txn_row *r;
160 HMAP_FOR_EACH (t, struct ovsdb_txn_table, hmap_node, &txn->txn_tables) {
161 HMAP_FOR_EACH (r, struct ovsdb_txn_row, hmap_node, &t->txn_rows) {
162 if (!cb(r->old, r->new, aux)) {
169 static struct ovsdb_txn_table *
170 ovsdb_txn_get_txn_table__(struct ovsdb_txn *txn,
171 const struct ovsdb_table *table,
174 struct ovsdb_txn_table *txn_table;
176 HMAP_FOR_EACH_IN_BUCKET (txn_table, struct ovsdb_txn_table, hmap_node,
177 hash, &txn->txn_tables) {
178 if (txn_table->table == table) {
186 static struct ovsdb_txn_table *
187 ovsdb_txn_get_txn_table(struct ovsdb_txn *txn, const struct ovsdb_table *table)
189 return ovsdb_txn_get_txn_table__(txn, table, hash_pointer(table, 0));
192 static struct ovsdb_txn_table *
193 ovsdb_txn_create_txn_table(struct ovsdb_txn *txn,
194 struct ovsdb_table *table)
196 uint32_t hash = hash_pointer(table, 0);
197 struct ovsdb_txn_table *txn_table;
199 txn_table = ovsdb_txn_get_txn_table__(txn, table, hash);
201 txn_table = xmalloc(sizeof *txn_table);
202 txn_table->table = table;
203 hmap_init(&txn_table->txn_rows);
204 hmap_insert(&txn->txn_tables, &txn_table->hmap_node, hash);
209 static struct ovsdb_txn_row *
210 ovsdb_txn_row_create(struct ovsdb_txn_table *txn_table,
211 const struct ovsdb_row *old, struct ovsdb_row *new)
213 uint32_t hash = ovsdb_row_hash(old ? old : new);
214 struct ovsdb_txn_row *txn_row;
216 txn_row = xmalloc(sizeof *txn_row);
217 txn_row->old = (struct ovsdb_row *) old;
219 hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node, hash);
225 ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
227 struct ovsdb_row *ro_row = (struct ovsdb_row *) ro_row_;
229 if (ro_row->txn_row) {
230 assert(ro_row == ro_row->txn_row->new);
233 struct ovsdb_table *table = ro_row->table;
234 struct ovsdb_txn_table *txn_table;
235 struct ovsdb_row *rw_row;
237 txn_table = ovsdb_txn_create_txn_table(txn, table);
238 rw_row = ovsdb_row_clone(ro_row);
239 uuid_generate(ovsdb_row_get_version_rw(rw_row));
240 rw_row->txn_row = ovsdb_txn_row_create(txn_table, ro_row, rw_row);
241 hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
248 ovsdb_txn_row_insert(struct ovsdb_txn *txn, struct ovsdb_row *row)
250 uint32_t hash = ovsdb_row_hash(row);
251 struct ovsdb_table *table = row->table;
252 struct ovsdb_txn_table *txn_table;
254 uuid_generate(ovsdb_row_get_version_rw(row));
256 txn_table = ovsdb_txn_create_txn_table(txn, table);
257 row->txn_row = ovsdb_txn_row_create(txn_table, NULL, row);
258 hmap_insert(&table->rows, &row->hmap_node, hash);
261 /* 'row' must be assumed destroyed upon return; the caller must not reference
264 ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
266 struct ovsdb_row *row = (struct ovsdb_row *) row_;
267 struct ovsdb_table *table = row->table;
268 struct ovsdb_txn_row *txn_row = row->txn_row;
269 struct ovsdb_txn_table *txn_table;
271 hmap_remove(&table->rows, &row->hmap_node);
274 txn_table = ovsdb_txn_create_txn_table(txn, table);
275 row->txn_row = ovsdb_txn_row_create(txn_table, row, NULL);
277 assert(txn_row->new == row);
281 txn_table = ovsdb_txn_get_txn_table(txn, table);
282 hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
284 ovsdb_row_destroy(row);