1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
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"
21 #include "openvswitch/dynamic-string.h"
23 #include "openvswitch/hmap.h"
24 #include "openvswitch/json.h"
25 #include "openvswitch/list.h"
26 #include "ovsdb-error.h"
30 #include "perf-counter.h"
35 struct ovs_list txn_tables; /* Contains "struct ovsdb_txn_table"s. */
39 /* A table modified by a transaction. */
40 struct ovsdb_txn_table {
41 struct ovs_list node; /* Element in ovsdb_txn's txn_tables list. */
42 struct ovsdb_table *table;
43 struct hmap txn_rows; /* Contains "struct ovsdb_txn_row"s. */
45 /* This has the same form as the 'indexes' member of struct ovsdb_table,
46 * but it is only used or updated at transaction commit time, from
47 * check_index_uniqueness(). */
48 struct hmap *txn_indexes;
50 /* Used by for_each_txn_row(). */
51 unsigned int serial; /* Serial number of in-progress iteration. */
52 unsigned int n_processed; /* Number of rows processed. */
55 /* A row modified by the transaction:
57 * - A row added by a transaction will have null 'old' and non-null 'new'.
59 * - A row deleted by a transaction will have non-null 'old' and null
62 * - A row modified by a transaction will have non-null 'old' and 'new'.
64 * - 'old' and 'new' both null indicates that a row was added then deleted
65 * within a single transaction. Most of the time we instead delete the
66 * ovsdb_txn_row entirely, but inside a for_each_txn_row() callback
67 * there are restrictions that sometimes mean we have to leave the
68 * ovsdb_txn_row in place.
70 struct ovsdb_txn_row {
71 struct hmap_node hmap_node; /* In ovsdb_txn_table's txn_rows hmap. */
72 struct ovsdb_row *old; /* The old row. */
73 struct ovsdb_row *new; /* The new row. */
74 size_t n_refs; /* Number of remaining references. */
76 /* These members are the same as the corresponding members of 'old' or
77 * 'new'. They are present here for convenience and because occasionally
78 * there can be an ovsdb_txn_row where both 'old' and 'new' are NULL. */
80 struct ovsdb_table *table;
82 /* Used by for_each_txn_row(). */
83 unsigned int serial; /* Serial number of in-progress commit. */
85 unsigned long changed[]; /* Bits set to 1 for columns that changed. */
88 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
89 delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *r);
90 static void ovsdb_txn_row_prefree(struct ovsdb_txn_row *);
91 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
92 for_each_txn_row(struct ovsdb_txn *txn,
93 struct ovsdb_error *(*)(struct ovsdb_txn *,
94 struct ovsdb_txn_row *));
96 /* Used by for_each_txn_row() to track tables and rows that have been
98 static unsigned int serial;
101 ovsdb_txn_create(struct ovsdb *db)
103 struct ovsdb_txn *txn = xmalloc(sizeof *txn);
105 ovs_list_init(&txn->txn_tables);
106 ds_init(&txn->comment);
111 ovsdb_txn_free(struct ovsdb_txn *txn)
113 ovs_assert(ovs_list_is_empty(&txn->txn_tables));
114 ds_destroy(&txn->comment);
118 static struct ovsdb_error *
119 ovsdb_txn_row_abort(struct ovsdb_txn *txn OVS_UNUSED,
120 struct ovsdb_txn_row *txn_row)
122 struct ovsdb_row *old = txn_row->old;
123 struct ovsdb_row *new = txn_row->new;
125 ovsdb_txn_row_prefree(txn_row);
128 hmap_remove(&new->table->rows, &new->hmap_node);
131 hmap_insert(&old->table->rows, &old->hmap_node, ovsdb_row_hash(old));
133 hmap_replace(&new->table->rows, &new->hmap_node, &old->hmap_node);
135 ovsdb_row_destroy(new);
141 /* Returns the offset in bytes from the start of an ovsdb_row for 'table' to
142 * the hmap_node for the index numbered 'i'. */
144 ovsdb_row_index_offset__(const struct ovsdb_table *table, size_t i)
146 size_t n_fields = shash_count(&table->schema->columns);
147 return (offsetof(struct ovsdb_row, fields)
148 + n_fields * sizeof(struct ovsdb_datum)
149 + i * sizeof(struct hmap_node));
152 /* Returns the hmap_node in 'row' for the index numbered 'i'. */
153 static struct hmap_node *
154 ovsdb_row_get_index_node(struct ovsdb_row *row, size_t i)
156 return (void *) ((char *) row + ovsdb_row_index_offset__(row->table, i));
159 /* Returns the ovsdb_row given 'index_node', which is a pointer to that row's
160 * hmap_node for the index numbered 'i' within 'table'. */
161 static struct ovsdb_row *
162 ovsdb_row_from_index_node(struct hmap_node *index_node,
163 const struct ovsdb_table *table, size_t i)
165 return (void *) ((char *) index_node - ovsdb_row_index_offset__(table, i));
169 ovsdb_txn_abort(struct ovsdb_txn *txn)
171 ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_abort));
175 static struct ovsdb_txn_row *
176 find_txn_row(const struct ovsdb_table *table, const struct uuid *uuid)
178 struct ovsdb_txn_row *txn_row;
180 if (!table->txn_table) {
184 HMAP_FOR_EACH_WITH_HASH (txn_row, hmap_node,
185 uuid_hash(uuid), &table->txn_table->txn_rows) {
186 if (uuid_equals(uuid, &txn_row->uuid)) {
194 static struct ovsdb_txn_row *
195 find_or_make_txn_row(struct ovsdb_txn *txn, const struct ovsdb_table *table,
196 const struct uuid *uuid)
198 struct ovsdb_txn_row *txn_row = find_txn_row(table, uuid);
200 const struct ovsdb_row *row = ovsdb_table_get_row(table, uuid);
202 txn_row = ovsdb_txn_row_modify(txn, row)->txn_row;
208 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
209 ovsdb_txn_adjust_atom_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
210 const struct ovsdb_column *c,
211 const struct ovsdb_base_type *base,
212 const union ovsdb_atom *atoms, unsigned int n,
215 const struct ovsdb_table *table;
218 if (!ovsdb_base_type_is_strong_ref(base)) {
222 table = base->u.uuid.refTable;
223 for (i = 0; i < n; i++) {
224 const struct uuid *uuid = &atoms[i].uuid;
225 struct ovsdb_txn_row *txn_row;
227 if (uuid_equals(uuid, ovsdb_row_get_uuid(r))) {
228 /* Self-references don't count. */
232 txn_row = find_or_make_txn_row(txn, table, uuid);
234 return ovsdb_error("referential integrity violation",
235 "Table %s column %s row "UUID_FMT" "
236 "references nonexistent row "UUID_FMT" in "
238 r->table->schema->name, c->name,
239 UUID_ARGS(ovsdb_row_get_uuid(r)),
240 UUID_ARGS(uuid), table->schema->name);
242 txn_row->n_refs += delta;
248 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
249 ovsdb_txn_adjust_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
250 const struct ovsdb_column *column, int delta)
252 const struct ovsdb_datum *field = &r->fields[column->index];
253 struct ovsdb_error *error;
255 error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.key,
256 field->keys, field->n, delta);
258 error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.value,
259 field->values, field->n, delta);
264 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
265 update_row_ref_count(struct ovsdb_txn *txn, struct ovsdb_txn_row *r)
267 struct ovsdb_table *table = r->table;
268 struct shash_node *node;
270 SHASH_FOR_EACH (node, &table->schema->columns) {
271 const struct ovsdb_column *column = node->data;
272 struct ovsdb_error *error;
274 if (bitmap_is_set(r->changed, column->index)) {
276 error = ovsdb_txn_adjust_row_refs(txn, r->old, column, -1);
278 return OVSDB_WRAP_BUG("error decreasing refcount", error);
282 error = ovsdb_txn_adjust_row_refs(txn, r->new, column, 1);
293 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
294 check_ref_count(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *r)
296 if (r->new || !r->n_refs) {
299 return ovsdb_error("referential integrity violation",
300 "cannot delete %s row "UUID_FMT" because "
301 "of %"PRIuSIZE" remaining reference(s)",
302 r->table->schema->name, UUID_ARGS(&r->uuid),
307 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
308 delete_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *row,
309 const struct ovsdb_base_type *base,
310 const union ovsdb_atom *atoms, unsigned int n)
312 const struct ovsdb_table *table;
315 if (!ovsdb_base_type_is_strong_ref(base)) {
319 table = base->u.uuid.refTable;
320 for (i = 0; i < n; i++) {
321 const struct uuid *uuid = &atoms[i].uuid;
322 struct ovsdb_txn_row *txn_row;
324 if (uuid_equals(uuid, ovsdb_row_get_uuid(row))) {
325 /* Self-references don't count. */
329 txn_row = find_or_make_txn_row(txn, table, uuid);
331 return OVSDB_BUG("strong ref target missing");
332 } else if (!txn_row->n_refs) {
333 return OVSDB_BUG("strong ref target has zero n_refs");
334 } else if (!txn_row->new) {
335 return OVSDB_BUG("deleted strong ref target");
338 if (--txn_row->n_refs == 0) {
339 struct ovsdb_error *error = delete_garbage_row(txn, txn_row);
349 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
350 delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
352 struct shash_node *node;
353 struct ovsdb_row *row;
355 if (txn_row->table->schema->is_root) {
361 hmap_remove(&txn_row->table->rows, &row->hmap_node);
362 SHASH_FOR_EACH (node, &txn_row->table->schema->columns) {
363 const struct ovsdb_column *column = node->data;
364 const struct ovsdb_datum *field = &row->fields[column->index];
365 struct ovsdb_error *error;
367 error = delete_row_refs(txn, row,
368 &column->type.key, field->keys, field->n);
373 error = delete_row_refs(txn, row,
374 &column->type.value, field->values, field->n);
379 ovsdb_row_destroy(row);
384 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
385 collect_garbage(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
387 if (txn_row->new && !txn_row->n_refs) {
388 return delete_garbage_row(txn, txn_row);
393 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
394 update_ref_counts(struct ovsdb_txn *txn)
396 struct ovsdb_error *error;
398 error = for_each_txn_row(txn, update_row_ref_count);
403 return for_each_txn_row(txn, check_ref_count);
406 static struct ovsdb_error *
407 ovsdb_txn_row_commit(struct ovsdb_txn *txn OVS_UNUSED,
408 struct ovsdb_txn_row *txn_row)
410 size_t n_indexes = txn_row->table->schema->n_indexes;
415 for (i = 0; i < n_indexes; i++) {
416 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->old, i);
417 hmap_remove(&txn_row->table->indexes[i], node);
423 for (i = 0; i < n_indexes; i++) {
424 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->new, i);
425 hmap_insert(&txn_row->table->indexes[i], node, node->hash);
429 ovsdb_txn_row_prefree(txn_row);
431 txn_row->new->n_refs = txn_row->n_refs;
433 ovsdb_row_destroy(txn_row->old);
440 add_weak_ref(struct ovsdb_txn *txn,
441 const struct ovsdb_row *src_, const struct ovsdb_row *dst_)
443 struct ovsdb_row *src = CONST_CAST(struct ovsdb_row *, src_);
444 struct ovsdb_row *dst = CONST_CAST(struct ovsdb_row *, dst_);
445 struct ovsdb_weak_ref *weak;
451 dst = ovsdb_txn_row_modify(txn, dst);
453 if (!ovs_list_is_empty(&dst->dst_refs)) {
454 /* Omit duplicates. */
455 weak = CONTAINER_OF(ovs_list_back(&dst->dst_refs),
456 struct ovsdb_weak_ref, dst_node);
457 if (weak->src == src) {
462 weak = xmalloc(sizeof *weak);
464 ovs_list_push_back(&dst->dst_refs, &weak->dst_node);
465 ovs_list_push_back(&src->src_refs, &weak->src_node);
468 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
469 assess_weak_refs(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
471 struct ovsdb_table *table;
472 struct shash_node *node;
475 /* Mark rows that have weak references to 'txn_row' as modified, so
476 * that their weak references will get reassessed. */
477 struct ovsdb_weak_ref *weak, *next;
479 LIST_FOR_EACH_SAFE (weak, next, dst_node, &txn_row->old->dst_refs) {
480 if (!weak->src->txn_row) {
481 ovsdb_txn_row_modify(txn, weak->src);
487 /* We don't have to do anything about references that originate at
488 * 'txn_row', because ovsdb_row_destroy() will remove those weak
493 table = txn_row->table;
494 SHASH_FOR_EACH (node, &table->schema->columns) {
495 const struct ovsdb_column *column = node->data;
496 struct ovsdb_datum *datum = &txn_row->new->fields[column->index];
497 unsigned int orig_n, i;
502 if (ovsdb_base_type_is_weak_ref(&column->type.key)) {
503 for (i = 0; i < datum->n; ) {
504 const struct ovsdb_row *row;
506 row = ovsdb_table_get_row(column->type.key.u.uuid.refTable,
507 &datum->keys[i].uuid);
509 add_weak_ref(txn, txn_row->new, row);
512 if (uuid_is_zero(&datum->keys[i].uuid)) {
515 ovsdb_datum_remove_unsafe(datum, i, &column->type);
520 if (ovsdb_base_type_is_weak_ref(&column->type.value)) {
521 for (i = 0; i < datum->n; ) {
522 const struct ovsdb_row *row;
524 row = ovsdb_table_get_row(column->type.value.u.uuid.refTable,
525 &datum->values[i].uuid);
527 add_weak_ref(txn, txn_row->new, row);
530 if (uuid_is_zero(&datum->values[i].uuid)) {
533 ovsdb_datum_remove_unsafe(datum, i, &column->type);
538 if (datum->n != orig_n) {
539 bitmap_set1(txn_row->changed, column->index);
540 ovsdb_datum_sort_assert(datum, column->type.key.type);
541 if (datum->n < column->type.n_min) {
542 const struct uuid *row_uuid = ovsdb_row_get_uuid(txn_row->new);
543 if (zero && !txn_row->old) {
545 "constraint violation",
546 "Weak reference column \"%s\" in \"%s\" row "UUID_FMT
547 " (inserted within this transaction) contained "
548 "all-zeros UUID (probably as the default value for "
549 "this column) but deleting this value caused a "
550 "constraint volation because this column is not "
551 "allowed to be empty.", column->name,
552 table->schema->name, UUID_ARGS(row_uuid));
555 "constraint violation",
556 "Deletion of %u weak reference(s) to deleted (or "
557 "never-existing) rows from column \"%s\" in \"%s\" "
558 "row "UUID_FMT" %scaused this column to become empty, "
559 "but constraints on this column disallow an "
561 orig_n - datum->n, column->name, table->schema->name,
565 : "(inserted within this transaction) "));
574 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
575 determine_changes(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
577 struct ovsdb_table *table = txn_row->table;
579 if (txn_row->old && txn_row->new) {
580 struct shash_node *node;
581 bool changed = false;
583 SHASH_FOR_EACH (node, &table->schema->columns) {
584 const struct ovsdb_column *column = node->data;
585 const struct ovsdb_type *type = &column->type;
586 unsigned int idx = column->index;
588 if (!ovsdb_datum_equals(&txn_row->old->fields[idx],
589 &txn_row->new->fields[idx],
591 bitmap_set1(txn_row->changed, idx);
597 /* Nothing actually changed in this row, so drop it. */
598 ovsdb_txn_row_abort(txn, txn_row);
601 bitmap_set_multiple(txn_row->changed, 0,
602 shash_count(&table->schema->columns), 1);
608 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
609 check_max_rows(struct ovsdb_txn *txn)
611 struct ovsdb_txn_table *t;
613 LIST_FOR_EACH (t, node, &txn->txn_tables) {
614 size_t n_rows = hmap_count(&t->table->rows);
615 unsigned int max_rows = t->table->schema->max_rows;
617 if (n_rows > max_rows) {
618 return ovsdb_error("constraint violation",
619 "transaction causes \"%s\" table to contain "
620 "%"PRIuSIZE" rows, greater than the schema-defined "
621 "limit of %u row(s)",
622 t->table->schema->name, n_rows, max_rows);
629 static struct ovsdb_row *
630 ovsdb_index_search(struct hmap *index, struct ovsdb_row *row, size_t i,
633 const struct ovsdb_table *table = row->table;
634 const struct ovsdb_column_set *columns = &table->schema->indexes[i];
635 struct hmap_node *node;
637 for (node = hmap_first_with_hash(index, hash); node;
638 node = hmap_next_with_hash(node)) {
639 struct ovsdb_row *irow = ovsdb_row_from_index_node(node, table, i);
640 if (ovsdb_row_equal_columns(row, irow, columns)) {
649 duplicate_index_row__(const struct ovsdb_column_set *index,
650 const struct ovsdb_row *row,
654 size_t n_columns = shash_count(&row->table->schema->columns);
656 ds_put_format(out, "%s row, with UUID "UUID_FMT", ",
657 title, UUID_ARGS(ovsdb_row_get_uuid(row)));
659 || bitmap_scan(row->txn_row->changed, 1, 0, n_columns) == n_columns) {
660 ds_put_cstr(out, "existed in the database before this "
661 "transaction and was not modified by the transaction.");
662 } else if (!row->txn_row->old) {
663 ds_put_cstr(out, "was inserted by this transaction.");
664 } else if (ovsdb_row_equal_columns(row->txn_row->old,
665 row->txn_row->new, index)) {
666 ds_put_cstr(out, "existed in the database before this "
667 "transaction, which modified some of the row's columns "
668 "but not any columns in this index.");
670 ds_put_cstr(out, "had the following index values before the "
672 ovsdb_row_columns_to_string(row->txn_row->old, index, out);
673 ds_put_char(out, '.');
677 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
678 duplicate_index_row(const struct ovsdb_column_set *index,
679 const struct ovsdb_row *a,
680 const struct ovsdb_row *b)
682 struct ovsdb_column_set all_columns;
683 struct ovsdb_error *error;
687 /* Put 'a' and 'b' in a predictable order to make error messages
688 * reproducible for testing. */
689 ovsdb_column_set_init(&all_columns);
690 ovsdb_column_set_add_all(&all_columns, a->table);
691 if (ovsdb_row_compare_columns_3way(a, b, &all_columns) < 0) {
692 const struct ovsdb_row *tmp = a;
696 ovsdb_column_set_destroy(&all_columns);
698 index_s = ovsdb_column_set_to_string(index);
701 ds_put_format(&s, "Transaction causes multiple rows in \"%s\" table to "
702 "have identical values (", a->table->schema->name);
703 ovsdb_row_columns_to_string(a, index, &s);
704 ds_put_format(&s, ") for index on %s. ", index_s);
705 duplicate_index_row__(index, a, "First", &s);
706 ds_put_cstr(&s, " ");
707 duplicate_index_row__(index, b, "Second", &s);
711 error = ovsdb_error("constraint violation", "%s", ds_cstr(&s));
716 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
717 check_index_uniqueness(struct ovsdb_txn *txn OVS_UNUSED,
718 struct ovsdb_txn_row *txn_row)
720 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
721 struct ovsdb_table *table = txn_row->table;
722 struct ovsdb_row *row = txn_row->new;
729 for (i = 0; i < table->schema->n_indexes; i++) {
730 const struct ovsdb_column_set *index = &table->schema->indexes[i];
731 struct ovsdb_row *irow;
734 hash = ovsdb_row_hash_columns(row, index, 0);
735 irow = ovsdb_index_search(&txn_table->txn_indexes[i], row, i, hash);
737 return duplicate_index_row(index, irow, row);
740 irow = ovsdb_index_search(&table->indexes[i], row, i, hash);
741 if (irow && !irow->txn_row) {
742 return duplicate_index_row(index, irow, row);
745 hmap_insert(&txn_table->txn_indexes[i],
746 ovsdb_row_get_index_node(row, i), hash);
752 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
753 update_version(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *txn_row)
755 struct ovsdb_table *table = txn_row->table;
756 size_t n_columns = shash_count(&table->schema->columns);
758 if (txn_row->old && txn_row->new
759 && !bitmap_is_all_zeros(txn_row->changed, n_columns)) {
760 bitmap_set1(txn_row->changed, OVSDB_COL_VERSION);
761 uuid_generate(ovsdb_row_get_version_rw(txn_row->new));
767 static struct ovsdb_error *
768 ovsdb_txn_commit_(struct ovsdb_txn *txn, bool durable)
770 struct ovsdb_replica *replica;
771 struct ovsdb_error *error;
773 /* Figure out what actually changed, and abort early if the transaction
774 * was really a no-op. */
775 error = for_each_txn_row(txn, determine_changes);
777 return OVSDB_WRAP_BUG("can't happen", error);
779 if (ovs_list_is_empty(&txn->txn_tables)) {
780 ovsdb_txn_abort(txn);
784 /* Update reference counts and check referential integrity. */
785 error = update_ref_counts(txn);
787 ovsdb_txn_abort(txn);
791 /* Delete unreferenced, non-root rows. */
792 error = for_each_txn_row(txn, collect_garbage);
794 ovsdb_txn_abort(txn);
795 return OVSDB_WRAP_BUG("can't happen", error);
798 /* Check maximum rows table constraints. */
799 error = check_max_rows(txn);
801 ovsdb_txn_abort(txn);
805 /* Check reference counts and remove bad references for "weak" referential
807 error = for_each_txn_row(txn, assess_weak_refs);
809 ovsdb_txn_abort(txn);
813 /* Verify that the indexes will still be unique post-transaction. */
814 error = for_each_txn_row(txn, check_index_uniqueness);
816 ovsdb_txn_abort(txn);
820 /* Update _version for rows that changed. */
821 error = for_each_txn_row(txn, update_version);
823 return OVSDB_WRAP_BUG("can't happen", error);
826 /* Send the commit to each replica. */
827 LIST_FOR_EACH (replica, node, &txn->db->replicas) {
828 error = (replica->class->commit)(replica, txn, durable);
830 /* We don't support two-phase commit so only the first replica is
831 * allowed to report an error. */
832 ovs_assert(&replica->node == txn->db->replicas.next);
834 ovsdb_txn_abort(txn);
839 /* Finalize commit. */
840 txn->db->run_triggers = true;
841 ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_commit));
848 ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
850 struct ovsdb_error *err;
852 PERF(__func__, err = ovsdb_txn_commit_(txn, durable));
857 ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
858 ovsdb_txn_row_cb_func *cb, void *aux)
860 struct ovsdb_txn_table *t;
861 struct ovsdb_txn_row *r;
863 LIST_FOR_EACH (t, node, &txn->txn_tables) {
864 HMAP_FOR_EACH (r, hmap_node, &t->txn_rows) {
865 if ((r->old || r->new) && !cb(r->old, r->new, r->changed, aux)) {
872 static struct ovsdb_txn_table *
873 ovsdb_txn_create_txn_table(struct ovsdb_txn *txn, struct ovsdb_table *table)
875 if (!table->txn_table) {
876 struct ovsdb_txn_table *txn_table;
879 table->txn_table = txn_table = xmalloc(sizeof *table->txn_table);
880 txn_table->table = table;
881 hmap_init(&txn_table->txn_rows);
882 txn_table->serial = serial - 1;
883 txn_table->txn_indexes = xmalloc(table->schema->n_indexes
884 * sizeof *txn_table->txn_indexes);
885 for (i = 0; i < table->schema->n_indexes; i++) {
886 hmap_init(&txn_table->txn_indexes[i]);
888 ovs_list_push_back(&txn->txn_tables, &txn_table->node);
890 return table->txn_table;
893 static struct ovsdb_txn_row *
894 ovsdb_txn_row_create(struct ovsdb_txn *txn, struct ovsdb_table *table,
895 const struct ovsdb_row *old_, struct ovsdb_row *new)
897 const struct ovsdb_row *row = old_ ? old_ : new;
898 struct ovsdb_row *old = CONST_CAST(struct ovsdb_row *, old_);
899 size_t n_columns = shash_count(&table->schema->columns);
900 struct ovsdb_txn_table *txn_table;
901 struct ovsdb_txn_row *txn_row;
903 txn_row = xzalloc(offsetof(struct ovsdb_txn_row, changed)
904 + bitmap_n_bytes(n_columns));
905 txn_row->uuid = *ovsdb_row_get_uuid(row);
906 txn_row->table = row->table;
909 txn_row->n_refs = old ? old->n_refs : 0;
910 txn_row->serial = serial - 1;
913 old->txn_row = txn_row;
916 new->txn_row = txn_row;
919 txn_table = ovsdb_txn_create_txn_table(txn, table);
920 hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node,
921 ovsdb_row_hash(old ? old : new));
927 ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
929 struct ovsdb_row *ro_row = CONST_CAST(struct ovsdb_row *, ro_row_);
931 if (ro_row->txn_row) {
932 ovs_assert(ro_row == ro_row->txn_row->new);
935 struct ovsdb_table *table = ro_row->table;
936 struct ovsdb_row *rw_row;
938 rw_row = ovsdb_row_clone(ro_row);
939 rw_row->n_refs = ro_row->n_refs;
940 ovsdb_txn_row_create(txn, table, ro_row, rw_row);
941 hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
948 ovsdb_txn_row_insert(struct ovsdb_txn *txn, struct ovsdb_row *row)
950 uint32_t hash = ovsdb_row_hash(row);
951 struct ovsdb_table *table = row->table;
953 uuid_generate(ovsdb_row_get_version_rw(row));
955 ovsdb_txn_row_create(txn, table, NULL, row);
956 hmap_insert(&table->rows, &row->hmap_node, hash);
959 /* 'row' must be assumed destroyed upon return; the caller must not reference
962 ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
964 struct ovsdb_row *row = CONST_CAST(struct ovsdb_row *, row_);
965 struct ovsdb_table *table = row->table;
966 struct ovsdb_txn_row *txn_row = row->txn_row;
968 hmap_remove(&table->rows, &row->hmap_node);
971 ovsdb_txn_row_create(txn, table, row, NULL);
973 ovs_assert(txn_row->new == row);
977 hmap_remove(&table->txn_table->txn_rows, &txn_row->hmap_node);
980 ovsdb_row_destroy(row);
985 ovsdb_txn_add_comment(struct ovsdb_txn *txn, const char *s)
987 if (txn->comment.length) {
988 ds_put_char(&txn->comment, '\n');
990 ds_put_cstr(&txn->comment, s);
994 ovsdb_txn_get_comment(const struct ovsdb_txn *txn)
996 return txn->comment.length ? ds_cstr_ro(&txn->comment) : NULL;
1000 ovsdb_txn_row_prefree(struct ovsdb_txn_row *txn_row)
1002 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
1004 txn_table->n_processed--;
1005 hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
1008 txn_row->old->txn_row = NULL;
1011 txn_row->new->txn_row = NULL;
1016 ovsdb_txn_table_destroy(struct ovsdb_txn_table *txn_table)
1020 ovs_assert(hmap_is_empty(&txn_table->txn_rows));
1022 for (i = 0; i < txn_table->table->schema->n_indexes; i++) {
1023 hmap_destroy(&txn_table->txn_indexes[i]);
1025 free(txn_table->txn_indexes);
1027 txn_table->table->txn_table = NULL;
1028 hmap_destroy(&txn_table->txn_rows);
1029 ovs_list_remove(&txn_table->node);
1033 /* Calls 'cb' for every txn_row within 'txn'. If 'cb' returns nonnull, this
1034 * aborts the iteration and for_each_txn_row() passes the error up. Otherwise,
1035 * returns a null pointer after iteration is complete.
1037 * 'cb' may insert new txn_rows and new txn_tables into 'txn'. It may delete
1038 * the txn_row that it is passed in, or txn_rows in txn_tables other than the
1039 * one passed to 'cb'. It may *not* delete txn_rows other than the one passed
1040 * in within the same txn_table. It may *not* delete any txn_tables. As long
1041 * as these rules are followed, 'cb' will be called exactly once for each
1042 * txn_row in 'txn', even those added by 'cb'.
1044 * (Even though 'cb' is not allowed to delete some txn_rows, it can still
1045 * delete any actual row by clearing a txn_row's 'new' member.)
1047 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
1048 for_each_txn_row(struct ovsdb_txn *txn,
1049 struct ovsdb_error *(*cb)(struct ovsdb_txn *,
1050 struct ovsdb_txn_row *))
1057 struct ovsdb_txn_table *t, *next_txn_table;
1060 LIST_FOR_EACH_SAFE (t, next_txn_table, node, &txn->txn_tables) {
1061 if (t->serial != serial) {
1066 while (t->n_processed < hmap_count(&t->txn_rows)) {
1067 struct ovsdb_txn_row *r, *next_txn_row;
1069 HMAP_FOR_EACH_SAFE (r, next_txn_row, hmap_node, &t->txn_rows) {
1070 if (r->serial != serial) {
1071 struct ovsdb_error *error;
1084 if (hmap_is_empty(&t->txn_rows)) {
1085 /* Table is empty. Drop it. */
1086 ovsdb_txn_table_destroy(t);