1 /* Copyright (c) 2009, 2010, 2011, 2012 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 "dynamic-string.h"
26 #include "ovsdb-error.h"
34 struct list txn_tables; /* Contains "struct ovsdb_txn_table"s. */
38 /* A table modified by a transaction. */
39 struct ovsdb_txn_table {
40 struct list node; /* Element in ovsdb_txn's txn_tables list. */
41 struct ovsdb_table *table;
42 struct hmap txn_rows; /* Contains "struct ovsdb_txn_row"s. */
44 /* This has the same form as the 'indexes' member of struct ovsdb_table,
45 * but it is only used or updated at transaction commit time, from
46 * check_index_uniqueness(). */
47 struct hmap *txn_indexes;
49 /* Used by for_each_txn_row(). */
50 unsigned int serial; /* Serial number of in-progress iteration. */
51 unsigned int n_processed; /* Number of rows processed. */
54 /* A row modified by the transaction:
56 * - A row added by a transaction will have null 'old' and non-null 'new'.
58 * - A row deleted by a transaction will have non-null 'old' and null
61 * - A row modified by a transaction will have non-null 'old' and 'new'.
63 * - 'old' and 'new' both null indicates that a row was added then deleted
64 * within a single transaction. Most of the time we instead delete the
65 * ovsdb_txn_row entirely, but inside a for_each_txn_row() callback
66 * there are restrictions that sometimes mean we have to leave the
67 * ovsdb_txn_row in place.
69 struct ovsdb_txn_row {
70 struct hmap_node hmap_node; /* In ovsdb_txn_table's txn_rows hmap. */
71 struct ovsdb_row *old; /* The old row. */
72 struct ovsdb_row *new; /* The new row. */
73 size_t n_refs; /* Number of remaining references. */
75 /* These members are the same as the corresponding members of 'old' or
76 * 'new'. They are present here for convenience and because occasionally
77 * there can be an ovsdb_txn_row where both 'old' and 'new' are NULL. */
79 struct ovsdb_table *table;
81 /* Used by for_each_txn_row(). */
82 unsigned int serial; /* Serial number of in-progress commit. */
84 unsigned long changed[]; /* Bits set to 1 for columns that changed. */
87 static struct ovsdb_error * WARN_UNUSED_RESULT
88 delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *r);
89 static void ovsdb_txn_row_prefree(struct ovsdb_txn_row *);
90 static struct ovsdb_error * WARN_UNUSED_RESULT
91 for_each_txn_row(struct ovsdb_txn *txn,
92 struct ovsdb_error *(*)(struct ovsdb_txn *,
93 struct ovsdb_txn_row *));
95 /* Used by for_each_txn_row() to track tables and rows that have been
97 static unsigned int serial;
100 ovsdb_txn_create(struct ovsdb *db)
102 struct ovsdb_txn *txn = xmalloc(sizeof *txn);
104 list_init(&txn->txn_tables);
105 ds_init(&txn->comment);
110 ovsdb_txn_free(struct ovsdb_txn *txn)
112 ovs_assert(list_is_empty(&txn->txn_tables));
113 ds_destroy(&txn->comment);
117 static struct ovsdb_error *
118 ovsdb_txn_row_abort(struct ovsdb_txn *txn OVS_UNUSED,
119 struct ovsdb_txn_row *txn_row)
121 struct ovsdb_row *old = txn_row->old;
122 struct ovsdb_row *new = txn_row->new;
124 ovsdb_txn_row_prefree(txn_row);
127 hmap_remove(&new->table->rows, &new->hmap_node);
130 hmap_insert(&old->table->rows, &old->hmap_node, ovsdb_row_hash(old));
132 hmap_replace(&new->table->rows, &new->hmap_node, &old->hmap_node);
134 ovsdb_row_destroy(new);
140 /* Returns the offset in bytes from the start of an ovsdb_row for 'table' to
141 * the hmap_node for the index numbered 'i'. */
143 ovsdb_row_index_offset__(const struct ovsdb_table *table, size_t i)
145 size_t n_fields = shash_count(&table->schema->columns);
146 return (offsetof(struct ovsdb_row, fields)
147 + n_fields * sizeof(struct ovsdb_datum)
148 + i * sizeof(struct hmap_node));
151 /* Returns the hmap_node in 'row' for the index numbered 'i'. */
152 static struct hmap_node *
153 ovsdb_row_get_index_node(struct ovsdb_row *row, size_t i)
155 return (void *) ((char *) row + ovsdb_row_index_offset__(row->table, i));
158 /* Returns the ovsdb_row given 'index_node', which is a pointer to that row's
159 * hmap_node for the index numbered 'i' within 'table'. */
160 static struct ovsdb_row *
161 ovsdb_row_from_index_node(struct hmap_node *index_node,
162 const struct ovsdb_table *table, size_t i)
164 return (void *) ((char *) index_node - ovsdb_row_index_offset__(table, i));
168 ovsdb_txn_abort(struct ovsdb_txn *txn)
170 ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_abort));
174 static struct ovsdb_txn_row *
175 find_txn_row(const struct ovsdb_table *table, const struct uuid *uuid)
177 struct ovsdb_txn_row *txn_row;
179 if (!table->txn_table) {
183 HMAP_FOR_EACH_WITH_HASH (txn_row, hmap_node,
184 uuid_hash(uuid), &table->txn_table->txn_rows) {
185 if (uuid_equals(uuid, &txn_row->uuid)) {
193 static struct ovsdb_txn_row *
194 find_or_make_txn_row(struct ovsdb_txn *txn, const struct ovsdb_table *table,
195 const struct uuid *uuid)
197 struct ovsdb_txn_row *txn_row = find_txn_row(table, uuid);
199 const struct ovsdb_row *row = ovsdb_table_get_row(table, uuid);
201 txn_row = ovsdb_txn_row_modify(txn, row)->txn_row;
207 static struct ovsdb_error * WARN_UNUSED_RESULT
208 ovsdb_txn_adjust_atom_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
209 const struct ovsdb_column *c,
210 const struct ovsdb_base_type *base,
211 const union ovsdb_atom *atoms, unsigned int n,
214 const struct ovsdb_table *table;
217 if (!ovsdb_base_type_is_strong_ref(base)) {
221 table = base->u.uuid.refTable;
222 for (i = 0; i < n; i++) {
223 const struct uuid *uuid = &atoms[i].uuid;
224 struct ovsdb_txn_row *txn_row;
226 if (uuid_equals(uuid, ovsdb_row_get_uuid(r))) {
227 /* Self-references don't count. */
231 txn_row = find_or_make_txn_row(txn, table, uuid);
233 return ovsdb_error("referential integrity violation",
234 "Table %s column %s row "UUID_FMT" "
235 "references nonexistent row "UUID_FMT" in "
237 r->table->schema->name, c->name,
238 UUID_ARGS(ovsdb_row_get_uuid(r)),
239 UUID_ARGS(uuid), table->schema->name);
241 txn_row->n_refs += delta;
247 static struct ovsdb_error * WARN_UNUSED_RESULT
248 ovsdb_txn_adjust_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
249 const struct ovsdb_column *column, int delta)
251 const struct ovsdb_datum *field = &r->fields[column->index];
252 struct ovsdb_error *error;
254 error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.key,
255 field->keys, field->n, delta);
257 error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.value,
258 field->values, field->n, delta);
263 static struct ovsdb_error * WARN_UNUSED_RESULT
264 update_row_ref_count(struct ovsdb_txn *txn, struct ovsdb_txn_row *r)
266 struct ovsdb_table *table = r->table;
267 struct shash_node *node;
269 SHASH_FOR_EACH (node, &table->schema->columns) {
270 const struct ovsdb_column *column = node->data;
271 struct ovsdb_error *error;
274 error = ovsdb_txn_adjust_row_refs(txn, r->old, column, -1);
276 return OVSDB_WRAP_BUG("error decreasing refcount", error);
280 error = ovsdb_txn_adjust_row_refs(txn, r->new, column, 1);
290 static struct ovsdb_error * WARN_UNUSED_RESULT
291 check_ref_count(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *r)
293 if (r->new || !r->n_refs) {
296 return ovsdb_error("referential integrity violation",
297 "cannot delete %s row "UUID_FMT" because "
298 "of %zu remaining reference(s)",
299 r->table->schema->name, UUID_ARGS(&r->uuid),
304 static struct ovsdb_error * WARN_UNUSED_RESULT
305 delete_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *row,
306 const struct ovsdb_base_type *base,
307 const union ovsdb_atom *atoms, unsigned int n)
309 const struct ovsdb_table *table;
312 if (!ovsdb_base_type_is_strong_ref(base)) {
316 table = base->u.uuid.refTable;
317 for (i = 0; i < n; i++) {
318 const struct uuid *uuid = &atoms[i].uuid;
319 struct ovsdb_txn_row *txn_row;
321 if (uuid_equals(uuid, ovsdb_row_get_uuid(row))) {
322 /* Self-references don't count. */
326 txn_row = find_or_make_txn_row(txn, table, uuid);
328 return OVSDB_BUG("strong ref target missing");
329 } else if (!txn_row->n_refs) {
330 return OVSDB_BUG("strong ref target has zero n_refs");
331 } else if (!txn_row->new) {
332 return OVSDB_BUG("deleted strong ref target");
335 if (--txn_row->n_refs == 0) {
336 struct ovsdb_error *error = delete_garbage_row(txn, txn_row);
346 static struct ovsdb_error * WARN_UNUSED_RESULT
347 delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
349 struct shash_node *node;
350 struct ovsdb_row *row;
352 if (txn_row->table->schema->is_root) {
358 hmap_remove(&txn_row->table->rows, &row->hmap_node);
359 SHASH_FOR_EACH (node, &txn_row->table->schema->columns) {
360 const struct ovsdb_column *column = node->data;
361 const struct ovsdb_datum *field = &row->fields[column->index];
362 struct ovsdb_error *error;
364 error = delete_row_refs(txn, row,
365 &column->type.key, field->keys, field->n);
370 error = delete_row_refs(txn, row,
371 &column->type.value, field->values, field->n);
376 ovsdb_row_destroy(row);
381 static struct ovsdb_error * WARN_UNUSED_RESULT
382 collect_garbage(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
384 if (txn_row->new && !txn_row->n_refs) {
385 return delete_garbage_row(txn, txn_row);
390 static struct ovsdb_error * WARN_UNUSED_RESULT
391 update_ref_counts(struct ovsdb_txn *txn)
393 struct ovsdb_error *error;
395 error = for_each_txn_row(txn, update_row_ref_count);
400 return for_each_txn_row(txn, check_ref_count);
403 static struct ovsdb_error *
404 ovsdb_txn_row_commit(struct ovsdb_txn *txn OVS_UNUSED,
405 struct ovsdb_txn_row *txn_row)
407 size_t n_indexes = txn_row->table->schema->n_indexes;
412 for (i = 0; i < n_indexes; i++) {
413 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->old, i);
414 hmap_remove(&txn_row->table->indexes[i], node);
420 for (i = 0; i < n_indexes; i++) {
421 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->new, i);
422 hmap_insert(&txn_row->table->indexes[i], node, node->hash);
426 ovsdb_txn_row_prefree(txn_row);
428 txn_row->new->n_refs = txn_row->n_refs;
430 ovsdb_row_destroy(txn_row->old);
437 add_weak_ref(struct ovsdb_txn *txn,
438 const struct ovsdb_row *src_, const struct ovsdb_row *dst_)
440 struct ovsdb_row *src = CONST_CAST(struct ovsdb_row *, src_);
441 struct ovsdb_row *dst = CONST_CAST(struct ovsdb_row *, dst_);
442 struct ovsdb_weak_ref *weak;
448 dst = ovsdb_txn_row_modify(txn, dst);
450 if (!list_is_empty(&dst->dst_refs)) {
451 /* Omit duplicates. */
452 weak = CONTAINER_OF(list_back(&dst->dst_refs),
453 struct ovsdb_weak_ref, dst_node);
454 if (weak->src == src) {
459 weak = xmalloc(sizeof *weak);
461 list_push_back(&dst->dst_refs, &weak->dst_node);
462 list_push_back(&src->src_refs, &weak->src_node);
465 static struct ovsdb_error * WARN_UNUSED_RESULT
466 assess_weak_refs(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
468 struct ovsdb_table *table;
469 struct shash_node *node;
472 /* Mark rows that have weak references to 'txn_row' as modified, so
473 * that their weak references will get reassessed. */
474 struct ovsdb_weak_ref *weak, *next;
476 LIST_FOR_EACH_SAFE (weak, next, dst_node, &txn_row->old->dst_refs) {
477 if (!weak->src->txn_row) {
478 ovsdb_txn_row_modify(txn, weak->src);
484 /* We don't have to do anything about references that originate at
485 * 'txn_row', because ovsdb_row_destroy() will remove those weak
490 table = txn_row->table;
491 SHASH_FOR_EACH (node, &table->schema->columns) {
492 const struct ovsdb_column *column = node->data;
493 struct ovsdb_datum *datum = &txn_row->new->fields[column->index];
494 unsigned int orig_n, i;
499 if (ovsdb_base_type_is_weak_ref(&column->type.key)) {
500 for (i = 0; i < datum->n; ) {
501 const struct ovsdb_row *row;
503 row = ovsdb_table_get_row(column->type.key.u.uuid.refTable,
504 &datum->keys[i].uuid);
506 add_weak_ref(txn, txn_row->new, row);
509 if (uuid_is_zero(&datum->keys[i].uuid)) {
512 ovsdb_datum_remove_unsafe(datum, i, &column->type);
517 if (ovsdb_base_type_is_weak_ref(&column->type.value)) {
518 for (i = 0; i < datum->n; ) {
519 const struct ovsdb_row *row;
521 row = ovsdb_table_get_row(column->type.value.u.uuid.refTable,
522 &datum->values[i].uuid);
524 add_weak_ref(txn, txn_row->new, row);
527 if (uuid_is_zero(&datum->values[i].uuid)) {
530 ovsdb_datum_remove_unsafe(datum, i, &column->type);
535 if (datum->n != orig_n) {
536 bitmap_set1(txn_row->changed, column->index);
537 ovsdb_datum_sort_assert(datum, column->type.key.type);
538 if (datum->n < column->type.n_min) {
539 const struct uuid *row_uuid = ovsdb_row_get_uuid(txn_row->new);
540 if (zero && !txn_row->old) {
542 "constraint violation",
543 "Weak reference column \"%s\" in \"%s\" row "UUID_FMT
544 " (inserted within this transaction) contained "
545 "all-zeros UUID (probably as the default value for "
546 "this column) but deleting this value caused a "
547 "constraint volation because this column is not "
548 "allowed to be empty.", column->name,
549 table->schema->name, UUID_ARGS(row_uuid));
552 "constraint violation",
553 "Deletion of %u weak reference(s) to deleted (or "
554 "never-existing) rows from column \"%s\" in \"%s\" "
555 "row "UUID_FMT" %scaused this column to become empty, "
556 "but constraints on this column disallow an "
558 orig_n - datum->n, column->name, table->schema->name,
562 : "(inserted within this transaction) "));
571 static struct ovsdb_error * WARN_UNUSED_RESULT
572 determine_changes(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
574 struct ovsdb_table *table = txn_row->table;
576 if (txn_row->old && txn_row->new) {
577 struct shash_node *node;
578 bool changed = false;
580 SHASH_FOR_EACH (node, &table->schema->columns) {
581 const struct ovsdb_column *column = node->data;
582 const struct ovsdb_type *type = &column->type;
583 unsigned int idx = column->index;
585 if (!ovsdb_datum_equals(&txn_row->old->fields[idx],
586 &txn_row->new->fields[idx],
588 bitmap_set1(txn_row->changed, idx);
594 /* Nothing actually changed in this row, so drop it. */
595 ovsdb_txn_row_abort(txn, txn_row);
598 bitmap_set_multiple(txn_row->changed, 0,
599 shash_count(&table->schema->columns), 1);
605 static struct ovsdb_error * WARN_UNUSED_RESULT
606 check_max_rows(struct ovsdb_txn *txn)
608 struct ovsdb_txn_table *t;
610 LIST_FOR_EACH (t, node, &txn->txn_tables) {
611 size_t n_rows = hmap_count(&t->table->rows);
612 unsigned int max_rows = t->table->schema->max_rows;
614 if (n_rows > max_rows) {
615 return ovsdb_error("constraint violation",
616 "transaction causes \"%s\" table to contain "
617 "%zu rows, greater than the schema-defined "
618 "limit of %u row(s)",
619 t->table->schema->name, n_rows, max_rows);
626 static struct ovsdb_row *
627 ovsdb_index_search(struct hmap *index, struct ovsdb_row *row, size_t i,
630 const struct ovsdb_table *table = row->table;
631 const struct ovsdb_column_set *columns = &table->schema->indexes[i];
632 struct hmap_node *node;
634 for (node = hmap_first_with_hash(index, hash); node;
635 node = hmap_next_with_hash(node)) {
636 struct ovsdb_row *irow = ovsdb_row_from_index_node(node, table, i);
637 if (ovsdb_row_equal_columns(row, irow, columns)) {
646 duplicate_index_row__(const struct ovsdb_column_set *index,
647 const struct ovsdb_row *row,
651 size_t n_columns = shash_count(&row->table->schema->columns);
653 ds_put_format(out, "%s row, with UUID "UUID_FMT", ",
654 title, UUID_ARGS(ovsdb_row_get_uuid(row)));
656 || bitmap_scan(row->txn_row->changed, 0, n_columns) == n_columns) {
657 ds_put_cstr(out, "existed in the database before this "
658 "transaction and was not modified by the transaction.");
659 } else if (!row->txn_row->old) {
660 ds_put_cstr(out, "was inserted by this transaction.");
661 } else if (ovsdb_row_equal_columns(row->txn_row->old,
662 row->txn_row->new, index)) {
663 ds_put_cstr(out, "existed in the database before this "
664 "transaction, which modified some of the row's columns "
665 "but not any columns in this index.");
667 ds_put_cstr(out, "had the following index values before the "
669 ovsdb_row_columns_to_string(row->txn_row->old, index, out);
670 ds_put_char(out, '.');
674 static struct ovsdb_error * WARN_UNUSED_RESULT
675 duplicate_index_row(const struct ovsdb_column_set *index,
676 const struct ovsdb_row *a,
677 const struct ovsdb_row *b)
679 struct ovsdb_column_set all_columns;
680 struct ovsdb_error *error;
684 /* Put 'a' and 'b' in a predictable order to make error messages
685 * reproducible for testing. */
686 ovsdb_column_set_init(&all_columns);
687 ovsdb_column_set_add_all(&all_columns, a->table);
688 if (ovsdb_row_compare_columns_3way(a, b, &all_columns) < 0) {
689 const struct ovsdb_row *tmp = a;
693 ovsdb_column_set_destroy(&all_columns);
695 index_s = ovsdb_column_set_to_string(index);
698 ds_put_format(&s, "Transaction causes multiple rows in \"%s\" table to "
699 "have identical values (", a->table->schema->name);
700 ovsdb_row_columns_to_string(a, index, &s);
701 ds_put_format(&s, ") for index on %s. ", index_s);
702 duplicate_index_row__(index, a, "First", &s);
703 ds_put_cstr(&s, " ");
704 duplicate_index_row__(index, b, "Second", &s);
708 error = ovsdb_error("constraint violation", "%s", ds_cstr(&s));
713 static struct ovsdb_error * WARN_UNUSED_RESULT
714 check_index_uniqueness(struct ovsdb_txn *txn OVS_UNUSED,
715 struct ovsdb_txn_row *txn_row)
717 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
718 struct ovsdb_table *table = txn_row->table;
719 struct ovsdb_row *row = txn_row->new;
726 for (i = 0; i < table->schema->n_indexes; i++) {
727 const struct ovsdb_column_set *index = &table->schema->indexes[i];
728 struct ovsdb_row *irow;
731 hash = ovsdb_row_hash_columns(row, index, 0);
732 irow = ovsdb_index_search(&txn_table->txn_indexes[i], row, i, hash);
734 return duplicate_index_row(index, irow, row);
737 irow = ovsdb_index_search(&table->indexes[i], row, i, hash);
738 if (irow && !irow->txn_row) {
739 return duplicate_index_row(index, irow, row);
742 hmap_insert(&txn_table->txn_indexes[i],
743 ovsdb_row_get_index_node(row, i), hash);
750 ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
752 struct ovsdb_replica *replica;
753 struct ovsdb_error *error;
755 /* Figure out what actually changed, and abort early if the transaction
756 * was really a no-op. */
757 error = for_each_txn_row(txn, determine_changes);
759 return OVSDB_WRAP_BUG("can't happen", error);
761 if (list_is_empty(&txn->txn_tables)) {
762 ovsdb_txn_abort(txn);
766 /* Update reference counts and check referential integrity. */
767 error = update_ref_counts(txn);
769 ovsdb_txn_abort(txn);
773 /* Delete unreferenced, non-root rows. */
774 error = for_each_txn_row(txn, collect_garbage);
776 ovsdb_txn_abort(txn);
777 return OVSDB_WRAP_BUG("can't happen", error);
780 /* Check maximum rows table constraints. */
781 error = check_max_rows(txn);
783 ovsdb_txn_abort(txn);
787 /* Check reference counts and remove bad references for "weak" referential
789 error = for_each_txn_row(txn, assess_weak_refs);
791 ovsdb_txn_abort(txn);
795 /* Verify that the indexes will still be unique post-transaction. */
796 error = for_each_txn_row(txn, check_index_uniqueness);
798 ovsdb_txn_abort(txn);
802 /* Send the commit to each replica. */
803 LIST_FOR_EACH (replica, node, &txn->db->replicas) {
804 error = (replica->class->commit)(replica, txn, durable);
806 /* We don't support two-phase commit so only the first replica is
807 * allowed to report an error. */
808 ovs_assert(&replica->node == txn->db->replicas.next);
810 ovsdb_txn_abort(txn);
815 /* Finalize commit. */
816 txn->db->run_triggers = true;
817 ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_commit));
824 ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
825 ovsdb_txn_row_cb_func *cb, void *aux)
827 struct ovsdb_txn_table *t;
828 struct ovsdb_txn_row *r;
830 LIST_FOR_EACH (t, node, &txn->txn_tables) {
831 HMAP_FOR_EACH (r, hmap_node, &t->txn_rows) {
832 if ((r->old || r->new) && !cb(r->old, r->new, r->changed, aux)) {
839 static struct ovsdb_txn_table *
840 ovsdb_txn_create_txn_table(struct ovsdb_txn *txn, struct ovsdb_table *table)
842 if (!table->txn_table) {
843 struct ovsdb_txn_table *txn_table;
846 table->txn_table = txn_table = xmalloc(sizeof *table->txn_table);
847 txn_table->table = table;
848 hmap_init(&txn_table->txn_rows);
849 txn_table->serial = serial - 1;
850 txn_table->txn_indexes = xmalloc(table->schema->n_indexes
851 * sizeof *txn_table->txn_indexes);
852 for (i = 0; i < table->schema->n_indexes; i++) {
853 hmap_init(&txn_table->txn_indexes[i]);
855 list_push_back(&txn->txn_tables, &txn_table->node);
857 return table->txn_table;
860 static struct ovsdb_txn_row *
861 ovsdb_txn_row_create(struct ovsdb_txn *txn, struct ovsdb_table *table,
862 const struct ovsdb_row *old_, struct ovsdb_row *new)
864 const struct ovsdb_row *row = old_ ? old_ : new;
865 struct ovsdb_row *old = CONST_CAST(struct ovsdb_row *, old_);
866 size_t n_columns = shash_count(&table->schema->columns);
867 struct ovsdb_txn_table *txn_table;
868 struct ovsdb_txn_row *txn_row;
870 txn_row = xzalloc(offsetof(struct ovsdb_txn_row, changed)
871 + bitmap_n_bytes(n_columns));
872 txn_row->uuid = *ovsdb_row_get_uuid(row);
873 txn_row->table = row->table;
876 txn_row->n_refs = old ? old->n_refs : 0;
877 txn_row->serial = serial - 1;
880 old->txn_row = txn_row;
883 new->txn_row = txn_row;
886 txn_table = ovsdb_txn_create_txn_table(txn, table);
887 hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node,
888 ovsdb_row_hash(old ? old : new));
894 ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
896 struct ovsdb_row *ro_row = CONST_CAST(struct ovsdb_row *, ro_row_);
898 if (ro_row->txn_row) {
899 ovs_assert(ro_row == ro_row->txn_row->new);
902 struct ovsdb_table *table = ro_row->table;
903 struct ovsdb_row *rw_row;
905 rw_row = ovsdb_row_clone(ro_row);
906 rw_row->n_refs = ro_row->n_refs;
907 uuid_generate(ovsdb_row_get_version_rw(rw_row));
908 ovsdb_txn_row_create(txn, table, ro_row, rw_row);
909 hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
916 ovsdb_txn_row_insert(struct ovsdb_txn *txn, struct ovsdb_row *row)
918 uint32_t hash = ovsdb_row_hash(row);
919 struct ovsdb_table *table = row->table;
921 uuid_generate(ovsdb_row_get_version_rw(row));
923 ovsdb_txn_row_create(txn, table, NULL, row);
924 hmap_insert(&table->rows, &row->hmap_node, hash);
927 /* 'row' must be assumed destroyed upon return; the caller must not reference
930 ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
932 struct ovsdb_row *row = CONST_CAST(struct ovsdb_row *, row_);
933 struct ovsdb_table *table = row->table;
934 struct ovsdb_txn_row *txn_row = row->txn_row;
936 hmap_remove(&table->rows, &row->hmap_node);
939 ovsdb_txn_row_create(txn, table, row, NULL);
941 ovs_assert(txn_row->new == row);
945 hmap_remove(&table->txn_table->txn_rows, &txn_row->hmap_node);
948 ovsdb_row_destroy(row);
953 ovsdb_txn_add_comment(struct ovsdb_txn *txn, const char *s)
955 if (txn->comment.length) {
956 ds_put_char(&txn->comment, '\n');
958 ds_put_cstr(&txn->comment, s);
962 ovsdb_txn_get_comment(const struct ovsdb_txn *txn)
964 return txn->comment.length ? ds_cstr_ro(&txn->comment) : NULL;
968 ovsdb_txn_row_prefree(struct ovsdb_txn_row *txn_row)
970 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
972 txn_table->n_processed--;
973 hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
976 txn_row->old->txn_row = NULL;
979 txn_row->new->txn_row = NULL;
984 ovsdb_txn_table_destroy(struct ovsdb_txn_table *txn_table)
988 ovs_assert(hmap_is_empty(&txn_table->txn_rows));
990 for (i = 0; i < txn_table->table->schema->n_indexes; i++) {
991 hmap_destroy(&txn_table->txn_indexes[i]);
993 free(txn_table->txn_indexes);
995 txn_table->table->txn_table = NULL;
996 hmap_destroy(&txn_table->txn_rows);
997 list_remove(&txn_table->node);
1001 /* Calls 'cb' for every txn_row within 'txn'. If 'cb' returns nonnull, this
1002 * aborts the iteration and for_each_txn_row() passes the error up. Otherwise,
1003 * returns a null pointer after iteration is complete.
1005 * 'cb' may insert new txn_rows and new txn_tables into 'txn'. It may delete
1006 * the txn_row that it is passed in, or txn_rows in txn_tables other than the
1007 * one passed to 'cb'. It may *not* delete txn_rows other than the one passed
1008 * in within the same txn_table. It may *not* delete any txn_tables. As long
1009 * as these rules are followed, 'cb' will be called exactly once for each
1010 * txn_row in 'txn', even those added by 'cb'.
1012 * (Even though 'cb' is not allowed to delete some txn_rows, it can still
1013 * delete any actual row by clearing a txn_row's 'new' member.)
1015 static struct ovsdb_error * WARN_UNUSED_RESULT
1016 for_each_txn_row(struct ovsdb_txn *txn,
1017 struct ovsdb_error *(*cb)(struct ovsdb_txn *,
1018 struct ovsdb_txn_row *))
1025 struct ovsdb_txn_table *t, *next_txn_table;
1028 LIST_FOR_EACH_SAFE (t, next_txn_table, node, &txn->txn_tables) {
1029 if (t->serial != serial) {
1034 while (t->n_processed < hmap_count(&t->txn_rows)) {
1035 struct ovsdb_txn_row *r, *next_txn_row;
1037 HMAP_FOR_EACH_SAFE (r, next_txn_row, hmap_node, &t->txn_rows) {
1038 if (r->serial != serial) {
1039 struct ovsdb_error *error;
1052 if (hmap_is_empty(&t->txn_rows)) {
1053 /* Table is empty. Drop it. */
1054 ovsdb_txn_table_destroy(t);