1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 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"
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 list_init(&txn->txn_tables);
106 ds_init(&txn->comment);
111 ovsdb_txn_free(struct ovsdb_txn *txn)
113 ovs_assert(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;
275 error = ovsdb_txn_adjust_row_refs(txn, r->old, column, -1);
277 return OVSDB_WRAP_BUG("error decreasing refcount", error);
281 error = ovsdb_txn_adjust_row_refs(txn, r->new, column, 1);
291 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
292 check_ref_count(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *r)
294 if (r->new || !r->n_refs) {
297 return ovsdb_error("referential integrity violation",
298 "cannot delete %s row "UUID_FMT" because "
299 "of %"PRIuSIZE" remaining reference(s)",
300 r->table->schema->name, UUID_ARGS(&r->uuid),
305 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
306 delete_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *row,
307 const struct ovsdb_base_type *base,
308 const union ovsdb_atom *atoms, unsigned int n)
310 const struct ovsdb_table *table;
313 if (!ovsdb_base_type_is_strong_ref(base)) {
317 table = base->u.uuid.refTable;
318 for (i = 0; i < n; i++) {
319 const struct uuid *uuid = &atoms[i].uuid;
320 struct ovsdb_txn_row *txn_row;
322 if (uuid_equals(uuid, ovsdb_row_get_uuid(row))) {
323 /* Self-references don't count. */
327 txn_row = find_or_make_txn_row(txn, table, uuid);
329 return OVSDB_BUG("strong ref target missing");
330 } else if (!txn_row->n_refs) {
331 return OVSDB_BUG("strong ref target has zero n_refs");
332 } else if (!txn_row->new) {
333 return OVSDB_BUG("deleted strong ref target");
336 if (--txn_row->n_refs == 0) {
337 struct ovsdb_error *error = delete_garbage_row(txn, txn_row);
347 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
348 delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
350 struct shash_node *node;
351 struct ovsdb_row *row;
353 if (txn_row->table->schema->is_root) {
359 hmap_remove(&txn_row->table->rows, &row->hmap_node);
360 SHASH_FOR_EACH (node, &txn_row->table->schema->columns) {
361 const struct ovsdb_column *column = node->data;
362 const struct ovsdb_datum *field = &row->fields[column->index];
363 struct ovsdb_error *error;
365 error = delete_row_refs(txn, row,
366 &column->type.key, field->keys, field->n);
371 error = delete_row_refs(txn, row,
372 &column->type.value, field->values, field->n);
377 ovsdb_row_destroy(row);
382 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
383 collect_garbage(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
385 if (txn_row->new && !txn_row->n_refs) {
386 return delete_garbage_row(txn, txn_row);
391 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
392 update_ref_counts(struct ovsdb_txn *txn)
394 struct ovsdb_error *error;
396 error = for_each_txn_row(txn, update_row_ref_count);
401 return for_each_txn_row(txn, check_ref_count);
404 static struct ovsdb_error *
405 ovsdb_txn_row_commit(struct ovsdb_txn *txn OVS_UNUSED,
406 struct ovsdb_txn_row *txn_row)
408 size_t n_indexes = txn_row->table->schema->n_indexes;
413 for (i = 0; i < n_indexes; i++) {
414 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->old, i);
415 hmap_remove(&txn_row->table->indexes[i], node);
421 for (i = 0; i < n_indexes; i++) {
422 struct hmap_node *node = ovsdb_row_get_index_node(txn_row->new, i);
423 hmap_insert(&txn_row->table->indexes[i], node, node->hash);
427 ovsdb_txn_row_prefree(txn_row);
429 txn_row->new->n_refs = txn_row->n_refs;
431 ovsdb_row_destroy(txn_row->old);
438 add_weak_ref(struct ovsdb_txn *txn,
439 const struct ovsdb_row *src_, const struct ovsdb_row *dst_)
441 struct ovsdb_row *src = CONST_CAST(struct ovsdb_row *, src_);
442 struct ovsdb_row *dst = CONST_CAST(struct ovsdb_row *, dst_);
443 struct ovsdb_weak_ref *weak;
449 dst = ovsdb_txn_row_modify(txn, dst);
451 if (!list_is_empty(&dst->dst_refs)) {
452 /* Omit duplicates. */
453 weak = CONTAINER_OF(list_back(&dst->dst_refs),
454 struct ovsdb_weak_ref, dst_node);
455 if (weak->src == src) {
460 weak = xmalloc(sizeof *weak);
462 list_push_back(&dst->dst_refs, &weak->dst_node);
463 list_push_back(&src->src_refs, &weak->src_node);
466 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
467 assess_weak_refs(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
469 struct ovsdb_table *table;
470 struct shash_node *node;
473 /* Mark rows that have weak references to 'txn_row' as modified, so
474 * that their weak references will get reassessed. */
475 struct ovsdb_weak_ref *weak, *next;
477 LIST_FOR_EACH_SAFE (weak, next, dst_node, &txn_row->old->dst_refs) {
478 if (!weak->src->txn_row) {
479 ovsdb_txn_row_modify(txn, weak->src);
485 /* We don't have to do anything about references that originate at
486 * 'txn_row', because ovsdb_row_destroy() will remove those weak
491 table = txn_row->table;
492 SHASH_FOR_EACH (node, &table->schema->columns) {
493 const struct ovsdb_column *column = node->data;
494 struct ovsdb_datum *datum = &txn_row->new->fields[column->index];
495 unsigned int orig_n, i;
500 if (ovsdb_base_type_is_weak_ref(&column->type.key)) {
501 for (i = 0; i < datum->n; ) {
502 const struct ovsdb_row *row;
504 row = ovsdb_table_get_row(column->type.key.u.uuid.refTable,
505 &datum->keys[i].uuid);
507 add_weak_ref(txn, txn_row->new, row);
510 if (uuid_is_zero(&datum->keys[i].uuid)) {
513 ovsdb_datum_remove_unsafe(datum, i, &column->type);
518 if (ovsdb_base_type_is_weak_ref(&column->type.value)) {
519 for (i = 0; i < datum->n; ) {
520 const struct ovsdb_row *row;
522 row = ovsdb_table_get_row(column->type.value.u.uuid.refTable,
523 &datum->values[i].uuid);
525 add_weak_ref(txn, txn_row->new, row);
528 if (uuid_is_zero(&datum->values[i].uuid)) {
531 ovsdb_datum_remove_unsafe(datum, i, &column->type);
536 if (datum->n != orig_n) {
537 bitmap_set1(txn_row->changed, OVSDB_COL_VERSION);
538 bitmap_set1(txn_row->changed, column->index);
539 ovsdb_datum_sort_assert(datum, column->type.key.type);
540 if (datum->n < column->type.n_min) {
541 const struct uuid *row_uuid = ovsdb_row_get_uuid(txn_row->new);
542 if (zero && !txn_row->old) {
544 "constraint violation",
545 "Weak reference column \"%s\" in \"%s\" row "UUID_FMT
546 " (inserted within this transaction) contained "
547 "all-zeros UUID (probably as the default value for "
548 "this column) but deleting this value caused a "
549 "constraint volation because this column is not "
550 "allowed to be empty.", column->name,
551 table->schema->name, UUID_ARGS(row_uuid));
554 "constraint violation",
555 "Deletion of %u weak reference(s) to deleted (or "
556 "never-existing) rows from column \"%s\" in \"%s\" "
557 "row "UUID_FMT" %scaused this column to become empty, "
558 "but constraints on this column disallow an "
560 orig_n - datum->n, column->name, table->schema->name,
564 : "(inserted within this transaction) "));
573 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
574 determine_changes(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
576 struct ovsdb_table *table = txn_row->table;
578 if (txn_row->old && txn_row->new) {
579 struct shash_node *node;
580 bool changed = false;
582 SHASH_FOR_EACH (node, &table->schema->columns) {
583 const struct ovsdb_column *column = node->data;
584 const struct ovsdb_type *type = &column->type;
585 unsigned int idx = column->index;
587 if (!ovsdb_datum_equals(&txn_row->old->fields[idx],
588 &txn_row->new->fields[idx],
590 bitmap_set1(txn_row->changed, idx);
596 /* Nothing actually changed in this row, so drop it. */
597 ovsdb_txn_row_abort(txn, txn_row);
600 bitmap_set_multiple(txn_row->changed, 0,
601 shash_count(&table->schema->columns), 1);
607 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
608 check_max_rows(struct ovsdb_txn *txn)
610 struct ovsdb_txn_table *t;
612 LIST_FOR_EACH (t, node, &txn->txn_tables) {
613 size_t n_rows = hmap_count(&t->table->rows);
614 unsigned int max_rows = t->table->schema->max_rows;
616 if (n_rows > max_rows) {
617 return ovsdb_error("constraint violation",
618 "transaction causes \"%s\" table to contain "
619 "%"PRIuSIZE" rows, greater than the schema-defined "
620 "limit of %u row(s)",
621 t->table->schema->name, n_rows, max_rows);
628 static struct ovsdb_row *
629 ovsdb_index_search(struct hmap *index, struct ovsdb_row *row, size_t i,
632 const struct ovsdb_table *table = row->table;
633 const struct ovsdb_column_set *columns = &table->schema->indexes[i];
634 struct hmap_node *node;
636 for (node = hmap_first_with_hash(index, hash); node;
637 node = hmap_next_with_hash(node)) {
638 struct ovsdb_row *irow = ovsdb_row_from_index_node(node, table, i);
639 if (ovsdb_row_equal_columns(row, irow, columns)) {
648 duplicate_index_row__(const struct ovsdb_column_set *index,
649 const struct ovsdb_row *row,
653 size_t n_columns = shash_count(&row->table->schema->columns);
655 ds_put_format(out, "%s row, with UUID "UUID_FMT", ",
656 title, UUID_ARGS(ovsdb_row_get_uuid(row)));
658 || bitmap_scan(row->txn_row->changed, 1, 0, n_columns) == n_columns) {
659 ds_put_cstr(out, "existed in the database before this "
660 "transaction and was not modified by the transaction.");
661 } else if (!row->txn_row->old) {
662 ds_put_cstr(out, "was inserted by this transaction.");
663 } else if (ovsdb_row_equal_columns(row->txn_row->old,
664 row->txn_row->new, index)) {
665 ds_put_cstr(out, "existed in the database before this "
666 "transaction, which modified some of the row's columns "
667 "but not any columns in this index.");
669 ds_put_cstr(out, "had the following index values before the "
671 ovsdb_row_columns_to_string(row->txn_row->old, index, out);
672 ds_put_char(out, '.');
676 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
677 duplicate_index_row(const struct ovsdb_column_set *index,
678 const struct ovsdb_row *a,
679 const struct ovsdb_row *b)
681 struct ovsdb_column_set all_columns;
682 struct ovsdb_error *error;
686 /* Put 'a' and 'b' in a predictable order to make error messages
687 * reproducible for testing. */
688 ovsdb_column_set_init(&all_columns);
689 ovsdb_column_set_add_all(&all_columns, a->table);
690 if (ovsdb_row_compare_columns_3way(a, b, &all_columns) < 0) {
691 const struct ovsdb_row *tmp = a;
695 ovsdb_column_set_destroy(&all_columns);
697 index_s = ovsdb_column_set_to_string(index);
700 ds_put_format(&s, "Transaction causes multiple rows in \"%s\" table to "
701 "have identical values (", a->table->schema->name);
702 ovsdb_row_columns_to_string(a, index, &s);
703 ds_put_format(&s, ") for index on %s. ", index_s);
704 duplicate_index_row__(index, a, "First", &s);
705 ds_put_cstr(&s, " ");
706 duplicate_index_row__(index, b, "Second", &s);
710 error = ovsdb_error("constraint violation", "%s", ds_cstr(&s));
715 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
716 check_index_uniqueness(struct ovsdb_txn *txn OVS_UNUSED,
717 struct ovsdb_txn_row *txn_row)
719 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
720 struct ovsdb_table *table = txn_row->table;
721 struct ovsdb_row *row = txn_row->new;
728 for (i = 0; i < table->schema->n_indexes; i++) {
729 const struct ovsdb_column_set *index = &table->schema->indexes[i];
730 struct ovsdb_row *irow;
733 hash = ovsdb_row_hash_columns(row, index, 0);
734 irow = ovsdb_index_search(&txn_table->txn_indexes[i], row, i, hash);
736 return duplicate_index_row(index, irow, row);
739 irow = ovsdb_index_search(&table->indexes[i], row, i, hash);
740 if (irow && !irow->txn_row) {
741 return duplicate_index_row(index, irow, row);
744 hmap_insert(&txn_table->txn_indexes[i],
745 ovsdb_row_get_index_node(row, i), hash);
751 static struct ovsdb_error *
752 ovsdb_txn_commit_(struct ovsdb_txn *txn, bool durable)
754 struct ovsdb_replica *replica;
755 struct ovsdb_error *error;
757 /* Figure out what actually changed, and abort early if the transaction
758 * was really a no-op. */
759 error = for_each_txn_row(txn, determine_changes);
761 return OVSDB_WRAP_BUG("can't happen", error);
763 if (list_is_empty(&txn->txn_tables)) {
764 ovsdb_txn_abort(txn);
768 /* Update reference counts and check referential integrity. */
769 error = update_ref_counts(txn);
771 ovsdb_txn_abort(txn);
775 /* Delete unreferenced, non-root rows. */
776 error = for_each_txn_row(txn, collect_garbage);
778 ovsdb_txn_abort(txn);
779 return OVSDB_WRAP_BUG("can't happen", error);
782 /* Check maximum rows table constraints. */
783 error = check_max_rows(txn);
785 ovsdb_txn_abort(txn);
789 /* Check reference counts and remove bad references for "weak" referential
791 error = for_each_txn_row(txn, assess_weak_refs);
793 ovsdb_txn_abort(txn);
797 /* Verify that the indexes will still be unique post-transaction. */
798 error = for_each_txn_row(txn, check_index_uniqueness);
800 ovsdb_txn_abort(txn);
804 /* Send the commit to each replica. */
805 LIST_FOR_EACH (replica, node, &txn->db->replicas) {
806 error = (replica->class->commit)(replica, txn, durable);
808 /* We don't support two-phase commit so only the first replica is
809 * allowed to report an error. */
810 ovs_assert(&replica->node == txn->db->replicas.next);
812 ovsdb_txn_abort(txn);
817 /* Finalize commit. */
818 txn->db->run_triggers = true;
819 ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_commit));
826 ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
828 struct ovsdb_error *err;
830 PERF(__func__, err = ovsdb_txn_commit_(txn, durable));
835 ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
836 ovsdb_txn_row_cb_func *cb, void *aux)
838 struct ovsdb_txn_table *t;
839 struct ovsdb_txn_row *r;
841 LIST_FOR_EACH (t, node, &txn->txn_tables) {
842 HMAP_FOR_EACH (r, hmap_node, &t->txn_rows) {
843 if ((r->old || r->new) && !cb(r->old, r->new, r->changed, aux)) {
850 static struct ovsdb_txn_table *
851 ovsdb_txn_create_txn_table(struct ovsdb_txn *txn, struct ovsdb_table *table)
853 if (!table->txn_table) {
854 struct ovsdb_txn_table *txn_table;
857 table->txn_table = txn_table = xmalloc(sizeof *table->txn_table);
858 txn_table->table = table;
859 hmap_init(&txn_table->txn_rows);
860 txn_table->serial = serial - 1;
861 txn_table->txn_indexes = xmalloc(table->schema->n_indexes
862 * sizeof *txn_table->txn_indexes);
863 for (i = 0; i < table->schema->n_indexes; i++) {
864 hmap_init(&txn_table->txn_indexes[i]);
866 list_push_back(&txn->txn_tables, &txn_table->node);
868 return table->txn_table;
871 static struct ovsdb_txn_row *
872 ovsdb_txn_row_create(struct ovsdb_txn *txn, struct ovsdb_table *table,
873 const struct ovsdb_row *old_, struct ovsdb_row *new)
875 const struct ovsdb_row *row = old_ ? old_ : new;
876 struct ovsdb_row *old = CONST_CAST(struct ovsdb_row *, old_);
877 size_t n_columns = shash_count(&table->schema->columns);
878 struct ovsdb_txn_table *txn_table;
879 struct ovsdb_txn_row *txn_row;
881 txn_row = xzalloc(offsetof(struct ovsdb_txn_row, changed)
882 + bitmap_n_bytes(n_columns));
883 txn_row->uuid = *ovsdb_row_get_uuid(row);
884 txn_row->table = row->table;
887 txn_row->n_refs = old ? old->n_refs : 0;
888 txn_row->serial = serial - 1;
891 old->txn_row = txn_row;
894 new->txn_row = txn_row;
897 txn_table = ovsdb_txn_create_txn_table(txn, table);
898 hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node,
899 ovsdb_row_hash(old ? old : new));
905 ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
907 struct ovsdb_row *ro_row = CONST_CAST(struct ovsdb_row *, ro_row_);
909 if (ro_row->txn_row) {
910 ovs_assert(ro_row == ro_row->txn_row->new);
913 struct ovsdb_table *table = ro_row->table;
914 struct ovsdb_row *rw_row;
916 rw_row = ovsdb_row_clone(ro_row);
917 rw_row->n_refs = ro_row->n_refs;
918 uuid_generate(ovsdb_row_get_version_rw(rw_row));
919 ovsdb_txn_row_create(txn, table, ro_row, rw_row);
920 hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
927 ovsdb_txn_row_insert(struct ovsdb_txn *txn, struct ovsdb_row *row)
929 uint32_t hash = ovsdb_row_hash(row);
930 struct ovsdb_table *table = row->table;
932 uuid_generate(ovsdb_row_get_version_rw(row));
934 ovsdb_txn_row_create(txn, table, NULL, row);
935 hmap_insert(&table->rows, &row->hmap_node, hash);
938 /* 'row' must be assumed destroyed upon return; the caller must not reference
941 ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
943 struct ovsdb_row *row = CONST_CAST(struct ovsdb_row *, row_);
944 struct ovsdb_table *table = row->table;
945 struct ovsdb_txn_row *txn_row = row->txn_row;
947 hmap_remove(&table->rows, &row->hmap_node);
950 ovsdb_txn_row_create(txn, table, row, NULL);
952 ovs_assert(txn_row->new == row);
956 hmap_remove(&table->txn_table->txn_rows, &txn_row->hmap_node);
959 ovsdb_row_destroy(row);
964 ovsdb_txn_add_comment(struct ovsdb_txn *txn, const char *s)
966 if (txn->comment.length) {
967 ds_put_char(&txn->comment, '\n');
969 ds_put_cstr(&txn->comment, s);
973 ovsdb_txn_get_comment(const struct ovsdb_txn *txn)
975 return txn->comment.length ? ds_cstr_ro(&txn->comment) : NULL;
979 ovsdb_txn_row_prefree(struct ovsdb_txn_row *txn_row)
981 struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
983 txn_table->n_processed--;
984 hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
987 txn_row->old->txn_row = NULL;
990 txn_row->new->txn_row = NULL;
995 ovsdb_txn_table_destroy(struct ovsdb_txn_table *txn_table)
999 ovs_assert(hmap_is_empty(&txn_table->txn_rows));
1001 for (i = 0; i < txn_table->table->schema->n_indexes; i++) {
1002 hmap_destroy(&txn_table->txn_indexes[i]);
1004 free(txn_table->txn_indexes);
1006 txn_table->table->txn_table = NULL;
1007 hmap_destroy(&txn_table->txn_rows);
1008 list_remove(&txn_table->node);
1012 /* Calls 'cb' for every txn_row within 'txn'. If 'cb' returns nonnull, this
1013 * aborts the iteration and for_each_txn_row() passes the error up. Otherwise,
1014 * returns a null pointer after iteration is complete.
1016 * 'cb' may insert new txn_rows and new txn_tables into 'txn'. It may delete
1017 * the txn_row that it is passed in, or txn_rows in txn_tables other than the
1018 * one passed to 'cb'. It may *not* delete txn_rows other than the one passed
1019 * in within the same txn_table. It may *not* delete any txn_tables. As long
1020 * as these rules are followed, 'cb' will be called exactly once for each
1021 * txn_row in 'txn', even those added by 'cb'.
1023 * (Even though 'cb' is not allowed to delete some txn_rows, it can still
1024 * delete any actual row by clearing a txn_row's 'new' member.)
1026 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
1027 for_each_txn_row(struct ovsdb_txn *txn,
1028 struct ovsdb_error *(*cb)(struct ovsdb_txn *,
1029 struct ovsdb_txn_row *))
1036 struct ovsdb_txn_table *t, *next_txn_table;
1039 LIST_FOR_EACH_SAFE (t, next_txn_table, node, &txn->txn_tables) {
1040 if (t->serial != serial) {
1045 while (t->n_processed < hmap_count(&t->txn_rows)) {
1046 struct ovsdb_txn_row *r, *next_txn_row;
1048 HMAP_FOR_EACH_SAFE (r, next_txn_row, hmap_node, &t->txn_rows) {
1049 if (r->serial != serial) {
1050 struct ovsdb_error *error;
1063 if (hmap_is_empty(&t->txn_rows)) {
1064 /* Table is empty. Drop it. */
1065 ovsdb_txn_table_destroy(t);