-/* Copyright (c) 2009 Nicira Networks
+/* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include "transaction.h"
-#include <assert.h>
-
+#include "bitmap.h"
#include "dynamic-string.h"
#include "hash.h"
#include "hmap.h"
#include "json.h"
+#include "list.h"
#include "ovsdb-error.h"
#include "ovsdb.h"
#include "row.h"
#include "table.h"
+#include "perf-counter.h"
#include "uuid.h"
struct ovsdb_txn {
struct ovsdb *db;
- struct hmap txn_tables; /* Contains "struct ovsdb_txn_table"s. */
+ struct ovs_list txn_tables; /* Contains "struct ovsdb_txn_table"s. */
struct ds comment;
};
/* A table modified by a transaction. */
struct ovsdb_txn_table {
- struct hmap_node hmap_node; /* Element in ovsdb_txn's txn_tables hmap. */
+ struct ovs_list node; /* Element in ovsdb_txn's txn_tables list. */
struct ovsdb_table *table;
struct hmap txn_rows; /* Contains "struct ovsdb_txn_row"s. */
+
+ /* This has the same form as the 'indexes' member of struct ovsdb_table,
+ * but it is only used or updated at transaction commit time, from
+ * check_index_uniqueness(). */
+ struct hmap *txn_indexes;
+
+ /* Used by for_each_txn_row(). */
+ unsigned int serial; /* Serial number of in-progress iteration. */
+ unsigned int n_processed; /* Number of rows processed. */
};
/* A row modified by the transaction:
*
* - A row modified by a transaction will have non-null 'old' and 'new'.
*
- * - 'old' and 'new' both null is invalid. It would indicate that a row
- * was added then deleted within a single transaction, but we instead
- * handle that case by deleting the txn_row entirely.
+ * - 'old' and 'new' both null indicates that a row was added then deleted
+ * within a single transaction. Most of the time we instead delete the
+ * ovsdb_txn_row entirely, but inside a for_each_txn_row() callback
+ * there are restrictions that sometimes mean we have to leave the
+ * ovsdb_txn_row in place.
*/
struct ovsdb_txn_row {
struct hmap_node hmap_node; /* In ovsdb_txn_table's txn_rows hmap. */
struct ovsdb_row *old; /* The old row. */
struct ovsdb_row *new; /* The new row. */
+ size_t n_refs; /* Number of remaining references. */
+
+ /* These members are the same as the corresponding members of 'old' or
+ * 'new'. They are present here for convenience and because occasionally
+ * there can be an ovsdb_txn_row where both 'old' and 'new' are NULL. */
+ struct uuid uuid;
+ struct ovsdb_table *table;
+
+ /* Used by for_each_txn_row(). */
+ unsigned int serial; /* Serial number of in-progress commit. */
+
+ unsigned long changed[]; /* Bits set to 1 for columns that changed. */
};
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *r);
+static void ovsdb_txn_row_prefree(struct ovsdb_txn_row *);
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+for_each_txn_row(struct ovsdb_txn *txn,
+ struct ovsdb_error *(*)(struct ovsdb_txn *,
+ struct ovsdb_txn_row *));
+
+/* Used by for_each_txn_row() to track tables and rows that have been
+ * processed. */
+static unsigned int serial;
+
struct ovsdb_txn *
ovsdb_txn_create(struct ovsdb *db)
{
struct ovsdb_txn *txn = xmalloc(sizeof *txn);
txn->db = db;
- hmap_init(&txn->txn_tables);
+ list_init(&txn->txn_tables);
ds_init(&txn->comment);
return txn;
}
static void
-ovsdb_txn_destroy(struct ovsdb_txn *txn, void (*cb)(struct ovsdb_txn_row *))
+ovsdb_txn_free(struct ovsdb_txn *txn)
{
- struct ovsdb_txn_table *txn_table, *next_txn_table;
-
- HMAP_FOR_EACH_SAFE (txn_table, next_txn_table,
- struct ovsdb_txn_table, hmap_node, &txn->txn_tables)
- {
- struct ovsdb_txn_row *txn_row, *next_txn_row;
-
- HMAP_FOR_EACH_SAFE (txn_row, next_txn_row,
- struct ovsdb_txn_row, hmap_node,
- &txn_table->txn_rows)
- {
- if (txn_row->old) {
- txn_row->old->txn_row = NULL;
- }
- if (txn_row->new) {
- txn_row->new->txn_row = NULL;
- }
- cb(txn_row);
- free(txn_row);
- }
-
- hmap_destroy(&txn_table->txn_rows);
- free(txn_table);
- }
- hmap_destroy(&txn->txn_tables);
+ ovs_assert(list_is_empty(&txn->txn_tables));
ds_destroy(&txn->comment);
free(txn);
}
-static void
-ovsdb_txn_row_abort(struct ovsdb_txn_row *txn_row)
+static struct ovsdb_error *
+ovsdb_txn_row_abort(struct ovsdb_txn *txn OVS_UNUSED,
+ struct ovsdb_txn_row *txn_row)
{
struct ovsdb_row *old = txn_row->old;
struct ovsdb_row *new = txn_row->new;
+ ovsdb_txn_row_prefree(txn_row);
if (!old) {
- hmap_remove(&new->table->rows, &new->hmap_node);
+ if (new) {
+ hmap_remove(&new->table->rows, &new->hmap_node);
+ }
} else if (!new) {
hmap_insert(&old->table->rows, &old->hmap_node, ovsdb_row_hash(old));
} else {
hmap_replace(&new->table->rows, &new->hmap_node, &old->hmap_node);
}
ovsdb_row_destroy(new);
+ free(txn_row);
+
+ return NULL;
+}
+
+/* Returns the offset in bytes from the start of an ovsdb_row for 'table' to
+ * the hmap_node for the index numbered 'i'. */
+static size_t
+ovsdb_row_index_offset__(const struct ovsdb_table *table, size_t i)
+{
+ size_t n_fields = shash_count(&table->schema->columns);
+ return (offsetof(struct ovsdb_row, fields)
+ + n_fields * sizeof(struct ovsdb_datum)
+ + i * sizeof(struct hmap_node));
+}
+
+/* Returns the hmap_node in 'row' for the index numbered 'i'. */
+static struct hmap_node *
+ovsdb_row_get_index_node(struct ovsdb_row *row, size_t i)
+{
+ return (void *) ((char *) row + ovsdb_row_index_offset__(row->table, i));
+}
+
+/* Returns the ovsdb_row given 'index_node', which is a pointer to that row's
+ * hmap_node for the index numbered 'i' within 'table'. */
+static struct ovsdb_row *
+ovsdb_row_from_index_node(struct hmap_node *index_node,
+ const struct ovsdb_table *table, size_t i)
+{
+ return (void *) ((char *) index_node - ovsdb_row_index_offset__(table, i));
}
void
ovsdb_txn_abort(struct ovsdb_txn *txn)
{
- ovsdb_txn_destroy(txn, ovsdb_txn_row_abort);
+ ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_abort));
+ ovsdb_txn_free(txn);
}
-static void
-ovsdb_txn_row_commit(struct ovsdb_txn_row *txn_row)
+static struct ovsdb_txn_row *
+find_txn_row(const struct ovsdb_table *table, const struct uuid *uuid)
{
+ struct ovsdb_txn_row *txn_row;
+
+ if (!table->txn_table) {
+ return NULL;
+ }
+
+ HMAP_FOR_EACH_WITH_HASH (txn_row, hmap_node,
+ uuid_hash(uuid), &table->txn_table->txn_rows) {
+ if (uuid_equals(uuid, &txn_row->uuid)) {
+ return txn_row;
+ }
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_txn_row *
+find_or_make_txn_row(struct ovsdb_txn *txn, const struct ovsdb_table *table,
+ const struct uuid *uuid)
+{
+ struct ovsdb_txn_row *txn_row = find_txn_row(table, uuid);
+ if (!txn_row) {
+ const struct ovsdb_row *row = ovsdb_table_get_row(table, uuid);
+ if (row) {
+ txn_row = ovsdb_txn_row_modify(txn, row)->txn_row;
+ }
+ }
+ return txn_row;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+ovsdb_txn_adjust_atom_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
+ const struct ovsdb_column *c,
+ const struct ovsdb_base_type *base,
+ const union ovsdb_atom *atoms, unsigned int n,
+ int delta)
+{
+ const struct ovsdb_table *table;
+ unsigned int i;
+
+ if (!ovsdb_base_type_is_strong_ref(base)) {
+ return NULL;
+ }
+
+ table = base->u.uuid.refTable;
+ for (i = 0; i < n; i++) {
+ const struct uuid *uuid = &atoms[i].uuid;
+ struct ovsdb_txn_row *txn_row;
+
+ if (uuid_equals(uuid, ovsdb_row_get_uuid(r))) {
+ /* Self-references don't count. */
+ continue;
+ }
+
+ txn_row = find_or_make_txn_row(txn, table, uuid);
+ if (!txn_row) {
+ return ovsdb_error("referential integrity violation",
+ "Table %s column %s row "UUID_FMT" "
+ "references nonexistent row "UUID_FMT" in "
+ "table %s.",
+ r->table->schema->name, c->name,
+ UUID_ARGS(ovsdb_row_get_uuid(r)),
+ UUID_ARGS(uuid), table->schema->name);
+ }
+ txn_row->n_refs += delta;
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+ovsdb_txn_adjust_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *r,
+ const struct ovsdb_column *column, int delta)
+{
+ const struct ovsdb_datum *field = &r->fields[column->index];
+ struct ovsdb_error *error;
+
+ error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.key,
+ field->keys, field->n, delta);
+ if (!error) {
+ error = ovsdb_txn_adjust_atom_refs(txn, r, column, &column->type.value,
+ field->values, field->n, delta);
+ }
+ return error;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+update_row_ref_count(struct ovsdb_txn *txn, struct ovsdb_txn_row *r)
+{
+ struct ovsdb_table *table = r->table;
+ struct shash_node *node;
+
+ SHASH_FOR_EACH (node, &table->schema->columns) {
+ const struct ovsdb_column *column = node->data;
+ struct ovsdb_error *error;
+
+ if (r->old) {
+ error = ovsdb_txn_adjust_row_refs(txn, r->old, column, -1);
+ if (error) {
+ return OVSDB_WRAP_BUG("error decreasing refcount", error);
+ }
+ }
+ if (r->new) {
+ error = ovsdb_txn_adjust_row_refs(txn, r->new, column, 1);
+ if (error) {
+ return error;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+check_ref_count(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *r)
+{
+ if (r->new || !r->n_refs) {
+ return NULL;
+ } else {
+ return ovsdb_error("referential integrity violation",
+ "cannot delete %s row "UUID_FMT" because "
+ "of %"PRIuSIZE" remaining reference(s)",
+ r->table->schema->name, UUID_ARGS(&r->uuid),
+ r->n_refs);
+ }
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+delete_row_refs(struct ovsdb_txn *txn, const struct ovsdb_row *row,
+ const struct ovsdb_base_type *base,
+ const union ovsdb_atom *atoms, unsigned int n)
+{
+ const struct ovsdb_table *table;
+ unsigned int i;
+
+ if (!ovsdb_base_type_is_strong_ref(base)) {
+ return NULL;
+ }
+
+ table = base->u.uuid.refTable;
+ for (i = 0; i < n; i++) {
+ const struct uuid *uuid = &atoms[i].uuid;
+ struct ovsdb_txn_row *txn_row;
+
+ if (uuid_equals(uuid, ovsdb_row_get_uuid(row))) {
+ /* Self-references don't count. */
+ continue;
+ }
+
+ txn_row = find_or_make_txn_row(txn, table, uuid);
+ if (!txn_row) {
+ return OVSDB_BUG("strong ref target missing");
+ } else if (!txn_row->n_refs) {
+ return OVSDB_BUG("strong ref target has zero n_refs");
+ } else if (!txn_row->new) {
+ return OVSDB_BUG("deleted strong ref target");
+ }
+
+ if (--txn_row->n_refs == 0) {
+ struct ovsdb_error *error = delete_garbage_row(txn, txn_row);
+ if (error) {
+ return error;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+delete_garbage_row(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
+{
+ struct shash_node *node;
+ struct ovsdb_row *row;
+
+ if (txn_row->table->schema->is_root) {
+ return NULL;
+ }
+
+ row = txn_row->new;
+ txn_row->new = NULL;
+ hmap_remove(&txn_row->table->rows, &row->hmap_node);
+ SHASH_FOR_EACH (node, &txn_row->table->schema->columns) {
+ const struct ovsdb_column *column = node->data;
+ const struct ovsdb_datum *field = &row->fields[column->index];
+ struct ovsdb_error *error;
+
+ error = delete_row_refs(txn, row,
+ &column->type.key, field->keys, field->n);
+ if (error) {
+ return error;
+ }
+
+ error = delete_row_refs(txn, row,
+ &column->type.value, field->values, field->n);
+ if (error) {
+ return error;
+ }
+ }
+ ovsdb_row_destroy(row);
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+collect_garbage(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
+{
+ if (txn_row->new && !txn_row->n_refs) {
+ return delete_garbage_row(txn, txn_row);
+ }
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+update_ref_counts(struct ovsdb_txn *txn)
+{
+ struct ovsdb_error *error;
+
+ error = for_each_txn_row(txn, update_row_ref_count);
+ if (error) {
+ return error;
+ }
+
+ return for_each_txn_row(txn, check_ref_count);
+}
+
+static struct ovsdb_error *
+ovsdb_txn_row_commit(struct ovsdb_txn *txn OVS_UNUSED,
+ struct ovsdb_txn_row *txn_row)
+{
+ size_t n_indexes = txn_row->table->schema->n_indexes;
+
+ if (txn_row->old) {
+ size_t i;
+
+ for (i = 0; i < n_indexes; i++) {
+ struct hmap_node *node = ovsdb_row_get_index_node(txn_row->old, i);
+ hmap_remove(&txn_row->table->indexes[i], node);
+ }
+ }
+ if (txn_row->new) {
+ size_t i;
+
+ for (i = 0; i < n_indexes; i++) {
+ struct hmap_node *node = ovsdb_row_get_index_node(txn_row->new, i);
+ hmap_insert(&txn_row->table->indexes[i], node, node->hash);
+ }
+ }
+
+ ovsdb_txn_row_prefree(txn_row);
+ if (txn_row->new) {
+ txn_row->new->n_refs = txn_row->n_refs;
+ }
ovsdb_row_destroy(txn_row->old);
+ free(txn_row);
+
+ return NULL;
}
-struct ovsdb_error *
-ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
+static void
+add_weak_ref(struct ovsdb_txn *txn,
+ const struct ovsdb_row *src_, const struct ovsdb_row *dst_)
+{
+ struct ovsdb_row *src = CONST_CAST(struct ovsdb_row *, src_);
+ struct ovsdb_row *dst = CONST_CAST(struct ovsdb_row *, dst_);
+ struct ovsdb_weak_ref *weak;
+
+ if (src == dst) {
+ return;
+ }
+
+ dst = ovsdb_txn_row_modify(txn, dst);
+
+ if (!list_is_empty(&dst->dst_refs)) {
+ /* Omit duplicates. */
+ weak = CONTAINER_OF(list_back(&dst->dst_refs),
+ struct ovsdb_weak_ref, dst_node);
+ if (weak->src == src) {
+ return;
+ }
+ }
+
+ weak = xmalloc(sizeof *weak);
+ weak->src = src;
+ list_push_back(&dst->dst_refs, &weak->dst_node);
+ list_push_back(&src->src_refs, &weak->src_node);
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+assess_weak_refs(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
+{
+ struct ovsdb_table *table;
+ struct shash_node *node;
+
+ if (txn_row->old) {
+ /* Mark rows that have weak references to 'txn_row' as modified, so
+ * that their weak references will get reassessed. */
+ struct ovsdb_weak_ref *weak, *next;
+
+ LIST_FOR_EACH_SAFE (weak, next, dst_node, &txn_row->old->dst_refs) {
+ if (!weak->src->txn_row) {
+ ovsdb_txn_row_modify(txn, weak->src);
+ }
+ }
+ }
+
+ if (!txn_row->new) {
+ /* We don't have to do anything about references that originate at
+ * 'txn_row', because ovsdb_row_destroy() will remove those weak
+ * references. */
+ return NULL;
+ }
+
+ table = txn_row->table;
+ SHASH_FOR_EACH (node, &table->schema->columns) {
+ const struct ovsdb_column *column = node->data;
+ struct ovsdb_datum *datum = &txn_row->new->fields[column->index];
+ unsigned int orig_n, i;
+ bool zero = false;
+
+ orig_n = datum->n;
+
+ if (ovsdb_base_type_is_weak_ref(&column->type.key)) {
+ for (i = 0; i < datum->n; ) {
+ const struct ovsdb_row *row;
+
+ row = ovsdb_table_get_row(column->type.key.u.uuid.refTable,
+ &datum->keys[i].uuid);
+ if (row) {
+ add_weak_ref(txn, txn_row->new, row);
+ i++;
+ } else {
+ if (uuid_is_zero(&datum->keys[i].uuid)) {
+ zero = true;
+ }
+ ovsdb_datum_remove_unsafe(datum, i, &column->type);
+ }
+ }
+ }
+
+ if (ovsdb_base_type_is_weak_ref(&column->type.value)) {
+ for (i = 0; i < datum->n; ) {
+ const struct ovsdb_row *row;
+
+ row = ovsdb_table_get_row(column->type.value.u.uuid.refTable,
+ &datum->values[i].uuid);
+ if (row) {
+ add_weak_ref(txn, txn_row->new, row);
+ i++;
+ } else {
+ if (uuid_is_zero(&datum->values[i].uuid)) {
+ zero = true;
+ }
+ ovsdb_datum_remove_unsafe(datum, i, &column->type);
+ }
+ }
+ }
+
+ if (datum->n != orig_n) {
+ bitmap_set1(txn_row->changed, column->index);
+ ovsdb_datum_sort_assert(datum, column->type.key.type);
+ if (datum->n < column->type.n_min) {
+ const struct uuid *row_uuid = ovsdb_row_get_uuid(txn_row->new);
+ if (zero && !txn_row->old) {
+ return ovsdb_error(
+ "constraint violation",
+ "Weak reference column \"%s\" in \"%s\" row "UUID_FMT
+ " (inserted within this transaction) contained "
+ "all-zeros UUID (probably as the default value for "
+ "this column) but deleting this value caused a "
+ "constraint volation because this column is not "
+ "allowed to be empty.", column->name,
+ table->schema->name, UUID_ARGS(row_uuid));
+ } else {
+ return ovsdb_error(
+ "constraint violation",
+ "Deletion of %u weak reference(s) to deleted (or "
+ "never-existing) rows from column \"%s\" in \"%s\" "
+ "row "UUID_FMT" %scaused this column to become empty, "
+ "but constraints on this column disallow an "
+ "empty column.",
+ orig_n - datum->n, column->name, table->schema->name,
+ UUID_ARGS(row_uuid),
+ (txn_row->old
+ ? ""
+ : "(inserted within this transaction) "));
+ }
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+determine_changes(struct ovsdb_txn *txn, struct ovsdb_txn_row *txn_row)
+{
+ struct ovsdb_table *table = txn_row->table;
+
+ if (txn_row->old && txn_row->new) {
+ struct shash_node *node;
+ bool changed = false;
+
+ SHASH_FOR_EACH (node, &table->schema->columns) {
+ const struct ovsdb_column *column = node->data;
+ const struct ovsdb_type *type = &column->type;
+ unsigned int idx = column->index;
+
+ if (!ovsdb_datum_equals(&txn_row->old->fields[idx],
+ &txn_row->new->fields[idx],
+ type)) {
+ bitmap_set1(txn_row->changed, idx);
+ changed = true;
+ }
+ }
+
+ if (!changed) {
+ /* Nothing actually changed in this row, so drop it. */
+ ovsdb_txn_row_abort(txn, txn_row);
+ }
+ } else {
+ bitmap_set_multiple(txn_row->changed, 0,
+ shash_count(&table->schema->columns), 1);
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+check_max_rows(struct ovsdb_txn *txn)
+{
+ struct ovsdb_txn_table *t;
+
+ LIST_FOR_EACH (t, node, &txn->txn_tables) {
+ size_t n_rows = hmap_count(&t->table->rows);
+ unsigned int max_rows = t->table->schema->max_rows;
+
+ if (n_rows > max_rows) {
+ return ovsdb_error("constraint violation",
+ "transaction causes \"%s\" table to contain "
+ "%"PRIuSIZE" rows, greater than the schema-defined "
+ "limit of %u row(s)",
+ t->table->schema->name, n_rows, max_rows);
+ }
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_row *
+ovsdb_index_search(struct hmap *index, struct ovsdb_row *row, size_t i,
+ uint32_t hash)
+{
+ const struct ovsdb_table *table = row->table;
+ const struct ovsdb_column_set *columns = &table->schema->indexes[i];
+ struct hmap_node *node;
+
+ for (node = hmap_first_with_hash(index, hash); node;
+ node = hmap_next_with_hash(node)) {
+ struct ovsdb_row *irow = ovsdb_row_from_index_node(node, table, i);
+ if (ovsdb_row_equal_columns(row, irow, columns)) {
+ return irow;
+ }
+ }
+
+ return NULL;
+}
+
+static void
+duplicate_index_row__(const struct ovsdb_column_set *index,
+ const struct ovsdb_row *row,
+ const char *title,
+ struct ds *out)
+{
+ size_t n_columns = shash_count(&row->table->schema->columns);
+
+ ds_put_format(out, "%s row, with UUID "UUID_FMT", ",
+ title, UUID_ARGS(ovsdb_row_get_uuid(row)));
+ if (!row->txn_row
+ || bitmap_scan(row->txn_row->changed, 1, 0, n_columns) == n_columns) {
+ ds_put_cstr(out, "existed in the database before this "
+ "transaction and was not modified by the transaction.");
+ } else if (!row->txn_row->old) {
+ ds_put_cstr(out, "was inserted by this transaction.");
+ } else if (ovsdb_row_equal_columns(row->txn_row->old,
+ row->txn_row->new, index)) {
+ ds_put_cstr(out, "existed in the database before this "
+ "transaction, which modified some of the row's columns "
+ "but not any columns in this index.");
+ } else {
+ ds_put_cstr(out, "had the following index values before the "
+ "transaction: ");
+ ovsdb_row_columns_to_string(row->txn_row->old, index, out);
+ ds_put_char(out, '.');
+ }
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+duplicate_index_row(const struct ovsdb_column_set *index,
+ const struct ovsdb_row *a,
+ const struct ovsdb_row *b)
+{
+ struct ovsdb_column_set all_columns;
+ struct ovsdb_error *error;
+ char *index_s;
+ struct ds s;
+
+ /* Put 'a' and 'b' in a predictable order to make error messages
+ * reproducible for testing. */
+ ovsdb_column_set_init(&all_columns);
+ ovsdb_column_set_add_all(&all_columns, a->table);
+ if (ovsdb_row_compare_columns_3way(a, b, &all_columns) < 0) {
+ const struct ovsdb_row *tmp = a;
+ a = b;
+ b = tmp;
+ }
+ ovsdb_column_set_destroy(&all_columns);
+
+ index_s = ovsdb_column_set_to_string(index);
+
+ ds_init(&s);
+ ds_put_format(&s, "Transaction causes multiple rows in \"%s\" table to "
+ "have identical values (", a->table->schema->name);
+ ovsdb_row_columns_to_string(a, index, &s);
+ ds_put_format(&s, ") for index on %s. ", index_s);
+ duplicate_index_row__(index, a, "First", &s);
+ ds_put_cstr(&s, " ");
+ duplicate_index_row__(index, b, "Second", &s);
+
+ free(index_s);
+
+ error = ovsdb_error("constraint violation", "%s", ds_cstr(&s));
+ ds_destroy(&s);
+ return error;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+check_index_uniqueness(struct ovsdb_txn *txn OVS_UNUSED,
+ struct ovsdb_txn_row *txn_row)
+{
+ struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
+ struct ovsdb_table *table = txn_row->table;
+ struct ovsdb_row *row = txn_row->new;
+ size_t i;
+
+ if (!row) {
+ return NULL;
+ }
+
+ for (i = 0; i < table->schema->n_indexes; i++) {
+ const struct ovsdb_column_set *index = &table->schema->indexes[i];
+ struct ovsdb_row *irow;
+ uint32_t hash;
+
+ hash = ovsdb_row_hash_columns(row, index, 0);
+ irow = ovsdb_index_search(&txn_table->txn_indexes[i], row, i, hash);
+ if (irow) {
+ return duplicate_index_row(index, irow, row);
+ }
+
+ irow = ovsdb_index_search(&table->indexes[i], row, i, hash);
+ if (irow && !irow->txn_row) {
+ return duplicate_index_row(index, irow, row);
+ }
+
+ hmap_insert(&txn_table->txn_indexes[i],
+ ovsdb_row_get_index_node(row, i), hash);
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+update_version(struct ovsdb_txn *txn OVS_UNUSED, struct ovsdb_txn_row *txn_row)
+{
+ struct ovsdb_table *table = txn_row->table;
+ size_t n_columns = shash_count(&table->schema->columns);
+
+ if (txn_row->old && txn_row->new
+ && !bitmap_is_all_zeros(txn_row->changed, n_columns)) {
+ bitmap_set1(txn_row->changed, OVSDB_COL_VERSION);
+ uuid_generate(ovsdb_row_get_version_rw(txn_row->new));
+ }
+
+ return NULL;
+}
+
+static struct ovsdb_error *
+ovsdb_txn_commit_(struct ovsdb_txn *txn, bool durable)
{
struct ovsdb_replica *replica;
struct ovsdb_error *error;
- LIST_FOR_EACH (replica, struct ovsdb_replica, node, &txn->db->replicas) {
+ /* Figure out what actually changed, and abort early if the transaction
+ * was really a no-op. */
+ error = for_each_txn_row(txn, determine_changes);
+ if (error) {
+ return OVSDB_WRAP_BUG("can't happen", error);
+ }
+ if (list_is_empty(&txn->txn_tables)) {
+ ovsdb_txn_abort(txn);
+ return NULL;
+ }
+
+ /* Update reference counts and check referential integrity. */
+ error = update_ref_counts(txn);
+ if (error) {
+ ovsdb_txn_abort(txn);
+ return error;
+ }
+
+ /* Delete unreferenced, non-root rows. */
+ error = for_each_txn_row(txn, collect_garbage);
+ if (error) {
+ ovsdb_txn_abort(txn);
+ return OVSDB_WRAP_BUG("can't happen", error);
+ }
+
+ /* Check maximum rows table constraints. */
+ error = check_max_rows(txn);
+ if (error) {
+ ovsdb_txn_abort(txn);
+ return error;
+ }
+
+ /* Check reference counts and remove bad references for "weak" referential
+ * integrity. */
+ error = for_each_txn_row(txn, assess_weak_refs);
+ if (error) {
+ ovsdb_txn_abort(txn);
+ return error;
+ }
+
+ /* Verify that the indexes will still be unique post-transaction. */
+ error = for_each_txn_row(txn, check_index_uniqueness);
+ if (error) {
+ ovsdb_txn_abort(txn);
+ return error;
+ }
+
+ /* Update _version for rows that changed. */
+ error = for_each_txn_row(txn, update_version);
+ if (error) {
+ return OVSDB_WRAP_BUG("can't happen", error);
+ }
+
+ /* Send the commit to each replica. */
+ LIST_FOR_EACH (replica, node, &txn->db->replicas) {
error = (replica->class->commit)(replica, txn, durable);
if (error) {
/* We don't support two-phase commit so only the first replica is
* allowed to report an error. */
- assert(&replica->node == txn->db->replicas.next);
+ ovs_assert(&replica->node == txn->db->replicas.next);
ovsdb_txn_abort(txn);
return error;
}
}
+ /* Finalize commit. */
txn->db->run_triggers = true;
- ovsdb_txn_destroy(txn, ovsdb_txn_row_commit);
+ ovsdb_error_assert(for_each_txn_row(txn, ovsdb_txn_row_commit));
+ ovsdb_txn_free(txn);
+
return NULL;
}
+struct ovsdb_error *
+ovsdb_txn_commit(struct ovsdb_txn *txn, bool durable)
+{
+ struct ovsdb_error *err;
+
+ PERF(__func__, err = ovsdb_txn_commit_(txn, durable));
+ return err;
+}
+
void
ovsdb_txn_for_each_change(const struct ovsdb_txn *txn,
ovsdb_txn_row_cb_func *cb, void *aux)
struct ovsdb_txn_table *t;
struct ovsdb_txn_row *r;
- HMAP_FOR_EACH (t, struct ovsdb_txn_table, hmap_node, &txn->txn_tables) {
- HMAP_FOR_EACH (r, struct ovsdb_txn_row, hmap_node, &t->txn_rows) {
- if (!cb(r->old, r->new, aux)) {
+ LIST_FOR_EACH (t, node, &txn->txn_tables) {
+ HMAP_FOR_EACH (r, hmap_node, &t->txn_rows) {
+ if ((r->old || r->new) && !cb(r->old, r->new, r->changed, aux)) {
break;
}
}
}
static struct ovsdb_txn_table *
-ovsdb_txn_get_txn_table__(struct ovsdb_txn *txn,
- const struct ovsdb_table *table,
- uint32_t hash)
-{
- struct ovsdb_txn_table *txn_table;
-
- HMAP_FOR_EACH_IN_BUCKET (txn_table, struct ovsdb_txn_table, hmap_node,
- hash, &txn->txn_tables) {
- if (txn_table->table == table) {
- return txn_table;
- }
- }
-
- return NULL;
-}
-
-static struct ovsdb_txn_table *
-ovsdb_txn_get_txn_table(struct ovsdb_txn *txn, const struct ovsdb_table *table)
+ovsdb_txn_create_txn_table(struct ovsdb_txn *txn, struct ovsdb_table *table)
{
- return ovsdb_txn_get_txn_table__(txn, table, hash_pointer(table, 0));
-}
-
-static struct ovsdb_txn_table *
-ovsdb_txn_create_txn_table(struct ovsdb_txn *txn,
- struct ovsdb_table *table)
-{
- uint32_t hash = hash_pointer(table, 0);
- struct ovsdb_txn_table *txn_table;
+ if (!table->txn_table) {
+ struct ovsdb_txn_table *txn_table;
+ size_t i;
- txn_table = ovsdb_txn_get_txn_table__(txn, table, hash);
- if (!txn_table) {
- txn_table = xmalloc(sizeof *txn_table);
+ table->txn_table = txn_table = xmalloc(sizeof *table->txn_table);
txn_table->table = table;
hmap_init(&txn_table->txn_rows);
- hmap_insert(&txn->txn_tables, &txn_table->hmap_node, hash);
+ txn_table->serial = serial - 1;
+ txn_table->txn_indexes = xmalloc(table->schema->n_indexes
+ * sizeof *txn_table->txn_indexes);
+ for (i = 0; i < table->schema->n_indexes; i++) {
+ hmap_init(&txn_table->txn_indexes[i]);
+ }
+ list_push_back(&txn->txn_tables, &txn_table->node);
}
- return txn_table;
+ return table->txn_table;
}
static struct ovsdb_txn_row *
-ovsdb_txn_row_create(struct ovsdb_txn_table *txn_table,
- const struct ovsdb_row *old, struct ovsdb_row *new)
+ovsdb_txn_row_create(struct ovsdb_txn *txn, struct ovsdb_table *table,
+ const struct ovsdb_row *old_, struct ovsdb_row *new)
{
- uint32_t hash = ovsdb_row_hash(old ? old : new);
+ const struct ovsdb_row *row = old_ ? old_ : new;
+ struct ovsdb_row *old = CONST_CAST(struct ovsdb_row *, old_);
+ size_t n_columns = shash_count(&table->schema->columns);
+ struct ovsdb_txn_table *txn_table;
struct ovsdb_txn_row *txn_row;
- txn_row = xmalloc(sizeof *txn_row);
- txn_row->old = (struct ovsdb_row *) old;
+ txn_row = xzalloc(offsetof(struct ovsdb_txn_row, changed)
+ + bitmap_n_bytes(n_columns));
+ txn_row->uuid = *ovsdb_row_get_uuid(row);
+ txn_row->table = row->table;
+ txn_row->old = old;
txn_row->new = new;
- hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node, hash);
+ txn_row->n_refs = old ? old->n_refs : 0;
+ txn_row->serial = serial - 1;
+
+ if (old) {
+ old->txn_row = txn_row;
+ }
+ if (new) {
+ new->txn_row = txn_row;
+ }
+
+ txn_table = ovsdb_txn_create_txn_table(txn, table);
+ hmap_insert(&txn_table->txn_rows, &txn_row->hmap_node,
+ ovsdb_row_hash(old ? old : new));
return txn_row;
}
struct ovsdb_row *
ovsdb_txn_row_modify(struct ovsdb_txn *txn, const struct ovsdb_row *ro_row_)
{
- struct ovsdb_row *ro_row = (struct ovsdb_row *) ro_row_;
+ struct ovsdb_row *ro_row = CONST_CAST(struct ovsdb_row *, ro_row_);
if (ro_row->txn_row) {
- assert(ro_row == ro_row->txn_row->new);
+ ovs_assert(ro_row == ro_row->txn_row->new);
return ro_row;
} else {
struct ovsdb_table *table = ro_row->table;
- struct ovsdb_txn_table *txn_table;
struct ovsdb_row *rw_row;
- txn_table = ovsdb_txn_create_txn_table(txn, table);
rw_row = ovsdb_row_clone(ro_row);
- uuid_generate(ovsdb_row_get_version_rw(rw_row));
- rw_row->txn_row = ovsdb_txn_row_create(txn_table, ro_row, rw_row);
+ rw_row->n_refs = ro_row->n_refs;
+ ovsdb_txn_row_create(txn, table, ro_row, rw_row);
hmap_replace(&table->rows, &ro_row->hmap_node, &rw_row->hmap_node);
return rw_row;
{
uint32_t hash = ovsdb_row_hash(row);
struct ovsdb_table *table = row->table;
- struct ovsdb_txn_table *txn_table;
uuid_generate(ovsdb_row_get_version_rw(row));
- txn_table = ovsdb_txn_create_txn_table(txn, table);
- row->txn_row = ovsdb_txn_row_create(txn_table, NULL, row);
+ ovsdb_txn_row_create(txn, table, NULL, row);
hmap_insert(&table->rows, &row->hmap_node, hash);
}
void
ovsdb_txn_row_delete(struct ovsdb_txn *txn, const struct ovsdb_row *row_)
{
- struct ovsdb_row *row = (struct ovsdb_row *) row_;
+ struct ovsdb_row *row = CONST_CAST(struct ovsdb_row *, row_);
struct ovsdb_table *table = row->table;
struct ovsdb_txn_row *txn_row = row->txn_row;
- struct ovsdb_txn_table *txn_table;
hmap_remove(&table->rows, &row->hmap_node);
if (!txn_row) {
- txn_table = ovsdb_txn_create_txn_table(txn, table);
- row->txn_row = ovsdb_txn_row_create(txn_table, row, NULL);
+ ovsdb_txn_row_create(txn, table, row, NULL);
} else {
- assert(txn_row->new == row);
+ ovs_assert(txn_row->new == row);
if (txn_row->old) {
txn_row->new = NULL;
} else {
- txn_table = ovsdb_txn_get_txn_table(txn, table);
- hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
+ hmap_remove(&table->txn_table->txn_rows, &txn_row->hmap_node);
+ free(txn_row);
}
ovsdb_row_destroy(row);
}
{
return txn->comment.length ? ds_cstr_ro(&txn->comment) : NULL;
}
+\f
+static void
+ovsdb_txn_row_prefree(struct ovsdb_txn_row *txn_row)
+{
+ struct ovsdb_txn_table *txn_table = txn_row->table->txn_table;
+
+ txn_table->n_processed--;
+ hmap_remove(&txn_table->txn_rows, &txn_row->hmap_node);
+
+ if (txn_row->old) {
+ txn_row->old->txn_row = NULL;
+ }
+ if (txn_row->new) {
+ txn_row->new->txn_row = NULL;
+ }
+}
+
+static void
+ovsdb_txn_table_destroy(struct ovsdb_txn_table *txn_table)
+{
+ size_t i;
+
+ ovs_assert(hmap_is_empty(&txn_table->txn_rows));
+
+ for (i = 0; i < txn_table->table->schema->n_indexes; i++) {
+ hmap_destroy(&txn_table->txn_indexes[i]);
+ }
+ free(txn_table->txn_indexes);
+
+ txn_table->table->txn_table = NULL;
+ hmap_destroy(&txn_table->txn_rows);
+ list_remove(&txn_table->node);
+ free(txn_table);
+}
+
+/* Calls 'cb' for every txn_row within 'txn'. If 'cb' returns nonnull, this
+ * aborts the iteration and for_each_txn_row() passes the error up. Otherwise,
+ * returns a null pointer after iteration is complete.
+ *
+ * 'cb' may insert new txn_rows and new txn_tables into 'txn'. It may delete
+ * the txn_row that it is passed in, or txn_rows in txn_tables other than the
+ * one passed to 'cb'. It may *not* delete txn_rows other than the one passed
+ * in within the same txn_table. It may *not* delete any txn_tables. As long
+ * as these rules are followed, 'cb' will be called exactly once for each
+ * txn_row in 'txn', even those added by 'cb'.
+ *
+ * (Even though 'cb' is not allowed to delete some txn_rows, it can still
+ * delete any actual row by clearing a txn_row's 'new' member.)
+ */
+static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
+for_each_txn_row(struct ovsdb_txn *txn,
+ struct ovsdb_error *(*cb)(struct ovsdb_txn *,
+ struct ovsdb_txn_row *))
+{
+ bool any_work;
+
+ serial++;
+
+ do {
+ struct ovsdb_txn_table *t, *next_txn_table;
+
+ any_work = false;
+ LIST_FOR_EACH_SAFE (t, next_txn_table, node, &txn->txn_tables) {
+ if (t->serial != serial) {
+ t->serial = serial;
+ t->n_processed = 0;
+ }
+
+ while (t->n_processed < hmap_count(&t->txn_rows)) {
+ struct ovsdb_txn_row *r, *next_txn_row;
+
+ HMAP_FOR_EACH_SAFE (r, next_txn_row, hmap_node, &t->txn_rows) {
+ if (r->serial != serial) {
+ struct ovsdb_error *error;
+
+ r->serial = serial;
+ t->n_processed++;
+ any_work = true;
+
+ error = cb(txn, r);
+ if (error) {
+ return error;
+ }
+ }
+ }
+ }
+ if (hmap_is_empty(&t->txn_rows)) {
+ /* Table is empty. Drop it. */
+ ovsdb_txn_table_destroy(t);
+ }
+ }
+ } while (any_work);
+
+ return NULL;
+}
projects / cascardo / ovs.git / blobdiff