#include "bootstrap/bootstrap.h"
#include "catalog/catalog.h"
#include "catalog/heap.h"
+#include "catalog/namespace.h"
#include "catalog/pg_am.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_authid.h"
XDECLARE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
IndexStmt *stmt = makeNode(IndexStmt);
+ Oid relationId;
do_start();
stmt->initdeferred = false;
stmt->concurrent = false;
- DefineIndex(stmt,
+ /* locks and races need not concern us in bootstrap mode */
+ relationId = RangeVarGetRelid(stmt->relation, NoLock,
+ false);
+
+ DefineIndex(relationId,
+ stmt,
$4,
false,
false,
XDECLARE UNIQUE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
IndexStmt *stmt = makeNode(IndexStmt);
+ Oid relationId;
do_start();
stmt->initdeferred = false;
stmt->concurrent = false;
- DefineIndex(stmt,
+ /* locks and races need not concern us in bootstrap mode */
+ relationId = RangeVarGetRelid(stmt->relation, NoLock,
+ false);
+
+ DefineIndex(relationId,
+ stmt,
$5,
false,
false,
*/
if (deferrable)
{
- RangeVar *heapRel;
CreateTrigStmt *trigger;
- heapRel = makeRangeVar(get_namespace_name(namespaceId),
- pstrdup(RelationGetRelationName(heapRelation)),
- -1);
-
trigger = makeNode(CreateTrigStmt);
trigger->trigname = (constraintType == CONSTRAINT_PRIMARY) ?
"PK_ConstraintTrigger" :
"Unique_ConstraintTrigger";
- trigger->relation = heapRel;
+ trigger->relation = NULL;
trigger->funcname = SystemFuncName("unique_key_recheck");
trigger->args = NIL;
trigger->row = true;
trigger->initdeferred = initdeferred;
trigger->constrrel = NULL;
- (void) CreateTrigger(trigger, NULL, conOid, indexRelationId, true);
+ (void) CreateTrigger(trigger, NULL, RelationGetRelid(heapRelation),
+ InvalidOid, conOid, indexRelationId, true);
}
/*
heap_close(conRel, RowExclusiveLock);
}
+/*
+ * get_constraint_relation_oids
+ * Find the IDs of the relations to which a constraint refers.
+ */
+void
+get_constraint_relation_oids(Oid constraint_oid, Oid *conrelid, Oid *confrelid)
+{
+ HeapTuple tup;
+ Form_pg_constraint con;
+
+ tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraint_oid));
+ if (!HeapTupleIsValid(tup)) /* should not happen */
+ elog(ERROR, "cache lookup failed for constraint %u", constraint_oid);
+ con = (Form_pg_constraint) GETSTRUCT(tup);
+ *conrelid = con->conrelid;
+ *confrelid = con->confrelid;
+ ReleaseSysCache(tup);
+}
+
/*
* get_relation_constraint_oid
* Find a constraint on the specified relation with the specified name.
*/
bool
CheckIndexCompatible(Oid oldId,
- RangeVar *heapRelation,
char *accessMethodName,
List *attributeList,
List *exclusionOpNames)
Datum d;
/* Caller should already have the relation locked in some way. */
- relationId = RangeVarGetRelid(heapRelation, NoLock, false);
+ relationId = IndexGetRelation(oldId, false);
/*
* We can pretend isconstraint = false unconditionally. It only serves to
* DefineIndex
* Creates a new index.
*
+ * 'relationId': the OID of the heap relation on which the index is to be
+ * created
* 'stmt': IndexStmt describing the properties of the new index.
* 'indexRelationId': normally InvalidOid, but during bootstrap can be
* nonzero to specify a preselected OID for the index.
* Returns the OID of the created index.
*/
Oid
-DefineIndex(IndexStmt *stmt,
+DefineIndex(Oid relationId,
+ IndexStmt *stmt,
Oid indexRelationId,
bool is_alter_table,
bool check_rights,
Oid *collationObjectId;
Oid *classObjectId;
Oid accessMethodId;
- Oid relationId;
Oid namespaceId;
Oid tablespaceId;
List *indexColNames;
int n_old_snapshots;
LockRelId heaprelid;
LOCKTAG heaplocktag;
+ LOCKMODE lockmode;
Snapshot snapshot;
int i;
INDEX_MAX_KEYS)));
/*
- * Open heap relation, acquire a suitable lock on it, remember its OID
- *
* Only SELECT ... FOR UPDATE/SHARE are allowed while doing a standard
* index build; but for concurrent builds we allow INSERT/UPDATE/DELETE
* (but not VACUUM).
+ *
+ * NB: Caller is responsible for making sure that relationId refers
+ * to the relation on which the index should be built; except in bootstrap
+ * mode, this will typically require the caller to have already locked
+ * the relation. To avoid lock upgrade hazards, that lock should be at
+ * least as strong as the one we take here.
*/
- rel = heap_openrv(stmt->relation,
- (stmt->concurrent ? ShareUpdateExclusiveLock : ShareLock));
+ lockmode = stmt->concurrent ? ShareUpdateExclusiveLock : ShareLock;
+ rel = heap_open(relationId, lockmode);
relationId = RelationGetRelid(rel);
namespaceId = RelationGetNamespace(rel);
static void validateForeignKeyConstraint(char *conname,
Relation rel, Relation pkrel,
Oid pkindOid, Oid constraintOid);
-static void createForeignKeyTriggers(Relation rel, Constraint *fkconstraint,
+static void createForeignKeyTriggers(Relation rel, Oid refRelOid,
+ Constraint *fkconstraint,
Oid constraintOid, Oid indexOid);
static void ATController(Relation rel, List *cmds, bool recurse, LOCKMODE lockmode);
static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
static void ATExecAlterColumnGenericOptions(Relation rel, const char *colName,
List *options, LOCKMODE lockmode);
static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode);
-static void ATPostAlterTypeParse(Oid oldId, char *cmd,
- List **wqueue, LOCKMODE lockmode, bool rewrite);
+static void ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId,
+ char *cmd, List **wqueue, LOCKMODE lockmode,
+ bool rewrite);
static void TryReuseIndex(Oid oldId, IndexStmt *stmt);
static void TryReuseForeignKey(Oid oldId, Constraint *con);
static void change_owner_fix_column_acls(Oid relationOid,
/* The IndexStmt has already been through transformIndexStmt */
- new_index = DefineIndex(stmt,
+ new_index = DefineIndex(RelationGetRelid(rel),
+ stmt,
InvalidOid, /* no predefined OID */
true, /* is_alter_table */
check_rights,
* table; trying to start with a lesser lock will just create a risk of
* deadlock.)
*/
- pkrel = heap_openrv(fkconstraint->pktable, AccessExclusiveLock);
+ if (OidIsValid(fkconstraint->old_pktable_oid))
+ pkrel = heap_open(fkconstraint->old_pktable_oid, AccessExclusiveLock);
+ else
+ pkrel = heap_openrv(fkconstraint->pktable, AccessExclusiveLock);
/*
* Validity checks (permission checks wait till we have the column
/*
* Create the triggers that will enforce the constraint.
*/
- createForeignKeyTriggers(rel, fkconstraint, constrOid, indexOid);
+ createForeignKeyTriggers(rel, RelationGetRelid(pkrel), fkconstraint,
+ constrOid, indexOid);
/*
* Tell Phase 3 to check that the constraint is satisfied by existing
}
static void
-CreateFKCheckTrigger(RangeVar *myRel, Constraint *fkconstraint,
+CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
Oid constraintOid, Oid indexOid, bool on_insert)
{
CreateTrigStmt *fk_trigger;
*/
fk_trigger = makeNode(CreateTrigStmt);
fk_trigger->trigname = "RI_ConstraintTrigger_c";
- fk_trigger->relation = myRel;
+ fk_trigger->relation = NULL;
fk_trigger->row = true;
fk_trigger->timing = TRIGGER_TYPE_AFTER;
fk_trigger->isconstraint = true;
fk_trigger->deferrable = fkconstraint->deferrable;
fk_trigger->initdeferred = fkconstraint->initdeferred;
- fk_trigger->constrrel = fkconstraint->pktable;
+ fk_trigger->constrrel = NULL;
fk_trigger->args = NIL;
- (void) CreateTrigger(fk_trigger, NULL, constraintOid, indexOid, true);
+ (void) CreateTrigger(fk_trigger, NULL, myRelOid, refRelOid, constraintOid,
+ indexOid, true);
/* Make changes-so-far visible */
CommandCounterIncrement();
* Create the triggers that implement an FK constraint.
*/
static void
-createForeignKeyTriggers(Relation rel, Constraint *fkconstraint,
+createForeignKeyTriggers(Relation rel, Oid refRelOid, Constraint *fkconstraint,
Oid constraintOid, Oid indexOid)
{
- RangeVar *myRel;
+ Oid myRelOid;
CreateTrigStmt *fk_trigger;
- /*
- * Reconstruct a RangeVar for my relation (not passed in, unfortunately).
- */
- myRel = makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
- pstrdup(RelationGetRelationName(rel)),
- -1);
+ myRelOid = RelationGetRelid(rel);
/* Make changes-so-far visible */
CommandCounterIncrement();
*/
fk_trigger = makeNode(CreateTrigStmt);
fk_trigger->trigname = "RI_ConstraintTrigger_a";
- fk_trigger->relation = fkconstraint->pktable;
+ fk_trigger->relation = NULL;
fk_trigger->row = true;
fk_trigger->timing = TRIGGER_TYPE_AFTER;
fk_trigger->events = TRIGGER_TYPE_DELETE;
fk_trigger->columns = NIL;
fk_trigger->whenClause = NULL;
fk_trigger->isconstraint = true;
- fk_trigger->constrrel = myRel;
+ fk_trigger->constrrel = NULL;
switch (fkconstraint->fk_del_action)
{
case FKCONSTR_ACTION_NOACTION:
}
fk_trigger->args = NIL;
- (void) CreateTrigger(fk_trigger, NULL, constraintOid, indexOid, true);
+ (void) CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid, constraintOid,
+ indexOid, true);
/* Make changes-so-far visible */
CommandCounterIncrement();
*/
fk_trigger = makeNode(CreateTrigStmt);
fk_trigger->trigname = "RI_ConstraintTrigger_a";
- fk_trigger->relation = fkconstraint->pktable;
+ fk_trigger->relation = NULL;
fk_trigger->row = true;
fk_trigger->timing = TRIGGER_TYPE_AFTER;
fk_trigger->events = TRIGGER_TYPE_UPDATE;
fk_trigger->columns = NIL;
fk_trigger->whenClause = NULL;
fk_trigger->isconstraint = true;
- fk_trigger->constrrel = myRel;
+ fk_trigger->constrrel = NULL;
switch (fkconstraint->fk_upd_action)
{
case FKCONSTR_ACTION_NOACTION:
}
fk_trigger->args = NIL;
- (void) CreateTrigger(fk_trigger, NULL, constraintOid, indexOid, true);
+ (void) CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid, constraintOid,
+ indexOid, true);
/* Make changes-so-far visible */
CommandCounterIncrement();
* Build and execute CREATE CONSTRAINT TRIGGER statements for the CHECK
* action for both INSERTs and UPDATEs on the referencing table.
*/
- CreateFKCheckTrigger(myRel, fkconstraint, constraintOid, indexOid, true);
- CreateFKCheckTrigger(myRel, fkconstraint, constraintOid, indexOid, false);
+ CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint, constraintOid,
+ indexOid, true);
+ CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint, constraintOid,
+ indexOid, false);
}
/*
* lock on the table the constraint is attached to, and we need to get
* that before dropping. It's safe because the parser won't actually look
* at the catalogs to detect the existing entry.
+ *
+ * We can't rely on the output of deparsing to tell us which relation
+ * to operate on, because concurrent activity might have made the name
+ * resolve differently. Instead, we've got to use the OID of the
+ * constraint or index we're processing to figure out which relation
+ * to operate on.
*/
forboth(oid_item, tab->changedConstraintOids,
def_item, tab->changedConstraintDefs)
- ATPostAlterTypeParse(lfirst_oid(oid_item), (char *) lfirst(def_item),
+ {
+ Oid oldId = lfirst_oid(oid_item);
+ Oid relid;
+ Oid confrelid;
+
+ get_constraint_relation_oids(oldId, &relid, &confrelid);
+ ATPostAlterTypeParse(oldId, relid, confrelid,
+ (char *) lfirst(def_item),
wqueue, lockmode, tab->rewrite);
+ }
forboth(oid_item, tab->changedIndexOids,
def_item, tab->changedIndexDefs)
- ATPostAlterTypeParse(lfirst_oid(oid_item), (char *) lfirst(def_item),
+ {
+ Oid oldId = lfirst_oid(oid_item);
+ Oid relid;
+
+ relid = IndexGetRelation(oldId, false);
+ ATPostAlterTypeParse(oldId, relid, InvalidOid,
+ (char *) lfirst(def_item),
wqueue, lockmode, tab->rewrite);
+ }
/*
* Now we can drop the existing constraints and indexes --- constraints
}
static void
-ATPostAlterTypeParse(Oid oldId, char *cmd,
+ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
List **wqueue, LOCKMODE lockmode, bool rewrite)
{
List *raw_parsetree_list;
List *querytree_list;
ListCell *list_item;
+ Relation rel;
/*
* We expect that we will get only ALTER TABLE and CREATE INDEX
if (IsA(stmt, IndexStmt))
querytree_list = lappend(querytree_list,
- transformIndexStmt((IndexStmt *) stmt,
+ transformIndexStmt(oldRelId,
+ (IndexStmt *) stmt,
cmd));
else if (IsA(stmt, AlterTableStmt))
querytree_list = list_concat(querytree_list,
- transformAlterTableStmt((AlterTableStmt *) stmt,
+ transformAlterTableStmt(oldRelId,
+ (AlterTableStmt *) stmt,
cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
+ /* Caller should already have acquired whatever lock we need. */
+ rel = relation_open(oldRelId, NoLock);
+
/*
* Attach each generated command to the proper place in the work queue.
* Note this could result in creation of entirely new work-queue entries.
foreach(list_item, querytree_list)
{
Node *stm = (Node *) lfirst(list_item);
- Relation rel;
AlteredTableInfo *tab;
switch (nodeTag(stm))
if (!rewrite)
TryReuseIndex(oldId, stmt);
- rel = relation_openrv(stmt->relation, lockmode);
tab = ATGetQueueEntry(wqueue, rel);
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_ReAddIndex;
newcmd->def = (Node *) stmt;
tab->subcmds[AT_PASS_OLD_INDEX] =
lappend(tab->subcmds[AT_PASS_OLD_INDEX], newcmd);
- relation_close(rel, NoLock);
break;
}
case T_AlterTableStmt:
AlterTableStmt *stmt = (AlterTableStmt *) stm;
ListCell *lcmd;
- rel = relation_openrv(stmt->relation, lockmode);
tab = ATGetQueueEntry(wqueue, rel);
foreach(lcmd, stmt->cmds)
{
case AT_AddConstraint:
Assert(IsA(cmd->def, Constraint));
con = (Constraint *) cmd->def;
+ con->old_pktable_oid = refRelId;
/* rewriting neither side of a FK */
if (con->contype == CONSTR_FOREIGN &&
!rewrite && !tab->rewrite)
(int) cmd->subtype);
}
}
- relation_close(rel, NoLock);
break;
}
default:
(int) nodeTag(stm));
}
}
+
+ relation_close(rel, NoLock);
}
/*
TryReuseIndex(Oid oldId, IndexStmt *stmt)
{
if (CheckIndexCompatible(oldId,
- stmt->relation,
stmt->accessMethod,
stmt->indexParams,
stmt->excludeOpNames))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS, relation->relname);
}
+/*
+ * Callback to RangeVarGetRelidExtended(), similar to
+ * RangeVarCallbackOwnsTable() but without checks on the type of the relation.
+ */
+void
+RangeVarCallbackOwnsRelation(const RangeVar *relation,
+ Oid relId, Oid oldRelId, void *arg)
+{
+ HeapTuple tuple;
+
+ /* Nothing to do if the relation was not found. */
+ if (!OidIsValid(relId))
+ return;
+
+ tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
+ if (!HeapTupleIsValid(tuple)) /* should not happen */
+ elog(ERROR, "cache lookup failed for relation %u", relId);
+
+ if (!pg_class_ownercheck(relId, GetUserId()))
+ aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
+ relation->relname);
+
+ if (!allowSystemTableMods &&
+ IsSystemClass((Form_pg_class) GETSTRUCT(tuple)))
+ ereport(ERROR,
+ (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+ errmsg("permission denied: \"%s\" is a system catalog",
+ relation->relname)));
+
+ ReleaseSysCache(tuple);
+}
+
/*
* Common RangeVarGetRelid callback for rename, set schema, and alter table
* processing.
#include "pgstat.h"
#include "rewrite/rewriteManip.h"
#include "storage/bufmgr.h"
+#include "storage/lmgr.h"
#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/builtins.h"
* queryString is the source text of the CREATE TRIGGER command.
* This must be supplied if a whenClause is specified, else it can be NULL.
*
+ * relOid, if nonzero, is the relation on which the trigger should be
+ * created. If zero, the name provided in the statement will be looked up.
+ *
+ * refRelOid, if nonzero, is the relation to which the constraint trigger
+ * refers. If zero, the constraint relation name provided in the statement
+ * will be looked up as needed.
+ *
* constraintOid, if nonzero, says that this trigger is being created
* internally to implement that constraint. A suitable pg_depend entry will
* be made to link the trigger to that constraint. constraintOid is zero when
*/
Oid
CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
- Oid constraintOid, Oid indexOid,
+ Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
bool isInternal)
{
int16 tgtype;
ObjectAddress myself,
referenced;
- rel = heap_openrv(stmt->relation, AccessExclusiveLock);
+ if (OidIsValid(relOid))
+ rel = heap_open(relOid, AccessExclusiveLock);
+ else
+ rel = heap_openrv(stmt->relation, AccessExclusiveLock);
/*
* Triggers must be on tables or views, and there are additional
errmsg("permission denied: \"%s\" is a system catalog",
RelationGetRelationName(rel))));
- if (stmt->isconstraint && stmt->constrrel != NULL)
+ if (stmt->isconstraint)
{
/*
* We must take a lock on the target relation to protect against
* might end up creating a pg_constraint entry referencing a
* nonexistent table.
*/
- constrrelid = RangeVarGetRelid(stmt->constrrel, AccessShareLock, false);
+ if (OidIsValid(refRelOid))
+ {
+ LockRelationOid(refRelOid, AccessShareLock);
+ constrrelid = refRelOid;
+ }
+ else if (stmt->constrrel != NULL)
+ constrrelid = RangeVarGetRelid(stmt->constrrel, AccessShareLock,
+ false);
}
/* permission checks */
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("trigger \"%s\" for relation \"%s\" already exists",
- trigname, stmt->relation->relname)));
+ trigname, RelationGetRelationName(rel))));
}
systable_endscan(tgscan);
}
COPY_SCALAR_FIELD(fk_upd_action);
COPY_SCALAR_FIELD(fk_del_action);
COPY_NODE_FIELD(old_conpfeqop);
+ COPY_SCALAR_FIELD(old_pktable_oid);
COPY_SCALAR_FIELD(skip_validation);
COPY_SCALAR_FIELD(initially_valid);
COMPARE_SCALAR_FIELD(fk_upd_action);
COMPARE_SCALAR_FIELD(fk_del_action);
COMPARE_NODE_FIELD(old_conpfeqop);
+ COMPARE_SCALAR_FIELD(old_pktable_oid);
COMPARE_SCALAR_FIELD(skip_validation);
COMPARE_SCALAR_FIELD(initially_valid);
WRITE_CHAR_FIELD(fk_upd_action);
WRITE_CHAR_FIELD(fk_del_action);
WRITE_NODE_FIELD(old_conpfeqop);
+ WRITE_OID_FIELD(old_pktable_oid);
WRITE_BOOL_FIELD(skip_validation);
WRITE_BOOL_FIELD(initially_valid);
break;
* a predicate expression. There are several code paths that create indexes
* without bothering to call this, because they know they don't have any
* such expressions to deal with.
+ *
+ * To avoid race conditions, it's important that this function rely only on
+ * the passed-in relid (and not on stmt->relation) to determine the target
+ * relation.
*/
IndexStmt *
-transformIndexStmt(IndexStmt *stmt, const char *queryString)
+transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
{
- Relation rel;
ParseState *pstate;
RangeTblEntry *rte;
ListCell *l;
+ Relation rel;
/*
* We must not scribble on the passed-in IndexStmt, so copy it. (This is
*/
stmt = (IndexStmt *) copyObject(stmt);
- /*
- * Open the parent table with appropriate locking. We must do this
- * because addRangeTableEntry() would acquire only AccessShareLock,
- * leaving DefineIndex() needing to do a lock upgrade with consequent risk
- * of deadlock. Make sure this stays in sync with the type of lock
- * DefineIndex() wants. If we are being called by ALTER TABLE, we will
- * already hold a higher lock.
- */
- rel = heap_openrv(stmt->relation,
- (stmt->concurrent ? ShareUpdateExclusiveLock : ShareLock));
-
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification.
+ * to its fields without qualification. Caller is responsible for locking
+ * relation, but we still need to open it.
*/
- rte = addRangeTableEntry(pstate, stmt->relation, NULL, false, true);
+ rel = relation_open(relid, NoLock);
+ rte = addRangeTableEntryForRelation(pstate, rel, NULL, false, true);
/* no to join list, yes to namespaces */
addRTEtoQuery(pstate, rte, false, true, true);
free_parsestate(pstate);
- /* Close relation, but keep the lock */
+ /* Close relation */
heap_close(rel, NoLock);
return stmt;
* Returns a List of utility commands to be done in sequence. One of these
* will be the transformed AlterTableStmt, but there may be additional actions
* to be done before and after the actual AlterTable() call.
+ *
+ * To avoid race conditions, it's important that this function rely only on
+ * the passed-in relid (and not on stmt->relation) to determine the target
+ * relation.
*/
List *
-transformAlterTableStmt(AlterTableStmt *stmt, const char *queryString)
+transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
+ const char *queryString)
{
Relation rel;
ParseState *pstate;
List *newcmds = NIL;
bool skipValidation = true;
AlterTableCmd *newcmd;
- LOCKMODE lockmode;
/*
* We must not scribble on the passed-in AlterTableStmt, so copy it. (This
*/
stmt = (AlterTableStmt *) copyObject(stmt);
- /*
- * Determine the appropriate lock level for this list of subcommands.
- */
- lockmode = AlterTableGetLockLevel(stmt->cmds);
-
- /*
- * Acquire appropriate lock on the target relation, which will be held
- * until end of transaction. This ensures any decisions we make here
- * based on the state of the relation will still be good at execution. We
- * must get lock now because execution will later require it; taking a
- * lower grade lock now and trying to upgrade later risks deadlock. Any
- * new commands we add after this must not upgrade the lock level
- * requested here.
- */
- rel = relation_openrv_extended(stmt->relation, lockmode, stmt->missing_ok);
- if (rel == NULL)
- {
- /* this message is consistent with relation_openrv */
- ereport(NOTICE,
- (errmsg("relation \"%s\" does not exist, skipping",
- stmt->relation->relname)));
- return NIL;
- }
+ /* Caller is responsible for locking the relation */
+ rel = relation_open(relid, NoLock);
/* Set up pstate and CreateStmtContext */
pstate = make_parsestate(NULL);
IndexStmt *idxstmt = (IndexStmt *) lfirst(l);
Assert(IsA(idxstmt, IndexStmt));
- idxstmt = transformIndexStmt(idxstmt, queryString);
+ idxstmt = transformIndexStmt(relid, idxstmt, queryString);
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = OidIsValid(idxstmt->indexOid) ? AT_AddIndexConstraint : AT_AddIndex;
newcmd->def = (Node *) idxstmt;
newcmds = lappend(newcmds, newcmd);
}
- /* Close rel but keep lock */
+ /* Close rel */
relation_close(rel, NoLock);
/*
static void ExecDropStmt(DropStmt *stmt, bool isTopLevel);
-/*
- * Verify user has ownership of specified relation, else ereport.
- *
- * If noCatalogs is true then we also deny access to system catalogs,
- * except when allowSystemTableMods is true.
- */
-void
-CheckRelationOwnership(RangeVar *rel, bool noCatalogs)
-{
- Oid relOid;
- HeapTuple tuple;
-
- /*
- * XXX: This is unsafe in the presence of concurrent DDL, since it is
- * called before acquiring any lock on the target relation. However,
- * locking the target relation (especially using something like
- * AccessExclusiveLock) before verifying that the user has permissions is
- * not appealing either.
- */
- relOid = RangeVarGetRelid(rel, NoLock, false);
-
- tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
- if (!HeapTupleIsValid(tuple)) /* should not happen */
- elog(ERROR, "cache lookup failed for relation %u", relOid);
-
- if (!pg_class_ownercheck(relOid, GetUserId()))
- aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
- rel->relname);
-
- if (noCatalogs)
- {
- if (!allowSystemTableMods &&
- IsSystemClass((Form_pg_class) GETSTRUCT(tuple)))
- ereport(ERROR,
- (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
- errmsg("permission denied: \"%s\" is a system catalog",
- rel->relname)));
- }
-
- ReleaseSysCache(tuple);
-}
-
-
/*
* CommandIsReadOnly: is an executable query read-only?
*
if (OidIsValid(relid))
{
/* Run parse analysis ... */
- stmts = transformAlterTableStmt(atstmt, queryString);
+ stmts = transformAlterTableStmt(relid, atstmt,
+ queryString);
/* ... and do it */
foreach(l, stmts)
case T_IndexStmt: /* CREATE INDEX */
{
IndexStmt *stmt = (IndexStmt *) parsetree;
+ Oid relid;
+ LOCKMODE lockmode;
if (stmt->concurrent)
PreventTransactionChain(isTopLevel,
"CREATE INDEX CONCURRENTLY");
- CheckRelationOwnership(stmt->relation, true);
+ /*
+ * Look up the relation OID just once, right here at the
+ * beginning, so that we don't end up repeating the name
+ * lookup later and latching onto a different relation
+ * partway through. To avoid lock upgrade hazards, it's
+ * important that we take the strongest lock that will
+ * eventually be needed here, so the lockmode calculation
+ * needs to match what DefineIndex() does.
+ */
+ lockmode = stmt->concurrent ? ShareUpdateExclusiveLock
+ : ShareLock;
+ relid =
+ RangeVarGetRelidExtended(stmt->relation, lockmode,
+ false, false,
+ RangeVarCallbackOwnsRelation,
+ NULL);
/* Run parse analysis ... */
- stmt = transformIndexStmt(stmt, queryString);
+ stmt = transformIndexStmt(relid, stmt, queryString);
/* ... and do it */
- DefineIndex(stmt,
+ DefineIndex(relid, /* OID of heap relation */
+ stmt,
InvalidOid, /* no predefined OID */
false, /* is_alter_table */
true, /* check_rights */
case T_CreateTrigStmt:
(void) CreateTrigger((CreateTrigStmt *) parsetree, queryString,
- InvalidOid, InvalidOid, false);
+ InvalidOid, InvalidOid, InvalidOid,
+ InvalidOid, false);
break;
case T_CreatePLangStmt:
extern void AlterConstraintNamespaces(Oid ownerId, Oid oldNspId,
Oid newNspId, bool isType, ObjectAddresses *objsMoved);
+extern void get_constraint_relation_oids(Oid constraint_oid, Oid *conrelid, Oid *confrelid);
extern Oid get_relation_constraint_oid(Oid relid, const char *conname, bool missing_ok);
extern Oid get_domain_constraint_oid(Oid typid, const char *conname, bool missing_ok);
extern void RemoveObjects(DropStmt *stmt);
/* commands/indexcmds.c */
-extern Oid DefineIndex(IndexStmt *stmt,
+extern Oid DefineIndex(Oid relationId,
+ IndexStmt *stmt,
Oid indexRelationId,
bool is_alter_table,
bool check_rights,
extern char *ChooseRelationName(const char *name1, const char *name2,
const char *label, Oid namespaceid);
extern bool CheckIndexCompatible(Oid oldId,
- RangeVar *heapRelation,
char *accessMethodName,
List *attributeList,
List *exclusionOpNames);
extern void RangeVarCallbackOwnsTable(const RangeVar *relation,
Oid relId, Oid oldRelId, void *arg);
+extern void RangeVarCallbackOwnsRelation(const RangeVar *relation,
+ Oid relId, Oid oldRelId, void *noCatalogs);
#endif /* TABLECMDS_H */
#define TRIGGER_DISABLED 'D'
extern Oid CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
- Oid constraintOid, Oid indexOid,
+ Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
bool isInternal);
extern void RemoveTriggerById(Oid trigOid);
/* Fields used for constraints that allow a NOT VALID specification */
bool skip_validation; /* skip validation of existing rows? */
bool initially_valid; /* mark the new constraint as valid? */
+
+ Oid old_pktable_oid; /* pg_constraint.confrelid of my former self */
} Constraint;
/* ----------------------
extern List *transformCreateStmt(CreateStmt *stmt, const char *queryString);
-extern List *transformAlterTableStmt(AlterTableStmt *stmt,
+extern List *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
const char *queryString);
-extern IndexStmt *transformIndexStmt(IndexStmt *stmt, const char *queryString);
+extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
+ const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
extern List *transformCreateSchemaStmt(CreateSchemaStmt *stmt);
extern bool CommandIsReadOnly(Node *parsetree);
-extern void CheckRelationOwnership(RangeVar *rel, bool noCatalogs);
-
#endif /* UTILITY_H */
projects / postgresql / commitdiff