#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"
Boot_DeclareIndexStmt:
XDECLARE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
+ Oid relationId;
+
do_start();
- DefineIndex(makeRangeVar(NULL, $6, -1),
+ relationId = RangeVarGetRelid(makeRangeVar(NULL, $6, -1),
+ false);
+
+ DefineIndex(relationId,
$3,
$4,
$8,
Boot_DeclareUniqueIndexStmt:
XDECLARE UNIQUE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
+ Oid relationId;
+
do_start();
- DefineIndex(makeRangeVar(NULL, $7, -1),
+ relationId = RangeVarGetRelid(makeRangeVar(NULL, $7, -1),
+ false);
+
+ DefineIndex(relationId,
$4,
$5,
$9,
IndexInfo *indexInfo,
Snapshot snapshot,
v_i_state *state);
-static Oid IndexGetRelation(Oid indexId);
static bool ReindexIsCurrentlyProcessingIndex(Oid indexOid);
static void SetReindexProcessing(Oid heapOid, Oid indexOid);
static void ResetReindexProcessing(void);
*/
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);
}
/*
* IndexGetRelation: given an index's relation OID, get the OID of the
* relation it is an index on. Uses the system cache.
*/
-static Oid
+Oid
IndexGetRelation(Oid indexId)
{
HeapTuple tuple;
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_constraint_oid
* Find a constraint on the specified relation with the specified name.
{
Oid relid;
- CheckRelationOwnership(stmt->relation, true);
-
relid = RangeVarGetRelid(stmt->relation, false);
+ CheckRelationOwnership(relid, true);
switch (stmt->renameType)
{
case OBJECT_TABLE:
case OBJECT_VIEW:
case OBJECT_FOREIGN_TABLE:
- CheckRelationOwnership(stmt->relation, true);
AlterTableNamespace(stmt->relation, stmt->newschema,
stmt->objectType, AccessExclusiveLock);
break;
* DefineIndex
* Creates a new index.
*
- * 'heapRelation': the relation the index will apply to.
+ * 'relationId': the OID of the heap relation on which the index is to be
+ * created
* 'indexRelationName': the name for the new index, or NULL to indicate
* that a nonconflicting default name should be picked.
* 'indexRelationId': normally InvalidOid, but during bootstrap can be
* 'concurrent': avoid blocking writers to the table while building.
*/
void
-DefineIndex(RangeVar *heapRelation,
+DefineIndex(Oid relationId,
char *indexRelationName,
Oid indexRelationId,
char *accessMethodName,
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(heapRelation,
- (concurrent ? ShareUpdateExclusiveLock : ShareLock));
+ lockmode = concurrent ? ShareUpdateExclusiveLock : ShareLock;
+ rel = heap_open(relationId, lockmode);
relationId = RelationGetRelid(rel);
namespaceId = RelationGetNamespace(rel);
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot create index on foreign table \"%s\"",
- heapRelation->relname)));
+ RelationGetRelationName(rel))));
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is not a table",
- heapRelation->relname)));
+ RelationGetRelationName(rel))));
}
/*
*/
/* Open and lock the parent heap relation */
- rel = heap_openrv(heapRelation, ShareUpdateExclusiveLock);
+ rel = heap_open(relationId, ShareUpdateExclusiveLock);
/* And the target index relation */
indexRelation = index_open(indexRelationId, RowExclusiveLock);
#include "storage/lock.h"
#include "storage/predicate.h"
#include "storage/smgr.h"
+#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
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 ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
AlterTableCmd *cmd, LOCKMODE lockmode);
static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode);
-static void ATPostAlterTypeParse(char *cmd, List **wqueue, LOCKMODE lockmode);
+static void ATPostAlterTypeParse(Oid oldRelId, Oid refRelId, char *cmd,
+ List **wqueue, LOCKMODE lockmode);
static void change_owner_fix_column_acls(Oid relationOid,
Oid oldOwnerId, Oid newOwnerId);
static void change_owner_recurse_to_sequences(Oid relationOid,
* rather than reassess it at lower levels.
*/
void
-AlterTable(AlterTableStmt *stmt)
+AlterTable(Oid relid, AlterTableStmt *stmt)
{
Relation rel;
LOCKMODE lockmode = AlterTableGetLockLevel(stmt->cmds);
- /*
- * Acquire same level of lock as already acquired during parsing.
- */
- rel = relation_openrv(stmt->relation, lockmode);
+ /* Caller is required to provide an adequate lock. */
+ rel = relation_open(relid, NoLock);
CheckTableNotInUse(rel, "ALTER TABLE");
/* The IndexStmt has already been through transformIndexStmt */
- DefineIndex(stmt->relation, /* relation */
+ DefineIndex(RelationGetRelid(rel), /* relation */
stmt->idxname, /* index name */
InvalidOid, /* no predefined OID */
stmt->accessMethod, /* am name */
* 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 rows.
}
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";
- 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";
- 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";
- 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();
* and the use of self-referential FKs is rare enough, that we live with
* it for now. There will be a real fix in PG 9.2.
*/
- 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);
}
/*
ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode)
{
ObjectAddress obj;
- ListCell *l;
+ ListCell *def_item;
+ ListCell *oid_item;
/*
* Re-parse the index and constraint definitions, and attach them to the
* 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.
*/
- foreach(l, tab->changedIndexDefs)
- ATPostAlterTypeParse((char *) lfirst(l), wqueue, lockmode);
- foreach(l, tab->changedConstraintDefs)
- ATPostAlterTypeParse((char *) lfirst(l), wqueue, lockmode);
+ forboth(oid_item, tab->changedConstraintOids,
+ def_item, tab->changedConstraintDefs)
+ {
+ Oid oldId = lfirst_oid(oid_item);
+ Oid relid;
+ Oid confrelid;
+
+ get_constraint_relation_oids(oldId, &relid, &confrelid);
+ ATPostAlterTypeParse(relid, confrelid,
+ (char *) lfirst(def_item),
+ wqueue, lockmode);
+ }
+ forboth(oid_item, tab->changedIndexOids,
+ def_item, tab->changedIndexDefs)
+ {
+ Oid oldId = lfirst_oid(oid_item);
+ Oid relid;
+
+ relid = IndexGetRelation(oldId);
+ ATPostAlterTypeParse(relid, InvalidOid,
+ (char *) lfirst(def_item),
+ wqueue, lockmode);
+ }
/*
* Now we can drop the existing constraints and indexes --- constraints
* should be okay to use DROP_RESTRICT here, since nothing else should be
* depending on these objects.
*/
- foreach(l, tab->changedConstraintOids)
+ foreach(oid_item, tab->changedConstraintOids)
{
obj.classId = ConstraintRelationId;
- obj.objectId = lfirst_oid(l);
+ obj.objectId = lfirst_oid(oid_item);
obj.objectSubId = 0;
performDeletion(&obj, DROP_RESTRICT);
}
- foreach(l, tab->changedIndexOids)
+ foreach(oid_item, tab->changedIndexOids)
{
obj.classId = RelationRelationId;
- obj.objectId = lfirst_oid(l);
+ obj.objectId = lfirst_oid(oid_item);
obj.objectSubId = 0;
performDeletion(&obj, DROP_RESTRICT);
}
}
static void
-ATPostAlterTypeParse(char *cmd, List **wqueue, LOCKMODE lockmode)
+ATPostAlterTypeParse(Oid oldRelId, Oid refRelId, char *cmd, List **wqueue,
+ LOCKMODE lockmode)
{
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))
IndexStmt *stmt = (IndexStmt *) stm;
AlterTableCmd *newcmd;
- 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)
{
(int) cmd->subtype);
}
}
- relation_close(rel, NoLock);
break;
}
default:
(int) nodeTag(stm));
}
}
-}
+ relation_close(rel, NoLock);
+}
/*
* ALTER TABLE OWNER
/*
* Execute ALTER TABLE SET SCHEMA
*
- * Note: caller must have checked ownership of the relation already
+ * WARNING WARNING WARNING: In previous *minor* releases the caller was
+ * responsible for checking ownership of the relation, but now we do it here.
*/
void
AlterTableNamespace(RangeVar *relation, const char *newschema,
rel = relation_openrv(relation, lockmode);
relid = RelationGetRelid(rel);
+ CheckRelationOwnership(relid, true);
oldNspOid = RelationGetNamespace(rel);
/* Check relation type against type specified in the ALTER command */
* 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)
- constrrelid = RangeVarGetRelid(stmt->constrrel, false);
+ if (stmt->isconstraint)
+ {
+ if (OidIsValid(refRelOid))
+ constrrelid = refRelOid;
+ else if (stmt->constrrel != NULL)
+ constrrelid = RangeVarGetRelid(stmt->constrrel, false);
+ }
/* permission checks */
if (!isInternal)
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_del_action);
COPY_SCALAR_FIELD(skip_validation);
COPY_SCALAR_FIELD(initially_valid);
+ COPY_SCALAR_FIELD(old_pktable_oid);
return newnode;
}
COMPARE_SCALAR_FIELD(fk_del_action);
COMPARE_SCALAR_FIELD(skip_validation);
COMPARE_SCALAR_FIELD(initially_valid);
+ COMPARE_SCALAR_FIELD(old_pktable_oid);
return true;
}
WRITE_CHAR_FIELD(fk_del_action);
WRITE_BOOL_FIELD(skip_validation);
WRITE_BOOL_FIELD(initially_valid);
+ WRITE_OID_FIELD(old_pktable_oid);
break;
case CONSTR_ATTR_DEFERRABLE:
* 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(stmt->relation, lockmode);
+ /* 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);
/*
#include "rewrite/rewriteDefine.h"
#include "rewrite/rewriteRemove.h"
#include "storage/fd.h"
+#include "storage/lmgr.h"
#include "tcop/pquery.h"
#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/guc.h"
#include "utils/syscache.h"
+#include "utils/lsyscache.h"
/* Hook for plugins to get control in ProcessUtility() */
* except when allowSystemTableMods is true.
*/
void
-CheckRelationOwnership(RangeVar *rel, bool noCatalogs)
+CheckRelationOwnership(Oid relOid, bool noCatalogs)
{
- Oid relOid;
HeapTuple tuple;
- relOid = RangeVarGetRelid(rel, 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);
+ get_rel_name(relOid));
if (noCatalogs)
{
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied: \"%s\" is a system catalog",
- rel->relname)));
+ get_rel_name(relOid))));
}
ReleaseSysCache(tuple);
{
List *stmts;
ListCell *l;
+ AlterTableStmt *atstmt = (AlterTableStmt *) parsetree;
+ Oid relid;
+ LOCKMODE lockmode;
+
+ /*
+ * 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.
+ */
+ lockmode = AlterTableGetLockLevel(atstmt->cmds);
+ relid = RangeVarGetRelid(atstmt->relation, false);
+ LockRelationOid(relid, lockmode);
/* Run parse analysis ... */
- stmts = transformAlterTableStmt((AlterTableStmt *) parsetree,
+ stmts = transformAlterTableStmt(relid,
+ atstmt,
queryString);
/* ... and do it */
if (IsA(stmt, AlterTableStmt))
{
/* Do the table alteration proper */
- AlterTable((AlterTableStmt *) stmt);
+ AlterTable(relid, (AlterTableStmt *) stmt);
}
else
{
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 = RangeVarGetRelid(stmt->relation, false);
+ LockRelationOid(relid, lockmode);
+ CheckRelationOwnership(relid, true);
/* Run parse analysis ... */
- stmt = transformIndexStmt(stmt, queryString);
+ stmt = transformIndexStmt(relid, stmt, queryString);
/* ... and do it */
- DefineIndex(stmt->relation, /* relation */
+ DefineIndex(relid, /* relation */
stmt->idxname, /* index name */
InvalidOid, /* no predefined OID */
stmt->accessMethod, /* am name */
case T_CreateTrigStmt:
(void) CreateTrigger((CreateTrigStmt *) parsetree, queryString,
- InvalidOid, InvalidOid, false);
+ InvalidOid, InvalidOid, InvalidOid,
+ InvalidOid, false);
break;
case T_DropPropertyStmt:
extern bool ReindexIsProcessingHeap(Oid heapOid);
extern bool ReindexIsProcessingIndex(Oid indexOid);
+extern Oid IndexGetRelation(Oid indexId);
#endif /* INDEX_H */
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_constraint_oid(Oid relid, const char *conname, bool missing_ok);
extern bool check_functional_grouping(Oid relid,
/* commands/indexcmds.c */
-extern void DefineIndex(RangeVar *heapRelation,
+extern void DefineIndex(Oid relationId,
char *indexRelationName,
Oid indexRelationId,
char *accessMethodName,
extern void RemoveRelations(DropStmt *drop);
-extern void AlterTable(AlterTableStmt *stmt);
+extern void AlterTable(Oid relid, AlterTableStmt *stmt);
extern LOCKMODE AlterTableGetLockLevel(List *cmds);
#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 DropTrigger(Oid relid, const char *trigname,
char fk_del_action; /* ON DELETE action */
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);
+extern void CheckRelationOwnership(Oid relOid, bool noCatalogs);
#endif /* UTILITY_H */
projects / postgresql / commitdiff