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/*-------------------------------------------------------------------------
*
* sequence.c
* PostgreSQL sequences support code.
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/commands/sequence.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/bufmask.h"
#include "access/htup_details.h"
#include "access/multixact.h"
#include "access/transam.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "access/xloginsert.h"
#include "access/xlogutils.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_sequence.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
#include "storage/lmgr.h"
#include "storage/proc.h"
#include "storage/smgr.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/resowner.h"
#include "utils/syscache.h"
#include "utils/varlena.h"
/*
* We don't want to log each fetching of a value from a sequence,
* so we pre-log a few fetches in advance. In the event of
* crash we can lose (skip over) as many values as we pre-logged.
*/
#define SEQ_LOG_VALS 32
/*
* The "special area" of a sequence's buffer page looks like this.
*/
#define SEQ_MAGIC 0x1717
typedef struct sequence_magic
{
uint32 magic;
} sequence_magic;
/*
* We store a SeqTable item for every sequence we have touched in the current
* session. This is needed to hold onto nextval/currval state. (We can't
* rely on the relcache, since it's only, well, a cache, and may decide to
* discard entries.)
*/
typedef struct SeqTableData
{
Oid relid; /* pg_class OID of this sequence (hash key) */
Oid filenode; /* last seen relfilenode of this sequence */
LocalTransactionId lxid; /* xact in which we last did a seq op */
bool last_valid; /* do we have a valid "last" value? */
int64 last; /* value last returned by nextval */
int64 cached; /* last value already cached for nextval */
/* if last != cached, we have not used up all the cached values */
int64 increment; /* copy of sequence's increment field */
/* note that increment is zero until we first do nextval_internal() */
} SeqTableData;
typedef SeqTableData *SeqTable;
static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
/*
* last_used_seq is updated by nextval() to point to the last used
* sequence.
*/
static SeqTableData *last_used_seq = NULL;
static void fill_seq_with_data(Relation rel, HeapTuple tuple);
static Relation lock_and_open_sequence(SeqTable seq);
static void create_seq_hashtable(void);
static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
static Form_pg_sequence_data read_seq_tuple(Relation rel,
Buffer *buf, HeapTuple seqdatatuple);
static void init_params(ParseState *pstate, List *options, bool for_identity,
bool isInit,
Form_pg_sequence seqform,
Form_pg_sequence_data seqdataform,
bool *need_seq_rewrite,
List **owned_by);
static void do_setval(Oid relid, int64 next, bool iscalled);
static void process_owned_by(Relation seqrel, List *owned_by, bool for_identity);
/*
* DefineSequence
* Creates a new sequence relation
*/
ObjectAddress
DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
{
FormData_pg_sequence seqform;
FormData_pg_sequence_data seqdataform;
bool need_seq_rewrite;
List *owned_by;
CreateStmt *stmt = makeNode(CreateStmt);
Oid seqoid;
ObjectAddress address;
Relation rel;
HeapTuple tuple;
TupleDesc tupDesc;
Datum value[SEQ_COL_LASTCOL];
bool null[SEQ_COL_LASTCOL];
Datum pgs_values[Natts_pg_sequence];
bool pgs_nulls[Natts_pg_sequence];
int i;
/* Unlogged sequences are not implemented -- not clear if useful. */
if (seq->sequence->relpersistence == RELPERSISTENCE_UNLOGGED)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("unlogged sequences are not supported")));
/*
* If if_not_exists was given and a relation with the same name already
* exists, bail out. (Note: we needn't check this when not if_not_exists,
* because DefineRelation will complain anyway.)
*/
if (seq->if_not_exists)
{
RangeVarGetAndCheckCreationNamespace(seq->sequence, NoLock, &seqoid);
if (OidIsValid(seqoid))
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists, skipping",
seq->sequence->relname)));
return InvalidObjectAddress;
}
}
/* Check and set all option values */
init_params(pstate, seq->options, seq->for_identity, true,
&seqform, &seqdataform,
&need_seq_rewrite, &owned_by);
/*
* Create relation (and fill value[] and null[] for the tuple)
*/
stmt->tableElts = NIL;
for (i = SEQ_COL_FIRSTCOL; i <= SEQ_COL_LASTCOL; i++)
{
ColumnDef *coldef = makeNode(ColumnDef);
coldef->inhcount = 0;
coldef->is_local = true;
coldef->is_not_null = true;
coldef->is_from_type = false;
coldef->storage = 0;
coldef->raw_default = NULL;
coldef->cooked_default = NULL;
coldef->collClause = NULL;
coldef->collOid = InvalidOid;
coldef->constraints = NIL;
coldef->location = -1;
null[i - 1] = false;
switch (i)
{
case SEQ_COL_LASTVAL:
coldef->typeName = makeTypeNameFromOid(INT8OID, -1);
coldef->colname = "last_value";
value[i - 1] = Int64GetDatumFast(seqdataform.last_value);
break;
case SEQ_COL_LOG:
coldef->typeName = makeTypeNameFromOid(INT8OID, -1);
coldef->colname = "log_cnt";
value[i - 1] = Int64GetDatum((int64) 0);
break;
case SEQ_COL_CALLED:
coldef->typeName = makeTypeNameFromOid(BOOLOID, -1);
coldef->colname = "is_called";
value[i - 1] = BoolGetDatum(false);
break;
}
stmt->tableElts = lappend(stmt->tableElts, coldef);
}
stmt->relation = seq->sequence;
stmt->inhRelations = NIL;
stmt->constraints = NIL;
stmt->options = NIL;
stmt->oncommit = ONCOMMIT_NOOP;
stmt->tablespacename = NULL;
stmt->if_not_exists = seq->if_not_exists;
address = DefineRelation(stmt, RELKIND_SEQUENCE, seq->ownerId, NULL, NULL);
seqoid = address.objectId;
Assert(seqoid != InvalidOid);
rel = heap_open(seqoid, AccessExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* now initialize the sequence's data */
tuple = heap_form_tuple(tupDesc, value, null);
fill_seq_with_data(rel, tuple);
/* process OWNED BY if given */
if (owned_by)
process_owned_by(rel, owned_by, seq->for_identity);
heap_close(rel, NoLock);
/* fill in pg_sequence */
rel = heap_open(SequenceRelationId, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
memset(pgs_nulls, 0, sizeof(pgs_nulls));
pgs_values[Anum_pg_sequence_seqrelid - 1] = ObjectIdGetDatum(seqoid);
pgs_values[Anum_pg_sequence_seqtypid - 1] = ObjectIdGetDatum(seqform.seqtypid);
pgs_values[Anum_pg_sequence_seqstart - 1] = Int64GetDatumFast(seqform.seqstart);
pgs_values[Anum_pg_sequence_seqincrement - 1] = Int64GetDatumFast(seqform.seqincrement);
pgs_values[Anum_pg_sequence_seqmax - 1] = Int64GetDatumFast(seqform.seqmax);
pgs_values[Anum_pg_sequence_seqmin - 1] = Int64GetDatumFast(seqform.seqmin);
pgs_values[Anum_pg_sequence_seqcache - 1] = Int64GetDatumFast(seqform.seqcache);
pgs_values[Anum_pg_sequence_seqcycle - 1] = BoolGetDatum(seqform.seqcycle);
tuple = heap_form_tuple(tupDesc, pgs_values, pgs_nulls);
CatalogTupleInsert(rel, tuple);
heap_freetuple(tuple);
heap_close(rel, RowExclusiveLock);
return address;
}
/*
* Reset a sequence to its initial value.
*
* The change is made transactionally, so that on failure of the current
* transaction, the sequence will be restored to its previous state.
* We do that by creating a whole new relfilenode for the sequence; so this
* works much like the rewriting forms of ALTER TABLE.
*
* Caller is assumed to have acquired AccessExclusiveLock on the sequence,
* which must not be released until end of transaction. Caller is also
* responsible for permissions checking.
*/
void
ResetSequence(Oid seq_relid)
{
Relation seq_rel;
SeqTable elm;
Form_pg_sequence_data seq;
Buffer buf;
HeapTupleData seqdatatuple;
HeapTuple tuple;
HeapTuple pgstuple;
Form_pg_sequence pgsform;
int64 startv;
/*
* Read the old sequence. This does a bit more work than really
* necessary, but it's simple, and we do want to double-check that it's
* indeed a sequence.
*/
init_sequence(seq_relid, &elm, &seq_rel);
(void) read_seq_tuple(seq_rel, &buf, &seqdatatuple);
pgstuple = SearchSysCache1(SEQRELID, ObjectIdGetDatum(seq_relid));
if (!HeapTupleIsValid(pgstuple))
elog(ERROR, "cache lookup failed for sequence %u", seq_relid);
pgsform = (Form_pg_sequence) GETSTRUCT(pgstuple);
startv = pgsform->seqstart;
ReleaseSysCache(pgstuple);
/*
* Copy the existing sequence tuple.
*/
tuple = heap_copytuple(&seqdatatuple);
/* Now we're done with the old page */
UnlockReleaseBuffer(buf);
/*
* Modify the copied tuple to execute the restart (compare the RESTART
* action in AlterSequence)
*/
seq = (Form_pg_sequence_data) GETSTRUCT(tuple);
seq->last_value = startv;
seq->is_called = false;
seq->log_cnt = 0;
/*
* Create a new storage file for the sequence. We want to keep the
* sequence's relfrozenxid at 0, since it won't contain any unfrozen XIDs.
* Same with relminmxid, since a sequence will never contain multixacts.
*/
RelationSetNewRelfilenode(seq_rel, seq_rel->rd_rel->relpersistence,
InvalidTransactionId, InvalidMultiXactId);
/*
* Insert the modified tuple into the new storage file.
*/
fill_seq_with_data(seq_rel, tuple);
/* Clear local cache so that we don't think we have cached numbers */
/* Note that we do not change the currval() state */
elm->cached = elm->last;
relation_close(seq_rel, NoLock);
}
/*
* Initialize a sequence's relation with the specified tuple as content
*/
static void
fill_seq_with_data(Relation rel, HeapTuple tuple)
{
Buffer buf;
Page page;
sequence_magic *sm;
OffsetNumber offnum;
/* Initialize first page of relation with special magic number */
buf = ReadBuffer(rel, P_NEW);
Assert(BufferGetBlockNumber(buf) == 0);
page = BufferGetPage(buf);
PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
sm = (sequence_magic *) PageGetSpecialPointer(page);
sm->magic = SEQ_MAGIC;
/* Now insert sequence tuple */
LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
/*
* Since VACUUM does not process sequences, we have to force the tuple to
* have xmin = FrozenTransactionId now. Otherwise it would become
* invisible to SELECTs after 2G transactions. It is okay to do this
* because if the current transaction aborts, no other xact will ever
* examine the sequence tuple anyway.
*/
HeapTupleHeaderSetXmin(tuple->t_data, FrozenTransactionId);
HeapTupleHeaderSetXminFrozen(tuple->t_data);
HeapTupleHeaderSetCmin(tuple->t_data, FirstCommandId);
HeapTupleHeaderSetXmax(tuple->t_data, InvalidTransactionId);
tuple->t_data->t_infomask |= HEAP_XMAX_INVALID;
ItemPointerSet(&tuple->t_data->t_ctid, 0, FirstOffsetNumber);
/* check the comment above nextval_internal()'s equivalent call. */
if (RelationNeedsWAL(rel))
GetTopTransactionId();
START_CRIT_SECTION();
MarkBufferDirty(buf);
offnum = PageAddItem(page, (Item) tuple->t_data, tuple->t_len,
InvalidOffsetNumber, false, false);
if (offnum != FirstOffsetNumber)
elog(ERROR, "failed to add sequence tuple to page");
/* XLOG stuff */
if (RelationNeedsWAL(rel))
{
xl_seq_rec xlrec;
XLogRecPtr recptr;
XLogBeginInsert();
XLogRegisterBuffer(0, buf, REGBUF_WILL_INIT);
xlrec.node = rel->rd_node;
XLogRegisterData((char *) &xlrec, sizeof(xl_seq_rec));
XLogRegisterData((char *) tuple->t_data, tuple->t_len);
recptr = XLogInsert(RM_SEQ_ID, XLOG_SEQ_LOG);
PageSetLSN(page, recptr);
}
END_CRIT_SECTION();
UnlockReleaseBuffer(buf);
}
/*
* AlterSequence
*
* Modify the definition of a sequence relation
*/
ObjectAddress
AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
{
Oid relid;
SeqTable elm;
Relation seqrel;
Buffer buf;
HeapTupleData datatuple;
Form_pg_sequence seqform;
Form_pg_sequence_data newdataform;
bool need_seq_rewrite;
List *owned_by;
ObjectAddress address;
Relation rel;
HeapTuple seqtuple;
HeapTuple newdatatuple;
/* Open and lock sequence, and check for ownership along the way. */
relid = RangeVarGetRelidExtended(stmt->sequence,
ShareRowExclusiveLock,
stmt->missing_ok ? RVR_MISSING_OK : 0,
RangeVarCallbackOwnsRelation,
NULL);
if (relid == InvalidOid)
{
ereport(NOTICE,
(errmsg("relation \"%s\" does not exist, skipping",
stmt->sequence->relname)));
return InvalidObjectAddress;
}
init_sequence(relid, &elm, &seqrel);
rel = heap_open(SequenceRelationId, RowExclusiveLock);
seqtuple = SearchSysCacheCopy1(SEQRELID,
ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(seqtuple))
elog(ERROR, "cache lookup failed for sequence %u",
relid);
seqform = (Form_pg_sequence) GETSTRUCT(seqtuple);
/* lock page's buffer and read tuple into new sequence structure */
(void) read_seq_tuple(seqrel, &buf, &datatuple);
/* copy the existing sequence data tuple, so it can be modified locally */
newdatatuple = heap_copytuple(&datatuple);
newdataform = (Form_pg_sequence_data) GETSTRUCT(newdatatuple);
UnlockReleaseBuffer(buf);
/* Check and set new values */
init_params(pstate, stmt->options, stmt->for_identity, false,
seqform, newdataform,
&need_seq_rewrite, &owned_by);
/* Clear local cache so that we don't think we have cached numbers */
/* Note that we do not change the currval() state */
elm->cached = elm->last;
/* If needed, rewrite the sequence relation itself */
if (need_seq_rewrite)
{
/* check the comment above nextval_internal()'s equivalent call. */
if (RelationNeedsWAL(seqrel))
GetTopTransactionId();
/*
* Create a new storage file for the sequence, making the state
* changes transactional. We want to keep the sequence's relfrozenxid
* at 0, since it won't contain any unfrozen XIDs. Same with
* relminmxid, since a sequence will never contain multixacts.
*/
RelationSetNewRelfilenode(seqrel, seqrel->rd_rel->relpersistence,
InvalidTransactionId, InvalidMultiXactId);
/*
* Insert the modified tuple into the new storage file.
*/
fill_seq_with_data(seqrel, newdatatuple);
}
/* process OWNED BY if given */
if (owned_by)
process_owned_by(seqrel, owned_by, stmt->for_identity);
/* update the pg_sequence tuple (we could skip this in some cases...) */
CatalogTupleUpdate(rel, &seqtuple->t_self, seqtuple);
InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
ObjectAddressSet(address, RelationRelationId, relid);
heap_close(rel, RowExclusiveLock);
relation_close(seqrel, NoLock);
return address;
}
void
DeleteSequenceTuple(Oid relid)
{
Relation rel;
HeapTuple tuple;
rel = heap_open(SequenceRelationId, RowExclusiveLock);
tuple = SearchSysCache1(SEQRELID, ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for sequence %u", relid);
CatalogTupleDelete(rel, &tuple->t_self);
ReleaseSysCache(tuple);
heap_close(rel, RowExclusiveLock);
}
/*
* Note: nextval with a text argument is no longer exported as a pg_proc
* entry, but we keep it around to ease porting of C code that may have
* called the function directly.
*/
Datum
nextval(PG_FUNCTION_ARGS)
{
text *seqin = PG_GETARG_TEXT_PP(0);
RangeVar *sequence;
Oid relid;
sequence = makeRangeVarFromNameList(textToQualifiedNameList(seqin));
/*
* XXX: This is not safe in the presence of concurrent DDL, but acquiring
* a lock here is more expensive than letting nextval_internal do it,
* since the latter maintains a cache that keeps us from hitting the lock
* manager more than once per transaction. It's not clear whether the
* performance penalty is material in practice, but for now, we do it this
* way.
*/
relid = RangeVarGetRelid(sequence, NoLock, false);
PG_RETURN_INT64(nextval_internal(relid, true));
}
Datum
nextval_oid(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
PG_RETURN_INT64(nextval_internal(relid, true));
}
int64
nextval_internal(Oid relid, bool check_permissions)
{
SeqTable elm;
Relation seqrel;
Buffer buf;
Page page;
HeapTuple pgstuple;
Form_pg_sequence pgsform;
HeapTupleData seqdatatuple;
Form_pg_sequence_data seq;
int64 incby,
maxv,
minv,
cache,
log,
fetch,
last;
int64 result,
next,
rescnt = 0;
bool cycle;
bool logit = false;
/* open and lock sequence */
init_sequence(relid, &elm, &seqrel);
if (check_permissions &&
pg_class_aclcheck(elm->relid, GetUserId(),
ACL_USAGE | ACL_UPDATE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
/* read-only transactions may only modify temp sequences */
if (!seqrel->rd_islocaltemp)
PreventCommandIfReadOnly("nextval()");
/*
* Forbid this during parallel operation because, to make it work, the
* cooperating backends would need to share the backend-local cached
* sequence information. Currently, we don't support that.
*/
PreventCommandIfParallelMode("nextval()");
if (elm->last != elm->cached) /* some numbers were cached */
{
Assert(elm->last_valid);
Assert(elm->increment != 0);
elm->last += elm->increment;
relation_close(seqrel, NoLock);
last_used_seq = elm;
return elm->last;
}
pgstuple = SearchSysCache1(SEQRELID, ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(pgstuple))
elog(ERROR, "cache lookup failed for sequence %u", relid);
pgsform = (Form_pg_sequence) GETSTRUCT(pgstuple);
incby = pgsform->seqincrement;
maxv = pgsform->seqmax;
minv = pgsform->seqmin;
cache = pgsform->seqcache;
cycle = pgsform->seqcycle;
ReleaseSysCache(pgstuple);
/* lock page' buffer and read tuple */
seq = read_seq_tuple(seqrel, &buf, &seqdatatuple);
page = BufferGetPage(buf);
elm->increment = incby;
last = next = result = seq->last_value;
fetch = cache;
log = seq->log_cnt;
if (!seq->is_called)
{
rescnt++; /* return last_value if not is_called */
fetch--;
}
/*
* Decide whether we should emit a WAL log record. If so, force up the
* fetch count to grab SEQ_LOG_VALS more values than we actually need to
* cache. (These will then be usable without logging.)
*
* If this is the first nextval after a checkpoint, we must force a new
* WAL record to be written anyway, else replay starting from the
* checkpoint would fail to advance the sequence past the logged values.
* In this case we may as well fetch extra values.
*/
if (log < fetch || !seq->is_called)
{
/* forced log to satisfy local demand for values */
fetch = log = fetch + SEQ_LOG_VALS;
logit = true;
}
else
{
XLogRecPtr redoptr = GetRedoRecPtr();
if (PageGetLSN(page) <= redoptr)
{
/* last update of seq was before checkpoint */
fetch = log = fetch + SEQ_LOG_VALS;
logit = true;
}
}
while (fetch) /* try to fetch cache [+ log ] numbers */
{
/*
* Check MAXVALUE for ascending sequences and MINVALUE for descending
* sequences
*/
if (incby > 0)
{
/* ascending sequence */
if ((maxv >= 0 && next > maxv - incby) ||
(maxv < 0 && next + incby > maxv))
{
if (rescnt > 0)
break; /* stop fetching */
if (!cycle)
{
char buf[100];
snprintf(buf, sizeof(buf), INT64_FORMAT, maxv);
ereport(ERROR,
(errcode(ERRCODE_SEQUENCE_GENERATOR_LIMIT_EXCEEDED),
errmsg("nextval: reached maximum value of sequence \"%s\" (%s)",
RelationGetRelationName(seqrel), buf)));
}
next = minv;
}
else
next += incby;
}
else
{
/* descending sequence */
if ((minv < 0 && next < minv - incby) ||
(minv >= 0 && next + incby < minv))
{
if (rescnt > 0)
break; /* stop fetching */
if (!cycle)
{
char buf[100];
snprintf(buf, sizeof(buf), INT64_FORMAT, minv);
ereport(ERROR,
(errcode(ERRCODE_SEQUENCE_GENERATOR_LIMIT_EXCEEDED),
errmsg("nextval: reached minimum value of sequence \"%s\" (%s)",
RelationGetRelationName(seqrel), buf)));
}
next = maxv;
}
else
next += incby;
}
fetch--;
if (rescnt < cache)
{
log--;
rescnt++;
last = next;
if (rescnt == 1) /* if it's first result - */
result = next; /* it's what to return */
}
}
log -= fetch; /* adjust for any unfetched numbers */
Assert(log >= 0);
/* save info in local cache */
elm->last = result; /* last returned number */
elm->cached = last; /* last fetched number */
elm->last_valid = true;
last_used_seq = elm;
/*
* If something needs to be WAL logged, acquire an xid, so this
* transaction's commit will trigger a WAL flush and wait for syncrep.
* It's sufficient to ensure the toplevel transaction has an xid, no need
* to assign xids subxacts, that'll already trigger an appropriate wait.
* (Have to do that here, so we're outside the critical section)
*/
if (logit && RelationNeedsWAL(seqrel))
GetTopTransactionId();
/* ready to change the on-disk (or really, in-buffer) tuple */
START_CRIT_SECTION();
/*
* We must mark the buffer dirty before doing XLogInsert(); see notes in
* SyncOneBuffer(). However, we don't apply the desired changes just yet.
* This looks like a violation of the buffer update protocol, but it is in
* fact safe because we hold exclusive lock on the buffer. Any other
* process, including a checkpoint, that tries to examine the buffer
* contents will block until we release the lock, and then will see the
* final state that we install below.
*/
MarkBufferDirty(buf);
/* XLOG stuff */
if (logit && RelationNeedsWAL(seqrel))
{
xl_seq_rec xlrec;
XLogRecPtr recptr;
/*
* We don't log the current state of the tuple, but rather the state
* as it would appear after "log" more fetches. This lets us skip
* that many future WAL records, at the cost that we lose those
* sequence values if we crash.
*/
XLogBeginInsert();
XLogRegisterBuffer(0, buf, REGBUF_WILL_INIT);
/* set values that will be saved in xlog */
seq->last_value = next;
seq->is_called = true;
seq->log_cnt = 0;
xlrec.node = seqrel->rd_node;
XLogRegisterData((char *) &xlrec, sizeof(xl_seq_rec));
XLogRegisterData((char *) seqdatatuple.t_data, seqdatatuple.t_len);
recptr = XLogInsert(RM_SEQ_ID, XLOG_SEQ_LOG);
PageSetLSN(page, recptr);
}
/* Now update sequence tuple to the intended final state */
seq->last_value = last; /* last fetched number */
seq->is_called = true;
seq->log_cnt = log; /* how much is logged */
END_CRIT_SECTION();
UnlockReleaseBuffer(buf);
relation_close(seqrel, NoLock);
return result;
}
Datum
currval_oid(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
int64 result;
SeqTable elm;
Relation seqrel;
/* open and lock sequence */
init_sequence(relid, &elm, &seqrel);
if (pg_class_aclcheck(elm->relid, GetUserId(),
ACL_SELECT | ACL_USAGE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
if (!elm->last_valid)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("currval of sequence \"%s\" is not yet defined in this session",
RelationGetRelationName(seqrel))));
result = elm->last;
relation_close(seqrel, NoLock);
PG_RETURN_INT64(result);
}
Datum
lastval(PG_FUNCTION_ARGS)
{
Relation seqrel;
int64 result;
if (last_used_seq == NULL)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("lastval is not yet defined in this session")));
/* Someone may have dropped the sequence since the last nextval() */
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(last_used_seq->relid)))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("lastval is not yet defined in this session")));
seqrel = lock_and_open_sequence(last_used_seq);
/* nextval() must have already been called for this sequence */
Assert(last_used_seq->last_valid);
if (pg_class_aclcheck(last_used_seq->relid, GetUserId(),
ACL_SELECT | ACL_USAGE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
result = last_used_seq->last;
relation_close(seqrel, NoLock);
PG_RETURN_INT64(result);
}
/*
* Main internal procedure that handles 2 & 3 arg forms of SETVAL.
*
* Note that the 3 arg version (which sets the is_called flag) is
* only for use in pg_dump, and setting the is_called flag may not
* work if multiple users are attached to the database and referencing
* the sequence (unlikely if pg_dump is restoring it).
*
* It is necessary to have the 3 arg version so that pg_dump can
* restore the state of a sequence exactly during data-only restores -
* it is the only way to clear the is_called flag in an existing
* sequence.
*/
static void
do_setval(Oid relid, int64 next, bool iscalled)
{
SeqTable elm;
Relation seqrel;
Buffer buf;
HeapTupleData seqdatatuple;
Form_pg_sequence_data seq;
HeapTuple pgstuple;
Form_pg_sequence pgsform;
int64 maxv,
minv;
/* open and lock sequence */
init_sequence(relid, &elm, &seqrel);
if (pg_class_aclcheck(elm->relid, GetUserId(), ACL_UPDATE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
pgstuple = SearchSysCache1(SEQRELID, ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(pgstuple))
elog(ERROR, "cache lookup failed for sequence %u", relid);
pgsform = (Form_pg_sequence) GETSTRUCT(pgstuple);
maxv = pgsform->seqmax;
minv = pgsform->seqmin;
ReleaseSysCache(pgstuple);
/* read-only transactions may only modify temp sequences */
if (!seqrel->rd_islocaltemp)
PreventCommandIfReadOnly("setval()");
/*
* Forbid this during parallel operation because, to make it work, the
* cooperating backends would need to share the backend-local cached
* sequence information. Currently, we don't support that.
*/
PreventCommandIfParallelMode("setval()");
/* lock page' buffer and read tuple */
seq = read_seq_tuple(seqrel, &buf, &seqdatatuple);
if ((next < minv) || (next > maxv))
{
char bufv[100],
bufm[100],
bufx[100];
snprintf(bufv, sizeof(bufv), INT64_FORMAT, next);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, minv);
snprintf(bufx, sizeof(bufx), INT64_FORMAT, maxv);
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("setval: value %s is out of bounds for sequence \"%s\" (%s..%s)",
bufv, RelationGetRelationName(seqrel),
bufm, bufx)));
}
/* Set the currval() state only if iscalled = true */
if (iscalled)
{
elm->last = next; /* last returned number */
elm->last_valid = true;
}
/* In any case, forget any future cached numbers */
elm->cached = elm->last;
/* check the comment above nextval_internal()'s equivalent call. */
if (RelationNeedsWAL(seqrel))
GetTopTransactionId();
/* ready to change the on-disk (or really, in-buffer) tuple */
START_CRIT_SECTION();
seq->last_value = next; /* last fetched number */
seq->is_called = iscalled;
seq->log_cnt = 0;
MarkBufferDirty(buf);
/* XLOG stuff */
if (RelationNeedsWAL(seqrel))
{
xl_seq_rec xlrec;
XLogRecPtr recptr;
Page page = BufferGetPage(buf);
XLogBeginInsert();
XLogRegisterBuffer(0, buf, REGBUF_WILL_INIT);
xlrec.node = seqrel->rd_node;
XLogRegisterData((char *) &xlrec, sizeof(xl_seq_rec));
XLogRegisterData((char *) seqdatatuple.t_data, seqdatatuple.t_len);
recptr = XLogInsert(RM_SEQ_ID, XLOG_SEQ_LOG);
PageSetLSN(page, recptr);
}
END_CRIT_SECTION();
UnlockReleaseBuffer(buf);
relation_close(seqrel, NoLock);
}
/*
* Implement the 2 arg setval procedure.
* See do_setval for discussion.
*/
Datum
setval_oid(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
int64 next = PG_GETARG_INT64(1);
do_setval(relid, next, true);
PG_RETURN_INT64(next);
}
/*
* Implement the 3 arg setval procedure.
* See do_setval for discussion.
*/
Datum
setval3_oid(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
int64 next = PG_GETARG_INT64(1);
bool iscalled = PG_GETARG_BOOL(2);
do_setval(relid, next, iscalled);
PG_RETURN_INT64(next);
}
/*
* Open the sequence and acquire lock if needed
*
* If we haven't touched the sequence already in this transaction,
* we need to acquire a lock. We arrange for the lock to
* be owned by the top transaction, so that we don't need to do it
* more than once per xact.
*/
static Relation
lock_and_open_sequence(SeqTable seq)
{
LocalTransactionId thislxid = MyProc->lxid;
/* Get the lock if not already held in this xact */
if (seq->lxid != thislxid)
{
ResourceOwner currentOwner;
currentOwner = CurrentResourceOwner;
CurrentResourceOwner = TopTransactionResourceOwner;
LockRelationOid(seq->relid, RowExclusiveLock);
CurrentResourceOwner = currentOwner;
/* Flag that we have a lock in the current xact */
seq->lxid = thislxid;
}
/* We now know we have the lock, and can safely open the rel */
return relation_open(seq->relid, NoLock);
}
/*
* Creates the hash table for storing sequence data
*/
static void
create_seq_hashtable(void)
{
HASHCTL ctl;
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(Oid);
ctl.entrysize = sizeof(SeqTableData);
seqhashtab = hash_create("Sequence values", 16, &ctl,
HASH_ELEM | HASH_BLOBS);
}
/*
* Given a relation OID, open and lock the sequence. p_elm and p_rel are
* output parameters.
*/
static void
init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel)
{
SeqTable elm;
Relation seqrel;
bool found;
/* Find or create a hash table entry for this sequence */
if (seqhashtab == NULL)
create_seq_hashtable();
elm = (SeqTable) hash_search(seqhashtab, &relid, HASH_ENTER, &found);
/*
* Initialize the new hash table entry if it did not exist already.
*
* NOTE: seqtable entries are stored for the life of a backend (unless
* explicitly discarded with DISCARD). If the sequence itself is deleted
* then the entry becomes wasted memory, but it's small enough that this
* should not matter.
*/
if (!found)
{
/* relid already filled in */
elm->filenode = InvalidOid;
elm->lxid = InvalidLocalTransactionId;
elm->last_valid = false;
elm->last = elm->cached = 0;
}
/*
* Open the sequence relation.
*/
seqrel = lock_and_open_sequence(elm);
if (seqrel->rd_rel->relkind != RELKIND_SEQUENCE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is not a sequence",
RelationGetRelationName(seqrel))));
/*
* If the sequence has been transactionally replaced since we last saw it,
* discard any cached-but-unissued values. We do not touch the currval()
* state, however.
*/
if (seqrel->rd_rel->relfilenode != elm->filenode)
{
elm->filenode = seqrel->rd_rel->relfilenode;
elm->cached = elm->last;
}
/* Return results */
*p_elm = elm;
*p_rel = seqrel;
}
/*
* Given an opened sequence relation, lock the page buffer and find the tuple
*
* *buf receives the reference to the pinned-and-ex-locked buffer
* *seqdatatuple receives the reference to the sequence tuple proper
* (this arg should point to a local variable of type HeapTupleData)
*
* Function's return value points to the data payload of the tuple
*/
static Form_pg_sequence_data
read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
{
Page page;
ItemId lp;
sequence_magic *sm;
Form_pg_sequence_data seq;
*buf = ReadBuffer(rel, 0);
LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
page = BufferGetPage(*buf);
sm = (sequence_magic *) PageGetSpecialPointer(page);
if (sm->magic != SEQ_MAGIC)
elog(ERROR, "bad magic number in sequence \"%s\": %08X",
RelationGetRelationName(rel), sm->magic);
lp = PageGetItemId(page, FirstOffsetNumber);
Assert(ItemIdIsNormal(lp));
/* Note we currently only bother to set these two fields of *seqdatatuple */
seqdatatuple->t_data = (HeapTupleHeader) PageGetItem(page, lp);
seqdatatuple->t_len = ItemIdGetLength(lp);
/*
* Previous releases of Postgres neglected to prevent SELECT FOR UPDATE on
* a sequence, which would leave a non-frozen XID in the sequence tuple's
* xmax, which eventually leads to clog access failures or worse. If we
* see this has happened, clean up after it. We treat this like a hint
* bit update, ie, don't bother to WAL-log it, since we can certainly do
* this again if the update gets lost.
*/
Assert(!(seqdatatuple->t_data->t_infomask & HEAP_XMAX_IS_MULTI));
if (HeapTupleHeaderGetRawXmax(seqdatatuple->t_data) != InvalidTransactionId)
{
HeapTupleHeaderSetXmax(seqdatatuple->t_data, InvalidTransactionId);
seqdatatuple->t_data->t_infomask &= ~HEAP_XMAX_COMMITTED;
seqdatatuple->t_data->t_infomask |= HEAP_XMAX_INVALID;
MarkBufferDirtyHint(*buf, true);
}
seq = (Form_pg_sequence_data) GETSTRUCT(seqdatatuple);
return seq;
}
/*
* init_params: process the options list of CREATE or ALTER SEQUENCE, and
* store the values into appropriate fields of seqform, for changes that go
* into the pg_sequence catalog, and fields of seqdataform for changes to the
* sequence relation itself. Set *need_seq_rewrite to true if we changed any
* parameters that require rewriting the sequence's relation (interesting for
* ALTER SEQUENCE). Also set *owned_by to any OWNED BY option, or to NIL if
* there is none.
*
* If isInit is true, fill any unspecified options with default values;
* otherwise, do not change existing options that aren't explicitly overridden.
*
* Note: we force a sequence rewrite whenever we change parameters that affect
* generation of future sequence values, even if the seqdataform per se is not
* changed. This allows ALTER SEQUENCE to behave transactionally. Currently,
* the only option that doesn't cause that is OWNED BY. It's *necessary* for
* ALTER SEQUENCE OWNED BY to not rewrite the sequence, because that would
* break pg_upgrade by causing unwanted changes in the sequence's relfilenode.
*/
static void
init_params(ParseState *pstate, List *options, bool for_identity,
bool isInit,
Form_pg_sequence seqform,
Form_pg_sequence_data seqdataform,
bool *need_seq_rewrite,
List **owned_by)
{
DefElem *as_type = NULL;
DefElem *start_value = NULL;
DefElem *restart_value = NULL;
DefElem *increment_by = NULL;
DefElem *max_value = NULL;
DefElem *min_value = NULL;
DefElem *cache_value = NULL;
DefElem *is_cycled = NULL;
ListCell *option;
bool reset_max_value = false;
bool reset_min_value = false;
*need_seq_rewrite = false;
*owned_by = NIL;
foreach(option, options)
{
DefElem *defel = (DefElem *) lfirst(option);
if (strcmp(defel->defname, "as") == 0)
{
if (as_type)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
as_type = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "increment") == 0)
{
if (increment_by)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
increment_by = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "start") == 0)
{
if (start_value)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
start_value = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "restart") == 0)
{
if (restart_value)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
restart_value = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "maxvalue") == 0)
{
if (max_value)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
max_value = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "minvalue") == 0)
{
if (min_value)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
min_value = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "cache") == 0)
{
if (cache_value)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
cache_value = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "cycle") == 0)
{
if (is_cycled)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
is_cycled = defel;
*need_seq_rewrite = true;
}
else if (strcmp(defel->defname, "owned_by") == 0)
{
if (*owned_by)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options"),
parser_errposition(pstate, defel->location)));
*owned_by = defGetQualifiedName(defel);
}
else if (strcmp(defel->defname, "sequence_name") == 0)
{
/*
* The parser allows this, but it is only for identity columns, in
* which case it is filtered out in parse_utilcmd.c. We only get
* here if someone puts it into a CREATE SEQUENCE.
*/
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid sequence option SEQUENCE NAME"),
parser_errposition(pstate, defel->location)));
}
else
elog(ERROR, "option \"%s\" not recognized",
defel->defname);
}
/*
* We must reset log_cnt when isInit or when changing any parameters that
* would affect future nextval allocations.
*/
if (isInit)
seqdataform->log_cnt = 0;
/* AS type */
if (as_type != NULL)
{
Oid newtypid = typenameTypeId(pstate, defGetTypeName(as_type));
if (newtypid != INT2OID &&
newtypid != INT4OID &&
newtypid != INT8OID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
for_identity
? errmsg("identity column type must be smallint, integer, or bigint")
: errmsg("sequence type must be smallint, integer, or bigint")));
if (!isInit)
{
/*
* When changing type and the old sequence min/max values were the
* min/max of the old type, adjust sequence min/max values to
* min/max of new type. (Otherwise, the user chose explicit
* min/max values, which we'll leave alone.)
*/
if ((seqform->seqtypid == INT2OID && seqform->seqmax == PG_INT16_MAX) ||
(seqform->seqtypid == INT4OID && seqform->seqmax == PG_INT32_MAX) ||
(seqform->seqtypid == INT8OID && seqform->seqmax == PG_INT64_MAX))
reset_max_value = true;
if ((seqform->seqtypid == INT2OID && seqform->seqmin == PG_INT16_MIN) ||
(seqform->seqtypid == INT4OID && seqform->seqmin == PG_INT32_MIN) ||
(seqform->seqtypid == INT8OID && seqform->seqmin == PG_INT64_MIN))
reset_min_value = true;
}
seqform->seqtypid = newtypid;
}
else if (isInit)
{
seqform->seqtypid = INT8OID;
}
/* INCREMENT BY */
if (increment_by != NULL)
{
seqform->seqincrement = defGetInt64(increment_by);
if (seqform->seqincrement == 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("INCREMENT must not be zero")));
seqdataform->log_cnt = 0;
}
else if (isInit)
{
seqform->seqincrement = 1;
}
/* CYCLE */
if (is_cycled != NULL)
{
seqform->seqcycle = intVal(is_cycled->arg);
Assert(BoolIsValid(seqform->seqcycle));
seqdataform->log_cnt = 0;
}
else if (isInit)
{
seqform->seqcycle = false;
}
/* MAXVALUE (null arg means NO MAXVALUE) */
if (max_value != NULL && max_value->arg)
{
seqform->seqmax = defGetInt64(max_value);
seqdataform->log_cnt = 0;
}
else if (isInit || max_value != NULL || reset_max_value)
{
if (seqform->seqincrement > 0 || reset_max_value)
{
/* ascending seq */
if (seqform->seqtypid == INT2OID)
seqform->seqmax = PG_INT16_MAX;
else if (seqform->seqtypid == INT4OID)
seqform->seqmax = PG_INT32_MAX;
else
seqform->seqmax = PG_INT64_MAX;
}
else
seqform->seqmax = -1; /* descending seq */
seqdataform->log_cnt = 0;
}
if ((seqform->seqtypid == INT2OID && (seqform->seqmax < PG_INT16_MIN || seqform->seqmax > PG_INT16_MAX))
|| (seqform->seqtypid == INT4OID && (seqform->seqmax < PG_INT32_MIN || seqform->seqmax > PG_INT32_MAX))
|| (seqform->seqtypid == INT8OID && (seqform->seqmax < PG_INT64_MIN || seqform->seqmax > PG_INT64_MAX)))
{
char bufx[100];
snprintf(bufx, sizeof(bufx), INT64_FORMAT, seqform->seqmax);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("MAXVALUE (%s) is out of range for sequence data type %s",
bufx, format_type_be(seqform->seqtypid))));
}
/* MINVALUE (null arg means NO MINVALUE) */
if (min_value != NULL && min_value->arg)
{
seqform->seqmin = defGetInt64(min_value);
seqdataform->log_cnt = 0;
}
else if (isInit || min_value != NULL || reset_min_value)
{
if (seqform->seqincrement < 0 || reset_min_value)
{
/* descending seq */
if (seqform->seqtypid == INT2OID)
seqform->seqmin = PG_INT16_MIN;
else if (seqform->seqtypid == INT4OID)
seqform->seqmin = PG_INT32_MIN;
else
seqform->seqmin = PG_INT64_MIN;
}
else
seqform->seqmin = 1; /* ascending seq */
seqdataform->log_cnt = 0;
}
if ((seqform->seqtypid == INT2OID && (seqform->seqmin < PG_INT16_MIN || seqform->seqmin > PG_INT16_MAX))
|| (seqform->seqtypid == INT4OID && (seqform->seqmin < PG_INT32_MIN || seqform->seqmin > PG_INT32_MAX))
|| (seqform->seqtypid == INT8OID && (seqform->seqmin < PG_INT64_MIN || seqform->seqmin > PG_INT64_MAX)))
{
char bufm[100];
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmin);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("MINVALUE (%s) is out of range for sequence data type %s",
bufm, format_type_be(seqform->seqtypid))));
}
/* crosscheck min/max */
if (seqform->seqmin >= seqform->seqmax)
{
char bufm[100],
bufx[100];
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmin);
snprintf(bufx, sizeof(bufx), INT64_FORMAT, seqform->seqmax);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("MINVALUE (%s) must be less than MAXVALUE (%s)",
bufm, bufx)));
}
/* START WITH */
if (start_value != NULL)
{
seqform->seqstart = defGetInt64(start_value);
}
else if (isInit)
{
if (seqform->seqincrement > 0)
seqform->seqstart = seqform->seqmin; /* ascending seq */
else
seqform->seqstart = seqform->seqmax; /* descending seq */
}
/* crosscheck START */
if (seqform->seqstart < seqform->seqmin)
{
char bufs[100],
bufm[100];
snprintf(bufs, sizeof(bufs), INT64_FORMAT, seqform->seqstart);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmin);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("START value (%s) cannot be less than MINVALUE (%s)",
bufs, bufm)));
}
if (seqform->seqstart > seqform->seqmax)
{
char bufs[100],
bufm[100];
snprintf(bufs, sizeof(bufs), INT64_FORMAT, seqform->seqstart);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmax);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("START value (%s) cannot be greater than MAXVALUE (%s)",
bufs, bufm)));
}
/* RESTART [WITH] */
if (restart_value != NULL)
{
if (restart_value->arg != NULL)
seqdataform->last_value = defGetInt64(restart_value);
else
seqdataform->last_value = seqform->seqstart;
seqdataform->is_called = false;
seqdataform->log_cnt = 0;
}
else if (isInit)
{
seqdataform->last_value = seqform->seqstart;
seqdataform->is_called = false;
}
/* crosscheck RESTART (or current value, if changing MIN/MAX) */
if (seqdataform->last_value < seqform->seqmin)
{
char bufs[100],
bufm[100];
snprintf(bufs, sizeof(bufs), INT64_FORMAT, seqdataform->last_value);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmin);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("RESTART value (%s) cannot be less than MINVALUE (%s)",
bufs, bufm)));
}
if (seqdataform->last_value > seqform->seqmax)
{
char bufs[100],
bufm[100];
snprintf(bufs, sizeof(bufs), INT64_FORMAT, seqdataform->last_value);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, seqform->seqmax);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("RESTART value (%s) cannot be greater than MAXVALUE (%s)",
bufs, bufm)));
}
/* CACHE */
if (cache_value != NULL)
{
seqform->seqcache = defGetInt64(cache_value);
if (seqform->seqcache <= 0)
{
char buf[100];
snprintf(buf, sizeof(buf), INT64_FORMAT, seqform->seqcache);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("CACHE (%s) must be greater than zero",
buf)));
}
seqdataform->log_cnt = 0;
}
else if (isInit)
{
seqform->seqcache = 1;
}
}
/*
* Process an OWNED BY option for CREATE/ALTER SEQUENCE
*
* Ownership permissions on the sequence are already checked,
* but if we are establishing a new owned-by dependency, we must
* enforce that the referenced table has the same owner and namespace
* as the sequence.
*/
static void
process_owned_by(Relation seqrel, List *owned_by, bool for_identity)
{
DependencyType deptype;
int nnames;
Relation tablerel;
AttrNumber attnum;
deptype = for_identity ? DEPENDENCY_INTERNAL : DEPENDENCY_AUTO;
nnames = list_length(owned_by);
Assert(nnames > 0);
if (nnames == 1)
{
/* Must be OWNED BY NONE */
if (strcmp(strVal(linitial(owned_by)), "none") != 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid OWNED BY option"),
errhint("Specify OWNED BY table.column or OWNED BY NONE.")));
tablerel = NULL;
attnum = 0;
}
else
{
List *relname;
char *attrname;
RangeVar *rel;
/* Separate relname and attr name */
relname = list_truncate(list_copy(owned_by), nnames - 1);
attrname = strVal(lfirst(list_tail(owned_by)));
/* Open and lock rel to ensure it won't go away meanwhile */
rel = makeRangeVarFromNameList(relname);
tablerel = relation_openrv(rel, AccessShareLock);
/* Must be a regular or foreign table */
if (!(tablerel->rd_rel->relkind == RELKIND_RELATION ||
tablerel->rd_rel->relkind == RELKIND_FOREIGN_TABLE ||
tablerel->rd_rel->relkind == RELKIND_VIEW ||
tablerel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("referenced relation \"%s\" is not a table or foreign table",
RelationGetRelationName(tablerel))));
/* We insist on same owner and schema */
if (seqrel->rd_rel->relowner != tablerel->rd_rel->relowner)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("sequence must have same owner as table it is linked to")));
if (RelationGetNamespace(seqrel) != RelationGetNamespace(tablerel))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("sequence must be in same schema as table it is linked to")));
/* Now, fetch the attribute number from the system cache */
attnum = get_attnum(RelationGetRelid(tablerel), attrname);
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
attrname, RelationGetRelationName(tablerel))));
}
/*
* Catch user explicitly running OWNED BY on identity sequence.
*/
if (deptype == DEPENDENCY_AUTO)
{
Oid tableId;
int32 colId;
if (sequenceIsOwned(RelationGetRelid(seqrel), DEPENDENCY_INTERNAL, &tableId, &colId))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot change ownership of identity sequence"),
errdetail("Sequence \"%s\" is linked to table \"%s\".",
RelationGetRelationName(seqrel),
get_rel_name(tableId))));
}
/*
* OK, we are ready to update pg_depend. First remove any existing
* dependencies for the sequence, then optionally add a new one.
*/
deleteDependencyRecordsForClass(RelationRelationId, RelationGetRelid(seqrel),
RelationRelationId, deptype);
if (tablerel)
{
ObjectAddress refobject,
depobject;
refobject.classId = RelationRelationId;
refobject.objectId = RelationGetRelid(tablerel);
refobject.objectSubId = attnum;
depobject.classId = RelationRelationId;
depobject.objectId = RelationGetRelid(seqrel);
depobject.objectSubId = 0;
recordDependencyOn(&depobject, &refobject, deptype);
}
/* Done, but hold lock until commit */
if (tablerel)
relation_close(tablerel, NoLock);
}
/*
* Return sequence parameters in a list of the form created by the parser.
*/
List *
sequence_options(Oid relid)
{
HeapTuple pgstuple;
Form_pg_sequence pgsform;
List *options = NIL;
pgstuple = SearchSysCache1(SEQRELID, relid);
if (!HeapTupleIsValid(pgstuple))
elog(ERROR, "cache lookup failed for sequence %u", relid);
pgsform = (Form_pg_sequence) GETSTRUCT(pgstuple);
/* Use makeFloat() for 64-bit integers, like gram.y does. */
options = lappend(options,
makeDefElem("cache", (Node *) makeFloat(psprintf(INT64_FORMAT, pgsform->seqcache)), -1));
options = lappend(options,
makeDefElem("cycle", (Node *) makeInteger(pgsform->seqcycle), -1));
options = lappend(options,
makeDefElem("increment", (Node *) makeFloat(psprintf(INT64_FORMAT, pgsform->seqincrement)), -1));
options = lappend(options,
makeDefElem("maxvalue", (Node *) makeFloat(psprintf(INT64_FORMAT, pgsform->seqmax)), -1));
options = lappend(options,
makeDefElem("minvalue", (Node *) makeFloat(psprintf(INT64_FORMAT, pgsform->seqmin)), -1));
options = lappend(options,
makeDefElem("start", (Node *) makeFloat(psprintf(INT64_FORMAT, pgsform->seqstart)), -1));
ReleaseSysCache(pgstuple);
return options;
}
/*
* Return sequence parameters (formerly for use by information schema)
*/
Datum
pg_sequence_parameters(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
TupleDesc tupdesc;
Datum values[7];
bool isnull[7];
HeapTuple pgstuple;
Form_pg_sequence pgsform;
if (pg_class_aclcheck(relid, GetUserId(), ACL_SELECT | ACL_UPDATE | ACL_USAGE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
get_rel_name(relid))));
tupdesc = CreateTemplateTupleDesc(7);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "start_value",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "minimum_value",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "maximum_value",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "increment",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "cycle_option",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "cache_size",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "data_type",
OIDOID, -1, 0);
BlessTupleDesc(tupdesc);
memset(isnull, 0, sizeof(isnull));
pgstuple = SearchSysCache1(SEQRELID, relid);
if (!HeapTupleIsValid(pgstuple))
elog(ERROR, "cache lookup failed for sequence %u", relid);
pgsform = (Form_pg_sequence) GETSTRUCT(pgstuple);
values[0] = Int64GetDatum(pgsform->seqstart);
values[1] = Int64GetDatum(pgsform->seqmin);
values[2] = Int64GetDatum(pgsform->seqmax);
values[3] = Int64GetDatum(pgsform->seqincrement);
values[4] = BoolGetDatum(pgsform->seqcycle);
values[5] = Int64GetDatum(pgsform->seqcache);
values[6] = ObjectIdGetDatum(pgsform->seqtypid);
ReleaseSysCache(pgstuple);
return HeapTupleGetDatum(heap_form_tuple(tupdesc, values, isnull));
}
/*
* Return the last value from the sequence
*
* Note: This has a completely different meaning than lastval().
*/
Datum
pg_sequence_last_value(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
SeqTable elm;
Relation seqrel;
Buffer buf;
HeapTupleData seqtuple;
Form_pg_sequence_data seq;
bool is_called;
int64 result;
/* open and lock sequence */
init_sequence(relid, &elm, &seqrel);
if (pg_class_aclcheck(relid, GetUserId(), ACL_SELECT | ACL_USAGE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
seq = read_seq_tuple(seqrel, &buf, &seqtuple);
is_called = seq->is_called;
result = seq->last_value;
UnlockReleaseBuffer(buf);
relation_close(seqrel, NoLock);
if (is_called)
PG_RETURN_INT64(result);
else
PG_RETURN_NULL();
}
void
seq_redo(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
Buffer buffer;
Page page;
Page localpage;
char *item;
Size itemsz;
xl_seq_rec *xlrec = (xl_seq_rec *) XLogRecGetData(record);
sequence_magic *sm;
if (info != XLOG_SEQ_LOG)
elog(PANIC, "seq_redo: unknown op code %u", info);
buffer = XLogInitBufferForRedo(record, 0);
page = (Page) BufferGetPage(buffer);
/*
* We always reinit the page. However, since this WAL record type is also
* used for updating sequences, it's possible that a hot-standby backend
* is examining the page concurrently; so we mustn't transiently trash the
* buffer. The solution is to build the correct new page contents in
* local workspace and then memcpy into the buffer. Then only bytes that
* are supposed to change will change, even transiently. We must palloc
* the local page for alignment reasons.
*/
localpage = (Page) palloc(BufferGetPageSize(buffer));
PageInit(localpage, BufferGetPageSize(buffer), sizeof(sequence_magic));
sm = (sequence_magic *) PageGetSpecialPointer(localpage);
sm->magic = SEQ_MAGIC;
item = (char *) xlrec + sizeof(xl_seq_rec);
itemsz = XLogRecGetDataLen(record) - sizeof(xl_seq_rec);
if (PageAddItem(localpage, (Item) item, itemsz,
FirstOffsetNumber, false, false) == InvalidOffsetNumber)
elog(PANIC, "seq_redo: failed to add item to page");
PageSetLSN(localpage, lsn);
memcpy(page, localpage, BufferGetPageSize(buffer));
MarkBufferDirty(buffer);
UnlockReleaseBuffer(buffer);
pfree(localpage);
}
/*
* Flush cached sequence information.
*/
void
ResetSequenceCaches(void)
{
if (seqhashtab)
{
hash_destroy(seqhashtab);
seqhashtab = NULL;
}
last_used_seq = NULL;
}
/*
* Mask a Sequence page before performing consistency checks on it.
*/
void
seq_mask(char *page, BlockNumber blkno)
{
mask_page_lsn_and_checksum(page);
mask_unused_space(page);
}