/*
* AtEOXact_LargeObject -
* prepares large objects for transaction commit
*/
void
AtEOXact_LargeObject(bool isCommit)
{
int i;
if (fscxt == NULL)
return; /* no LO operations in this xact */
/*
* Close LO fds and clear cookies array so that LO fds are no longer good.
* On abort we skip the close step.
*/
for (i = 0; i < cookies_size; i++)
{
if (cookies[i] != NULL)
{
if (isCommit)
inv_close(cookies[i]);
deleteLOfd(i);
}
}
/* Needn't actually pfree since we're about to zap context */
cookies = NULL;
cookies_size = 0;
/* Release the LO memory context to prevent permanent memory leaks. */
MemoryContextDelete(fscxt);
fscxt = NULL;
/* Give inv_api.c a chance to clean up, too */
close_lo_relation(isCommit);
}
/*
* AtEOSubXact_LargeObject
* Take care of large objects at subtransaction commit/abort
*
* Reassign LOs created/opened during a committing subtransaction
* to the parent subtransaction. On abort, just close them.
*/
void
AtEOSubXact_LargeObject(bool isCommit, SubTransactionId mySubid,
SubTransactionId parentSubid)
{
int i;
if (fscxt == NULL) /* no LO operations in this xact */
return;
for (i = 0; i < cookies_size; i++)
{
LargeObjectDesc *lo = cookies[i];
if (lo != NULL && lo->subid == mySubid)
{
if (isCommit)
lo->subid = parentSubid;
else
{
/*
* Make sure we do not call inv_close twice if it errors out
* for some reason. Better a leak than a crash.
*/
deleteLOfd(i);
inv_close(lo);
}
}
}
}
Datum
lo_unlink(PG_FUNCTION_ARGS)
{
Oid lobjId = PG_GETARG_OID(0);
/* Must be owner of the largeobject */
if (!lo_compat_privileges &&
!pg_largeobject_ownercheck(lobjId, GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be owner of large object %u", lobjId)));
/*
* If there are any open LO FDs referencing that ID, close 'em.
*/
if (fscxt != NULL)
{
int i;
for (i = 0; i < cookies_size; i++)
{
if (cookies[i] != NULL && cookies[i]->id == lobjId)
{
inv_close(cookies[i]);
deleteLOfd(i);
}
}
}
/*
* inv_drop does not create a need for end-of-transaction cleanup and
* hence we don't need to have created fscxt.
*/
PG_RETURN_INT32(inv_drop(lobjId));
}
Datum
lo_close(PG_FUNCTION_ARGS)
{
int32 fd = PG_GETARG_INT32(0);
#ifdef PGXC
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Postgres-XC does not support large object yet"),
errdetail("The feature is not currently supported")));
#endif
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
#if FSDB
elog(DEBUG4, "lo_close(%d)", fd);
#endif
inv_close(cookies[fd]);
deleteLOfd(fd);
PG_RETURN_INT32(0);
}
Datum
lo_unlink(PG_FUNCTION_ARGS)
{
Oid lobjId = PG_GETARG_OID(0);
/*
* If there are any open LO FDs referencing that ID, close 'em.
*/
if (fscxt != NULL)
{
int i;
for (i = 0; i < cookies_size; i++)
{
if (cookies[i] != NULL && cookies[i]->id == lobjId)
{
inv_close(cookies[i]);
deleteLOfd(i);
}
}
}
/*
* inv_drop does not create a need for end-of-transaction cleanup and
* hence we don't need to have created fscxt.
*/
PG_RETURN_INT32(inv_drop(lobjId));
}
Datum
lo_unlink(PG_FUNCTION_ARGS)
{
Oid lobjId = PG_GETARG_OID(0);
#ifdef PGXC
#ifdef XCP
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Postgres-XL does not yet support large objects"),
errdetail("The feature is not currently supported")));
#else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Postgres-XC does not support large object yet"),
errdetail("The feature is not currently supported")));
#endif
#endif
/* Must be owner of the largeobject */
if (!lo_compat_privileges &&
!pg_largeobject_ownercheck(lobjId, GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be owner of large object %u", lobjId)));
/*
* If there are any open LO FDs referencing that ID, close 'em.
*/
if (fscxt != NULL)
{
int i;
for (i = 0; i < cookies_size; i++)
{
if (cookies[i] != NULL && cookies[i]->id == lobjId)
{
inv_close(cookies[i]);
deleteLOfd(i);
}
}
}
/*
* inv_drop does not create a need for end-of-transaction cleanup and
* hence we don't need to have created fscxt.
*/
PG_RETURN_INT32(inv_drop(lobjId));
}
Datum
lo_close(PG_FUNCTION_ARGS)
{
int32 fd = PG_GETARG_INT32(0);
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
#if FSDB
elog(DEBUG4, "lo_close(%d)", fd);
#endif
inv_close(cookies[fd]);
deleteLOfd(fd);
PG_RETURN_INT32(0);
}