bool PersistentFilespace_TryGetFilespacePathUnderLock(
Oid filespaceOid,
char **filespaceLocation)
{
FilespaceDirEntry filespaceDirEntry;
char *primaryBlankPadded = NULL;
*filespaceLocation = NULL;
#ifdef MASTER_MIRROR_SYNC
/*
* Can't rely on persistent tables or memory structures on the standby so
* get it from the cache maintained by the master mirror sync code
*/
if (GPStandby())
{
return mmxlog_filespace_get_path(
filespaceOid,
filespaceLocation);
}
#endif
/*
* Important to make this call AFTER we check if we are the Standby Master.
*/
PersistentFilespace_VerifyInitScan();
filespaceDirEntry =
PersistentFilespace_FindDirUnderLock(
filespaceOid);
if (filespaceDirEntry == NULL)
return false;
/*
* The persistent_filespace_node_table contains the paths for both the
* primary and mirror nodes, and the table is the same on both sides of the
* mirror. When it was first created the primary put its location first,
* but we don't know if we were the primary when it was created or not. To
* determine which path corresponds to this node we compare our dbid to the
* one stored in the table.
*/
primaryBlankPadded = filespaceDirEntry->locationBlankPadded1;
/* These should both have been populated by one of the cases above */
Assert(primaryBlankPadded);
PersistentFilespace_ConvertBlankPaddedLocation(
filespaceLocation,
primaryBlankPadded,
/* isPrimary */ true);
return true;
}
static void
PersistentFilespace_GetPaths(FilespaceDirEntry filespaceDirEntry,
char **primaryFilespaceLocation,
char **mirrorFilespaceLocation)
{
int16 primaryDbId;
char *primaryBlankPadded = NULL;
char *mirrorBlankPadded = NULL;
/*
* The persistent_filespace_node_table contains the paths for both the
* primary and mirror nodes, and the table is the same on both sides of the
* mirror. When it was first created the primary put its location first,
* but we don't know if we were the primary when it was created or not. To
* determine which path corresponds to this node we compare our dbid to the
* one stored in the table.
*/
primaryDbId = GpIdentity.dbid;
if (filespaceDirEntry->dbId1 == primaryDbId)
{
/* dbid == dbid1 */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded1;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded2;
}
else if (filespaceDirEntry->dbId2 == primaryDbId)
{
/* dbid == dbid2 */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded2;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded1;
}
else
{
/*
* The dbid check above does not work for the Master Node during
* initial startup, because the master doesn't yet know its own dbid.
* To handle this we special case for the master node the master
* always considers the first entry as the correct location.
*
* Note: This design may need to be reconsidered to handle standby
* masters!
*/
PrimaryMirrorMode mode;
getPrimaryMirrorStatusCodes(&mode, NULL, NULL, NULL);
if (mode == PMModeMaster)
{
/* Master node */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded1;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded2;
}
else
{
/*
* Current dbid matches neither dbid in table and was not started
* as a master node.
*/
ereport(FATAL,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("Unable to determine dbid for filespace lookup")));
}
}
/* These should both have been populated by one of the cases above */
Assert(primaryBlankPadded);
Assert(mirrorBlankPadded);
PersistentFilespace_ConvertBlankPaddedLocation(
primaryFilespaceLocation,
primaryBlankPadded,
/* isPrimary */ true);
PersistentFilespace_ConvertBlankPaddedLocation(
mirrorFilespaceLocation,
mirrorBlankPadded,
/* isPrimary */ false);
}
bool PersistentFilespace_TryGetPrimaryAndMirrorUnderLock(
Oid filespaceOid,
/* The filespace OID to lookup. */
char **primaryFilespaceLocation,
/* The primary filespace directory path. Return NULL for global and base. */
char **mirrorFilespaceLocation)
/* The primary filespace directory path. Return NULL for global and base.
* Or, returns NULL when mirror not configured. */
{
FilespaceDirEntry filespaceDirEntry;
int16 primaryDbId;
char *primaryBlankPadded = NULL;
char *mirrorBlankPadded = NULL;
*primaryFilespaceLocation = NULL;
*mirrorFilespaceLocation = NULL;
#ifdef MASTER_MIRROR_SYNC
/*
* Can't rely on persistent tables or memory structures on the standby so
* get it from the cache maintained by the master mirror sync code
*/
if (IsStandbyMode())
{
return mmxlog_filespace_get_path(
filespaceOid,
primaryFilespaceLocation);
}
#endif
/*
* Important to make this call AFTER we check if we are the Standby Master.
*/
PersistentFilespace_VerifyInitScan();
filespaceDirEntry =
PersistentFilespace_FindDirUnderLock(
filespaceOid);
if (filespaceDirEntry == NULL)
return false;
/*
* The persistent_filespace_node_table contains the paths for both the
* primary and mirror nodes, and the table is the same on both sides of the
* mirror. When it was first created the primary put its location first,
* but we don't know if we were the primary when it was created or not. To
* determine which path corresponds to this node we compare our dbid to the
* one stored in the table.
*/
primaryDbId = GpIdentity.dbid;
if (filespaceDirEntry->dbId1 == primaryDbId)
{
/* dbid == dbid1 */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded1;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded2;
}
else if (filespaceDirEntry->dbId2 == primaryDbId)
{
/* dbid == dbid2 */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded2;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded1;
}
else
{
/*
* The dbid check above does not work for the Master Node during
* initial startup, because the master doesn't yet know its own dbid.
* To handle this we special case for the master node the master
* always considers the first entry as the correct location.
*
* Note: This design may need to be reconsidered to handle standby
* masters!
*/
PrimaryMirrorMode mode;
getPrimaryMirrorStatusCodes(&mode, NULL, NULL, NULL);
if (mode == PMModeMaster)
{
/* Master node */
primaryBlankPadded = filespaceDirEntry->locationBlankPadded1;
mirrorBlankPadded = filespaceDirEntry->locationBlankPadded2;
}
else
{
/*
* Current dbid matches neither dbid in table and was not started
* as a master node.
*/
ereport(FATAL,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("Unable to determine dbid for filespace lookup")));
}
}
/* These should both have been populated by one of the cases above */
Assert(primaryBlankPadded);
Assert(mirrorBlankPadded);
PersistentFilespace_ConvertBlankPaddedLocation(
primaryFilespaceLocation,
primaryBlankPadded,
/* isPrimary */ true);
PersistentFilespace_ConvertBlankPaddedLocation(
mirrorFilespaceLocation,
mirrorBlankPadded,
/* isPrimary */ false);
return true;
}
