bool
PersistentFilespace_TryGetPrimaryAndMirror(
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;
bool result = false;
*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();
LWLockAcquire(FilespaceHashLock, LW_SHARED);
filespaceDirEntry = PersistentFilespace_FindDirUnderLock(filespaceOid);
if (filespaceDirEntry)
{
PersistentFilespace_GetPaths(filespaceDirEntry,
primaryFilespaceLocation,
mirrorFilespaceLocation);
result = true;
}
LWLockRelease(FilespaceHashLock);
return result;
}
PersistentTablespaceGetFilespaces
PersistentFilespace_GetFilespaceFromTablespace(Oid tablespaceOid,
char **primaryFilespaceLocation,
char **mirrorFilespaceLocation,
Oid *filespaceOid)
{
bool found;
TablespaceDirEntry tablespaceDirEntry;
TablespaceDirEntryKey tsKey;
FilespaceDirEntry filespaceDirEntry;
FilespaceDirEntryKey fsKey;
PersistentTablespaceGetFilespaces result;
if (persistentTablespaceSharedHashTable == NULL)
elog(PANIC, "persistent tablespace shared-memory not setup");
if (persistentFilespaceSharedHashTable == NULL)
elog(PANIC, "persistent filespace shared-memory not setup");
LWLockAcquire(FilespaceHashLock, LW_SHARED);
LWLockAcquire(TablespaceHashLock, LW_SHARED);
tsKey.tablespaceOid = tablespaceOid;
tablespaceDirEntry = (TablespaceDirEntry) hash_search(
persistentTablespaceSharedHashTable, (void *) &tsKey,
HASH_FIND, &found);
if (found)
{
fsKey.filespaceOid = *filespaceOid = tablespaceDirEntry->filespaceOid;
filespaceDirEntry = (FilespaceDirEntry) hash_search(
persistentFilespaceSharedHashTable, (void *) &fsKey,
HASH_FIND, &found);
if (found)
{
result = PersistentTablespaceGetFilespaces_Ok;
}
else
result = PersistentTablespaceGetFilespaces_FilespaceNotFound;
}
else
result = PersistentTablespaceGetFilespaces_TablespaceNotFound;
if (result == PersistentTablespaceGetFilespaces_Ok)
PersistentFilespace_GetPaths(filespaceDirEntry,
primaryFilespaceLocation,
mirrorFilespaceLocation);
LWLockRelease(TablespaceHashLock);
LWLockRelease(FilespaceHashLock);
return result;
}
