/* *Informationaboutatablespace * *Insomeusages,"path"canbeNULLtodenotethePGDATAdirectoryitself.
*/ typedefstruct
{
Oid oid; /* tablespace's OID */ char *path; /* full path to tablespace's directory */ char *rpath; /* relative path if it's within PGDATA, else
* NULL */
int64 size; /* total size as sent; -1 if not known */
} tablespaceinfo;