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/*-------------------------------------------------------------------------
*
* relpath.h
* Declarations for GetRelationPath() and friends
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/common/relpath.h
*
*-------------------------------------------------------------------------
*/
#ifndef RELPATH_H
#define RELPATH_H
/*
* Stuff for fork names.
*
* The physical storage of a relation consists of one or more forks.
* The main fork is always created, but in addition to that there can be
* additional forks for storing various metadata. ForkNumber is used when
* we need to refer to a specific fork in a relation.
*/
typedef enum ForkNumber
{
InvalidForkNumber = -1,
MAIN_FORKNUM = 0,
FSM_FORKNUM,
VISIBILITYMAP_FORKNUM,
INIT_FORKNUM
/*
* NOTE: if you add a new fork, change MAX_FORKNUM and possibly
* FORKNAMECHARS below, and update the forkNames array in
* src/common/relpath.c
*/
} ForkNumber;
#define MAX_FORKNUM INIT_FORKNUM
#define FORKNAMECHARS 4 /* max chars for a fork name */
extern const char *const forkNames[];
extern ForkNumber forkname_to_number(const char *forkName);
extern int forkname_chars(const char *str, ForkNumber *fork);
/*
* Stuff for computing filesystem pathnames for relations.
*/
extern char *GetDatabasePath(Oid dbNode, Oid spcNode);
extern char *GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
int backendId, ForkNumber forkNumber);
/*
* Wrapper macros for GetRelationPath. Beware of multiple
* evaluation of the RelFileNode or RelFileNodeBackend argument!
*/
/* First argument is a RelFileNode */
#define relpathbackend(rnode, backend, forknum) \
GetRelationPath((rnode).dbNode, (rnode).spcNode, (rnode).relNode, \
backend, forknum)
/* First argument is a RelFileNode */
#define relpathperm(rnode, forknum) \
relpathbackend(rnode, InvalidBackendId, forknum)
/* First argument is a RelFileNodeBackend */
#define relpath(rnode, forknum) \
relpathbackend((rnode).node, (rnode).backend, forknum)
#endif /* RELPATH_H */