pg_tablespace.h File Reference

#include "catalog/genbki.h"
#include "catalog/pg_tablespace_d.h"

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Typedefs
typedef FormData_pg_tablespace *	Form_pg_tablespace

Functions
	CATALOG (pg_tablespace, 1213, TableSpaceRelationId) BKI_SHARED_RELATION
	DECLARE_TOAST_WITH_MACRO (pg_tablespace, 4185, 4186, PgTablespaceToastTable, PgTablespaceToastIndex)
	DECLARE_UNIQUE_INDEX_PKEY (pg_tablespace_oid_index, 2697, TablespaceOidIndexId, pg_tablespace, btree(oid oid_ops))
	DECLARE_UNIQUE_INDEX (pg_tablespace_spcname_index, 2698, TablespaceNameIndexId, pg_tablespace, btree(spcname name_ops))
	MAKE_SYSCACHE (TABLESPACEOID, pg_tablespace_oid_index, 4)
char *	get_tablespace_location (Oid tablespaceOid)

Variables
	FormData_pg_tablespace

Typedef Documentation

Form_pg_tablespace

typedef FormData_pg_tablespace* Form_pg_tablespace

Definition at line 48 of file pg_tablespace.h.

Function Documentation

CATALOG()

CATALOG	(	pg_tablespace	,
		1213	,
		TableSpaceRelationId
	)

Definition at line 29 of file pg_tablespace.h.

{
    Oid         oid;            /* oid */
    NameData    spcname;        /* tablespace name */
 
    /* owner of tablespace */
    Oid         spcowner BKI_DEFAULT(POSTGRES) BKI_LOOKUP(pg_authid);
 
#ifdef CATALOG_VARLEN           /* variable-length fields start here */
    aclitem     spcacl[1];      /* access permissions */
    text        spcoptions[1];  /* per-tablespace options */
#endif
} FormData_pg_tablespace;

References BKI_DEFAULT, and BKI_LOOKUP.

DECLARE_TOAST_WITH_MACRO()

DECLARE_TOAST_WITH_MACRO	(	pg_tablespace	,
		4185	,
		4186	,
		PgTablespaceToastTable	,
		PgTablespaceToastIndex
	)

DECLARE_UNIQUE_INDEX()

DECLARE_UNIQUE_INDEX	(	pg_tablespace_spcname_index	,
		2698	,
		TablespaceNameIndexId	,
		pg_tablespace	,
		btree(spcname name_ops)
	)

DECLARE_UNIQUE_INDEX_PKEY()

DECLARE_UNIQUE_INDEX_PKEY	(	pg_tablespace_oid_index	,
		2697	,
		TablespaceOidIndexId	,
		pg_tablespace	,
		btree(oid oid_ops)
	)

get_tablespace_location()

char * get_tablespace_location

(

Oid

tablespaceOid

)

Definition at line 30 of file pg_tablespace.c.

{
    char        sourcepath[MAXPGPATH];
    char        targetpath[MAXPGPATH];
    int         rllen;
    struct stat st;
 
    /*
     * It's useful to apply this to pg_class.reltablespace, wherein zero means
     * "the database's default tablespace".  So, rather than throwing an error
     * for zero, we choose to assume that's what is meant.
     */
    if (tablespaceOid == InvalidOid)
        tablespaceOid = MyDatabaseTableSpace;
 
    /*
     * Return empty string for the cluster's default tablespaces
     */
    if (tablespaceOid == DEFAULTTABLESPACE_OID ||
        tablespaceOid == GLOBALTABLESPACE_OID)
        return pstrdup("");
 
    /*
     * Find the location of the tablespace by reading the symbolic link that
     * is in pg_tblspc/<oid>.
     */
    snprintf(sourcepath, sizeof(sourcepath), "%s/%u", PG_TBLSPC_DIR, tablespaceOid);
 
    /*
     * Before reading the link, check if the source path is a link or a
     * junction point.  Note that a directory is possible for a tablespace
     * created with allow_in_place_tablespaces enabled.  If a directory is
     * found, a relative path to the data directory is returned.
     */
    if (lstat(sourcepath, &st) < 0)
        ereport(ERROR,
                errcode_for_file_access(),
                errmsg("could not stat file \"%s\": %m",
                       sourcepath));
 
    if (!S_ISLNK(st.st_mode))
        return pstrdup(sourcepath);
 
    /*
     * In presence of a link or a junction point, return the path pointed to.
     */
    rllen = readlink(sourcepath, targetpath, sizeof(targetpath));
    if (rllen < 0)
        ereport(ERROR,
                errcode_for_file_access(),
                errmsg("could not read symbolic link \"%s\": %m",
                       sourcepath));
    if (rllen >= sizeof(targetpath))
        ereport(ERROR,
                errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
                errmsg("symbolic link \"%s\" target is too long",
                       sourcepath));
    targetpath[rllen] = '\0';
 
    return pstrdup(targetpath);
}

References ereport, errcode(), errcode_for_file_access(), errmsg(), ERROR, InvalidOid, lstat, MAXPGPATH, MyDatabaseTableSpace, PG_TBLSPC_DIR, pstrdup(), readlink, S_ISLNK, snprintf, and stat::st_mode.

Referenced by pg_tablespace_location().

MAKE_SYSCACHE()

MAKE_SYSCACHE	(	TABLESPACEOID	,
		pg_tablespace_oid_index	,
		4
	)

Variable Documentation

FormData_pg_tablespace

FormData_pg_tablespace

Definition at line 41 of file pg_tablespace.h.