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Arrange for the postmaster (and standalone backends, initdb, etc) to

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chdir into PGDATA and subsequently use relative paths instead of absolute
paths to access all files under PGDATA.  This seems to give a small
performance improvement, and it should make the system more robust
against naive DBAs doing things like moving a database directory that
has a live postmaster in it.  Per recent discussion.
This commit is contained in:
Tom Lane
2005-07-04 04:51:52 +00:00
parent 7504f0bae8
commit eb5949d190
27 changed files with 364 additions and 474 deletions
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36
src/backend/utils/init/flatfiles.c
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@ -23,7 +23,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.11 2005/06/29 20:34:15 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.12 2005/07/04 04:51:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -50,9 +50,9 @@
#include "utils/syscache.h"
/* Actual names of the flat files (within $PGDATA/global/) */
#define DATABASE_FLAT_FILE "pg_database"
#define AUTH_FLAT_FILE "pg_auth"
/* Actual names of the flat files (within $PGDATA) */
#define DATABASE_FLAT_FILE "global/pg_database"
#define AUTH_FLAT_FILE "global/pg_auth"
/* Info bits in a flatfiles 2PC record */
#define FF_BIT_DATABASE 1
@ -98,41 +98,29 @@ auth_file_update_needed(void)
/*
* database_getflatfilename --- get full pathname of database file
* database_getflatfilename --- get pathname of database file
*
* Note that result string is palloc'd, and should be freed by the caller.
* (This convention is not really needed anymore, since the relative path
* is fixed.)
*/
char *
database_getflatfilename(void)
{
int bufsize;
char *pfnam;
bufsize = strlen(DataDir) + strlen("/global/") +
strlen(DATABASE_FLAT_FILE) + 1;
pfnam = (char *) palloc(bufsize);
snprintf(pfnam, bufsize, "%s/global/%s", DataDir, DATABASE_FLAT_FILE);
return pfnam;
return pstrdup(DATABASE_FLAT_FILE);
}
/*
* auth_getflatfilename --- get full pathname of auth file
* auth_getflatfilename --- get pathname of auth file
*
* Note that result string is palloc'd, and should be freed by the caller.
* (This convention is not really needed anymore, since the relative path
* is fixed.)
*/
char *
auth_getflatfilename(void)
{
int bufsize;
char *pfnam;
bufsize = strlen(DataDir) + strlen("/global/") +
strlen(AUTH_FLAT_FILE) + 1;
pfnam = (char *) palloc(bufsize);
snprintf(pfnam, bufsize, "%s/global/%s", DataDir, AUTH_FLAT_FILE);
return pfnam;
return pstrdup(AUTH_FLAT_FILE);
}