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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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57
src/backend/postmaster/pgstat.c
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@@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2005, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.98 2005/06/29 22:51:55 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.99 2005/07/04 04:51:47 tgl Exp $
* ----------
*/
#include "postgres.h"
@@ -54,12 +54,11 @@
/* ----------
* Paths for the statistics files. The %s is replaced with the
* installation's $PGDATA.
* Paths for the statistics files (relative to installation's $PGDATA).
* ----------
*/
#define PGSTAT_STAT_FILENAME "%s/global/pgstat.stat"
#define PGSTAT_STAT_TMPFILE "%s/global/pgstat.tmp.%d"
#define PGSTAT_STAT_FILENAME "global/pgstat.stat"
#define PGSTAT_STAT_TMPFILE "global/pgstat.tmp"
/* ----------
* Timer definitions.
@@ -134,9 +133,6 @@ static HTAB *pgStatBeDead = NULL;
static PgStat_StatBeEntry *pgStatBeTable = NULL;
static int pgStatNumBackends = 0;
static char pgStat_fname[MAXPGPATH];
static char pgStat_tmpfname[MAXPGPATH];
/* ----------
* Local function forward declarations
@@ -220,21 +216,12 @@ pgstat_init(void)
pgstat_collect_blocklevel)
pgstat_collect_startcollector = true;
/*
* Initialize the filename for the status reports. (In the
* EXEC_BACKEND case, this only sets the value in the postmaster. The
* collector subprocess will recompute the value for itself, and
* individual backends must do so also if they want to access the
* file.)
*/
snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
/*
* If we don't have to start a collector or should reset the collected
* statistics on postmaster start, simply remove the file.
* statistics on postmaster start, simply remove the stats file.
*/
if (!pgstat_collect_startcollector || pgstat_collect_resetonpmstart)
unlink(pgStat_fname);
unlink(PGSTAT_STAT_FILENAME);
/*
* Nothing else required if collector will not get started
@@ -1470,14 +1457,6 @@ PgstatCollectorMain(int argc, char *argv[])
init_ps_display("stats collector process", "", "");
set_ps_display("");
/*
* Initialize filenames needed for status reports.
*/
snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
/* tmpfname need only be set correctly in this process */
snprintf(pgStat_tmpfname, MAXPGPATH, PGSTAT_STAT_TMPFILE,
DataDir, (int)getpid());
/*
* Arrange to write the initial status file right away
*/
@@ -2161,13 +2140,13 @@ pgstat_write_statsfile(void)
/*
* Open the statistics temp file to write out the current values.
*/
fpout = fopen(pgStat_tmpfname, PG_BINARY_W);
fpout = fopen(PGSTAT_STAT_TMPFILE, PG_BINARY_W);
if (fpout == NULL)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open temporary statistics file \"%s\": %m",
pgStat_tmpfname)));
PGSTAT_STAT_TMPFILE)));
return;
}
@@ -2276,16 +2255,16 @@ pgstat_write_statsfile(void)
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not close temporary statistics file \"%s\": %m",
pgStat_tmpfname)));
PGSTAT_STAT_TMPFILE)));
}
else
{
if (rename(pgStat_tmpfname, pgStat_fname) < 0)
if (rename(PGSTAT_STAT_TMPFILE, PGSTAT_STAT_FILENAME) < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
pgStat_tmpfname, pgStat_fname)));
PGSTAT_STAT_TMPFILE, PGSTAT_STAT_FILENAME)));
}
}
@@ -2376,24 +2355,12 @@ pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
if (betab != NULL)
*betab = NULL;
/*
* In EXEC_BACKEND case, we won't have inherited pgStat_fname from
* postmaster, so compute it first time through.
*/
#ifdef EXEC_BACKEND
if (pgStat_fname[0] == '\0')
{
Assert(DataDir != NULL);
snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
}
#endif
/*
* Try to open the status file. If it doesn't exist, the backends
* simply return zero for anything and the collector simply starts
* from scratch with empty counters.
*/
if ((fpin = AllocateFile(pgStat_fname, PG_BINARY_R)) == NULL)
if ((fpin = AllocateFile(PGSTAT_STAT_FILENAME, PG_BINARY_R)) == NULL)
return;
/*