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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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4
src/include/access/slru.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/slru.h,v 1.11 2004/12/31 22:03:21 pgsql Exp $
* $PostgreSQL: pgsql/src/include/access/slru.h,v 1.12 2005/07/04 04:51:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -87,7 +87,7 @@ typedef struct SlruCtlData
* Dir is set during SimpleLruInit and does not change thereafter.
* Since it's always the same, it doesn't need to be in shared memory.
*/
char Dir[MAXPGPATH];
char Dir[64];
} SlruCtlData;
typedef SlruCtlData *SlruCtl;

3
src/include/access/xlog.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.65 2005/06/08 15:50:28 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.66 2005/07/04 04:51:52 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -158,7 +158,6 @@ extern void xlog_desc(char *buf, uint8 xl_info, char *rec);
extern void UpdateControlFile(void);
extern int XLOGShmemSize(void);
extern void XLOGShmemInit(void);
extern void XLOGPathInit(void);
extern void BootStrapXLOG(void);
extern void StartupXLOG(void);
extern void ShutdownXLOG(int code, Datum arg);

18
src/include/access/xlog_internal.h
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@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.8 2005/06/06 17:01:25 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.9 2005/07/04 04:51:52 tgl Exp $
*/
#ifndef XLOG_INTERNAL_H
#define XLOG_INTERNAL_H
@@ -185,6 +185,12 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
((xrecoff) % BLCKSZ >= SizeOfXLogShortPHD && \
(BLCKSZ - (xrecoff) % BLCKSZ) >= SizeOfXLogRecord)
/*
* The XLog directory and control file (relative to $PGDATA)
*/
#define XLOGDIR "pg_xlog"
#define XLOG_CONTROL_FILE "global/pg_control"
/*
* These macros encapsulate knowledge about the exact layout of XLog file
* names, timeline history file names, and archive-status file names.
@@ -195,24 +201,22 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
snprintf(fname, MAXFNAMELEN, "%08X%08X%08X", tli, log, seg)
#define XLogFilePath(path, tli, log, seg) \
snprintf(path, MAXPGPATH, "%s/%08X%08X%08X", XLogDir, tli, log, seg)
snprintf(path, MAXPGPATH, XLOGDIR "/%08X%08X%08X", tli, log, seg)
#define TLHistoryFileName(fname, tli) \
snprintf(fname, MAXFNAMELEN, "%08X.history", tli)
#define TLHistoryFilePath(path, tli) \
snprintf(path, MAXPGPATH, "%s/%08X.history", XLogDir, tli)
snprintf(path, MAXPGPATH, XLOGDIR "/%08X.history", tli)
#define StatusFilePath(path, xlog, suffix) \
snprintf(path, MAXPGPATH, "%s/archive_status/%s%s", XLogDir, xlog, suffix)
snprintf(path, MAXPGPATH, XLOGDIR "/archive_status/%s%s", xlog, suffix)
#define BackupHistoryFileName(fname, tli, log, seg, offset) \
snprintf(fname, MAXFNAMELEN, "%08X%08X%08X.%08X.backup", tli, log, seg, offset)
#define BackupHistoryFilePath(path, tli, log, seg, offset) \
snprintf(path, MAXPGPATH, "%s/%08X%08X%08X.%08X.backup", XLogDir, tli, log, seg, offset)
extern char XLogDir[MAXPGPATH];
snprintf(path, MAXPGPATH, XLOGDIR "/%08X%08X%08X.%08X.backup", tli, log, seg, offset)
/*