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Support syncing WAL log to disk using either fsync(), fdatasync(),

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O_SYNC, or O_DSYNC (as available on a given platform).  Add GUC parameter
to control sync method.
Also, add defense to XLogWrite to prevent it from going nuts if passed
a target write position that's past the end of the buffers so far filled
by XLogInsert.
This commit is contained in:
Tom Lane
2001-03-16 05:44:33 +00:00
parent 4eb5e27a28
commit 9d645fd84c
6 changed files with 287 additions and 62 deletions
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50
src/backend/utils/misc/guc.c
View File

@ -4,7 +4,7 @@
* Support for grand unified configuration scheme, including SET
* command, configuration file, and command line options.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.32 2001/03/13 01:17:06 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.33 2001/03/16 05:44:33 tgl Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -20,6 +20,7 @@
#include "utils/guc.h"
#include "access/xlog.h"
#include "commands/async.h"
#include "libpq/auth.h"
#include "libpq/pqcomm.h"
@ -33,23 +34,17 @@
#include "tcop/tcopprot.h"
/* XXX should be in a header file */
/* XXX these should be in other modules' header files */
extern bool Log_connections;
extern int CheckPointSegments;
extern int CheckPointTimeout;
extern int XLOGbuffers;
extern int XLOGfiles;
extern int XLOG_DEBUG;
extern int CommitDelay;
extern int CommitSiblings;
extern bool FixBTree;
#ifdef ENABLE_SYSLOG
extern char *Syslog_facility;
extern char *Syslog_ident;
bool check_facility(const char *facility);
static bool check_facility(const char *facility);
#endif
/*
@ -138,7 +133,8 @@ struct config_string
GucContext context;
char **variable;
const char *default_val;
bool (*parse_hook)(const char *);
bool (*parse_hook)(const char *proposed);
void (*assign_hook)(const char *newval);
};
@ -330,25 +326,29 @@ static struct config_string
ConfigureNamesString[] =
{
{"krb_server_keyfile", PGC_POSTMASTER, &pg_krb_server_keyfile,
PG_KRB_SRVTAB, NULL},
{"unix_socket_group", PGC_POSTMASTER, &Unix_socket_group,
"", NULL},
PG_KRB_SRVTAB, NULL, NULL},
#ifdef ENABLE_SYSLOG
{"syslog_facility", PGC_POSTMASTER, &Syslog_facility,
"LOCAL0", check_facility},
"LOCAL0", check_facility, NULL},
{"syslog_ident", PGC_POSTMASTER, &Syslog_ident,
"postgres", NULL},
"postgres", NULL, NULL},
#endif
{"unix_socket_group", PGC_POSTMASTER, &Unix_socket_group,
"", NULL, NULL},
{"unix_socket_directory", PGC_POSTMASTER, &UnixSocketDir,
"", NULL},
"", NULL, NULL},
{"virtual_host", PGC_POSTMASTER, &VirtualHost,
"", NULL},
"", NULL, NULL},
{NULL, 0, NULL, NULL, NULL}
{"wal_sync_method", PGC_SIGHUP, &XLOG_sync_method,
XLOG_sync_method_default,
check_xlog_sync_method, assign_xlog_sync_method},
{NULL, 0, NULL, NULL, NULL, NULL}
};
/******** end of options list ********/
@ -723,7 +723,10 @@ set_config_option(const char * name, const char * value, GucContext
elog(elevel, "out of memory");
return false;
}
free(*conf->variable);
if (conf->assign_hook)
(conf->assign_hook)(str);
if (*conf->variable)
free(*conf->variable);
*conf->variable = str;
}
}
@ -737,7 +740,10 @@ set_config_option(const char * name, const char * value, GucContext
elog(elevel, "out of memory");
return false;
}
free(*conf->variable);
if (conf->assign_hook)
(conf->assign_hook)(str);
if (*conf->variable)
free(*conf->variable);
*conf->variable = str;
}
break;
@ -855,7 +861,7 @@ ParseLongOption(const char * string, char ** name, char ** value)
#ifdef ENABLE_SYSLOG
bool
static bool
check_facility(const char *facility)
{
if (strcasecmp(facility,"LOCAL0") == 0) return true;