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Code review for latest changes.

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This commit is contained in:
Tom Lane 2002-01-11 21:27:13 +00:00
parent c6fdf8bcfc
commit 5c2d36c3dd
2 changed files with 29 additions and 34 deletions
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2
contrib/pg_resetxlog/README.pg_resetxlog
View File

@ -21,7 +21,7 @@ module pg_controldata and run it to be sure the DB state is SHUTDOWN).
Then run pg_resetxlog, and finally install and start the new version of
the database software.
A tertiary purpose it its use by pg_upgrade to set the next transaction
A tertiary purpose is its use by pg_upgrade to set the next transaction
id and checkpoint location in pg_control.
To run the program, make sure your postmaster is not running, then

61
contrib/pg_resetxlog/pg_resetxlog.c
View File

@ -23,7 +23,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.16 2002/01/11 06:33:01 momjian Exp $
* $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.17 2002/01/11 21:27:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,7 +63,6 @@
snprintf(path, MAXPGPATH, "%s/%08X%08X", \
XLogDir, log, seg)
/******************** end of stuff copied from xlog.c ********************/
@ -134,7 +133,7 @@ ReadControlFile(void)
return true;
}
fprintf(stderr, "pg_control exists but has invalid CRC; proceeding with caution.\n");
fprintf(stderr, "pg_control exists but has invalid CRC; proceed with caution.\n");
/* We will use the data anyway, but treat it as guessed. */
memcpy(&ControlFile, buffer, sizeof(ControlFile));
guessed = true;
@ -218,12 +217,11 @@ GuessControlValues(void)
static void
PrintControlValues(bool guessed)
{
printf("\n%spg_control values:\n\n"
printf("%spg_control values:\n\n"
"pg_control version number: %u\n"
"Catalog version number: %u\n"
"Current log file id: %u\n"
"Next log file segment: %u\n"
"Latest checkpoint location: %X/%X\n"
"Latest checkpoint's StartUpID: %u\n"
"Latest checkpoint's NextXID: %u\n"
"Latest checkpoint's NextOID: %u\n"
@ -237,8 +235,6 @@ PrintControlValues(bool guessed)
ControlFile.catalog_version_no,
ControlFile.logId,
ControlFile.logSeg,
ControlFile.checkPoint.xlogid,
ControlFile.checkPoint.xrecoff,
ControlFile.checkPointCopy.ThisStartUpID,
ControlFile.checkPointCopy.nextXid,
ControlFile.checkPointCopy.nextOid,
@ -253,7 +249,7 @@ PrintControlValues(bool guessed)
* Write out the new pg_control file.
*/
static void
RewriteControlFile(TransactionId set_xid, XLogRecPtr set_checkpoint)
RewriteControlFile(void)
{
int fd;
char buffer[BLCKSZ]; /* need not be aligned */
@ -277,18 +273,10 @@ RewriteControlFile(TransactionId set_xid, XLogRecPtr set_checkpoint)
ControlFile.time = time(NULL);
ControlFile.logId = newXlogId;
ControlFile.logSeg = newXlogSeg + 1;
ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
ControlFile.prevCheckPoint.xlogid = 0;
ControlFile.prevCheckPoint.xrecoff = 0;
if (set_xid != 0)
ControlFile.checkPointCopy.nextXid = set_xid;
if (set_checkpoint.xlogid == 0 &&
set_checkpoint.xrecoff == 0)
ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
else
ControlFile.checkPoint = set_checkpoint;
/* Contents are protected with a CRC */
INIT_CRC64(ControlFile.crc);
COMP_CRC64(ControlFile.crc,
@ -478,11 +466,11 @@ WriteEmptyXLOG(void)
static void
usage(void)
{
fprintf(stderr, "Usage: pg_resetxlog [-f] [-n] [-x xid] [ -l log_id offset ] PGDataDirectory\n"
" -f\t force update to be done\n"
" -n\t no update, just show extracted pg_control values (for testing)\n"
" -x XID set XID in pg_control\n"
" -l log_id offset set hex checkpoint location in pg_control\n");
fprintf(stderr, "Usage: pg_resetxlog [-f] [-n] [-x xid] [ -l fileid seg ] PGDataDirectory\n"
" -f\t\tforce update to be done\n"
" -n\t\tno update, just show extracted pg_control values (for testing)\n"
" -x xid\tset next transaction ID\n"
" -l fileid seg\tforce minimum WAL starting location for new xlog\n");
exit(1);
}
@ -494,7 +482,8 @@ main(int argc, char **argv)
bool force = false;
bool noupdate = false;
TransactionId set_xid = 0;
XLogRecPtr set_checkpoint = {0,0};
uint32 minXlogId = 0,
minXlogSeg = 0;
int fd;
char path[MAXPGPATH];
@ -514,7 +503,7 @@ main(int argc, char **argv)
set_xid = strtoul(argv[argn], NULL, 0);
if (set_xid == 0)
{
fprintf(stderr, "XID can not be 0.");
fprintf(stderr, "XID can not be 0.\n");
exit(1);
}
}
@ -523,17 +512,11 @@ main(int argc, char **argv)
argn++;
if (argn == argc)
usage();
set_checkpoint.xlogid = strtoul(argv[argn], NULL, 16);
minXlogId = strtoul(argv[argn], NULL, 0);
argn++;
if (argn == argc)
usage();
set_checkpoint.xrecoff = strtoul(argv[argn], NULL, 16);
if (set_checkpoint.xlogid == 0 &&
set_checkpoint.xrecoff == 0)
{
fprintf(stderr, "Checkpoint can not be '0 0'.");
exit(1);
}
minXlogSeg = strtoul(argv[argn], NULL, 0);
}
else
usage();
@ -606,8 +589,20 @@ main(int argc, char **argv)
/*
* Else, do the dirty deed.
*
* First adjust fields if required by switches.
*/
RewriteControlFile(set_xid, set_checkpoint);
if (set_xid != 0)
ControlFile.checkPointCopy.nextXid = set_xid;
if (minXlogId > ControlFile.logId ||
(minXlogId == ControlFile.logId && minXlogSeg > ControlFile.logSeg))
{
ControlFile.logId = minXlogId;
ControlFile.logSeg = minXlogSeg;
}
RewriteControlFile();
KillExistingXLOG();
WriteEmptyXLOG();