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Commitf6e603c

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Add new -x XID option to /contrib/pg_resetxlog for future pg_upgrade use.
1 parent7955f98 commitf6e603c

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2 files changed

+65
-29
lines changed

2 files changed

+65
-29
lines changed

‎contrib/pg_resetxlog/README.pg_resetxlog

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -21,6 +21,9 @@ module pg_controldata and run it to be sure the DB state is SHUTDOWN).
2121
Then run pg_resetxlog, and finally install and start the new version of
2222
the database software.
2323

24+
A tertiary purpose it its use by pg_upgrade to set the next transaction
25+
id in pg_control.
26+
2427
To run the program, make sure your postmaster is not running, then
2528
(as the Postgres admin user) do
2629

‎contrib/pg_resetxlog/pg_resetxlog.c

Lines changed: 62 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -23,7 +23,7 @@
2323
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
2424
* Portions Copyright (c) 1994, Regents of the University of California
2525
*
26-
* $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.10 2001/11/05 17:46:23 momjian Exp $
26+
* $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.11 2002/01/10 17:51:52 momjian Exp $
2727
*
2828
*-------------------------------------------------------------------------
2929
*/
@@ -709,34 +709,39 @@ PrintControlValues(void)
709709
* Write out the new pg_control file.
710710
*/
711711
staticvoid
712-
RewriteControlFile(void)
712+
RewriteControlFile(TransactionIdset_xid)
713713
{
714714
intfd;
715715
charbuffer[BLCKSZ];/* need not be aligned */
716716

717-
/*
718-
* Adjust fields as needed to force an empty XLOG starting at the next
719-
* available segment.
720-
*/
721-
newXlogId=ControlFile.logId;
722-
newXlogSeg=ControlFile.logSeg;
723-
/* be sure we wrap around correctly at end of a logfile */
724-
NextLogSeg(newXlogId,newXlogSeg);
725-
726-
ControlFile.checkPointCopy.redo.xlogid=newXlogId;
727-
ControlFile.checkPointCopy.redo.xrecoff=
728-
newXlogSeg*XLogSegSize+SizeOfXLogPHD;
729-
ControlFile.checkPointCopy.undo=ControlFile.checkPointCopy.redo;
730-
ControlFile.checkPointCopy.time=time(NULL);
731-
732-
ControlFile.state=DB_SHUTDOWNED;
733-
ControlFile.time=time(NULL);
734-
ControlFile.logId=newXlogId;
735-
ControlFile.logSeg=newXlogSeg+1;
736-
ControlFile.checkPoint=ControlFile.checkPointCopy.redo;
737-
ControlFile.prevCheckPoint.xlogid=0;
738-
ControlFile.prevCheckPoint.xrecoff=0;
739-
717+
if (set_xid==0)
718+
{
719+
/*
720+
* Adjust fields as needed to force an empty XLOG starting at the next
721+
* available segment.
722+
*/
723+
newXlogId=ControlFile.logId;
724+
newXlogSeg=ControlFile.logSeg;
725+
/* be sure we wrap around correctly at end of a logfile */
726+
NextLogSeg(newXlogId,newXlogSeg);
727+
728+
ControlFile.checkPointCopy.redo.xlogid=newXlogId;
729+
ControlFile.checkPointCopy.redo.xrecoff=
730+
newXlogSeg*XLogSegSize+SizeOfXLogPHD;
731+
ControlFile.checkPointCopy.undo=ControlFile.checkPointCopy.redo;
732+
ControlFile.checkPointCopy.time=time(NULL);
733+
734+
ControlFile.state=DB_SHUTDOWNED;
735+
ControlFile.time=time(NULL);
736+
ControlFile.logId=newXlogId;
737+
ControlFile.logSeg=newXlogSeg+1;
738+
ControlFile.checkPoint=ControlFile.checkPointCopy.redo;
739+
ControlFile.prevCheckPoint.xlogid=0;
740+
ControlFile.prevCheckPoint.xrecoff=0;
741+
}
742+
else
743+
ControlFile.checkPointCopy.nextXid=set_xid;
744+
740745
/* Contents are protected with a CRC */
741746
INIT_CRC64(ControlFile.crc);
742747
COMP_CRC64(ControlFile.crc,
@@ -926,9 +931,10 @@ WriteEmptyXLOG(void)
926931
staticvoid
927932
usage(void)
928933
{
929-
fprintf(stderr,"Usage: pg_resetxlog [-f] [-n] PGDataDirectory\n\n"
930-
" -f\tforce update to be done\n"
931-
" -n\tno update, just show extracted pg_control values (for testing)\n");
934+
fprintf(stderr,"Usage: pg_resetxlog [-f] [-n] [-x xid] PGDataDirectory\n"
935+
" -f\tforce update to be done\n"
936+
" -n\tno update, just show extracted pg_control values (for testing)\n"
937+
" -x XID\tset XID in pg_control\n");
932938
exit(1);
933939
}
934940

@@ -939,6 +945,7 @@ main(int argc, char **argv)
939945
intargn;
940946
boolforce= false;
941947
boolnoupdate= false;
948+
TransactionIdset_xid=0;
942949
intfd;
943950
charpath[MAXPGPATH];
944951

@@ -950,6 +957,18 @@ main(int argc, char **argv)
950957
force= true;
951958
elseif (strcmp(argv[argn],"-n")==0)
952959
noupdate= true;
960+
elseif (strcmp(argv[argn],"-x")==0)
961+
{
962+
argn++;
963+
if (argn==argc)
964+
usage();
965+
set_xid=strtoul(argv[argn],NULL,0);
966+
if (set_xid==0)
967+
{
968+
fprintf(stderr,"XID can not be 0.");
969+
exit(1);
970+
}
971+
}
953972
else
954973
usage();
955974
}
@@ -992,6 +1011,20 @@ main(int argc, char **argv)
9921011
if (!ReadControlFile())
9931012
GuessControlValues();
9941013

1014+
/*
1015+
* Set XID in pg_control and exit
1016+
*/
1017+
if (set_xid)
1018+
{
1019+
if (guessed)
1020+
{
1021+
printf("\npg_control appears corrupt. Can not update XID.\n");
1022+
exit(1);
1023+
}
1024+
RewriteControlFile(set_xid);
1025+
exit(0);
1026+
}
1027+
9951028
/*
9961029
* If we had to guess anything, and -f was not given, just print the
9971030
* guessed values and exit. Also print if -n is given.
@@ -1018,7 +1051,7 @@ main(int argc, char **argv)
10181051
/*
10191052
* Else, do the dirty deed.
10201053
*/
1021-
RewriteControlFile();
1054+
RewriteControlFile(0);
10221055
KillExistingXLOG();
10231056
WriteEmptyXLOG();
10241057

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