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Commite6140d9

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committed
Don't use BLCKSZ for the physical length of the pg_control file, but
instead a dedicated symbol. This probably makes no functional differencefor likely values of BLCKSZ, but it makes the intent clearer.Simon Riggs, minor editorialization by Tom Lane.
1 parent147d4bf commite6140d9

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3 files changed

+34
-26
lines changed

3 files changed

+34
-26
lines changed

‎src/backend/access/transam/xlog.c

Lines changed: 11 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.232 2006/04/03 23:35:03 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.233 2006/04/04 22:39:59 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -3391,7 +3391,7 @@ static void
33913391
WriteControlFile(void)
33923392
{
33933393
intfd;
3394-
charbuffer[BLCKSZ];/* need not be aligned */
3394+
charbuffer[PG_CONTROL_SIZE];/* need not be aligned */
33953395
char*localeptr;
33963396

33973397
/*
@@ -3437,17 +3437,16 @@ WriteControlFile(void)
34373437
FIN_CRC32(ControlFile->crc);
34383438

34393439
/*
3440-
* We write outBLCKSZ bytes into pg_control, zero-padding the excess over
3441-
* sizeof(ControlFileData). This reduces the odds of premature-EOF errors
3442-
* when reading pg_control. We'll still fail when we check the contents
3443-
* of the file, but hopefully with a more specific error than "couldn't
3444-
* read pg_control".
3440+
* We write outPG_CONTROL_SIZE bytes into pg_control, zero-padding the
3441+
*excess oversizeof(ControlFileData). This reduces the odds of
3442+
*premature-EOF errorswhen reading pg_control. We'll still fail when we
3443+
*check the contentsof the file, but hopefully with a more specific
3444+
*error than "couldn'tread pg_control".
34453445
*/
3446-
if (sizeof(ControlFileData)>BLCKSZ)
3447-
ereport(PANIC,
3448-
(errmsg("sizeof(ControlFileData) is larger than BLCKSZ; fix either one")));
3446+
if (sizeof(ControlFileData)>PG_CONTROL_SIZE)
3447+
elog(PANIC,"sizeof(ControlFileData) is larger than PG_CONTROL_SIZE; fix either one");
34493448

3450-
memset(buffer,0,BLCKSZ);
3449+
memset(buffer,0,PG_CONTROL_SIZE);
34513450
memcpy(buffer,ControlFile,sizeof(ControlFileData));
34523451

34533452
fd=BasicOpenFile(XLOG_CONTROL_FILE,
@@ -3460,7 +3459,7 @@ WriteControlFile(void)
34603459
XLOG_CONTROL_FILE)));
34613460

34623461
errno=0;
3463-
if (write(fd,buffer,BLCKSZ)!=BLCKSZ)
3462+
if (write(fd,buffer,PG_CONTROL_SIZE)!=PG_CONTROL_SIZE)
34643463
{
34653464
/* if write didn't set errno, assume problem is no disk space */
34663465
if (errno==0)

‎src/bin/pg_resetxlog/pg_resetxlog.c

Lines changed: 13 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -23,7 +23,7 @@
2323
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
2424
* Portions Copyright (c) 1994, Regents of the University of California
2525
*
26-
* $PostgreSQL: pgsql/src/bin/pg_resetxlog/pg_resetxlog.c,v 1.41 2006/04/03 23:35:04 tgl Exp $
26+
* $PostgreSQL: pgsql/src/bin/pg_resetxlog/pg_resetxlog.c,v 1.42 2006/04/04 22:39:59 tgl Exp $
2727
*
2828
*-------------------------------------------------------------------------
2929
*/
@@ -365,9 +365,9 @@ ReadControlFile(void)
365365
}
366366

367367
/* Use malloc to ensure we have a maxaligned buffer */
368-
buffer= (char*)malloc(BLCKSZ);
368+
buffer= (char*)malloc(PG_CONTROL_SIZE);
369369

370-
len=read(fd,buffer,BLCKSZ);
370+
len=read(fd,buffer,PG_CONTROL_SIZE);
371371
if (len<0)
372372
{
373373
fprintf(stderr,_("%s: could not read file \"%s\": %s\n"),
@@ -546,7 +546,7 @@ static void
546546
RewriteControlFile(void)
547547
{
548548
intfd;
549-
charbuffer[BLCKSZ];/* need not be aligned */
549+
charbuffer[PG_CONTROL_SIZE];/* need not be aligned */
550550

551551
/*
552552
* Adjust fields as needed to force an empty XLOG starting at the next
@@ -587,21 +587,21 @@ RewriteControlFile(void)
587587
FIN_CRC32(ControlFile.crc);
588588

589589
/*
590-
* We write outBLCKSZ bytes into pg_control, zero-padding the excess over
591-
* sizeof(ControlFileData). This reduces the odds of premature-EOF errors
592-
* when reading pg_control. We'll still fail when we check the contents
593-
* of the file, but hopefully with a more specific error than "couldn't
594-
* read pg_control".
590+
* We write outPG_CONTROL_SIZE bytes into pg_control, zero-padding the
591+
*excess oversizeof(ControlFileData). This reduces the odds of
592+
*premature-EOF errorswhen reading pg_control. We'll still fail when we
593+
*check the contentsof the file, but hopefully with a more specific
594+
*error than "couldn'tread pg_control".
595595
*/
596-
if (sizeof(ControlFileData)>BLCKSZ)
596+
if (sizeof(ControlFileData)>PG_CONTROL_SIZE)
597597
{
598598
fprintf(stderr,
599-
_("%s: internal error -- sizeof(ControlFileData) is too large ... fixxlog.c\n"),
599+
_("%s: internal error -- sizeof(ControlFileData) is too large ... fixPG_CONTROL_SIZE\n"),
600600
progname);
601601
exit(1);
602602
}
603603

604-
memset(buffer,0,BLCKSZ);
604+
memset(buffer,0,PG_CONTROL_SIZE);
605605
memcpy(buffer,&ControlFile,sizeof(ControlFileData));
606606

607607
unlink(XLOG_CONTROL_FILE);
@@ -617,7 +617,7 @@ RewriteControlFile(void)
617617
}
618618

619619
errno=0;
620-
if (write(fd,buffer,BLCKSZ)!=BLCKSZ)
620+
if (write(fd,buffer,PG_CONTROL_SIZE)!=PG_CONTROL_SIZE)
621621
{
622622
/* if write didn't set errno, assume problem is no disk space */
623623
if (errno==0)

‎src/include/catalog/pg_control.h

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
99
* Portions Copyright (c) 1994, Regents of the University of California
1010
*
11-
* $PostgreSQL: pgsql/src/include/catalog/pg_control.h,v 1.28 2006/04/03 23:35:05 tgl Exp $
11+
* $PostgreSQL: pgsql/src/include/catalog/pg_control.h,v 1.29 2006/04/04 22:39:59 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -147,4 +147,13 @@ typedef struct ControlFileData
147147
pg_crc32crc;
148148
}ControlFileData;
149149

150+
/*
151+
* Physical size of the pg_control file. Note that this is considerably
152+
* bigger than the actually used size (ie, sizeof(ControlFileData)).
153+
* The idea is to keep the physical size constant independent of format
154+
* changes, so that ReadControlFile will deliver a suitable wrong-version
155+
* message instead of a read error if it's looking at an incompatible file.
156+
*/
157+
#definePG_CONTROL_SIZE8192
158+
150159
#endif/* PG_CONTROL_H */

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