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Use PGAlignedXLogBlock for some code simplification

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The code in BootStrapXLOG() and in pg_test_fsync.c tried to align WAL
buffers in complicated ways.  Also, they still used XLOG_BLCKSZ for
the alignment, even though that should now be PG_IO_ALIGN_SIZE.  This
can now be simplified and made more consistent by using
PGAlignedXLogBlock, either directly in BootStrapXLOG() and using
alignas in pg_test_fsync.c.

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f462a175-b608-44a1-b428-bdf351e914f4%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-12-08 13:52:42 +01:00
parent 31280d96a6
commit 804046b39a
2 changed files with 8 additions and 15 deletions
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12
src/backend/access/transam/xlog.c
View File

@@ -5089,7 +5089,7 @@ void
BootStrapXLOG(uint32 data_checksum_version)
{
CheckPoint checkPoint;
char *buffer;
PGAlignedXLogBlock buffer;
XLogPageHeader page;
XLogLongPageHeader longpage;
XLogRecord *record;
@@ -5118,10 +5118,8 @@ BootStrapXLOG(uint32 data_checksum_version)
sysidentifier |= ((uint64) tv.tv_usec) << 12;
sysidentifier |= getpid() & 0xFFF;
/* page buffer must be aligned suitably for O_DIRECT */
buffer = (char *) palloc(XLOG_BLCKSZ + XLOG_BLCKSZ);
page = (XLogPageHeader) TYPEALIGN(XLOG_BLCKSZ, buffer);
memset(page, 0, XLOG_BLCKSZ);
memset(&buffer, 0, sizeof buffer);
page = (XLogPageHeader) &buffer;
/*
* Set up information for the initial checkpoint record
@@ -5202,7 +5200,7 @@ BootStrapXLOG(uint32 data_checksum_version)
/* Write the first page with the initial record */
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_WAL_BOOTSTRAP_WRITE);
if (write(openLogFile, page, XLOG_BLCKSZ) != XLOG_BLCKSZ)
if (write(openLogFile, &buffer, XLOG_BLCKSZ) != XLOG_BLCKSZ)
{
/* if write didn't set errno, assume problem is no disk space */
if (errno == 0)
@@ -5242,8 +5240,6 @@ BootStrapXLOG(uint32 data_checksum_version)
BootStrapSUBTRANS();
BootStrapMultiXact();
pfree(buffer);
/*
* Force control file to be read - in contrast to normal processing we'd
* otherwise never run the checks and GUC related initializations therein.

11
src/bin/pg_test_fsync/pg_test_fsync.c
View File

@@ -68,9 +68,8 @@ static const char *progname;
static unsigned int secs_per_test = 5;
static int needs_unlink = 0;
static char full_buf[DEFAULT_XLOG_SEG_SIZE],
*buf,
*filename = FSYNC_FILENAME;
alignas(PGAlignedXLogBlock) static char buf[DEFAULT_XLOG_SEG_SIZE];
static char *filename = FSYNC_FILENAME;
static struct timeval start_t,
stop_t;
static sig_atomic_t alarm_triggered = false;
@@ -232,9 +231,7 @@ prepare_buf(void)
/* write random data into buffer */
for (ops = 0; ops < DEFAULT_XLOG_SEG_SIZE; ops++)
full_buf[ops] = (char) pg_prng_int32(&pg_global_prng_state);
buf = (char *) TYPEALIGN(XLOG_BLCKSZ, full_buf);
buf[ops] = (char) pg_prng_int32(&pg_global_prng_state);
}
static void
@@ -248,7 +245,7 @@ test_open(void)
if ((tmpfile = open(filename, O_RDWR | O_CREAT | PG_BINARY, S_IRUSR | S_IWUSR)) == -1)
die("could not open output file");
needs_unlink = 1;
if (write(tmpfile, full_buf, DEFAULT_XLOG_SEG_SIZE) !=
if (write(tmpfile, buf, DEFAULT_XLOG_SEG_SIZE) !=
DEFAULT_XLOG_SEG_SIZE)
die("write failed");