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path: root/src/backend/access/transam/xlogreader.c
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Diffstat (limited to 'src/backend/access/transam/xlogreader.c')
-rw-r--r--src/backend/access/transam/xlogreader.c73
1 files changed, 46 insertions, 27 deletions
diff --git a/src/backend/access/transam/xlogreader.c b/src/backend/access/transam/xlogreader.c
index a66e3324b11..27c27303d6c 100644
--- a/src/backend/access/transam/xlogreader.c
+++ b/src/backend/access/transam/xlogreader.c
@@ -68,8 +68,8 @@ report_invalid_record(XLogReaderState *state, const char *fmt,...)
* Returns NULL if the xlogreader couldn't be allocated.
*/
XLogReaderState *
-XLogReaderAllocate(int wal_segment_size, XLogPageReadCB pagereadfunc,
- void *private_data)
+XLogReaderAllocate(int wal_segment_size, const char *waldir,
+ XLogPageReadCB pagereadfunc, void *private_data)
{
XLogReaderState *state;
@@ -96,7 +96,10 @@ XLogReaderAllocate(int wal_segment_size, XLogPageReadCB pagereadfunc,
return NULL;
}
- state->wal_segment_size = wal_segment_size;
+ /* Initialize segment info. */
+ WALOpenSegmentInit(&state->seg, &state->segcxt, wal_segment_size,
+ waldir);
+
state->read_page = pagereadfunc;
/* system_identifier initialized to zeroes above */
state->private_data = private_data;
@@ -199,6 +202,23 @@ allocate_recordbuf(XLogReaderState *state, uint32 reclength)
}
/*
+ * Initialize the passed segment structs.
+ */
+void
+WALOpenSegmentInit(WALOpenSegment *seg, WALSegmentContext *segcxt,
+ int segsize, const char *waldir)
+{
+ seg->ws_file = -1;
+ seg->ws_segno = 0;
+ seg->ws_off = 0;
+ seg->ws_tli = 0;
+
+ segcxt->ws_segsize = segsize;
+ if (waldir)
+ snprintf(segcxt->ws_dir, MAXPGPATH, "%s", waldir);
+}
+
+/*
* Attempt to read an XLOG record.
*
* If RecPtr is valid, try to read a record at that position. Otherwise
@@ -490,8 +510,8 @@ XLogReadRecord(XLogReaderState *state, XLogRecPtr RecPtr, char **errormsg)
(record->xl_info & ~XLR_INFO_MASK) == XLOG_SWITCH)
{
/* Pretend it extends to end of segment */
- state->EndRecPtr += state->wal_segment_size - 1;
- state->EndRecPtr -= XLogSegmentOffset(state->EndRecPtr, state->wal_segment_size);
+ state->EndRecPtr += state->segcxt.ws_segsize - 1;
+ state->EndRecPtr -= XLogSegmentOffset(state->EndRecPtr, state->segcxt.ws_segsize);
}
if (DecodeXLogRecord(state, record, errormsg))
@@ -533,12 +553,12 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
Assert((pageptr % XLOG_BLCKSZ) == 0);
- XLByteToSeg(pageptr, targetSegNo, state->wal_segment_size);
- targetPageOff = XLogSegmentOffset(pageptr, state->wal_segment_size);
+ XLByteToSeg(pageptr, targetSegNo, state->segcxt.ws_segsize);
+ targetPageOff = XLogSegmentOffset(pageptr, state->segcxt.ws_segsize);
/* check whether we have all the requested data already */
- if (targetSegNo == state->readSegNo && targetPageOff == state->readOff &&
- reqLen <= state->readLen)
+ if (targetSegNo == state->seg.ws_segno &&
+ targetPageOff == state->seg.ws_off && reqLen <= state->readLen)
return state->readLen;
/*
@@ -553,13 +573,13 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
* record is. This is so that we can check the additional identification
* info that is present in the first page's "long" header.
*/
- if (targetSegNo != state->readSegNo && targetPageOff != 0)
+ if (targetSegNo != state->seg.ws_segno && targetPageOff != 0)
{
XLogRecPtr targetSegmentPtr = pageptr - targetPageOff;
readLen = state->read_page(state, targetSegmentPtr, XLOG_BLCKSZ,
state->currRecPtr,
- state->readBuf, &state->readPageTLI);
+ state->readBuf);
if (readLen < 0)
goto err;
@@ -577,7 +597,7 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
*/
readLen = state->read_page(state, pageptr, Max(reqLen, SizeOfXLogShortPHD),
state->currRecPtr,
- state->readBuf, &state->readPageTLI);
+ state->readBuf);
if (readLen < 0)
goto err;
@@ -596,7 +616,7 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
{
readLen = state->read_page(state, pageptr, XLogPageHeaderSize(hdr),
state->currRecPtr,
- state->readBuf, &state->readPageTLI);
+ state->readBuf);
if (readLen < 0)
goto err;
}
@@ -608,8 +628,8 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
goto err;
/* update read state information */
- state->readSegNo = targetSegNo;
- state->readOff = targetPageOff;
+ state->seg.ws_segno = targetSegNo;
+ state->seg.ws_off = targetPageOff;
state->readLen = readLen;
return readLen;
@@ -625,8 +645,8 @@ err:
static void
XLogReaderInvalReadState(XLogReaderState *state)
{
- state->readSegNo = 0;
- state->readOff = 0;
+ state->seg.ws_segno = 0;
+ state->seg.ws_off = 0;
state->readLen = 0;
}
@@ -745,16 +765,16 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
Assert((recptr % XLOG_BLCKSZ) == 0);
- XLByteToSeg(recptr, segno, state->wal_segment_size);
- offset = XLogSegmentOffset(recptr, state->wal_segment_size);
+ XLByteToSeg(recptr, segno, state->segcxt.ws_segsize);
+ offset = XLogSegmentOffset(recptr, state->segcxt.ws_segsize);
- XLogSegNoOffsetToRecPtr(segno, offset, state->wal_segment_size, recaddr);
+ XLogSegNoOffsetToRecPtr(segno, offset, state->segcxt.ws_segsize, recaddr);
if (hdr->xlp_magic != XLOG_PAGE_MAGIC)
{
char fname[MAXFNAMELEN];
- XLogFileName(fname, state->readPageTLI, segno, state->wal_segment_size);
+ XLogFileName(fname, state->seg.ws_tli, segno, state->segcxt.ws_segsize);
report_invalid_record(state,
"invalid magic number %04X in log segment %s, offset %u",
@@ -768,7 +788,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
{
char fname[MAXFNAMELEN];
- XLogFileName(fname, state->readPageTLI, segno, state->wal_segment_size);
+ XLogFileName(fname, state->seg.ws_tli, segno, state->segcxt.ws_segsize);
report_invalid_record(state,
"invalid info bits %04X in log segment %s, offset %u",
@@ -791,7 +811,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
(unsigned long long) state->system_identifier);
return false;
}
- else if (longhdr->xlp_seg_size != state->wal_segment_size)
+ else if (longhdr->xlp_seg_size != state->segcxt.ws_segsize)
{
report_invalid_record(state,
"WAL file is from different database system: incorrect segment size in page header");
@@ -808,7 +828,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
{
char fname[MAXFNAMELEN];
- XLogFileName(fname, state->readPageTLI, segno, state->wal_segment_size);
+ XLogFileName(fname, state->seg.ws_tli, segno, state->segcxt.ws_segsize);
/* hmm, first page of file doesn't have a long header? */
report_invalid_record(state,
@@ -828,7 +848,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
{
char fname[MAXFNAMELEN];
- XLogFileName(fname, state->readPageTLI, segno, state->wal_segment_size);
+ XLogFileName(fname, state->seg.ws_tli, segno, state->segcxt.ws_segsize);
report_invalid_record(state,
"unexpected pageaddr %X/%X in log segment %s, offset %u",
@@ -853,7 +873,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
{
char fname[MAXFNAMELEN];
- XLogFileName(fname, state->readPageTLI, segno, state->wal_segment_size);
+ XLogFileName(fname, state->seg.ws_tli, segno, state->segcxt.ws_segsize);
report_invalid_record(state,
"out-of-sequence timeline ID %u (after %u) in log segment %s, offset %u",
@@ -997,7 +1017,6 @@ out:
#endif /* FRONTEND */
-
/* ----------------------------------------
* Functions for decoding the data and block references in a record.
* ----------------------------------------
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-01 22:31:24 +0000