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Simplify some maths in xlogreader.c 

An LSN was calculated from a segment number, a segment size and a
position offset, matching exactly the LSN given by the caller of
XLogReaderValidatePageHeader().  This change removes the extra LSN
calculation, relying only on the LSN given by the function caller
instead.

Author: Bharath Rupireddy
Reviewed-by: Richard Guo, Álvaro Herrera, Kyotaro Horiguchi
Discussion: https://postgr.es/m/CALj2ACXuh4Ms9j9sxMYdtHEe=5sFcyrs-GAHyADu_A_G71kZTg@mail.gmail.com
This commit is contained in:
Michael Paquier 2022-10-12 09:59:36 +09:00
parent 94fd253d56
commit a1176c67c4
1 changed files with 1 additions and 4 deletions
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5
src/backend/access/transam/xlogreader.c
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@ -1210,7 +1210,6 @@ bool
XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
char *phdr)
{
XLogRecPtr recaddr;
XLogSegNo segno;
int32 offset;
XLogPageHeader hdr = (XLogPageHeader) phdr;
@ -1220,8 +1219,6 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
XLByteToSeg(recptr, segno, state->segcxt.ws_segsize);
offset = XLogSegmentOffset(recptr, state->segcxt.ws_segsize);
XLogSegNoOffsetToRecPtr(segno, offset, state->segcxt.ws_segsize, recaddr);
if (hdr->xlp_magic != XLOG_PAGE_MAGIC)
{
char fname[MAXFNAMELEN];
@ -1296,7 +1293,7 @@ XLogReaderValidatePageHeader(XLogReaderState *state, XLogRecPtr recptr,
* check typically fails when an old WAL segment is recycled, and hasn't
* yet been overwritten with new data yet.
*/
if (hdr->xlp_pageaddr != recaddr)
if (hdr->xlp_pageaddr != recptr)
{
char fname[MAXFNAMELEN];