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Use correctly-sized buffer when zero-filling a WAL file.

I mixed up BLCKSZ and XLOG_BLCKSZ when I changed the way the buffer isallocated a couple of weeks ago. With the default settings, they are both8k, but they can be changed at compile-time.

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src/backend/access/transam
- xlog.c

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`‎src/backend/access/transam/xlog.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -2348,7 +2348,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2348`	`2348`	`{`
`2349`	`2349`	`charpath[MAXPGPATH];`
`2350`	`2350`	`chartmppath[MAXPGPATH];`
`2351`		`-charzbuffer_raw[BLCKSZ+MAXIMUM_ALIGNOF];`
	`2351`	`+charzbuffer_raw[XLOG_BLCKSZ+MAXIMUM_ALIGNOF];`
`2352`	`2352`	`char*zbuffer;`
`2353`	`2353`	`uint32installed_log;`
`2354`	`2354`	`uint32installed_seg;`
`@@ -2410,7 +2410,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2410`	`2410`	`* cycles transferring data to the kernel.`
`2411`	`2411`	`*/`
`2412`	`2412`	`zbuffer= (char*)MAXALIGN(zbuffer_raw);`
`2413`		`-memset(zbuffer,0,BLCKSZ);`
	`2413`	`+memset(zbuffer,0,XLOG_BLCKSZ);`
`2414`	`2414`	`for (nbytes=0;nbytes<XLogSegSize;nbytes+=XLOG_BLCKSZ)`
`2415`	`2415`	`{`
`2416`	`2416`	`errno=0;`

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Commit61df3d0

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`‎src/backend/access/transam/xlog.c`

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