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Fix statistics breakage from bgwriter/checkpointer process split.

ForwardFsyncRequest() supposed that it could only be called in regularbackends, which used to be true; but since the splitup of bgwriter andcheckpointer, it is also called in the bgwriter. We do not want to countsuch calls in pg_stat_bgwriter.buffers_backend statistics, so fix thingsso that they aren't.(It's worth noting here that this implies an alarmingly large increase inthe expected amount of cross-process fsync request traffic, which may wellmean that the process splitup was not such a hot idea.)

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src/backend/postmaster
- checkpointer.c

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`‎src/backend/postmaster/checkpointer.c`

Lines changed: 4 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1132,7 +1132,8 @@ ForwardFsyncRequest(RelFileNode rnode, ForkNumber forknum, BlockNumber segno)`
`1132`	`1132`	`LWLockAcquire(CheckpointerCommLock,LW_EXCLUSIVE);`
`1133`	`1133`
`1134`	`1134`	`/* Count all backend writes regardless of if they fit in the queue */`
`1135`		`-CheckpointerShmem->num_backend_writes++;`
	`1135`	`+if (!AmBackgroundWriterProcess())`
	`1136`	`+CheckpointerShmem->num_backend_writes++;`
`1136`	`1137`
`1137`	`1138`	`/*`
`1138`	`1139`	`* If the checkpointer isn't running or the request queue is full, the`
`@@ -1147,7 +1148,8 @@ ForwardFsyncRequest(RelFileNode rnode, ForkNumber forknum, BlockNumber segno)`
`1147`	`1148`	`* Count the subset of writes where backends have to do their own`
`1148`	`1149`	`* fsync`
`1149`	`1150`	`*/`
`1150`		`-CheckpointerShmem->num_backend_fsync++;`
	`1151`	`+if (!AmBackgroundWriterProcess())`
	`1152`	`+CheckpointerShmem->num_backend_fsync++;`
`1151`	`1153`	`LWLockRelease(CheckpointerCommLock);`
`1152`	`1154`	`return false;`
`1153`	`1155`	`}`

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Commit80e373c

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`‎src/backend/postmaster/checkpointer.c`

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