aio: Change prefix of PgAioResultStatus values to PGAIO_RS_

The previous prefix wasn't consistent with the naming of other AIO related
enum values. It seems best to rename it before the users are introduced.

Reported-by: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/CAAKRu_Yb+JzQpNsgUxCB0gBi+sE-mi_HmcJF6ALnmO4W+UgwpA@mail.gmail.com

src/backend/storage/aio/aio.c

@@ -216,7 +216,7 @@ pgaio_io_acquire_nb(struct ResourceOwnerData *resowner, PgAioReturn *ret)
 		if (ret)
 		{
 			ioh->report_return = ret;
-			ret->result.status = ARS_UNKNOWN;
+			ret->result.status = PGAIO_RS_UNKNOWN;
 		}
 
 		return ioh;
@@ -669,7 +669,7 @@ pgaio_io_reclaim(PgAioHandle *ioh)
 	ioh->handle_data_len = 0;
 	ioh->report_return = NULL;
 	ioh->result = 0;
-	ioh->distilled_result.status = ARS_UNKNOWN;
+	ioh->distilled_result.status = PGAIO_RS_UNKNOWN;
 
 	/* XXX: the barrier is probably superfluous */
 	pg_write_barrier();
@@ -829,13 +829,13 @@ pgaio_result_status_string(PgAioResultStatus rs)
 {
 	switch (rs)
 	{
-		case ARS_UNKNOWN:
+		case PGAIO_RS_UNKNOWN:
 			return "UNKNOWN";
-		case ARS_OK:
+		case PGAIO_RS_OK:
 			return "OK";
-		case ARS_PARTIAL:
+		case PGAIO_RS_PARTIAL:
 			return "PARTIAL";
-		case ARS_ERROR:
+		case PGAIO_RS_ERROR:
 			return "ERROR";
 	}
 

src/backend/storage/aio/aio_callback.c

@@ -164,8 +164,8 @@ pgaio_result_report(PgAioResult result, const PgAioTargetData *target_data, int
 	PgAioHandleCallbackID cb_id = result.id;
 	const PgAioHandleCallbacksEntry *ce = &aio_handle_cbs[cb_id];
 
-	Assert(result.status != ARS_UNKNOWN);
+	Assert(result.status != PGAIO_RS_UNKNOWN);
-	Assert(result.status != ARS_OK);
+	Assert(result.status != PGAIO_RS_OK);
 
 	if (ce->cb->report == NULL)
 		elog(ERROR, "callback %d/%s does not have report callback",
@@ -220,7 +220,7 @@ pgaio_io_call_complete_shared(PgAioHandle *ioh)
 	Assert(ioh->target > PGAIO_TID_INVALID && ioh->target < PGAIO_TID_COUNT);
 	Assert(ioh->op > PGAIO_OP_INVALID && ioh->op < PGAIO_OP_COUNT);
 
-	result.status = ARS_OK;		/* low level IO is always considered OK */
+	result.status = PGAIO_RS_OK;	/* low level IO is always considered OK */
 	result.result = ioh->result;
 	result.id = PGAIO_HCB_INVALID;
 	result.error_data = 0;

src/backend/storage/aio/aio_init.c

@@ -202,7 +202,7 @@ AioShmemInit(void)
 			ioh->report_return = NULL;
 			ioh->resowner = NULL;
 			ioh->num_callbacks = 0;
-			ioh->distilled_result.status = ARS_UNKNOWN;
+			ioh->distilled_result.status = PGAIO_RS_UNKNOWN;
 			ioh->flags = 0;
 
 			ConditionVariableInit(&ioh->cv);

src/include/storage/aio_types.h

@@ -73,10 +73,10 @@ typedef union PgAioTargetData
  */
 typedef enum PgAioResultStatus
 {
-	ARS_UNKNOWN,				/* not yet completed / uninitialized */
+	PGAIO_RS_UNKNOWN,			/* not yet completed / uninitialized */
-	ARS_OK,
+	PGAIO_RS_OK,
-	ARS_PARTIAL,				/* did not fully succeed, but no error */
+	PGAIO_RS_PARTIAL,			/* did not fully succeed, but no error */
-	ARS_ERROR,
+	PGAIO_RS_ERROR,
 } PgAioResultStatus;