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/*-------------------------------------------------------------------------
*
* aio.c
* AIO - Core Logic
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/storage/aio/aio.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "lib/ilist.h"
#include "storage/aio.h"
#include "storage/aio_subsys.h"
#include "utils/guc.h"
#include "utils/guc_hooks.h"
/* Options for io_method. */
const struct config_enum_entry io_method_options[] = {
{"sync", IOMETHOD_SYNC, false},
{NULL, 0, false}
};
/* GUCs */
int io_method = DEFAULT_IO_METHOD;
int io_max_concurrency = -1;
/*
* Release IO handle during resource owner cleanup.
*/
void
pgaio_io_release_resowner(dlist_node *ioh_node, bool on_error)
{
}
/*
* Perform AIO related cleanup after an error.
*
* This should be called early in the error recovery paths, as later steps may
* need to issue AIO (e.g. to record a transaction abort WAL record).
*/
void
pgaio_error_cleanup(void)
{
}
/*
* Perform AIO related checks at (sub-)transactional boundaries.
*
* This should be called late during (sub-)transactional commit/abort, after
* all steps that might need to perform AIO, so that we can verify that the
* AIO subsystem is in a valid state at the end of a transaction.
*/
void
AtEOXact_Aio(bool is_commit)
{
}
void
assign_io_method(int newval, void *extra)
{
}
bool
check_io_max_concurrency(int *newval, void **extra, GucSource source)
{
if (*newval == -1)
{
/*
* Auto-tuning will be applied later during startup, as auto-tuning
* depends on the value of various GUCs.
*/
return true;
}
else if (*newval == 0)
{
GUC_check_errdetail("Only -1 or values bigger than 0 are valid.");
return false;
}
return true;
}
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