// ODirectPlatform indicates if the platform supports O_DIRECT
const ODirectPlatform = false

// OpenBSD, Windows, and illumos do not support O_DIRECT.
// On Windows there is no documentation on disabling O_DIRECT.
// For these systems we do not attempt to build the 'directio' dependency since
// the O_DIRECT symbol may not be exposed resulting in a failed build.
//
//
// On illumos an explicit O_DIRECT flag is not necessary for two primary

delete_cleanup_interval         (duration)  set to change intervals when deleted objects are permanently deleted from ".trash" folder (default: '5m')
odirect                         (boolean)   set to enable or disable O_DIRECT for writes under special conditions. NOTE: do not disable O_DIRECT without prior testing (default: 'on')
root_access                     (boolean)   turn 'off' root credential access for all API calls including s3, admin operations (default: 'on')

			Optional:    true,
			Type:        "duration",
		},
		config.HelpKV{
			Key:         apiODirect,
			Description: "set to enable or disable O_DIRECT for writes under special conditions. NOTE: do not disable O_DIRECT without prior testing" + defaultHelpPostfix(apiODirect),
			Optional:    true,
			Type:        "boolean",
		},
		config.HelpKV{
			Key:         apiRootAccess,

	"errors"
	"os"
	"runtime"
	"syscall"
)

// No space left on device error
func isSysErrNoSpace(err error) bool {
	return errors.Is(err, syscall.ENOSPC)
}

// Invalid argument, unsupported flags such as O_DIRECT
func isSysErrInvalidArg(err error) bool {
	return errors.Is(err, syscall.EINVAL)
}

// Input/output error
func isSysErrIO(err error) bool {
	return errors.Is(err, syscall.EIO)
}

}

// checkODirectDiskSupport asks the disk to write some data
// with O_DIRECT support, return an error if any and return
// errUnsupportedDisk if there is no O_DIRECT support
func (s *xlStorage) checkODirectDiskSupport(fsType string) error {
	if !disk.ODirectPlatform {
		return errUnsupportedDisk
	}

	// We know XFS already supports O_DIRECT no need to check.
	if fsType == "XFS" {
		return nil
	}

// used with DIRECT I/O based file descriptor and it is expected that
// input writer *os.File not a generic io.Writer. Make sure to have
// the file opened for writes with syscall.O_DIRECT flag.
func CopyAligned(w io.Writer, r io.Reader, alignedBuf []byte, totalSize int64, file *os.File) (int64, error) {
	if totalSize == 0 {
		return 0, nil
	}

	var written int64
	for {
		buf := alignedBuf

**In our tests we also found ext4 does not honor POSIX O_DIRECT/Fdatasync semantics, ext4 trades performance for consistency guarantees. Please avoid ext4 in your setup.**

pkg syscall (netbsd-arm64-cgo), const O_CREAT = 512
pkg syscall (netbsd-arm64-cgo), const OCRNL = 16
pkg syscall (netbsd-arm64-cgo), const OCRNL ideal-int
pkg syscall (netbsd-arm64-cgo), const O_DIRECT = 524288
pkg syscall (netbsd-arm64-cgo), const O_DIRECT ideal-int
pkg syscall (netbsd-arm64-cgo), const O_DIRECTORY = 2097152
pkg syscall (netbsd-arm64-cgo), const O_DIRECTORY ideal-int
pkg syscall (netbsd-arm64-cgo), const O_DSYNC = 65536

pkg syscall (freebsd-arm64), const O_ASYNC = 64
pkg syscall (freebsd-arm64), const O_CLOEXEC = 1048576
pkg syscall (freebsd-arm64), const O_CREAT = 512
pkg syscall (freebsd-arm64), const O_DIRECT = 65536
pkg syscall (freebsd-arm64), const O_DIRECT ideal-int
pkg syscall (freebsd-arm64), const O_DIRECTORY = 131072
pkg syscall (freebsd-arm64), const O_DIRECTORY ideal-int
pkg syscall (freebsd-arm64), const O_EXCL = 2048

pkg syscall (freebsd-386-cgo), const ONOEOT ideal-int
pkg syscall (freebsd-386-cgo), const OPOST ideal-int
pkg syscall (freebsd-386-cgo), const O_ACCMODE ideal-int
pkg syscall (freebsd-386-cgo), const O_DIRECT ideal-int
pkg syscall (freebsd-386-cgo), const O_DIRECTORY ideal-int
pkg syscall (freebsd-386-cgo), const O_EXEC ideal-int
pkg syscall (freebsd-386-cgo), const O_EXLOCK ideal-int