80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
// Copyright 2018 The gVisor Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package linux
|
|
|
|
import "encoding/binary"
|
|
|
|
// AIORingSize is sizeof(struct aio_ring).
|
|
const AIORingSize = 32
|
|
|
|
// I/O commands.
|
|
const (
|
|
IOCB_CMD_PREAD = 0
|
|
IOCB_CMD_PWRITE = 1
|
|
IOCB_CMD_FSYNC = 2
|
|
IOCB_CMD_FDSYNC = 3
|
|
// 4 was the experimental IOCB_CMD_PREADX.
|
|
IOCB_CMD_POLL = 5
|
|
IOCB_CMD_NOOP = 6
|
|
IOCB_CMD_PREADV = 7
|
|
IOCB_CMD_PWRITEV = 8
|
|
)
|
|
|
|
// I/O flags.
|
|
const (
|
|
IOCB_FLAG_RESFD = 1
|
|
IOCB_FLAG_IOPRIO = 2
|
|
)
|
|
|
|
// IOCallback describes an I/O request.
|
|
//
|
|
// The priority field is currently ignored in the implementation below. Also
|
|
// note that the IOCB_FLAG_RESFD feature is not supported.
|
|
//
|
|
// +marshal
|
|
type IOCallback struct {
|
|
Data uint64
|
|
Key uint32
|
|
_ uint32
|
|
|
|
OpCode uint16
|
|
ReqPrio int16
|
|
FD int32
|
|
|
|
Buf uint64
|
|
Bytes uint64
|
|
Offset int64
|
|
|
|
Reserved2 uint64
|
|
Flags uint32
|
|
|
|
// eventfd to signal if IOCB_FLAG_RESFD is set in flags.
|
|
ResFD int32
|
|
}
|
|
|
|
// IOEvent describes an I/O result.
|
|
//
|
|
// +marshal
|
|
// +stateify savable
|
|
type IOEvent struct {
|
|
Data uint64
|
|
Obj uint64
|
|
Result int64
|
|
Result2 int64
|
|
}
|
|
|
|
// IOEventSize is the size of an ioEvent encoded.
|
|
var IOEventSize = binary.Size(IOEvent{})
|