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affd6e3216
Fixes #635 Remove `Hotplugged bool` field from device and add two new fields instead: * `RefCount`: how many references to this device. One device can be referenced(`NewDevice()`) many times by same/different container(s), two devices are regarded identical if they have same hostPath * `AttachCount`: how many times this device has been attached. A device can only be hotplugged once to the qemu, every new Attach command will add the AttachCount, and real `Detach` will be done only when `AttachCount == 0` Signed-off-by: Wei Zhang <zhangwei555@huawei.com>
83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright (c) 2017-2018 Intel Corporation
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// Copyright (c) 2018 Huawei Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package drivers
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import (
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"encoding/hex"
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"github.com/kata-containers/runtime/virtcontainers/device/api"
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"github.com/kata-containers/runtime/virtcontainers/device/config"
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"github.com/kata-containers/runtime/virtcontainers/utils"
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)
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// VhostUserSCSIDevice is a SCSI vhost-user based device
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type VhostUserSCSIDevice struct {
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*GenericDevice
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config.VhostUserDeviceAttrs
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}
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//
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// VhostUserSCSIDevice's implementation of the device interface:
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//
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// Attach is standard interface of api.Device, it's used to add device to some
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// DeviceReceiver
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func (device *VhostUserSCSIDevice) Attach(devReceiver api.DeviceReceiver) (err error) {
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skip, err := device.bumpAttachCount(true)
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if err != nil {
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return err
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}
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if skip {
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return nil
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}
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// generate a unique ID to be used for hypervisor commandline fields
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randBytes, err := utils.GenerateRandomBytes(8)
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if err != nil {
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return err
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}
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id := hex.EncodeToString(randBytes)
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device.DevID = id
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device.Type = device.DeviceType()
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defer func() {
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if err == nil {
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device.AttachCount = 1
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}
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}()
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return devReceiver.AppendDevice(device)
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}
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// Detach is standard interface of api.Device, it's used to remove device from some
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// DeviceReceiver
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func (device *VhostUserSCSIDevice) Detach(devReceiver api.DeviceReceiver) error {
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skip, err := device.bumpAttachCount(false)
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if err != nil {
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return err
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}
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if skip {
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return nil
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}
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device.AttachCount = 0
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return nil
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}
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// DeviceType is standard interface of api.Device, it returns device type
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func (device *VhostUserSCSIDevice) DeviceType() config.DeviceType {
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return config.VhostUserSCSI
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}
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// GetDeviceInfo returns device information used for creating
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func (device *VhostUserSCSIDevice) GetDeviceInfo() interface{} {
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device.Type = device.DeviceType()
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return &device.VhostUserDeviceAttrs
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}
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// It should implement GetAttachCount() and DeviceID() as api.Device implementation
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// here it shares function from *GenericDevice so we don't need duplicate codes
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