Add support for blkio read/write bps device

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>

opts/opts.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/docker/docker/pkg/blkiodev"
 	"github.com/docker/docker/pkg/parsers"
+	"github.com/docker/docker/pkg/units"
 )
 
 var (
@@ -173,6 +174,9 @@ type ValidatorFctType func(val string) (string, error)
 // ValidatorWeightFctType defines a validator function that returns a validated struct and/or an error.
 type ValidatorWeightFctType func(val string) (*blkiodev.WeightDevice, error)
 
+// ValidatorThrottleFctType defines a validator function that returns a validated struct and/or an error.
+type ValidatorThrottleFctType func(val string) (*blkiodev.ThrottleDevice, error)
+
 // ValidatorFctListType defines a validator function that returns a validated list of string and/or an error
 type ValidatorFctListType func(val string) ([]string, error)
 
@@ -210,6 +214,29 @@ func ValidateWeightDevice(val string) (*blkiodev.WeightDevice, error) {
 	}, nil
 }
 
+// ValidateThrottleBpsDevice validates that the specified string has a valid device-rate format.
+func ValidateThrottleBpsDevice(val string) (*blkiodev.ThrottleDevice, error) {
+	split := strings.SplitN(val, ":", 2)
+	if len(split) != 2 {
+		return nil, fmt.Errorf("bad format: %s", val)
+	}
+	if !strings.HasPrefix(split[0], "/dev/") {
+		return nil, fmt.Errorf("bad format for device path: %s", val)
+	}
+	rate, err := units.RAMInBytes(split[1])
+	if err != nil {
+		return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>[<unit>]. Number must be a positive integer. Unit is optional and can be kb, mb, or gb", val)
+	}
+	if rate < 0 {
+		return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>[<unit>]. Number must be a positive integer. Unit is optional and can be kb, mb, or gb", val)
+	}
+
+	return &blkiodev.ThrottleDevice{
+		Path: split[0],
+		Rate: uint64(rate),
+	}, nil
+}
+
 // ValidateLink validates that the specified string has a valid link format (containerName:alias).
 func ValidateLink(val string) (string, error) {
 	if _, _, err := parsers.ParseLink(val); err != nil {

opts/throttledevice.go

@@ -0,0 +1,56 @@
+package opts
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/pkg/blkiodev"
+)
+
+// ThrottledeviceOpt defines a map of ThrottleDevices
+type ThrottledeviceOpt struct {
+	values    []*blkiodev.ThrottleDevice
+	validator ValidatorThrottleFctType
+}
+
+// NewThrottledeviceOpt creates a new ThrottledeviceOpt
+func NewThrottledeviceOpt(validator ValidatorThrottleFctType) ThrottledeviceOpt {
+	values := []*blkiodev.ThrottleDevice{}
+	return ThrottledeviceOpt{
+		values:    values,
+		validator: validator,
+	}
+}
+
+// Set validates a ThrottleDevice and sets its name as a key in ThrottledeviceOpt
+func (opt *ThrottledeviceOpt) Set(val string) error {
+	var value *blkiodev.ThrottleDevice
+	if opt.validator != nil {
+		v, err := opt.validator(val)
+		if err != nil {
+			return err
+		}
+		value = v
+	}
+	(opt.values) = append((opt.values), value)
+	return nil
+}
+
+// String returns ThrottledeviceOpt values as a string.
+func (opt *ThrottledeviceOpt) String() string {
+	var out []string
+	for _, v := range opt.values {
+		out = append(out, v.String())
+	}
+
+	return fmt.Sprintf("%v", out)
+}
+
+// GetList returns a slice of pointers to ThrottleDevices.
+func (opt *ThrottledeviceOpt) GetList() []*blkiodev.ThrottleDevice {
+	var throttledevice []*blkiodev.ThrottleDevice
+	for _, v := range opt.values {
+		throttledevice = append(throttledevice, v)
+	}
+
+	return throttledevice
+}