Pod Device-Read-BPS support

added the option for the user to specify a rate, in bytes, at which they would like to be able
to read from the device being added to the pod. This is the first in a line of pod device options.

WARNING: changed pod name json tag to pod_name to avoid confusion when marshaling with the containerspec's name

Signed-off-by: cdoern <cdoern@redhat.com>

3 files changed, 26 insertions, 5 deletions

diff --git a/pkg/specgen/generate/container.go b/pkg/specgen/generate/container.go
index ae26807a9..f3ee42b2f 100644
--- a/pkg/specgen/generate/container.go
+++ b/pkg/specgen/generate/container.go
@@ -191,9 +191,6 @@ func CompleteSpec(ctx context.Context, r *libpod.Runtime, s *specgen.SpecGenerat
 	if len(s.User) == 0 && inspectData != nil {
 		s.User = inspectData.Config.User
 	}
-	if err := finishThrottleDevices(s); err != nil {
-		return nil, err
-	}
 	// Unless already set via the CLI, check if we need to disable process
 	// labels or set the defaults.
 	if len(s.SelinuxOpts) == 0 {
@@ -251,10 +248,10 @@ func CompleteSpec(ctx context.Context, r *libpod.Runtime, s *specgen.SpecGenerat
 	return warnings, nil
 }
 
-// finishThrottleDevices takes the temporary representation of the throttle
+// FinishThrottleDevices takes the temporary representation of the throttle
 // devices in the specgen and looks up the major and major minors. it then
 // sets the throttle devices proper in the specgen
-func finishThrottleDevices(s *specgen.SpecGenerator) error {
+func FinishThrottleDevices(s *specgen.SpecGenerator) error {
 	if bps := s.ThrottleReadBpsDevice; len(bps) > 0 {
 		for k, v := range bps {
 			statT := unix.Stat_t{}
@@ -263,6 +260,9 @@ func finishThrottleDevices(s *specgen.SpecGenerator) error {
 			}
 			v.Major = (int64(unix.Major(uint64(statT.Rdev))))
 			v.Minor = (int64(unix.Minor(uint64(statT.Rdev))))
+			if s.ResourceLimits.BlockIO == nil {
+				s.ResourceLimits.BlockIO = new(spec.LinuxBlockIO)
+			}
 			s.ResourceLimits.BlockIO.ThrottleReadBpsDevice = append(s.ResourceLimits.BlockIO.ThrottleReadBpsDevice, v)
 		}
 	}
diff --git a/pkg/specgen/generate/container_create.go b/pkg/specgen/generate/container_create.go
index fefa9b4a9..11027ebdb 100644
--- a/pkg/specgen/generate/container_create.go
+++ b/pkg/specgen/generate/container_create.go
@@ -2,6 +2,7 @@ package generate
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -52,6 +53,24 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 	if infraConfig != nil && len(infraConfig.Spec.Linux.Devices) > 0 {
 		s.DevicesFrom = append(s.DevicesFrom, infraConfig.ID)
 	}
+	if infraConfig != nil && infraConfig.Spec.Linux.Resources != nil && infraConfig.Spec.Linux.Resources.BlockIO != nil && len(infraConfig.Spec.Linux.Resources.BlockIO.ThrottleReadBpsDevice) > 0 {
+		tempDev := make(map[string]spec.LinuxThrottleDevice)
+		for _, val := range infraConfig.Spec.Linux.Resources.BlockIO.ThrottleReadBpsDevice {
+			nodes, err := util.FindDeviceNodes()
+			if err != nil {
+				return nil, nil, nil, err
+			}
+			key := fmt.Sprintf("%d:%d", val.Major, val.Minor)
+			tempDev[nodes[key]] = spec.LinuxThrottleDevice{Rate: uint64(val.Rate)}
+		}
+		for i, dev := range s.ThrottleReadBpsDevice {
+			tempDev[i] = dev
+		}
+		s.ThrottleReadBpsDevice = tempDev
+	}
+	if err := FinishThrottleDevices(s); err != nil {
+		return nil, nil, nil, err
+	}
 	// Set defaults for unset namespaces
 	if s.PidNS.IsDefault() {
 		defaultNS, err := GetDefaultNamespaceMode("pid", rtc, pod)
diff --git a/pkg/specgen/podspecgen.go b/pkg/specgen/podspecgen.go
index 83fa9426c..ee4fbc13a 100644
--- a/pkg/specgen/podspecgen.go
+++ b/pkg/specgen/podspecgen.go
@@ -201,6 +201,8 @@ type PodResourceConfig struct {
 	CPUPeriod uint64 `json:"cpu_period,omitempty"`
 	// CPU quota of the cpuset, determined by --cpus
 	CPUQuota int64 `json:"cpu_quota,omitempty"`
+	// ThrottleReadBpsDevice contains the rate at which the devices in the pod can be read from/accessed
+	ThrottleReadBpsDevice map[string]spec.LinuxThrottleDevice `json:"throttleReadBpsDevice,omitempty"`
 }
 
 // NewPodSpecGenerator creates a new pod spec