Merge remote-tracking branch 'alexlarsson/dm-status' into dm

Conflicts:
	devmapper/deviceset.go

api_params.go

@@ -31,6 +31,11 @@ type APIInfo struct {
 	NEventsListener        int    `json:",omitempty"`
 	KernelVersion          string `json:",omitempty"`
 	IndexServerAddress     string `json:",omitempty"`
+	DevmapperPool          string `json:",omitempty"`
+	DevmapperDataUsed      uint64 `json:",omitempty"`
+	DevmapperDataTotal     uint64 `json:",omitempty"`
+	DevmapperMetadataUsed  uint64 `json:",omitempty"`
+	DevmapperMetadataTotal uint64 `json:",omitempty"`
 }
 
 type APITop struct {

commands.go

@@ -465,6 +465,11 @@ func (cli *DockerCli) CmdInfo(args ...string) error {
 
 	fmt.Fprintf(cli.out, "Containers: %d\n", out.Containers)
 	fmt.Fprintf(cli.out, "Images: %d\n", out.Images)
+	if out.DevmapperDataTotal != 0 {
+		fmt.Fprintf(cli.out, "Devmapper disk use: Data: %.1f/%.1f Metadata: %.1f/%.1f\n",
+			float64(out.DevmapperDataUsed)/(1024*1024), float64(out.DevmapperDataTotal)/(1024*1024),
+			float64(out.DevmapperMetadataUsed)/(1024*1024), float64(out.DevmapperMetadataTotal)/(1024*1024))
+	}
 	if out.Debug || os.Getenv("DEBUG") != "" {
 		fmt.Fprintf(cli.out, "Debug mode (server): %v\n", out.Debug)
 		fmt.Fprintf(cli.out, "Debug mode (client): %v\n", os.Getenv("DEBUG") != "")
@@ -473,6 +478,7 @@ func (cli *DockerCli) CmdInfo(args ...string) error {
 		fmt.Fprintf(cli.out, "LXC Version: %s\n", out.LXCVersion)
 		fmt.Fprintf(cli.out, "EventsListeners: %d\n", out.NEventsListener)
 		fmt.Fprintf(cli.out, "Kernel Version: %s\n", out.KernelVersion)
+		fmt.Fprintf(cli.out, "Devmapper pool: %s\n", out.DevmapperPool)
 	}
 
 	if len(out.IndexServerAddress) != 0 {

devmapper/deviceset.go

@@ -47,6 +47,19 @@ type DeviceSet struct {
 	activeMounts     map[string]int
 }
 
+type DiskUsage struct {
+	Used uint64
+	Total uint64
+}
+
+type Status struct {
+	PoolName string
+	DataLoopback string
+	MetadataLoopback string
+	Data DiskUsage
+	Metadata DiskUsage
+}
+
 func getDevName(name string) string {
 	return "/dev/mapper/" + name
 }
@@ -770,6 +783,39 @@ func (devices *DeviceSet) SetInitialized(hash string) error {
 	return nil
 }
 
+func (devices *DeviceSet) Status() *Status {
+	devices.Lock()
+	defer devices.Unlock()
+
+	status := &Status {}
+
+	if err := devices.ensureInit(); err != nil {
+		return status
+	}
+
+	status.PoolName = devices.getPoolName()
+	status.DataLoopback = path.Join( devices.loopbackDir(), "data")
+	status.MetadataLoopback = path.Join( devices.loopbackDir(), "metadata")
+
+	_, totalSizeInSectors, _, params, err := getStatus(devices.getPoolName())
+	if err == nil {
+		var transactionId, dataUsed, dataTotal, metadataUsed, metadataTotal uint64
+		if _, err := fmt.Sscanf(params, "%d %d/%d %d/%d", &transactionId, &metadataUsed, &metadataTotal, &dataUsed, &dataTotal); err == nil {
+			// Convert from blocks to bytes
+			blockSizeInSectors := totalSizeInSectors / dataTotal;
+
+			status.Data.Used = dataUsed * blockSizeInSectors * 512
+			status.Data.Total = dataTotal * blockSizeInSectors * 512
+
+			// metadata blocks are always 4k
+			status.Metadata.Used = metadataUsed * 4096
+			status.Metadata.Total = metadataTotal * 4096
+		}
+	}
+
+	return status
+}
+
 func (devices *DeviceSet) ensureInit() error {
 	if !devices.initialized {
 		devices.initialized = true

server.go

@@ -268,6 +268,8 @@ func (srv *Server) DockerInfo() *APIInfo {
 		kernelVersion = kv.String()
 	}
 
+	devSetInfo := srv.runtime.deviceSet.Status()
+
 	return &APIInfo{
 		Containers:             len(srv.runtime.List()),
 		Images:                 imgcount,
@@ -281,6 +283,11 @@ func (srv *Server) DockerInfo() *APIInfo {
 		NEventsListener:        len(srv.events),
 		KernelVersion:          kernelVersion,
 		IndexServerAddress:     auth.IndexServerAddress(),
+		DevmapperPool:          devSetInfo.PoolName,
+		DevmapperDataUsed:      devSetInfo.Data.Used,
+		DevmapperDataTotal:     devSetInfo.Data.Total,
+		DevmapperMetadataUsed:  devSetInfo.Metadata.Used,
+		DevmapperMetadataTotal: devSetInfo.Metadata.Total,
 	}
 }