Filesystem stats are now per container. As of now, fs stats are reported only for the

root cgroup.
To make cadvisor detect all the disks, the rootfs of host needs to mounted
inside cadvisor.

README.md

@@ -12,6 +12,7 @@ To quickly tryout cAdvisor on your machine with Docker (version 0.11 or above),
 
 ```
 sudo docker run \
+  --volume=/:/rootfs:ro \
   --volume=/var/run:/var/run:rw \
   --volume=/sys:/sys:ro \
   --volume=/var/lib/docker/:/var/lib/docker:ro \

container/raw/handler.go

@@ -41,7 +41,7 @@ type rawContainerHandler struct {
 	watcher            *inotify.Watcher
 	stopWatcher        chan error
 	watches            map[string]struct{}
-	fsInfo fs.FsInfo
+	fsInfo             fs.FsInfo
 }
 
 func newRawContainerHandler(name string, cgroupSubsystems *cgroupSubsystems, machineInfoFactory info.MachineInfoFactory) (container.ContainerHandler, error) {
@@ -55,7 +55,7 @@ func newRawContainerHandler(name string, cgroupSubsystems *cgroupSubsystems, mac
 		machineInfoFactory: machineInfoFactory,
 		stopWatcher:        make(chan error),
 		watches:            make(map[string]struct{}),
-		fsInfo: fs.NewFsInfo(),
+		fsInfo:             fs.NewFsInfo(),
 	}, nil
 }
 
@@ -144,6 +144,10 @@ func (self *rawContainerHandler) GetSpec() (info.ContainerSpec, error) {
 		}
 	}
 
+	// Fs.
+	if self.name == "/" {
+		spec.HasFs = true
+	}
 	return spec, nil
 }
 
@@ -152,12 +156,14 @@ func (self *rawContainerHandler) GetStats() (*info.ContainerStats, error) {
 	if err != nil {
 		return nil, err
 	}
-	// Get Filesystem information
-	fsStats, err := self.fsInfo.GetFsStats(self.name)
-	if err != nil {
-		return nil, err
+	// Get Filesystem information only for the root cgroup.
+	if self.name == "/" {
+		stats.Fs, err = self.fsInfo.GetFsStats()
+		if err != nil {
+			return nil, err
+		}
 	}
-	stats.FsStats = fsStats
+
 	return stats, nil
 }
 

deploy/Dockerfile

@@ -3,6 +3,7 @@ MAINTAINER dengnan@google.com vmarmol@google.com vishnuk@google.com
 
 # Grab cadvisor from the staging directory.
 ADD cadvisor /usr/bin/cadvisor
+RUN mkdir /rootfs
 
 EXPOSE 8080
 ENTRYPOINT ["/usr/bin/cadvisor"]

fs/fs.go

@@ -10,6 +10,7 @@ package fs
 import "C"
 
 import (
+	"strings"
 	"syscall"
 	"unsafe"
 
@@ -17,33 +18,41 @@ import (
 	"github.com/golang/glog"
 )
 
-const EXT_SUPER_MAGIC = 0xEF53
-
 type FsInfoImpl struct{}
 
 func NewFsInfo() FsInfo {
 	return &FsInfoImpl{}
 }
 
-func (*FsInfoImpl) GetFsStats(containerName string) ([]FsStat, error) {
+func (*FsInfoImpl) GetFsStats() ([]FsStat, error) {
 	filesystems := make([]FsStat, 0)
-	if containerName != "/" {
-		return filesystems, nil
-	}
 	mounts, err := mount.GetMounts()
 	if err != nil {
 		return nil, err
 	}
+	processedPartitions := make(map[string]bool, 0)
 	for _, mount := range mounts {
-		if !strings.HasPrefix("ext", mount.FsType) || mount.Mountpoint != mount.Root {
+		if !strings.HasPrefix(mount.Fstype, "ext") {
+			continue
+		}
+		// Avoid bind mounts.
+		if _, ok := processedPartitions[mount.Source]; ok {
 			continue
 		}
 		total, free, err := getVfsStats(mount.Mountpoint)
 		if err != nil {
 			glog.Errorf("Statvfs failed. Error: %v", err)
 		} else {
-			glog.V(1).Infof("%s is an ext partition at %s. Total: %d, Free: %d", mount.Source, mount.Mountpoint, total, free)
-			filesystems = append(filesystems, FsStat{mount.Source, total, free})
+			glog.V(1).Infof("%s is an %s partition at %s. Total: %d, Free: %d", mount.Source, mount.Fstype, mount.Mountpoint, total, free)
+			fsStat := FsStat{
+				Device:   mount.Source,
+				Major:    uint(mount.Major),
+				Minor:    uint(mount.Minor),
+				Capacity: total,
+				Free:     free,
+			}
+			filesystems = append(filesystems, fsStat)
+			processedPartitions[mount.Source] = true
 		}
 	}
 	return filesystems, nil

fs/types.go

@@ -1,12 +1,14 @@
 package fs
 
 type FsStat struct {
-	Name     string `json:"name"`
+	Device   string `json:"device,omitempty"`
+	Major    uint   `json:"major"`
+	Minor    uint   `json:"minor"`
 	Capacity uint64 `json:"capacity"`
 	Free     uint64 `json:"free"`
 }
 
 type FsInfo interface {
-	// Returns capacity and free space, in bytes, of all the ext2, ext3, ext4 filesystems used by container 'containerName'.
-	GetFsStats(containerName string) ([]FsStat, error)
+	// Returns capacity and free space, in bytes, of all the ext2, ext3, ext4 filesystems on the host.
+	GetFsStats() ([]FsStat, error)
 }

info/container.go

@@ -17,7 +17,7 @@ package info
 import (
 	"reflect"
 	"time"
-	
+
 	"github.com/google/cadvisor/fs"
 )
 
@@ -49,6 +49,8 @@ type ContainerSpec struct {
 	Memory    MemorySpec `json:"memory,omitempty"`
 
 	HasNetwork bool `json:"has_network"`
+
+	HasFs bool `json:"has_fs"`
 }
 
 // Container reference contains enough information to uniquely identify a container
@@ -239,7 +241,7 @@ type ContainerStats struct {
 	Memory    *MemoryStats  `json:"memory,omitempty"`
 	Network   *NetworkStats `json:"network,omitempty"`
 	// Filesystem statistics
-	FsStats []fs.FsStat `json:"fs_stats,omitempty"`
+	Fs []fs.FsStat `json:"fs,omitempty"`
 }
 
 // Makes a deep copy of the ContainerStats and returns a pointer to the new