b9e70f0240
root cgroup. To make cadvisor detect all the disks, the rootfs of host needs to mounted inside cadvisor.
76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
// +build linux
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//
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// Provides Filesystem Stats
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package fs
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/*
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extern int getBytesFree(const char *path, unsigned long long *bytes);
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extern int getBytesTotal(const char *path, unsigned long long *bytes);
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*/
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import "C"
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import (
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"strings"
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"syscall"
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"unsafe"
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"github.com/docker/docker/pkg/mount"
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"github.com/golang/glog"
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)
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type FsInfoImpl struct{}
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func NewFsInfo() FsInfo {
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return &FsInfoImpl{}
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}
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func (*FsInfoImpl) GetFsStats() ([]FsStat, error) {
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filesystems := make([]FsStat, 0)
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mounts, err := mount.GetMounts()
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if err != nil {
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return nil, err
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}
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processedPartitions := make(map[string]bool, 0)
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for _, mount := range mounts {
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if !strings.HasPrefix(mount.Fstype, "ext") {
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continue
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}
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// Avoid bind mounts.
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if _, ok := processedPartitions[mount.Source]; ok {
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continue
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}
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total, free, err := getVfsStats(mount.Mountpoint)
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if err != nil {
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glog.Errorf("Statvfs failed. Error: %v", err)
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} else {
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glog.V(1).Infof("%s is an %s partition at %s. Total: %d, Free: %d", mount.Source, mount.Fstype, mount.Mountpoint, total, free)
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fsStat := FsStat{
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Device: mount.Source,
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Major: uint(mount.Major),
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Minor: uint(mount.Minor),
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Capacity: total,
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Free: free,
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}
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filesystems = append(filesystems, fsStat)
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processedPartitions[mount.Source] = true
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}
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}
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return filesystems, nil
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}
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func getVfsStats(path string) (total uint64, free uint64, err error) {
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_p0, err := syscall.BytePtrFromString(path)
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if err != nil {
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return 0, 0, err
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}
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res, err := C.getBytesFree((*C.char)(unsafe.Pointer(_p0)), (*_Ctype_ulonglong)(unsafe.Pointer(&free)))
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if res != 0 {
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return 0, 0, err
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}
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res, err = C.getBytesTotal((*C.char)(unsafe.Pointer(_p0)), (*_Ctype_ulonglong)(unsafe.Pointer(&total)))
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if res != 0 {
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return 0, 0, err
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}
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return total, free, nil
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}
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