node_exporter/collector/filesystem_linux.go

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// +build !nofilesystem
package collector
import (
"bufio"
"fmt"
"os"
"strings"
"syscall"
"github.com/prometheus/log"
)
const (
defIgnoredMountPoints = "^/(sys|proc|dev)($|/)"
)
var (
filesystemLabelNames = []string{"device", "mountpoint", "fstype"}
)
type filesystemDetails struct {
device string
mountPoint string
fsType string
}
// Expose filesystem fullness.
func (c *filesystemCollector) GetStats() (stats []filesystemStats, err error) {
mpds, err := mountPointDetails()
if err != nil {
return nil, err
}
stats = []filesystemStats{}
for _, mpd := range mpds {
if c.ignoredMountPointsPattern.MatchString(mpd.mountPoint) {
log.Debugf("Ignoring mount point: %s", mpd.mountPoint)
continue
}
buf := new(syscall.Statfs_t)
err := syscall.Statfs(mpd.mountPoint, buf)
if err != nil {
return nil, fmt.Errorf("Statfs on %s returned %s",
mpd.mountPoint, err)
}
labelValues := []string{mpd.device, mpd.mountPoint, mpd.fsType}
stats = append(stats, filesystemStats{
labelValues: labelValues,
size: float64(buf.Blocks) * float64(buf.Bsize),
free: float64(buf.Bfree) * float64(buf.Bsize),
avail: float64(buf.Bavail) * float64(buf.Bsize),
files: float64(buf.Files),
filesFree: float64(buf.Ffree),
})
}
return stats, nil
}
func mountPointDetails() ([]filesystemDetails, error) {
file, err := os.Open(procFilePath("mounts"))
if err != nil {
return nil, err
}
defer file.Close()
filesystems := []filesystemDetails{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
filesystems = append(filesystems, filesystemDetails{parts[0], parts[1], parts[2]})
}
return filesystems, nil
}