node_exporter/collector/filesystem_linux.go
Tobias Schmidt d290ea94b8 Fix export of stale device error metrics for unmounted filesystems
Instead of maintaining a counter metric for device errors in memory,
this change exports a gauge and uses const metrics to avoid leaking
metrics for unmounted filesystems.
2017-03-22 21:48:18 -03:00

98 lines
2.5 KiB
Go

// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nofilesystem
package collector
import (
"bufio"
"os"
"strings"
"syscall"
"github.com/prometheus/common/log"
)
const (
defIgnoredMountPoints = "^/(sys|proc|dev)($|/)"
defIgnoredFSTypes = "^(sys|proc|auto)fs$"
readOnly = 0x1 // ST_RDONLY
)
// GetStats returns filesystem stats.
func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
mps, err := mountPointDetails()
if err != nil {
return nil, err
}
stats := []filesystemStats{}
for _, labels := range mps {
if c.ignoredMountPointsPattern.MatchString(labels.mountPoint) {
log.Debugf("Ignoring mount point: %s", labels.mountPoint)
continue
}
if c.ignoredFSTypesPattern.MatchString(labels.fsType) {
log.Debugf("Ignoring fs type: %s", labels.fsType)
continue
}
buf := new(syscall.Statfs_t)
err := syscall.Statfs(labels.mountPoint, buf)
if err != nil {
stats = append(stats, filesystemStats{
labels: labels,
deviceError: 1,
})
log.Errorf("Error on statfs() system call for %q: %s", labels.mountPoint, err)
continue
}
var ro float64
if (buf.Flags & readOnly) != 0 {
ro = 1
}
stats = append(stats, filesystemStats{
labels: labels,
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),
ro: ro,
})
}
return stats, nil
}
func mountPointDetails() ([]filesystemLabels, error) {
file, err := os.Open(procFilePath("mounts"))
if err != nil {
return nil, err
}
defer file.Close()
filesystems := []filesystemLabels{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
filesystems = append(filesystems, filesystemLabels{
device: parts[0],
mountPoint: parts[1],
fsType: parts[2],
})
}
return filesystems, scanner.Err()
}