mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-28 23:19:46 -08:00
89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nofilesystem
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package collector
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import (
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"bytes"
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"unsafe"
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"github.com/go-kit/kit/log/level"
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"golang.org/x/sys/unix"
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)
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const (
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defIgnoredMountPoints = "^/(dev)($|/)"
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defIgnoredFSTypes = "^devfs$"
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readOnly = 0x1 // MNT_RDONLY
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noWait = 0x2 // MNT_NOWAIT
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)
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func gostring(b []int8) string {
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bb := *(*[]byte)(unsafe.Pointer(&b))
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idx := bytes.IndexByte(bb, 0)
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if idx < 0 {
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return ""
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}
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return string(bb[:idx])
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}
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// Expose filesystem fullness.
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func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
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n, err := unix.Getfsstat(nil, noWait)
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if err != nil {
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return nil, err
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}
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buf := make([]unix.Statfs_t, n)
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_, err = unix.Getfsstat(buf, noWait)
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if err != nil {
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return nil, err
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}
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stats := []filesystemStats{}
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for _, fs := range buf {
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mountpoint := gostring(fs.Mntonname[:])
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if c.ignoredMountPointsPattern.MatchString(mountpoint) {
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level.Debug(c.logger).Log("msg", "Ignoring mount point", "mountpoint", mountpoint)
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continue
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}
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device := gostring(fs.Mntfromname[:])
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fstype := gostring(fs.Fstypename[:])
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if c.ignoredFSTypesPattern.MatchString(fstype) {
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level.Debug(c.logger).Log("msg", "Ignoring fs type", "type", fstype)
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continue
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}
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var ro float64
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if (fs.Flags & readOnly) != 0 {
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ro = 1
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}
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stats = append(stats, filesystemStats{
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labels: filesystemLabels{
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device: device,
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mountPoint: rootfsStripPrefix(mountpoint),
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fsType: fstype,
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},
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size: float64(fs.Blocks) * float64(fs.Bsize),
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free: float64(fs.Bfree) * float64(fs.Bsize),
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avail: float64(fs.Bavail) * float64(fs.Bsize),
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files: float64(fs.Files),
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filesFree: float64(fs.Ffree),
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ro: ro,
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})
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}
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return stats, nil
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}
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