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// 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 (
"bytes"
"unsafe"
"github.com/prometheus/common/log"
"golang.org/x/sys/unix"
)
const (
defIgnoredMountPoints = "^/(dev)($|/)"
defIgnoredFSTypes = "^devfs$"
readOnly = 0x1 // MNT_RDONLY
noWait = 0x2 // MNT_NOWAIT
)
func gostring(b []int8) string {
bb := *(*[]byte)(unsafe.Pointer(&b))
idx := bytes.IndexByte(bb, 0)
if idx < 0 {
return ""
}
return string(bb[:idx])
}
// Expose filesystem fullness.
func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
n, err := unix.Getfsstat(nil, noWait)
if err != nil {
return nil, err
}
buf := make([]unix.Statfs_t, n)
_, err = unix.Getfsstat(buf, noWait)
if err != nil {
return nil, err
}
stats := []filesystemStats{}
for _, fs := range buf {
mountpoint := gostring(fs.Mntonname[:])
if c.ignoredMountPointsPattern.MatchString(mountpoint) {
log.Debugf("Ignoring mount point: %s", mountpoint)
continue
}
device := gostring(fs.Mntfromname[:])
fstype := gostring(fs.Fstypename[:])
if c.ignoredFSTypesPattern.MatchString(fstype) {
log.Debugf("Ignoring fs type: %s", fstype)
continue
}
var ro float64
if (fs.Flags & readOnly) != 0 {
ro = 1
}
stats = append(stats, filesystemStats{
labels: filesystemLabels{
device: device,
mountPoint: mountpoint,
fsType: fstype,
},
size: float64(fs.Blocks) * float64(fs.Bsize),
free: float64(fs.Bfree) * float64(fs.Bsize),
avail: float64(fs.Bavail) * float64(fs.Bsize),
files: float64(fs.Files),
filesFree: float64(fs.Ffree),
ro: ro,
})
}
return stats, nil
}
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