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//go:build linux
package cgroups
import (
"bufio"
"errors"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/opencontainers/cgroups"
"github.com/opencontainers/cgroups/fs"
"github.com/opencontainers/cgroups/fs2"
)
type linuxBlkioHandler struct {
Blkio fs.BlkioGroup
}
func getBlkioHandler() *linuxBlkioHandler {
return &linuxBlkioHandler{}
}
// Apply set the specified constraints
func (c *linuxBlkioHandler) Apply(ctr *CgroupControl, res *cgroups.Resources) error {
if ctr.cgroup2 {
man, err := fs2.NewManager(ctr.config, filepath.Join(cgroupRoot, ctr.config.Path))
if err != nil {
return err
}
return man.Set(res)
}
path := filepath.Join(cgroupRoot, Blkio, ctr.config.Path)
return c.Blkio.Set(path, res)
}
// Create the cgroup
func (c *linuxBlkioHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(Blkio)
}
// Destroy the cgroup
func (c *linuxBlkioHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(Blkio))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *linuxBlkioHandler) Stat(ctr *CgroupControl, m *cgroups.Stats) error {
var ioServiceBytesRecursive []cgroups.BlkioStatEntry
if ctr.cgroup2 {
// more details on the io.stat file format:X https://facebookmicrosites.github.io/cgroup2/docs/io-controller.html
values, err := readCgroup2MapFile(ctr, "io.stat")
if err != nil {
return err
}
for k, v := range values {
d := strings.Split(k, ":")
if len(d) != 2 {
continue
}
minor, err := strconv.ParseUint(d[0], 10, 0)
if err != nil {
return err
}
major, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
for _, item := range v {
d := strings.Split(item, "=")
if len(d) != 2 {
continue
}
op := d[0]
// Accommodate the cgroup v1 naming
switch op {
case "rbytes":
op = "read"
case "wbytes":
op = "write"
}
value, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
entry := cgroups.BlkioStatEntry{
Op: op,
Major: major,
Minor: minor,
Value: value,
}
ioServiceBytesRecursive = append(ioServiceBytesRecursive, entry)
}
}
} else {
BlkioRoot := ctr.getCgroupv1Path(Blkio)
p := filepath.Join(BlkioRoot, "blkio.throttle.io_service_bytes_recursive")
f, err := os.Open(p)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil
}
return fmt.Errorf("open %s: %w", p, err)
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
parts := strings.Fields(line)
if len(parts) < 3 {
continue
}
d := strings.Split(parts[0], ":")
if len(d) != 2 {
continue
}
minor, err := strconv.ParseUint(d[0], 10, 0)
if err != nil {
return err
}
major, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
op := parts[1]
value, err := strconv.ParseUint(parts[2], 10, 0)
if err != nil {
return err
}
entry := cgroups.BlkioStatEntry{
Op: op,
Major: major,
Minor: minor,
Value: value,
}
ioServiceBytesRecursive = append(ioServiceBytesRecursive, entry)
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("parse %s: %w", p, err)
}
}
m.BlkioStats.IoServiceBytesRecursive = ioServiceBytesRecursive
return nil
}
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