67 lines
1.1 KiB
Go
67 lines
1.1 KiB
Go
package system
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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"syscall"
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)
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type diskInfoCache struct {
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stat syscall.Stat_t
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values map[string]string
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}
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var udevPath = "/run/udev/data"
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func (s *DiskIOStats) diskInfo(devName string) (map[string]string, error) {
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fi, err := os.Stat("/dev/" + devName)
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if err != nil {
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return nil, err
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}
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stat, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return nil, nil
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}
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if s.infoCache == nil {
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s.infoCache = map[string]diskInfoCache{}
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}
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ic, ok := s.infoCache[devName]
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if ok {
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return ic.values, nil
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} else {
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ic = diskInfoCache{
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stat: *stat,
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values: map[string]string{},
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}
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s.infoCache[devName] = ic
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}
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di := ic.values
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major := stat.Rdev >> 8 & 0xff
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minor := stat.Rdev & 0xff
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f, err := os.Open(fmt.Sprintf("%s/b%d:%d", udevPath, major, minor))
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if err != nil {
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return nil, err
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}
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defer f.Close()
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scnr := bufio.NewScanner(f)
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for scnr.Scan() {
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l := scnr.Text()
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if len(l) < 4 || l[:2] != "E:" {
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continue
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}
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kv := strings.SplitN(l[2:], "=", 2)
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if len(kv) < 2 {
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continue
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}
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di[kv[0]] = kv[1]
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}
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return di, nil
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}
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