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// Copyright 2021 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.
//go:build linux
// +build linux
package sysfs
import (
"os"
"path/filepath"
"regexp"
)
const sasHostClassPath = "class/sas_host"
type SASHost struct {
Name string // /sys/class/sas_host/<Name>
SASPhys []string // /sys/class/sas_host/<Name>/device/phy-*
SASPorts []string // /sys/class/sas_host/<Name>/device/ports-*
}
type SASHostClass map[string]*SASHost
var (
sasPhyDeviceRegexp = regexp.MustCompile(`^phy-[0-9:]+$`)
sasPortDeviceRegexp = regexp.MustCompile(`^port-[0-9:]+$`)
)
// SASHostClass parses host[0-9]+ devices in /sys/class/sas_host.
// This generally only exists so that it can pull in SAS Port and SAS
// PHY entries.
//
// The sas_host class doesn't collect any obvious statistics. Each
// sas_host contains a scsi_host, which seems to collect a couple
// minor stats (ioc_reset_count and reply_queue_count), but they're
// not worth collecting at this time. There are more useful SAS stats
// in the sas_phy class.
func (fs FS) SASHostClass() (SASHostClass, error) {
path := fs.sys.Path(sasHostClassPath)
dirs, err := os.ReadDir(path)
if err != nil {
return nil, err
}
shc := make(SASHostClass, len(dirs))
for _, d := range dirs {
host, err := fs.parseSASHost(d.Name())
if err != nil {
return nil, err
}
shc[host.Name] = host
}
return shc, nil
}
// Parse a single sas_host.
func (fs FS) parseSASHost(name string) (*SASHost, error) {
//path := fs.sys.Path(sasHostClassPath, name)
host := SASHost{Name: name}
devicepath := fs.sys.Path(filepath.Join(sasHostClassPath, name, "device"))
dirs, err := os.ReadDir(devicepath)
if err != nil {
return nil, err
}
for _, d := range dirs {
if sasPhyDeviceRegexp.MatchString(d.Name()) {
host.SASPhys = append(host.SASPhys, d.Name())
}
if sasPortDeviceRegexp.MatchString(d.Name()) {
host.SASPorts = append(host.SASPorts, d.Name())
}
}
return &host, nil
}
// GetByName returns the SASHost with the provided name.
func (shc *SASHostClass) GetByName(hostName string) *SASHost {
return (*shc)[hostName]
}
// GetByPhy finds the SASHost that contains the provided PHY name.
func (shc *SASHostClass) GetByPhy(phyName string) *SASHost {
for _, h := range *shc {
for _, p := range h.SASPhys {
if p == phyName {
return h
}
}
}
return nil
}
// GetByPort finds the SASHost that contains the provided SAS Port name.
func (shc *SASHostClass) GetByPort(portName string) *SASHost {
for _, h := range *shc {
for _, p := range h.SASPorts {
if p == portName {
return h
}
}
}
return nil
}
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