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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 (
"fmt"
"os"
"path/filepath"
"github.com/prometheus/procfs/internal/util"
)
const nvmeClassPath = "class/nvme"
// NVMeDevice contains info from files in /sys/class/nvme for a single NVMe device.
type NVMeDevice struct {
Name string
Serial string // /sys/class/nvme/<Name>/serial
Model string // /sys/class/nvme/<Name>/model
State string // /sys/class/nvme/<Name>/state
FirmwareRevision string // /sys/class/nvme/<Name>/firmware_rev
}
// NVMeClass is a collection of every NVMe device in /sys/class/nvme.
//
// The map keys are the names of the NVMe devices.
type NVMeClass map[string]NVMeDevice
// NVMeClass returns info for all NVMe devices read from /sys/class/nvme.
func (fs FS) NVMeClass() (NVMeClass, error) {
path := fs.sys.Path(nvmeClassPath)
dirs, err := os.ReadDir(path)
if err != nil {
return nil, fmt.Errorf("failed to list NVMe devices at %q: %w", path, err)
}
nc := make(NVMeClass, len(dirs))
for _, d := range dirs {
device, err := fs.parseNVMeDevice(d.Name())
if err != nil {
return nil, err
}
nc[device.Name] = *device
}
return nc, nil
}
// Parse one NVMe device.
func (fs FS) parseNVMeDevice(name string) (*NVMeDevice, error) {
path := fs.sys.Path(nvmeClassPath, name)
device := NVMeDevice{Name: name}
for _, f := range [...]string{"firmware_rev", "model", "serial", "state"} {
name := filepath.Join(path, f)
value, err := util.SysReadFile(name)
if err != nil {
return nil, fmt.Errorf("failed to read file %q: %w", name, err)
}
switch f {
case "firmware_rev":
device.FirmwareRevision = value
case "model":
device.Model = value
case "serial":
device.Serial = value
case "state":
device.State = value
}
}
return &device, nil
}
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