2018-07-06 16:09:34 +00:00
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// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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)
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var (
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statuslineRE = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
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buildlineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
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)
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// MDStat holds info parsed from /proc/mdstat.
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type MDStat struct {
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// Name of the device.
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Name string
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// activity-state of the device.
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ActivityState string
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// Number of active disks.
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DisksActive int64
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// Total number of disks the device consists of.
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DisksTotal int64
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// Number of blocks the device holds.
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BlocksTotal int64
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// Number of blocks on the device that are in sync.
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BlocksSynced int64
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}
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2020-01-29 14:16:38 +00:00
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// MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of
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// structs containing the relevant info. More information available here:
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// https://raid.wiki.kernel.org/index.php/Mdstat
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func (fs FS) MDStat() ([]MDStat, error) {
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data, err := ioutil.ReadFile(fs.proc.Path("mdstat"))
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2018-07-06 16:09:34 +00:00
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if err != nil {
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return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
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2018-07-06 16:09:34 +00:00
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}
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2020-01-29 14:16:38 +00:00
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mdstat, err := parseMDStat(data)
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if err != nil {
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return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
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}
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return mdstat, nil
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}
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2018-07-06 16:09:34 +00:00
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2020-01-29 14:16:38 +00:00
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// parseMDStat parses data from mdstat file (/proc/mdstat) and returns a slice of
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// structs containing the relevant info.
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func parseMDStat(mdstatData []byte) ([]MDStat, error) {
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mdStats := []MDStat{}
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lines := strings.Split(string(mdstatData), "\n")
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2018-07-06 16:09:34 +00:00
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for i, l := range lines {
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if strings.TrimSpace(l) == "" || l[0] == ' ' ||
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strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
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continue
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}
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deviceFields := strings.Fields(l)
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if len(deviceFields) < 3 {
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return nil, fmt.Errorf("not enough fields in mdline (expected at least 3): %s", l)
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}
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mdName := deviceFields[0]
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activityState := deviceFields[2]
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2018-07-06 16:09:34 +00:00
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if len(lines) <= i+3 {
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return mdStats, fmt.Errorf("missing lines for md device %s", mdName)
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2018-07-06 16:09:34 +00:00
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}
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active, total, size, err := evalStatusLine(lines[i+1])
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if err != nil {
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return nil, err
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2018-07-06 16:09:34 +00:00
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}
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2020-01-29 14:16:38 +00:00
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syncLineIdx := i + 2
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if strings.Contains(lines[i+2], "bitmap") { // skip bitmap line
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syncLineIdx++
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}
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2020-01-29 14:16:38 +00:00
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// If device is recovering/syncing at the moment, get the number of currently
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// synced bytes, otherwise that number equals the size of the device.
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syncedBlocks := size
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if strings.Contains(lines[syncLineIdx], "recovery") || strings.Contains(lines[syncLineIdx], "resync") {
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syncedBlocks, err = evalRecoveryLine(lines[syncLineIdx])
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2018-07-06 16:09:34 +00:00
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if err != nil {
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2020-01-29 14:16:38 +00:00
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return nil, err
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2018-07-06 16:09:34 +00:00
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}
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}
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2020-01-29 14:16:38 +00:00
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mdStats = append(mdStats, MDStat{
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Name: mdName,
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ActivityState: activityState,
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DisksActive: active,
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DisksTotal: total,
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BlocksTotal: size,
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BlocksSynced: syncedBlocks,
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})
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}
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2020-01-29 14:16:38 +00:00
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return mdStats, nil
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2018-07-06 16:09:34 +00:00
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}
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2020-01-29 14:16:38 +00:00
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func evalStatusLine(statusline string) (active, total, size int64, err error) {
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matches := statuslineRE.FindStringSubmatch(statusline)
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if len(matches) != 4 {
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return 0, 0, 0, fmt.Errorf("unexpected statusline: %s", statusline)
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}
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size, err = strconv.ParseInt(matches[1], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
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}
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total, err = strconv.ParseInt(matches[2], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
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}
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active, err = strconv.ParseInt(matches[3], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
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}
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return active, total, size, nil
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}
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func evalRecoveryLine(buildline string) (syncedBlocks int64, err error) {
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matches := buildlineRE.FindStringSubmatch(buildline)
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if len(matches) != 2 {
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return 0, fmt.Errorf("unexpected buildline: %s", buildline)
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}
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syncedBlocks, err = strconv.ParseInt(matches[1], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("%s in buildline: %s", err, buildline)
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}
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return syncedBlocks, nil
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}
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