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mdstat: Collect raid component devices during parse
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This commit includes:
1. MDStat struct extention to hold raid component devices.
2. A util funciton that extracts raid component devices from
   /proc/mdstat info.
3. UTs adjustments.
4. codespell exceptions adjsutments - add to ignored list the
   word "hda" which appears in UTs as a compoent device.

Signed-off-by: Shimon Turjeman <shimon@lightbitslabs.com>
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@shimont-lb
shimont-lb committed Dec 20, 2020
1 parent 7b52fa5 commit a7abe04
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Showing 3 changed files with 41 additions and 21 deletions.
2 changes: 1 addition & 1 deletion .circleci/config.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@ jobs:
steps:
- checkout
- run: sudo pip install codespell
- run: codespell --skip=".git,./vendor,ttar,fixtures.ttar,./fixtures,go.mod,go.sum" -L uint,packages\',ded,alo,als,te,sie,hart
- run: codespell --skip=".git,./vendor,ttar,fixtures.ttar,./fixtures,go.mod,go.sum" -L uint,packages\',ded,alo,als,te,sie,hart,had

workflows:
version: 2
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23 changes: 21 additions & 2 deletions mdstat.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,9 @@ import (
)

var (
statusLineRE = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
recoveryLineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
statusLineRE = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
recoveryLineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
componentDeviceRE = regexp.MustCompile(`(.*)\[\d+\]`)
)

// MDStat holds info parsed from /proc/mdstat.
Expand All @@ -44,6 +45,8 @@ type MDStat struct {
BlocksTotal int64
// Number of blocks on the device that are in sync.
BlocksSynced int64
// Name of md component devices
Devices []string
}

// MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of
Expand Down Expand Up @@ -140,6 +143,7 @@ func parseMDStat(mdStatData []byte) ([]MDStat, error) {
DisksTotal: total,
BlocksTotal: size,
BlocksSynced: syncedBlocks,
Devices: evalComponentDevices(deviceFields),
})
}

Expand Down Expand Up @@ -195,3 +199,18 @@ func evalRecoveryLine(recoveryLine string) (syncedBlocks int64, err error) {

return syncedBlocks, nil
}

func evalComponentDevices(deviceFields []string) []string {
mdComponentDevices := make([]string, 0)
if len(deviceFields) > 3 {
for _, field := range deviceFields[4:] {
match := componentDeviceRE.FindStringSubmatch(field)
if match == nil {
continue
}
mdComponentDevices = append(mdComponentDevices, match[1])
}
}

return mdComponentDevices
}
37 changes: 19 additions & 18 deletions mdstat_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
package procfs

import "testing"
import "github.com/google/go-cmp/cmp"

func TestFS_MDStat(t *testing.T) {
fs := getProcFixtures(t)
Expand All @@ -24,30 +25,30 @@ func TestFS_MDStat(t *testing.T) {
}

refs := map[string]MDStat{
"md127": {Name: "md127", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 312319552, BlocksSynced: 312319552},
"md0": {Name: "md0", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 248896, BlocksSynced: 248896},
"md4": {Name: "md4", ActivityState: "inactive", DisksActive: 0, DisksTotal: 0, DisksFailed: 1, DisksSpare: 1, BlocksTotal: 4883648, BlocksSynced: 4883648},
"md6": {Name: "md6", ActivityState: "recovering", DisksActive: 1, DisksTotal: 2, DisksFailed: 1, DisksSpare: 1, BlocksTotal: 195310144, BlocksSynced: 16775552},
"md3": {Name: "md3", ActivityState: "active", DisksActive: 8, DisksTotal: 8, DisksFailed: 0, DisksSpare: 2, BlocksTotal: 5853468288, BlocksSynced: 5853468288},
"md8": {Name: "md8", ActivityState: "resyncing", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 2, BlocksTotal: 195310144, BlocksSynced: 16775552},
"md7": {Name: "md7", ActivityState: "active", DisksActive: 3, DisksTotal: 4, DisksFailed: 1, DisksSpare: 0, BlocksTotal: 7813735424, BlocksSynced: 7813735424},
"md9": {Name: "md9", ActivityState: "resyncing", DisksActive: 4, DisksTotal: 4, DisksSpare: 1, DisksFailed: 2, BlocksTotal: 523968, BlocksSynced: 0},
"md10": {Name: "md10", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 314159265, BlocksSynced: 314159265},
"md11": {Name: "md11", ActivityState: "resyncing", DisksActive: 2, DisksTotal: 2, DisksFailed: 1, DisksSpare: 2, BlocksTotal: 4190208, BlocksSynced: 0},
"md12": {Name: "md12", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksSpare: 0, DisksFailed: 0, BlocksTotal: 3886394368, BlocksSynced: 3886394368},
"md120": {Name: "md120", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 2095104, BlocksSynced: 2095104},
"md126": {Name: "md126", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 1855870976, BlocksSynced: 1855870976},
"md219": {Name: "md219", ActivityState: "inactive", DisksTotal: 0, DisksFailed: 0, DisksActive: 0, DisksSpare: 3, BlocksTotal: 7932, BlocksSynced: 7932},
"md00": {Name: "md00", ActivityState: "active", DisksActive: 1, DisksTotal: 1, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 4186624, BlocksSynced: 4186624},
"md101": {Name: "md101", ActivityState: "active", DisksActive: 3, DisksTotal: 3, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 322560, BlocksSynced: 322560},
"md201": {Name: "md201", ActivityState: "checking", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 1993728, BlocksSynced: 114176},
"md127": {Name: "md127", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 312319552, BlocksSynced: 312319552, Devices: []string{"sdi2", "sdj2"}},
"md0": {Name: "md0", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 248896, BlocksSynced: 248896, Devices: []string{"sdi1", "sdj1"}},
"md4": {Name: "md4", ActivityState: "inactive", DisksActive: 0, DisksTotal: 0, DisksFailed: 1, DisksSpare: 1, BlocksTotal: 4883648, BlocksSynced: 4883648, Devices: []string{"sda3", "sdb3"}},
"md6": {Name: "md6", ActivityState: "recovering", DisksActive: 1, DisksTotal: 2, DisksFailed: 1, DisksSpare: 1, BlocksTotal: 195310144, BlocksSynced: 16775552, Devices: []string{"sdb2", "sdc", "sda2"}},
"md3": {Name: "md3", ActivityState: "active", DisksActive: 8, DisksTotal: 8, DisksFailed: 0, DisksSpare: 2, BlocksTotal: 5853468288, BlocksSynced: 5853468288, Devices: []string{"sda1", "sdh1", "sdg1", "sdf1", "sde1", "sdd1", "sdc1", "sdb1", "sdd1", "sdd2"}},
"md8": {Name: "md8", ActivityState: "resyncing", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 2, BlocksTotal: 195310144, BlocksSynced: 16775552, Devices: []string{"sdb1", "sda1", "sdc", "sde"}},
"md7": {Name: "md7", ActivityState: "active", DisksActive: 3, DisksTotal: 4, DisksFailed: 1, DisksSpare: 0, BlocksTotal: 7813735424, BlocksSynced: 7813735424, Devices: []string{"sdb1", "sde1", "sdd1", "sdc1"}},
"md9": {Name: "md9", ActivityState: "resyncing", DisksActive: 4, DisksTotal: 4, DisksSpare: 1, DisksFailed: 2, BlocksTotal: 523968, BlocksSynced: 0, Devices: []string{"sdc2", "sdd2", "sdb2", "sda2", "sde", "sdf", "sdg"}},
"md10": {Name: "md10", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 314159265, BlocksSynced: 314159265, Devices: []string{"sda1", "sdb1"}},
"md11": {Name: "md11", ActivityState: "resyncing", DisksActive: 2, DisksTotal: 2, DisksFailed: 1, DisksSpare: 2, BlocksTotal: 4190208, BlocksSynced: 0, Devices: []string{"sdb2", "sdc2", "sdc3", "hda", "ssdc2"}},
"md12": {Name: "md12", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksSpare: 0, DisksFailed: 0, BlocksTotal: 3886394368, BlocksSynced: 3886394368, Devices: []string{"sdc2", "sdd2"}},
"md120": {Name: "md120", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 2095104, BlocksSynced: 2095104, Devices: []string{"sda1", "sdb1"}},
"md126": {Name: "md126", ActivityState: "active", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 1855870976, BlocksSynced: 1855870976, Devices: []string{"sdb", "sdc"}},
"md219": {Name: "md219", ActivityState: "inactive", DisksTotal: 0, DisksFailed: 0, DisksActive: 0, DisksSpare: 3, BlocksTotal: 7932, BlocksSynced: 7932, Devices: []string{"sdc", "sda"}},
"md00": {Name: "md00", ActivityState: "active", DisksActive: 1, DisksTotal: 1, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 4186624, BlocksSynced: 4186624, Devices: []string{"xvdb"}},
"md101": {Name: "md101", ActivityState: "active", DisksActive: 3, DisksTotal: 3, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 322560, BlocksSynced: 322560, Devices: []string{"sdb", "sdd", "sdc"}},
"md201": {Name: "md201", ActivityState: "checking", DisksActive: 2, DisksTotal: 2, DisksFailed: 0, DisksSpare: 0, BlocksTotal: 1993728, BlocksSynced: 114176, Devices: []string{"sda3", "sdb3"}},
}

if want, have := len(refs), len(mdStats); want != have {
t.Errorf("want %d parsed md-devices, have %d", want, have)
}
for _, md := range mdStats {
if want, have := refs[md.Name], md; want != have {
if want, have := refs[md.Name], md; !cmp.Equal(want, have) {
t.Errorf("%s: want %v, have %v", md.Name, want, have)
}
}
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