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Merge pull request #509 from dswarbrick/mdraid-sysfs
Implement mdraid sysfs parsing
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// Copyright 2023 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. | ||
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//go:build linux | ||
// +build linux | ||
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package sysfs | ||
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import ( | ||
"fmt" | ||
"path/filepath" | ||
"strings" | ||
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"github.com/prometheus/procfs/internal/util" | ||
) | ||
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// Mdraid holds info parsed from relevant files in the /sys/block/md*/md directory. | ||
type Mdraid struct { | ||
Device string // Kernel device name of array. | ||
Level string // mdraid level. | ||
ArrayState string // State of the array. | ||
MetadataVersion string // mdraid metadata version. | ||
Disks uint64 // Number of devices in a fully functional array. | ||
Components []MdraidComponent // mdraid component devices. | ||
UUID string // UUID of the array. | ||
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// The following item is only valid for raid0, 4, 5, 6 and 10. | ||
ChunkSize uint64 // Chunk size | ||
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// The following items are only valid for raid1, 4, 5, 6 and 10. | ||
DegradedDisks uint64 // Number of degraded disks in the array. | ||
SyncAction string // Current sync action. | ||
SyncCompleted float64 // Fraction (0-1) representing the completion status of current sync operation. | ||
} | ||
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type MdraidComponent struct { | ||
Device string // Kernel device name. | ||
State string // Current state of device. | ||
} | ||
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// Mdraids gathers information and statistics about mdraid devices present. Based on upstream | ||
// kernel documentation https://docs.kernel.org/admin-guide/md.html. | ||
func (fs FS) Mdraids() ([]Mdraid, error) { | ||
matches, err := filepath.Glob(fs.sys.Path("block/md*/md")) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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mdraids := make([]Mdraid, 0) | ||
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for _, m := range matches { | ||
md := Mdraid{Device: filepath.Base(filepath.Dir(m))} | ||
path := fs.sys.Path("block", md.Device, "md") | ||
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if val, err := util.SysReadFile(filepath.Join(path, "level")); err == nil { | ||
md.Level = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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// Array state can be one of: clear, inactive, readonly, read-auto, clean, active, | ||
// write-pending, active-idle. | ||
if val, err := util.SysReadFile(filepath.Join(path, "array_state")); err == nil { | ||
md.ArrayState = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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if val, err := util.SysReadFile(filepath.Join(path, "metadata_version")); err == nil { | ||
md.MetadataVersion = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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if val, err := util.ReadUintFromFile(filepath.Join(path, "raid_disks")); err == nil { | ||
md.Disks = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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if val, err := util.SysReadFile(filepath.Join(path, "uuid")); err == nil { | ||
md.UUID = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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if devs, err := filepath.Glob(filepath.Join(path, "dev-*")); err == nil { | ||
for _, dev := range devs { | ||
comp := MdraidComponent{Device: strings.TrimPrefix(filepath.Base(dev), "dev-")} | ||
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// Component state can be a comma-separated list of: faulty, in_sync, writemostly, | ||
// blocked, spare, write_error, want_replacement, replacement. | ||
if val, err := util.SysReadFile(filepath.Join(dev, "state")); err == nil { | ||
comp.State = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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md.Components = append(md.Components, comp) | ||
} | ||
} else { | ||
return mdraids, err | ||
} | ||
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switch md.Level { | ||
case "raid0", "raid4", "raid5", "raid6", "raid10": | ||
if val, err := util.ReadUintFromFile(filepath.Join(path, "chunk_size")); err == nil { | ||
md.ChunkSize = val | ||
} else { | ||
return mdraids, err | ||
} | ||
} | ||
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switch md.Level { | ||
case "raid1", "raid4", "raid5", "raid6", "raid10": | ||
if val, err := util.ReadUintFromFile(filepath.Join(path, "degraded")); err == nil { | ||
md.DegradedDisks = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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// Array sync action can be one of: resync, recover, idle, check, repair. | ||
if val, err := util.SysReadFile(filepath.Join(path, "sync_action")); err == nil { | ||
md.SyncAction = val | ||
} else { | ||
return mdraids, err | ||
} | ||
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if val, err := util.SysReadFile(filepath.Join(path, "sync_completed")); err == nil { | ||
if val != "none" { | ||
var a, b uint64 | ||
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// File contains two values representing the fraction of number of completed | ||
// sectors divided by number of total sectors to process. | ||
if _, err := fmt.Sscanf(val, "%d / %d", &a, &b); err == nil { | ||
md.SyncCompleted = float64(a) / float64(b) | ||
} else { | ||
return mdraids, err | ||
} | ||
} | ||
} else { | ||
return mdraids, err | ||
} | ||
} | ||
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mdraids = append(mdraids, md) | ||
} | ||
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return mdraids, nil | ||
} |
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@@ -0,0 +1,134 @@ | ||
// Copyright 2023 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. | ||
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//go:build linux | ||
// +build linux | ||
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package sysfs | ||
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import ( | ||
"testing" | ||
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"github.com/google/go-cmp/cmp" | ||
) | ||
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func TestMdraidStats(t *testing.T) { | ||
fs, err := NewFS(sysTestFixtures) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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got, err := fs.Mdraids() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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want := []Mdraid{ | ||
{ | ||
Device: "md0", | ||
Level: "raid0", | ||
ArrayState: "clean", | ||
MetadataVersion: "1.2", | ||
Disks: 2, | ||
Components: []MdraidComponent{ | ||
{Device: "sdg", State: "in_sync"}, | ||
{Device: "sdh", State: "in_sync"}, | ||
}, | ||
UUID: "155f29ff-1716-4107-b362-52307ef86cac", | ||
ChunkSize: 524288, | ||
}, | ||
{ | ||
Device: "md1", | ||
Level: "raid1", | ||
ArrayState: "clean", | ||
MetadataVersion: "1.2", | ||
Disks: 2, | ||
Components: []MdraidComponent{ | ||
{Device: "sdi", State: "in_sync"}, | ||
{Device: "sdj", State: "in_sync"}, | ||
}, | ||
UUID: "0fbf5f2c-add2-43c2-bd78-a4be3ab709ef", | ||
SyncAction: "idle", | ||
}, | ||
{ | ||
Device: "md10", | ||
Level: "raid10", | ||
ArrayState: "clean", | ||
MetadataVersion: "1.2", | ||
Disks: 4, | ||
Components: []MdraidComponent{ | ||
{Device: "sdu", State: "in_sync"}, | ||
{Device: "sdv", State: "in_sync"}, | ||
{Device: "sdw", State: "in_sync"}, | ||
{Device: "sdx", State: "in_sync"}, | ||
}, | ||
UUID: "0c15f7e7-b159-4b1f-a5cd-a79b5c04b6f5", | ||
ChunkSize: 524288, | ||
SyncAction: "idle", | ||
}, | ||
{ | ||
Device: "md4", | ||
Level: "raid4", | ||
ArrayState: "clean", | ||
MetadataVersion: "1.2", | ||
Disks: 3, | ||
Components: []MdraidComponent{ | ||
{Device: "sdk", State: "in_sync"}, | ||
{Device: "sdl", State: "in_sync"}, | ||
{Device: "sdm", State: "in_sync"}, | ||
}, | ||
UUID: "67f415d5-2c0c-4b69-8e0d-7e20ef553457", | ||
ChunkSize: 524288, | ||
SyncAction: "idle", | ||
}, | ||
{ | ||
Device: "md5", | ||
Level: "raid5", | ||
ArrayState: "clean", | ||
MetadataVersion: "1.2", | ||
Disks: 3, | ||
Components: []MdraidComponent{ | ||
{Device: "sdaa", State: "spare"}, | ||
{Device: "sdn", State: "in_sync"}, | ||
{Device: "sdo", State: "in_sync"}, | ||
{Device: "sdp", State: "faulty"}, | ||
}, | ||
UUID: "7615b98d-f2ba-4d99-bee8-6202d8e130b9", | ||
ChunkSize: 524288, | ||
DegradedDisks: 1, | ||
SyncAction: "idle", | ||
}, | ||
{ | ||
Device: "md6", | ||
Level: "raid6", | ||
ArrayState: "active", | ||
MetadataVersion: "1.2", | ||
Disks: 4, | ||
Components: []MdraidComponent{ | ||
{Device: "sdq", State: "in_sync"}, | ||
{Device: "sdr", State: "in_sync"}, | ||
{Device: "sds", State: "in_sync"}, | ||
{Device: "sdt", State: "spare"}, | ||
}, | ||
UUID: "5f529b25-6efd-46e4-99a2-31f6f597be6b", | ||
ChunkSize: 524288, | ||
DegradedDisks: 1, | ||
SyncAction: "recover", | ||
SyncCompleted: 0.7500458659491194, | ||
}, | ||
} | ||
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if diff := cmp.Diff(want, got); diff != "" { | ||
t.Fatalf("unexpected Mdraid (-want +got):\n%s", diff) | ||
} | ||
} |
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