diff --git a/btrfs/btrfs.go b/btrfs/btrfs.go new file mode 100644 index 000000000..094c898aa --- /dev/null +++ b/btrfs/btrfs.go @@ -0,0 +1,67 @@ +// Copyright 2019 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. + +// Package btrfs provides access to statistics exposed by Btrfs filesystems. +package btrfs + +// Stats contains statistics for a single Btrfs filesystem. +// See Linux fs/btrfs/sysfs.c for more information. +type Stats struct { + UUID, Label string + Allocation Allocation + Devices map[string]*Device + Features []string + CloneAlignment uint64 + NodeSize uint64 + QuotaOverride uint64 + SectorSize uint64 +} + +// Allocation contains allocation statistics for data, metadata and system data. +type Allocation struct { + GlobalRsvReserved, GlobalRsvSize uint64 + Data, Metadata, System *AllocationStats +} + +// AllocationStats contains allocation statistics for a data type. +type AllocationStats struct { + // Usage statistics + DiskUsedBytes uint64 + DiskTotalBytes uint64 + MayUseBytes uint64 + PinnedBytes uint64 + TotalPinnedBytes uint64 + ReadOnlyBytes uint64 + ReservedBytes uint64 + UsedBytes uint64 + TotalBytes uint64 + + // Flags marking filesystem state + // See Linux fs/btrfs/ctree.h for more information. + Flags uint64 + + // Additional disk usage statistics depending on the disk layout. + // At least one of these will exist and not be nil. + Layouts map[string]*LayoutUsage +} + +// LayoutUsage contains additional usage statistics for a disk layout. +type LayoutUsage struct { + UsedBytes, TotalBytes uint64 + Ratio float64 +} + +// Device contains information about a device that is part of a Btrfs filesystem. +type Device struct { + Size uint64 +} diff --git a/btrfs/get.go b/btrfs/get.go new file mode 100644 index 000000000..fa70daa51 --- /dev/null +++ b/btrfs/get.go @@ -0,0 +1,251 @@ +// Copyright 2019 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. + +package btrfs + +import ( + "io/ioutil" + "os" + "path" + "path/filepath" + "strconv" + "strings" + + "github.com/prometheus/procfs/internal/fs" + "github.com/prometheus/procfs/internal/util" +) + +// SectorSize contains the Linux sector size. +// > Linux always considers sectors to be 512 bytes long independently +// > of the devices real block size. +const SectorSize = 512 + +// FS represents the pseudo-filesystem sys, which provides an interface to +// kernel data structures. +type FS struct { + sys *fs.FS +} + +// NewDefaultFS returns a new Bcache using the default sys fs mount point. It will error +// if the mount point can't be read. +func NewDefaultFS() (FS, error) { + return NewFS(fs.DefaultSysMountPoint) +} + +// NewFS returns a new Btrfs filesystem using the given sys fs mount point. It will error +// if the mount point can't be read. +func NewFS(mountPoint string) (FS, error) { + if strings.TrimSpace(mountPoint) == "" { + mountPoint = fs.DefaultSysMountPoint + } + sys, err := fs.NewFS(mountPoint) + if err != nil { + return FS{}, err + } + return FS{&sys}, nil +} + +// Stats retrieves Btrfs filesystem runtime statistics for each mounted Btrfs filesystem. +func (fs FS) Stats() ([]*Stats, error) { + matches, err := filepath.Glob(fs.sys.Path("fs/btrfs/*-*")) + if err != nil { + return nil, err + } + + stats := make([]*Stats, 0, len(matches)) + for _, uuidPath := range matches { + s, err := GetStats(uuidPath) + if err != nil { + return nil, err + } + + // Set the UUID from the path when it could not be retrieved from the filesystem. + if s.UUID == "" { + s.UUID = filepath.Base(uuidPath) + } + + stats = append(stats, s) + } + + return stats, nil +} + +// GetStats collects all Btrfs statistics from sysfs +func GetStats(uuidPath string) (*Stats, error) { + r := &reader{path: uuidPath} + s := r.readFilesystemStats() + if r.err != nil { + return nil, r.err + } + + return s, nil +} + +type reader struct { + path string + err error + devCount int +} + +// readFile reads a file relative to the path of the reader. +// Non-existing files are ignored. +func (r *reader) readFile(n string) string { + b, err := util.SysReadFile(path.Join(r.path, n)) + if err != nil && !os.IsNotExist(err) { + r.err = err + } + return strings.TrimSpace(string(b)) +} + +// readValues reads a number of numerical values into an uint64 slice. +func (r *reader) readValue(n string) (v uint64) { + // Read value from file + s := r.readFile(n) + if r.err != nil { + return + } + + // Convert number + v, _ = strconv.ParseUint(s, 10, 64) + return +} + +// listFiles returns a list of files for a directory of the reader. +func (r *reader) listFiles(p string) []string { + files, err := ioutil.ReadDir(path.Join(r.path, p)) + if err != nil { + r.err = err + return nil + } + + names := make([]string, len(files)) + for i, f := range files { + names[i] = f.Name() + } + return names +} + +// readAllocationStats reads Btrfs allocation data for the current path. +func (r *reader) readAllocationStats(d string) (a *AllocationStats) { + // Create a reader for this subdirectory + sr := &reader{path: path.Join(r.path, d), devCount: r.devCount} + + // Get the stats + a = &AllocationStats{ + // Read basic allocation stats + MayUseBytes: sr.readValue("bytes_may_use"), + PinnedBytes: sr.readValue("bytes_pinned"), + ReadOnlyBytes: sr.readValue("bytes_readonly"), + ReservedBytes: sr.readValue("bytes_reserved"), + UsedBytes: sr.readValue("bytes_used"), + DiskUsedBytes: sr.readValue("disk_used"), + DiskTotalBytes: sr.readValue("disk_total"), + Flags: sr.readValue("flags"), + TotalBytes: sr.readValue("total_bytes"), + TotalPinnedBytes: sr.readValue("total_bytes_pinned"), + Layouts: sr.readLayouts(), + } + + // Pass any error back + r.err = sr.err + + return +} + +// readLayouts reads all Btrfs layout statistics for the current path +func (r *reader) readLayouts() map[string]*LayoutUsage { + files, err := ioutil.ReadDir(r.path) + if err != nil { + r.err = err + return nil + } + + m := make(map[string]*LayoutUsage) + for _, f := range files { + if f.IsDir() { + m[f.Name()] = r.readLayout(f.Name()) + } + } + + return m +} + +// readLayout reads the Btrfs layout statistics for an allocation layout. +func (r *reader) readLayout(p string) (l *LayoutUsage) { + l = new(LayoutUsage) + l.TotalBytes = r.readValue(path.Join(p, "total_bytes")) + l.UsedBytes = r.readValue(path.Join(p, "used_bytes")) + l.Ratio = r.calcRatio(p) + + return +} + +// calcRatio returns the calculated ratio for a layout mode. +func (r *reader) calcRatio(p string) float64 { + switch p { + case "single", "raid0": + return 1 + case "dup", "raid1", "raid10": + return 2 + case "raid5": + return float64(r.devCount) / (float64(r.devCount) - 1) + case "raid6": + return float64(r.devCount) / (float64(r.devCount) - 2) + default: + return 0 + } +} + +// readDeviceInfo returns the information for all devices associated with this filesystem. +func (r *reader) readDeviceInfo(d string) map[string]*Device { + devs := r.listFiles("devices") + info := make(map[string]*Device, len(devs)) + for _, n := range devs { + info[n] = &Device{ + Size: SectorSize * r.readValue("devices/"+n+"/size"), + } + } + + return info +} + +// readFilesystemStats reads Btrfs statistics for a filesystem. +func (r *reader) readFilesystemStats() (s *Stats) { + // First get disk info, and add it to reader + devices := r.readDeviceInfo("devices") + r.devCount = len(devices) + + s = &Stats{ + // Read basic filesystem information + Label: r.readFile("label"), + UUID: r.readFile("metadata_uuid"), + Features: r.listFiles("features"), + CloneAlignment: r.readValue("clone_alignment"), + NodeSize: r.readValue("nodesize"), + QuotaOverride: r.readValue("quota_override"), + SectorSize: r.readValue("sectorsize"), + + // Device info + Devices: devices, + + // Read allocation data + Allocation: Allocation{ + GlobalRsvReserved: r.readValue("allocation/global_rsv_reserved"), + GlobalRsvSize: r.readValue("allocation/global_rsv_size"), + Data: r.readAllocationStats("allocation/data"), + Metadata: r.readAllocationStats("allocation/metadata"), + System: r.readAllocationStats("allocation/system"), + }, + } + return +} diff --git a/btrfs/get_test.go b/btrfs/get_test.go new file mode 100644 index 000000000..224123f4e --- /dev/null +++ b/btrfs/get_test.go @@ -0,0 +1,102 @@ +// Copyright 2019 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. + +package btrfs + +import "testing" + +type testVector struct { + uuid, label string + devices, features int + data, meta, system alloc +} + +type alloc struct { + layout string + size uint64 + ratio float64 +} + +func TestFSBtrfsStats(t *testing.T) { + btrfs, err := NewFS("../fixtures/sys") + if err != nil { + t.Fatalf("failed to access Btrfs filesystem: %v", err) + } + stats, err := btrfs.Stats() + if err != nil { + t.Fatalf("failed to parse Btrfs stats: %v", err) + } + + tests := []testVector{ + { + uuid: "0abb23a9-579b-43e6-ad30-227ef47fcb9d", + label: "fixture", + devices: 2, + features: 4, + data: alloc{"raid0", 2147483648, 1}, + meta: alloc{"raid1", 1073741824, 2}, + system: alloc{"raid1", 8388608, 2}, + }, + { + uuid: "7f07c59f-6136-449c-ab87-e1cf2328731b", + label: "", + devices: 4, + features: 5, + data: alloc{"raid5", 644087808, 4. / 3.}, + meta: alloc{"raid6", 429391872, 4. / 2.}, + system: alloc{"raid6", 16777216, 4. / 2.}, + }, + } + + if l := len(stats); l != len(tests) { + t.Fatalf("unexpected number of btrfs stats: %d", l) + } + + for i, tt := range tests { + if want, got := tt.uuid, stats[i].UUID; want != got { + t.Errorf("fs %q unexpected stats name:\nwant: %q\nhave: %q", tt.uuid, want, got) + } + + if want, got := tt.devices, len(stats[i].Devices); want != got { + t.Errorf("fs %q unexpected number of devices:\nwant: %d\nhave: %d", tt.uuid, want, got) + } + + if want, got := tt.features, len(stats[i].Features); want != got { + t.Errorf("fs %q unexpected number of features:\nwant: %d\nhave: %d", tt.uuid, want, got) + } + + if want, got := tt.data.size, stats[i].Allocation.Data.TotalBytes; want != got { + t.Errorf("fs %q unexpected data size:\nwant: %d\nhave: %d", tt.uuid, want, got) + } + + if want, got := tt.meta.size, stats[i].Allocation.Metadata.TotalBytes; want != got { + t.Errorf("fs %q unexpected metadata size:\nwant: %d\nhave: %d", tt.uuid, want, got) + } + + if want, got := tt.system.size, stats[i].Allocation.System.TotalBytes; want != got { + t.Errorf("fs %q unexpected system size:\nwant: %d\nhave: %d", tt.uuid, want, got) + } + + if want, got := tt.data.ratio, stats[i].Allocation.Data.Layouts[tt.data.layout].Ratio; want != got { + t.Errorf("fs %q unexpected data ratio:\nwant: %f\nhave: %f", tt.uuid, want, got) + } + + if want, got := tt.meta.ratio, stats[i].Allocation.Metadata.Layouts[tt.meta.layout].Ratio; want != got { + t.Errorf("fs %q unexpected metadata ratio:\nwant: %f\nhave: %f", tt.uuid, want, got) + } + + if want, got := tt.system.ratio, stats[i].Allocation.System.Layouts[tt.system.layout].Ratio; want != got { + t.Errorf("fs %q unexpected system ratio:\nwant: %f\nhave: %f", tt.uuid, want, got) + } + } +} diff --git a/fixtures.ttar b/fixtures.ttar index 0b2905544..a132eefc9 100644 --- a/fixtures.ttar +++ b/fixtures.ttar @@ -4278,6 +4278,581 @@ Lines: 1 0 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