diff --git a/CHANGELOG.md b/CHANGELOG.md index 19d3cfff..e04c9ad0 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -23,6 +23,7 @@ * [FEATURE] Add new cooling_device metrics to thermal zone collector #1445 * [FEATURE] Add new softnet collector #1576 * [FEATURE] Add RAPL collector #1523 +* [FEATURE] Add Btrfs collector #1512 * [ENHANCEMENT] Collect InfiniBand port state and physical state #1357 * [ENHANCEMENT] Include additional XFS runtime statistics. #1423 * [ENHANCEMENT] Report non-fatal collection errors in the exporter metric. #1439 diff --git a/collector/btrfs_linux.go b/collector/btrfs_linux.go new file mode 100644 index 00000000..2336e655 --- /dev/null +++ b/collector/btrfs_linux.go @@ -0,0 +1,189 @@ +// 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. + +// +build !nobtrfs + +package collector + +import ( + "fmt" + + "github.com/go-kit/kit/log" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/procfs/btrfs" +) + +// A btrfsCollector is a Collector which gathers metrics from Btrfs filesystems. +type btrfsCollector struct { + fs btrfs.FS + logger log.Logger +} + +func init() { + registerCollector("btrfs", defaultEnabled, NewBtrfsCollector) +} + +// NewBtrfsCollector returns a new Collector exposing Btrfs statistics. +func NewBtrfsCollector(logger log.Logger) (Collector, error) { + fs, err := btrfs.NewFS(*sysPath) + if err != nil { + return nil, fmt.Errorf("failed to open sysfs: %v", err) + } + + return &btrfsCollector{ + fs: fs, + logger: logger, + }, nil +} + +// Update retrieves and exports Btrfs statistics. +// It implements Collector. +func (c *btrfsCollector) Update(ch chan<- prometheus.Metric) error { + stats, err := c.fs.Stats() + if err != nil { + return fmt.Errorf("failed to retrieve Btrfs stats: %v", err) + } + + for _, s := range stats { + c.updateBtrfsStats(ch, s) + } + + return nil +} + +// btrfsMetric represents a single Btrfs metric that is converted into a Prometheus Metric. +type btrfsMetric struct { + name string + desc string + value float64 + extraLabel []string + extraLabelValue []string +} + +// updateBtrfsStats collects statistics for one bcache ID. +func (c *btrfsCollector) updateBtrfsStats(ch chan<- prometheus.Metric, s *btrfs.Stats) { + const subsystem = "btrfs" + + // Basic information about the filesystem. + devLabels := []string{"uuid"} + + // Retrieve the metrics. + metrics := c.getMetrics(s) + + // Convert all gathered metrics to Prometheus Metrics and add to channel. + for _, m := range metrics { + labels := append(devLabels, m.extraLabel...) + + desc := prometheus.NewDesc( + prometheus.BuildFQName(namespace, subsystem, m.name), + m.desc, + labels, + nil, + ) + + labelValues := []string{s.UUID} + if len(m.extraLabelValue) > 0 { + labelValues = append(labelValues, m.extraLabelValue...) + } + + ch <- prometheus.MustNewConstMetric( + desc, + prometheus.GaugeValue, + m.value, + labelValues..., + ) + } +} + +// getMetrics returns metrics for the given Btrfs statistics. +func (c *btrfsCollector) getMetrics(s *btrfs.Stats) []btrfsMetric { + metrics := []btrfsMetric{ + { + name: "info", + desc: "Filesystem information", + value: 1, + extraLabel: []string{"label"}, + extraLabelValue: []string{s.Label}, + }, + { + name: "global_rsv_size_bytes", + desc: "Size of global reserve.", + value: float64(s.Allocation.GlobalRsvSize), + }, + } + + // Information about devices. + for n, dev := range s.Devices { + metrics = append(metrics, btrfsMetric{ + name: "device_size_bytes", + desc: "Size of a device that is part of the filesystem.", + value: float64(dev.Size), + extraLabel: []string{"device"}, + extraLabelValue: []string{n}, + }) + } + + // Information about data, metadata and system data. + metrics = append(metrics, c.getAllocationStats("data", s.Allocation.Data)...) + metrics = append(metrics, c.getAllocationStats("metadata", s.Allocation.Metadata)...) + metrics = append(metrics, c.getAllocationStats("system", s.Allocation.System)...) + + return metrics +} + +// getAllocationStats returns allocation metrics for the given Btrfs Allocation statistics. +func (c *btrfsCollector) getAllocationStats(a string, s *btrfs.AllocationStats) []btrfsMetric { + metrics := []btrfsMetric{ + { + name: "reserved_bytes", + desc: "Amount of space reserved for a data type", + value: float64(s.ReservedBytes), + extraLabel: []string{"block_group_type"}, + extraLabelValue: []string{a}, + }, + } + + // Add all layout statistics. + for layout, stats := range s.Layouts { + metrics = append(metrics, c.getLayoutStats(a, layout, stats)...) + } + + return metrics +} + +// getLayoutStats returns metrics for a data layout. +func (c *btrfsCollector) getLayoutStats(a, l string, s *btrfs.LayoutUsage) []btrfsMetric { + return []btrfsMetric{ + { + name: "used_bytes", + desc: "Amount of used space by a layout/data type", + value: float64(s.UsedBytes), + extraLabel: []string{"block_group_type", "mode"}, + extraLabelValue: []string{a, l}, + }, + { + name: "size_bytes", + desc: "Amount of space allocated for a layout/data type", + value: float64(s.TotalBytes), + extraLabel: []string{"block_group_type", "mode"}, + extraLabelValue: []string{a, l}, + }, + { + name: "allocation_ratio", + desc: "Data allocation ratio for a layout/data type", + value: s.Ratio, + extraLabel: []string{"block_group_type", "mode"}, + extraLabelValue: []string{a, l}, + }, + } +} diff --git a/collector/btrfs_linux_test.go b/collector/btrfs_linux_test.go new file mode 100644 index 00000000..9db74196 --- /dev/null +++ b/collector/btrfs_linux_test.go @@ -0,0 +1,118 @@ +// 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. + +// +build !nobtrfs + +package collector + +import ( + "strings" + "testing" + + "github.com/prometheus/procfs/btrfs" +) + +var expectedBtrfsMetrics = [][]btrfsMetric{ + { + {name: "info", value: 1, extraLabel: []string{"label"}, extraLabelValue: []string{"fixture"}}, + {name: "global_rsv_size_bytes", value: 1.6777216e+07}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop25"}}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop26"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"data"}}, + {name: "used_bytes", value: 8.08189952e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}}, + {name: "size_bytes", value: 2.147483648e+09, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}}, + {name: "allocation_ratio", value: 1, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"metadata"}}, + {name: "used_bytes", value: 933888, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}}, + {name: "size_bytes", value: 1.073741824e+09, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}}, + {name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"system"}}, + {name: "used_bytes", value: 16384, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}}, + {name: "size_bytes", value: 8.388608e+06, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}}, + {name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}}, + }, + { + {name: "info", value: 1, extraLabel: []string{"label"}, extraLabelValue: []string{""}}, + {name: "global_rsv_size_bytes", value: 1.6777216e+07}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop22"}}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop23"}}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop24"}}, + {name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop25"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"data"}}, + {name: "used_bytes", value: 0, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}}, + {name: "size_bytes", value: 6.44087808e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}}, + {name: "allocation_ratio", value: 1.3333333333333333, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"metadata"}}, + {name: "used_bytes", value: 114688, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}}, + {name: "size_bytes", value: 4.29391872e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}}, + {name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}}, + {name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"system"}}, + {name: "used_bytes", value: 16384, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}}, + {name: "size_bytes", value: 1.6777216e+07, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}}, + {name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}}, + }, +} + +func checkMetric(exp, got *btrfsMetric) bool { + if exp.name != got.name || + exp.value != got.value || + len(exp.extraLabel) != len(got.extraLabel) || + len(exp.extraLabelValue) != len(got.extraLabelValue) { + return false + } + + for i := range exp.extraLabel { + if exp.extraLabel[i] != got.extraLabel[i] { + return false + } + + // Devices (loopXX) can appear in random order, so just check the first 4 characters. + if strings.HasPrefix(got.extraLabelValue[i], "loop") && + exp.extraLabelValue[i][:4] == got.extraLabelValue[i][:4] { + continue + } + + if exp.extraLabelValue[i] != got.extraLabelValue[i] { + return false + } + } + + return true +} + +func TestBtrfs(t *testing.T) { + fs, _ := btrfs.NewFS("fixtures/sys") + collector := &btrfsCollector{fs: fs} + + stats, err := collector.fs.Stats() + if err != nil { + t.Fatalf("Failed to retrieve Btrfs stats: %v", err) + } + if len(stats) != len(expectedBtrfsMetrics) { + t.Fatalf("Unexpected number of Btrfs stats: expected %v, got %v", len(expectedBtrfsMetrics), len(stats)) + } + + for i, s := range stats { + metrics := collector.getMetrics(s) + if len(metrics) != len(expectedBtrfsMetrics[i]) { + t.Fatalf("Unexpected number of Btrfs metrics: expected %v, got %v", len(expectedBtrfsMetrics[i]), len(metrics)) + } + + for j, m := range metrics { + exp := expectedBtrfsMetrics[i][j] + if !checkMetric(&exp, &m) { + t.Errorf("Incorrect btrfs metric: expected %#v, got: %#v", exp, m) + } + } + } +} diff --git a/collector/fixtures/e2e-output.txt b/collector/fixtures/e2e-output.txt index e34bf569..ddc048f6 100644 --- a/collector/fixtures/e2e-output.txt +++ b/collector/fixtures/e2e-output.txt @@ -140,6 +140,54 @@ node_bonding_slaves{master="int"} 2 # HELP node_boot_time_seconds Node boot time, in unixtime. # TYPE node_boot_time_seconds gauge node_boot_time_seconds 1.418183276e+09 +# HELP node_btrfs_allocation_ratio Data allocation ratio for a layout/data type +# TYPE node_btrfs_allocation_ratio gauge +node_btrfs_allocation_ratio{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1 +node_btrfs_allocation_ratio{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.3333333333333333 +node_btrfs_allocation_ratio{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2 +node_btrfs_allocation_ratio{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 2 +node_btrfs_allocation_ratio{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2 +node_btrfs_allocation_ratio{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 2 +# HELP node_btrfs_device_size_bytes Size of a device that is part of the filesystem. +# TYPE node_btrfs_device_size_bytes gauge +node_btrfs_device_size_bytes{device="loop22",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10 +node_btrfs_device_size_bytes{device="loop23",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10 +node_btrfs_device_size_bytes{device="loop24",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10 +node_btrfs_device_size_bytes{device="loop25",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+10 +node_btrfs_device_size_bytes{device="loop25",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10 +node_btrfs_device_size_bytes{device="loop26",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+10 +# HELP node_btrfs_global_rsv_size_bytes Size of global reserve. +# TYPE node_btrfs_global_rsv_size_bytes gauge +node_btrfs_global_rsv_size_bytes{uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.6777216e+07 +node_btrfs_global_rsv_size_bytes{uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.6777216e+07 +# HELP node_btrfs_info Filesystem information +# TYPE node_btrfs_info gauge +node_btrfs_info{label="",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1 +node_btrfs_info{label="fixture",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1 +# HELP node_btrfs_reserved_bytes Amount of space reserved for a data type +# TYPE node_btrfs_reserved_bytes gauge +node_btrfs_reserved_bytes{block_group_type="data",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0 +node_btrfs_reserved_bytes{block_group_type="data",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0 +node_btrfs_reserved_bytes{block_group_type="metadata",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0 +node_btrfs_reserved_bytes{block_group_type="metadata",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0 +node_btrfs_reserved_bytes{block_group_type="system",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0 +node_btrfs_reserved_bytes{block_group_type="system",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0 +# HELP node_btrfs_size_bytes Amount of space allocated for a layout/data type +# TYPE node_btrfs_size_bytes gauge +node_btrfs_size_bytes{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2.147483648e+09 +node_btrfs_size_bytes{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 6.44087808e+08 +node_btrfs_size_bytes{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+09 +node_btrfs_size_bytes{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 4.29391872e+08 +node_btrfs_size_bytes{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 8.388608e+06 +node_btrfs_size_bytes{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.6777216e+07 +# HELP node_btrfs_used_bytes Amount of used space by a layout/data type +# TYPE node_btrfs_used_bytes gauge +node_btrfs_used_bytes{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 8.08189952e+08 +node_btrfs_used_bytes{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0 +node_btrfs_used_bytes{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 933888 +node_btrfs_used_bytes{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 114688 +node_btrfs_used_bytes{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 16384 +node_btrfs_used_bytes{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 16384 # HELP node_buddyinfo_blocks Count of free blocks according to size. # TYPE node_buddyinfo_blocks gauge node_buddyinfo_blocks{node="0",size="0",zone="DMA"} 1 @@ -2560,6 +2608,7 @@ node_schedstat_waiting_seconds_total{cpu="1"} 364107.263788241 node_scrape_collector_success{collector="arp"} 1 node_scrape_collector_success{collector="bcache"} 1 node_scrape_collector_success{collector="bonding"} 1 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b/vendor/github.com/prometheus/procfs/btrfs/btrfs.go new file mode 100644 index 00000000..094c898a --- /dev/null +++ b/vendor/github.com/prometheus/procfs/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/vendor/github.com/prometheus/procfs/btrfs/get.go b/vendor/github.com/prometheus/procfs/btrfs/get.go new file mode 100644 index 00000000..fa70daa5 --- /dev/null +++ b/vendor/github.com/prometheus/procfs/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/vendor/modules.txt b/vendor/modules.txt index ae4fb575..9b77b1a8 100644 --- a/vendor/modules.txt +++ b/vendor/modules.txt @@ -62,6 +62,7 @@ github.com/prometheus/common/version # github.com/prometheus/procfs v0.0.10 github.com/prometheus/procfs github.com/prometheus/procfs/bcache +github.com/prometheus/procfs/btrfs github.com/prometheus/procfs/internal/fs github.com/prometheus/procfs/internal/util github.com/prometheus/procfs/nfs