|
| 1 | +// Copyright 2019 The Prometheus Authors |
| 2 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 3 | +// you may not use this file except in compliance with the License. |
| 4 | +// You may obtain a copy of the License at |
| 5 | +// |
| 6 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +// |
| 8 | +// Unless required by applicable law or agreed to in writing, software |
| 9 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | +// See the License for the specific language governing permissions and |
| 12 | +// limitations under the License. |
| 13 | + |
| 14 | +// Package btrfs provides access to statistics exposed by ext4 filesystems. |
| 15 | +package ext4 |
| 16 | + |
| 17 | +import ( |
| 18 | + "path/filepath" |
| 19 | + "strings" |
| 20 | + |
| 21 | + "github.com/prometheus/procfs/internal/fs" |
| 22 | + "github.com/prometheus/procfs/internal/util" |
| 23 | +) |
| 24 | + |
| 25 | +const ( |
| 26 | + sysFSPath = "fs" |
| 27 | + sysFSExt4Path = "ext4" |
| 28 | +) |
| 29 | + |
| 30 | +// Stats contains statistics for a single Btrfs filesystem. |
| 31 | +// See Linux fs/btrfs/sysfs.c for more information. |
| 32 | +type Stats struct { |
| 33 | + Name string |
| 34 | + |
| 35 | + Errors uint64 |
| 36 | + Warnings uint64 |
| 37 | + Messages uint64 |
| 38 | +} |
| 39 | + |
| 40 | +// FS represents the pseudo-filesystems proc and sys, which provides an |
| 41 | +// interface to kernel data structures. |
| 42 | +type FS struct { |
| 43 | + proc *fs.FS |
| 44 | + sys *fs.FS |
| 45 | +} |
| 46 | + |
| 47 | +// NewDefaultFS returns a new blockdevice fs using the default mountPoints for proc and sys. |
| 48 | +// It will error if either of these mount points can't be read. |
| 49 | +func NewDefaultFS() (FS, error) { |
| 50 | + return NewFS(fs.DefaultProcMountPoint, fs.DefaultSysMountPoint) |
| 51 | +} |
| 52 | + |
| 53 | +// NewFS returns a new XFS handle using the given proc and sys mountPoints. It will error |
| 54 | +// if either of the mounts point can't be read. |
| 55 | +func NewFS(procMountPoint string, sysMountPoint string) (FS, error) { |
| 56 | + if strings.TrimSpace(procMountPoint) == "" { |
| 57 | + procMountPoint = fs.DefaultProcMountPoint |
| 58 | + } |
| 59 | + procfs, err := fs.NewFS(procMountPoint) |
| 60 | + if err != nil { |
| 61 | + return FS{}, err |
| 62 | + } |
| 63 | + if strings.TrimSpace(sysMountPoint) == "" { |
| 64 | + sysMountPoint = fs.DefaultSysMountPoint |
| 65 | + } |
| 66 | + sysfs, err := fs.NewFS(sysMountPoint) |
| 67 | + if err != nil { |
| 68 | + return FS{}, err |
| 69 | + } |
| 70 | + return FS{&procfs, &sysfs}, nil |
| 71 | +} |
| 72 | + |
| 73 | +// ProcStat returns stats for the filesystem. |
| 74 | +func (fs FS) ProcStat() ([]*Stats, error) { |
| 75 | + matches, err := filepath.Glob(fs.sys.Path("fs/ext4/*")) |
| 76 | + if err != nil { |
| 77 | + return nil, err |
| 78 | + } |
| 79 | + |
| 80 | + stats := make([]*Stats, 0, len(matches)) |
| 81 | + for _, m := range matches { |
| 82 | + s := &Stats{} |
| 83 | + |
| 84 | + // "*" used in glob above indicates the name of the filesystem. |
| 85 | + name := filepath.Base(m) |
| 86 | + s.Name = name |
| 87 | + for file, p := range map[string]*uint64{ |
| 88 | + "errors_count": &s.Errors, |
| 89 | + "warning_count": &s.Warnings, |
| 90 | + "msg_count": &s.Messages, |
| 91 | + } { |
| 92 | + var val uint64 |
| 93 | + val, err = util.ReadUintFromFile(fs.sys.Path(sysFSPath, sysFSExt4Path, name, file)) |
| 94 | + if err == nil { |
| 95 | + *p = val |
| 96 | + } |
| 97 | + } |
| 98 | + |
| 99 | + stats = append(stats, s) |
| 100 | + } |
| 101 | + |
| 102 | + return stats, nil |
| 103 | +} |
0 commit comments