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108 lines
2.9 KiB
108 lines
2.9 KiB
// Copyright 2017 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package sysfs |
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import ( |
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"fmt" |
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"os" |
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"path/filepath" |
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"github.com/prometheus/procfs/bcache" |
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"github.com/prometheus/procfs/xfs" |
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) |
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// FS represents the pseudo-filesystem sys, which provides an interface to |
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// kernel data structures. |
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type FS string |
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// DefaultMountPoint is the common mount point of the sys filesystem. |
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const DefaultMountPoint = "/sys" |
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// NewFS returns a new FS mounted under the given mountPoint. It will error |
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// if the mount point can't be read. |
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func NewFS(mountPoint string) (FS, error) { |
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info, err := os.Stat(mountPoint) |
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if err != nil { |
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return "", fmt.Errorf("could not read %s: %s", mountPoint, err) |
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} |
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if !info.IsDir() { |
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return "", fmt.Errorf("mount point %s is not a directory", mountPoint) |
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} |
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return FS(mountPoint), nil |
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} |
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// Path returns the path of the given subsystem relative to the sys root. |
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func (fs FS) Path(p ...string) string { |
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return filepath.Join(append([]string{string(fs)}, p...)...) |
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} |
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// XFSStats retrieves XFS filesystem runtime statistics for each mounted XFS |
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// filesystem. Only available on kernel 4.4+. On older kernels, an empty |
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// slice of *xfs.Stats will be returned. |
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func (fs FS) XFSStats() ([]*xfs.Stats, error) { |
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matches, err := filepath.Glob(fs.Path("fs/xfs/*/stats/stats")) |
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if err != nil { |
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return nil, err |
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} |
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stats := make([]*xfs.Stats, 0, len(matches)) |
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for _, m := range matches { |
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f, err := os.Open(m) |
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if err != nil { |
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return nil, err |
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} |
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// "*" used in glob above indicates the name of the filesystem. |
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name := filepath.Base(filepath.Dir(filepath.Dir(m))) |
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// File must be closed after parsing, regardless of success or |
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// failure. Defer is not used because of the loop. |
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s, err := xfs.ParseStats(f) |
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_ = f.Close() |
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if err != nil { |
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return nil, err |
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} |
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s.Name = name |
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stats = append(stats, s) |
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} |
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return stats, nil |
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} |
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// BcacheStats retrieves bcache runtime statistics for each bcache. |
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func (fs FS) BcacheStats() ([]*bcache.Stats, error) { |
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matches, err := filepath.Glob(fs.Path("fs/bcache/*-*")) |
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if err != nil { |
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return nil, err |
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} |
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stats := make([]*bcache.Stats, 0, len(matches)) |
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for _, uuidPath := range matches { |
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// "*-*" in glob above indicates the name of the bcache. |
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name := filepath.Base(uuidPath) |
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// stats |
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s, err := bcache.GetStats(uuidPath) |
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if err != nil { |
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return nil, err |
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} |
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s.Name = name |
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stats = append(stats, s) |
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} |
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return stats, nil |
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}
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