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86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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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//go:build linux
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package nfs
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import (
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"fmt"
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"strings"
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"github.com/google/cadvisor/fs"
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"github.com/google/cadvisor/fs/vfs"
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mount "github.com/moby/sys/mountinfo"
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"k8s.io/klog/v2"
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)
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type nfsPlugin struct{}
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// Ensure nfsPlugin implements FsCachingPlugin
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var _ fs.FsCachingPlugin = &nfsPlugin{}
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// NewPlugin creates a new NFS filesystem plugin.
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func NewPlugin() fs.FsPlugin {
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return &nfsPlugin{}
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}
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func (p *nfsPlugin) Name() string {
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return "nfs"
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}
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// CanHandle returns true if the filesystem type is NFS (nfs, nfs3, nfs4, etc.).
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func (p *nfsPlugin) CanHandle(fsType string) bool {
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return strings.HasPrefix(fsType, "nfs")
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}
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// Priority returns 50 - NFS has medium priority (higher than VFS but lower than specific plugins).
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func (p *nfsPlugin) Priority() int {
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return 50
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}
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// GetStats returns filesystem statistics for NFS.
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// NFS uses VFS stats.
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func (p *nfsPlugin) GetStats(device string, partition fs.PartitionInfo) (*fs.FsStats, error) {
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capacity, free, avail, inodes, inodesFree, err := vfs.GetVfsStats(partition.Mountpoint)
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if err != nil {
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klog.V(4).Infof("the file system type is %s, partition mountpoint does not exist: %v, error: %v",
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partition.FsType, partition.Mountpoint, err)
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return nil, err
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}
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return &fs.FsStats{
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Capacity: capacity,
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Free: free,
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Available: avail,
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Inodes: &inodes,
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InodesFree: &inodesFree,
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Type: fs.VFS,
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}, nil
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}
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// ProcessMount handles NFS mount processing.
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// For NFS, no special processing is needed.
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func (p *nfsPlugin) ProcessMount(mnt *mount.Info) (bool, *mount.Info, error) {
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return true, mnt, nil
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}
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// CacheKey returns a cache key based on device ID (major:minor).
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// NFS mounts with the same device ID share the same underlying filesystem,
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// so we can cache stats to avoid redundant statfs calls.
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func (p *nfsPlugin) CacheKey(partition fs.PartitionInfo) string {
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return fmt.Sprintf("%d:%d", partition.Major, partition.Minor)
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}
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