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77 lines
2.2 KiB
Go
77 lines
2.2 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 overlay
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import (
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"fmt"
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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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)
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type overlayPlugin struct{}
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// NewPlugin creates a new Overlay filesystem plugin.
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func NewPlugin() fs.FsPlugin {
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return &overlayPlugin{}
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}
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func (p *overlayPlugin) Name() string {
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return "overlay"
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}
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// CanHandle returns true if the filesystem type is overlay or overlay2.
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func (p *overlayPlugin) CanHandle(fsType string) bool {
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return fsType == "overlay"
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}
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// Priority returns 100 - Overlay has higher priority than VFS.
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func (p *overlayPlugin) Priority() int {
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return 100
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}
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// GetStats returns filesystem statistics for Overlay.
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// Overlay delegates to VFS for stats collection.
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func (p *overlayPlugin) GetStats(device string, partition fs.PartitionInfo) (*fs.FsStats, error) {
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// Overlay uses VFS stats
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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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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 Overlay mount processing.
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// Overlay fix: Making mount source unique for all overlay mounts, using the mount's major and minor ids.
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// This is needed because multiple overlay mounts can have the same source.
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func (p *overlayPlugin) ProcessMount(mnt *mount.Info) (bool, *mount.Info, error) {
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// Create a copy with unique source
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correctedMnt := *mnt
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correctedMnt.Source = fmt.Sprintf("%s_%d-%d", mnt.Source, mnt.Major, mnt.Minor)
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return true, &correctedMnt, nil
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}
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