mirror of
https://github.com/cubefs/cubefs.git
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61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
// Copyright 2018 The CubeFS Authors.
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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
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package fs
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import (
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"container/list"
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"sync"
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)
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// OrphanInodeList defines the orphan inode list, which is a list of orphan inodes.
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// An orphan inode is the inode whose nlink value is 0.
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type OrphanInodeList struct {
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sync.RWMutex
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cache map[uint64]*list.Element
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list *list.List
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}
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// NewOrphanInodeList returns a new orphan inode list.
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func NewOrphanInodeList() *OrphanInodeList {
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return &OrphanInodeList{
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cache: make(map[uint64]*list.Element),
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list: list.New(),
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}
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}
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// Put puts an inode into the orphan inode list.
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func (l *OrphanInodeList) Put(ino uint64) {
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l.Lock()
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defer l.Unlock()
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_, ok := l.cache[ino]
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if !ok {
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element := l.list.PushFront(ino)
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l.cache[ino] = element
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}
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}
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// Evict remove the given inode from the orphan inode list, and evicts it.
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func (l *OrphanInodeList) Evict(ino uint64) bool {
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l.Lock()
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defer l.Unlock()
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element, ok := l.cache[ino]
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if !ok {
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return false
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}
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l.list.Remove(element)
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delete(l.cache, ino)
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return true
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}
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