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package filesys
import (
"sync"
"github.com/seaweedfs/fuse/fs"
"github.com/chrislusf/seaweedfs/weed/util"
)
type FsCache struct {
root *FsNode
sync.RWMutex
}
type FsNode struct {
parent *FsNode
node fs.Node
name string
childrenLock sync.RWMutex
children map[string]*FsNode
}
func newFsCache(root fs.Node) *FsCache {
return &FsCache{
root: &FsNode{
node: root,
},
}
}
func (c *FsCache) GetFsNode(path util.FullPath) fs.Node {
c.RLock()
defer c.RUnlock()
return c.doGetFsNode(path)
}
func (c *FsCache) doGetFsNode(path util.FullPath) fs.Node {
t := c.root
for _, p := range path.Split() {
t = t.findChild(p)
if t == nil {
return nil
}
}
return t.node
}
func (c *FsCache) SetFsNode(path util.FullPath, node fs.Node) {
c.Lock()
defer c.Unlock()
c.doSetFsNode(path, node)
}
func (c *FsCache) doSetFsNode(path util.FullPath, node fs.Node) {
t := c.root
for _, p := range path.Split() {
t = t.ensureChild(p)
}
t.node = node
}
func (c *FsCache) EnsureFsNode(path util.FullPath, genNodeFn func() fs.Node) fs.Node {
c.Lock()
defer c.Unlock()
t := c.doGetFsNode(path)
if t != nil {
return t
}
t = genNodeFn()
c.doSetFsNode(path, t)
return t
}
func (c *FsCache) DeleteFsNode(path util.FullPath) {
c.Lock()
defer c.Unlock()
t := c.root
for _, p := range path.Split() {
t = t.findChild(p)
if t == nil {
return
}
}
if t.parent != nil {
t.parent.disconnectChild(t)
}
t.deleteSelf()
}
// oldPath and newPath are full path including the new name
func (c *FsCache) Move(oldPath util.FullPath, newPath util.FullPath) *FsNode {
c.Lock()
defer c.Unlock()
// find old node
src := c.root
for _, p := range oldPath.Split() {
src = src.findChild(p)
if src == nil {
return src
}
}
if src.parent != nil {
src.parent.disconnectChild(src)
}
// find new node
target := c.root
for _, p := range newPath.Split() {
target = target.ensureChild(p)
}
parent := target.parent
if dir, ok := src.node.(*Dir); ok {
dir.name = target.name // target is not Dir, but a shortcut
}
if f, ok := src.node.(*File); ok {
f.Name = target.name
if f.entry != nil {
f.entry.Name = f.Name
}
}
parent.disconnectChild(target)
target.deleteSelf()
src.name = target.name
src.connectToParent(parent)
return src
}
func (n *FsNode) connectToParent(parent *FsNode) {
n.parent = parent
oldNode := parent.findChild(n.name)
if oldNode != nil {
oldNode.deleteSelf()
}
if dir, ok := n.node.(*Dir); ok {
if parent.node != nil {
dir.parent = parent.node.(*Dir)
}
}
if f, ok := n.node.(*File); ok {
if parent.node != nil {
f.dir = parent.node.(*Dir)
}
}
n.childrenLock.Lock()
parent.children[n.name] = n
n.childrenLock.Unlock()
}
func (n *FsNode) findChild(name string) *FsNode {
n.childrenLock.RLock()
defer n.childrenLock.RUnlock()
child, found := n.children[name]
if found {
return child
}
return nil
}
func (n *FsNode) ensureChild(name string) *FsNode {
n.childrenLock.Lock()
defer n.childrenLock.Unlock()
if n.children == nil {
n.children = make(map[string]*FsNode)
}
child, found := n.children[name]
if found {
return child
}
t := &FsNode{
parent: n,
node: nil,
name: name,
children: nil,
}
n.children[name] = t
return t
}
func (n *FsNode) disconnectChild(child *FsNode) {
n.childrenLock.Lock()
delete(n.children, child.name)
n.childrenLock.Unlock()
child.parent = nil
}
func (n *FsNode) deleteSelf() {
n.childrenLock.Lock()
for _, child := range n.children {
child.deleteSelf()
}
n.children = nil
n.childrenLock.Unlock()
n.node = nil
n.parent = nil
}
|
