can attr root directory

weed/mount/inode_to_path.go

@@ -0,0 +1,61 @@
+package mount
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"sync"
+)
+
+type InodeToPath struct {
+	sync.RWMutex
+	nextInodeId uint64
+	inode2path  map[uint64]util.FullPath
+	path2inode  map[util.FullPath]uint64
+}
+
+func NewInodeToPath() *InodeToPath {
+	return &InodeToPath{
+		inode2path:  make(map[uint64]util.FullPath),
+		path2inode:  make(map[util.FullPath]uint64),
+		nextInodeId: 2, // the root inode id is 1
+	}
+}
+
+func (i *InodeToPath) GetInode(path util.FullPath) uint64 {
+	if path == "/" {
+		return 1
+	}
+	i.Lock()
+	defer i.Unlock()
+	inode, found := i.path2inode[path]
+	if !found {
+		inode = i.nextInodeId
+		i.nextInodeId++
+		i.path2inode[path] = inode
+		i.inode2path[inode] = path
+	}
+	return inode
+}
+
+func (i *InodeToPath) GetPath(inode uint64) util.FullPath {
+	if inode == 1 {
+		return "/"
+	}
+	i.RLock()
+	defer i.RUnlock()
+	path, found := i.inode2path[inode]
+	if !found {
+		glog.Fatal("not found inode %d", inode)
+	}
+	return path
+}
+
+func (i *InodeToPath) HasPath(path util.FullPath) bool {
+	if path == "/" {
+		return true
+	}
+	i.RLock()
+	defer i.RUnlock()
+	_, found := i.path2inode[path]
+	return found
+}