diff --git a/src/fileinfostore/file_info_store.go b/src/fileinfostore/file_info_store.go
new file mode 100644
index 0000000..50e7d22
--- /dev/null
+++ b/src/fileinfostore/file_info_store.go
@@ -0,0 +1,52 @@
+package userstore
+
+import (
+	"github.com/ihexxa/quickshare/src/kvstore"
+)
+
+const (
+	InitNs      = "Init"
+	SharingNs   = "sharing"
+	InitTimeKey = "initTime"
+)
+
+type IFileInfoStore interface {
+	AddSharing(dirPath string) error
+	DelSharing(dirPath string) error
+	ListSharings(prefix string) (map[string]bool, error)
+}
+
+type FileInfoStore struct {
+	store kvstore.IKVStore
+}
+
+func NewFileInfoStore(store kvstore.IKVStore) (*FileInfoStore, error) {
+	_, ok := store.GetStringIn(InitNs, InitTimeKey)
+	if !ok {
+		var err error
+		for _, nsName := range []string{
+			InitNs,
+			SharingNs,
+		} {
+			if err = store.AddNamespace(nsName); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return &FileInfoStore{
+		store: store,
+	}, nil
+}
+
+func (us *FileInfoStore) AddSharing(dirPath string) error {
+	return us.store.SetBoolIn(SharingNs, dirPath, true)
+}
+
+func (us *FileInfoStore) DelSharing(dirPath string) error {
+	return us.store.DelBoolIn(SharingNs, dirPath)
+}
+
+func (us *FileInfoStore) ListSharings(prefix string) (map[string]bool, error) {
+	return us.store.ListBoolsByPrefixIn(prefix, SharingNs)
+}
diff --git a/src/fileinfostore/file_info_store_test.go b/src/fileinfostore/file_info_store_test.go
new file mode 100644
index 0000000..848b7f0
--- /dev/null
+++ b/src/fileinfostore/file_info_store_test.go
@@ -0,0 +1,70 @@
+package userstore
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/ihexxa/quickshare/src/kvstore/boltdbpvd"
+)
+
+func TestUserStores(t *testing.T) {
+
+	testSharingMethods := func(t *testing.T, store IFileInfoStore) {
+		dirPaths := []string{"admin/path1", "admin/path1/path2"}
+		var err error
+		for _, dirPath := range dirPaths {
+			err = store.AddSharing(dirPath)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		prefix := "admin"
+		sharingMap, err := store.ListSharings(prefix)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, sharingDir := range dirPaths {
+			if !sharingMap[sharingDir] {
+				t.Fatalf("sharing(%s) not found", sharingDir)
+			}
+		}
+
+		for _, dirPath := range dirPaths {
+			err = store.DelSharing(dirPath)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		sharingMap, err = store.ListSharings(prefix)
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, dirPath := range dirPaths {
+			if sharingMap[dirPath] {
+				t.Fatalf("sharing(%s) should not exist", dirPath)
+			}
+		}
+	}
+
+	t.Run("testing FileInfoStore", func(t *testing.T) {
+		rootPath, err := ioutil.TempDir("./", "quickshare_userstore_test_")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(rootPath)
+
+		kvstore := boltdbpvd.New(rootPath, 1024)
+		defer kvstore.Close()
+
+		store, err := NewFileInfoStore(kvstore)
+		if err != nil {
+			t.Fatal("fail to new kvstore", err)
+		}
+
+		testSharingMethods(t, store)
+	})
+}
diff --git a/src/kvstore/boltdbpvd/provider.go b/src/kvstore/boltdbpvd/provider.go
index 671ca12..055ced0 100644
--- a/src/kvstore/boltdbpvd/provider.go
+++ b/src/kvstore/boltdbpvd/provider.go
@@ -1,6 +1,7 @@
 package boltdbpvd
 
 import (
+	"bytes"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -154,6 +155,25 @@ func (bp *BoltPvd) ListBoolsIn(ns string) (map[string]bool, error) {
 	return list, err
 }
 
+func (bp *BoltPvd) ListBoolsByPrefixIn(prefix, ns string) (map[string]bool, error) {
+	results := map[string]bool{}
+
+	err := bp.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(ns)).Cursor()
+		if b == nil {
+			return ErrBucketNotFound
+		}
+
+		prefixBytes := []byte(prefix)
+		for k, _ := b.Seek(prefixBytes); k != nil && bytes.HasPrefix(k, prefixBytes); k, _ = b.Next() {
+			results[string(k)] = true
+		}
+		return nil
+	})
+
+	return results, err
+}
+
 func (bp *BoltPvd) GetInt(key string) (int, bool) {
 	x, ok := bp.GetInt64(key)
 	return int(x), ok
diff --git a/src/kvstore/kvstore_interface.go b/src/kvstore/kvstore_interface.go
index ddbcfce..9de7505 100644
--- a/src/kvstore/kvstore_interface.go
+++ b/src/kvstore/kvstore_interface.go
@@ -17,6 +17,7 @@ type IKVStore interface {
 	DelBoolIn(ns, key string) error
 	ListBools() (map[string]bool, error)
 	ListBoolsIn(ns string) (map[string]bool, error)
+	ListBoolsByPrefixIn(prefix, ns string) (map[string]bool, error)
 	GetInt(key string) (int, bool)
 	SetInt(key string, val int) error
 	DelInt(key string) error