diff --git a/src/db/userstore/user_store.go b/src/db/userstore/user_store.go
index d2292bc..e33619c 100644
--- a/src/db/userstore/user_store.go
+++ b/src/db/userstore/user_store.go
@@ -67,6 +67,7 @@ type IUserStore interface {
 	SetInfo(id uint64, user *db.User) error
 	CanIncrUsed(id uint64, capacity int64) (bool, error)
 	SetUsed(id uint64, incr bool, capacity int64) error
+	ResetUsed(id uint64, used int64) error
 	SetPwd(id uint64, pwd string) error
 	SetPreferences(id uint64, settings *db.Preferences) error
 	ListUsers() ([]*db.User, error)
@@ -369,6 +370,32 @@ func (us *KVUserStore) SetUsed(id uint64, incr bool, capacity int64) error {
 	return us.store.SetStringIn(db.UsersNs, userID, string(infoBytes))
 }
 
+func (us *KVUserStore) ResetUsed(id uint64, used int64) error {
+	us.mtx.Lock()
+	defer us.mtx.Unlock()
+
+	userID := fmt.Sprint(id)
+	infoStr, ok := us.store.GetStringIn(db.UsersNs, userID)
+	if !ok {
+		return fmt.Errorf("user (%d) does not exist", id)
+	}
+
+	gotUser := &db.User{}
+	err := json.Unmarshal([]byte(infoStr), gotUser)
+	if err != nil {
+		return err
+	} else if gotUser.ID != id {
+		return fmt.Errorf("user id key(%d) info(%d) does match", id, gotUser.ID)
+	}
+
+	gotUser.UsedSpace = used
+	infoBytes, err := json.Marshal(gotUser)
+	if err != nil {
+		return err
+	}
+	return us.store.SetStringIn(db.UsersNs, userID, string(infoBytes))
+}
+
 func (us *KVUserStore) SetInfo(id uint64, user *db.User) error {
 	us.mtx.Lock()
 	defer us.mtx.Unlock()
diff --git a/src/handlers/fileshdr/async_handlers.go b/src/handlers/fileshdr/async_handlers.go
index a000640..6a6ae59 100644
--- a/src/handlers/fileshdr/async_handlers.go
+++ b/src/handlers/fileshdr/async_handlers.go
@@ -9,7 +9,9 @@ import (
 	"github.com/ihexxa/quickshare/src/worker"
 )
 
-const MsgTypeSha1 = "sha1"
+const (
+	MsgTypeSha1 = "sha1"
+)
 
 type Sha1Params struct {
 	FilePath string
diff --git a/src/handlers/multiusers/async_handlers.go b/src/handlers/multiusers/async_handlers.go
new file mode 100644
index 0000000..9829b3b
--- /dev/null
+++ b/src/handlers/multiusers/async_handlers.go
@@ -0,0 +1,48 @@
+package multiusers
+
+import (
+	"encoding/json"
+	"fmt"
+	"path/filepath"
+
+	"github.com/ihexxa/quickshare/src/worker"
+)
+
+const (
+	MsgTypeResetUsedSpace = "reset-used-space"
+)
+
+type UsedSpaceParams struct {
+	UserID       uint64
+	UserHomePath string
+}
+
+func (h *MultiUsersSvc) resetUsedSpace(msg worker.IMsg) error {
+	params := &UsedSpaceParams{}
+	err := json.Unmarshal([]byte(msg.Body()), params)
+	if err != nil {
+		return fmt.Errorf("fail to unmarshal sha1 msg: %w", err)
+	}
+
+	usedSpace := int64(0)
+	dirQueue := []string{params.UserHomePath}
+	for len(dirQueue) > 0 {
+		dirPath := dirQueue[0]
+		dirQueue = dirQueue[1:]
+
+		infos, err := h.deps.FS().ListDir(dirPath)
+		if err != nil {
+			return err
+		}
+
+		for _, info := range infos {
+			if info.IsDir() {
+				dirQueue = append(dirQueue, filepath.Join(dirPath, info.Name()))
+			} else {
+				usedSpace += info.Size()
+			}
+		}
+	}
+
+	return h.deps.Users().ResetUsed(params.UserID, usedSpace)
+}
diff --git a/src/handlers/multiusers/handlers.go b/src/handlers/multiusers/handlers.go
index d699d48..61e4a47 100644
--- a/src/handlers/multiusers/handlers.go
+++ b/src/handlers/multiusers/handlers.go
@@ -1,6 +1,7 @@
 package multiusers
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"path/filepath"
@@ -16,6 +17,7 @@ import (
 	"github.com/ihexxa/quickshare/src/db/userstore"
 	"github.com/ihexxa/quickshare/src/depidx"
 	q "github.com/ihexxa/quickshare/src/handlers"
+	"github.com/ihexxa/quickshare/src/worker/localworker"
 )
 
 var (
@@ -48,6 +50,7 @@ func NewMultiUsersSvc(cfg gocfg.ICfg, deps *depidx.Deps) (*MultiUsersSvc, error)
 		apiRuleCname(userstore.AdminRole, "GET", "/v1/users/list"):            true,
 		apiRuleCname(userstore.AdminRole, "GET", "/v1/users/self"):            true,
 		apiRuleCname(userstore.AdminRole, "PATCH", "/v1/users/preferences"):   true,
+		apiRuleCname(userstore.AdminRole, "PUT", "/v1/users//used-space"):     true,
 		apiRuleCname(userstore.AdminRole, "POST", "/v1/roles/"):               true,
 		apiRuleCname(userstore.AdminRole, "DELETE", "/v1/roles/"):             true,
 		apiRuleCname(userstore.AdminRole, "GET", "/v1/roles/list"):            true,
@@ -77,6 +80,7 @@ func NewMultiUsersSvc(cfg gocfg.ICfg, deps *depidx.Deps) (*MultiUsersSvc, error)
 		apiRuleCname(userstore.AdminRole, "GET", "/v1/fs/sharings/dirs"):      true,
 		apiRuleCname(userstore.AdminRole, "GET", "/v1/fs/sharings/ids"):       true,
 		apiRuleCname(userstore.AdminRole, "POST", "/v1/fs/hashes/sha1"):       true,
+
 		// user rules
 		apiRuleCname(userstore.UserRole, "GET", "/"):                       true,
 		apiRuleCname(userstore.UserRole, "GET", publicPath):                true,
@@ -125,11 +129,14 @@ func NewMultiUsersSvc(cfg gocfg.ICfg, deps *depidx.Deps) (*MultiUsersSvc, error)
 		apiRuleCname(userstore.VisitorRole, "GET", "/v1/fs/sharings/dirs"):    true,
 	}
 
-	return &MultiUsersSvc{
+	handlers := &MultiUsersSvc{
 		cfg:        cfg,
 		deps:       deps,
 		apiACRules: apiACRules,
-	}, nil
+	}
+	deps.Workers().AddHandler(MsgTypeResetUsedSpace, handlers.resetUsedSpace)
+
+	return handlers, nil
 }
 
 func (h *MultiUsersSvc) Init(adminName, adminPwd string) (string, error) {
@@ -707,3 +714,43 @@ func (h *MultiUsersSvc) SetPreferences(c *gin.Context) {
 	}
 	c.JSON(q.Resp(200))
 }
+
+type ResetUsedSpaceReq struct {
+	UserID uint64 `json:"userID,string"`
+}
+
+func (h *MultiUsersSvc) ResetUsedSpace(c *gin.Context) {
+	req := &ResetUsedSpaceReq{}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(q.ErrResp(c, 400, err))
+		return
+	}
+
+	userInfo, err := h.deps.Users().GetUser(req.UserID)
+	if err != nil {
+		c.JSON(q.ErrResp(c, 500, err))
+		return
+	}
+	msg, err := json.Marshal(UsedSpaceParams{
+		UserID:       req.UserID,
+		UserHomePath: userInfo.Name,
+	})
+	if err != nil {
+		c.JSON(q.ErrResp(c, 500, err))
+		return
+	}
+
+	err = h.deps.Workers().TryPut(
+		localworker.NewMsg(
+			h.deps.ID().Gen(),
+			map[string]string{localworker.MsgTypeKey: MsgTypeResetUsedSpace},
+			string(msg),
+		),
+	)
+	if err != nil {
+		c.JSON(q.ErrResp(c, 500, err))
+		return
+	}
+
+	c.JSON(q.Resp(200))
+}
diff --git a/src/server/server.go b/src/server/server.go
index 0e52849..98a59b7 100644
--- a/src/server/server.go
+++ b/src/server/server.go
@@ -275,6 +275,7 @@ func initHandlers(router *gin.Engine, cfg gocfg.ICfg, deps *depidx.Deps) (*gin.E
 	usersAPI.GET("/self", userHdrs.Self)
 	usersAPI.PATCH("/", userHdrs.SetUser)
 	usersAPI.PATCH("/preferences", userHdrs.SetPreferences)
+	usersAPI.PUT("/used-space", userHdrs.ResetUsedSpace)
 
 	rolesAPI := v1.Group("/roles")
 	rolesAPI.POST("/", userHdrs.AddRole)
diff --git a/src/server/testdata/test_quickshare.db b/src/server/testdata/test_quickshare.db
index 32e6082..1d9535b 100644
Binary files a/src/server/testdata/test_quickshare.db and b/src/server/testdata/test_quickshare.db differ
diff --git a/src/worker/interface.go b/src/worker/interface.go
index 5f0826b..f060b60 100644
--- a/src/worker/interface.go
+++ b/src/worker/interface.go
@@ -2,7 +2,10 @@ package worker
 
 import "errors"
 
-var ErrFull = errors.New("worker queue is full, make it larger in the config.")
+var (
+	ErrFull   = errors.New("worker queue is full, make it larger in the config")
+	ErrClosed = errors.New("async handlers are closed")
+)
 
 func IsErrFull(err error) bool {
 	return err == ErrFull
diff --git a/src/worker/localworker/worker.go b/src/worker/localworker/worker.go
index cdadade..f4237bf 100644
--- a/src/worker/localworker/worker.go
+++ b/src/worker/localworker/worker.go
@@ -10,6 +10,8 @@ import (
 	"github.com/ihexxa/quickshare/src/worker"
 )
 
+// TODO: support context
+
 const (
 	MsgTypeKey = "msg-type"
 )
@@ -42,6 +44,7 @@ func (m *Msg) Body() string {
 
 type WorkerPool struct {
 	on          bool
+	listening   bool
 	queue       chan worker.IMsg
 	sleep       int
 	workerCount int
@@ -54,6 +57,7 @@ type WorkerPool struct {
 func NewWorkerPool(queueSize, sleep, workerCount int, logger *zap.SugaredLogger) *WorkerPool {
 	return &WorkerPool{
 		on:          true,
+		listening:   true,
 		logger:      logger,
 		mtx:         &sync.RWMutex{},
 		sleep:       sleep,
@@ -68,6 +72,9 @@ func (wp *WorkerPool) TryPut(task worker.IMsg) error {
 	wp.mtx.Lock()
 	defer wp.mtx.Unlock()
 
+	if !wp.listening {
+		return worker.ErrClosed
+	}
 	if len(wp.queue) == cap(wp.queue) {
 		return worker.ErrFull
 	}
@@ -80,6 +87,7 @@ func (wp *WorkerPool) Start() {
 	defer wp.mtx.Unlock()
 
 	wp.on = true
+	wp.listening = true
 	for wp.started < wp.workerCount {
 		go wp.startWorker()
 		wp.started++
@@ -90,6 +98,8 @@ func (wp *WorkerPool) Stop() {
 	wp.mtx.Lock()
 	defer wp.mtx.Unlock()
 
+	wp.listening = false
+
 	// TODO: avoid sending and panic
 	for len(wp.queue) > 0 {
 		wp.logger.Infof(