some fixes

pkg/fs/metadata.go

@@ -5,6 +5,7 @@ package fs
 import (
 	"cachefs/pkg/chunk"
 	"cachefs/pkg/provider"
+	"cachefs/pkg/provider/sftp"
 	"context"
 	"encoding/json"
 	"errors"
@@ -80,19 +81,20 @@ func MetadataGenerator(file string, dst provider.FS, fstat, encrypted bool) erro
 			return nil
 		}
 		size := fi.Size()
+		path = "/" + strings.TrimPrefix(path, dst.Root())
 		if fstat {
 			blocks, err := dst.Fstat(f.Fd())
 			if err != nil {
 				return nil
 			}
 			if size <= blocks*512 {
-				md[strings.TrimPrefix(path, dst.Root())] = &Metadata{
+				md[path] = &Metadata{
 					Size:   size,
 					Chunks: chunk.Chunks{{0, size}},
 				}
 			}
 		} else {
-			md[strings.TrimPrefix(path, dst.Root())] = &Metadata{
+			md[path] = &Metadata{
 				Size:   size,
 				Chunks: chunk.Chunks{{0, size}},
 			}
@@ -332,7 +334,7 @@ func MapError(err error) error {
 }
 
 func IsIOErr(err error) bool {
-	return MapError(err) == IOErr
+	return MapError(err) == IOErr || errors.Is(err, sftp.ErrNotConnected)
 }
 
 type Metadata struct {

pkg/fs/preload.go

@@ -53,8 +53,12 @@ func NewPreloadHandler(ctx context.Context, fs *FS, max int, log logr.Logger) (p
 func (ph *PreloadHandler) CancelPreload(name string) {
 	ph.mu.Lock()
 	defer ph.mu.Unlock()
-	if p, ok := ph.pm[name]; ok && p.Running {
-		p.cancel()
+	p, ok := ph.pm[name]
+	if ok {
+		if p.Running {
+			p.cancel()
+		}
+		delete(ph.pm, name)
 	}
 }