Fix review comments

changelog/unreleased/pull-4980

@@ -1,10 +1,12 @@
 Bugfix: Skip EA processing in Windows for volumes that do not support EA
 
 Restic was failing to backup files on some windows paths like network
-drives because of errors while fetching ExtendedAttributes.
+drives because of errors while fetching extended attributes.
 Either they return error codes like windows.E_NOT_SET or
 windows.ERROR_INVALID_FUNCTION or it results in slower backups.
-Restic now completely skips the attempt to fetch Extended Attributes
+Restic now completely skips the attempt to fetch extended attributes
 for such volumes where it is not supported.
 
 https://github.com/restic/restic/pull/4980
+https://github.com/restic/restic/issues/4955
+https://github.com/restic/restic/issues/4950

internal/fs/sd_windows.go

@@ -11,6 +11,7 @@ import (
 	"unsafe"
 
 	"github.com/restic/restic/internal/debug"
+	"github.com/restic/restic/internal/errors"
 	"golang.org/x/sys/windows"
 )
 
@@ -60,6 +61,8 @@ func GetSecurityDescriptor(filePath string) (securityDescriptor *[]byte, err err
 			if err != nil {
 				return nil, fmt.Errorf("get low-level named security info failed with: %w", err)
 			}
+		} else if errors.Is(err, windows.ERROR_NOT_SUPPORTED) {
+			return nil, nil
 		} else {
 			return nil, fmt.Errorf("get named security info failed with: %w", err)
 		}

internal/restic/node_windows.go

@@ -392,7 +392,7 @@ func (node *Node) fillGenericAttributes(path string, fi os.FileInfo, stat *statT
 			return false, err
 		}
 		if sd, err = fs.GetSecurityDescriptor(path); err != nil {
-			return true, err
+			return allowExtended, err
 		}
 	}
 	// Add Windows attributes