vfs: add ELOOP error

cmd/cmount/fs.go

@@ -602,6 +602,8 @@ func translateError(err error) (errc int) {
 		return -fuse.ENOSYS
 	case vfs.EINVAL:
 		return -fuse.EINVAL
+	case vfs.ELOOP:
+		return -fuse.ELOOP
 	}
 	fs.Errorf(nil, "IO error: %v", err)
 	return -fuse.EIO

cmd/mount/fs.go

@@ -100,6 +100,8 @@ func translateError(err error) error {
 		return syscall.ENOSYS
 	case vfs.EINVAL:
 		return fuse.Errno(syscall.EINVAL)
+	case vfs.ELOOP:
+		return fuse.Errno(syscall.ELOOP)
 	}
 	fs.Errorf(nil, "IO error: %v", err)
 	return err

cmd/mount2/fs.go

@@ -128,6 +128,8 @@ func translateError(err error) syscall.Errno {
 		return syscall.ENOSYS
 	case vfs.EINVAL:
 		return syscall.EINVAL
+	case vfs.ELOOP:
+		return syscall.ELOOP
 	}
 	fs.Errorf(nil, "IO error: %v", err)
 	return syscall.EIO

vfs/errors.go

@@ -10,7 +10,7 @@ import (
 // Error describes low level errors in a cross platform way.
 type Error byte
 
-// NB if changing errors translateError in cmd/mount/fs.go, cmd/cmount/fs.go
+// NB if changing errors, update translateError in cmd/mount/fs.go, cmd/cmount/fs.go, cmd/mount2/fs.go
 
 // Low level errors
 const (
@@ -20,6 +20,7 @@ const (
 	EBADF
 	EROFS
 	ENOSYS
+	ELOOP
 )
 
 // Errors which have exact counterparts in os
@@ -38,6 +39,7 @@ var errorNames = []string{
 	EBADF:     "Bad file descriptor",
 	EROFS:     "Read only file system",
 	ENOSYS:    "Function not implemented",
+	ELOOP:     "Too many symbolic links",
 }
 
 // Error renders the error as a string