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void vfs_truncate(ipc_callid_t rid, ipc_call_t *request)

{

    int fd = IPC_GET_ARG1(*request);

    size_t size = IPC_GET_ARG2(*request);

    ipcarg_t rc;

    vfs_file_t *file = vfs_file_get(fd);

    if (!file) {

        ipc_answer_0(rid, ENOENT);

        return;

    }

    futex_down(&file->lock);

    rwlock_write_lock(&file->node->contents_rwlock);

    int fs_phone = vfs_grab_phone(file->node->fs_handle);

    rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)file->node->dev_handle,

        (ipcarg_t)file->node->index, (ipcarg_t)size);

    vfs_release_phone(fs_phone);

    if (rc == EOK)

        file->node->size = size;

    rwlock_write_unlock(&file->node->contents_rwlock);

    futex_up(&file->lock);

    return rc; 

}