staging: erofs: introduce error injection infrastructure
This patch introduces error injection infrastructure, with it, we can inject error in any kernel exported common functions which erofs used, so that it can force erofs running into error paths, it turns out that tests can cover real rare paths more easily to find bugs. Reviewed-by: NGao Xiang <gaoxiang25@huawei.com> Signed-off-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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