staging: erofs: add on-disk layout
This commit adds the on-disk layout header file of erofs. Note that the on-disk layout is still WIP, and some fields are reserved for the future use by design. Any comments are welcome. Thanks-to: Li Guifu <liguifu2@huawei.com> Thanks-to: Sun Qiuyang <sunqiuyang@huawei.com> Signed-off-by: Miao Xie <miaoxie@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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