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staging: erofs: add erofs in-memory stuffs
- erofs_sb_info:
contains erofs-specific in-memory information.
- erofs_vnode:
contains vfs_inode and other fs-specific information.
same as super block, the only one in-memory definition exists.
- erofs_map_blocks
plays a role in the file L2P mapping
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>