staging: erofs: don't check special inode layout
Currently, we will check if inode layout is compression or inline if the inode is special in fill_inode(). Also set ->i_mapping->a_ops for it. That is pointless since the both modes won't be set for special inode when creating EROFS filesystem image. So, let's avoid it. Signed-off-by: NYue Hu <huyue2@yulong.com> Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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