HPFS Read/Write filesystem driver.

How to install this driver?

Erase or move the content of linux/fs/hpfs/ directory and copy all these files
there. Then copy two .h files from include/ directory to linux/include/linux/
over original hpfs_fs_sb.h and hpfs_fs_i.h.

Go to kernel configuration (make menuconfig) and select HPFS filesystem. You can
compile it directly to the kernel or as a module. In configuration menu you
still see 'HPFS filesystem (readonly)' but it doesn't matter - it's read/write
now. Finally recompile kernel and modules. I recomend you to recompile the
whole kernel even if you want to use this driver as a module.

I tested this driver on 2.0.33 kernel but it should work on others too. It won't
work on new 2.1 kernels with dentry cache.
