Sung-Won Chung wrote:
> Is it possible to write a filesystem code in LKM ?
> I hopes to reduce development time, by removing tedious kernel recompiling.

Yes. See the stuff in sys/lkm/vfs. The LKM should normally
be just matter of adding simple LKM glue in lkminit_vfs.c
file; there are quite a few examples of this within the
directory. The LFS LKM even has some example of VFS LKM which
installs some syscalls too.
 
Jaromir