in kernel compilation of ext3

[Onkar <onkar.n.m@xxxxxxxxx>]

I compiled the kernel with CONFIG_EXT3_FS=y ; having done that now  , do these functions get called : 

module_init(init_ext3_fs)
module_exit(exit_ext3_fs)


??

or  how does the file system register itself ???

i.e., from where does register_filesystem(&ext3_fs_type) 
get called ????
Please give me some pointers ..


-- 
Thanks & regards,
Onkar Mahajan