JFFS2 file address space operation

[Amit Kumar Sharma]

Hi 

I find mmap operation for file failed in JFFS2, I find Jffs2 does not
support writepage in JFFS2 file address operation .I would like to know
reason for not supporting writepage operation for file address operation.
,
struct address_space_operations jffs2_file_address_operations =
{
        .readpage =     jffs2_readpage,
        .prepare_write =jffs2_prepare_write,
        .commit_write = jffs2_commit_write
};


Thanks
Amit