Writing to user file from kernel

[neha naik]

Hi,
 I know this is taboo and so on.But, i would like to know the difference between
'vfs_read' (similar to description in linux journal article :
http://www.linuxjournal.com/article/8110)
and the call 'splice_direct_to_actor'.
   'vfs_read' is strightforward but i don't understand the api
'splice_direct_to_actor'. Is there any documentation which will
explain it to me and where it is used. Because as i see it you can
read a file using either of the two 'vfs_read' or
'splice_direct_to_actor'. But, which is better.


Regards,
Neha