Re: [RFC/PATCH 2/4] fs/mm: execute in place (3rd version)

[Carsten Otte <cotte@freenet.de>]

Suparna Bhattacharya wrote:

>On Mon, May 23, 2005 at 07:30:20PM +0200, Carsten Otte wrote:
>  
>
>>diff -ruN linux-git/mm/filemap.h linux-git-xip/mm/filemap.h
>>--- linux-git/mm/filemap.h	1970-01-01 01:00:00.000000000 +0100
>>+++ linux-git-xip/mm/filemap.h	2005-05-23 19:01:27.000000000 +0200
>>@@ -0,0 +1,94 @@
>>+/*
>>+ *	linux/mm/filemap.c
>>+ *
>>    
>>
>
>I guess you meant "filemap.h" not "filemap.c" ? Shouldn't this be
>in include/linux instead ?
>  
>
Yea, Andrew Morton fixed this one while merging into -mm. Cut&Paste - sorry

> OK, though this leaves filemap.c alone which is good, I have to admit
>
>that this entire duplication of read/write routines really worries me.
>
>There has to be a third way.
>  
>
Well those carbon copied functions are -as Christoph pointed out- just
wrappers. In addition,
we don't have sync read/write, just aio_read/aio_write, readv/writev,
and sendfile.
We saved almost as much patches to filemap.c as we have added stuff to
filemap_xip:
cotte@cotte:~/patches$ cat v2/linux-2.6-xip-2-filemap.patch |wc -l
789
cotte@cotte:~/patches$ cat v3/linux-2.6-xip-2-filemap.patch |wc -l
868
Given that the copied wrappers add just 80 lines after all, I agree with
Christoph that this is
worth buying reduced complexity for.

cheers,
Carsten