[linux-cifs-client] Re: readahead not being thrown away by invalidate_inode_pages in 2.4

[Andrew Morton]

Andreas Dilger <adilger at clusterfs.com> wrote:
>
> > (Delayed response)
>  > 
>  > invalidate_inode_pages() is just best-effort.  If pages are currently under
>  > I/O then they will not be invalidated.
>  > 
>  > You will probably have some success with
>  > 
>  > 	down(i_sem)
>  > 	filemap_fdatasync()
>  > 	filemap_fdatawait()
>  > 	invalidate_inode_pages()
>  > 	up(i_sem)
> 
>  What about truncate_inode_pages(inode, 0)? 

If someone is mmapping those pages they'll end up with anonymous pages
where they thought they had pagecache.