[Ocfs2-devel] [PATCH 0/5 v2] Add readahead support in CoW for reflinked files.

[Tao Ma]

On 08/12/2010 10:25 AM, Joel Becker wrote:
> On Thu, Jul 15, 2010 at 11:04:37AM +0800, Tao Ma wrote:
>> On 07/15/2010 10:31 AM, Joel Becker wrote:
>>> On Wed, Jul 14, 2010 at 03:52:26PM +0800, Tao Ma wrote:
>>>> 	When we try to CoW some clusters for a reflinked file, we have to
>>>> read the contents first, allocate some clusters and then map these
>>>> pages to the new clusters. Currently, we use block_read_full_page to
>>>> read it, but it is a little bit slower.
>>>> 	So this patch set try to add readahead support for CoW. Before we
>>>> start, we call readahead first so that the pages can be read at the
>>>> very first. And during CoW, when we find a readahead page, we know
>>>> that we need to move the readahead window, so a new asyncreadahead
>>>> is called.
>>>
>>> 	I think this looks good.  Can you create a branch in your git
>>> tree for it?  I'll pull when I build merge-window.
>> done. please pull from
>> git://oss.oracle.com/git/tma/linux-2.6.git cow_readahead.
>
> 	I tried pulling this, and it conflicts with the zero-tail fix.
> Can you rebase it for me?  I want to make sure we get the readahead
> right.
done. Please pull the same branch. It should work now.

btw, I still have the patch "[PATCH v5] ocfs2: Let ocfs2_setattr use new 
truncate sequence." waiting for being included. So what's your option?

Regards,
Tao