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

[Joel Becker]

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.

Joel

-- 

Life's Little Instruction Book #337

	"Reread your favorite book."

Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127