RAID 6 Async APIs for linux kernel 2.6.27

[koti.h...@gmail.com]

Hi All,

I am using linux kernel 2.6.27 kernel, is async_tx APIs available for
this kernel, if yes can you please provide me the link.

I downloaded for the following links RAID6 APIs,

git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git raid6
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/md.git raid6-for-
neil

In this patches I have the following doubts, can anybody help in
analyzing these patches,

1) The Async APIs async_pq, async_r6_dd_recov from where we are using
this calls.
2) How the link happens between md-raid driver and this async calls.

Thanks inadvance,
Satha koti.