Re: Need information regarding RAID 6 Async APIs for kernel version 2.6.27

On Thu, May 28, 2009 at 10:57 AM, Koti [off-list ref] wrote:

Hi All,

When I am using the linux kernel version 2.6.21, I applied the RAID5 and RAID6
Async_tx APIs, and those are working fine.

But When I upgraded to linux kernel version 2.6.27, it has RAID5 async_tx APIs
inline, but not the RAID6.

I downloaded the recent RAID6 async_tx APIs released on March2009, from the
links

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


The following is my questions:
1) Is these are suitable for my kernel version, if not can you please provide
me the link where I can get the patches for this kernel.

The most up to date code is found in:
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git raid6

It is based on the 2.6.29 kernel plus the patches that were merged for
drivers/md/ during the 2.6.30 merge window.  There is currently no
plan to provide updated patches for kernel versions prior to 2.6.29.

1) If these are currect one Iam looking, then I have a few more doubts while
traversing the code, It has async calls like async_pq, async_r6_dd_recov, ...
From where these functions are invoked
how the link happens between these async calls and the md-raid driver.

Can anybody help in solving this problem, it is very useful for my work.
Thanks in advance for your support.

Please try the latest code in the raid6 branch, it has been updated
according to review comments and includes the changes to
drivers/md/raid5.c to invoke asynchronous raid6 operation.  Note that
this branch of the tree will periodically rebase as review feedback is
incorporated into the patches.  I understand this makes the tree
difficult to track with git.  My recommendation is to add it as a
remote branch and use git fetch and git reset to stay up to date:

git remote add async_tx
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git
git fetch async_tx
git checkout -b test-raid6 async_tx/raid6

...then to update (assuming you are still on the test-raid6 branch):
git fetch async_tx
git reset async_tx/raid6

Regards,
Dan