Yuri Tikhonov wrote:
This patch adds support for asynchronous RAID-6 recovery operations.
An asynchronous implementation using async_tx API is provided to compute
two missing data blocks (async_r6_dd_recov) and to compute one missing data
block and one missing parity_block (async_r6_dp_recov).
In general, the RAID-6 recovery API is the wrappers which organize the
calculations algorithms using async_pqxor().
Please refer to the "The mathematics of RAID-6" wtite-paper written by
H.Peter Anvin available at www.kernel.org/pub/linux/kernel/people/hpa/raid6.pdf
for the theoretical basement of the algorithms implemented here.
Signed-off-by: Yuri Tikhonov <[EMAIL PROTECTED]>
Signed-off-by: Mikhail Cherkashin <[EMAIL PROTECTED]>
--
I really, *really*, don't like the name "pqxor", because it is actively
misleading. The P syndrome is an XOR, but the Q syndrome is not, and in
particular, does not exhibit the same properties as one would expect
from an XOR, in particular commutativity.
-hpa
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