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 <yur@xxxxxxxxxxx> Signed-off-by: Mikhail Cherkashin <mike@xxxxxxxxxxx> --
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.
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