Digging into raid5.c and raid6main.c...

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I've decided to base my rs-raid work on 2.6, and thus raid5.c and raid6main.c. I'm pretty sure I can utilize all the stripe buffer code pretty much verbatim, and most of the rework will need to be done to handle_stripe(). I've dug through most of it, updating things to correspond to m parity disks instead of 1 or 2. However, I've encountered something strange. From what I can tell, after a call to compute_block_1 or compute_block_2, I assumed that all the data in the stripe (including parity) was valid. However, around line 1270 in raid6main.c, compute_block_1 or 2 may be called, then immediately after the PRINTK, it calls compute_parity too. Isn't this redundant somehow? The logic that sets must_compute is also really complicated - can anyone explain this section to me?

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