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authorDan Williams <dan.j.williams@intel.com>2009-10-19 14:05:12 -0700
committerDan Williams <dan.j.williams@intel.com>2009-10-19 23:34:46 -0700
commitda17bf4306fd3a52e938b121df82a7baa10eb282 (patch)
treec5e5056287547e6674b63c690c911367e76f8d09 /Documentation/kvm
parent030b07720be0f3bfada12ff6bfa3c61a91212f32 (diff)
async_tx: fix asynchronous raid6 recovery for ddf layouts
The raid6 recovery code currently requires special handling of the 4-disk and 5-disk recovery scenarios for the native layout. Quoting from commit 0a82a623: In these situations the default N-disk algorithm will present 0-source or 1-source operations to dma devices. To cover for dma devices where the minimum source count is 2 we implement 4-disk and 5-disk handling in the recovery code. The ddf layout presents disks=6 and disks=7 to the recovery code in these situations. Instead of looking at the number of disks count the number of non-zero sources in the list and call the special case code when the number of non-failed sources is 0 or 1. [neilb@suse.de: replace 'ddf' flag with counting good sources] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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