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H A Draid56.cdiff 46900662d02f416fc49d21a4fe816df4b6507db1 Fri Apr 01 13:23:22 CEST 2022 Qu Wenruo <wqu@suse.com> btrfs: raid56: make finish_parity_scrub() subpage compatible

The core is to convert direct page usage into sector_ptr usage, and
use memcpy() to replace copy_page().

For pointers usage, we need to convert it to kmap_local_page() +
sector->pgoff.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>