btrfs: raid56: extract the rmw bio list build code into a helper

The helper will later be used to refactor the whole RMW path.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-11-01 19:16:06 +08:00 • committed by David Sterba
commit 509c27aa2f