btrfs: raid56: wait for I/O completion in submit_read_bios
In addition to setting up the end_io handler and submitting the bios in submit_read_bios, also wait for them to be completed instead of waiting for the completion manually in all three callers. Rename submit_read_bios to submit_read_wait_bio_list to make it clear it waits for the bios as well. Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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