btrfs: split btrfs_submit_data_bio to read and write parts
Split btrfs_submit_data_bio into one helper for reads and one for writes. 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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