btrfs: split btrfs_direct_IO to read and write
The read and write DIO don't have anything in common except for the call to iomap_dio_rw. Extract the write call into a new function to get rid of conditional statements for direct write. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com>
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