block, drivers, fs: shrink bi_rw from long to int
We don't need bi_rw to be so large on 64 bit archs, so reduce it to unsigned int. Signed-off-by: NMike Christie <mchristi@redhat.com> Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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