block: remove the CONFIG_BLOCK ifdef in blk_types.h

Now that we have a separate header for struct bio_vec there is absolutely
no excuse for including this header from non-block I/O code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

include/linux/blk_types.h

@@ -17,7 +17,6 @@ struct io_context;
 struct cgroup_subsys_state;
 typedef void (bio_end_io_t) (struct bio *);
 
-#ifdef CONFIG_BLOCK
 /*
  * main unit of I/O for the block layer and lower layers (ie drivers and
  * stacking drivers)
@@ -126,8 +125,6 @@ struct bio {
 #define BVEC_POOL_OFFSET	(16 - BVEC_POOL_BITS)
 #define BVEC_POOL_IDX(bio)	((bio)->bi_flags >> BVEC_POOL_OFFSET)
 
-#endif /* CONFIG_BLOCK */
-
 /*
  * Operations and flags common to the bio and request structures.
  * We use 8 bits for encoding the operation, and the remaining 24 for flags.