block, fs: move submit_bio to bio.h

This is where all the other bio operations live, so users must include
bio.h anyway.

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

include/linux/bio.h

@@ -404,6 +404,8 @@ static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
 
 }
 
+extern blk_qc_t submit_bio(struct bio *);
+
 extern void bio_endio(struct bio *);
 
 static inline void bio_io_error(struct bio *bio)

include/linux/fs.h

@@ -2717,7 +2717,6 @@ static inline void remove_inode_hash(struct inode *inode)
 extern void inode_sb_list_add(struct inode *inode);
 
 #ifdef CONFIG_BLOCK
-extern blk_qc_t submit_bio(struct bio *);
 extern int bdev_read_only(struct block_device *);
 #endif
 extern int set_blocksize(struct block_device *, int);