block: move around bio flagging helpers

We'll need bio_flagged() earlier in bio.h for later patches, move it
together with all related helpers, and mark the bio_flagged()'s bio
argument as const.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

include/linux/bio.h

@@ -46,6 +46,21 @@ static inline unsigned int bio_max_segs(unsigned int nr_segs)
 #define bio_data_dir(bio) \
 	(op_is_write(bio_op(bio)) ? WRITE : READ)
 
+static inline bool bio_flagged(const struct bio *bio, unsigned int bit)
+{
+	return bio->bi_flags & (1U << bit);
+}
+
+static inline void bio_set_flag(struct bio *bio, unsigned int bit)
+{
+	bio->bi_flags |= (1U << bit);
+}
+
+static inline void bio_clear_flag(struct bio *bio, unsigned int bit)
+{
+	bio->bi_flags &= ~(1U << bit);
+}
+
 /*
  * Check whether this bio carries any data or not. A NULL bio is allowed.
  */
@@ -225,21 +240,6 @@ static inline void bio_cnt_set(struct bio *bio, unsigned int count)
 	atomic_set(&bio->__bi_cnt, count);
 }
 
-static inline bool bio_flagged(struct bio *bio, unsigned int bit)
-{
-	return bio->bi_flags & (1U << bit);
-}
-
-static inline void bio_set_flag(struct bio *bio, unsigned int bit)
-{
-	bio->bi_flags |= (1U << bit);
-}
-
-static inline void bio_clear_flag(struct bio *bio, unsigned int bit)
-{
-	bio->bi_flags &= ~(1U << bit);
-}
-
 static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
 {
 	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));