block: remove BIO_PAGE_REFFED

Now that all block direct I/O helpers use page pinning, this flag is
unused.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20230614140341.521331-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/blk.h

@@ -445,8 +445,6 @@ static inline void bio_release_page(struct bio *bio, struct page *page)
 {
 	if (bio_flagged(bio, BIO_PAGE_PINNED))
 		unpin_user_page(page);
-	else if (bio_flagged(bio, BIO_PAGE_REFFED))
-		put_page(page);
 }
 
 struct request_queue *blk_alloc_queue(int node_id);

include/linux/bio.h

@@ -492,8 +492,7 @@ void zero_fill_bio(struct bio *bio);
 
 static inline void bio_release_pages(struct bio *bio, bool mark_dirty)
 {
-	if (bio_flagged(bio, BIO_PAGE_REFFED) ||
-	    bio_flagged(bio, BIO_PAGE_PINNED))
+	if (bio_flagged(bio, BIO_PAGE_PINNED))
 		__bio_release_pages(bio, mark_dirty);
 }
 

include/linux/blk_types.h

@@ -326,7 +326,6 @@ struct bio {
  */
 enum {
 	BIO_PAGE_PINNED,	/* Unpin pages in bio_release_pages() */
-	BIO_PAGE_REFFED,	/* put pages in bio_release_pages() */
 	BIO_CLONED,		/* doesn't own data */
 	BIO_BOUNCED,		/* bio is a bounce bio */
 	BIO_QUIET,		/* Make BIO Quiet */