block: better op and flags encoding

Now that we don't need the common flags to overflow outside the range
of a 32-bit type we can encode them the same way for both the bio and
request fields.  This in addition allows us to place the operation
first (and make some room for more ops while we're at it) and to
stop having to shift around the operation values.

In addition this allows passing around only one value in the block layer
instead of two (and eventuall also in the file systems, but we can do
that later) and thus clean up a lot of code.

Last but not least this allows decreasing the size of the cmd_flags
field in struct request to 32-bits.  Various functions passing this
value could also be updated, but I'd like to avoid the churn for now.

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

fs/btrfs/inode.c

@@ -8427,7 +8427,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
 	if (!bio)
 		return -ENOMEM;
 
-	bio_set_op_attrs(bio, bio_op(orig_bio), bio_flags(orig_bio));
+	bio->bi_opf = orig_bio->bi_opf;
 	bio->bi_private = dip;
 	bio->bi_end_io = btrfs_end_dio_bio;
 	btrfs_io_bio(bio)->logical = file_offset;
@@ -8465,8 +8465,7 @@ next_block:
 						  start_sector, GFP_NOFS);
 			if (!bio)
 				goto out_err;
-			bio_set_op_attrs(bio, bio_op(orig_bio),
-					 bio_flags(orig_bio));
+			bio->bi_opf = orig_bio->bi_opf;
 			bio->bi_private = dip;
 			bio->bi_end_io = btrfs_end_dio_bio;
 			btrfs_io_bio(bio)->logical = file_offset;

fs/buffer.c

@@ -3118,7 +3118,7 @@ EXPORT_SYMBOL(submit_bh);
 /**
  * ll_rw_block: low-level access to block devices (DEPRECATED)
  * @op: whether to %READ or %WRITE
- * @op_flags: rq_flag_bits
+ * @op_flags: req_flag_bits
  * @nr: number of &struct buffer_heads in the array
  * @bhs: array of pointers to &struct buffer_head
  *

fs/f2fs/f2fs.h

@@ -688,7 +688,7 @@ struct f2fs_io_info {
 	struct f2fs_sb_info *sbi;	/* f2fs_sb_info pointer */
 	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */
 	int op;			/* contains REQ_OP_ */
-	int op_flags;		/* rq_flag_bits */
+	int op_flags;		/* req_flag_bits */
 	block_t new_blkaddr;	/* new block address to be written */
 	block_t old_blkaddr;	/* old block address before Cow */
 	struct page *page;	/* page to be written */

fs/gfs2/lops.c

@@ -231,7 +231,7 @@ static void gfs2_end_log_write(struct bio *bio)
  * gfs2_log_flush_bio - Submit any pending log bio
  * @sdp: The superblock
  * @op: REQ_OP
- * @op_flags: rq_flag_bits
+ * @op_flags: req_flag_bits
  *
  * Submit any pending part-built or full bio to the block device. If
  * there is no pending bio, then this is a no-op.