fs/xfs: Use the enum req_op and blk_opf_t types

Improve static type checking by using the enum req_op type for variables
that represent a request operation and the new blk_opf_t type for the
combination of a request operation with request flags.
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-63-bvanassche@acm.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

fs/xfs/xfs_bio_io.c

@@ -15,7 +15,7 @@ xfs_rw_bdev(
 	sector_t		sector,
 	unsigned int		count,
 	char			*data,
-	unsigned int		op)
+	enum req_op		op)
 
 {
 	unsigned int		is_vmalloc = is_vmalloc_addr(data);

fs/xfs/xfs_buf.c

@@ -1416,7 +1416,7 @@ xfs_buf_ioapply_map(
 	int		map,
 	int		*buf_offset,
 	int		*count,
-	int		op)
+	blk_opf_t	op)
 {
 	int		page_index;
 	unsigned int	total_nr_pages = bp->b_page_count;
@@ -1493,7 +1493,7 @@ _xfs_buf_ioapply(
 	struct xfs_buf	*bp)
 {
 	struct blk_plug	plug;
-	int		op;
+	blk_opf_t	op;
 	int		offset;
 	int		size;
 	int		i;

fs/xfs/xfs_linux.h

@@ -196,7 +196,7 @@ static inline uint64_t howmany_64(uint64_t x, uint32_t y)
 }
 
 int xfs_rw_bdev(struct block_device *bdev, sector_t sector, unsigned int count,
-		char *data, unsigned int op);
+		char *data, enum req_op op);
 
 #define ASSERT_ALWAYS(expr)	\
 	(likely(expr) ? (void)0 : assfail(NULL, #expr, __FILE__, __LINE__))

fs/xfs/xfs_log_recover.c

@@ -122,7 +122,7 @@ xlog_do_io(
 	xfs_daddr_t		blk_no,
 	unsigned int		nbblks,
 	char			*data,
-	unsigned int		op)
+	enum req_op		op)
 {
 	int			error;