dm/dm-zoned: Use the enum req_op type

Improve static type checking by using the enum req_op type for arguments
that represent a request operation.
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-31-bvanassche@acm.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/dm-zoned-metadata.c

@@ -737,7 +737,7 @@ static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk,
 /*
  * Read/write a metadata block.
  */
-static int dmz_rdwr_block(struct dmz_dev *dev, int op,
+static int dmz_rdwr_block(struct dmz_dev *dev, enum req_op op,
 			  sector_t block, struct page *page)
 {
 	struct bio *bio;
@@ -2045,7 +2045,8 @@ struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
  * allocated and used to map the chunk.
  * The zone returned will be set to the active state.
  */
-struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op)
+struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
+				      unsigned int chunk, enum req_op op)
 {
 	struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
 	struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;

drivers/md/dm-zoned.h

@@ -248,7 +248,7 @@ struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
 					 unsigned int dev_idx, bool idle);
 
 struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
-				      unsigned int chunk, int op);
+				      unsigned int chunk, enum req_op op);
 void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *zone);
 struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
 				     struct dm_zone *dzone);