bcache: remove the cache_dev_name field from struct cache

Just use the %pg format specifier to print the name directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20211020143812.6403-6-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/bcache.h

@@ -470,8 +470,6 @@ struct cache {
 	atomic_long_t		meta_sectors_written;
 	atomic_long_t		btree_sectors_written;
 	atomic_long_t		sectors_written;
-
-	char			cache_dev_name[BDEVNAME_SIZE];
 };
 
 struct gc_stat {

drivers/md/bcache/io.c

@@ -123,13 +123,13 @@ void bch_count_io_errors(struct cache *ca,
 		errors >>= IO_ERROR_SHIFT;
 
 		if (errors < ca->set->error_limit)
-			pr_err("%s: IO error on %s%s\n",
-			       ca->cache_dev_name, m,
+			pr_err("%pg: IO error on %s%s\n",
+			       ca->bdev, m,
 			       is_read ? ", recovering." : ".");
 		else
 			bch_cache_set_error(ca->set,
-					    "%s: too many IO errors %s\n",
-					    ca->cache_dev_name, m);
+					    "%pg: too many IO errors %s\n",
+					    ca->bdev, m);
 	}
 }
 

drivers/md/bcache/super.c

@@ -2338,7 +2338,7 @@ err_btree_alloc:
 err_free:
 	module_put(THIS_MODULE);
 	if (err)
-		pr_notice("error %s: %s\n", ca->cache_dev_name, err);
+		pr_notice("error %pg: %s\n", ca->bdev, err);
 	return ret;
 }
 
@@ -2348,7 +2348,6 @@ static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
 	const char *err = NULL; /* must be set for any error case */
 	int ret = 0;
 
-	bdevname(bdev, ca->cache_dev_name);
 	memcpy(&ca->sb, sb, sizeof(struct cache_sb));
 	ca->bdev = bdev;
 	ca->bdev->bd_holder = ca;
@@ -2390,14 +2389,14 @@ static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
 		goto out;
 	}
 
-	pr_info("registered cache device %s\n", ca->cache_dev_name);
+	pr_info("registered cache device %pg\n", ca->bdev);
 
 out:
 	kobject_put(&ca->kobj);
 
 err:
 	if (err)
-		pr_notice("error %s: %s\n", ca->cache_dev_name, err);
+		pr_notice("error %pg: %s\n", ca->bdev, err);
 
 	return ret;
 }