block: Use sysfs_emit in sysfs show functions

index 079057ab535a..7148d5bc37d9 100644
@@ -8,6 +8,7 @@
 #include <linux/major.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/sysfs.h>
 #include <linux/ctype.h>
 #include <linux/vmalloc.h>
 #include <linux/raid/detect.h>

@@ -177,31 +178,31 @@ static struct parsed_partitions *check_partition(struct gendisk *hd)
 static ssize_t part_partition_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", bdev_partno(dev_to_bdev(dev)));
+	return sysfs_emit(buf, "%d\n", bdev_partno(dev_to_bdev(dev)));
 }
 
 static ssize_t part_start_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect);
+	return sysfs_emit(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect);
 }
 
 static ssize_t part_ro_show(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", bdev_read_only(dev_to_bdev(dev)));
+	return sysfs_emit(buf, "%d\n", bdev_read_only(dev_to_bdev(dev)));
 }
 
 static ssize_t part_alignment_offset_show(struct device *dev,
 					  struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%u\n", bdev_alignment_offset(dev_to_bdev(dev)));
+	return sysfs_emit(buf, "%u\n", bdev_alignment_offset(dev_to_bdev(dev)));
 }
 
 static ssize_t part_discard_alignment_show(struct device *dev,
 					   struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%u\n", bdev_discard_alignment(dev_to_bdev(dev)));
+	return sysfs_emit(buf, "%u\n", bdev_discard_alignment(dev_to_bdev(dev)));
 }
 
 static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);