f2fs: change seq_file_ra_mul and max_io_bytes to unsigned int

{struct file_ra_state}->ra_pages and {struct bio}->bi_iter.bi_size is
defined as unsigned int, so values of seq_file_ra_mul and max_io_bytes
exceeding UINT_MAX are meaningless.

Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Yongpeng Yang

fs/f2fs/f2fs.h

@@ -1808,7 +1808,7 @@ struct f2fs_sb_info {
 	unsigned int total_valid_node_count;	/* valid node block count */
 	int dir_level;				/* directory level */
 	bool readdir_ra;			/* readahead inode in readdir */
-	u64 max_io_bytes;			/* max io bytes to merge IOs */
+	unsigned int max_io_bytes;		/* max io bytes to merge IOs */
 
 	block_t user_block_count;		/* # of user blocks */
 	block_t total_valid_block_count;	/* # of valid blocks */
@@ -1956,7 +1956,7 @@ struct f2fs_sb_info {
 	unsigned int gc_segment_mode;		/* GC state for reclaimed segments */
 	unsigned int gc_reclaimed_segs[MAX_GC_MODE];	/* Reclaimed segs for each mode */
 
-	unsigned long seq_file_ra_mul;		/* multiplier for ra_pages of seq. files in fadvise */
+	unsigned int seq_file_ra_mul;		/* multiplier for ra_pages of seq. files in fadvise */
 
 	int max_fragment_chunk;			/* max chunk size for block fragmentation mode */
 	int max_fragment_hole;			/* max hole size for block fragmentation mode */