Commit 6d0b7f87 authored by Chi Zhiling's avatar Chi Zhiling Committed by Namjae Jeon
Browse files

exfat: reuse cache to improve exfat_get_cluster 



Since exfat_ent_get supports cache buffer head, we can use this option to
reduce sb_bread calls when fetching consecutive entries.

Signed-off-by: default avatarChi Zhiling <chizhiling@kylinos.cn>
Reviewed-by: default avatarYuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent afb6ffa3

fs/exfat/cache.c

+3 −1
Original line number Diff line number Diff line
@@ -238,6 +238,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int cluster, 
{

	struct super_block *sb = inode->i_sb;

	struct exfat_inode_info *ei = EXFAT_I(inode);

	struct buffer_head *bh = NULL;

	struct exfat_cache_id cid;

	unsigned int content, fclus;
@@ -265,7 +266,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int cluster, 
		return 0;



	while (fclus < cluster) {

		if (exfat_ent_get(sb, *dclus, &content, NULL))

		if (exfat_ent_get(sb, *dclus, &content, &bh))

			return -EIO;



		*last_dclus = *dclus;
@@ -279,6 +280,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int cluster, 
			cache_init(&cid, fclus, *dclus);

	}



	brelse(bh);

	exfat_cache_add(inode, &cid);

	return 0;

}