linux-kernel - [PATCH v2 08/13] exfat: reuse cache to improve exfat_get

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Message-ID: <20260108074929.356683-9-chizhiling@163.com>
Date: Thu,  8 Jan 2026 15:49:24 +0800
From: Chi Zhiling <chizhiling@....com>
To: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Namjae Jeon <linkinjeon@...nel.org>,
	Sungjong Seo <sj1557.seo@...sung.com>,
	Yuezhang Mo <yuezhang.mo@...y.com>,
	Chi Zhiling <chizhiling@...inos.cn>
Subject: [PATCH v2 08/13] exfat: reuse cache to improve exfat_get_cluster

From: Chi Zhiling <chizhiling@...inos.cn>

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: Chi Zhiling <chizhiling@...inos.cn>
---
 fs/exfat/cache.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/exfat/cache.c b/fs/exfat/cache.c
index b806e7f5b00f..025b39b7a9ac 100644
--- a/fs/exfat/cache.c
+++ b/fs/exfat/cache.c
@@ -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;
 }
-- 
2.43.0