From 8c6bdce0e91425ca5e84f52819b7cf0e024fb129 Mon Sep 17 00:00:00 2001 From: Chi Zhiling Date: Wed, 14 Jan 2026 20:17:47 +0800 Subject: [PATCH] exfat: tweak cluster cache to support zero offset The current cache mechanism does not support reading clusters starting from a file offset of zero. This patch enables that feature in preparation for subsequent reads of contiguous clusters from offset zero. 1. support finding clusters with zero offset. 2. allow clusters with zero offset to be cached. Signed-off-by: Chi Zhiling Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon --- fs/exfat/cache.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/exfat/cache.c b/fs/exfat/cache.c index 025b39b7a9ac..73147e153c2c 100644 --- a/fs/exfat/cache.c +++ b/fs/exfat/cache.c @@ -92,7 +92,7 @@ static unsigned int exfat_cache_lookup(struct inode *inode, spin_lock(&ei->cache_lru_lock); list_for_each_entry(p, &ei->cache_lru, cache_list) { /* Find the cache of "fclus" or nearest cache. */ - if (p->fcluster <= fclus && hit->fcluster < p->fcluster) { + if (p->fcluster <= fclus && hit->fcluster <= p->fcluster) { hit = p; if (hit->fcluster + hit->nr_contig < fclus) { offset = hit->nr_contig; @@ -259,7 +259,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int cluster, if (cluster == 0 || *dclus == EXFAT_EOF_CLUSTER) return 0; - cache_init(&cid, EXFAT_EOF_CLUSTER, EXFAT_EOF_CLUSTER); + cache_init(&cid, fclus, *dclus); exfat_cache_lookup(inode, cluster, &cid, &fclus, dclus); if (fclus == cluster) -- 2.47.3