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exfat: tweak cluster cache to support zero offset

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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 <chizhiling@kylinos.cn>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Chi Zhiling
2026-01-14 20:17:47 +08:00
committed by Namjae Jeon
parent 256694b22d
commit 8c6bdce0e9
1 changed files with 2 additions and 2 deletions
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4
fs/exfat/cache.c
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@@ -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)