If mounted with discard option, exFAT issues discard command when clear cluster bit to remove file. But the input parameter of cluster-to-sector calculation is abnormally added by reserved cluster size which is 2, leading to discard unrelated sectors included in target+2 cluster. With fixing this, remove the wrong comments in set/clear/find bitmap functions.

Fixes: 1e49a94cf707 ("exfat: add bitmap operations")

Cc: stable@vger.kernel.org # v5.7+

Signed-off-by: Hyeongseok Kim hyeongseok@gmail.com Acked-by: Sungjong Seo sj1557.seo@samsung.com

Applied. Thanks for your patch!

---

fs/exfat/balloc.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/fs/exfat/balloc.c b/fs/exfat/balloc.c index 761c79c3a4ba..54f1bcbddb26 100644 --- a/fs/exfat/balloc.c +++ b/fs/exfat/balloc.c @@ -141,10 +141,6 @@ void exfat_free_bitmap(struct exfat_sb_info *sbi) kfree(sbi->vol_amap); }

-/*

• • If the value of "clu" is 0, it means cluster 2 which is the first cluster of
• • the cluster heap.
• */

int exfat_set_bitmap(struct inode *inode, unsigned int clu) { int i, b; @@ -162,10 +158,6 @@ int exfat_set_bitmap(struct inode *inode, unsigned int clu) return 0; }

-/*

• • If the value of "clu" is 0, it means cluster 2 which is the first cluster of
• • the cluster heap.
• */

void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync) { int i, b; @@ -186,8 +178,7 @@ void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync) int ret_discard;

ret_discard = sb_issue_discard(sb,

• 	exfat_cluster_to_sector(sbi, clu +
  

• 				EXFAT_RESERVED_CLUSTERS),
  

• 	exfat_cluster_to_sector(sbi, clu),
  (1 << sbi->sect_per_clus_bits), GFP_NOFS, 0);
  
  

  if (ret_discard == -EOPNOTSUPP) {

@@ -197,10 +188,6 @@ void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync) } }

-/*

• • If the value of "clu" is 0, it means cluster 2 which is the first cluster of
• • the cluster heap.
• */

unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu) { unsigned int i, map_i, map_b, ent_idx; -- 2.27.0.83.g0313f36