From: Hyeongseok Kim hyeongseok@gmail.com
commit 77edfc6e51055b61cae2f54c8e6c3bb7c762e4fe upstream.
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 Signed-off-by: Namjae Jeon namjae.jeon@samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/exfat/balloc.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-)
--- a/fs/exfat/balloc.c +++ b/fs/exfat/balloc.c @@ -141,10 +141,6 @@ void exfat_free_bitmap(struct exfat_sb_i 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 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 *in 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) {