brd: fix aligned_sector from brd_do_discard()

The calculation is just wrong, fix it by round_up().

Fixes: 9ead7efc6f3f ("brd: implement discard support")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250506061756.2970934-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index fc793d48a9c633910871bb390ebf2fd393643038..2753fb21410b350c473ea2f21e2bf0af0847255e 100644 (file)
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -166,7 +166,7 @@ static void brd_free_one_page(struct rcu_head *head)
 
 static void brd_do_discard(struct brd_device *brd, sector_t sector, u32 size)
 {
-       sector_t aligned_sector = (sector + PAGE_SECTORS) & ~PAGE_SECTORS;
+       sector_t aligned_sector = round_up(sector, PAGE_SECTORS);
        struct page *page;
 
        size -= (aligned_sector - sector) * SECTOR_SIZE;