From 1d1bf92d9dee0aeb14dee38151bcf214443f99d5 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 31 Mar 2017 18:02:48 +0200 Subject: [PATCH] btrfs: scrub: clean up division in scrub_find_csum Use proper helpers for 64bit division. Signed-off-by: David Sterba --- fs/btrfs/scrub.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 99f3a7e9eb61..a1b29d581dca 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -2708,7 +2708,9 @@ static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) if (!sum) return 0; - index = ((u32)(logical - sum->bytenr)) / sctx->fs_info->sectorsize; + index = div_u64(logical - sum->bytenr, sctx->fs_info->sectorsize); + ASSERT(index < UINT_MAX); + num_sectors = sum->len / sctx->fs_info->sectorsize; memcpy(csum, sum->sums + index, sctx->csum_size); if (index == num_sectors - 1) { -- 2.20.1