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authorDavid Sterba <dsterba@suse.com>2017-03-31 18:02:48 +0200
committerDavid Sterba <dsterba@suse.com>2017-08-21 17:47:42 +0200
commit1d1bf92d9dee0aeb14dee38151bcf214443f99d5 (patch)
tree197e67e5b9ce6f925bb76b156010f5015c7d0b9d
parent7736b0a4313c936dc8ccb87e8acf447e12ae2fd1 (diff)
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btrfs: scrub: clean up division in scrub_find_csum
Use proper helpers for 64bit division. Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--fs/btrfs/scrub.c4
1 files changed, 3 insertions, 1 deletions
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) {