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btrfs: scrub: clean up division in scrub_find_csum

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Use proper helpers for 64bit division.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-03-31 18:02:48 +02:00
parent 7736b0a431
commit 1d1bf92d9d
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/scrub.c
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@ -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) {