Commit a105bb88 authored by Ilya Dryomov's avatar Ilya Dryomov Committed by Chris Mason

Btrfs: fix a regression in balance usage filter

Commit 3fed40cc ("Btrfs: cleanup duplicated division functions"), which
was merged into 3.8-rc1, has introduced a regression by removing logic
that was guarding us against bad user input.  Bring it back.
Signed-off-by: default avatarIlya Dryomov <>
Signed-off-by: default avatarChris Mason <>
parent 83bfccb5
......@@ -2614,7 +2614,14 @@ static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
cache = btrfs_lookup_block_group(fs_info, chunk_offset);
chunk_used = btrfs_block_group_used(&cache->item);
user_thresh = div_factor_fine(cache->key.offset, bargs->usage);
if (bargs->usage == 0)
user_thresh = 0;
else if (bargs->usage > 100)
user_thresh = cache->key.offset;
user_thresh = div_factor_fine(cache->key.offset,
if (chunk_used < user_thresh)
ret = 0;
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