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-rw-r--r--fs/btrfs/ctree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 49232b526390..e1af5cc698f9 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -718,7 +718,7 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans,
return 0;
}
- search_start = buf->start & ~((u64)SZ_1G - 1);
+ search_start = round_down(buf->start, SZ_1G);
/*
* Before CoWing this block for later modification, check if it's