Use ASSERT to report logical error in cow_file_range(), also move
it a bit closer to when the num_bytes is derived.

Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 fs/btrfs/inode.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4b156e191592..5648c4425f1e 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -976,6 +976,8 @@ static noinline int cow_file_range(struct inode *inode,
 
        num_bytes = ALIGN(end - start + 1, blocksize);
        num_bytes = max(blocksize,  num_bytes);
+       ASSERT(!(num_bytes >
+                btrfs_super_total_bytes(fs_info->super_copy)));
 
        inode_should_defrag(BTRFS_I(inode), start, end, num_bytes, SZ_64K);
 
@@ -1006,9 +1008,6 @@ static noinline int cow_file_range(struct inode *inode,
                }
        }
 
-       BUG_ON(num_bytes >
-              btrfs_super_total_bytes(fs_info->super_copy));
-
        alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
        btrfs_drop_extent_cache(BTRFS_I(inode), start,
                        start + num_bytes - 1, 0);
-- 
2.15.0

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