[PATCH 2/7] Btrfs: replace BUG_ON with WARN_ONCE in cow_file_range

[Liu Bo <bo.li.liu@oracle.com>]

This BUG_ON is more like a warning since an invalid
btrfs_super_total_bytes() doesn't affect other stuff.

Thus, use WARN_ONCE for warning purpose and don't leave a possible
kernel panic here.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/inode.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2aaba58..5874562 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -974,8 +974,11 @@ static noinline int cow_file_range(struct inode *inode,
 		}
 	}
 
-	BUG_ON(disk_num_bytes >
-	       btrfs_super_total_bytes(root->fs_info->super_copy));
+	WARN_ONCE(disk_num_bytes >
+		  btrfs_super_total_bytes(root->fs_info->super_copy),
+	  KERN_WARNING "disk_num_bytes(%llu) > btrfs_super_total_bytes(%llu)\n",
+		  disk_num_bytes,
+		  btrfs_super_total_bytes(root->fs_info->super_copy));
 
 	alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
 	btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
-- 
2.5.5