On 22.12.2017 00:42, Liu Bo wrote:
> This is a subtle case, so in order to understand the problem, it'd be good to
> know the content of existing and em when any error occurs.
>
> Signed-off-by: Liu Bo <bo.li....@oracle.com>
> ---
> fs/btrfs/extent_map.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
> index d386cfb..a8b7e24 100644
> --- a/fs/btrfs/extent_map.c
> +++ b/fs/btrfs/extent_map.c
> @@ -550,17 +550,23 @@ int btrfs_add_extent_mapping(struct extent_map_tree
> *em_tree,
> *em_in = existing;
> ret = 0;
> } else {
> + u64 orig_start = em->start;
> + u64 orig_len = em->len;
> +
> /*
> * The existing extent map is the one nearest to
> * the [start, start + len) range which overlaps
> */
> ret = merge_extent_mapping(em_tree, existing,
> em, start, len);
> - free_extent_map(existing);
> if (ret) {
> free_extent_map(em);
> *em_in = NULL;
> + WARN_ONCE(ret, KERN_INFO "Unexpected error %d:
> merge existing(start %llu len %llu) with em(start %llu len %llu)\n",
I think this KERN_INFO is spurious and should be removed?
> + ret, existing->start, existing->len,
> + orig_start, orig_len);
> }
> + free_extent_map(existing);
> }
> }
>
>
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