On 19.07.2018 17:49, Josef Bacik wrote:
> From: Josef Bacik <jbacik@xxxxxx>
>
> We do this dance in cleanup_ref_head and check_ref_cleanup, unify it
> into a helper and cleanup the calling functions.
>
> Signed-off-by: Josef Bacik <jbacik@xxxxxx>
> ---
> fs/btrfs/delayed-ref.c | 14 ++++++++++++++
> fs/btrfs/delayed-ref.h | 3 ++-
> fs/btrfs/extent-tree.c | 24 ++++--------------------
> 3 files changed, 20 insertions(+), 21 deletions(-)
>
> diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
> index 03dec673d12a..e1b322d651dd 100644
> --- a/fs/btrfs/delayed-ref.c
> +++ b/fs/btrfs/delayed-ref.c
> @@ -393,6 +393,20 @@ btrfs_select_ref_head(struct btrfs_trans_handle *trans)
> return head;
> }
>
> +void btrfs_delete_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
> + struct btrfs_delayed_ref_head *head)
> +{
> + lockdep_assert_held(&delayed_refs->lock);
> + lockdep_assert_held(&head->lock);
> +
> + rb_erase(&head->href_node, &delayed_refs->href_root);
> + RB_CLEAR_NODE(&head->href_node);
> + atomic_dec(&delayed_refs->num_entries);
> + delayed_refs->num_heads--;
> + if (head->processing == 0)
> + delayed_refs->num_heads_ready--;
> +}
> +
> /*
> * Helper to insert the ref_node to the tail or merge with tail.
> *
> diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
> index ea1aecb6a50d..36318182e4ec 100644
> --- a/fs/btrfs/delayed-ref.h
> +++ b/fs/btrfs/delayed-ref.h
> @@ -263,7 +263,8 @@ static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head)
> {
> mutex_unlock(&head->mutex);
> }
> -
> +void btrfs_delete_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
> + struct btrfs_delayed_ref_head *head);
>
> struct btrfs_delayed_ref_head *
> btrfs_select_ref_head(struct btrfs_trans_handle *trans);
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 3d9fe58c0080..ccaccd78534e 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -2577,12 +2577,9 @@ static int cleanup_ref_head(struct btrfs_trans_handle *trans,
> spin_unlock(&delayed_refs->lock);
> return 1;
> }
> - delayed_refs->num_heads--;
> - rb_erase(&head->href_node, &delayed_refs->href_root);
> - RB_CLEAR_NODE(&head->href_node);
> - spin_unlock(&head->lock);
> + btrfs_delete_ref_head(delayed_refs, head);
> spin_unlock(&delayed_refs->lock);
> - atomic_dec(&delayed_refs->num_entries);
> + spin_unlock(&head->lock);
>
> trace_run_delayed_ref_head(fs_info, head, 0);
>
> @@ -7122,22 +7119,9 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
> if (!mutex_trylock(&head->mutex))
> goto out;
>
> - /*
> - * at this point we have a head with no other entries. Go
> - * ahead and process it.
> - */
> - rb_erase(&head->href_node, &delayed_refs->href_root);
> - RB_CLEAR_NODE(&head->href_node);
> - atomic_dec(&delayed_refs->num_entries);
> -
> - /*
> - * we don't take a ref on the node because we're removing it from the
> - * tree, so we just steal the ref the tree was holding.
> - */
> - delayed_refs->num_heads--;
> - if (head->processing == 0)
> - delayed_refs->num_heads_ready--;
In cleanup_ref_head we don't have the num_heads_ready-- code so this is
not pure consolidation but changes the behavior to a certain extent. It
seems this patch is also fixing a bug w.r.t num_heads_ready counts if
so, this needs to be documented in the changelog.
> + btrfs_delete_ref_head(delayed_refs, head);
> head->processing = 0;
> +
> spin_unlock(&head->lock);
> spin_unlock(&delayed_refs->lock);
>
>
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