Re: [PATCH 1/7] xfs: clean up xfs_attr_node_hasname

[Dave Chinner <david@fromorbit.com>]

On Wed, May 18, 2022 at 11:55:49AM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@kernel.org>
> 
> The calling conventions of this function are a mess -- callers /can/
> provide a pointer to a pointer to a state structure, but it's not
> required, and as evidenced by the last two patches, the callers that do
> weren't be careful enough about how to deal with an existing da state.
> 
> Push the allocation and freeing responsibilty to the callers, which
> means that callers from the xattr node state machine steps now have the
> visibility to allocate or free the da state structure as they please.
> As a bonus, the node remove/add paths for larp-mode replaces can reset
> the da state structure instead of freeing and immediately reallocating
> it.
> 
> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_attr.c     |   63 +++++++++++++++++++++---------------------
>  fs/xfs/libxfs/xfs_da_btree.c |   11 +++++++
>  fs/xfs/libxfs/xfs_da_btree.h |    1 +
>  3 files changed, 44 insertions(+), 31 deletions(-)
> 
> 
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index 576de34cfca0..3838109ef288 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -61,8 +61,8 @@ STATIC void xfs_attr_restore_rmt_blk(struct xfs_da_args *args);
>  static int xfs_attr_node_try_addname(struct xfs_attr_item *attr);
>  STATIC int xfs_attr_node_addname_find_attr(struct xfs_attr_item *attr);
>  STATIC int xfs_attr_node_remove_attr(struct xfs_attr_item *attr);
> -STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
> -				 struct xfs_da_state **state);
> +STATIC int xfs_attr_node_lookup(struct xfs_da_args *args,
> +		struct xfs_da_state *state);
>  
>  int
>  xfs_inode_hasattr(
> @@ -594,6 +594,19 @@ xfs_attr_leaf_mark_incomplete(
>  	return xfs_attr3_leaf_setflag(args);
>  }
>  
> +/* Ensure the da state of an xattr deferred work item is ready to go. */
> +static inline void
> +xfs_attr_item_ensure_da_state(

xfs_attr_item_init_da_state().

Other than that, it's a nice cleanup. I can rename the function
locally if you want.

Reviewed-by: Dave Chinner <dchinner@redhat.com>

-- 
Dave Chinner
david@fromorbit.com