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Re: [PATCH 009/119] xfs: convert list of extents to free into a regular

To: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Subject: Re: [PATCH 009/119] xfs: convert list of extents to free into a regular list
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 17 Jun 2016 04:59:30 -0700
Cc: david@xxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, vishal.l.verma@xxxxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <146612632997.12839.18026491074892368053.stgit@xxxxxxxxxxxxxxxx>
References: <146612627129.12839.3827886950949809165.stgit@xxxxxxxxxxxxxxxx> <146612632997.12839.18026491074892368053.stgit@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.24 (2015-08-30)
>  {
> +     struct xfs_bmap_free_item       *new;           /* new element */
>  #ifdef DEBUG
>       xfs_agnumber_t          agno;
>       xfs_agblock_t           agbno;
> @@ -597,17 +595,7 @@ xfs_bmap_add_free(
>       new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
>       new->xbfi_startblock = bno;
>       new->xbfi_blockcount = (xfs_extlen_t)len;
> +     list_add(&new->xbfi_list, &flist->xbf_flist);
>       flist->xbf_count++;

Please kill xbf_count while you're at it, it's entirely superflous.

> @@ -617,14 +605,10 @@ xfs_bmap_add_free(
>   */
>  void
>  xfs_bmap_del_free(
> -     xfs_bmap_free_t         *flist, /* free item list header */
> -     xfs_bmap_free_item_t    *prev,  /* previous item on list, if any */
> -     xfs_bmap_free_item_t    *free)  /* list item to be freed */
> +     struct xfs_bmap_free            *flist, /* free item list header */
> +     struct xfs_bmap_free_item       *free)  /* list item to be freed */

Which then also gets rid of the flist argument here.

> @@ -634,17 +618,16 @@ xfs_bmap_del_free(
>   */
>  void
>  xfs_bmap_cancel(
> +     struct xfs_bmap_free            *flist) /* list of bmap_free_items */
>  {
> +     struct xfs_bmap_free_item       *free;  /* free list item */
>  
>       if (flist->xbf_count == 0)
>               return;
> +     while (!list_empty(&flist->xbf_flist)) {
> +             free = list_first_entry(&flist->xbf_flist,
> +                             struct xfs_bmap_free_item, xbfi_list);

        while ((free = list_first_entry_or_null(...))

> +     list_sort((*tp)->t_mountp, &flist->xbf_flist, xfs_bmap_free_list_cmp);

Can you add a comment on why we are sorting the list?

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