Re: [PATCH 09/17] xfs: refactor xfs_bmap_add_extent_hole_delay

[Brian Foster <bfoster@redhat.com>]

On Sun, Sep 03, 2017 at 09:29:48AM +0200, Christoph Hellwig wrote:
> Use xfs_iext_get_extent to find, and xfs_iext_update_extent to update
> entries in the in-core extent list.  This isolates the function from
> the detailed layout of the extent list, and generally makes the code
> a lot more readable.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/libxfs/xfs_bmap.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
> index c15b81611403..eae66f7999c8 100644
> --- a/fs/xfs/libxfs/xfs_bmap.c
> +++ b/fs/xfs/libxfs/xfs_bmap.c
> @@ -2701,7 +2701,7 @@ xfs_bmap_add_extent_hole_delay(
>  	xfs_filblks_t		oldlen=0;	/* old indirect size */
>  	xfs_bmbt_irec_t		right;	/* right neighbor extent entry */
>  	int			state;  /* state bits, accessed thru macros */
> -	xfs_filblks_t		temp=0;	/* temp for indirect calculations */
> +	xfs_filblks_t		temp;	 /* temp for indirect calculations */
>  
>  	ifp = XFS_IFORK_PTR(ip, whichfork);
>  	state = 0;
> @@ -2764,14 +2764,14 @@ xfs_bmap_add_extent_hole_delay(
>  			right.br_blockcount;
>  
>  		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
> -		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
>  		oldlen = startblockval(left.br_startblock) +
>  			startblockval(new->br_startblock) +
>  			startblockval(right.br_startblock);
>  		newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
>  					 oldlen);
> -		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
> -			nullstartblock((int)newlen));
> +		left.br_startblock = nullstartblock(newlen);
> +		left.br_blockcount = temp;
> +		xfs_iext_update_extent(ifp, *idx, &left);
>  		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
>  
>  		xfs_iext_remove(ip, *idx + 1, 1, state);
> @@ -2787,13 +2787,13 @@ xfs_bmap_add_extent_hole_delay(
>  		temp = left.br_blockcount + new->br_blockcount;
>  
>  		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
> -		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
>  		oldlen = startblockval(left.br_startblock) +
>  			startblockval(new->br_startblock);
>  		newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
>  					 oldlen);
> -		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
> -			nullstartblock((int)newlen));
> +		left.br_blockcount = temp;
> +		left.br_startblock = nullstartblock(newlen);
> +		xfs_iext_update_extent(ifp, *idx, &left);
>  		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
>  		break;
>  
> @@ -2809,9 +2809,10 @@ xfs_bmap_add_extent_hole_delay(
>  			startblockval(right.br_startblock);
>  		newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
>  					 oldlen);
> -		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
> -			new->br_startoff,
> -			nullstartblock((int)newlen), temp, right.br_state);
> +		right.br_startoff = new->br_startoff;
> +		right.br_startblock = nullstartblock(newlen);
> +		right.br_blockcount = temp;
> +		xfs_iext_update_extent(ifp, *idx, &right);
>  		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
>  		break;
>  
> -- 
> 2.11.0
> 
> --
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