Re: [PATCH v2 11/15] xfs: use internal dfops during [b|c]ui recovery

[Bill O'Donnell <billodo@redhat.com>]

On Mon, Jul 23, 2018 at 09:04:10AM -0400, Brian Foster wrote:
> bmap and refcount intent processing associates a dfops from the
> caller with a local transaction to collect all deferred items for
> post-processing. Use the internal dfops in both of these functions
> and move the deferred items to the parent dfops before the
> transaction commits.
> 
> Signed-off-by: Brian Foster <bfoster@redhat.com>

Looks good.
Reviewed-by: Bill O'Donnell <billodo@redhat.com>

> ---
>  fs/xfs/xfs_bmap_item.c     | 21 +++++++++++----------
>  fs/xfs/xfs_log_recover.c   |  6 +++---
>  fs/xfs/xfs_refcount_item.c | 30 ++++++++++++++++--------------
>  3 files changed, 30 insertions(+), 27 deletions(-)
> 
> diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
> index 478bfc798861..bc5eb2e0ab0c 100644
> --- a/fs/xfs/xfs_bmap_item.c
> +++ b/fs/xfs/xfs_bmap_item.c
> @@ -441,7 +441,12 @@ xfs_bui_recover(
>  			XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
>  	if (error)
>  		return error;
> -	tp->t_dfops = dfops;
> +	/*
> +	 * Recovery stashes all deferred ops during intent processing and
> +	 * finishes them on completion. Transfer current dfops state to this
> +	 * transaction and transfer the result back before we return.
> +	 */
> +	xfs_defer_move(tp->t_dfops, dfops);
>  	budp = xfs_trans_get_bud(tp, buip);
>  
>  	/* Grab the inode. */
> @@ -470,7 +475,7 @@ xfs_bui_recover(
>  	xfs_trans_ijoin(tp, ip, 0);
>  
>  	count = bmap->me_len;
> -	error = xfs_trans_log_finish_bmap_update(tp, budp, dfops, type,
> +	error = xfs_trans_log_finish_bmap_update(tp, budp, tp->t_dfops, type,
>  			ip, whichfork, bmap->me_startoff,
>  			bmap->me_startblock, &count, state);
>  	if (error)
> @@ -482,18 +487,14 @@ xfs_bui_recover(
>  		irec.br_blockcount = count;
>  		irec.br_startoff = bmap->me_startoff;
>  		irec.br_state = state;
> -		error = xfs_bmap_unmap_extent(tp->t_mountp, dfops, ip, &irec);
> +		error = xfs_bmap_unmap_extent(tp->t_mountp, tp->t_dfops, ip,
> +					      &irec);
>  		if (error)
>  			goto err_inode;
>  	}
>  
>  	set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
> -	/*
> -	 * Recovery finishes all deferred ops once intent processing is
> -	 * complete. Reset the trans reference because commit expects a finished
> -	 * dfops or none at all.
> -	 */
> -	tp->t_dfops = NULL;
> +	xfs_defer_move(dfops, tp->t_dfops);
>  	error = xfs_trans_commit(tp);
>  	xfs_iunlock(ip, XFS_ILOCK_EXCL);
>  	IRELE(ip);
> @@ -501,7 +502,7 @@ xfs_bui_recover(
>  	return error;
>  
>  err_inode:
> -	tp->t_dfops = NULL;
> +	xfs_defer_move(dfops, tp->t_dfops);
>  	xfs_trans_cancel(tp);
>  	if (ip) {
>  		xfs_iunlock(ip, XFS_ILOCK_EXCL);
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index 3289811eb076..958e9b96dc6a 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -4854,10 +4854,10 @@ xlog_finish_defer_ops(
>  			0, XFS_TRANS_RESERVE, &tp);
>  	if (error)
>  		return error;
> -	/* dfops is already populated so assign it manually */
> -	tp->t_dfops = dfops;
> +	/* transfer all collected dfops to this transaction */
> +	xfs_defer_move(tp->t_dfops, dfops);
>  
> -	error = xfs_defer_finish(&tp, dfops);
> +	error = xfs_defer_finish(&tp, tp->t_dfops);
>  	if (error)
>  		goto out_cancel;
>  
> diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
> index 2064c689bc72..d3582a06626f 100644
> --- a/fs/xfs/xfs_refcount_item.c
> +++ b/fs/xfs/xfs_refcount_item.c
> @@ -452,7 +452,12 @@ xfs_cui_recover(
>  			mp->m_refc_maxlevels * 2, 0, XFS_TRANS_RESERVE, &tp);
>  	if (error)
>  		return error;
> -	tp->t_dfops = dfops;
> +	/*
> +	 * Recovery stashes all deferred ops during intent processing and
> +	 * finishes them on completion. Transfer current dfops state to this
> +	 * transaction and transfer the result back before we return.
> +	 */
> +	xfs_defer_move(tp->t_dfops, dfops);
>  	cudp = xfs_trans_get_cud(tp, cuip);
>  
>  	for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
> @@ -474,8 +479,8 @@ xfs_cui_recover(
>  			new_len = refc->pe_len;
>  		} else
>  			error = xfs_trans_log_finish_refcount_update(tp, cudp,
> -				dfops, type, refc->pe_startblock, refc->pe_len,
> -				&new_fsb, &new_len, &rcur);
> +				tp->t_dfops, type, refc->pe_startblock,
> +				refc->pe_len, &new_fsb, &new_len, &rcur);
>  		if (error)
>  			goto abort_error;
>  
> @@ -486,21 +491,23 @@ xfs_cui_recover(
>  			switch (type) {
>  			case XFS_REFCOUNT_INCREASE:
>  				error = xfs_refcount_increase_extent(
> -						tp->t_mountp, dfops, &irec);
> +						tp->t_mountp, tp->t_dfops,
> +						&irec);
>  				break;
>  			case XFS_REFCOUNT_DECREASE:
>  				error = xfs_refcount_decrease_extent(
> -						tp->t_mountp, dfops, &irec);
> +						tp->t_mountp, tp->t_dfops,
> +						&irec);
>  				break;
>  			case XFS_REFCOUNT_ALLOC_COW:
>  				error = xfs_refcount_alloc_cow_extent(
> -						tp->t_mountp, dfops,
> +						tp->t_mountp, tp->t_dfops,
>  						irec.br_startblock,
>  						irec.br_blockcount);
>  				break;
>  			case XFS_REFCOUNT_FREE_COW:
>  				error = xfs_refcount_free_cow_extent(
> -						tp->t_mountp, dfops,
> +						tp->t_mountp, tp->t_dfops,
>  						irec.br_startblock,
>  						irec.br_blockcount);
>  				break;
> @@ -515,18 +522,13 @@ xfs_cui_recover(
>  
>  	xfs_refcount_finish_one_cleanup(tp, rcur, error);
>  	set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
> -	/*
> -	 * Recovery finishes all deferred ops once intent processing is
> -	 * complete. Reset the trans reference because commit expects a finished
> -	 * dfops or none at all.
> -	 */
> -	tp->t_dfops = NULL;
> +	xfs_defer_move(dfops, tp->t_dfops);
>  	error = xfs_trans_commit(tp);
>  	return error;
>  
>  abort_error:
>  	xfs_refcount_finish_one_cleanup(tp, rcur, error);
> -	tp->t_dfops = NULL;
> +	xfs_defer_move(dfops, tp->t_dfops);
>  	xfs_trans_cancel(tp);
>  	return error;
>  }
> -- 
> 2.17.1
> 
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