linux-ext4 - Re: [PATCH v6 02/12] xfs: add helpers to compute log item overhead

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Message-ID: <Z_WoUawfJ_QFF5kP@dread.disaster.area>
Date: Wed, 9 Apr 2025 08:50:57 +1000
From: Dave Chinner <david@...morbit.com>
To: John Garry <john.g.garry@...cle.com>
Cc: brauner@...nel.org, djwong@...nel.org, hch@....de,
	viro@...iv.linux.org.uk, jack@...e.cz, cem@...nel.org,
	linux-fsdevel@...r.kernel.org, dchinner@...hat.com,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	ojaswin@...ux.ibm.com, ritesh.list@...il.com,
	martin.petersen@...cle.com, linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org, catherine.hoang@...cle.com
Subject: Re: [PATCH v6 02/12] xfs: add helpers to compute log item overhead

On Tue, Apr 08, 2025 at 10:41:59AM +0000, John Garry wrote:
> From: "Darrick J. Wong" <djwong@...nel.org>
> 
> Add selected helpers to estimate the transaction reservation required to
> write various log intent and buffer items to the log.  These helpers
> will be used by the online repair code for more precise estimations of
> how much work can be done in a single transaction.
> 
> Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
> Signed-off-by: John Garry <john.g.garry@...cle.com>
> ---
>  fs/xfs/libxfs/xfs_trans_resv.c |  6 +++---
>  fs/xfs/libxfs/xfs_trans_resv.h |  4 ++++
>  fs/xfs/xfs_bmap_item.c         | 10 ++++++++++
>  fs/xfs/xfs_bmap_item.h         |  3 +++
>  fs/xfs/xfs_buf_item.c          | 19 +++++++++++++++++++
>  fs/xfs/xfs_buf_item.h          |  3 +++
>  fs/xfs/xfs_extfree_item.c      | 10 ++++++++++
>  fs/xfs/xfs_extfree_item.h      |  3 +++
>  fs/xfs/xfs_log_cil.c           |  4 +---
>  fs/xfs/xfs_log_priv.h          | 13 +++++++++++++
>  fs/xfs/xfs_refcount_item.c     | 10 ++++++++++
>  fs/xfs/xfs_refcount_item.h     |  3 +++
>  fs/xfs/xfs_rmap_item.c         | 10 ++++++++++
>  fs/xfs/xfs_rmap_item.h         |  3 +++
>  14 files changed, 95 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c
> index 13d00c7166e1..ce1393bd3561 100644
> --- a/fs/xfs/libxfs/xfs_trans_resv.c
> +++ b/fs/xfs/libxfs/xfs_trans_resv.c
> @@ -47,7 +47,7 @@ xfs_buf_log_overhead(void)
>   * will be changed in a transaction.  size is used to tell how many
>   * bytes should be reserved per item.
>   */
> -STATIC uint
> +uint
>  xfs_calc_buf_res(
>  	uint		nbufs,
>  	uint		size)
> @@ -84,7 +84,7 @@ xfs_allocfree_block_count(
>   * in the same transaction as an allocation or a free, so we compute them
>   * separately.
>   */
> -static unsigned int
> +unsigned int
>  xfs_refcountbt_block_count(
>  	struct xfs_mount	*mp,
>  	unsigned int		num_ops)
> @@ -129,7 +129,7 @@ xfs_rtrefcountbt_block_count(
>   *	  additional to the records and pointers that fit inside the inode
>   *	  forks.
>   */
> -STATIC uint
> +uint
>  xfs_calc_inode_res(
>  	struct xfs_mount	*mp,
>  	uint			ninodes)
> diff --git a/fs/xfs/libxfs/xfs_trans_resv.h b/fs/xfs/libxfs/xfs_trans_resv.h
> index 0554b9d775d2..e76052028cc9 100644
> --- a/fs/xfs/libxfs/xfs_trans_resv.h
> +++ b/fs/xfs/libxfs/xfs_trans_resv.h
> @@ -97,6 +97,10 @@ struct xfs_trans_resv {
>  
>  void xfs_trans_resv_calc(struct xfs_mount *mp, struct xfs_trans_resv *resp);
>  uint xfs_allocfree_block_count(struct xfs_mount *mp, uint num_ops);
> +unsigned int xfs_refcountbt_block_count(struct xfs_mount *mp,
> +		unsigned int num_ops);
> +uint xfs_calc_buf_res(uint nbufs, uint size);
> +uint xfs_calc_inode_res(struct xfs_mount *mp, uint ninodes);

Why are these exported? They aren't used in this patch, and any code
that doing calculate log reservation calculation should really be
placed in xfs_trans_resv.c along with all the existing log
reservation calculations...

-Dave
-- 
Dave Chinner
david@...morbit.com