linux-ext4 - Re: [RFC PATCH v2 01/25] ext4: refactor ext4_da_map

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Date: Wed, 3 Jan 2024 10:56:30 +0100
From: Jan Kara <jack@...e.cz>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
	ritesh.list@...il.com, hch@...radead.org, djwong@...nel.org,
	willy@...radead.org, yi.zhang@...wei.com, chengzhihao1@...wei.com,
	yukuai3@...wei.com, wangkefeng.wang@...wei.com
Subject: Re: [RFC PATCH v2 01/25] ext4: refactor ext4_da_map_blocks()

On Tue 02-01-24 20:38:54, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
> 
> Refactor and cleanup ext4_da_map_blocks(), reduce some unnecessary
> parameters and branches, no logic changes.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/inode.c | 39 +++++++++++++++++----------------------
>  1 file changed, 17 insertions(+), 22 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 61277f7f8722..5b0d3075be12 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1704,7 +1704,6 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
>  	/* Lookup extent status tree firstly */
>  	if (ext4_es_lookup_extent(inode, iblock, NULL, &es)) {
>  		if (ext4_es_is_hole(&es)) {
> -			retval = 0;
>  			down_read(&EXT4_I(inode)->i_data_sem);
>  			goto add_delayed;
>  		}
> @@ -1749,26 +1748,9 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
>  		retval = ext4_ext_map_blocks(NULL, inode, map, 0);
>  	else
>  		retval = ext4_ind_map_blocks(NULL, inode, map, 0);
> -
> -add_delayed:
> -	if (retval == 0) {
> -		int ret;
> -
> -		/*
> -		 * XXX: __block_prepare_write() unmaps passed block,
> -		 * is it OK?
> -		 */
> -
> -		ret = ext4_insert_delayed_block(inode, map->m_lblk);
> -		if (ret != 0) {
> -			retval = ret;
> -			goto out_unlock;
> -		}
> -
> -		map_bh(bh, inode->i_sb, invalid_block);
> -		set_buffer_new(bh);
> -		set_buffer_delay(bh);
> -	} else if (retval > 0) {
> +	if (retval < 0)
> +		goto out_unlock;
> +	if (retval > 0) {
>  		unsigned int status;
>  
>  		if (unlikely(retval != map->m_len)) {
> @@ -1783,11 +1765,24 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
>  				EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
>  		ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
>  				      map->m_pblk, status);
> +		goto out_unlock;
>  	}
>  
> +add_delayed:
> +	/*
> +	 * XXX: __block_prepare_write() unmaps passed block,
> +	 * is it OK?
> +	 */
> +	retval = ext4_insert_delayed_block(inode, map->m_lblk);
> +	if (retval)
> +		goto out_unlock;
> +
> +	map_bh(bh, inode->i_sb, invalid_block);
> +	set_buffer_new(bh);
> +	set_buffer_delay(bh);
> +
>  out_unlock:
>  	up_read((&EXT4_I(inode)->i_data_sem));
> -
>  	return retval;
>  }
>  
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR