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Date: Mon, 29 Apr 2024 11:25:36 +0200
From: Jan Kara <jack@suse.cz>
To: Zhang Yi <yi.zhang@huaweicloud.com>
Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz,
	yi.zhang@huawei.com, chengzhihao1@huawei.com, yukuai3@huawei.com
Subject: Re: [PATCH v2 6/9] ext4: make ext4_da_reserve_space() reserve
 multi-clusters
Message-ID: <20240429092536.mtlqw4omhc3mrd5g@quack3>
References: <20240410034203.2188357-1-yi.zhang@huaweicloud.com>
 <20240410034203.2188357-7-yi.zhang@huaweicloud.com>
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In-Reply-To: <20240410034203.2188357-7-yi.zhang@huaweicloud.com>

On Wed 10-04-24 11:42:00, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@huawei.com>
> 
> Add 'nr_resv' parameter to ext4_da_reserve_space(), which indicates the
> number of clusters wants to reserve, make it reserve multi-clusters once
> a time.
> 
> Signed-off-by: Zhang Yi <yi.zhang@huawei.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/ext4/inode.c             | 18 +++++++++---------
>  include/trace/events/ext4.h | 10 ++++++----
>  2 files changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index d37233e2ed0b..1180a9eb4362 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1479,9 +1479,9 @@ static int ext4_journalled_write_end(struct file *file,
>  }
>  
>  /*
> - * Reserve space for a single cluster
> + * Reserve space for 'nr_resv' clusters
>   */
> -static int ext4_da_reserve_space(struct inode *inode)
> +static int ext4_da_reserve_space(struct inode *inode, int nr_resv)
>  {
>  	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
>  	struct ext4_inode_info *ei = EXT4_I(inode);
> @@ -1492,18 +1492,18 @@ static int ext4_da_reserve_space(struct inode *inode)
>  	 * us from metadata over-estimation, though we may go over by
>  	 * a small amount in the end.  Here we just reserve for data.
>  	 */
> -	ret = dquot_reserve_block(inode, EXT4_C2B(sbi, 1));
> +	ret = dquot_reserve_block(inode, EXT4_C2B(sbi, nr_resv));
>  	if (ret)
>  		return ret;
>  
>  	spin_lock(&ei->i_block_reservation_lock);
> -	if (ext4_claim_free_clusters(sbi, 1, 0)) {
> +	if (ext4_claim_free_clusters(sbi, nr_resv, 0)) {
>  		spin_unlock(&ei->i_block_reservation_lock);
> -		dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1));
> +		dquot_release_reservation_block(inode, EXT4_C2B(sbi, nr_resv));
>  		return -ENOSPC;
>  	}
> -	ei->i_reserved_data_blocks++;
> -	trace_ext4_da_reserve_space(inode);
> +	ei->i_reserved_data_blocks += nr_resv;
> +	trace_ext4_da_reserve_space(inode, nr_resv);
>  	spin_unlock(&ei->i_block_reservation_lock);
>  
>  	return 0;       /* success */
> @@ -1678,7 +1678,7 @@ static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
>  	 * extents status tree doesn't get a match.
>  	 */
>  	if (sbi->s_cluster_ratio == 1) {
> -		ret = ext4_da_reserve_space(inode);
> +		ret = ext4_da_reserve_space(inode, 1);
>  		if (ret != 0)   /* ENOSPC */
>  			return ret;
>  	} else {   /* bigalloc */
> @@ -1690,7 +1690,7 @@ static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
>  				if (ret < 0)
>  					return ret;
>  				if (ret == 0) {
> -					ret = ext4_da_reserve_space(inode);
> +					ret = ext4_da_reserve_space(inode, 1);
>  					if (ret != 0)   /* ENOSPC */
>  						return ret;
>  				} else {
> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
> index 6b41ac61310f..cc5e9b7b2b44 100644
> --- a/include/trace/events/ext4.h
> +++ b/include/trace/events/ext4.h
> @@ -1246,14 +1246,15 @@ TRACE_EVENT(ext4_da_update_reserve_space,
>  );
>  
>  TRACE_EVENT(ext4_da_reserve_space,
> -	TP_PROTO(struct inode *inode),
> +	TP_PROTO(struct inode *inode, int nr_resv),
>  
> -	TP_ARGS(inode),
> +	TP_ARGS(inode, nr_resv),
>  
>  	TP_STRUCT__entry(
>  		__field(	dev_t,	dev			)
>  		__field(	ino_t,	ino			)
>  		__field(	__u64,	i_blocks		)
> +		__field(	int,	reserve_blocks		)
>  		__field(	int,	reserved_data_blocks	)
>  		__field(	__u16,  mode			)
>  	),
> @@ -1262,16 +1263,17 @@ TRACE_EVENT(ext4_da_reserve_space,
>  		__entry->dev	= inode->i_sb->s_dev;
>  		__entry->ino	= inode->i_ino;
>  		__entry->i_blocks = inode->i_blocks;
> +		__entry->reserve_blocks = nr_resv;
>  		__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
>  		__entry->mode	= inode->i_mode;
>  	),
>  
> -	TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu "
> +	TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu reserve_blocks %d"
>  		  "reserved_data_blocks %d",
>  		  MAJOR(__entry->dev), MINOR(__entry->dev),
>  		  (unsigned long) __entry->ino,
>  		  __entry->mode, __entry->i_blocks,
> -		  __entry->reserved_data_blocks)
> +		  __entry->reserve_blocks, __entry->reserved_data_blocks)
>  );
>  
>  TRACE_EVENT(ext4_da_release_space,
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR