linux-kernel - Re: [PATCH v10 06/10] erofs: support domain-specific page cache share

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Message-ID: <94872052-84c3-4163-9bea-3ec9d5778b23@linux.alibaba.com>
Date: Tue, 23 Dec 2025 15:25:30 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Hongbo Li <lihongbo22@...wei.com>
Cc: linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>,
 Christian Brauner <brauner@...nel.org>, "Darrick J. Wong"
 <djwong@...nel.org>, Amir Goldstein <amir73il@...il.com>,
 Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v10 06/10] erofs: support domain-specific page cache share



On 2025/12/23 09:56, Hongbo Li wrote:
> From: Hongzhen Luo <hongzhen@...ux.alibaba.com>
> 
> Only files in the same domain will share the page cache. Also modify
> the sysfs related content in preparation for the upcoming page cache
> share feature.
> 
> Signed-off-by: Hongzhen Luo <hongzhen@...ux.alibaba.com>
> Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
> ---
>   fs/erofs/super.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 68480f10e69d..be9f96252c6c 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -518,6 +518,8 @@ static int erofs_fc_parse_param(struct fs_context *fc,
>   		if (!sbi->fsid)
>   			return -ENOMEM;
>   		break;
> +#endif
> +#if defined(CONFIG_EROFS_FS_ONDEMAND) || defined(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)
>   	case Opt_domain_id:
>   		kfree(sbi->domain_id);
>   		sbi->domain_id = kstrdup(param->string, GFP_KERNEL);
> @@ -618,7 +620,7 @@ static void erofs_set_sysfs_name(struct super_block *sb)
>   {
>   	struct erofs_sb_info *sbi = EROFS_SB(sb);
>   
> -	if (sbi->domain_id)
> +	if (sbi->domain_id && !erofs_sb_has_ishare_xattrs(sbi))
>   		super_set_sysfs_name_generic(sb, "%s,%s", sbi->domain_id,
>   					     sbi->fsid);
>   	else if (sbi->fsid)
> @@ -1052,6 +1054,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
>   #ifdef CONFIG_EROFS_FS_ONDEMAND

here.

>   	if (sbi->fsid)
>   		seq_printf(seq, ",fsid=%s", sbi->fsid);
> +#endif
> +#if defined(CONFIG_EROFS_FS_ONDEMAND) || defined(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)

I think we could just kill these `#if` entirely since
`sbi->domain_id` and `sbi->fsid` are defined
unconditionally.

Otherwise it looks good to me:
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Thanks,
Gao Xiang