[v10] erofs: Introduce page cache sharing feature

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

Posted by Hongbo Li 1 month, 2 weeks ago

From: Hongzhen Luo <hongzhen@linux.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@linux.alibaba.com>
Signed-off-by: Hongbo Li <lihongbo22@huawei.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
 	if (sbi->fsid)
 		seq_printf(seq, ",fsid=%s", sbi->fsid);
+#endif
+#if defined(CONFIG_EROFS_FS_ONDEMAND) || defined(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)
 	if (sbi->domain_id)
 		seq_printf(seq, ",domain_id=%s", sbi->domain_id);
 #endif
-- 
2.22.0

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

Posted by Gao Xiang 1 month, 2 weeks ago


On 2025/12/23 09:56, Hongbo Li wrote:
> From: Hongzhen Luo <hongzhen@linux.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@linux.alibaba.com>
> Signed-off-by: Hongbo Li <lihongbo22@huawei.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@linux.alibaba.com>

Thanks,
Gao Xiang