linux-kernel - [PATCH RFC v7 3/7] erofs: support domain-specific page cache share

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Message-ID: <20251021104815.70662-4-lihongbo22@huawei.com>
Date: Tue, 21 Oct 2025 10:48:11 +0000
From: Hongbo Li <lihongbo22@...wei.com>
To: <hsiangkao@...ux.alibaba.com>, <chao@...nel.org>, <brauner@...nel.org>,
	<hongzhen@...ux.alibaba.com>
CC: <linux-erofs@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<lihongbo22@...wei.com>
Subject: [PATCH RFC v7 3/7] erofs: support domain-specific page cache share

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>
[hongbo: forward port, minor fixes]
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 283449024996..93cc24542405 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -515,6 +515,8 @@ 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_INODE_SHARE)
 	case Opt_domain_id:
 		kfree(sbi->domain_id);
 		sbi->domain_id = kstrdup(param->string, GFP_KERNEL);
@@ -615,7 +617,7 @@ 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 && !sbi->ishare_key)
 		super_set_sysfs_name_generic(sb, "%s,%s", sbi->domain_id,
 					     sbi->fsid);
 	else if (sbi->fsid)
@@ -1032,6 +1034,8 @@ 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_INODE_SHARE)
 	if (sbi->domain_id)
 		seq_printf(seq, ",domain_id=%s", sbi->domain_id);
 #endif
-- 
2.22.0