From 684b290abc774202ff88897648f24520f40c916b Mon Sep 17 00:00:00 2001
From: Huang Xiaojia <huangxiaojia2@huawei.com>
Date: Sat, 20 Jul 2024 16:23:35 +0800
Subject: [PATCH] erofs: add support for FS_IOC_GETFSSYSFSPATH
FS_IOC_GETFSSYSFSPATH ioctl exposes /sys/fs path of a given filesystem,
potentially standarizing sysfs reporting. This patch add support for
FS_IOC_GETFSSYSFSPATH for erofs, "erofs/<dev>" will be outputted for bdev
cases, "erofs/[domain_id,]<fs_id>" will be outputted for fscache cases.
Signed-off-by: Huang Xiaojia <huangxiaojia2@huawei.com>
Link: https://lore.kernel.org/r/20240720082335.441563-1-huangxiaojia2@huawei.com
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---
fs/erofs/super.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 35268263aaed9..32ce5b35e1dff 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -576,6 +576,21 @@ static const struct export_operations erofs_export_ops = {
.get_parent = erofs_get_parent,
};
+static void erofs_set_sysfs_name(struct super_block *sb)
+{
+ struct erofs_sb_info *sbi = EROFS_SB(sb);
+
+ if (erofs_is_fscache_mode(sb)) {
+ if (sbi->domain_id)
+ super_set_sysfs_name_generic(sb, "%s,%s",sbi->domain_id,
+ sbi->fsid);
+ else
+ super_set_sysfs_name_generic(sb, "%s", sbi->fsid);
+ return;
+ }
+ super_set_sysfs_name_id(sb);
+}
+
static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
@@ -643,6 +658,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_flags |= SB_POSIXACL;
else
sb->s_flags &= ~SB_POSIXACL;
+ erofs_set_sysfs_name(sb);
#ifdef CONFIG_EROFS_FS_ZIP
xa_init(&sbi->managed_pslots);
--
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