linux-kernel - [PATCH 1/2] configfs: Add CONFIGFS_ATTR

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Message-ID: <20250420104726.2963750-1-richard@nod.at>
Date: Sun, 20 Apr 2025 12:47:25 +0200
From: Richard Weinberger <richard@....at>
To: linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	a.hindborg@...nel.org,
	leitao@...ian.org,
	kch@...dia.com,
	sagi@...mberg.me,
	hch@....de,
	upstream+nvme@...ma-star.at,
	Richard Weinberger <richard@....at>
Subject: [PATCH 1/2] configfs: Add CONFIGFS_ATTR_PERM helper

This new helper allows creating rw files with custom
permissions.

Signed-off-by: Richard Weinberger <richard@....at>
---
 include/linux/configfs.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index c771e9d0d0b9..698520b1bfdb 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -120,15 +120,19 @@ struct configfs_attribute {
 	ssize_t (*store)(struct config_item *, const char *, size_t);
 };
 
-#define CONFIGFS_ATTR(_pfx, _name)			\
+#define CONFIGFS_ATTR_PERM(_pfx, _name, _perm)		\
 static struct configfs_attribute _pfx##attr_##_name = {	\
 	.ca_name	= __stringify(_name),		\
-	.ca_mode	= S_IRUGO | S_IWUSR,		\
+	.ca_mode	= _perm,			\
 	.ca_owner	= THIS_MODULE,			\
 	.show		= _pfx##_name##_show,		\
 	.store		= _pfx##_name##_store,		\
 }
 
+#define CONFIGFS_ATTR(_pfx, _name) CONFIGFS_ATTR_PERM(	\
+		_pfx, _name, S_IRUGO | S_IWUSR		\
+)
+
 #define CONFIGFS_ATTR_RO(_pfx, _name)			\
 static struct configfs_attribute _pfx##attr_##_name = {	\
 	.ca_name	= __stringify(_name),		\
-- 
2.48.1