linux-kernel - [PATCH] vfs: use UAPI types for new struct delegation definition

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Message-Id: <20251203-uapi-fcntl-v1-1-490c67bf3425@linutronix.de>
Date: Wed, 03 Dec 2025 14:57:57 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Jeff Layton <jlayton@...nel.org>, Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <alex.aring@...il.com>, Jan Kara <jack@...e.cz>, 
 Christian Brauner <brauner@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, linux-fsdevel@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH] vfs: use UAPI types for new struct delegation definition

Using libc types and headers from the UAPI headers is problematic as it
introduces a dependency on a full C toolchain.

Use the fixed-width integer types provided by the UAPI headers instead.

Fixes: 1602bad16d7d ("vfs: expose delegation support to userland")
Fixes: 4be9e04ebf75 ("vfs: add needed headers for new struct delegation definition")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 include/uapi/linux/fcntl.h | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h
index 5e277fd955aa..aadfbf6e0cb3 100644
--- a/include/uapi/linux/fcntl.h
+++ b/include/uapi/linux/fcntl.h
@@ -4,11 +4,7 @@
 
 #include <asm/fcntl.h>
 #include <linux/openat2.h>
-#ifdef __KERNEL__
 #include <linux/types.h>
-#else
-#include <stdint.h>
-#endif
 
 #define F_SETLEASE	(F_LINUX_SPECIFIC_BASE + 0)
 #define F_GETLEASE	(F_LINUX_SPECIFIC_BASE + 1)
@@ -90,9 +86,9 @@
 
 /* Argument structure for F_GETDELEG and F_SETDELEG */
 struct delegation {
-	uint32_t	d_flags;	/* Must be 0 */
-	uint16_t	d_type;		/* F_RDLCK, F_WRLCK, F_UNLCK */
-	uint16_t	__pad;		/* Must be 0 */
+	__u32	d_flags;	/* Must be 0 */
+	__u16	d_type;		/* F_RDLCK, F_WRLCK, F_UNLCK */
+	__u16	__pad;		/* Must be 0 */
 };
 
 /*

---
base-commit: 3f9f0252130e7dd60d41be0802bf58f6471c691d
change-id: 20251203-uapi-fcntl-f49d5b30f8cd

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>