linux-kernel - [PATCH v5 05/68] allow to use CLASS() for struct filename *

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Message-ID: <20260114043310.3885463-6-viro@zeniv.linux.org.uk>
Date: Wed, 14 Jan 2026 04:32:07 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: linux-fsdevel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Mateusz Guzik <mjguzik@...il.com>,
	Paul Moore <paul@...l-moore.com>,
	Jens Axboe <axboe@...nel.dk>,
	audit@...r.kernel.org,
	io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v5 05/68] allow to use CLASS() for struct filename *

Not all users match that model, but most of them do.  By the end of
the series we'll be left with very few irregular ones...

Added:
CLASS(filename, name)(user_path) =>
	getname(user_path)
CLASS(filename_kernel, name)(string) =>
	getname_kernel(string)
CLASS(filename_flags, name)(user_path, flags) =>
	getname_flags(user_path, flags)
CLASS(filename_uflags, name)(user_path, flags) =>
	getname_uflags(user_path, flags)
CLASS(filename_maybe_null, name)(user_path, flags) =>
	getname_maybe_null(user_path, flags)
all with putname() as destructor.

"flags" in filename_flags is in LOOKUP_... space, only LOOKUP_EMPTY matters.
"flags" in filename_uflags and filename_maybe_null is in AT_...... space,
and only AT_EMPTY_PATH matters.

filename_flags conventions might be worth reconsidering later (it might or
might not be better off with boolean instead)

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 include/linux/fs.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index f5c9cf28c4dc..d49b969ab432 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2517,6 +2517,12 @@ static inline struct filename *refname(struct filename *name)
 	return name;
 }
 
+DEFINE_CLASS(filename, struct filename *, putname(_T), getname(p), const char __user *p)
+EXTEND_CLASS(filename, _kernel, getname_kernel(p), const char *p)
+EXTEND_CLASS(filename, _flags, getname_flags(p, f), const char __user *p, unsigned int f)
+EXTEND_CLASS(filename, _uflags, getname_uflags(p, f), const char __user *p, unsigned int f)
+EXTEND_CLASS(filename, _maybe_null, getname_maybe_null(p, f), const char __user *p, unsigned int f)
+
 extern int finish_open(struct file *file, struct dentry *dentry,
 			int (*open)(struct inode *, struct file *));
 extern int finish_no_open(struct file *file, struct dentry *dentry);
-- 
2.47.3