linux-kernel - [RFC PATCH v3 41/59] do_sys_truncate(): switch to CLASS(filename)

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Message-ID: <20251216035518.4037331-42-viro@zeniv.linux.org.uk>
Date: Tue, 16 Dec 2025 03:55:00 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: linux-fsdevel@...r.kernel.org
Cc: torvalds@...ux-foundation.org,
	brauner@...nel.org,
	jack@...e.cz,
	mjguzik@...il.com,
	paul@...l-moore.com,
	axboe@...nel.dk,
	audit@...r.kernel.org,
	io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v3 41/59] do_sys_truncate(): switch to CLASS(filename)

Note that failures from filename_lookup() are final - ESTALE returned
by it means that retry had been done by filename_lookup() and it failed
there.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/open.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index bcaaf884e436..34d9b1ecc141 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -129,25 +129,23 @@ EXPORT_SYMBOL_GPL(vfs_truncate);
 int do_sys_truncate(const char __user *pathname, loff_t length)
 {
 	unsigned int lookup_flags = LOOKUP_FOLLOW;
-	struct filename *name;
 	struct path path;
 	int error;
 
 	if (length < 0)	/* sorry, but loff_t says... */
 		return -EINVAL;
 
-	name = getname(pathname);
+	CLASS(filename, name)(pathname);
 retry:
 	error = filename_lookup(AT_FDCWD, name, lookup_flags, &path, NULL);
 	if (!error) {
 		error = vfs_truncate(&path, length);
 		path_put(&path);
+		if (retry_estale(error, lookup_flags)) {
+			lookup_flags |= LOOKUP_REVAL;
+			goto retry;
+		}
 	}
-	if (retry_estale(error, lookup_flags)) {
-		lookup_flags |= LOOKUP_REVAL;
-		goto retry;
-	}
-	putname(name);
 	return error;
 }
 
-- 
2.47.3