linux-kernel - [PATCH AUTOSEL 5.4 3/8] 9p: explicitly deny setlease attempts

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Message-ID: <20240423110304.1659456-3-sashal@kernel.org>
Date: Tue, 23 Apr 2024 07:02:58 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jeff Layton <jlayton@...nel.org>,
	Eric Van Hensbergen <ericvh@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	lucho@...kov.net,
	asmadeus@...ewreck.org,
	v9fs@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.4 3/8] 9p: explicitly deny setlease attempts

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit 7a84602297d36617dbdadeba55a2567031e5165b ]

9p is a remote network protocol, and it doesn't support asynchronous
notifications from the server. Ensure that we don't hand out any leases
since we can't guarantee they'll be broken when a file's contents
change.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Eric Van Hensbergen <ericvh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/9p/vfs_file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index ee9cabac12041..14d6cb0316212 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -676,6 +676,7 @@ const struct file_operations v9fs_file_operations = {
 	.lock = v9fs_file_lock,
 	.mmap = generic_file_readonly_mmap,
 	.fsync = v9fs_file_fsync,
+	.setlease = simple_nosetlease,
 };
 
 const struct file_operations v9fs_file_operations_dotl = {
@@ -711,4 +712,5 @@ const struct file_operations v9fs_mmap_file_operations_dotl = {
 	.flock = v9fs_file_flock_dotl,
 	.mmap = v9fs_mmap_file_mmap,
 	.fsync = v9fs_file_fsync_dotl,
+	.setlease = simple_nosetlease,
 };
-- 
2.43.0