[PATCH 6.1 133/236] 9p: explicitly deny setlease attempts

Greg Kroah-Hartman
2024-05-14T11:33:44Z

From: Jeff Layton <jlayton@kernel.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@kernel.org>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 aec43ba837992..87222067fe5de 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -667,6 +667,7 @@ const struct file_operations v9fs_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fsync = v9fs_file_fsync,
+ .setlease = simple_nosetlease,
};

const struct file_operations v9fs_file_operations_dotl = {
@@ -708,4 +709,5 @@ const struct file_operations v9fs_mmap_file_operations_dotl = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fsync = v9fs_file_fsync_dotl,
+ .setlease = simple_nosetlease,
};
--
2.43.0