9p: explicitly deny setlease attempts

[ 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>

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index be5768949cb15eeab32623f122cb6bbf21791697..5d92eaeaebd910d0f5d8cacbb3eee3cb8bda8969 100644 (file)
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -685,6 +685,7 @@ 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 = {
@@ -726,4 +727,5 @@ 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,
 };