[PATCH RFC 26/41] xenfs: use fc_init_pseudo()

[Christian Brauner]

Initialize xenfs as a pseudo filesystem. This raises SB_I_PSEUDO and
also SB_I_NOEXEC and SB_I_NODEV. xenfs never holds executables or
device nodes.

SB_I_NOEXEC also refuses PROT_EXEC mappings. xenfs maps the xenstore
page and guest memory through privcmd, both data.

Signed-off-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>
---
 drivers/xen/xenfs/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 37ea7c5c0346..aba7d038ed73 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
+#include <linux/pseudo_fs.h>
 #include <linux/magic.h>
 
 #include <xen/xen.h>
@@ -80,6 +81,7 @@ static const struct fs_context_operations xenfs_context_ops = {
 
 static int xenfs_init_fs_context(struct fs_context *fc)
 {
+	fc_init_pseudo(fc);
 	fc->ops = &xenfs_context_ops;
 	return 0;
 }

-- 
2.53.0