[PATCH RFC 05/41] kernfs: use fc_init_pseudo()

[Christian Brauner <brauner@xxxxxxxxxx>]

Initialize all kernfs based filesystems as pseudo filesystems in
kernfs_get_tree() instead of raising SB_I_NOEXEC and SB_I_NODEV by hand
in kernfs_fill_super(). This adds SB_I_PSEUDO for sysfs, cgroupfs and
resctrl.

Signed-off-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>
---
 fs/kernfs/mount.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index a0be784bfb06..6b60d212b003 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/pseudo_fs.h>
 #include <linux/mount.h>
 #include <linux/init.h>
 #include <linux/magic.h>
@@ -298,8 +299,6 @@ static int kernfs_fill_super(struct super_block *sb, struct 
kernfs_fs_context *k
        struct dentry *root;
 
        info->sb = sb;
-       /* Userspace would break if executables or devices appear on sysfs */
-       sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV;
        sb->s_blocksize = PAGE_SIZE;
        sb->s_blocksize_bits = PAGE_SHIFT;
        sb->s_magic = kfc->magic;
@@ -388,6 +387,7 @@ int kernfs_get_tree(struct fs_context *fc)
        info->ns = kfc->ns_tag;
        INIT_LIST_HEAD(&info->node);
 
+       fc_init_pseudo(fc);
        fc->s_fs_info = info;
        sb = sget_fc(fc, kernfs_test_super, kernfs_set_super);
        if (IS_ERR(sb))

-- 
2.53.0