From 452452beb88f93d280c6b6540fd434f98930eab6 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 9 May 2015 22:09:14 -0500 Subject: sysctl: Allow creating permanently empty directories that serve as mountpoints. commit f9bd6733d3f11e24f3949becf277507d422ee1eb upstream. Add a magic sysctl table sysctl_mount_point that when used to create a directory forces that directory to be permanently empty. Update the code to use make_empty_dir_inode when accessing permanently empty directories. Update the code to not allow adding to permanently empty directories. Update /proc/sys/fs/binfmt_misc to be a permanently empty directory. Signed-off-by: "Eric W. Biederman" Signed-off-by: Luis Henriques --- include/linux/sysctl.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux/sysctl.h') diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index 14a8ff2de11e..07e597b8802f 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -190,6 +190,9 @@ struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, void unregister_sysctl_table(struct ctl_table_header * table); extern int sysctl_init(void); + +extern struct ctl_table sysctl_mount_point[]; + #else /* CONFIG_SYSCTL */ static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table) { -- cgit v1.2.3