Unverified Commit 6a9e2fb1 authored by Christian Brauner's avatar Christian Brauner
Browse files

nsfs: move root inode number to uapi 

Userspace relies on the root inode numbers to identify the initial
namespaces. That's already a hard dependency. So we cannot change that
anymore. Move the initial inode numbers to a public header.

Link: https://github.com/systemd/systemd/commit/d293fade24b34ccc2f5716b0ff5513e9533cf0c4
Link: https://lore.kernel.org/20250606-work-nsfs-v1-1-b8749c9a8844@kernel.org


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 19272b37

include/linux/proc_ns.h

+7 −6
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#define _LINUX_PROC_NS_H



#include <linux/ns_common.h>

#include <uapi/linux/nsfs.h>



struct pid_namespace;

struct nsset;
@@ -40,12 +41,12 @@ extern const struct proc_ns_operations timens_for_children_operations; 
 */

enum {

	PROC_ROOT_INO		= 1,

	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,

	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,

	PROC_USER_INIT_INO	= 0xEFFFFFFDU,

	PROC_PID_INIT_INO	= 0xEFFFFFFCU,

	PROC_CGROUP_INIT_INO	= 0xEFFFFFFBU,

	PROC_TIME_INIT_INO	= 0xEFFFFFFAU,

	PROC_IPC_INIT_INO	= IPC_NS_INIT_INO,

	PROC_UTS_INIT_INO	= UTS_NS_INIT_INO,

	PROC_USER_INIT_INO	= USER_NS_INIT_INO,

	PROC_PID_INIT_INO	= PID_NS_INIT_INO,

	PROC_CGROUP_INIT_INO	= CGROUP_NS_INIT_INO,

	PROC_TIME_INIT_INO	= TIME_NS_INIT_INO,

};



#ifdef CONFIG_PROC_FS

include/uapi/linux/nsfs.h

+9 −0
Original line number Diff line number Diff line
@@ -42,4 +42,13 @@ struct mnt_ns_info { 
/* Get previous namespace. */

#define NS_MNT_GET_PREV		_IOR(NSIO, 12, struct mnt_ns_info)



enum init_ns_ino {

	IPC_NS_INIT_INO		= 0xEFFFFFFFU,

	UTS_NS_INIT_INO		= 0xEFFFFFFEU,

	USER_NS_INIT_INO	= 0xEFFFFFFDU,

	PID_NS_INIT_INO		= 0xEFFFFFFCU,

	CGROUP_NS_INIT_INO	= 0xEFFFFFFBU,

	TIME_NS_INIT_INO	= 0xEFFFFFFAU,

};



#endif /* __LINUX_NSFS_H */