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nsfs: move root inode number to uapi

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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: d293fade24
Link: https://lore.kernel.org/20250606-work-nsfs-v1-1-b8749c9a8844@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-06-06 11:45:07 +02:00
parent 19272b37aa
commit 6a9e2fb1ba
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 16 additions and 6 deletions
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13
include/linux/proc_ns.h
View File

@ -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

9
include/uapi/linux/nsfs.h
View File

@ -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 */