mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-02 13:56:41 +07:00
1651e14e28
This moves the mount namespace into the nsproxy. The mount namespace count now refers to the number of nsproxies point to it, rather than the number of tasks. As a result, the unshare_namespace() function in kernel/fork.c no longer checks whether it is being shared. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Andrey Savochkin <saw@sw.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
43 lines
930 B
C
43 lines
930 B
C
#ifndef _NAMESPACE_H_
|
|
#define _NAMESPACE_H_
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/mount.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/nsproxy.h>
|
|
|
|
struct namespace {
|
|
atomic_t count;
|
|
struct vfsmount * root;
|
|
struct list_head list;
|
|
wait_queue_head_t poll;
|
|
int event;
|
|
};
|
|
|
|
extern int copy_namespace(int, struct task_struct *);
|
|
extern void __put_namespace(struct namespace *namespace);
|
|
extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
|
|
|
|
static inline void put_namespace(struct namespace *namespace)
|
|
{
|
|
if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
|
|
/* releases vfsmount_lock */
|
|
__put_namespace(namespace);
|
|
}
|
|
|
|
static inline void exit_namespace(struct task_struct *p)
|
|
{
|
|
struct namespace *namespace = p->nsproxy->namespace;
|
|
if (namespace) {
|
|
put_namespace(namespace);
|
|
}
|
|
}
|
|
|
|
static inline void get_namespace(struct namespace *namespace)
|
|
{
|
|
atomic_inc(&namespace->count);
|
|
}
|
|
|
|
#endif
|
|
#endif
|