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_
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#define _NAMESPACE_H_
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#ifdef __KERNEL__
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#include <linux/mount.h>
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#include <linux/sched.h>
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#include <linux/nsproxy.h>
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struct namespace {
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atomic_t count;
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struct vfsmount * root;
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struct list_head list;
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wait_queue_head_t poll;
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int event;
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};
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extern int copy_namespace(int, struct task_struct *);
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extern void __put_namespace(struct namespace *namespace);
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extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
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static inline void put_namespace(struct namespace *namespace)
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{
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if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
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/* releases vfsmount_lock */
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__put_namespace(namespace);
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}
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static inline void exit_namespace(struct task_struct *p)
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{
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struct namespace *namespace = p->nsproxy->namespace;
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if (namespace) {
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put_namespace(namespace);
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}
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}
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static inline void get_namespace(struct namespace *namespace)
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{
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atomic_inc(&namespace->count);
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}
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#endif
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#endif
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