0f2452855d
This is based on a patch by Eric W. Biederman, who pointed out that pid namespaces are still fake, and we only have one ever active. So for the time being, we can modify any code which could access tsk->nsproxy->pid_ns during task exit to just use &init_pid_ns instead, and move the exit_task_namespaces call in do_exit() back above exit_notify(), so that an exiting nfs server has a valid tsk->sighand to work with. Long term, pulling pid_ns out of nsproxy might be the cleanest solution. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> [ Eric's patch fixed to take care of free_pid() too ] Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
45 lines
943 B
C
45 lines
943 B
C
#ifndef _LINUX_PID_NS_H
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#define _LINUX_PID_NS_H
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/threads.h>
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#include <linux/pid.h>
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#include <linux/nsproxy.h>
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#include <linux/kref.h>
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struct pidmap {
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atomic_t nr_free;
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void *page;
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};
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#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
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struct pid_namespace {
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struct kref kref;
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struct pidmap pidmap[PIDMAP_ENTRIES];
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int last_pid;
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struct task_struct *child_reaper;
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};
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extern struct pid_namespace init_pid_ns;
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static inline void get_pid_ns(struct pid_namespace *ns)
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{
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kref_get(&ns->kref);
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}
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extern int copy_pid_ns(int flags, struct task_struct *tsk);
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extern void free_pid_ns(struct kref *kref);
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static inline void put_pid_ns(struct pid_namespace *ns)
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{
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kref_put(&ns->kref, free_pid_ns);
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}
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static inline struct task_struct *child_reaper(struct task_struct *tsk)
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{
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return init_pid_ns.child_reaper;
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}
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#endif /* _LINUX_PID_NS_H */
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