From: "Serge E. Hallyn" This patch adds a nsproxy structure to the task struct. Later patches will move the fs namespace pointer into this structure, and introduce a new utsname namespace into the nsproxy. The vserver and openvz functionality, then, would be implemented in large part by virtualizing/isolating more and more resources into namespaces, each contained in the nsproxy. Signed-off-by: Serge Hallyn Cc: Kirill Korotaev Cc: "Eric W. Biederman" Cc: Herbert Poetzl Cc: Andrey Savochkin Signed-off-by: Andrew Morton --- arch/alpha/kernel/init_task.c | 2 arch/arm/kernel/init_task.c | 2 arch/arm26/kernel/init_task.c | 2 arch/frv/kernel/init_task.c | 2 arch/h8300/kernel/init_task.c | 2 arch/i386/kernel/init_task.c | 2 arch/ia64/kernel/init_task.c | 2 arch/m32r/kernel/init_task.c | 2 arch/m68knommu/kernel/init_task.c | 2 arch/mips/kernel/init_task.c | 2 arch/parisc/kernel/init_task.c | 2 arch/powerpc/kernel/init_task.c | 2 arch/s390/kernel/init_task.c | 2 arch/sh/kernel/init_task.c | 2 arch/sh64/kernel/init_task.c | 2 arch/sparc/kernel/init_task.c | 2 arch/sparc64/kernel/init_task.c | 2 arch/um/kernel/init_task.c | 2 arch/v850/kernel/init_task.c | 2 arch/x86_64/kernel/init_task.c | 2 include/linux/init_task.h | 7 ++ include/linux/nsproxy.h | 45 ++++++++++++++++ include/linux/sched.h | 2 kernel/Makefile | 2 kernel/exit.c | 7 ++ kernel/fork.c | 18 ++++++ kernel/nsproxy.c | 78 ++++++++++++++++++++++++++++ 27 files changed, 197 insertions(+), 2 deletions(-) diff -puN arch/alpha/kernel/init_task.c~namespaces-add-nsproxy arch/alpha/kernel/init_task.c --- a/arch/alpha/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/alpha/kernel/init_task.c @@ -5,6 +5,7 @@ #include #include #include +#include #include @@ -13,6 +14,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); struct task_struct init_task = INIT_TASK(init_task); EXPORT_SYMBOL(init_mm); diff -puN arch/arm26/kernel/init_task.c~namespaces-add-nsproxy arch/arm26/kernel/init_task.c --- a/arch/arm26/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/arm26/kernel/init_task.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -20,6 +21,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/arm/kernel/init_task.c~namespaces-add-nsproxy arch/arm/kernel/init_task.c --- a/arch/arm/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/arm/kernel/init_task.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -17,6 +18,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/frv/kernel/init_task.c~namespaces-add-nsproxy arch/frv/kernel/init_task.c --- a/arch/frv/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/frv/kernel/init_task.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -15,6 +16,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/h8300/kernel/init_task.c~namespaces-add-nsproxy arch/h8300/kernel/init_task.c --- a/arch/h8300/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/h8300/kernel/init_task.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -17,6 +18,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/i386/kernel/init_task.c~namespaces-add-nsproxy arch/i386/kernel/init_task.c --- a/arch/i386/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/i386/kernel/init_task.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -15,6 +16,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/ia64/kernel/init_task.c~namespaces-add-nsproxy arch/ia64/kernel/init_task.c --- a/arch/ia64/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/ia64/kernel/init_task.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -21,6 +22,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/m32r/kernel/init_task.c~namespaces-add-nsproxy arch/m32r/kernel/init_task.c --- a/arch/m32r/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/m32r/kernel/init_task.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -16,6 +17,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/m68knommu/kernel/init_task.c~namespaces-add-nsproxy arch/m68knommu/kernel/init_task.c --- a/arch/m68knommu/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/m68knommu/kernel/init_task.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -17,6 +18,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/mips/kernel/init_task.c~namespaces-add-nsproxy arch/mips/kernel/init_task.c --- a/arch/mips/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/mips/kernel/init_task.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include @@ -14,6 +15,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/parisc/kernel/init_task.c~namespaces-add-nsproxy arch/parisc/kernel/init_task.c --- a/arch/parisc/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/parisc/kernel/init_task.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -38,6 +39,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/powerpc/kernel/init_task.c~namespaces-add-nsproxy arch/powerpc/kernel/init_task.c --- a/arch/powerpc/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/powerpc/kernel/init_task.c @@ -5,6 +5,7 @@ #include #include #include +#include #include static struct fs_struct init_fs = INIT_FS; @@ -12,6 +13,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/s390/kernel/init_task.c~namespaces-add-nsproxy arch/s390/kernel/init_task.c --- a/arch/s390/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/s390/kernel/init_task.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -20,6 +21,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/sh64/kernel/init_task.c~namespaces-add-nsproxy arch/sh64/kernel/init_task.c --- a/arch/sh64/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/sh64/kernel/init_task.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -23,6 +24,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); struct pt_regs fake_swapper_regs; diff -puN arch/sh/kernel/init_task.c~namespaces-add-nsproxy arch/sh/kernel/init_task.c --- a/arch/sh/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/sh/kernel/init_task.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include @@ -12,6 +13,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/sparc64/kernel/init_task.c~namespaces-add-nsproxy arch/sparc64/kernel/init_task.c --- a/arch/sparc64/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/sparc64/kernel/init_task.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include @@ -13,6 +14,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/sparc/kernel/init_task.c~namespaces-add-nsproxy arch/sparc/kernel/init_task.c --- a/arch/sparc/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/sparc/kernel/init_task.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include @@ -12,6 +13,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); struct task_struct init_task = INIT_TASK(init_task); EXPORT_SYMBOL(init_mm); diff -puN arch/um/kernel/init_task.c~namespaces-add-nsproxy arch/um/kernel/init_task.c --- a/arch/um/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/um/kernel/init_task.c @@ -9,6 +9,7 @@ #include "linux/sched.h" #include "linux/init_task.h" #include "linux/mqueue.h" +#include "linux/nsproxy.h" #include "asm/uaccess.h" #include "asm/pgtable.h" #include "user_util.h" @@ -17,6 +18,7 @@ static struct fs_struct init_fs = INIT_FS; struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); static struct files_struct init_files = INIT_FILES; static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); diff -puN arch/v850/kernel/init_task.c~namespaces-add-nsproxy arch/v850/kernel/init_task.c --- a/arch/v850/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/v850/kernel/init_task.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -25,6 +26,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS (init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM (init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN arch/x86_64/kernel/init_task.c~namespaces-add-nsproxy arch/x86_64/kernel/init_task.c --- a/arch/x86_64/kernel/init_task.c~namespaces-add-nsproxy +++ a/arch/x86_64/kernel/init_task.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -15,6 +16,7 @@ static struct files_struct init_files = static struct signal_struct init_signals = INIT_SIGNALS(init_signals); static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); struct mm_struct init_mm = INIT_MM(init_mm); +struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); EXPORT_SYMBOL(init_mm); diff -puN include/linux/init_task.h~namespaces-add-nsproxy include/linux/init_task.h --- a/include/linux/init_task.h~namespaces-add-nsproxy +++ a/include/linux/init_task.h @@ -66,6 +66,12 @@ .session = 1, \ } +extern struct nsproxy init_nsproxy; +#define INIT_NSPROXY(nsproxy) { \ + .count = ATOMIC_INIT(1), \ + .nslock = SPIN_LOCK_UNLOCKED, \ +} + #define INIT_SIGHAND(sighand) { \ .count = ATOMIC_INIT(1), \ .action = { { { .sa_handler = NULL, } }, }, \ @@ -115,6 +121,7 @@ extern struct group_info init_groups; .files = &init_files, \ .signal = &init_signals, \ .sighand = &init_sighand, \ + .nsproxy = &init_nsproxy, \ .pending = { \ .list = LIST_HEAD_INIT(tsk.pending.list), \ .signal = {{0}}}, \ diff -puN /dev/null include/linux/nsproxy.h --- /dev/null +++ a/include/linux/nsproxy.h @@ -0,0 +1,45 @@ +#ifndef _LINUX_NSPROXY_H +#define _LINUX_NSPROXY_H + +#include +#include + +/* + * A structure to contain pointers to all per-process + * namespaces - fs (mount), uts, network, sysvipc, etc. + * + * 'count' is the number of tasks holding a reference. + * The count for each namespace, then, will be the number + * of nsproxies pointing to it, not the number of tasks. + * + * The nsproxy is shared by tasks which share all namespaces. + * As soon as a single namespace is cloned or unshared, the + * nsproxy is copied. + */ +struct nsproxy { + atomic_t count; + spinlock_t nslock; +}; +extern struct nsproxy init_nsproxy; + +struct nsproxy *dup_namespaces(struct nsproxy *orig); +int copy_namespaces(int flags, struct task_struct *tsk); +void get_task_namespaces(struct task_struct *tsk); +void free_nsproxy(struct nsproxy *ns); + +static inline void put_nsproxy(struct nsproxy *ns) +{ + if (atomic_dec_and_test(&ns->count)) { + free_nsproxy(ns); + } +} + +static inline void exit_task_namespaces(struct task_struct *p) +{ + struct nsproxy *ns = p->nsproxy; + if (ns) { + put_nsproxy(ns); + p->nsproxy = NULL; + } +} +#endif diff -puN include/linux/sched.h~namespaces-add-nsproxy include/linux/sched.h --- a/include/linux/sched.h~namespaces-add-nsproxy +++ a/include/linux/sched.h @@ -239,6 +239,7 @@ extern signed long schedule_timeout_unin asmlinkage void schedule(void); struct namespace; +struct nsproxy; /* Maximum number of active map areas.. This is a random (large) number */ #define DEFAULT_MAX_MAP_COUNT 65536 @@ -897,6 +898,7 @@ struct task_struct { struct files_struct *files; /* namespace */ struct namespace *namespace; + struct nsproxy *nsproxy; /* signal handlers */ struct signal_struct *signal; struct sighand_struct *sighand; diff -puN kernel/exit.c~namespaces-add-nsproxy kernel/exit.c --- a/kernel/exit.c~namespaces-add-nsproxy +++ a/kernel/exit.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -409,9 +410,14 @@ void daemonize(const char *name, ...) fs = init_task.fs; current->fs = fs; atomic_inc(&fs->count); + exit_namespace(current); + exit_task_namespaces(current); current->namespace = init_task.namespace; + current->nsproxy = init_task.nsproxy; get_namespace(current->namespace); + get_task_namespaces(current); + exit_files(current); current->files = init_task.files; atomic_inc(¤t->files->count); @@ -916,6 +922,7 @@ fastcall NORET_TYPE void do_exit(long co __exit_files(tsk); __exit_fs(tsk); exit_namespace(tsk); + exit_task_namespaces(tsk); exit_thread(); cpuset_exit(tsk); exit_keys(tsk); diff -puN kernel/fork.c~namespaces-add-nsproxy kernel/fork.c --- a/kernel/fork.c~namespaces-add-nsproxy +++ a/kernel/fork.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -1083,8 +1084,10 @@ static task_t *copy_process(unsigned lon goto bad_fork_cleanup_signal; if ((retval = copy_keys(clone_flags, p))) goto bad_fork_cleanup_mm; - if ((retval = copy_namespace(clone_flags, p))) + if ((retval = copy_namespaces(clone_flags, p))) goto bad_fork_cleanup_keys; + if ((retval = copy_namespace(clone_flags, p))) + goto bad_fork_cleanup_namespaces; retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs); if (retval) goto bad_fork_cleanup_namespace; @@ -1232,6 +1235,8 @@ static task_t *copy_process(unsigned lon bad_fork_cleanup_namespace: exit_namespace(p); +bad_fork_cleanup_namespaces: + exit_task_namespaces(p); bad_fork_cleanup_keys: exit_keys(p); bad_fork_cleanup_mm: @@ -1573,6 +1578,7 @@ asmlinkage long sys_unshare(unsigned lon struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL; struct files_struct *fd, *new_fd = NULL; struct sem_undo_list *new_ulist = NULL; + struct nsproxy *new_nsproxy, *old_nsproxy; check_unshare_flags(&unshare_flags); @@ -1599,7 +1605,15 @@ asmlinkage long sys_unshare(unsigned lon if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist) { + old_nsproxy = current->nsproxy; + new_nsproxy = dup_namespaces(old_nsproxy); + if (!new_nsproxy) { + err = -ENOMEM; + goto bad_unshare_cleanup_semundo; + } + task_lock(current); + current->nsproxy = new_nsproxy; if (new_fs) { fs = current->fs; @@ -1635,8 +1649,10 @@ asmlinkage long sys_unshare(unsigned lon } task_unlock(current); + put_nsproxy(old_nsproxy); } +bad_unshare_cleanup_semundo: bad_unshare_cleanup_fd: if (new_fd) put_files_struct(new_fd); diff -puN kernel/Makefile~namespaces-add-nsproxy kernel/Makefile --- a/kernel/Makefile~namespaces-add-nsproxy +++ a/kernel/Makefile @@ -8,7 +8,7 @@ obj-y = sched.o fork.o exec_domain.o signal.o sys.o kmod.o workqueue.o pid.o \ rcupdate.o extable.o params.o posix-timers.o \ kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \ - hrtimer.o + hrtimer.o nsproxy.o obj-y += time/ obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o diff -puN /dev/null kernel/nsproxy.c --- /dev/null +++ a/kernel/nsproxy.c @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2006 IBM Corporation + * + * Author: Serge Hallyn + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + */ + +#include +#include +#include +#include + +static inline void get_nsproxy(struct nsproxy *ns) +{ + atomic_inc(&ns->count); +} + +void get_task_namespaces(struct task_struct *tsk) +{ + struct nsproxy *ns = tsk->nsproxy; + if (ns) { + get_nsproxy(ns); + } +} + +/* + * creates a copy of "orig" with refcount 1. + * This does not grab references to the contained namespaces, + * so that needs to be done by dup_namespaces. + */ +static inline struct nsproxy *clone_namespaces(struct nsproxy *orig) +{ + struct nsproxy *ns; + + ns = kmalloc(sizeof(struct nsproxy), GFP_KERNEL); + if (ns) { + memcpy(ns, orig, sizeof(struct nsproxy)); + atomic_set(&ns->count, 1); + } + return ns; +} + +/* + * copies the nsproxy, setting refcount to 1, and grabbing a + * reference to all contained namespaces. Called from + * sys_unshare() + */ +struct nsproxy *dup_namespaces(struct nsproxy *orig) +{ + struct nsproxy *ns = clone_namespaces(orig); + + return ns; +} + +/* + * called from clone. This now handles copy for nsproxy and all + * namespaces therein. + */ +int copy_namespaces(int flags, struct task_struct *tsk) +{ + struct nsproxy *old_ns = tsk->nsproxy; + + if (!old_ns) + return 0; + + get_nsproxy(old_ns); + + return 0; +} + +void free_nsproxy(struct nsproxy *ns) +{ + kfree(ns); +} _