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[PATCH] namespaces: utsname: implement utsname namespaces
This patch defines the uts namespace and some manipulators. Adds the uts namespace to task_struct, and initializes a system-wide init namespace. It leaves a #define for system_utsname so sysctl will compile. This define will be removed in a separate patch. [[email protected]: build fix, cleanup] Signed-off-by: Serge Hallyn <[email protected]> Cc: Kirill Korotaev <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: Herbert Poetzl <[email protected]> Cc: Andrey Savochkin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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9 changed files with 121 additions and 12 deletions
42
kernel/utsname.c
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42
kernel/utsname.c
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/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Author: Serge Hallyn <serue@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/module.h>
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#include <linux/uts.h>
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#include <linux/utsname.h>
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#include <linux/version.h>
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/*
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* Copy task tsk's utsname namespace, or clone it if flags
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* specifies CLONE_NEWUTS. In latter case, changes to the
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* utsname of this process won't be seen by parent, and vice
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* versa.
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*/
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int copy_utsname(int flags, struct task_struct *tsk)
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{
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struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
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int err = 0;
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if (!old_ns)
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return 0;
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get_uts_ns(old_ns);
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return err;
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}
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void free_uts_ns(struct kref *kref)
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{
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struct uts_namespace *ns;
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ns = container_of(kref, struct uts_namespace, kref);
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kfree(ns);
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}
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