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Merge sys_clone()/sys_unshare() nsproxy and namespace handling

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sys_clone() and sys_unshare() both makes copies of nsproxy and its associated
namespaces.  But they have different code paths.

This patch merges all the nsproxy and its associated namespace copy/clone
handling (as much as possible).  Posted on container list earlier for
feedback.

- Create a new nsproxy and its associated namespaces and pass it back to
  caller to attach it to right process.

- Changed all copy_*_ns() routines to return a new copy of namespace
  instead of attaching it to task->nsproxy.

- Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines.

- Removed unnessary !ns checks from copy_*_ns() and added BUG_ON()
  just incase.

- Get rid of all individual unshare_*_ns() routines and make use of
  copy_*_ns() instead.

[akpm@osdl.org: cleanups, warning fix]
[clg@fr.ibm.com: remove dup_namespaces() declaration]
[serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval]
[akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n]
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: <containers@lists.osdl.org>
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Badari Pulavarty
2007-05-08 00:25:21 -07:00
committed by Linus Torvalds
parent 4fc75ff481
commit e3222c4ecc
11 changed files with 131 additions and 268 deletions
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19
include/linux/utsname.h
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@@ -49,9 +49,7 @@ static inline void get_uts_ns(struct uts_namespace *ns)
}
#ifdef CONFIG_UTS_NS
extern int unshare_utsname(unsigned long unshare_flags,
struct uts_namespace **new_uts);
extern int copy_utsname(int flags, struct task_struct *tsk);
extern struct uts_namespace *copy_utsname(int flags, struct uts_namespace *ns);
extern void free_uts_ns(struct kref *kref);
static inline void put_uts_ns(struct uts_namespace *ns)
@@ -59,21 +57,12 @@ static inline void put_uts_ns(struct uts_namespace *ns)
kref_put(&ns->kref, free_uts_ns);
}
#else
static inline int unshare_utsname(unsigned long unshare_flags,
struct uts_namespace **new_uts)
static inline struct uts_namespace *copy_utsname(int flags,
struct uts_namespace *ns)
{
if (unshare_flags & CLONE_NEWUTS)
return -EINVAL;
return 0;
return ns;
}
static inline int copy_utsname(int flags, struct task_struct *tsk)
{
if (flags & CLONE_NEWUTS)
return -EINVAL;
return 0;
}
static inline void put_uts_ns(struct uts_namespace *ns)
{
}