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Revert "[PATCH] namespaces: fix exit race by splitting exit"

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This reverts commit 7a238fcba0 in
preparation for a better and simpler fix proposed by Eric Biederman
(and fixed up by Serge Hallyn)

Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds
2007-01-30 13:35:18 -08:00
parent 8c8c4bafc3
commit 444f378b23
4 changed files with 16 additions and 40 deletions
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30
include/linux/nsproxy.h
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@@ -35,30 +35,22 @@ 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);
struct nsproxy *put_nsproxy(struct nsproxy *ns);
static inline void finalize_put_nsproxy(struct nsproxy *ns)
static inline void put_nsproxy(struct nsproxy *ns)
{
if (ns)
if (atomic_dec_and_test(&ns->count)) {
free_nsproxy(ns);
}
}
static inline void put_and_finalize_nsproxy(struct nsproxy *ns)
static inline void exit_task_namespaces(struct task_struct *p)
{
finalize_put_nsproxy(put_nsproxy(ns));
}
static inline struct nsproxy *preexit_task_namespaces(struct task_struct *p)
{
return put_nsproxy(p->nsproxy);
}
static inline void exit_task_namespaces(struct task_struct *p,
struct nsproxy *ns)
{
task_lock(p);
p->nsproxy = NULL;
task_unlock(p);
finalize_put_nsproxy(ns);
struct nsproxy *ns = p->nsproxy;
if (ns) {
task_lock(p);
p->nsproxy = NULL;
task_unlock(p);
put_nsproxy(ns);
}
}
#endif