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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 16:35:18 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 16:35:18 -0500
commit444f378b237a0f728f5c4aba752c08d13c209344 (patch)
tree248fd00bb2e60cb0890fce38b6a66fed65f977e4 /include/linux
parent8c8c4bafc3a20a6fb9078315ff865bc42276f9ba (diff)
Revert "[PATCH] namespaces: fix exit race by splitting exit"
This reverts commit 7a238fcba0629b6f2edbcd37458bae56fcf36be5 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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/nsproxy.h30
1 files changed, 11 insertions, 19 deletions
diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index 678e1d38effb..0b9f0dc30d61 100644
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -35,30 +35,22 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig);
35int copy_namespaces(int flags, struct task_struct *tsk); 35int copy_namespaces(int flags, struct task_struct *tsk);
36void get_task_namespaces(struct task_struct *tsk); 36void get_task_namespaces(struct task_struct *tsk);
37void free_nsproxy(struct nsproxy *ns); 37void free_nsproxy(struct nsproxy *ns);
38struct nsproxy *put_nsproxy(struct nsproxy *ns);
39 38
40static inline void finalize_put_nsproxy(struct nsproxy *ns) 39static inline void put_nsproxy(struct nsproxy *ns)
41{ 40{
42 if (ns) 41 if (atomic_dec_and_test(&ns->count)) {
43 free_nsproxy(ns); 42 free_nsproxy(ns);
43 }
44} 44}
45 45
46static inline void put_and_finalize_nsproxy(struct nsproxy *ns) 46static inline void exit_task_namespaces(struct task_struct *p)
47{ 47{
48 finalize_put_nsproxy(put_nsproxy(ns)); 48 struct nsproxy *ns = p->nsproxy;
49} 49 if (ns) {
50 50 task_lock(p);
51static inline struct nsproxy *preexit_task_namespaces(struct task_struct *p) 51 p->nsproxy = NULL;
52{ 52 task_unlock(p);
53 return put_nsproxy(p->nsproxy); 53 put_nsproxy(ns);
54} 54 }
55
56static inline void exit_task_namespaces(struct task_struct *p,
57 struct nsproxy *ns)
58{
59 task_lock(p);
60 p->nsproxy = NULL;
61 task_unlock(p);
62 finalize_put_nsproxy(ns);
63} 55}
64#endif 56#endif