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Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/ns_common.h49
1 files changed, 13 insertions, 36 deletions
diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
index bd4492ef6ffc..66ea09b48377 100644
--- a/include/linux/ns_common.h
+++ b/include/linux/ns_common.h
@@ -141,6 +141,12 @@ static __always_inline bool is_initial_namespace(struct ns_common *ns)
IPC_NS_INIT_INO - MNT_NS_INIT_INO + 1));
}
+static __always_inline bool is_ns_init_id(const struct ns_common *ns)
+{
+ VFS_WARN_ON_ONCE(ns->ns_id == 0);
+ return ns->ns_id <= NS_LAST_INIT_ID;
+}
+
#define to_ns_common(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: &(__ns)->ns, \
@@ -281,54 +287,25 @@ static __always_inline __must_check int __ns_ref_read(const struct ns_common *ns
#define ns_ref_active_read(__ns) \
((__ns) ? __ns_ref_active_read(to_ns_common(__ns)) : 0)
-void __ns_ref_active_get_owner(struct ns_common *ns);
-
-static __always_inline void __ns_ref_active_get(struct ns_common *ns)
-{
- WARN_ON_ONCE(atomic_add_negative(1, &ns->__ns_ref_active));
- VFS_WARN_ON_ONCE(is_initial_namespace(ns) && __ns_ref_active_read(ns) <= 0);
-}
-#define ns_ref_active_get(__ns) \
- do { if (__ns) __ns_ref_active_get(to_ns_common(__ns)); } while (0)
-
-static __always_inline bool __ns_ref_active_get_not_zero(struct ns_common *ns)
-{
- if (atomic_inc_not_zero(&ns->__ns_ref_active)) {
- VFS_WARN_ON_ONCE(!__ns_ref_read(ns));
- return true;
- }
- return false;
-}
-
-#define ns_ref_active_get_owner(__ns) \
- do { if (__ns) __ns_ref_active_get_owner(to_ns_common(__ns)); } while (0)
-
-void __ns_ref_active_put_owner(struct ns_common *ns);
+void __ns_ref_active_put(struct ns_common *ns);
-static __always_inline void __ns_ref_active_put(struct ns_common *ns)
-{
- if (atomic_dec_and_test(&ns->__ns_ref_active)) {
- VFS_WARN_ON_ONCE(is_initial_namespace(ns));
- VFS_WARN_ON_ONCE(!__ns_ref_read(ns));
- __ns_ref_active_put_owner(ns);
- }
-}
#define ns_ref_active_put(__ns) \
do { if (__ns) __ns_ref_active_put(to_ns_common(__ns)); } while (0)
static __always_inline struct ns_common *__must_check ns_get_unless_inactive(struct ns_common *ns)
{
- VFS_WARN_ON_ONCE(__ns_ref_active_read(ns) && !__ns_ref_read(ns));
- if (!__ns_ref_active_read(ns))
+ if (!__ns_ref_active_read(ns)) {
+ VFS_WARN_ON_ONCE(is_ns_init_id(ns));
return NULL;
+ }
if (!__ns_ref_get(ns))
return NULL;
return ns;
}
-void __ns_ref_active_resurrect(struct ns_common *ns);
+void __ns_ref_active_get(struct ns_common *ns);
-#define ns_ref_active_resurrect(__ns) \
- do { if (__ns) __ns_ref_active_resurrect(to_ns_common(__ns)); } while (0)
+#define ns_ref_active_get(__ns) \
+ do { if (__ns) __ns_ref_active_get(to_ns_common(__ns)); } while (0)
#endif