Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ns: add reference count helpers
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
+35
-10
+35
-10
include/linux/ns_common.h
+35
-10
include/linux/ns_common.h
···
43
43
int __ns_common_init(struct ns_common *ns, const struct proc_ns_operations *ops, int inum);
44
44
void __ns_common_free(struct ns_common *ns);
45
45
46
-
#define to_ns_common(__ns) \
47
-
_Generic((__ns), \
48
-
struct cgroup_namespace *: &(__ns)->ns, \
49
-
struct ipc_namespace *: &(__ns)->ns, \
50
-
struct mnt_namespace *: &(__ns)->ns, \
51
-
struct net *: &(__ns)->ns, \
52
-
struct pid_namespace *: &(__ns)->ns, \
53
-
struct time_namespace *: &(__ns)->ns, \
54
-
struct user_namespace *: &(__ns)->ns, \
55
-
struct uts_namespace *: &(__ns)->ns)
46
+
#define to_ns_common(__ns) \
47
+
_Generic((__ns), \
48
+
struct cgroup_namespace *: &(__ns)->ns, \
49
+
const struct cgroup_namespace *: &(__ns)->ns, \
50
+
struct ipc_namespace *: &(__ns)->ns, \
51
+
const struct ipc_namespace *: &(__ns)->ns, \
52
+
struct mnt_namespace *: &(__ns)->ns, \
53
+
const struct mnt_namespace *: &(__ns)->ns, \
54
+
struct net *: &(__ns)->ns, \
55
+
const struct net *: &(__ns)->ns, \
56
+
struct pid_namespace *: &(__ns)->ns, \
57
+
const struct pid_namespace *: &(__ns)->ns, \
58
+
struct time_namespace *: &(__ns)->ns, \
59
+
const struct time_namespace *: &(__ns)->ns, \
60
+
struct user_namespace *: &(__ns)->ns, \
61
+
const struct user_namespace *: &(__ns)->ns, \
62
+
struct uts_namespace *: &(__ns)->ns, \
63
+
const struct uts_namespace *: &(__ns)->ns)
56
64
57
65
#define ns_init_inum(__ns) \
58
66
_Generic((__ns), \
···
90
82
#define ns_common_init_inum(__ns, __ops, __inum) __ns_common_init(to_ns_common(__ns), __ops, __inum)
91
83
92
84
#define ns_common_free(__ns) __ns_common_free(to_ns_common((__ns)))
85
+
86
+
static __always_inline __must_check bool __ns_ref_put(struct ns_common *ns)
87
+
{
88
+
return refcount_dec_and_test(&ns->count);
89
+
}
90
+
91
+
static __always_inline __must_check bool __ns_ref_get(struct ns_common *ns)
92
+
{
93
+
return refcount_inc_not_zero(&ns->count);
94
+
}
95
+
96
+
#define ns_ref_read(__ns) refcount_read(&to_ns_common((__ns))->count)
97
+
#define ns_ref_inc(__ns) refcount_inc(&to_ns_common((__ns))->count)
98
+
#define ns_ref_get(__ns) __ns_ref_get(to_ns_common((__ns)))
99
+
#define ns_ref_put(__ns) __ns_ref_put(to_ns_common((__ns)))
100
+
#define ns_ref_put_and_lock(__ns, __lock) \
101
+
refcount_dec_and_lock(&to_ns_common((__ns))->count, (__lock))
93
102
94
103
#endif