add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/net/core/fib_notifier.c
..
..
@@ -5,17 +5,22 @@
5
5
 #include <linux/module.h>
6
6
 #include <linux/init.h>
7
7
 #include <net/net_namespace.h>
8
+#include <net/netns/generic.h>
8
9
 #include <net/fib_notifier.h>
9
10
 
10
-static ATOMIC_NOTIFIER_HEAD(fib_chain);
11
+static unsigned int fib_notifier_net_id;
11
12
 
12
-int call_fib_notifier(struct notifier_block *nb, struct net *net,
13
+struct fib_notifier_net {
14
+	struct list_head fib_notifier_ops;
15
+	struct atomic_notifier_head fib_chain;
16
+};
17
+
18
+int call_fib_notifier(struct notifier_block *nb,
13
19
 		      enum fib_event_type event_type,
14
20
 		      struct fib_notifier_info *info)
15
21
 {
16
22
 	int err;
17
23
 
18
-	info->net = net;
19
24
 	err = nb->notifier_call(nb, event_type, info);
20
25
 	return notifier_to_errno(err);
21
26
 }
..
..
@@ -24,115 +29,113 @@
24
29
 int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
25
30
 		       struct fib_notifier_info *info)
26
31
 {
32
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
27
33
 	int err;
28
34
 
29
-	info->net = net;
30
-	err = atomic_notifier_call_chain(&fib_chain, event_type, info);
35
+	err = atomic_notifier_call_chain(&fn_net->fib_chain, event_type, info);
31
36
 	return notifier_to_errno(err);
32
37
 }
33
38
 EXPORT_SYMBOL(call_fib_notifiers);
34
39
 
35
-static unsigned int fib_seq_sum(void)
40
+static unsigned int fib_seq_sum(struct net *net)
36
41
 {
42
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
37
43
 	struct fib_notifier_ops *ops;
38
44
 	unsigned int fib_seq = 0;
39
-	struct net *net;
40
45
 
41
46
 	rtnl_lock();
42
-	down_read(&net_rwsem);
43
-	for_each_net(net) {
44
-		rcu_read_lock();
45
-		list_for_each_entry_rcu(ops, &net->fib_notifier_ops, list) {
46
-			if (!try_module_get(ops->owner))
47
-				continue;
48
-			fib_seq += ops->fib_seq_read(net);
49
-			module_put(ops->owner);
50
-		}
51
-		rcu_read_unlock();
47
+	rcu_read_lock();
48
+	list_for_each_entry_rcu(ops, &fn_net->fib_notifier_ops, list) {
49
+		if (!try_module_get(ops->owner))
50
+			continue;
51
+		fib_seq += ops->fib_seq_read(net);
52
+		module_put(ops->owner);
52
53
 	}
53
-	up_read(&net_rwsem);
54
+	rcu_read_unlock();
54
55
 	rtnl_unlock();
55
56
 
56
57
 	return fib_seq;
57
58
 }
58
59
 
59
-static int fib_net_dump(struct net *net, struct notifier_block *nb)
60
+static int fib_net_dump(struct net *net, struct notifier_block *nb,
61
+			struct netlink_ext_ack *extack)
60
62
 {
63
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
61
64
 	struct fib_notifier_ops *ops;
65
+	int err = 0;
62
66
 
63
-	list_for_each_entry_rcu(ops, &net->fib_notifier_ops, list) {
64
-		int err;
65
-
67
+	rcu_read_lock();
68
+	list_for_each_entry_rcu(ops, &fn_net->fib_notifier_ops, list) {
66
69
 		if (!try_module_get(ops->owner))
67
70
 			continue;
68
-		err = ops->fib_dump(net, nb);
71
+		err = ops->fib_dump(net, nb, extack);
69
72
 		module_put(ops->owner);
70
73
 		if (err)
71
-			return err;
74
+			goto unlock;
72
75
 	}
73
76
 
74
-	return 0;
77
+unlock:
78
+	rcu_read_unlock();
79
+
80
+	return err;
75
81
 }
76
82
 
77
-static bool fib_dump_is_consistent(struct notifier_block *nb,
83
+static bool fib_dump_is_consistent(struct net *net, struct notifier_block *nb,
78
84
 				   void (*cb)(struct notifier_block *nb),
79
85
 				   unsigned int fib_seq)
80
86
 {
81
-	atomic_notifier_chain_register(&fib_chain, nb);
82
-	if (fib_seq == fib_seq_sum())
87
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
88
+
89
+	atomic_notifier_chain_register(&fn_net->fib_chain, nb);
90
+	if (fib_seq == fib_seq_sum(net))
83
91
 		return true;
84
-	atomic_notifier_chain_unregister(&fib_chain, nb);
92
+	atomic_notifier_chain_unregister(&fn_net->fib_chain, nb);
85
93
 	if (cb)
86
94
 		cb(nb);
87
95
 	return false;
88
96
 }
89
97
 
90
98
 #define FIB_DUMP_MAX_RETRIES 5
91
-int register_fib_notifier(struct notifier_block *nb,
92
-			  void (*cb)(struct notifier_block *nb))
99
+int register_fib_notifier(struct net *net, struct notifier_block *nb,
100
+			  void (*cb)(struct notifier_block *nb),
101
+			  struct netlink_ext_ack *extack)
93
102
 {
94
103
 	int retries = 0;
95
104
 	int err;
96
105
 
97
106
 	do {
98
-		unsigned int fib_seq = fib_seq_sum();
99
-		struct net *net;
107
+		unsigned int fib_seq = fib_seq_sum(net);
100
108
 
101
-		rcu_read_lock();
102
-		for_each_net_rcu(net) {
103
-			err = fib_net_dump(net, nb);
104
-			if (err)
105
-				goto err_fib_net_dump;
106
-		}
107
-		rcu_read_unlock();
109
+		err = fib_net_dump(net, nb, extack);
110
+		if (err)
111
+			return err;
108
112
 
109
-		if (fib_dump_is_consistent(nb, cb, fib_seq))
113
+		if (fib_dump_is_consistent(net, nb, cb, fib_seq))
110
114
 			return 0;
111
115
 	} while (++retries < FIB_DUMP_MAX_RETRIES);
112
116
 
113
117
 	return -EBUSY;
114
-
115
-err_fib_net_dump:
116
-	rcu_read_unlock();
117
-	return err;
118
118
 }
119
119
 EXPORT_SYMBOL(register_fib_notifier);
120
120
 
121
-int unregister_fib_notifier(struct notifier_block *nb)
121
+int unregister_fib_notifier(struct net *net, struct notifier_block *nb)
122
122
 {
123
-	return atomic_notifier_chain_unregister(&fib_chain, nb);
123
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
124
+
125
+	return atomic_notifier_chain_unregister(&fn_net->fib_chain, nb);
124
126
 }
125
127
 EXPORT_SYMBOL(unregister_fib_notifier);
126
128
 
127
129
 static int __fib_notifier_ops_register(struct fib_notifier_ops *ops,
128
130
 				       struct net *net)
129
131
 {
132
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
130
133
 	struct fib_notifier_ops *o;
131
134
 
132
-	list_for_each_entry(o, &net->fib_notifier_ops, list)
135
+	list_for_each_entry(o, &fn_net->fib_notifier_ops, list)
133
136
 		if (ops->family == o->family)
134
137
 			return -EEXIST;
135
-	list_add_tail_rcu(&ops->list, &net->fib_notifier_ops);
138
+	list_add_tail_rcu(&ops->list, &fn_net->fib_notifier_ops);
136
139
 	return 0;
137
140
 }
138
141
 
..
..
@@ -167,18 +170,25 @@
167
170
 
168
171
 static int __net_init fib_notifier_net_init(struct net *net)
169
172
 {
170
-	INIT_LIST_HEAD(&net->fib_notifier_ops);
173
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
174
+
175
+	INIT_LIST_HEAD(&fn_net->fib_notifier_ops);
176
+	ATOMIC_INIT_NOTIFIER_HEAD(&fn_net->fib_chain);
171
177
 	return 0;
172
178
 }
173
179
 
174
180
 static void __net_exit fib_notifier_net_exit(struct net *net)
175
181
 {
176
-	WARN_ON_ONCE(!list_empty(&net->fib_notifier_ops));
182
+	struct fib_notifier_net *fn_net = net_generic(net, fib_notifier_net_id);
183
+
184
+	WARN_ON_ONCE(!list_empty(&fn_net->fib_notifier_ops));
177
185
 }
178
186
 
179
187
 static struct pernet_operations fib_notifier_net_ops = {
180
188
 	.init = fib_notifier_net_init,
181
189
 	.exit = fib_notifier_net_exit,
190
+	.id = &fib_notifier_net_id,
191
+	.size = sizeof(struct fib_notifier_net),
182
192
 };
183
193
 
184
194
 static int __init fib_notifier_init(void)