From f84c6821aa540342360067604ad156e3d53a67ed Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Tue, 13 Feb 2018 12:29:52 +0300 Subject: [PATCH] net: Convert pernet_subsys, registered from inet_init() arp_net_ops just addr/removes /proc entry. devinet_ops allocates and frees duplicate of init_net tables and (un)registers sysctl entries. fib_net_ops allocates and frees pernet tables, creates/destroys netlink socket and (un)initializes /proc entries. Foreign pernet_operations do not touch them. ip_rt_proc_ops only modifies pernet /proc entries. xfrm_net_ops creates/destroys /proc entries, allocates/frees pernet statistics, hashes and tables, and (un)initializes sysctl files. These are not touched by foreigh pernet_operations xfrm4_net_ops allocates/frees private pernet memory, and configures sysctls. sysctl_route_ops creates/destroys sysctls. rt_genid_ops only initializes fields of just allocated net. ipv4_inetpeer_ops allocated/frees net private memory. igmp_net_ops just creates/destroys /proc files and socket, noone else interested in. tcp_sk_ops seems to be safe, because tcp_sk_init() does not depend on any other pernet_operations modifications. Iteration over hash table in inet_twsk_purge() is made under RCU lock, and it's safe to iterate the table this way. Removing from the table happen from inet_twsk_deschedule_put(), but this function is safe without any extern locks, as it's synchronized inside itself. There are many examples, it's used in different context. So, it's safe to leave tcp_sk_exit_batch() unlocked. tcp_net_metrics_ops is synchronized on tcp_metrics_lock and safe. udplite4_net_ops only creates/destroys pernet /proc file. icmp_sk_ops creates percpu sockets, not touched by foreign pernet_operations. ipmr_net_ops creates/destroys pernet fib tables, (un)registers fib rules and /proc files. This seem to be safe to execute in parallel with foreign pernet_operations. af_inet_ops just sets up default parameters of newly created net. ipv4_mib_ops creates and destroys pernet percpu statistics. raw_net_ops, tcp4_net_ops, udp4_net_ops, ping_v4_net_ops and ip_proc_ops only create/destroy pernet /proc files. ip4_frags_ops creates and destroys sysctl file. So, it's safe to make the pernet_operations async. Signed-off-by: Kirill Tkhai Acked-by: Andrei Vagin Signed-off-by: David S. Miller --- net/ipv4/af_inet.c | 2 ++ net/ipv4/arp.c | 1 + net/ipv4/devinet.c | 1 + net/ipv4/fib_frontend.c | 1 + net/ipv4/icmp.c | 1 + net/ipv4/igmp.c | 1 + net/ipv4/ip_fragment.c | 1 + net/ipv4/ipmr.c | 1 + net/ipv4/ping.c | 1 + net/ipv4/proc.c | 1 + net/ipv4/raw.c | 1 + net/ipv4/route.c | 4 ++++ net/ipv4/tcp_ipv4.c | 2 ++ net/ipv4/tcp_metrics.c | 1 + net/ipv4/udp.c | 1 + net/ipv4/udplite.c | 1 + net/ipv4/xfrm4_policy.c | 1 + net/xfrm/xfrm_policy.c | 1 + 18 files changed, 23 insertions(+) diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index f98e2f0d..e8c7fad 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1735,6 +1735,7 @@ static __net_exit void ipv4_mib_exit_net(struct net *net) static __net_initdata struct pernet_operations ipv4_mib_ops = { .init = ipv4_mib_init_net, .exit = ipv4_mib_exit_net, + .async = true, }; static int __init init_ipv4_mibs(void) @@ -1788,6 +1789,7 @@ static __net_exit void inet_exit_net(struct net *net) static __net_initdata struct pernet_operations af_inet_ops = { .init = inet_init_net, .exit = inet_exit_net, + .async = true, }; static int __init init_inet_pernet_ops(void) diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index f28f06c..7dc9de8 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -1447,6 +1447,7 @@ static void __net_exit arp_net_exit(struct net *net) static struct pernet_operations arp_net_ops = { .init = arp_net_init, .exit = arp_net_exit, + .async = true, }; static int __init arp_proc_init(void) diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 40f0017..5ae0d1f 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -2469,6 +2469,7 @@ static __net_exit void devinet_exit_net(struct net *net) static __net_initdata struct pernet_operations devinet_ops = { .init = devinet_init_net, .exit = devinet_exit_net, + .async = true, }; static struct rtnl_af_ops inet_af_ops __read_mostly = { diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index f05afaf..ac71c3d 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -1362,6 +1362,7 @@ static void __net_exit fib_net_exit(struct net *net) static struct pernet_operations fib_net_ops = { .init = fib_net_init, .exit = fib_net_exit, + .async = true, }; void __init ip_fib_init(void) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 1617604..cc56efa 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -1257,6 +1257,7 @@ fail: static struct pernet_operations __net_initdata icmp_sk_ops = { .init = icmp_sk_init, .exit = icmp_sk_exit, + .async = true, }; int __init icmp_init(void) diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index f240258..c274376 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -3028,6 +3028,7 @@ static void __net_exit igmp_net_exit(struct net *net) static struct pernet_operations igmp_net_ops = { .init = igmp_net_init, .exit = igmp_net_exit, + .async = true, }; #endif diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index bbf1b94..5e843ae 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -885,6 +885,7 @@ static void __net_exit ipv4_frags_exit_net(struct net *net) static struct pernet_operations ip4_frags_ops = { .init = ipv4_frags_init_net, .exit = ipv4_frags_exit_net, + .async = true, }; void __init ipfrag_init(void) diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index b05689b..7c7ac9d 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -3327,6 +3327,7 @@ static void __net_exit ipmr_net_exit(struct net *net) static struct pernet_operations ipmr_net_ops = { .init = ipmr_net_init, .exit = ipmr_net_exit, + .async = true, }; int __init ip_mr_init(void) diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index b8f0db5..0164def9 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -1204,6 +1204,7 @@ static void __net_exit ping_v4_proc_exit_net(struct net *net) static struct pernet_operations ping_v4_net_ops = { .init = ping_v4_proc_init_net, .exit = ping_v4_proc_exit_net, + .async = true, }; int __init ping_proc_init(void) diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index dc5edc8..fdabc70 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -549,6 +549,7 @@ static __net_exit void ip_proc_exit_net(struct net *net) static __net_initdata struct pernet_operations ip_proc_ops = { .init = ip_proc_init_net, .exit = ip_proc_exit_net, + .async = true, }; int __init ip_misc_proc_init(void) diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 9b367fc..54648d2 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -1156,6 +1156,7 @@ static __net_exit void raw_exit_net(struct net *net) static __net_initdata struct pernet_operations raw_net_ops = { .init = raw_init_net, .exit = raw_exit_net, + .async = true, }; int __init raw_proc_init(void) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 49cc1c1..9376ed6 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -417,6 +417,7 @@ static void __net_exit ip_rt_do_proc_exit(struct net *net) static struct pernet_operations ip_rt_proc_ops __net_initdata = { .init = ip_rt_do_proc_init, .exit = ip_rt_do_proc_exit, + .async = true, }; static int __init ip_rt_proc_init(void) @@ -2994,6 +2995,7 @@ static __net_exit void sysctl_route_net_exit(struct net *net) static __net_initdata struct pernet_operations sysctl_route_ops = { .init = sysctl_route_net_init, .exit = sysctl_route_net_exit, + .async = true, }; #endif @@ -3007,6 +3009,7 @@ static __net_init int rt_genid_init(struct net *net) static __net_initdata struct pernet_operations rt_genid_ops = { .init = rt_genid_init, + .async = true, }; static int __net_init ipv4_inetpeer_init(struct net *net) @@ -3032,6 +3035,7 @@ static void __net_exit ipv4_inetpeer_exit(struct net *net) static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { .init = ipv4_inetpeer_init, .exit = ipv4_inetpeer_exit, + .async = true, }; #ifdef CONFIG_IP_ROUTE_CLASSID diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index f8ad397..ac16795 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2387,6 +2387,7 @@ static void __net_exit tcp4_proc_exit_net(struct net *net) static struct pernet_operations tcp4_net_ops = { .init = tcp4_proc_init_net, .exit = tcp4_proc_exit_net, + .async = true, }; int __init tcp4_proc_init(void) @@ -2573,6 +2574,7 @@ static struct pernet_operations __net_initdata tcp_sk_ops = { .init = tcp_sk_init, .exit = tcp_sk_exit, .exit_batch = tcp_sk_exit_batch, + .async = true, }; void __init tcp_v4_init(void) diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 03b51cd..aa6fea9 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -1024,6 +1024,7 @@ static void __net_exit tcp_net_metrics_exit_batch(struct list_head *net_exit_lis static __net_initdata struct pernet_operations tcp_net_metrics_ops = { .init = tcp_net_metrics_init, .exit_batch = tcp_net_metrics_exit_batch, + .async = true, }; void __init tcp_metrics_init(void) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index bfaefe5..ac5fac0 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2757,6 +2757,7 @@ static void __net_exit udp4_proc_exit_net(struct net *net) static struct pernet_operations udp4_net_ops = { .init = udp4_proc_init_net, .exit = udp4_proc_exit_net, + .async = true, }; int __init udp4_proc_init(void) diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c index f96614e..72f2c38 100644 --- a/net/ipv4/udplite.c +++ b/net/ipv4/udplite.c @@ -104,6 +104,7 @@ static void __net_exit udplite4_proc_exit_net(struct net *net) static struct pernet_operations udplite4_net_ops = { .init = udplite4_proc_init_net, .exit = udplite4_proc_exit_net, + .async = true, }; static __init int udplite4_proc_init(void) diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c index 05017e2..753f526 100644 --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -365,6 +365,7 @@ static void __net_exit xfrm4_net_exit(struct net *net) static struct pernet_operations __net_initdata xfrm4_net_ops = { .init = xfrm4_net_init, .exit = xfrm4_net_exit, + .async = true, }; static void __init xfrm4_policy_init(void) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 7a23078..77d9d1a 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2982,6 +2982,7 @@ static void __net_exit xfrm_net_exit(struct net *net) static struct pernet_operations __net_initdata xfrm_net_ops = { .init = xfrm_net_init, .exit = xfrm_net_exit, + .async = true, }; void __init xfrm_init(void) -- 2.7.4