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Date: Wed, 20 Apr 2011 02:46:17 -0700
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Hans Schillstrom <hans@...illstrom.com>
Cc: horms@...ge.net.au, ja@....bg, lvs-devel@...r.kernel.org,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
hans.schillstrom@...csson.com
Subject: Re: [PATCH 2/3] IPVS: Change of register_pernet_subsys to register_pernet_device
Hans Schillstrom <hans@...illstrom.com> writes:
> This is part 1 of a makeover of the init and cleanup
> functions in ip_vs using name space.
That this fixes problems for you is great. Why does this
fix the problems. Does ip_vs really act more as a
network device passing packets than as a protocol implementation
or a library?
register_pernet_subsys already gives you the guarantee that
cleanup is in the reverse order of initialization.
I expect you are on the right track but it isn't clear to me from
reading the patch and it's description why this code should work.
Eric
> Signed-off-by: Hans Schillstrom <hans@...illstrom.com>
> ---
> net/netfilter/ipvs/ip_vs_app.c | 4 ++--
> net/netfilter/ipvs/ip_vs_conn.c | 4 ++--
> net/netfilter/ipvs/ip_vs_core.c | 6 +++---
> net/netfilter/ipvs/ip_vs_ctl.c | 6 +++---
> net/netfilter/ipvs/ip_vs_est.c | 4 ++--
> net/netfilter/ipvs/ip_vs_ftp.c | 4 ++--
> net/netfilter/ipvs/ip_vs_lblc.c | 6 +++---
> net/netfilter/ipvs/ip_vs_lblcr.c | 6 +++---
> net/netfilter/ipvs/ip_vs_proto.c | 4 ++--
> net/netfilter/ipvs/ip_vs_sync.c | 4 ++--
> 10 files changed, 24 insertions(+), 24 deletions(-)
>
> diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
> index 2dc6de1..7e8e769 100644
> --- a/net/netfilter/ipvs/ip_vs_app.c
> +++ b/net/netfilter/ipvs/ip_vs_app.c
> @@ -599,12 +599,12 @@ int __init ip_vs_app_init(void)
> {
> int rv;
>
> - rv = register_pernet_subsys(&ip_vs_app_ops);
> + rv = register_pernet_device(&ip_vs_app_ops);
> return rv;
> }
>
>
> void ip_vs_app_cleanup(void)
> {
> - unregister_pernet_subsys(&ip_vs_app_ops);
> + unregister_pernet_device(&ip_vs_app_ops);
> }
> diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
> index c97bd45..36cd5ea 100644
> --- a/net/netfilter/ipvs/ip_vs_conn.c
> +++ b/net/netfilter/ipvs/ip_vs_conn.c
> @@ -1309,7 +1309,7 @@ int __init ip_vs_conn_init(void)
> rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
> }
>
> - retc = register_pernet_subsys(&ipvs_conn_ops);
> + retc = register_pernet_device(&ipvs_conn_ops);
>
> /* calculate the random value for connection hash */
> get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
> @@ -1319,7 +1319,7 @@ int __init ip_vs_conn_init(void)
>
> void ip_vs_conn_cleanup(void)
> {
> - unregister_pernet_subsys(&ipvs_conn_ops);
> + unregister_pernet_device(&ipvs_conn_ops);
> /* Release the empty cache */
> kmem_cache_destroy(ip_vs_conn_cachep);
> vfree(ip_vs_conn_tab);
> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> index 07accf6..a7bb81d 100644
> --- a/net/netfilter/ipvs/ip_vs_core.c
> +++ b/net/netfilter/ipvs/ip_vs_core.c
> @@ -1913,7 +1913,7 @@ static int __init ip_vs_init(void)
> {
> int ret;
>
> - ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */
> + ret = register_pernet_device(&ipvs_core_ops); /* Alloc ip_vs struct */
> if (ret < 0)
> return ret;
>
> @@ -1964,7 +1964,7 @@ cleanup_sync:
> ip_vs_control_cleanup();
> cleanup_estimator:
> ip_vs_estimator_cleanup();
> - unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */
> + unregister_pernet_device(&ipvs_core_ops); /* free ip_vs struct */
> return ret;
> }
>
> @@ -1977,7 +1977,7 @@ static void __exit ip_vs_cleanup(void)
> ip_vs_protocol_cleanup();
> ip_vs_control_cleanup();
> ip_vs_estimator_cleanup();
> - unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */
> + unregister_pernet_device(&ipvs_core_ops); /* free ip_vs struct */
> pr_info("ipvs unloaded.\n");
> }
>
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index ae47090..08715d8 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -3657,7 +3657,7 @@ int __init ip_vs_control_init(void)
> INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
> }
>
> - ret = register_pernet_subsys(&ipvs_control_ops);
> + ret = register_pernet_device(&ipvs_control_ops);
> if (ret) {
> pr_err("cannot register namespace.\n");
> goto err;
> @@ -3682,7 +3682,7 @@ int __init ip_vs_control_init(void)
> return 0;
>
> err_net:
> - unregister_pernet_subsys(&ipvs_control_ops);
> + unregister_pernet_device(&ipvs_control_ops);
> err:
> return ret;
> }
> @@ -3691,7 +3691,7 @@ err:
> void ip_vs_control_cleanup(void)
> {
> EnterFunction(2);
> - unregister_pernet_subsys(&ipvs_control_ops);
> + unregister_pernet_device(&ipvs_control_ops);
> ip_vs_genl_unregister();
> nf_unregister_sockopt(&ip_vs_sockopts);
> LeaveFunction(2);
> diff --git a/net/netfilter/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c
> index 8c8766c..759163e 100644
> --- a/net/netfilter/ipvs/ip_vs_est.c
> +++ b/net/netfilter/ipvs/ip_vs_est.c
> @@ -216,11 +216,11 @@ int __init ip_vs_estimator_init(void)
> {
> int rv;
>
> - rv = register_pernet_subsys(&ip_vs_app_ops);
> + rv = register_pernet_device(&ip_vs_app_ops);
> return rv;
> }
>
> void ip_vs_estimator_cleanup(void)
> {
> - unregister_pernet_subsys(&ip_vs_app_ops);
> + unregister_pernet_device(&ip_vs_app_ops);
> }
> diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
> index 6b5dd6d..dfa04d3 100644
> --- a/net/netfilter/ipvs/ip_vs_ftp.c
> +++ b/net/netfilter/ipvs/ip_vs_ftp.c
> @@ -451,7 +451,7 @@ int __init ip_vs_ftp_init(void)
> {
> int rv;
>
> - rv = register_pernet_subsys(&ip_vs_ftp_ops);
> + rv = register_pernet_device(&ip_vs_ftp_ops);
> return rv;
> }
>
> @@ -460,7 +460,7 @@ int __init ip_vs_ftp_init(void)
> */
> static void __exit ip_vs_ftp_exit(void)
> {
> - unregister_pernet_subsys(&ip_vs_ftp_ops);
> + unregister_pernet_device(&ip_vs_ftp_ops);
> }
>
>
> diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
> index 87e40ea..96765d0 100644
> --- a/net/netfilter/ipvs/ip_vs_lblc.c
> +++ b/net/netfilter/ipvs/ip_vs_lblc.c
> @@ -603,20 +603,20 @@ static int __init ip_vs_lblc_init(void)
> {
> int ret;
>
> - ret = register_pernet_subsys(&ip_vs_lblc_ops);
> + ret = register_pernet_device(&ip_vs_lblc_ops);
> if (ret)
> return ret;
>
> ret = register_ip_vs_scheduler(&ip_vs_lblc_scheduler);
> if (ret)
> - unregister_pernet_subsys(&ip_vs_lblc_ops);
> + unregister_pernet_device(&ip_vs_lblc_ops);
> return ret;
> }
>
> static void __exit ip_vs_lblc_cleanup(void)
> {
> unregister_ip_vs_scheduler(&ip_vs_lblc_scheduler);
> - unregister_pernet_subsys(&ip_vs_lblc_ops);
> + unregister_pernet_device(&ip_vs_lblc_ops);
> }
>
>
> diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
> index 90f618a..5de425f 100644
> --- a/net/netfilter/ipvs/ip_vs_lblcr.c
> +++ b/net/netfilter/ipvs/ip_vs_lblcr.c
> @@ -799,20 +799,20 @@ static int __init ip_vs_lblcr_init(void)
> {
> int ret;
>
> - ret = register_pernet_subsys(&ip_vs_lblcr_ops);
> + ret = register_pernet_device(&ip_vs_lblcr_ops);
> if (ret)
> return ret;
>
> ret = register_ip_vs_scheduler(&ip_vs_lblcr_scheduler);
> if (ret)
> - unregister_pernet_subsys(&ip_vs_lblcr_ops);
> + unregister_pernet_device(&ip_vs_lblcr_ops);
> return ret;
> }
>
> static void __exit ip_vs_lblcr_cleanup(void)
> {
> unregister_ip_vs_scheduler(&ip_vs_lblcr_scheduler);
> - unregister_pernet_subsys(&ip_vs_lblcr_ops);
> + unregister_pernet_device(&ip_vs_lblcr_ops);
> }
>
>
> diff --git a/net/netfilter/ipvs/ip_vs_proto.c b/net/netfilter/ipvs/ip_vs_proto.c
> index 17484a4..f7021fc 100644
> --- a/net/netfilter/ipvs/ip_vs_proto.c
> +++ b/net/netfilter/ipvs/ip_vs_proto.c
> @@ -382,7 +382,7 @@ int __init ip_vs_protocol_init(void)
> REGISTER_PROTOCOL(&ip_vs_protocol_esp);
> #endif
> pr_info("Registered protocols (%s)\n", &protocols[2]);
> - return register_pernet_subsys(&ipvs_proto_ops);
> + return register_pernet_device(&ipvs_proto_ops);
>
> return 0;
> }
> @@ -393,7 +393,7 @@ void ip_vs_protocol_cleanup(void)
> struct ip_vs_protocol *pp;
> int i;
>
> - unregister_pernet_subsys(&ipvs_proto_ops);
> + unregister_pernet_device(&ipvs_proto_ops);
> /* unregister all the ipvs protocols */
> for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
> while ((pp = ip_vs_proto_table[i]) != NULL)
> diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
> index 3f87555..1aeca1d 100644
> --- a/net/netfilter/ipvs/ip_vs_sync.c
> +++ b/net/netfilter/ipvs/ip_vs_sync.c
> @@ -1692,10 +1692,10 @@ static struct pernet_operations ipvs_sync_ops = {
>
> int __init ip_vs_sync_init(void)
> {
> - return register_pernet_subsys(&ipvs_sync_ops);
> + return register_pernet_device(&ipvs_sync_ops);
> }
>
> void ip_vs_sync_cleanup(void)
> {
> - unregister_pernet_subsys(&ipvs_sync_ops);
> + unregister_pernet_device(&ipvs_sync_ops);
> }
--
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