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Extract the net namespace sysctl registration and unregistration logic from rds_tcp_init_net() and rds_tcp_exit_net() into new helpers. This also simplifies the error paths in rds_tcp_init_net(); it can use rds_tcp_exit_net_sysctl() too. Signed-off-by: Oleg Nesterov Reviewed-by: Allison Henderson Tested-by: Allison Henderson --- net/rds/tcp.c | 93 ++++++++++++++++++++++++++++----------------------- 1 file changed, 52 insertions(+), 41 deletions(-) diff --git a/net/rds/tcp.c b/net/rds/tcp.c index c1ad37505417..d6c542371611 100644 --- a/net/rds/tcp.c +++ b/net/rds/tcp.c @@ -82,6 +82,52 @@ static struct ctl_table rds_tcp_sysctl_table[] = { }, }; +static __net_init int rds_tcp_init_net_sysctl(struct net *net) +{ + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + struct ctl_table *tbl; + + /* {snd, rcv}buf_size default to 0, which implies we let the + * stack pick the value, and permit auto-tuning of buffer size. + */ + if (net == &init_net) { + tbl = rds_tcp_sysctl_table; + } else { + tbl = kmemdup(rds_tcp_sysctl_table, + sizeof(rds_tcp_sysctl_table), GFP_KERNEL); + if (!tbl) { + pr_warn("could not allocate sysctl table\n"); + return -ENOMEM; + } + rtn->ctl_table = tbl; + } + tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; + tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; + rtn->rds_tcp_sysctl = register_net_sysctl_sz(net, "net/rds/tcp", tbl, + ARRAY_SIZE(rds_tcp_sysctl_table)); + if (!rtn->rds_tcp_sysctl && IS_ENABLED(CONFIG_SYSCTL)) { + pr_warn("could not register sysctl\n"); + if (net != &init_net) + kfree(tbl); + return -ENOMEM; + } + + return 0; +} + +static void __net_exit rds_tcp_exit_net_sysctl(struct net *net) +{ + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + + if (rtn->rds_tcp_sysctl) { + unregister_net_sysctl_table(rtn->rds_tcp_sysctl); + rtn->rds_tcp_sysctl = NULL; + } + + if (net != &init_net) + kfree(rtn->ctl_table); +} + u32 rds_tcp_write_seq(struct rds_tcp_connection *tc) { /* seq# of the last byte of data in tcp send buffer */ @@ -612,36 +658,15 @@ void rds_tcp_accept_work(struct rds_tcp_net *rtn) static __net_init int rds_tcp_init_net(struct net *net) { struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); - struct ctl_table *tbl; int err = 0; memset(rtn, 0, sizeof(*rtn)); mutex_init(&rtn->rds_tcp_accept_lock); - /* {snd, rcv}buf_size default to 0, which implies we let the - * stack pick the value, and permit auto-tuning of buffer size. - */ - if (net == &init_net) { - tbl = rds_tcp_sysctl_table; - } else { - tbl = kmemdup(rds_tcp_sysctl_table, - sizeof(rds_tcp_sysctl_table), GFP_KERNEL); - if (!tbl) { - pr_warn("could not set allocate sysctl table\n"); - return -ENOMEM; - } - rtn->ctl_table = tbl; - } - tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; - tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; - rtn->rds_tcp_sysctl = register_net_sysctl_sz(net, "net/rds/tcp", tbl, - ARRAY_SIZE(rds_tcp_sysctl_table)); - if (!rtn->rds_tcp_sysctl && IS_ENABLED(CONFIG_SYSCTL)) { - pr_warn("could not register sysctl\n"); - err = -ENOMEM; - goto fail; - } + err = rds_tcp_init_net_sysctl(net); + if (err) + return err; #if IS_ENABLED(CONFIG_IPV6) rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, true); @@ -656,21 +681,14 @@ static __net_init int rds_tcp_init_net(struct net *net) rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false); if (!rtn->rds_tcp_listen_sock) { #endif - unregister_net_sysctl_table(rtn->rds_tcp_sysctl); - rtn->rds_tcp_sysctl = NULL; - err = -EAFNOSUPPORT; - goto fail; + rds_tcp_exit_net_sysctl(net); + return -EAFNOSUPPORT; #if IS_ENABLED(CONFIG_IPV6) } #endif } INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); return 0; - -fail: - if (net != &init_net) - kfree(tbl); - return err; } static void rds_tcp_kill_sock(struct net *net) @@ -704,14 +722,7 @@ static void rds_tcp_kill_sock(struct net *net) static void __net_exit rds_tcp_exit_net(struct net *net) { - struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); - - if (rtn->rds_tcp_sysctl) - unregister_net_sysctl_table(rtn->rds_tcp_sysctl); - - if (net != &init_net) - kfree(rtn->ctl_table); - + rds_tcp_exit_net_sysctl(net); rds_tcp_kill_sock(net); } -- 2.55.0