[PATCH 2/5] SUNRPC: create unix gid cache per network namespace
From: Stanislav Kinsbursky <hidden>
Date: 2012-01-19 14:49:35
Also in:
linux-nfs, lkml
Subsystem:
kernel nfsd, sunrpc, and lockd servers, networking [general], nfs, sunrpc, and lockd clients, the rest · Maintainers:
Chuck Lever, Jeff Layton, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Trond Myklebust, Anna Schumaker, Linus Torvalds
This patch makes unix_gid_cache cache detail allocated and registered per network namespace context. Thus with this patch unix_gid_cache contents for network namespace "X" are controlled from proc file system mount for the same network namespace "X". Signed-off-by: Stanislav Kinsbursky <redacted> --- net/sunrpc/netns.h | 1 + net/sunrpc/sunrpc_syms.c | 14 ++++++++++---- net/sunrpc/svcauth_unix.c | 36 +++++++++++++++++++++++++++++++----- 3 files changed, 42 insertions(+), 9 deletions(-)
diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index 1fdeb1b..309f88d 100644
--- a/net/sunrpc/netns.h
+++ b/net/sunrpc/netns.h@@ -9,6 +9,7 @@ struct cache_detail; struct sunrpc_net { struct proc_dir_entry *proc_net_rpc; struct cache_detail *ip_map_cache; + struct cache_detail *unix_gid_cache; struct super_block *pipefs_sb; struct mutex pipefs_sb_lock;
diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index b4217dc..38a72a1 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c@@ -26,6 +26,9 @@ int sunrpc_net_id; +extern int unix_gid_cache_create(struct net *net); +extern int unix_gid_cache_destroy(struct net *net); + static __net_init int sunrpc_init_net(struct net *net) { int err;
@@ -39,11 +42,17 @@ static __net_init int sunrpc_init_net(struct net *net) if (err) goto err_ipmap; + err = unix_gid_cache_create(net); + if (err) + goto err_unixgid; + rpc_pipefs_init_net(net); INIT_LIST_HEAD(&sn->all_clients); spin_lock_init(&sn->rpc_client_lock); return 0; +err_unixgid: + ip_map_cache_destroy(net); err_ipmap: rpc_proc_exit(net); err_proc:
@@ -52,6 +61,7 @@ err_proc: static __net_exit void sunrpc_exit_net(struct net *net) { + unix_gid_cache_destroy(net); ip_map_cache_destroy(net); rpc_proc_exit(net); }
@@ -63,8 +73,6 @@ static struct pernet_operations sunrpc_net_ops = { .size = sizeof(struct sunrpc_net), }; -extern struct cache_detail unix_gid_cache; - static int __init init_sunrpc(void) {
@@ -86,7 +94,6 @@ init_sunrpc(void) #ifdef RPC_DEBUG rpc_register_sysctl(); #endif - cache_register(&unix_gid_cache); svc_init_xprt_sock(); /* svc sock transport */ init_socket_xprt(); /* clnt sock transport */ return 0;
@@ -109,7 +116,6 @@ cleanup_sunrpc(void) svc_cleanup_xprt_sock(); unregister_rpc_pipefs(); rpc_destroy_mempool(); - cache_unregister(&unix_gid_cache); unregister_pernet_subsys(&sunrpc_net_ops); #ifdef RPC_DEBUG rpc_unregister_sysctl();
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 2f8c426..c753ae4 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c@@ -436,7 +436,6 @@ struct unix_gid { uid_t uid; struct group_info *gi; }; -static struct cache_head *gid_table[GID_HASHMAX]; static void unix_gid_put(struct kref *kref) {
@@ -495,7 +494,6 @@ static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h) } static struct unix_gid *unix_gid_lookup(uid_t uid); -extern struct cache_detail unix_gid_cache; static int unix_gid_parse(struct cache_detail *cd, char *mesg, int mlen)
@@ -544,14 +542,14 @@ static int unix_gid_parse(struct cache_detail *cd, struct cache_head *ch; ug.h.flags = 0; ug.h.expiry_time = expiry; - ch = sunrpc_cache_update(&unix_gid_cache, + ch = sunrpc_cache_update(cd, &ug.h, &ugp->h, hash_long(uid, GID_HASHBITS)); if (!ch) err = -ENOMEM; else { err = 0; - cache_put(ch, &unix_gid_cache); + cache_put(ch, cd); } } else err = -ENOMEM;
@@ -590,7 +588,6 @@ static int unix_gid_show(struct seq_file *m, struct cache_detail unix_gid_cache = { .owner = THIS_MODULE, .hash_size = GID_HASHMAX, - .hash_table = gid_table, .name = "auth.unix.gid", .cache_put = unix_gid_put, .cache_upcall = unix_gid_upcall,
@@ -602,6 +599,35 @@ struct cache_detail unix_gid_cache = { .alloc = unix_gid_alloc, }; +int unix_gid_cache_create(struct net *net) +{ + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + struct cache_detail *cd; + int err; + + cd = cache_create_net(&unix_gid_cache, net); + if (IS_ERR(cd)) + return PTR_ERR(cd); + err = cache_register_net(cd, net); + if (err) { + cache_destroy_net(&unix_gid_cache, net); + return err; + } + sn->unix_gid_cache = cd; + return 0; +} + +void unix_gid_cache_destroy(struct net *net) +{ + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + struct cache_detail *cd = sn->unix_gid_cache; + + sn->unix_gid_cache = NULL; + cache_purge(cd); + cache_unregister_net(cd, net); + cache_destroy_net(cd, net); +} + static struct unix_gid *unix_gid_lookup(uid_t uid) { struct unix_gid ug;