SUNRPC: create unix gid cache per network namespace

v2:
1) fixed silly usage of template cache as a real one (this code left from
static global cache for all)

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 <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index 1fdeb1b..309f88d 100644 (file)
--- 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 (file)
--- 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..a6eef38 100644 (file)
--- 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)
 {
@@ -494,8 +493,7 @@ static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
        return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
 }
 
-static struct unix_gid *unix_gid_lookup(uid_t uid);
-extern struct cache_detail unix_gid_cache;
+static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid);
 
 static int unix_gid_parse(struct cache_detail *cd,
                        char *mesg, int mlen)
@@ -539,19 +537,19 @@ static int unix_gid_parse(struct cache_detail *cd,
                GROUP_AT(ug.gi, i) = gid;
        }
 
-       ugp = unix_gid_lookup(uid);
+       ugp = unix_gid_lookup(cd, uid);
        if (ugp) {
                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;
@@ -587,10 +585,9 @@ static int unix_gid_show(struct seq_file *m,
        return 0;
 }
 
-struct cache_detail unix_gid_cache = {
+static struct cache_detail unix_gid_cache_template = {
        .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,
@@ -602,14 +599,42 @@ struct cache_detail unix_gid_cache = {
        .alloc          = unix_gid_alloc,
 };
 
-static struct unix_gid *unix_gid_lookup(uid_t uid)
+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_template, net);
+       if (IS_ERR(cd))
+               return PTR_ERR(cd);
+       err = cache_register_net(cd, net);
+       if (err) {
+               cache_destroy_net(cd, 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(struct cache_detail *cd, uid_t uid)
 {
        struct unix_gid ug;
        struct cache_head *ch;
 
        ug.uid = uid;
-       ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
-                                hash_long(uid, GID_HASHBITS));
+       ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
        if (ch)
                return container_of(ch, struct unix_gid, h);
        else
@@ -621,11 +646,13 @@ static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
        struct unix_gid *ug;
        struct group_info *gi;
        int ret;
+       struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
+                                           sunrpc_net_id);
 
-       ug = unix_gid_lookup(uid);
+       ug = unix_gid_lookup(sn->unix_gid_cache, uid);
        if (!ug)
                return ERR_PTR(-EAGAIN);
-       ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
+       ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
        switch (ret) {
        case -ENOENT:
                return ERR_PTR(-ENOENT);
@@ -633,7 +660,7 @@ static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
                return ERR_PTR(-ESHUTDOWN);
        case 0:
                gi = get_group_info(ug->gi);
-               cache_put(&ug->h, &unix_gid_cache);
+               cache_put(&ug->h, sn->unix_gid_cache);
                return gi;
        default:
                return ERR_PTR(-EAGAIN);