nfsd: make NFSv4 recovery client tracking options per net

Pointer to client tracking operations - client_tracking_ops - have to be
containerized, because different environment can support different trackers
(for example, legacy tracker currently is not suported in container).

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 30 insertions, 20 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 964b5542f02..fac4123c918 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -35,6 +35,7 @@
 #define SESSION_HASH_SIZE       512
 
 struct cld_net;
+struct nfsd4_client_tracking_ops;
 
 struct nfsd_net {
         struct cld_net *cld_net;
@@ -87,6 +88,7 @@ struct nfsd_net {
 
         struct file *rec_file;
         bool in_grace;
+        struct nfsd4_client_tracking_ops *client_tracking_ops;
 
         time_t nfsd4_lease;
         time_t nfsd4_grace;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 359793f8949..ba6fdd4a045 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -63,7 +63,6 @@ struct nfsd4_client_tracking_ops {
 
 /* Globals */
 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
-static struct nfsd4_client_tracking_ops *client_tracking_ops;
 
 static int
 nfs4_save_creds(const struct cred **original_creds)
@@ -1262,17 +1261,18 @@ nfsd4_client_tracking_init(struct net *net)
 {
         int status;
         struct path path;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
         /* just run the init if it the method is already decided */
-        if (client_tracking_ops)
+        if (nn->client_tracking_ops)
                 goto do_init;
 
         /*
          * First, try a UMH upcall. It should succeed or fail quickly, so
          * there's little harm in trying that first.
          */
-        client_tracking_ops = &nfsd4_umh_tracking_ops;
-        status = client_tracking_ops->init(net);
+        nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
+        status = nn->client_tracking_ops->init(net);
         if (!status)
                 return status;
 
@@ -1280,7 +1280,7 @@ nfsd4_client_tracking_init(struct net *net)
          * See if the recoverydir exists and is a directory. If it is,
          * then use the legacy ops.
          */
-        client_tracking_ops = &nfsd4_legacy_tracking_ops;
+        nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
         status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
         if (!status) {
                 status = S_ISDIR(path.dentry->d_inode->i_mode);
@@ -1290,16 +1290,16 @@ nfsd4_client_tracking_init(struct net *net)
         }
 
         /* Finally, try to use nfsdcld */
-        client_tracking_ops = &nfsd4_cld_tracking_ops;
+        nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
         printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
                         "removed in 3.10. Please transition to using "
                         "nfsdcltrack.\n");
 do_init:
-        status = client_tracking_ops->init(net);
+        status = nn->client_tracking_ops->init(net);
         if (status) {
                 printk(KERN_WARNING "NFSD: Unable to initialize client "
                                     "recovery tracking! (%d)\n", status);
-                client_tracking_ops = NULL;
+                nn->client_tracking_ops = NULL;
         }
         return status;
 }
@@ -1307,32 +1307,40 @@ do_init:
 void
 nfsd4_client_tracking_exit(struct net *net)
 {
-        if (client_tracking_ops) {
-                if (client_tracking_ops->exit)
-                        client_tracking_ops->exit(net);
-                client_tracking_ops = NULL;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+        if (nn->client_tracking_ops) {
+                if (nn->client_tracking_ops->exit)
+                        nn->client_tracking_ops->exit(net);
+                nn->client_tracking_ops = NULL;
         }
 }
 
 void
 nfsd4_client_record_create(struct nfs4_client *clp)
 {
-        if (client_tracking_ops)
-                client_tracking_ops->create(clp);
+        struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+        if (nn->client_tracking_ops)
+                nn->client_tracking_ops->create(clp);
 }
 
 void
 nfsd4_client_record_remove(struct nfs4_client *clp)
 {
-        if (client_tracking_ops)
-                client_tracking_ops->remove(clp);
+        struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+        if (nn->client_tracking_ops)
+                nn->client_tracking_ops->remove(clp);
 }
 
 int
 nfsd4_client_record_check(struct nfs4_client *clp)
 {
-        if (client_tracking_ops)
-                return client_tracking_ops->check(clp);
+        struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+        if (nn->client_tracking_ops)
+                return nn->client_tracking_ops->check(clp);
 
         return -EOPNOTSUPP;
 }
@@ -1340,8 +1348,8 @@ nfsd4_client_record_check(struct nfs4_client *clp)
 void
 nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
 {
-        if (client_tracking_ops)
-                client_tracking_ops->grace_done(nn, boot_time);
+        if (nn->client_tracking_ops)
+                nn->client_tracking_ops->grace_done(nn, boot_time);
 }
 
 static int