[PATCH 05/15] nfsd: make conf_str_hashtbl allocated per net

[Stanislav Kinsbursky <skinsbursky@parallels.com>]

This hash holds nfs4_clients info, which are network namespace aware.
So let's make it allocated per network namespace.

Note: this hash can be allocated in per-net operations. But it looks
better to allocate it on nfsd state start and thus don't waste resources if
server is not running.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
---
 fs/nfsd/netns.h       |    5 +++++
 fs/nfsd/nfs4recover.c |    2 +-
 fs/nfsd/nfs4state.c   |   40 ++++++++++++++++++++++++----------------
 fs/nfsd/state.h       |    2 +-
 4 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 0cc85e9..61f41c0 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -47,10 +47,15 @@ struct nfsd_net {
 	/*
 	 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 	 * used in reboot/reset lease grace period processing
+	 *
+	 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
+	 * setclientid_confirmed info.
+	 *
 	 */
 	struct list_head *reclaim_str_hashtbl;
 	int reclaim_str_hashtbl_size;
 	struct list_head *conf_id_hashtbl;
+	struct list_head *conf_str_hashtbl;
 };
 
 extern int nfsd_net_id;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index fc782b5..ac79dd7 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -320,7 +320,7 @@ purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
 {
 	int status;
 
-	if (nfs4_has_reclaimed_state(child->d_name.name))
+	if (nfs4_has_reclaimed_state(child->d_name.name, nn))
 		return 0;
 
 	status = vfs_rmdir(parent->d_inode, child);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 74d047e..a709dd2 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -404,9 +404,6 @@ static unsigned int clientstr_hashval(const char *name)
 }
 
 /*
- * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
- * setclientid_confirmed info. 
- *
  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
  * setclientid info.
  *
@@ -416,7 +413,6 @@ static unsigned int clientstr_hashval(const char *name)
  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
  * for last close replay.
  */
-static struct list_head	conf_str_hashtbl[CLIENT_HASH_SIZE];
 static struct list_head	unconf_str_hashtbl[CLIENT_HASH_SIZE];
 static struct list_head	unconf_id_hashtbl[CLIENT_HASH_SIZE];
 static struct list_head client_lru;
@@ -1335,7 +1331,7 @@ move_to_confirmed(struct nfs4_client *clp)
 	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 	list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
 	strhashval = clientstr_hashval(clp->cl_recdir);
-	list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
+	list_move(&clp->cl_strhash, &nn->conf_str_hashtbl[strhashval]);
 	renew_client(clp);
 }
 
@@ -1378,11 +1374,12 @@ static bool clp_used_exchangeid(struct nfs4_client *clp)
 } 
 
 static struct nfs4_client *
-find_confirmed_client_by_str(const char *dname, unsigned int hashval)
+find_confirmed_client_by_str(const char *dname, unsigned int hashval,
+			     struct nfsd_net *nn)
 {
 	struct nfs4_client *clp;
 
-	list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
+	list_for_each_entry(clp, &nn->conf_str_hashtbl[hashval], cl_strhash) {
 		if (same_name(clp->cl_recdir, dname))
 			return clp;
 	}
@@ -1601,7 +1598,7 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
 
 	/* Cases below refer to rfc 5661 section 18.35.4: */
 	nfs4_lock_state();
-	conf = find_confirmed_client_by_str(dname, strhashval);
+	conf = find_confirmed_client_by_str(dname, strhashval, nn);
 	if (conf) {
 		bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
 		bool verfs_match = same_verf(&verf, &conf->cl_verifier);
@@ -1797,7 +1794,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 			goto out_free_conn;
 		}
 		hash = clientstr_hashval(unconf->cl_recdir);
-		old = find_confirmed_client_by_str(unconf->cl_recdir, hash);
+		old = find_confirmed_client_by_str(unconf->cl_recdir, hash, nn);
 		if (old)
 			expire_client(old);
 		move_to_confirmed(unconf);
@@ -2203,7 +2200,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	/* Cases below refer to rfc 3530 section 14.2.33: */
 	nfs4_lock_state();
-	conf = find_confirmed_client_by_str(dname, strhashval);
+	conf = find_confirmed_client_by_str(dname, strhashval, nn);
 	if (conf) {
 		/* case 0: */
 		status = nfserr_clid_inuse;
@@ -2287,7 +2284,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 	} else { /* case 3: normal case; new or rebooted client */
 		unsigned int hash = clientstr_hashval(unconf->cl_recdir);
 
-		conf = find_confirmed_client_by_str(unconf->cl_recdir, hash);
+		conf = find_confirmed_client_by_str(unconf->cl_recdir, hash, nn);
 		if (conf)
 			expire_client(conf);
 		move_to_confirmed(unconf);
@@ -4480,12 +4477,12 @@ alloc_reclaim(void)
 }
 
 int
-nfs4_has_reclaimed_state(const char *name)
+nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
 {
 	unsigned int strhashval = clientstr_hashval(name);
 	struct nfs4_client *clp;
 
-	clp = find_confirmed_client_by_str(name, strhashval);
+	clp = find_confirmed_client_by_str(name, strhashval, nn);
 	if (!clp)
 		return 0;
 	return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
@@ -4703,7 +4700,6 @@ nfs4_state_init(void)
 	int i;
 
 	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
-		INIT_LIST_HEAD(&conf_str_hashtbl[i]);
 		INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
 		INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
 	}
@@ -4751,12 +4747,23 @@ static int nfs4_state_start_net(struct net *net)
 	nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
 			CLIENT_HASH_SIZE, GFP_KERNEL);
 	if (!nn->conf_id_hashtbl)
-		return -ENOMEM;
+		goto err;
+	nn->conf_str_hashtbl = kmalloc(sizeof(struct list_head) *
+			CLIENT_HASH_SIZE, GFP_KERNEL);
+	if (!nn->conf_str_hashtbl)
+		goto err_conf_str;
 
-	for (i = 0; i < CLIENT_HASH_SIZE; i++)
+	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
 		INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
+		INIT_LIST_HEAD(&nn->conf_str_hashtbl[i]);
+	}
 
 	return 0;
+
+err_conf_str:
+	kfree(nn->conf_id_hashtbl);
+err:
+	return -ENOMEM;
 }
 
 static void
@@ -4772,6 +4779,7 @@ __nfs4_state_shutdown_net(struct net *net)
 			destroy_client(clp);
 		}
 	}
+	kfree(nn->conf_str_hashtbl);
 	kfree(nn->conf_id_hashtbl);
 }
 
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index da78804..f350805 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -483,7 +483,7 @@ extern void nfsd4_shutdown_callback(struct nfs4_client *);
 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
 extern int nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn);
-extern int nfs4_has_reclaimed_state(const char *name);
+extern int nfs4_has_reclaimed_state(const char *name, struct nfsd_net *);
 extern void release_session_client(struct nfsd4_session *);
 extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);