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Subject[PATCH 4/4] NFS: make nfs_client_lock per net ns
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This patch makes nfs_clients_lock allocated per network namespace. All items it
protects are already network namespace aware.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

---
fs/nfs/client.c | 51 +++++++++++++++++++++++++++++----------------------
fs/nfs/idmap.c | 4 ++--
fs/nfs/internal.h | 3 ---
fs/nfs/netns.h | 1 +
4 files changed, 32 insertions(+), 27 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index f51b279..9e11d29 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -55,7 +55,6 @@

#define NFSDBG_FACILITY NFSDBG_CLIENT

-DEFINE_SPINLOCK(nfs_client_lock);
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
#ifdef CONFIG_NFS_V4

@@ -73,9 +72,9 @@ static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
retry:
if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
return -ENOMEM;
- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);
if (ret == -EAGAIN)
goto retry;
return ret;
@@ -313,15 +312,18 @@ static void nfs_free_client(struct nfs_client *clp)
*/
void nfs_put_client(struct nfs_client *clp)
{
+ struct nfs_net *nn;
+
if (!clp)
return;

dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
+ nn = net_generic(clp->net, nfs_net_id);

- if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
+ if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
list_del(&clp->cl_share_link);
nfs_cb_idr_remove_locked(clp);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

BUG_ON(!list_empty(&clp->cl_superblocks));

@@ -516,7 +518,7 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,

/* see if the client already exists */
do {
- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);

clp = nfs_match_client(cl_init);
if (clp)
@@ -524,7 +526,7 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
if (new)
goto install_client;

- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

new = nfs_alloc_client(cl_init);
} while (!IS_ERR(new));
@@ -536,7 +538,7 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
install_client:
clp = new;
list_add(&clp->cl_share_link, &nn->nfs_client_list);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
authflavour, noresvport);
@@ -551,7 +553,7 @@ install_client:
* - make sure it's ready before returning
*/
found_client:
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

if (new)
nfs_free_client(new);
@@ -1041,24 +1043,25 @@ static void nfs_server_insert_lists(struct nfs_server *server)
struct nfs_client *clp = server->nfs_client;
struct nfs_net *nn = net_generic(clp->net, nfs_net_id);

- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
list_add_tail(&server->master_link, &nn->nfs_volume_list);
clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

}

static void nfs_server_remove_lists(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
+ struct nfs_net *nn = net_generic(clp->net, nfs_net_id);

- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
list_del_rcu(&server->client_link);
if (clp && list_empty(&clp->cl_superblocks))
set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
list_del(&server->master_link);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);

synchronize_rcu();
}
@@ -1212,11 +1215,11 @@ nfs4_find_client_ident(struct net *net, int cb_ident)
struct nfs_client *clp;
struct nfs_net *nn = net_generic(net, nfs_net_id);

- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
clp = idr_find(&nn->cb_ident_idr, cb_ident);
if (clp)
atomic_inc(&clp->cl_count);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);
return clp;
}

@@ -1235,7 +1238,7 @@ nfs4_find_client_sessionid(const struct sockaddr *addr,
struct nfs_client *clp;
struct nfs_net *nn = net_generic(&init_net, nfs_net_id);

- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
if (nfs4_cb_match_client(addr, clp, 1) == false)
continue;
@@ -1249,10 +1252,10 @@ nfs4_find_client_sessionid(const struct sockaddr *addr,
continue;

atomic_inc(&clp->cl_count);
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);
return clp;
}
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);
return NULL;
}

@@ -1849,7 +1852,7 @@ static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
struct nfs_net *nn = net_generic(m->private, nfs_net_id);

/* lock the list against modification */
- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
return seq_list_start_head(&nn->nfs_client_list, *_pos);
}

@@ -1868,7 +1871,9 @@ static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
*/
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
- spin_unlock(&nfs_client_lock);
+ struct nfs_net *nn = net_generic(p->private, nfs_net_id);
+
+ spin_unlock(&nn->nfs_client_lock);
}

/*
@@ -1930,7 +1935,7 @@ static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
struct nfs_net *nn = net_generic(m->private, nfs_net_id);

/* lock the list against modification */
- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
return seq_list_start_head(&nn->nfs_volume_list, *_pos);
}

@@ -1949,7 +1954,9 @@ static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
*/
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
- spin_unlock(&nfs_client_lock);
+ struct nfs_net *nn = net_generic(p->private, nfs_net_id);
+
+ spin_unlock(&nn->nfs_client_lock);
}

/*
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 92deaf8..aed3d2e 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -575,7 +575,7 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
struct nfs_client *clp;
int error = 0;

- spin_lock(&nfs_client_lock);
+ spin_lock(&nn->nfs_client_lock);
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
if (clp->rpc_ops != &nfs_v4_clientops)
continue;
@@ -583,7 +583,7 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
if (error)
break;
}
- spin_unlock(&nfs_client_lock);
+ spin_unlock(&nn->nfs_client_lock);
return error;
}

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 958fff2..b38b733 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -182,9 +182,6 @@ static inline void nfs_fs_proc_exit(void)
{
}
#endif
-#ifdef CONFIG_NFS_V4
-extern spinlock_t nfs_client_lock;
-#endif

/* nfs4namespace.c */
#ifdef CONFIG_NFS_V4
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
index 547cc95..7baad89 100644
--- a/fs/nfs/netns.h
+++ b/fs/nfs/netns.h
@@ -12,6 +12,7 @@ struct nfs_net {
#ifdef CONFIG_NFS_V4
struct idr cb_ident_idr; /* Protected by nfs_client_lock */
#endif
+ spinlock_t nfs_client_lock;
};

extern int nfs_net_id;


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