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Subject[PATCH 2/6] NFS: make NFS client allocated per network namespace context
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This patch adds new net variable to nfs_client structure. This variable is set
on NFS client creation and cheched during matching NFS client search.
Initially current->nsproxy->net_ns is used as network namespace owner for new
NFS client to create. This network namespace pointer is set during mount
options parsing and thus can be passed from user-spave utils in future if will
be necessary.

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

---
fs/nfs/client.c | 16 +++++++++++++---
fs/nfs/internal.h | 1 +
fs/nfs/super.c | 3 +++
include/linux/nfs_fs_sb.h | 1 +
4 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 5833fbb..47a8cd6 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -135,6 +135,7 @@ struct nfs_client_initdata {
const struct nfs_rpc_ops *rpc_ops;
int proto;
u32 minorversion;
+ struct net *net;
};

/*
@@ -189,6 +190,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
if (!IS_ERR(cred))
clp->cl_machine_cred = cred;
nfs_fscache_get_client_cookie(clp);
+ clp->net = cl_init->net;

return clp;

@@ -475,6 +477,9 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat
/* Match the full socket address */
if (!nfs_sockaddr_cmp(sap, clap))
continue;
+ /* Match network namespace */
+ if (clp->net != data->net)
+ continue;

atomic_inc(&clp->cl_count);
return clp;
@@ -825,6 +830,7 @@ static int nfs_init_server(struct nfs_server *server,
.addrlen = data->nfs_server.addrlen,
.rpc_ops = &nfs_v2_clientops,
.proto = data->nfs_server.protocol,
+ .net = data->net,
};
struct rpc_timeout timeparms;
struct nfs_client *clp;
@@ -1386,7 +1392,7 @@ static int nfs4_set_client(struct nfs_server *server,
const char *ip_addr,
rpc_authflavor_t authflavour,
int proto, const struct rpc_timeout *timeparms,
- u32 minorversion)
+ u32 minorversion, struct net *net)
{
struct nfs_client_initdata cl_init = {
.hostname = hostname,
@@ -1395,6 +1401,7 @@ static int nfs4_set_client(struct nfs_server *server,
.rpc_ops = &nfs_v4_clientops,
.proto = proto,
.minorversion = minorversion,
+ .net = net,
};
struct nfs_client *clp;
int error;
@@ -1446,6 +1453,7 @@ struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
.rpc_ops = &nfs_v4_clientops,
.proto = ds_proto,
.minorversion = mds_clp->cl_minorversion,
+ .net = mds_clp->net,
};
struct rpc_timeout ds_timeout = {
.to_initval = 15 * HZ,
@@ -1572,7 +1580,8 @@ static int nfs4_init_server(struct nfs_server *server,
data->auth_flavors[0],
data->nfs_server.protocol,
&timeparms,
- data->minorversion);
+ data->minorversion,
+ data->net);
if (error < 0)
goto error;

@@ -1669,7 +1678,8 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
data->authflavor,
parent_server->client->cl_xprt->prot,
parent_server->client->cl_timeout,
- parent_client->cl_mvops->minor_version);
+ parent_client->cl_mvops->minor_version,
+ parent_client->net);
if (error < 0)
goto error;

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ab12913..4565e76 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -123,6 +123,7 @@ struct nfs_parsed_mount_data {
} nfs_server;

struct security_mnt_opts lsm_opts;
+ struct net *net;
};

/* mount_clnt.c */
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 5b19b6a..782260d 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -53,6 +53,7 @@
#include <linux/nfs_xdr.h>
#include <linux/magic.h>
#include <linux/parser.h>
+#include <linux/nsproxy.h>

#include <asm/system.h>
#include <asm/uaccess.h>
@@ -1089,6 +1090,8 @@ static int nfs_parse_mount_options(char *raw,

free_secdata(secdata);

+ mnt->net = current->nsproxy->net_ns;
+
while ((p = strsep(&raw, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
unsigned long option;
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index b5479df..71fd605 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -85,6 +85,7 @@ struct nfs_client {
#endif

struct server_scope *server_scope; /* from exchange_id */
+ struct net *net;
};

/*


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