[PATCH 3.18 054/144] NFSv4: Cache the NFSv4/v4.1 client owner_id in the struct nfs_client

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit ceb3a16c070c403f5f9ca46b46cf2bb79ea11750 ]

Ensure that we cache the NFSv4/v4.1 client owner_id so that we can
verify it when we're doing trunking detection.

Signed-off-by: Trond Myklebust <trond.mykleb...@primarydata.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 fs/nfs/nfs4client.c       |  1 +
 fs/nfs/nfs4proc.c         | 19 +++++++++++++++----
 include/linux/nfs_fs_sb.h |  3 +++
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 723c656ebd28..d748d403bab1 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -228,6 +228,7 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
        kfree(clp->cl_serverowner);
        kfree(clp->cl_serverscope);
        kfree(clp->cl_implid);
+       kfree(clp->cl_owner_id);
 }
 
 void nfs4_free_client(struct nfs_client *clp)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 321044c183f5..db8456b4ecb8 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4913,11 +4913,14 @@ static void nfs4_init_boot_verifier(const struct 
nfs_client *clp,
 }
 
 static unsigned int
-nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
+nfs4_init_nonuniform_client_string(struct nfs_client *clp,
                                   char *buf, size_t len)
 {
        unsigned int result;
 
+       if (clp->cl_owner_id != NULL)
+               return strlcpy(buf, clp->cl_owner_id, len);
+
        rcu_read_lock();
        result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
                                clp->cl_ipaddr,
@@ -4926,24 +4929,32 @@ nfs4_init_nonuniform_client_string(const struct 
nfs_client *clp,
                                rpc_peeraddr2str(clp->cl_rpcclient,
                                                        RPC_DISPLAY_PROTO));
        rcu_read_unlock();
+       clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
        return result;
 }
 
 static unsigned int
-nfs4_init_uniform_client_string(const struct nfs_client *clp,
+nfs4_init_uniform_client_string(struct nfs_client *clp,
                                char *buf, size_t len)
 {
        const char *nodename = clp->cl_rpcclient->cl_nodename;
+       unsigned int result;
+
+       if (clp->cl_owner_id != NULL)
+               return strlcpy(buf, clp->cl_owner_id, len);
 
        if (nfs4_client_id_uniquifier[0] != '\0')
-               return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
+               result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
                                clp->rpc_ops->version,
                                clp->cl_minorversion,
                                nfs4_client_id_uniquifier,
                                nodename);
-       return scnprintf(buf, len, "Linux NFSv%u.%u %s",
+       else
+               result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
                                clp->rpc_ops->version, clp->cl_minorversion,
                                nodename);
+       clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
+       return result;
 }
 
 /*
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index fd249ab2718f..4ac99c07406a 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -74,6 +74,9 @@ struct nfs_client {
        /* idmapper */
        struct idmap *          cl_idmap;
 
+       /* Client owner identifier */
+       const char *            cl_owner_id;
+
        /* Our own IP address, as a null-terminated string.
         * This is used to generate the mv0 callback address.
         */
-- 
2.17.1