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Subject[PATCH AUTOSEL 3.18 24/98] NFSv4: Cache the NFSv4/v4.1 client owner_id in the struct nfs_client
Date
From: Trond Myklebust <trond.myklebust@primarydata.com>

[ 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.myklebust@primarydata.com>
Signed-off-by: Sasha Levin <sashal@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
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