nfs: fix RCU cl_xprt handling in nfs_swap_activate/deactivate

sparse says:

fs/nfs/file.c:543:60: warning: incorrect type in argument 1 (different address spaces)
fs/nfs/file.c:543:60:    expected struct rpc_xprt *xprt
fs/nfs/file.c:543:60:    got struct rpc_xprt [noderef] <asn:4>*cl_xprt
fs/nfs/file.c:548:53: warning: incorrect type in argument 1 (different address spaces)
fs/nfs/file.c:548:53:    expected struct rpc_xprt *xprt
fs/nfs/file.c:548:53:    got struct rpc_xprt [noderef] <asn:4>*cl_xprt

cl_xprt is RCU-managed, so we need to take care to dereference and use
it while holding the RCU read lock.

Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 05ef7dcc5f21..23e5f0ea5c83 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -546,13 +546,25 @@ static int nfs_launder_page(struct page *page)
 static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
                                                 sector_t *span)
 {
+        int ret;
+        struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
+
         *span = sis->pages;
-        return xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 1);
+
+        rcu_read_lock();
+        ret = xs_swapper(rcu_dereference(clnt->cl_xprt), 1);
+        rcu_read_unlock();
+
+        return ret;
 }
 
 static void nfs_swap_deactivate(struct file *file)
 {
-        xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 0);
+        struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
+
+        rcu_read_lock();
+        xs_swapper(rcu_dereference(clnt->cl_xprt), 0);
+        rcu_read_unlock();
 }
 #endif