NFS: add hooks to account for NFSERR_JUKEBOX errors

Make an inode or an nfs_server struct available in the logic that handles
JUKEBOX/DELAY type errors so the NFS client can account for them.

This patch is split out from the main nfs iostat patch to highlight minor
architectural changes required to support this statistic.

Test plan:
None.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 77a565eba562..f1ff4fa6cce5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -51,6 +51,7 @@
 
 #include "nfs4_fs.h"
 #include "delegation.h"
+#include "iostat.h"
 
 #define NFSDBG_FACILITY         NFSDBG_PROC
 
@@ -2755,8 +2756,10 @@ nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
                                 rpc_wake_up_task(task);
                         task->tk_status = 0;
                         return -EAGAIN;
-                case -NFS4ERR_GRACE:
                 case -NFS4ERR_DELAY:
+                        nfs_inc_server_stats((struct nfs_server *) server,
+                                                NFSIOS_DELAY);
+                case -NFS4ERR_GRACE:
                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
                         task->tk_status = 0;
                         return -EAGAIN;