NFSv4.1 send layoutreturn to fence disconnected data server

Let the MDS know that you are redirecting I/O from pNFS to MDS.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index a63062d..c6b7c18 100644 (file)
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -186,6 +186,8 @@ static int filelayout_async_handle_error(struct rpc_task *task,
        case -EPIPE:
                dprintk("%s DS connection error %d\n", __func__,
                        task->tk_status);
+               if (!filelayout_test_devid_invalid(devid))
+                       _pnfs_return_layout(state->inode);
                filelayout_mark_devid_invalid(devid);
                rpc_wake_up(&tbl->slot_tbl_waitq);
                /* fall through */

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 16cc194..e48017f 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -692,6 +692,7 @@ out:
        dprintk("<-- %s status: %d\n", __func__, status);
        return status;
 }
+EXPORT_SYMBOL_GPL(_pnfs_return_layout);
 
 bool pnfs_roc(struct inode *ino)
 {