NFSv4.1: turn off pNFS on ds connection failure

If a data server is unavailable, go through MDS.

Mark the deviceid containing the data server as a negative cache entry.
Do not try to connect to any data server on a deviceid marked as a negative
cache entry. Mark any layout that tries to use the marked deviceid as failed.

Inodes with a layout marked as fails will not use the layout for I/O, and will
not perform any more layoutgets.
Inodes without a layout will still do layoutget, but the layout will get
marked immediately.

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

1 files changed, 24 insertions, 4 deletions

diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index f594ca35a996..68143c162e3b 100644
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -606,6 +606,21 @@ nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
         return flseg->fh_array[i];
 }
 
+static void
+filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr,
+                               int err, u32 ds_addr)
+{
+        u32 *p = (u32 *)&dsaddr->deviceid;
+
+        printk(KERN_ERR "NFS: data server %x connection error %d."
+                " Deviceid [%x%x%x%x] marked out of use.\n",
+                ds_addr, err, p[0], p[1], p[2], p[3]);
+
+        spin_lock(&filelayout_deviceid_lock);
+        dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY;
+        spin_unlock(&filelayout_deviceid_lock);
+}
+
 struct nfs4_pnfs_ds *
 nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
 {
@@ -619,13 +634,18 @@ nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
         }
 
         if (!ds->ds_clp) {
+                struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
                 int err;
 
-                err = nfs4_ds_connect(NFS_SERVER(lseg->pls_layout->plh_inode),
-                                          dsaddr->ds_list[ds_idx]);
+                if (dsaddr->flags & NFS4_DEVICE_ID_NEG_ENTRY) {
+                        /* Already tried to connect, don't try again */
+                        dprintk("%s Deviceid marked out of use\n", __func__);
+                        return NULL;
+                }
+                err = nfs4_ds_connect(s, ds);
                 if (err) {
-                        printk(KERN_ERR "%s nfs4_ds_connect error %d\n",
-                               __func__, err);
+                        filelayout_mark_devid_negative(dsaddr, err,
+                                                       ntohl(ds->ds_ip_addr));
                         return NULL;
                 }
         }