pNFS/flexfiles: never nfs4_mark_deviceid_unavailable

The flexfiles layout should never mark a device unavailable.

Move nfs4_mark_deviceid_unavailable out of nfs4_pnfs_ds_connect and call
directly from files layout where it's still needed.

The flexfiles driver still handles marked devices in error paths, but will
now print a rate limited warning.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/filelayout/filelayoutdev.c b/fs/nfs/filelayout/filelayoutdev.c
index 1881206..d913e81 100644 (file)
--- a/fs/nfs/filelayout/filelayoutdev.c
+++ b/fs/nfs/filelayout/filelayoutdev.c
@@ -282,6 +282,7 @@ nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
                             dataserver_retrans, 4,
                             s->nfs_client->cl_minorversion);
        if (status) {
+               nfs4_mark_deviceid_unavailable(devid);
                ret = NULL;
                goto out;
        }

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
index f4f39b0..98b34c9 100644 (file)
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -175,7 +175,19 @@ ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg)
 static inline bool
 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
 {
-       return nfs4_test_deviceid_unavailable(node);
+       /*
+        * Flexfiles should never mark a DS unavailable, but if it does
+        * print a (ratelimited) warning as this can affect performance.
+        */
+       if (nfs4_test_deviceid_unavailable(node)) {
+               u32 *p = (u32 *)node->deviceid.data;
+
+               pr_warn_ratelimited("NFS: flexfiles layout referencing an "
+                               "unavailable device [%x%x%x%x]\n",
+                               p[0], p[1], p[2], p[3]);
+               return true;
+       }
+       return false;
 }
 
 static inline int

diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index 544e772..85fde93 100644 (file)
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -421,11 +421,11 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
                        mirror->mirror_ds->ds_versions[0].wsize = max_payload;
                goto out;
        }
+out_fail:
        ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
                                 mirror, lseg->pls_range.offset,
                                 lseg->pls_range.length, NFS4ERR_NXIO,
                                 OP_ILLEGAL, GFP_NOIO);
-out_fail:
        if (fail_return || !ff_layout_has_available_ds(lseg))
                pnfs_error_mark_layout_for_return(ino, lseg);
        ds = NULL;

diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index a7691b9..7250b95 100644 (file)
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -751,9 +751,11 @@ int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
                          struct nfs4_deviceid_node *devid, unsigned int timeo,
                          unsigned int retrans, u32 version, u32 minor_version)
 {
-       if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
-               int err = 0;
+       int err;
 
+again:
+       err = 0;
+       if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
                if (version == 3) {
                        err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
                                                       retrans);
@@ -766,23 +768,29 @@ int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
                        err = -EPROTONOSUPPORT;
                }
 
-               if (err)
-                       nfs4_mark_deviceid_unavailable(devid);
                nfs4_clear_ds_conn_bit(ds);
        } else {
                nfs4_wait_ds_connect(ds);
+
+               /* what was waited on didn't connect AND didn't mark unavail */
+               if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid))
+                       goto again;
        }
 
        /*
         * At this point the ds->ds_clp should be ready, but it might have
         * hit an error.
         */
-       if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
-               WARN_ON_ONCE(1);
-               return -EINVAL;
+       if (!err) {
+               if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
+                       WARN_ON_ONCE(ds->ds_clp ||
+                               !nfs4_test_deviceid_unavailable(devid));
+                       return -EINVAL;
+               }
+               err = nfs_client_init_status(ds->ds_clp);
        }
 
-       return nfs_client_init_status(ds->ds_clp);
+       return err;
 }
 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);