nfs: flexfilelayout: remove v3-only data server limitation

Flexfilelayout supports data servers which talk NFS v3 and v4.{0,1,2}.
However, this code path is disabled and v3 only servers are accepted.
This change removes this limitation.
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index 457cfeb1d5c1..8ca9cc665561 100644
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -119,7 +119,13 @@ nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
                 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
                         ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
 
-                if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
+                /*
+                 * check for valid major/minor combination.
+                 * currently we support dataserver which talk:
+                 *   v3, v4.0, v4.1, v4.2
+                 */
+                if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
+                        (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
                         dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
                                 i, ds_versions[i].version,
                                 ds_versions[i].minor_version);