mount.nfs: Retry v4 mounts with v3 on ENOENT errors

[nfs-utils.git] / utils / mount / stropts.c

diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index b5956495eeebf164638d9613102faf81e503a4a5..4007150103867590bee8c858b549d8a4a20ebd29 100644 (file)
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -611,6 +611,18 @@ static int nfs_try_mount_v4(struct nfsmount_info *mi)
        }
 
        if (mi->version == 0) {
+               if (po_contains(options, "mounthost") ||
+                       po_contains(options, "mountaddr") ||
+                       po_contains(options, "mountvers") ||
+                       po_contains(options, "mountproto")) {
+               /*
+                * Since these mountd options are set assume version 3
+                * is wanted so error out with EPROTONOSUPPORT so the
+                * protocol negation starts with v3.
+                */
+                       errno = EPROTONOSUPPORT;
+                       goto out_fail;
+               }
                if (po_append(options, "vers=4") == PO_FAILED) {
                        errno = EINVAL;
                        goto out_fail;
@@ -656,9 +668,10 @@ static int nfs_try_mount(struct nfsmount_info *mi)
                                /* 
                                 * To deal with legacy Linux servers that don't
                                 * automatically export a pseudo root, retry
-                                * ENOENT errors using version 3
+                                * ENOENT errors using version 3. And for
+                                * Linux servers prior to 2.6.25, retry EPERM
                                 */
-                               if (errno != ENOENT)
+                               if (errno != ENOENT && errno != EPERM)
                                        break;
                        }
                }