doc: cmount_path documentation for CEPHFS nfs exports

Signed-off-by: Avan Thakkar <athakkar@redhat.com>

diff --git a/doc/mgr/nfs.rst b/doc/mgr/nfs.rst
index 746ab4247f39f06e46ec08a6b57522fb449ac1d1..a43323000396be0a931934e4e4d0862c796970f7 100644 (file)
--- a/doc/mgr/nfs.rst
+++ b/doc/mgr/nfs.rst
@@ -283,7 +283,7 @@ Create CephFS Export
 
 .. code:: bash
 
-    $ ceph nfs export create cephfs --cluster-id <cluster_id> --pseudo-path <pseudo_path> --fsname <fsname> [--readonly] [--path=/path/in/cephfs] [--client_addr <value>...] [--squash <value>] [--sectype <value>...]
+    $ ceph nfs export create cephfs --cluster-id <cluster_id> --pseudo-path <pseudo_path> --fsname <fsname> [--readonly] [--path=/path/in/cephfs] [--client_addr <value>...] [--squash <value>] [--sectype <value>...] [--cmount_path <value>]
 
 This creates export RADOS objects containing the export block, where
 
@@ -318,6 +318,11 @@ values may be separated by a comma (example: ``--sectype krb5p,krb5i``). The
 server will negotatiate a supported security type with the client preferring
 the supplied methods left-to-right.
 
+``<cmount_path>`` specifies the path within the ceph filesystem to mount this export on. It is
+allowed to be any complete path hierarchy between ``/`` and the ``EXPORT {path}``. (i.e. if ``EXPORT { Path }`` parameter is ``/foo/bar`` then cmount_path could be ``/``, ``/foo`` or ``/foo/bar``).
+!! If this and the other ``EXPORT { FSAL {} }`` options are the same between multiple exports, those exports will share a single cephfs client.
+If not specified, the default is ``/``.
+
 .. note:: Specifying values for sectype that require Kerberos will only function on servers
           that are configured to support Kerberos. Setting up NFS-Ganesha to support Kerberos
           is outside the scope of this document.
@@ -477,9 +482,9 @@ For example,::
      ],
      "fsal": {
        "name": "CEPH",
-       "user_id": "nfs.mynfs.1",
        "fs_name": "a",
-       "sec_label_xattr": ""
+       "sec_label_xattr": "",
+       "cmount_path": "/"
      },
      "clients": []
    }
@@ -493,6 +498,8 @@ provided JSON should fully describe the new state of the export (just
 as when creating a new export), with the exception of the
 authentication credentials, which will be carried over from the
 previous state of the export where possible.
+The ``user_id`` in the ``fsal`` block should not be modified or mentioned in the JSON file as it is auto-generated for CephFS exports.
+It's auto-generated in the format ``nfs.<cluster_id>.<fs_name>.<hash_id>``.
 
 ::
 
@@ -514,9 +521,9 @@ previous state of the export where possible.
      ],
      "fsal": {
        "name": "CEPH",
-       "user_id": "nfs.mynfs.1",
        "fs_name": "a",
-       "sec_label_xattr": ""
+       "sec_label_xattr": "",
+       "cmount_path": "/"
      },
      "clients": []
    }