nfsd4: update nfsv4.1 implementation notes

Update documentation to reflect recent progress.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/Documentation/filesystems/nfs/nfs41-server.txt b/Documentation/filesystems/nfs/nfs41-server.txt
index 0488491..092fad9 100644 (file)
--- a/Documentation/filesystems/nfs/nfs41-server.txt
+++ b/Documentation/filesystems/nfs/nfs41-server.txt
@@ -39,27 +39,17 @@ interoperability problems with future clients.  Known issues:
          from a linux client are possible, but we aren't really
          conformant with the spec (for example, we don't use kerberos
          on the backchannel correctly).
-       - no trunking support: no clients currently take advantage of
-         trunking, but this is a mandatory feature, and its use is
-         recommended to clients in a number of places.  (E.g. to ensure
-         timely renewal in case an existing connection's retry timeouts
-         have gotten too long; see section 8.3 of the RFC.)
-         Therefore, lack of this feature may cause future clients to
-         fail.
        - Incomplete backchannel support: incomplete backchannel gss
          support and no support for BACKCHANNEL_CTL mean that
          callbacks (hence delegations and layouts) may not be
          available and clients confused by the incomplete
          implementation may fail.
-       - Server reboot recovery is unsupported; if the server reboots,
-         clients may fail.
        - We do not support SSV, which provides security for shared
          client-server state (thus preventing unauthorized tampering
          with locks and opens, for example).  It is mandatory for
          servers to support this, though no clients use it yet.
        - Mandatory operations which we do not support, such as
-         DESTROY_CLIENTID, FREE_STATEID, SECINFO_NO_NAME, and
-         TEST_STATEID, are not currently used by clients, but will be
+         DESTROY_CLIENTID, are not currently used by clients, but will be
          (and the spec recommends their uses in common cases), and
          clients should not be expected to know how to recover from the
          case where they are not supported.  This will eventually cause
@@ -69,8 +59,9 @@ In addition, some limitations are inherited from the current NFSv4
 implementation:
 
        - Incomplete delegation enforcement: if a file is renamed or
-         unlinked, a client holding a delegation may continue to
-         indefinitely allow opens of the file under the old name.
+         unlinked by a local process, a client holding a delegation may
+         continue to indefinitely allow opens of the file under the old
+         name.
 
 The table below, taken from the NFSv4.1 document, lists
 the operations that are mandatory to implement (REQ), optional
@@ -99,7 +90,7 @@ Operations
    +----------------------+------------+--------------+----------------+
    | ACCESS               | REQ        |              | Section 18.1   |
 NS | BACKCHANNEL_CTL      | REQ        |              | Section 18.33  |
-NS | BIND_CONN_TO_SESSION | REQ        |              | Section 18.34  |
+I  | BIND_CONN_TO_SESSION | REQ        |              | Section 18.34  |
    | CLOSE                | REQ        |              | Section 18.2   |
    | COMMIT               | REQ        |              | Section 18.3   |
    | CREATE               | REQ        |              | Section 18.4   |
@@ -111,7 +102,7 @@ NS*| DELEGPURGE           | OPT        | FDELG (REQ)  | Section 18.5   |
 NS | DESTROY_CLIENTID     | REQ        |              | Section 18.50  |
 I  | DESTROY_SESSION      | REQ        |              | Section 18.37  |
 I  | EXCHANGE_ID          | REQ        |              | Section 18.35  |
-NS | FREE_STATEID         | REQ        |              | Section 18.38  |
+I  | FREE_STATEID         | REQ        |              | Section 18.38  |
    | GETATTR              | REQ        |              | Section 18.7   |
 P  | GETDEVICEINFO        | OPT        | pNFS (REQ)   | Section 18.40  |
 P  | GETDEVICELIST        | OPT        | pNFS (OPT)   | Section 18.41  |
@@ -145,14 +136,14 @@ NS*| OPENATTR             | OPT        |              | Section 18.17  |
    | RESTOREFH            | REQ        |              | Section 18.27  |
    | SAVEFH               | REQ        |              | Section 18.28  |
    | SECINFO              | REQ        |              | Section 18.29  |
-NS | SECINFO_NO_NAME      | REC        | pNFS files   | Section 18.45, |
+I  | SECINFO_NO_NAME      | REC        | pNFS files   | Section 18.45, |
    |                      |            | layout (REQ) | Section 13.12  |
 I  | SEQUENCE             | REQ        |              | Section 18.46  |
    | SETATTR              | REQ        |              | Section 18.30  |
    | SETCLIENTID          | MNI        |              | N/A            |
    | SETCLIENTID_CONFIRM  | MNI        |              | N/A            |
 NS | SET_SSV              | REQ        |              | Section 18.47  |
-NS | TEST_STATEID         | REQ        |              | Section 18.48  |
+I  | TEST_STATEID         | REQ        |              | Section 18.48  |
    | VERIFY               | REQ        |              | Section 18.31  |
 NS*| WANT_DELEGATION      | OPT        | FDELG (OPT)  | Section 18.49  |
    | WRITE                | REQ        |              | Section 18.32  |
@@ -206,12 +197,6 @@ CREATE_SESSION:
 SEQUENCE:
 * no support for dynamic slot table renegotiation (optional)
 
-nfsv4.1 COMPOUND rules:
-The following cases aren't supported yet:
-* Enforcing of NFS4ERR_NOT_ONLY_OP for: BIND_CONN_TO_SESSION, CREATE_SESSION,
-  DESTROY_CLIENTID, DESTROY_SESSION, EXCHANGE_ID.
-* DESTROY_SESSION MUST be the final operation in the COMPOUND request.
-
 Nonstandard compound limitations:
 * No support for a sessions fore channel RPC compound that requires both a
   ca_maxrequestsize request and a ca_maxresponsesize reply, so we may
@@ -219,3 +204,5 @@ Nonstandard compound limitations:
   negotiation.
 * No more than one IO operation (read, write, readdir) allowed per
   compound.
+
+See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.