NFSv4.1 Server Implementation

Server support for minorversion 1 can be controlled using the
/proc/fs/nfsd/versions control file.  The string output returned
by reading this file will contain either "+4.1" or "-4.1"
correspondingly.

Currently, server support for minorversion 1 is disabled by default.
It can be enabled at run time by writing the string "+4.1" to
the /proc/fs/nfsd/versions control file.  Note that to write this
control file, the nfsd service must be taken down.  Use your user-mode
nfs-utils to set this up; see rpc.nfsd(8)

(Warning: older servers will interpret "+4.1" and "-4.1" as "+4" and
"-4", respectively.  Therefore, code meant to work on both new and old
kernels must turn 4.1 on or off *before* turning support for version 4
on or off; rpc.nfsd does this correctly.)

The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
on RFC 5661.

From the many new features in NFSv4.1 the current implementation
focuses on the mandatory-to-implement NFSv4.1 Sessions, providing
"exactly once" semantics and better control and throttling of the
resources allocated for each client.

Other NFSv4.1 features, Parallel NFS operations in particular,
are still under development out of tree.
See http://wiki.linux-nfs.org/wiki/index.php/PNFS_prototype_design
for more information.

The current implementation is intended for developers only: while it
does support ordinary file operations on clients we have tested against
(including the linux client), it is incomplete in ways which may limit
features unexpectedly, cause known bugs in rare cases, or cause
interoperability problems with future clients.  Known issues:

	- gss support is questionable: currently mounts with kerberos
	  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).
	- 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.

In addition, some limitations are inherited from the current NFSv4
implementation:

	- Incomplete delegation enforcement: if a file is renamed or
	  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
(OPT), and NFSv4.0 operations that are required not to implement (MNI)
in minor version 1.  The first column indicates the operations that
are not supported yet by the linux server implementation.

The OPTIONAL features identified and their abbreviations are as follows:
	pNFS	Parallel NFS
	FDELG	File Delegations
	DDELG	Directory Delegations

The following abbreviations indicate the linux server implementation status.
	I	Implemented NFSv4.1 operations.
	NS	Not Supported.
	NS*	unimplemented optional feature.
	P	pNFS features implemented out of tree.
	PNS	pNFS features that are not supported yet (out of tree).

Operations

   +----------------------+------------+--------------+----------------+
   | Operation            | REQ, REC,  | Feature      | Definition     |
   |                      | OPT, or    | (REQ, REC,   |                |
   |                      | MNI        | or OPT)      |                |
   +----------------------+------------+--------------+----------------+
   | ACCESS               | REQ        |              | Section 18.1   |
I  | BACKCHANNEL_CTL      | REQ        |              | Section 18.33  |
I  | BIND_CONN_TO_SESSION | REQ        |              | Section 18.34  |
   | CLOSE                | REQ        |              | Section 18.2   |
   | COMMIT               | REQ        |              | Section 18.3   |
   | CREATE               | REQ        |              | Section 18.4   |
I  | CREATE_SESSION       | REQ        |              | Section 18.36  |
NS*| DELEGPURGE           | OPT        | FDELG (REQ)  | Section 18.5   |
   | DELEGRETURN          | OPT        | FDELG,       | Section 18.6   |
   |                      |            | DDELG, pNFS  |                |
   |                      |            | (REQ)        |                |
I  | DESTROY_CLIENTID     | REQ        |              | Section 18.50  |
I  | DESTROY_SESSION      | REQ        |              | Section 18.37  |
I  | EXCHANGE_ID          | REQ        |              | Section 18.35  |
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  |
   | GETFH                | REQ        |              | Section 18.8   |
NS*| GET_DIR_DELEGATION   | OPT        | DDELG (REQ)  | Section 18.39  |
P  | LAYOUTCOMMIT         | OPT        | pNFS (REQ)   | Section 18.42  |
P  | LAYOUTGET            | OPT        | pNFS (REQ)   | Section 18.43  |
P  | LAYOUTRETURN         | OPT        | pNFS (REQ)   | Section 18.44  |
   | LINK                 | OPT        |              | Section 18.9   |
   | LOCK                 | REQ        |              | Section 18.10  |
   | LOCKT                | REQ        |              | Section 18.11  |
   | LOCKU                | REQ        |              | Section 18.12  |
   | LOOKUP               | REQ        |              | Section 18.13  |
   | LOOKUPP              | REQ        |              | Section 18.14  |
   | NVERIFY              | REQ        |              | Section 18.15  |
   | OPEN                 | REQ        |              | Section 18.16  |
NS*| OPENATTR             | OPT        |              | Section 18.17  |
   | OPEN_CONFIRM         | MNI        |              | N/A            |
   | OPEN_DOWNGRADE       | REQ        |              | Section 18.18  |
   | PUTFH                | REQ        |              | Section 18.19  |
   | PUTPUBFH             | REQ        |              | Section 18.20  |
   | PUTROOTFH            | REQ        |              | Section 18.21  |
   | READ                 | REQ        |              | Section 18.22  |
   | READDIR              | REQ        |              | Section 18.23  |
   | READLINK             | OPT        |              | Section 18.24  |
   | RECLAIM_COMPLETE     | REQ        |              | Section 18.51  |
   | RELEASE_LOCKOWNER    | MNI        |              | N/A            |
   | REMOVE               | REQ        |              | Section 18.25  |
   | RENAME               | REQ        |              | Section 18.26  |
   | RENEW                | MNI        |              | N/A            |
   | RESTOREFH            | REQ        |              | Section 18.27  |
   | SAVEFH               | REQ        |              | Section 18.28  |
   | SECINFO              | REQ        |              | Section 18.29  |
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  |
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  |

Callback Operations

   +-------------------------+-----------+-------------+---------------+
   | Operation               | REQ, REC, | Feature     | Definition    |
   |                         | OPT, or   | (REQ, REC,  |               |
   |                         | MNI       | or OPT)     |               |
   +-------------------------+-----------+-------------+---------------+
   | CB_GETATTR              | OPT       | FDELG (REQ) | Section 20.1  |
P  | CB_LAYOUTRECALL         | OPT       | pNFS (REQ)  | Section 20.3  |
NS*| CB_NOTIFY               | OPT       | DDELG (REQ) | Section 20.4  |
P  | CB_NOTIFY_DEVICEID      | OPT       | pNFS (OPT)  | Section 20.12 |
NS*| CB_NOTIFY_LOCK          | OPT       |             | Section 20.11 |
NS*| CB_PUSH_DELEG           | OPT       | FDELG (OPT) | Section 20.5  |
   | CB_RECALL               | OPT       | FDELG,      | Section 20.2  |
   |                         |           | DDELG, pNFS |               |
   |                         |           | (REQ)       |               |
NS*| CB_RECALL_ANY           | OPT       | FDELG,      | Section 20.6  |
   |                         |           | DDELG, pNFS |               |
   |                         |           | (REQ)       |               |
NS | CB_RECALL_SLOT          | REQ       |             | Section 20.8  |
NS*| CB_RECALLABLE_OBJ_AVAIL | OPT       | DDELG, pNFS | Section 20.7  |
   |                         |           | (REQ)       |               |
I  | CB_SEQUENCE             | OPT       | FDELG,      | Section 20.9  |
   |                         |           | DDELG, pNFS |               |
   |                         |           | (REQ)       |               |
NS*| CB_WANTS_CANCELLED      | OPT       | FDELG,      | Section 20.10 |
   |                         |           | DDELG, pNFS |               |
   |                         |           | (REQ)       |               |
   +-------------------------+-----------+-------------+---------------+

Implementation notes:

DELEGPURGE:
* mandatory only for servers that support CLAIM_DELEGATE_PREV and/or
  CLAIM_DELEG_PREV_FH (which allows clients to keep delegations that
  persist across client reboots).  Thus we need not implement this for
  now.

EXCHANGE_ID:
* only SP4_NONE state protection supported
* implementation ids are ignored

CREATE_SESSION:
* backchannel attributes are ignored

SEQUENCE:
* no support for dynamic slot table renegotiation (optional)

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
  fail to live up to the promise we made in CREATE_SESSION fore channel
  negotiation.
* No more than one read-like operation allowed per compound; encoding
  replies that cross page boundaries (except for read data) not handled.

See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.