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   1 NFSv4.1 Server Implementation
   2
   3 Server support for minorversion 1 can be controlled using the
   4 /proc/fs/nfsd/versions control file.  The string output returned
   5 by reading this file will contain either "+4.1" or "-4.1"
   6 correspondingly.
   7
   8 Currently, server support for minorversion 1 is disabled by default.
   9 It can be enabled at run time by writing the string "+4.1" to
  10 the /proc/fs/nfsd/versions control file.  Note that to write this
  11 control file, the nfsd service must be taken down.  Use your user-mode
  12 nfs-utils to set this up; see rpc.nfsd(8)
  13
  14 The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
  15 on the latest NFSv4.1 Internet Draft:
  16 http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-29
  17
  18 From the many new features in NFSv4.1 the current implementation
  19 focuses on the mandatory-to-implement NFSv4.1 Sessions, providing
  20 "exactly once" semantics and better control and throttling of the
  21 resources allocated for each client.
  22
  23 Other NFSv4.1 features, Parallel NFS operations in particular,
  24 are still under development out of tree.
  25 See http://wiki.linux-nfs.org/wiki/index.php/PNFS_prototype_design
  26 for more information.
  27
  28 The table below, taken from the NFSv4.1 document, lists
  29 the operations that are mandatory to implement (REQ), optional
  30 (OPT), and NFSv4.0 operations that are required not to implement (MNI)
  31 in minor version 1.  The first column indicates the operations that
  32 are not supported yet by the linux server implementation.
  33
  34 The OPTIONAL features identified and their abbreviations are as follows:
  35         pNFS    Parallel NFS
  36         FDELG   File Delegations
  37         DDELG   Directory Delegations
  38
  39 The following abbreviations indicate the linux server implementation status.
  40         I       Implemented NFSv4.1 operations.
  41         NS      Not Supported.
  42         NS*     unimplemented optional feature.
  43         P       pNFS features implemented out of tree.
  44         PNS     pNFS features that are not supported yet (out of tree).
  45
  46 Operations
  47
  48    +----------------------+------------+--------------+----------------+
  49    | Operation            | REQ, REC,  | Feature      | Definition     |
  50    |                      | OPT, or    | (REQ, REC,   |                |
  51    |                      | MNI        | or OPT)      |                |
  52    +----------------------+------------+--------------+----------------+
  53    | ACCESS               | REQ        |              | Section 18.1   |
  54 NS | BACKCHANNEL_CTL      | REQ        |              | Section 18.33  |
  55 NS | BIND_CONN_TO_SESSION | REQ        |              | Section 18.34  |
  56    | CLOSE                | REQ        |              | Section 18.2   |
  57    | COMMIT               | REQ        |              | Section 18.3   |
  58    | CREATE               | REQ        |              | Section 18.4   |
  59 I  | CREATE_SESSION       | REQ        |              | Section 18.36  |
  60 NS*| DELEGPURGE           | OPT        | FDELG (REQ)  | Section 18.5   |
  61    | DELEGRETURN          | OPT        | FDELG,       | Section 18.6   |
  62    |                      |            | DDELG, pNFS  |                |
  63    |                      |            | (REQ)        |                |
  64 NS | DESTROY_CLIENTID     | REQ        |              | Section 18.50  |
  65 I  | DESTROY_SESSION      | REQ        |              | Section 18.37  |
  66 I  | EXCHANGE_ID          | REQ        |              | Section 18.35  |
  67 NS | FREE_STATEID         | REQ        |              | Section 18.38  |
  68    | GETATTR              | REQ        |              | Section 18.7   |
  69 P  | GETDEVICEINFO        | OPT        | pNFS (REQ)   | Section 18.40  |
  70 P  | GETDEVICELIST        | OPT        | pNFS (OPT)   | Section 18.41  |
  71    | GETFH                | REQ        |              | Section 18.8   |
  72 NS*| GET_DIR_DELEGATION   | OPT        | DDELG (REQ)  | Section 18.39  |
  73 P  | LAYOUTCOMMIT         | OPT        | pNFS (REQ)   | Section 18.42  |
  74 P  | LAYOUTGET            | OPT        | pNFS (REQ)   | Section 18.43  |
  75 P  | LAYOUTRETURN         | OPT        | pNFS (REQ)   | Section 18.44  |
  76    | LINK                 | OPT        |              | Section 18.9   |
  77    | LOCK                 | REQ        |              | Section 18.10  |
  78    | LOCKT                | REQ        |              | Section 18.11  |
  79    | LOCKU                | REQ        |              | Section 18.12  |
  80    | LOOKUP               | REQ        |              | Section 18.13  |
  81    | LOOKUPP              | REQ        |              | Section 18.14  |
  82    | NVERIFY              | REQ        |              | Section 18.15  |
  83    | OPEN                 | REQ        |              | Section 18.16  |
  84 NS*| OPENATTR             | OPT        |              | Section 18.17  |
  85    | OPEN_CONFIRM         | MNI        |              | N/A            |
  86    | OPEN_DOWNGRADE       | REQ        |              | Section 18.18  |
  87    | PUTFH                | REQ        |              | Section 18.19  |
  88    | PUTPUBFH             | REQ        |              | Section 18.20  |
  89    | PUTROOTFH            | REQ        |              | Section 18.21  |
  90    | READ                 | REQ        |              | Section 18.22  |
  91    | READDIR              | REQ        |              | Section 18.23  |
  92    | READLINK             | OPT        |              | Section 18.24  |
  93 NS | RECLAIM_COMPLETE     | REQ        |              | Section 18.51  |
  94    | RELEASE_LOCKOWNER    | MNI        |              | N/A            |
  95    | REMOVE               | REQ        |              | Section 18.25  |
  96    | RENAME               | REQ        |              | Section 18.26  |
  97    | RENEW                | MNI        |              | N/A            |
  98    | RESTOREFH            | REQ        |              | Section 18.27  |
  99    | SAVEFH               | REQ        |              | Section 18.28  |
 100    | SECINFO              | REQ        |              | Section 18.29  |
 101 NS | SECINFO_NO_NAME      | REC        | pNFS files   | Section 18.45, |
 102    |                      |            | layout (REQ) | Section 13.12  |
 103 I  | SEQUENCE             | REQ        |              | Section 18.46  |
 104    | SETATTR              | REQ        |              | Section 18.30  |
 105    | SETCLIENTID          | MNI        |              | N/A            |
 106    | SETCLIENTID_CONFIRM  | MNI        |              | N/A            |
 107 NS | SET_SSV              | REQ        |              | Section 18.47  |
 108 NS | TEST_STATEID         | REQ        |              | Section 18.48  |
 109    | VERIFY               | REQ        |              | Section 18.31  |
 110 NS*| WANT_DELEGATION      | OPT        | FDELG (OPT)  | Section 18.49  |
 111    | WRITE                | REQ        |              | Section 18.32  |
 112
 113 Callback Operations
 114
 115    +-------------------------+-----------+-------------+---------------+
 116    | Operation               | REQ, REC, | Feature     | Definition    |
 117    |                         | OPT, or   | (REQ, REC,  |               |
 118    |                         | MNI       | or OPT)     |               |
 119    +-------------------------+-----------+-------------+---------------+
 120    | CB_GETATTR              | OPT       | FDELG (REQ) | Section 20.1  |
 121 P  | CB_LAYOUTRECALL         | OPT       | pNFS (REQ)  | Section 20.3  |
 122 NS*| CB_NOTIFY               | OPT       | DDELG (REQ) | Section 20.4  |
 123 P  | CB_NOTIFY_DEVICEID      | OPT       | pNFS (OPT)  | Section 20.12 |
 124 NS*| CB_NOTIFY_LOCK          | OPT       |             | Section 20.11 |
 125 NS*| CB_PUSH_DELEG           | OPT       | FDELG (OPT) | Section 20.5  |
 126    | CB_RECALL               | OPT       | FDELG,      | Section 20.2  |
 127    |                         |           | DDELG, pNFS |               |
 128    |                         |           | (REQ)       |               |
 129 NS*| CB_RECALL_ANY           | OPT       | FDELG,      | Section 20.6  |
 130    |                         |           | DDELG, pNFS |               |
 131    |                         |           | (REQ)       |               |
 132 NS | CB_RECALL_SLOT          | REQ       |             | Section 20.8  |
 133 NS*| CB_RECALLABLE_OBJ_AVAIL | OPT       | DDELG, pNFS | Section 20.7  |
 134    |                         |           | (REQ)       |               |
 135 I  | CB_SEQUENCE             | OPT       | FDELG,      | Section 20.9  |
 136    |                         |           | DDELG, pNFS |               |
 137    |                         |           | (REQ)       |               |
 138 NS*| CB_WANTS_CANCELLED      | OPT       | FDELG,      | Section 20.10 |
 139    |                         |           | DDELG, pNFS |               |
 140    |                         |           | (REQ)       |               |
 141    +-------------------------+-----------+-------------+---------------+
 142
 143 Implementation notes:
 144
 145 EXCHANGE_ID:
 146 * only SP4_NONE state protection supported
 147 * implementation ids are ignored
 148
 149 CREATE_SESSION:
 150 * backchannel attributes are ignored
 151 * backchannel security parameters are ignored
 152
 153 SEQUENCE:
 154 * no support for dynamic slot table renegotiation (optional)
 155
 156 nfsv4.1 COMPOUND rules:
 157 The following cases aren't supported yet:
 158 * Enforcing of NFS4ERR_NOT_ONLY_OP for: BIND_CONN_TO_SESSION, CREATE_SESSION,
 159   DESTROY_CLIENTID, DESTROY_SESSION, EXCHANGE_ID.
 160 * DESTROY_SESSION MUST be the final operation in the COMPOUND request.
 161