| Benny Halevy | 3ef1728 | 2009-04-03 08:29:20 +0300 | [diff] [blame] | 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 | |