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Documentation: nfs: nfs41-server: convert to ReST

Convert nfs41-server.txt to ReST. ASCII tables were converted to ReST grid
table format.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Link: https://lore.kernel.org/r/20200129044917.566906-5-dwlsalmeida@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

authored by

Daniel W. S. Almeida and committed by
Jonathan Corbet
04f81fb0 250baf06

+257 -173
+1
Documentation/filesystems/nfs/index.rst
··· 9 9 pnfs 10 10 rpc-cache 11 11 rpc-server-gss 12 + nfs41-server
+256
Documentation/filesystems/nfs/nfs41-server.rst
··· 1 + ============================= 2 + NFSv4.1 Server Implementation 3 + ============================= 4 + 5 + Server support for minorversion 1 can be controlled using the 6 + /proc/fs/nfsd/versions control file. The string output returned 7 + by reading this file will contain either "+4.1" or "-4.1" 8 + correspondingly. 9 + 10 + Currently, server support for minorversion 1 is enabled by default. 11 + It can be disabled at run time by writing the string "-4.1" to 12 + the /proc/fs/nfsd/versions control file. Note that to write this 13 + control file, the nfsd service must be taken down. You can use rpc.nfsd 14 + for this; see rpc.nfsd(8). 15 + 16 + (Warning: older servers will interpret "+4.1" and "-4.1" as "+4" and 17 + "-4", respectively. Therefore, code meant to work on both new and old 18 + kernels must turn 4.1 on or off *before* turning support for version 4 19 + on or off; rpc.nfsd does this correctly.) 20 + 21 + The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based 22 + on RFC 5661. 23 + 24 + From the many new features in NFSv4.1 the current implementation 25 + focuses on the mandatory-to-implement NFSv4.1 Sessions, providing 26 + "exactly once" semantics and better control and throttling of the 27 + resources allocated for each client. 28 + 29 + The table below, taken from the NFSv4.1 document, lists 30 + the operations that are mandatory to implement (REQ), optional 31 + (OPT), and NFSv4.0 operations that are required not to implement (MNI) 32 + in minor version 1. The first column indicates the operations that 33 + are not supported yet by the linux server implementation. 34 + 35 + The OPTIONAL features identified and their abbreviations are as follows: 36 + 37 + - **pNFS** Parallel NFS 38 + - **FDELG** File Delegations 39 + - **DDELG** Directory Delegations 40 + 41 + The following abbreviations indicate the linux server implementation status. 42 + 43 + - **I** Implemented NFSv4.1 operations. 44 + - **NS** Not Supported. 45 + - **NS\*** Unimplemented optional feature. 46 + 47 + Operations 48 + ========== 49 + 50 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 51 + | Implementation status | Operation | REQ,REC, OPT or NMI | Feature (REQ, REC or OPT) | Definition | 52 + +=======================+======================+=====================+===========================+================+ 53 + | | ACCESS | REQ | | Section 18.1 | 54 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 55 + | I | BACKCHANNEL_CTL | REQ | | Section 18.33 | 56 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 57 + | I | BIND_CONN_TO_SESSION | REQ | | Section 18.34 | 58 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 59 + | | CLOSE | REQ | | Section 18.2 | 60 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 61 + | | COMMIT | REQ | | Section 18.3 | 62 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 63 + | | CREATE | REQ | | Section 18.4 | 64 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 65 + | I | CREATE_SESSION | REQ | | Section 18.36 | 66 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 67 + | NS* | DELEGPURGE | OPT | FDELG (REQ) | Section 18.5 | 68 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 69 + | | DELEGRETURN | OPT | FDELG, | Section 18.6 | 70 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 71 + | | | | DDELG, pNFS | | 72 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 73 + | | | | (REQ) | | 74 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 75 + | I | DESTROY_CLIENTID | REQ | | Section 18.50 | 76 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 77 + | I | DESTROY_SESSION | REQ | | Section 18.37 | 78 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 79 + | I | EXCHANGE_ID | REQ | | Section 18.35 | 80 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 81 + | I | FREE_STATEID | REQ | | Section 18.38 | 82 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 83 + | | GETATTR | REQ | | Section 18.7 | 84 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 85 + | I | GETDEVICEINFO | OPT | pNFS (REQ) | Section 18.40 | 86 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 87 + | NS* | GETDEVICELIST | OPT | pNFS (OPT) | Section 18.41 | 88 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 89 + | | GETFH | REQ | | Section 18.8 | 90 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 91 + | NS* | GET_DIR_DELEGATION | OPT | DDELG (REQ) | Section 18.39 | 92 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 93 + | I | LAYOUTCOMMIT | OPT | pNFS (REQ) | Section 18.42 | 94 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 95 + | I | LAYOUTGET | OPT | pNFS (REQ) | Section 18.43 | 96 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 97 + | I | LAYOUTRETURN | OPT | pNFS (REQ) | Section 18.44 | 98 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 99 + | | LINK | OPT | | Section 18.9 | 100 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 101 + | | LOCK | REQ | | Section 18.10 | 102 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 103 + | | LOCKT | REQ | | Section 18.11 | 104 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 105 + | | LOCKU | REQ | | Section 18.12 | 106 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 107 + | | LOOKUP | REQ | | Section 18.13 | 108 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 109 + | | LOOKUPP | REQ | | Section 18.14 | 110 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 111 + | | NVERIFY | REQ | | Section 18.15 | 112 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 113 + | | OPEN | REQ | | Section 18.16 | 114 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 115 + | NS* | OPENATTR | OPT | | Section 18.17 | 116 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 117 + | | OPEN_CONFIRM | MNI | | N/A | 118 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 119 + | | OPEN_DOWNGRADE | REQ | | Section 18.18 | 120 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 121 + | | PUTFH | REQ | | Section 18.19 | 122 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 123 + | | PUTPUBFH | REQ | | Section 18.20 | 124 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 125 + | | PUTROOTFH | REQ | | Section 18.21 | 126 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 127 + | | READ | REQ | | Section 18.22 | 128 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 129 + | | READDIR | REQ | | Section 18.23 | 130 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 131 + | | READLINK | OPT | | Section 18.24 | 132 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 133 + | | RECLAIM_COMPLETE | REQ | | Section 18.51 | 134 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 135 + | | RELEASE_LOCKOWNER | MNI | | N/A | 136 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 137 + | | REMOVE | REQ | | Section 18.25 | 138 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 139 + | | RENAME | REQ | | Section 18.26 | 140 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 141 + | | RENEW | MNI | | N/A | 142 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 143 + | | RESTOREFH | REQ | | Section 18.27 | 144 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 145 + | | SAVEFH | REQ | | Section 18.28 | 146 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 147 + | | SECINFO | REQ | | Section 18.29 | 148 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 149 + | I | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, | 150 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 151 + | | | | layout (REQ) | Section 13.12 | 152 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 153 + | I | SEQUENCE | REQ | | Section 18.46 | 154 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 155 + | | SETATTR | REQ | | Section 18.30 | 156 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 157 + | | SETCLIENTID | MNI | | N/A | 158 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 159 + | | SETCLIENTID_CONFIRM | MNI | | N/A | 160 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 161 + | NS | SET_SSV | REQ | | Section 18.47 | 162 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 163 + | I | TEST_STATEID | REQ | | Section 18.48 | 164 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 165 + | | VERIFY | REQ | | Section 18.31 | 166 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 167 + | NS* | WANT_DELEGATION | OPT | FDELG (OPT) | Section 18.49 | 168 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 169 + | | WRITE | REQ | | Section 18.32 | 170 + +-----------------------+----------------------+---------------------+---------------------------+----------------+ 171 + 172 + 173 + Callback Operations 174 + =================== 175 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 176 + | Implementation status | Operation | REQ,REC, OPT or NMI | Feature (REQ, REC or OPT) | Definition | 177 + +=======================+=========================+=====================+===========================+===============+ 178 + | | CB_GETATTR | OPT | FDELG (REQ) | Section 20.1 | 179 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 180 + | I | CB_LAYOUTRECALL | OPT | pNFS (REQ) | Section 20.3 | 181 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 182 + | NS* | CB_NOTIFY | OPT | DDELG (REQ) | Section 20.4 | 183 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 184 + | NS* | CB_NOTIFY_DEVICEID | OPT | pNFS (OPT) | Section 20.12 | 185 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 186 + | NS* | CB_NOTIFY_LOCK | OPT | | Section 20.11 | 187 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 188 + | NS* | CB_PUSH_DELEG | OPT | FDELG (OPT) | Section 20.5 | 189 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 190 + | | CB_RECALL | OPT | FDELG, | Section 20.2 | 191 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 192 + | | | | DDELG, pNFS | | 193 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 194 + | | | | (REQ) | | 195 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 196 + | NS* | CB_RECALL_ANY | OPT | FDELG, | Section 20.6 | 197 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 198 + | | | | DDELG, pNFS | | 199 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 200 + | | | | (REQ) | | 201 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 202 + | NS | CB_RECALL_SLOT | REQ | | Section 20.8 | 203 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 204 + | NS* | CB_RECALLABLE_OBJ_AVAIL | OPT | DDELG, pNFS | Section 20.7 | 205 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 206 + | | | | (REQ) | | 207 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 208 + | I | CB_SEQUENCE | OPT | FDELG, | Section 20.9 | 209 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 210 + | | | | DDELG, pNFS | | 211 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 212 + | | | | (REQ) | | 213 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 214 + | NS* | CB_WANTS_CANCELLED | OPT | FDELG, | Section 20.10 | 215 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 216 + | | | | DDELG, pNFS | | 217 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 218 + | | | | (REQ) | | 219 + +-----------------------+-------------------------+---------------------+---------------------------+---------------+ 220 + 221 + 222 + Implementation notes: 223 + ===================== 224 + 225 + SSV: 226 + The spec claims this is mandatory, but we don't actually know of any 227 + implementations, so we're ignoring it for now. The server returns 228 + NFS4ERR_ENCR_ALG_UNSUPP on EXCHANGE_ID, which should be future-proof. 229 + 230 + GSS on the backchannel: 231 + Again, theoretically required but not widely implemented (in 232 + particular, the current Linux client doesn't request it). We return 233 + NFS4ERR_ENCR_ALG_UNSUPP on CREATE_SESSION. 234 + 235 + DELEGPURGE: 236 + mandatory only for servers that support CLAIM_DELEGATE_PREV and/or 237 + CLAIM_DELEG_PREV_FH (which allows clients to keep delegations that 238 + persist across client reboots). Thus we need not implement this for 239 + now. 240 + 241 + EXCHANGE_ID: 242 + implementation ids are ignored 243 + 244 + CREATE_SESSION: 245 + backchannel attributes are ignored 246 + 247 + SEQUENCE: 248 + no support for dynamic slot table renegotiation (optional) 249 + 250 + Nonstandard compound limitations: 251 + No support for a sessions fore channel RPC compound that requires both a 252 + ca_maxrequestsize request and a ca_maxresponsesize reply, so we may 253 + fail to live up to the promise we made in CREATE_SESSION fore channel 254 + negotiation. 255 + 256 + See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.
-173
Documentation/filesystems/nfs/nfs41-server.txt
··· 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 enabled by default. 9 - It can be disabled 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. You can use rpc.nfsd 12 - for this; see rpc.nfsd(8). 13 - 14 - (Warning: older servers will interpret "+4.1" and "-4.1" as "+4" and 15 - "-4", respectively. Therefore, code meant to work on both new and old 16 - kernels must turn 4.1 on or off *before* turning support for version 4 17 - on or off; rpc.nfsd does this correctly.) 18 - 19 - The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based 20 - on RFC 5661. 21 - 22 - From the many new features in NFSv4.1 the current implementation 23 - focuses on the mandatory-to-implement NFSv4.1 Sessions, providing 24 - "exactly once" semantics and better control and throttling of the 25 - resources allocated for each client. 26 - 27 - The table below, taken from the NFSv4.1 document, lists 28 - the operations that are mandatory to implement (REQ), optional 29 - (OPT), and NFSv4.0 operations that are required not to implement (MNI) 30 - in minor version 1. The first column indicates the operations that 31 - are not supported yet by the linux server implementation. 32 - 33 - The OPTIONAL features identified and their abbreviations are as follows: 34 - pNFS Parallel NFS 35 - FDELG File Delegations 36 - DDELG Directory Delegations 37 - 38 - The following abbreviations indicate the linux server implementation status. 39 - I Implemented NFSv4.1 operations. 40 - NS Not Supported. 41 - NS* Unimplemented optional feature. 42 - 43 - Operations 44 - 45 - +----------------------+------------+--------------+----------------+ 46 - | Operation | REQ, REC, | Feature | Definition | 47 - | | OPT, or | (REQ, REC, | | 48 - | | MNI | or OPT) | | 49 - +----------------------+------------+--------------+----------------+ 50 - | ACCESS | REQ | | Section 18.1 | 51 - I | BACKCHANNEL_CTL | REQ | | Section 18.33 | 52 - I | BIND_CONN_TO_SESSION | REQ | | Section 18.34 | 53 - | CLOSE | REQ | | Section 18.2 | 54 - | COMMIT | REQ | | Section 18.3 | 55 - | CREATE | REQ | | Section 18.4 | 56 - I | CREATE_SESSION | REQ | | Section 18.36 | 57 - NS*| DELEGPURGE | OPT | FDELG (REQ) | Section 18.5 | 58 - | DELEGRETURN | OPT | FDELG, | Section 18.6 | 59 - | | | DDELG, pNFS | | 60 - | | | (REQ) | | 61 - I | DESTROY_CLIENTID | REQ | | Section 18.50 | 62 - I | DESTROY_SESSION | REQ | | Section 18.37 | 63 - I | EXCHANGE_ID | REQ | | Section 18.35 | 64 - I | FREE_STATEID | REQ | | Section 18.38 | 65 - | GETATTR | REQ | | Section 18.7 | 66 - I | GETDEVICEINFO | OPT | pNFS (REQ) | Section 18.40 | 67 - NS*| GETDEVICELIST | OPT | pNFS (OPT) | Section 18.41 | 68 - | GETFH | REQ | | Section 18.8 | 69 - NS*| GET_DIR_DELEGATION | OPT | DDELG (REQ) | Section 18.39 | 70 - I | LAYOUTCOMMIT | OPT | pNFS (REQ) | Section 18.42 | 71 - I | LAYOUTGET | OPT | pNFS (REQ) | Section 18.43 | 72 - I | LAYOUTRETURN | OPT | pNFS (REQ) | Section 18.44 | 73 - | LINK | OPT | | Section 18.9 | 74 - | LOCK | REQ | | Section 18.10 | 75 - | LOCKT | REQ | | Section 18.11 | 76 - | LOCKU | REQ | | Section 18.12 | 77 - | LOOKUP | REQ | | Section 18.13 | 78 - | LOOKUPP | REQ | | Section 18.14 | 79 - | NVERIFY | REQ | | Section 18.15 | 80 - | OPEN | REQ | | Section 18.16 | 81 - NS*| OPENATTR | OPT | | Section 18.17 | 82 - | OPEN_CONFIRM | MNI | | N/A | 83 - | OPEN_DOWNGRADE | REQ | | Section 18.18 | 84 - | PUTFH | REQ | | Section 18.19 | 85 - | PUTPUBFH | REQ | | Section 18.20 | 86 - | PUTROOTFH | REQ | | Section 18.21 | 87 - | READ | REQ | | Section 18.22 | 88 - | READDIR | REQ | | Section 18.23 | 89 - | READLINK | OPT | | Section 18.24 | 90 - | RECLAIM_COMPLETE | REQ | | Section 18.51 | 91 - | RELEASE_LOCKOWNER | MNI | | N/A | 92 - | REMOVE | REQ | | Section 18.25 | 93 - | RENAME | REQ | | Section 18.26 | 94 - | RENEW | MNI | | N/A | 95 - | RESTOREFH | REQ | | Section 18.27 | 96 - | SAVEFH | REQ | | Section 18.28 | 97 - | SECINFO | REQ | | Section 18.29 | 98 - I | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, | 99 - | | | layout (REQ) | Section 13.12 | 100 - I | SEQUENCE | REQ | | Section 18.46 | 101 - | SETATTR | REQ | | Section 18.30 | 102 - | SETCLIENTID | MNI | | N/A | 103 - | SETCLIENTID_CONFIRM | MNI | | N/A | 104 - NS | SET_SSV | REQ | | Section 18.47 | 105 - I | TEST_STATEID | REQ | | Section 18.48 | 106 - | VERIFY | REQ | | Section 18.31 | 107 - NS*| WANT_DELEGATION | OPT | FDELG (OPT) | Section 18.49 | 108 - | WRITE | REQ | | Section 18.32 | 109 - 110 - Callback Operations 111 - 112 - +-------------------------+-----------+-------------+---------------+ 113 - | Operation | REQ, REC, | Feature | Definition | 114 - | | OPT, or | (REQ, REC, | | 115 - | | MNI | or OPT) | | 116 - +-------------------------+-----------+-------------+---------------+ 117 - | CB_GETATTR | OPT | FDELG (REQ) | Section 20.1 | 118 - I | CB_LAYOUTRECALL | OPT | pNFS (REQ) | Section 20.3 | 119 - NS*| CB_NOTIFY | OPT | DDELG (REQ) | Section 20.4 | 120 - NS*| CB_NOTIFY_DEVICEID | OPT | pNFS (OPT) | Section 20.12 | 121 - NS*| CB_NOTIFY_LOCK | OPT | | Section 20.11 | 122 - NS*| CB_PUSH_DELEG | OPT | FDELG (OPT) | Section 20.5 | 123 - | CB_RECALL | OPT | FDELG, | Section 20.2 | 124 - | | | DDELG, pNFS | | 125 - | | | (REQ) | | 126 - NS*| CB_RECALL_ANY | OPT | FDELG, | Section 20.6 | 127 - | | | DDELG, pNFS | | 128 - | | | (REQ) | | 129 - NS | CB_RECALL_SLOT | REQ | | Section 20.8 | 130 - NS*| CB_RECALLABLE_OBJ_AVAIL | OPT | DDELG, pNFS | Section 20.7 | 131 - | | | (REQ) | | 132 - I | CB_SEQUENCE | OPT | FDELG, | Section 20.9 | 133 - | | | DDELG, pNFS | | 134 - | | | (REQ) | | 135 - NS*| CB_WANTS_CANCELLED | OPT | FDELG, | Section 20.10 | 136 - | | | DDELG, pNFS | | 137 - | | | (REQ) | | 138 - +-------------------------+-----------+-------------+---------------+ 139 - 140 - Implementation notes: 141 - 142 - SSV: 143 - * The spec claims this is mandatory, but we don't actually know of any 144 - implementations, so we're ignoring it for now. The server returns 145 - NFS4ERR_ENCR_ALG_UNSUPP on EXCHANGE_ID, which should be future-proof. 146 - 147 - GSS on the backchannel: 148 - * Again, theoretically required but not widely implemented (in 149 - particular, the current Linux client doesn't request it). We return 150 - NFS4ERR_ENCR_ALG_UNSUPP on CREATE_SESSION. 151 - 152 - DELEGPURGE: 153 - * mandatory only for servers that support CLAIM_DELEGATE_PREV and/or 154 - CLAIM_DELEG_PREV_FH (which allows clients to keep delegations that 155 - persist across client reboots). Thus we need not implement this for 156 - now. 157 - 158 - EXCHANGE_ID: 159 - * implementation ids are ignored 160 - 161 - CREATE_SESSION: 162 - * backchannel attributes are ignored 163 - 164 - SEQUENCE: 165 - * no support for dynamic slot table renegotiation (optional) 166 - 167 - Nonstandard compound limitations: 168 - * No support for a sessions fore channel RPC compound that requires both a 169 - ca_maxrequestsize request and a ca_maxresponsesize reply, so we may 170 - fail to live up to the promise we made in CREATE_SESSION fore channel 171 - negotiation. 172 - 173 - See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.