tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
+1
Documentation/filesystems/nfs/index.rst
+256
Documentation/filesystems/nfs/nfs41-server.rst
+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
-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.