1 =============================
2 NFSv4.1 Server Implementation
3 =============================
4
5 Server support for minorversion 1 can be contr
6 /proc/fs/nfsd/versions control file. The stri
7 by reading this file will contain either "+4.1
8 correspondingly.
9
10 Currently, server support for minorversion 1 i
11 It can be disabled at run time by writing the
12 the /proc/fs/nfsd/versions control file. Note
13 control file, the nfsd service must be taken d
14 for this; see rpc.nfsd(8).
15
16 (Warning: older servers will interpret "+4.1"
17 "-4", respectively. Therefore, code meant to
18 kernels must turn 4.1 on or off *before* turni
19 on or off; rpc.nfsd does this correctly.)
20
21 The NFSv4 minorversion 1 (NFSv4.1) implementat
22 on RFC 5661.
23
24 From the many new features in NFSv4.1 the curr
25 focuses on the mandatory-to-implement NFSv4.1
26 "exactly once" semantics and better control an
27 resources allocated for each client.
28
29 The table below, taken from the NFSv4.1 docume
30 the operations that are mandatory to implement
31 (OPT), and NFSv4.0 operations that are require
32 in minor version 1. The first column indicate
33 are not supported yet by the linux server impl
34
35 The OPTIONAL features identified and their abb
36
37 - **pNFS** Parallel NFS
38 - **FDELG** File Delegations
39 - **DDELG** Directory Delegations
40
41 The following abbreviations indicate the linux
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
52 +=======================+=====================
53 | | ACCESS
54 +-----------------------+---------------------
55 | I | BACKCHANNEL_CTL
56 +-----------------------+---------------------
57 | I | BIND_CONN_TO_SESSION
58 +-----------------------+---------------------
59 | | CLOSE
60 +-----------------------+---------------------
61 | | COMMIT
62 +-----------------------+---------------------
63 | | CREATE
64 +-----------------------+---------------------
65 | I | CREATE_SESSION
66 +-----------------------+---------------------
67 | NS* | DELEGPURGE
68 +-----------------------+---------------------
69 | | DELEGRETURN
70 +-----------------------+---------------------
71 | |
72 +-----------------------+---------------------
73 | |
74 +-----------------------+---------------------
75 | I | DESTROY_CLIENTID
76 +-----------------------+---------------------
77 | I | DESTROY_SESSION
78 +-----------------------+---------------------
79 | I | EXCHANGE_ID
80 +-----------------------+---------------------
81 | I | FREE_STATEID
82 +-----------------------+---------------------
83 | | GETATTR
84 +-----------------------+---------------------
85 | I | GETDEVICEINFO
86 +-----------------------+---------------------
87 | NS* | GETDEVICELIST
88 +-----------------------+---------------------
89 | | GETFH
90 +-----------------------+---------------------
91 | NS* | GET_DIR_DELEGATION
92 +-----------------------+---------------------
93 | I | LAYOUTCOMMIT
94 +-----------------------+---------------------
95 | I | LAYOUTGET
96 +-----------------------+---------------------
97 | I | LAYOUTRETURN
98 +-----------------------+---------------------
99 | | LINK
100 +-----------------------+---------------------
101 | | LOCK
102 +-----------------------+---------------------
103 | | LOCKT
104 +-----------------------+---------------------
105 | | LOCKU
106 +-----------------------+---------------------
107 | | LOOKUP
108 +-----------------------+---------------------
109 | | LOOKUPP
110 +-----------------------+---------------------
111 | | NVERIFY
112 +-----------------------+---------------------
113 | | OPEN
114 +-----------------------+---------------------
115 | NS* | OPENATTR
116 +-----------------------+---------------------
117 | | OPEN_CONFIRM
118 +-----------------------+---------------------
119 | | OPEN_DOWNGRADE
120 +-----------------------+---------------------
121 | | PUTFH
122 +-----------------------+---------------------
123 | | PUTPUBFH
124 +-----------------------+---------------------
125 | | PUTROOTFH
126 +-----------------------+---------------------
127 | | READ
128 +-----------------------+---------------------
129 | | READDIR
130 +-----------------------+---------------------
131 | | READLINK
132 +-----------------------+---------------------
133 | | RECLAIM_COMPLETE
134 +-----------------------+---------------------
135 | | RELEASE_LOCKOWNER
136 +-----------------------+---------------------
137 | | REMOVE
138 +-----------------------+---------------------
139 | | RENAME
140 +-----------------------+---------------------
141 | | RENEW
142 +-----------------------+---------------------
143 | | RESTOREFH
144 +-----------------------+---------------------
145 | | SAVEFH
146 +-----------------------+---------------------
147 | | SECINFO
148 +-----------------------+---------------------
149 | I | SECINFO_NO_NAME
150 +-----------------------+---------------------
151 | |
152 +-----------------------+---------------------
153 | I | SEQUENCE
154 +-----------------------+---------------------
155 | | SETATTR
156 +-----------------------+---------------------
157 | | SETCLIENTID
158 +-----------------------+---------------------
159 | | SETCLIENTID_CONFIRM
160 +-----------------------+---------------------
161 | NS | SET_SSV
162 +-----------------------+---------------------
163 | I | TEST_STATEID
164 +-----------------------+---------------------
165 | | VERIFY
166 +-----------------------+---------------------
167 | NS* | WANT_DELEGATION
168 +-----------------------+---------------------
169 | | WRITE
170 +-----------------------+---------------------
171
172
173 Callback Operations
174 ===================
175 +-----------------------+---------------------
176 | Implementation status | Operation
177 +=======================+=====================
178 | | CB_GETATTR
179 +-----------------------+---------------------
180 | I | CB_LAYOUTRECALL
181 +-----------------------+---------------------
182 | NS* | CB_NOTIFY
183 +-----------------------+---------------------
184 | NS* | CB_NOTIFY_DEVICEID
185 +-----------------------+---------------------
186 | NS* | CB_NOTIFY_LOCK
187 +-----------------------+---------------------
188 | NS* | CB_PUSH_DELEG
189 +-----------------------+---------------------
190 | | CB_RECALL
191 +-----------------------+---------------------
192 | |
193 +-----------------------+---------------------
194 | |
195 +-----------------------+---------------------
196 | NS* | CB_RECALL_ANY
197 +-----------------------+---------------------
198 | |
199 +-----------------------+---------------------
200 | |
201 +-----------------------+---------------------
202 | NS | CB_RECALL_SLOT
203 +-----------------------+---------------------
204 | NS* | CB_RECALLABLE_OBJ_AV
205 +-----------------------+---------------------
206 | |
207 +-----------------------+---------------------
208 | I | CB_SEQUENCE
209 +-----------------------+---------------------
210 | |
211 +-----------------------+---------------------
212 | |
213 +-----------------------+---------------------
214 | NS* | CB_WANTS_CANCELLED
215 +-----------------------+---------------------
216 | |
217 +-----------------------+---------------------
218 | |
219 +-----------------------+---------------------
220
221
222 Implementation notes:
223 =====================
224
225 SSV:
226 The spec claims this is mandatory, but we do
227 implementations, so we're ignoring it for no
228 NFS4ERR_ENCR_ALG_UNSUPP on EXCHANGE_ID, whic
229
230 GSS on the backchannel:
231 Again, theoretically required but not widely
232 particular, the current Linux client doesn't
233 NFS4ERR_ENCR_ALG_UNSUPP on CREATE_SESSION.
234
235 DELEGPURGE:
236 mandatory only for servers that support CLAI
237 CLAIM_DELEG_PREV_FH (which allows clients to
238 persist across client reboots). Thus we nee
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 renegotiat
249
250 Nonstandard compound limitations:
251 No support for a sessions fore channel RPC c
252 ca_maxrequestsize request and a ca_maxrespon
253 fail to live up to the promise we made in CR
254 negotiation.
255
256 See also http://wiki.linux-nfs.org/wiki/index.
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