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1NFSv4.1 Server Implementation
2
3Server support for minorversion 1 can be controlled using the
4/proc/fs/nfsd/versions control file. The string output returned
5by reading this file will contain either "+4.1" or "-4.1"
6correspondingly.
7
8Currently, server support for minorversion 1 is disabled by default.
9It can be enabled at run time by writing the string "+4.1" to
10the /proc/fs/nfsd/versions control file. Note that to write this
11control file, the nfsd service must be taken down. Use your user-mode
12nfs-utils to set this up; see rpc.nfsd(8)
13
14The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
15on the latest NFSv4.1 Internet Draft:
16http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-29
17
18From the many new features in NFSv4.1 the current implementation
19focuses on the mandatory-to-implement NFSv4.1 Sessions, providing
20"exactly once" semantics and better control and throttling of the
21resources allocated for each client.
22
23Other NFSv4.1 features, Parallel NFS operations in particular,
24are still under development out of tree.
25See http://wiki.linux-nfs.org/wiki/index.php/PNFS_prototype_design
26for more information.
27
28The table below, taken from the NFSv4.1 document, lists
29the operations that are mandatory to implement (REQ), optional
30(OPT), and NFSv4.0 operations that are required not to implement (MNI)
31in minor version 1. The first column indicates the operations that
32are not supported yet by the linux server implementation.
33
34The OPTIONAL features identified and their abbreviations are as follows:
35 pNFS Parallel NFS
36 FDELG File Delegations
37 DDELG Directory Delegations
38
39The 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
46Operations
47
48 +----------------------+------------+--------------+----------------+
49 | Operation | REQ, REC, | Feature | Definition |
50 | | OPT, or | (REQ, REC, | |
51 | | MNI | or OPT) | |
52 +----------------------+------------+--------------+----------------+
53 | ACCESS | REQ | | Section 18.1 |
54NS | BACKCHANNEL_CTL | REQ | | Section 18.33 |
55NS | 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 |
59I | CREATE_SESSION | REQ | | Section 18.36 |
60NS*| DELEGPURGE | OPT | FDELG (REQ) | Section 18.5 |
61 | DELEGRETURN | OPT | FDELG, | Section 18.6 |
62 | | | DDELG, pNFS | |
63 | | | (REQ) | |
64NS | DESTROY_CLIENTID | REQ | | Section 18.50 |
65I | DESTROY_SESSION | REQ | | Section 18.37 |
66I | EXCHANGE_ID | REQ | | Section 18.35 |
67NS | FREE_STATEID | REQ | | Section 18.38 |
68 | GETATTR | REQ | | Section 18.7 |
69P | GETDEVICEINFO | OPT | pNFS (REQ) | Section 18.40 |
70P | GETDEVICELIST | OPT | pNFS (OPT) | Section 18.41 |
71 | GETFH | REQ | | Section 18.8 |
72NS*| GET_DIR_DELEGATION | OPT | DDELG (REQ) | Section 18.39 |
73P | LAYOUTCOMMIT | OPT | pNFS (REQ) | Section 18.42 |
74P | LAYOUTGET | OPT | pNFS (REQ) | Section 18.43 |
75P | 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 |
84NS*| 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 |
93NS | 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 |
101NS | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, |
102 | | | layout (REQ) | Section 13.12 |
103I | SEQUENCE | REQ | | Section 18.46 |
104 | SETATTR | REQ | | Section 18.30 |
105 | SETCLIENTID | MNI | | N/A |
106 | SETCLIENTID_CONFIRM | MNI | | N/A |
107NS | SET_SSV | REQ | | Section 18.47 |
108NS | TEST_STATEID | REQ | | Section 18.48 |
109 | VERIFY | REQ | | Section 18.31 |
110NS*| WANT_DELEGATION | OPT | FDELG (OPT) | Section 18.49 |
111 | WRITE | REQ | | Section 18.32 |
112
113Callback 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 |
121P | CB_LAYOUTRECALL | OPT | pNFS (REQ) | Section 20.3 |
122NS*| CB_NOTIFY | OPT | DDELG (REQ) | Section 20.4 |
123P | CB_NOTIFY_DEVICEID | OPT | pNFS (OPT) | Section 20.12 |
124NS*| CB_NOTIFY_LOCK | OPT | | Section 20.11 |
125NS*| CB_PUSH_DELEG | OPT | FDELG (OPT) | Section 20.5 |
126 | CB_RECALL | OPT | FDELG, | Section 20.2 |
127 | | | DDELG, pNFS | |
128 | | | (REQ) | |
129NS*| CB_RECALL_ANY | OPT | FDELG, | Section 20.6 |
130 | | | DDELG, pNFS | |
131 | | | (REQ) | |
132NS | CB_RECALL_SLOT | REQ | | Section 20.8 |
133NS*| CB_RECALLABLE_OBJ_AVAIL | OPT | DDELG, pNFS | Section 20.7 |
134 | | | (REQ) | |
135I | CB_SEQUENCE | OPT | FDELG, | Section 20.9 |
136 | | | DDELG, pNFS | |
137 | | | (REQ) | |
138NS*| CB_WANTS_CANCELLED | OPT | FDELG, | Section 20.10 |
139 | | | DDELG, pNFS | |
140 | | | (REQ) | |
141 +-------------------------+-----------+-------------+---------------+
142
143Implementation notes:
144
145EXCHANGE_ID:
146* only SP4_NONE state protection supported
147* implementation ids are ignored
148
149CREATE_SESSION:
150* backchannel attributes are ignored
151* backchannel security parameters are ignored
152
153SEQUENCE:
154* no support for dynamic slot table renegotiation (optional)
155
156nfsv4.1 COMPOUND rules:
157The 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
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