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3ef17288 BH |
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 |