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+NFSv4.1 Server Implementation
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+
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+Server support for minorversion 1 can be controlled using the
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+/proc/fs/nfsd/versions control file. The string output returned
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+by reading this file will contain either "+4.1" or "-4.1"
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+correspondingly.
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+
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+Currently, server support for minorversion 1 is disabled by default.
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+It can be enabled at run time by writing the string "+4.1" to
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+the /proc/fs/nfsd/versions control file. Note that to write this
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+control file, the nfsd service must be taken down. Use your user-mode
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+nfs-utils to set this up; see rpc.nfsd(8)
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+
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+The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
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+on the latest NFSv4.1 Internet Draft:
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+http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-29
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+
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+From the many new features in NFSv4.1 the current implementation
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+focuses on the mandatory-to-implement NFSv4.1 Sessions, providing
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+"exactly once" semantics and better control and throttling of the
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+resources allocated for each client.
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+
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+Other NFSv4.1 features, Parallel NFS operations in particular,
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+are still under development out of tree.
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+See http://wiki.linux-nfs.org/wiki/index.php/PNFS_prototype_design
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+for more information.
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+
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+The table below, taken from the NFSv4.1 document, lists
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+the operations that are mandatory to implement (REQ), optional
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+(OPT), and NFSv4.0 operations that are required not to implement (MNI)
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+in minor version 1. The first column indicates the operations that
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+are not supported yet by the linux server implementation.
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+
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+The OPTIONAL features identified and their abbreviations are as follows:
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+ pNFS Parallel NFS
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+ FDELG File Delegations
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+ DDELG Directory Delegations
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+
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+The following abbreviations indicate the linux server implementation status.
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+ I Implemented NFSv4.1 operations.
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+ NS Not Supported.
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+ NS* unimplemented optional feature.
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+ P pNFS features implemented out of tree.
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+ PNS pNFS features that are not supported yet (out of tree).
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+
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+Operations
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+
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+ +----------------------+------------+--------------+----------------+
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+ | Operation | REQ, REC, | Feature | Definition |
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+ | | OPT, or | (REQ, REC, | |
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+ | | MNI | or OPT) | |
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+ +----------------------+------------+--------------+----------------+
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+ | ACCESS | REQ | | Section 18.1 |
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+NS | BACKCHANNEL_CTL | REQ | | Section 18.33 |
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+NS | BIND_CONN_TO_SESSION | REQ | | Section 18.34 |
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+ | CLOSE | REQ | | Section 18.2 |
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+ | COMMIT | REQ | | Section 18.3 |
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+ | CREATE | REQ | | Section 18.4 |
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+I | CREATE_SESSION | REQ | | Section 18.36 |
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+NS*| DELEGPURGE | OPT | FDELG (REQ) | Section 18.5 |
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+ | DELEGRETURN | OPT | FDELG, | Section 18.6 |
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+ | | | DDELG, pNFS | |
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+ | | | (REQ) | |
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+NS | DESTROY_CLIENTID | REQ | | Section 18.50 |
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+I | DESTROY_SESSION | REQ | | Section 18.37 |
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+I | EXCHANGE_ID | REQ | | Section 18.35 |
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+NS | FREE_STATEID | REQ | | Section 18.38 |
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+ | GETATTR | REQ | | Section 18.7 |
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+P | GETDEVICEINFO | OPT | pNFS (REQ) | Section 18.40 |
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+P | GETDEVICELIST | OPT | pNFS (OPT) | Section 18.41 |
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+ | GETFH | REQ | | Section 18.8 |
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+NS*| GET_DIR_DELEGATION | OPT | DDELG (REQ) | Section 18.39 |
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+P | LAYOUTCOMMIT | OPT | pNFS (REQ) | Section 18.42 |
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+P | LAYOUTGET | OPT | pNFS (REQ) | Section 18.43 |
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+P | LAYOUTRETURN | OPT | pNFS (REQ) | Section 18.44 |
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+ | LINK | OPT | | Section 18.9 |
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+ | LOCK | REQ | | Section 18.10 |
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+ | LOCKT | REQ | | Section 18.11 |
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+ | LOCKU | REQ | | Section 18.12 |
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+ | LOOKUP | REQ | | Section 18.13 |
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+ | LOOKUPP | REQ | | Section 18.14 |
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+ | NVERIFY | REQ | | Section 18.15 |
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+ | OPEN | REQ | | Section 18.16 |
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+NS*| OPENATTR | OPT | | Section 18.17 |
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+ | OPEN_CONFIRM | MNI | | N/A |
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+ | OPEN_DOWNGRADE | REQ | | Section 18.18 |
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+ | PUTFH | REQ | | Section 18.19 |
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+ | PUTPUBFH | REQ | | Section 18.20 |
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+ | PUTROOTFH | REQ | | Section 18.21 |
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+ | READ | REQ | | Section 18.22 |
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+ | READDIR | REQ | | Section 18.23 |
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+ | READLINK | OPT | | Section 18.24 |
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+NS | RECLAIM_COMPLETE | REQ | | Section 18.51 |
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+ | RELEASE_LOCKOWNER | MNI | | N/A |
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+ | REMOVE | REQ | | Section 18.25 |
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+ | RENAME | REQ | | Section 18.26 |
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+ | RENEW | MNI | | N/A |
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+ | RESTOREFH | REQ | | Section 18.27 |
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+ | SAVEFH | REQ | | Section 18.28 |
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+ | SECINFO | REQ | | Section 18.29 |
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+NS | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, |
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+ | | | layout (REQ) | Section 13.12 |
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+I | SEQUENCE | REQ | | Section 18.46 |
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+ | SETATTR | REQ | | Section 18.30 |
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+ | SETCLIENTID | MNI | | N/A |
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+ | SETCLIENTID_CONFIRM | MNI | | N/A |
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+NS | SET_SSV | REQ | | Section 18.47 |
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+NS | TEST_STATEID | REQ | | Section 18.48 |
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+ | VERIFY | REQ | | Section 18.31 |
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+NS*| WANT_DELEGATION | OPT | FDELG (OPT) | Section 18.49 |
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+ | WRITE | REQ | | Section 18.32 |
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+
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+Callback Operations
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+
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+ +-------------------------+-----------+-------------+---------------+
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+ | Operation | REQ, REC, | Feature | Definition |
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+ | | OPT, or | (REQ, REC, | |
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+ | | MNI | or OPT) | |
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+ +-------------------------+-----------+-------------+---------------+
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+ | CB_GETATTR | OPT | FDELG (REQ) | Section 20.1 |
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+P | CB_LAYOUTRECALL | OPT | pNFS (REQ) | Section 20.3 |
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+NS*| CB_NOTIFY | OPT | DDELG (REQ) | Section 20.4 |
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+P | CB_NOTIFY_DEVICEID | OPT | pNFS (OPT) | Section 20.12 |
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+NS*| CB_NOTIFY_LOCK | OPT | | Section 20.11 |
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+NS*| CB_PUSH_DELEG | OPT | FDELG (OPT) | Section 20.5 |
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+ | CB_RECALL | OPT | FDELG, | Section 20.2 |
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+ | | | DDELG, pNFS | |
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+ | | | (REQ) | |
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+NS*| CB_RECALL_ANY | OPT | FDELG, | Section 20.6 |
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+ | | | DDELG, pNFS | |
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+ | | | (REQ) | |
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+NS | CB_RECALL_SLOT | REQ | | Section 20.8 |
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+NS*| CB_RECALLABLE_OBJ_AVAIL | OPT | DDELG, pNFS | Section 20.7 |
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+ | | | (REQ) | |
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+I | CB_SEQUENCE | OPT | FDELG, | Section 20.9 |
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+ | | | DDELG, pNFS | |
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+ | | | (REQ) | |
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+NS*| CB_WANTS_CANCELLED | OPT | FDELG, | Section 20.10 |
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+ | | | DDELG, pNFS | |
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+ | | | (REQ) | |
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+ +-------------------------+-----------+-------------+---------------+
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+
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+Implementation notes:
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+
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+EXCHANGE_ID:
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+* only SP4_NONE state protection supported
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+* implementation ids are ignored
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+
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+CREATE_SESSION:
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+* backchannel attributes are ignored
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+* backchannel security parameters are ignored
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+
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+SEQUENCE:
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+* no support for dynamic slot table renegotiation (optional)
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+
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+nfsv4.1 COMPOUND rules:
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+The following cases aren't supported yet:
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+* Enforcing of NFS4ERR_NOT_ONLY_OP for: BIND_CONN_TO_SESSION, CREATE_SESSION,
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+ DESTROY_CLIENTID, DESTROY_SESSION, EXCHANGE_ID.
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+* DESTROY_SESSION MUST be the final operation in the COMPOUND request.
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+
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Benny Halevy