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-NFSv4.1 Server Implementation
-
-Server support for minorversion 1 can be controlled using the
-/proc/fs/nfsd/versions control file. The string output returned
-by reading this file will contain either "+4.1" or "-4.1"
-correspondingly.
-
-Currently, server support for minorversion 1 is disabled by default.
-It can be enabled at run time by writing the string "+4.1" to
-the /proc/fs/nfsd/versions control file. Note that to write this
-control file, the nfsd service must be taken down. Use your user-mode
-nfs-utils to set this up; see rpc.nfsd(8)
-
-(Warning: older servers will interpret "+4.1" and "-4.1" as "+4" and
-"-4", respectively. Therefore, code meant to work on both new and old
-kernels must turn 4.1 on or off *before* turning support for version 4
-on or off; rpc.nfsd does this correctly.)
-
-The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
-on RFC 5661.
-
-From the many new features in NFSv4.1 the current implementation
-focuses on the mandatory-to-implement NFSv4.1 Sessions, providing
-"exactly once" semantics and better control and throttling of the
-resources allocated for each client.
-
-Other NFSv4.1 features, Parallel NFS operations in particular,
-are still under development out of tree.
-See http://wiki.linux-nfs.org/wiki/index.php/PNFS_prototype_design
-for more information.
-
-The current implementation is intended for developers only: while it
-does support ordinary file operations on clients we have tested against
-(including the linux client), it is incomplete in ways which may limit
-features unexpectedly, cause known bugs in rare cases, or cause
-interoperability problems with future clients. Known issues:
-
- - gss support is questionable: currently mounts with kerberos
- from a linux client are possible, but we aren't really
- conformant with the spec (for example, we don't use kerberos
- on the backchannel correctly).
- - Incomplete backchannel support: incomplete backchannel gss
- support and no support for BACKCHANNEL_CTL mean that
- callbacks (hence delegations and layouts) may not be
- available and clients confused by the incomplete
- implementation may fail.
- - We do not support SSV, which provides security for shared
- client-server state (thus preventing unauthorized tampering
- with locks and opens, for example). It is mandatory for
- servers to support this, though no clients use it yet.
- - Mandatory operations which we do not support, such as
- DESTROY_CLIENTID, are not currently used by clients, but will be
- (and the spec recommends their uses in common cases), and
- clients should not be expected to know how to recover from the
- case where they are not supported. This will eventually cause
- interoperability failures.
-
-In addition, some limitations are inherited from the current NFSv4
-implementation:
-
- - Incomplete delegation enforcement: if a file is renamed or
- unlinked by a local process, a client holding a delegation may
- continue to indefinitely allow opens of the file under the old
- name.
-
-The table below, taken from the NFSv4.1 document, lists
-the operations that are mandatory to implement (REQ), optional
-(OPT), and NFSv4.0 operations that are required not to implement (MNI)
-in minor version 1. The first column indicates the operations that
-are not supported yet by the linux server implementation.
-
-The OPTIONAL features identified and their abbreviations are as follows:
- pNFS Parallel NFS
- FDELG File Delegations
- DDELG Directory Delegations
-
-The following abbreviations indicate the linux server implementation status.
- I Implemented NFSv4.1 operations.
- NS Not Supported.
- NS* unimplemented optional feature.
- P pNFS features implemented out of tree.
- PNS pNFS features that are not supported yet (out of tree).
-
-Operations
-
- +----------------------+------------+--------------+----------------+
- | Operation | REQ, REC, | Feature | Definition |
- | | OPT, or | (REQ, REC, | |
- | | MNI | or OPT) | |
- +----------------------+------------+--------------+----------------+
- | ACCESS | REQ | | Section 18.1 |
-NS | BACKCHANNEL_CTL | REQ | | Section 18.33 |
-I | BIND_CONN_TO_SESSION | REQ | | Section 18.34 |
- | CLOSE | REQ | | Section 18.2 |
- | COMMIT | REQ | | Section 18.3 |
- | CREATE | REQ | | Section 18.4 |
-I | CREATE_SESSION | REQ | | Section 18.36 |
-NS*| DELEGPURGE | OPT | FDELG (REQ) | Section 18.5 |
- | DELEGRETURN | OPT | FDELG, | Section 18.6 |
- | | | DDELG, pNFS | |
- | | | (REQ) | |
-NS | DESTROY_CLIENTID | REQ | | Section 18.50 |
-I | DESTROY_SESSION | REQ | | Section 18.37 |
-I | EXCHANGE_ID | REQ | | Section 18.35 |
-I | FREE_STATEID | REQ | | Section 18.38 |
- | GETATTR | REQ | | Section 18.7 |
-P | GETDEVICEINFO | OPT | pNFS (REQ) | Section 18.40 |
-P | GETDEVICELIST | OPT | pNFS (OPT) | Section 18.41 |
- | GETFH | REQ | | Section 18.8 |
-NS*| GET_DIR_DELEGATION | OPT | DDELG (REQ) | Section 18.39 |
-P | LAYOUTCOMMIT | OPT | pNFS (REQ) | Section 18.42 |
-P | LAYOUTGET | OPT | pNFS (REQ) | Section 18.43 |
-P | LAYOUTRETURN | OPT | pNFS (REQ) | Section 18.44 |
- | LINK | OPT | | Section 18.9 |
- | LOCK | REQ | | Section 18.10 |
- | LOCKT | REQ | | Section 18.11 |
- | LOCKU | REQ | | Section 18.12 |
- | LOOKUP | REQ | | Section 18.13 |
- | LOOKUPP | REQ | | Section 18.14 |
- | NVERIFY | REQ | | Section 18.15 |
- | OPEN | REQ | | Section 18.16 |
-NS*| OPENATTR | OPT | | Section 18.17 |
- | OPEN_CONFIRM | MNI | | N/A |
- | OPEN_DOWNGRADE | REQ | | Section 18.18 |
- | PUTFH | REQ | | Section 18.19 |
- | PUTPUBFH | REQ | | Section 18.20 |
- | PUTROOTFH | REQ | | Section 18.21 |
- | READ | REQ | | Section 18.22 |
- | READDIR | REQ | | Section 18.23 |
- | READLINK | OPT | | Section 18.24 |
- | RECLAIM_COMPLETE | REQ | | Section 18.51 |
- | RELEASE_LOCKOWNER | MNI | | N/A |
- | REMOVE | REQ | | Section 18.25 |
- | RENAME | REQ | | Section 18.26 |
- | RENEW | MNI | | N/A |
- | RESTOREFH | REQ | | Section 18.27 |
- | SAVEFH | REQ | | Section 18.28 |
- | SECINFO | REQ | | Section 18.29 |
-I | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, |
- | | | layout (REQ) | Section 13.12 |
-I | SEQUENCE | REQ | | Section 18.46 |
- | SETATTR | REQ | | Section 18.30 |
- | SETCLIENTID | MNI | | N/A |
- | SETCLIENTID_CONFIRM | MNI | | N/A |
-NS | SET_SSV | REQ | | Section 18.47 |
-I | TEST_STATEID | REQ | | Section 18.48 |
- | VERIFY | REQ | | Section 18.31 |
-NS*| WANT_DELEGATION | OPT | FDELG (OPT) | Section 18.49 |
- | WRITE | REQ | | Section 18.32 |
-
-Callback Operations
-
- +-------------------------+-----------+-------------+---------------+
- | Operation | REQ, REC, | Feature | Definition |
- | | OPT, or | (REQ, REC, | |
- | | MNI | or OPT) | |
- +-------------------------+-----------+-------------+---------------+
- | CB_GETATTR | OPT | FDELG (REQ) | Section 20.1 |
-P | CB_LAYOUTRECALL | OPT | pNFS (REQ) | Section 20.3 |
-NS*| CB_NOTIFY | OPT | DDELG (REQ) | Section 20.4 |
-P | CB_NOTIFY_DEVICEID | OPT | pNFS (OPT) | Section 20.12 |
-NS*| CB_NOTIFY_LOCK | OPT | | Section 20.11 |
-NS*| CB_PUSH_DELEG | OPT | FDELG (OPT) | Section 20.5 |
- | CB_RECALL | OPT | FDELG, | Section 20.2 |
- | | | DDELG, pNFS | |
- | | | (REQ) | |
-NS*| CB_RECALL_ANY | OPT | FDELG, | Section 20.6 |
- | | | DDELG, pNFS | |
- | | | (REQ) | |
-NS | CB_RECALL_SLOT | REQ | | Section 20.8 |
-NS*| CB_RECALLABLE_OBJ_AVAIL | OPT | DDELG, pNFS | Section 20.7 |
- | | | (REQ) | |
-I | CB_SEQUENCE | OPT | FDELG, | Section 20.9 |
- | | | DDELG, pNFS | |
- | | | (REQ) | |
-NS*| CB_WANTS_CANCELLED | OPT | FDELG, | Section 20.10 |
- | | | DDELG, pNFS | |
- | | | (REQ) | |
- +-------------------------+-----------+-------------+---------------+
-
-Implementation notes:
-
-DELEGPURGE:
-* mandatory only for servers that support CLAIM_DELEGATE_PREV and/or
- CLAIM_DELEG_PREV_FH (which allows clients to keep delegations that
- persist across client reboots). Thus we need not implement this for
- now.
-
-EXCHANGE_ID:
-* only SP4_NONE state protection supported
-* implementation ids are ignored
-
-CREATE_SESSION:
-* backchannel attributes are ignored
-* backchannel security parameters are ignored
-
-SEQUENCE:
-* no support for dynamic slot table renegotiation (optional)
-
-Nonstandard compound limitations:
-* No support for a sessions fore channel RPC compound that requires both a
- ca_maxrequestsize request and a ca_maxresponsesize reply, so we may
- fail to live up to the promise we made in CREATE_SESSION fore channel
- negotiation.
-* No more than one IO operation (read, write, readdir) allowed per
- compound.
-
-See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.