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linux/Documentation/filesystems/nfs/nfs41-server.txt

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nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
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.
nfsd4: update 4.1 nfsd status documentation This has gone a little stale. Reported-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-11-19 22:50:48 +08:00
Currently, server support for minorversion 1 is enabled by default.
It can be disabled at run time by writing the string "-4.1" to
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
the /proc/fs/nfsd/versions control file. Note that to write this
nfsd4: update 4.1 nfsd status documentation This has gone a little stale. Reported-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-11-19 22:50:48 +08:00
control file, the nfsd service must be taken down. You can use rpc.nfsd
for this; see rpc.nfsd(8).
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
nfsd: revise 4.1 status documentation Some small updates, a caveat about the minorversion control interface, and an attempt to put missing features in context. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-09-21 05:01:33 +08:00
(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.)
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
The NFSv4 minorversion 1 (NFSv4.1) implementation in nfsd is based
nfsd: 4.1 has an rfc number No need to refer to an internet draft; there's an RFC now. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-01-21 06:17:04 +08:00
on RFC 5661.
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
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 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 |
nfsd4: implement backchannel_ctl operation This operation is mandatory for servers to implement. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-11-02 06:09:48 +08:00
I | BACKCHANNEL_CTL | REQ | | Section 18.33 |
nfsd4: update nfsv4.1 implementation notes Update documentation to reflect recent progress. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-19 06:40:21 +08:00
I | BIND_CONN_TO_SESSION | REQ | | Section 18.34 |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
| 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) | |
nfsd4: update documentation on 4.1 progress Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-11-08 08:41:51 +08:00
I | DESTROY_CLIENTID | REQ | | Section 18.50 |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
I | DESTROY_SESSION | REQ | | Section 18.37 |
I | EXCHANGE_ID | REQ | | Section 18.35 |
nfsd4: update nfsv4.1 implementation notes Update documentation to reflect recent progress. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-19 06:40:21 +08:00
I | FREE_STATEID | REQ | | Section 18.38 |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
| 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 |
nfsd4: implement reclaim_complete This is a mandatory operation. Also, here (not in open) is where we should be committing the reboot recovery information. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-20 03:11:28 +08:00
| RECLAIM_COMPLETE | REQ | | Section 18.51 |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
| 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 |
nfsd4: update nfsv4.1 implementation notes Update documentation to reflect recent progress. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-19 06:40:21 +08:00
I | SECINFO_NO_NAME | REC | pNFS files | Section 18.45, |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
| | | 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 |
nfsd4: update nfsv4.1 implementation notes Update documentation to reflect recent progress. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-19 06:40:21 +08:00
I | TEST_STATEID | REQ | | Section 18.48 |
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
| 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:
nfsd4: update 4.1 nfsd status documentation This has gone a little stale. Reported-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-11-19 22:50:48 +08:00
SSV:
* The spec claims this is mandatory, but we don't actually know of any
implementations, so we're ignoring it for now. The server returns
NFS4ERR_ENCR_ALG_UNSUPP on EXCHANGE_ID, which should be future-proof.
GSS on the backchannel:
* Again, theoretically required but not widely implemented (in
particular, the current Linux client doesn't request it). We return
NFS4ERR_ENCR_ALG_UNSUPP on CREATE_SESSION.
nfsd: revise 4.1 status documentation Some small updates, a caveat about the minorversion control interface, and an attempt to put missing features in context. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-09-21 05:01:33 +08:00
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.
nfsd41: Documentation/filesystems/nfs41-server.txt Initial nfs41 server write up describing the status of the linux server implementation. [nfsd41: document unenforced nfs41 compound ordering rules.] [get rid of CONFIG_NFSD_V4_1] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-03 13:29:20 +08:00
EXCHANGE_ID:
* implementation ids are ignored
CREATE_SESSION:
* backchannel attributes are ignored
SEQUENCE:
* no support for dynamic slot table renegotiation (optional)
nfsd41: use sv_max_mesg for forechannel max sizes ca_maxresponsesize and ca_maxrequest size include the RPC header. sv_max_mesg is sv_max_payolad plus a page for overhead and is used in svc_init_buffer to allocate server buffer space for both the request and reply. Note that this means we can service an RPC compound that requires ca_maxrequestsize (MAXWRITE) or ca_max_responsesize (MAXREAD) but that we do not support an RPC compound that requires both ca_maxrequestsize and ca_maxresponsesize. Signed-off-by: Andy Adamson <andros@netapp.com> [bfields@citi.umich.edu: more documentation updates] Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-09-24 09:32:21 +08:00
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.
nfsd4: update nfsv4.1 implementation notes Update documentation to reflect recent progress. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-19 06:40:21 +08:00
See also http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues.