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* NFSD: Fix sparse warning in nfssvc.cChuck Lever2020-12-181-1/+0
| | | | | | | | | | | | fs/nfsd/nfssvc.c:36:6: warning: symbol 'inter_copy_offload_enable' was not declared. Should it be static? The parameter was added by commit ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy"). Relocate it into the source file that uses it, and make it static. This approach is similar to the nfs4_disable_idmapping, cltrack_prog, and cltrack_legacy_disable module parameters. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* nfsd: Record NFSv4 pre/post-op attributes as non-atomicTrond Myklebust2020-12-091-1/+1
| | | | | | | | For the case of NFSv4, specify to the client that the pre/post-op attributes were not recorded atomically with the main operation. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* nfsd: simplify nfsd4_change_infoJ. Bruce Fields2020-12-091-11/+0
| | | | | | | | | | It doesn't make sense to carry all these extra fields around. Just make everything into change attribute from the start. This is just cleanup, there should be no change in behavior. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Remove macros that are no longer usedChuck Lever2020-11-301-9/+0
| | | | | | | Now that all the NFSv4 decoder functions have been converted to make direct calls to the xdr helpers, remove the unused C macros. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Make nfsd4_ops::opnum a u32Chuck Lever2020-11-301-1/+1
| | | | | | Avoid passing a "pointer to int" argument to xdr_stream_decode_u32. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Replace READ* macros in nfsd4_decode_copy()Chuck Lever2020-11-301-1/+1
| | | Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Add a helper to decode state_protect4_aChuck Lever2020-11-301-1/+1
| | | | | | | | | | Refactor for clarity. Also, remove a stale comment. Commit ed94164398c9 ("nfsd: implement machine credential support for some operations") added support for SP4_MACH_CRED, so state_protect_a is no longer completely ignored. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Add helper to decode OPEN's open_claim4 argumentChuck Lever2020-11-301-1/+2
| | | | | | | | | | Refactor for clarity. Note that op_fname is the only instance of an NFSv4 filename stored in a struct xdr_netobj. Convert it to a u32/char * pair so that the new nfsd4_decode_filename() helper can be used. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Replace the internals of the READ_BUF() macroChuck Lever2020-11-301-8/+2
| | | | | | | | | | Convert the READ_BUF macro in nfs4xdr.c from open code to instead use the new xdr_stream-style decoders already in use by the encode side (and by the in-kernel NFS client implementation). Once this conversion is done, each individual NFSv4 argument decoder can be independently cleaned up to replace these macros with C code. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Add common helpers to decode void args and encode void resultsChuck Lever2020-11-301-2/+0
| | | | | | | Start off the conversion to xdr_stream by de-duplicating the functions that decode void arguments and encode void results. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD: Encoder and decoder functions are always presentChuck Lever2020-10-021-0/+1
| | | | | | | | | nfsd_dispatch() is a hot path. Let's optimize the XDR method calls for the by-far common case, which is that the XDR methods are indeed present. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: add structure definitions for xattr requests / responsesFrank van der Linden2020-07-131-0/+31
| | | | | | | Add the structures used in extended attribute request / response handling. Signed-off-by: Frank van der Linden <fllinden@amazon.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
* NFSD add nfs4 inter ssc to nfsd4_copyOlga Kornievskaia2019-12-091-0/+5
| | | | | | | | | | | Given a universal address, mount the source server from the destination server. Use an internal mount. Call the NFS client nfs42_ssc_open to obtain the NFS struct file suitable for nfsd_copy_range. Ability to do "inter" server-to-server depends on the an nfsd kernel parameter "inter_copy_offload_enable". Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
* NFSD: allow inter server COPY to have a STALE source server fhOlga Kornievskaia2019-12-091-0/+1
| | | | | | | | The inter server to server COPY source server filehandle is a foreign filehandle as the COPY is sent to the destination server. Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
* NFSD generalize nfsd4_compound_state flag namesOlga Kornievskaia2019-12-091-3/+3
| | | | | | Allow for sid_flag field non-stateid use. Signed-off-by: Andy Adamson <andros@netapp.com>
* NFSD add COPY_NOTIFY operationOlga Kornievskaia2019-12-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | Introducing the COPY_NOTIFY operation. Create a new unique stateid that will keep track of the copy state and the upcoming READs that will use that stateid. Each associated parent stateid has a list of copy notify stateids. A copy notify structure makes a copy of the parent stateid and a clientid and will use it to look up the parent stateid during the READ request (suggested by Trond Myklebust <trond.myklebust@hammerspace.com>). At nfs4_put_stid() time, we walk the list of the associated copy notify stateids and delete them. Laundromat thread will traverse globally stored copy notify stateid in idr and notice if any haven't been referenced in the lease period, if so, it'll remove them. Return single netaddr to advertise to the copy. Suggested-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Olga Kornievskaia <kolga@netapp.com> Signed-off-by: Andy Adamson <andros@netapp.com>
* NFSD COPY_NOTIFY xdrOlga Kornievskaia2019-12-091-0/+13
| | | | Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
* NFSD add ca_source_server<> to COPYOlga Kornievskaia2019-12-091-5/+7
| | | | | | | | Decode the ca_source_server list that's sent but only use the first one. Presence of non-zero list indicates an "inter" copy. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
* nfsd: hook up nfs4_preprocess_stateid_op to the nfsd_file cacheJeff Layton2019-08-191-10/+9
| | | | | | | | | | | | | Have nfs4_preprocess_stateid_op pass back a nfsd_file instead of a filp. Since we now presume that the struct file will be persistent in most cases, we can stop fiddling with the raparms in the read code. This also means that we don't really care about the rd_tmp_file field anymore. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: decode implementation idJ. Bruce Fields2019-07-031-0/+3
| | | | | | | | | | | | Decode the implementation ID and display in nfsd/clients/#/info. It may be help identify the client. It won't be used otherwise. (When this went into the protocol, I thought the implementation ID would be a slippery slope towards implementation-specific workarounds as with the http user-agent. But I guess I was wrong, the risk seems pretty low now.) Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: use 64-bit seconds fields in nfsd v4 codeJ. Bruce Fields2019-07-031-1/+1
| | | | | | | | | | | After commit 95582b008388 "vfs: change inode times to use struct timespec64" there are spots in the NFSv4 decoding where we decode the protocol into a struct timeval and then convert that into a timeval64. That's unnecesary in the NFSv4 case since the on-the-wire protocol also uses 64-bit values. So just fix up our code to use timeval64 everywhere. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD introduce async copy featureOlga Kornievskaia2018-09-251-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upon receiving a request for async copy, create a new kthread. If we get asynchronous request, make sure to copy the needed arguments/state from the stack before starting the copy. Then start the thread and reply back to the client indicating copy is asynchronous. nfsd_copy_file_range() will copy in a loop over the total number of bytes is needed to copy. In case a failure happens in the middle, we ignore the error and return how much we copied so far. Once done creating a workitem for the callback workqueue and send CB_OFFLOAD with the results. The lifetime of the copy stateid is bound to the vfs copy. This way we don't need to keep the nfsd_net structure for the callback. We could keep it around longer so that an OFFLOAD_STATUS that came late would still get results, but clients should be able to deal without that. We handle OFFLOAD_CANCEL by sending a signal to the copy thread and calling kthread_stop. A client should cancel any ongoing copies before calling DESTROY_CLIENT; if not, we return a CLIENT_BUSY error. If the client is destroyed for some other reason (lease expiration, or server shutdown), we must clean up any ongoing copies ourselves. Signed-off-by: Olga Kornievskaia <kolga@netapp.com> [colin.king@canonical.com: fix leak in error case] [bfields@fieldses.org: remove signalling, merge patches] Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD OFFLOAD_STATUS xdrOlga Kornievskaia2018-09-251-0/+10
| | | | | Signed-off-by: Olga Kornievskaia <kolga@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD CB_OFFLOAD xdrOlga Kornievskaia2018-09-251-0/+6
| | | | | Signed-off-by: Olga Kornievskaia <kolga@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: fix incorrect umasksJ. Bruce Fields2018-04-031-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We're neglecting to clear the umask after it's set, which can cause a later unrelated rpc to (incorrectly) use the same umask if it happens to be processed by the same thread. There's a more subtle problem here too: An NFSv4 compound request is decoded all in one pass before any operations are executed. Currently we're setting current->fs->umask at the time we decode the compound. In theory a single compound could contain multiple creates each setting a umask. In that case we'd end up using whichever umask was passed in the *last* operation as the umask for all the creates, whether that was correct or not. So, we should just be saving the umask at decode time and waiting to set it until we actually process the corresponding operation. In practice it's unlikely any client would do multiple creates in a single compound. And even if it did they'd likely be from the same process (hence carry the same umask). So this is a little academic, but we should get it right anyway. Fixes: 47057abde515 (nfsd: add support for the umask attribute) Cc: stable@vger.kernel.org Reported-by: Lucash Stach <l.stach@pengutronix.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD: Clean up legacy NFS SYMLINK argument XDR decodersChuck Lever2018-04-031-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | Move common code in NFSD's legacy SYMLINK decoders into a helper. The immediate benefits include: - one fewer data copies on transports that support DDP - consistent error checking across all versions - reduction of code duplication - support for both legal forms of SYMLINK requests on RDMA transports for all versions of NFS (in particular, NFSv2, for completeness) In the long term, this helper is an appropriate spot to perform a per-transport call-out to fill the pathname argument using, say, RDMA Reads. Filling the pathname in the proc function also means that eventually the incoming filehandle can be interpreted so that filesystem- specific memory can be allocated as a sink for the pathname argument, rather than using anonymous pages. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: remove unsused "cp_consecutive" fieldJ. Bruce Fields2018-03-191-1/+0
| | | | Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: fix cached replies to solo SEQUENCE compoundsJ. Bruce Fields2017-11-071-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently our handling of 4.1+ requests without "cachethis" set is confusing and not quite correct. Suppose a client sends a compound consisting of only a single SEQUENCE op, and it matches the seqid in a session slot (so it's a retry), but the previous request with that seqid did not have "cachethis" set. The obvious thing to do might be to return NFS4ERR_RETRY_UNCACHED_REP, but the protocol only allows that to be returned on the op following the SEQUENCE, and there is no such op in this case. The protocol permits us to cache replies even if the client didn't ask us to. And it's easy to do so in the case of solo SEQUENCE compounds. So, when we get a solo SEQUENCE, we can either return the previously cached reply or NFSERR_SEQ_FALSE_RETRY if we notice it differs in some way from the original call. Currently, we're returning a corrupt reply in the case a solo SEQUENCE matches a previous compound with more ops. This actually matters because the Linux client recently started doing this as a way to recover from lost replies to idempotent operations in the case the process doing the original reply was killed: in that case it's difficult to keep the original arguments around to do a real retry, and the client no longer cares what the result is anyway, but it would like to make sure that the slot's sequence id has been incremented, and the solo SEQUENCE assures that: if the server never got the original reply, it will increment the sequence id. If it did get the original reply, it won't increment, and nothing else that about the reply really matters much. But we can at least attempt to return valid xdr! Tested-by: Olga Kornievskaia <aglo@umich.edu> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: Incoming xdr_bufs may have content in tail bufferChuck Lever2017-09-051-0/+1
| | | | | | | | | | | | | | | | | | | | | Since the beginning, svcsock has built a received RPC Call message by populating the xdr_buf's head, then placing the remaining message bytes in the xdr_buf's page list. The xdr_buf's tail is never populated. This means that an NFSv4 COMPOUND containing an NFS WRITE operation plus trailing operations has a page list that contains the WRITE data payload followed by the trailing operations. NFSv4 XDR decoders will not look in the xdr_buf's tail, ever, because svcsock never put anything there. To support transports that can pass the write payload in the xdr_buf's pagelist and trailing content in the xdr_buf's tail, introduce logic in READ_BUF that switches to the xdr_buf's tail vec when the decoder runs out of content in rq_arg.pages. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: skip encoder in trivial error casesJ. Bruce Fields2017-08-241-0/+2
| | | | | | | | | | | | | Most encoders do nothing in the error case. But they can still screw things up in that case: most errors happen very early in rpc processing, possibly before argument fields are filled in and bounds-tested, so encoders that do anything other than immediately bail on error can easily crash in odd error cases. So just handle errors centrally most of the time to remove the chance of error. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: define ->op_release for compound opsJ. Bruce Fields2017-08-241-0/+1
| | | | | | | Run a separate ->op_release function if necessary instead of depending on the xdr encoder to do this. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: opdesc will be useful outside nfs4proc.cJ. Bruce Fields2017-08-241-0/+2
| | | | | | Trivial cleanup, no change in behavior. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: move some nfsd4 op definitions to xdr4.hJ. Bruce Fields2017-08-011-0/+44
| | | | | | I want code in nfs4xdr.c to have access to this stuff. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: properly type op_func callbacksChristoph Hellwig2017-05-151-35/+31
| | | | | | | | | | Pass union nfsd4_op_u to the op_func callbacks instead of using unsafe function pointer casts. It also adds two missing structures to struct nfsd4_op.u to facilitate this. Signed-off-by: Christoph Hellwig <hch@lst.de>
* nfsd4: properly type op_set_currentstateid callbacksChristoph Hellwig2017-05-151-1/+1
| | | | | | | | Given the args union in struct nfsd4_op a name, and pass it to the op_set_currentstateid callbacks instead of using unsafe function pointer casts. Signed-off-by: Christoph Hellwig <hch@lst.de>
* sunrpc: properly type pc_encode callbacksChristoph Hellwig2017-05-151-3/+2
| | | | | | | | | Drop the resp argument as it can trivially be derived from the rqstp argument. With that all functions now have the same prototype, and we can remove the unsafe casting to kxdrproc_t. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
* sunrpc: properly type pc_decode callbacksChristoph Hellwig2017-05-151-2/+1
| | | | | | | | Drop the argp argument as it can trivially be derived from the rqstp argument. With that all functions now have the same prototype, and we can remove the unsafe casting to kxdrproc_t. Signed-off-by: Christoph Hellwig <hch@lst.de>
* sunrpc: properly type pc_release callbacksChristoph Hellwig2017-05-151-1/+1
| | | | | | | | Drop the p and resp arguments as they are always NULL or can trivially be derived from the rqstp argument. With that all functions now have the same prototype, and we can remove the unsafe casting to kxdrproc_t. Signed-off-by: Christoph Hellwig <hch@lst.de>
* NFSD: Implement the COPY callAnna Schumaker2016-10-071-0/+23
| | | | | | | | | I only implemented the sync version of this call, since it's the easiest. I can simply call vfs_copy_range() and have the vfs do the right thing for the filesystem being exported. Signed-off-by: Anna Schumaker <bjschuma@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: implement machine credential support for some operationsAndrew Elble2016-07-131-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | This addresses the conundrum referenced in RFC5661 18.35.3, and will allow clients to return state to the server using the machine credentials. The biggest part of the problem is that we need to allow the client to send a compound op with integrity/privacy on mounts that don't have it enabled. Add server support for properly decoding and using spo_must_enforce and spo_must_allow bits. Add support for machine credentials to be used for CLOSE, OPEN_DOWNGRADE, LOCKU, DELEGRETURN, and TEST/FREE STATEID. Implement a check so as to not throw WRONGSEC errors when these operations are used if integrity/privacy isn't turned on. Without this, Linux clients with credentials that expired while holding delegations were getting stuck in an endless loop. Signed-off-by: Andrew Elble <aweits@rit.edu> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: allow mach_creds_match to be used more broadlyAndrew Elble2016-07-131-0/+2
| | | | | | | | Rename mach_creds_match() to nfsd4_mach_creds_match() and un-staticify Signed-off-by: Andrew Elble <aweits@rit.edu> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: implement the NFSv4.2 CLONE operationChristoph Hellwig2015-12-071-0/+10
| | | | | | | | | | | This is basically a remote version of the btrfs CLONE operation, so the implementation is fairly trivial. Made even more trivial by stealing the XDR code and general framework Anna Schumaker's COPY prototype. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: J. Bruce Fields <bfields@fieldses.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* nfsd: switch unsigned char flags in svc_fh to boolsJeff Layton2015-10-121-1/+1
| | | | | | | ...just for clarity. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: take struct file setup fully into nfs4_preprocess_stateid_opChristoph Hellwig2015-06-221-0/+1
| | | | | | | | | | | | | | | | | This patch changes nfs4_preprocess_stateid_op so it always returns a valid struct file if it has been asked for that. For that we now allocate a temporary struct file for special stateids, and check permissions if we got the file structure from the stateid. This ensures that all callers will get their handling of special stateids right, and avoids code duplication. There is a little wart in here because the read code needs to know if we allocated a file structure so that it can copy around the read-ahead parameters. In the long run we should probably aim to cache full file structures used with special stateids instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: fix pNFS return on close semanticsSachin Bhamare2015-05-041-0/+1
| | | | | | | | | | | | | | | | | | | | | | | For the sake of forgetful clients, the server should return the layouts to the file system on 'last close' of a file (assuming that there are no delegations outstanding to that particular client) or on delegreturn (assuming that there are no opens on a file from that particular client). In theory the information is all there in current data structures, but it's not efficiently available; nfs4_file->fi_ref includes references on the file across all clients, but we need a per-(client, file) count. Walking through lots of stateid's to calculate this on each close or delegreturn would be painful. This patch introduces infrastructure to maintain per-client opens and delegation counters on a per-file basis. [hch: ported to the mainline pNFS support, merged various fixes from Jeff] Signed-off-by: Sachin Bhamare <sachin.bhamare@primarydata.com> Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2015-04-261-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull fourth vfs update from Al Viro: "d_inode() annotations from David Howells (sat in for-next since before the beginning of merge window) + four assorted fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: RCU pathwalk breakage when running into a symlink overmounting something fix I_DIO_WAKEUP definition direct-io: only inc/dec inode->i_dio_count for file systems fs/9p: fix readdir() VFS: assorted d_backing_inode() annotations VFS: fs/inode.c helpers: d_inode() annotations VFS: fs/cachefiles: d_backing_inode() annotations VFS: fs library helpers: d_inode() annotations VFS: assorted weird filesystems: d_inode() annotations VFS: normal filesystems (and lustre): d_inode() annotations VFS: security/: d_inode() annotations VFS: security/: d_backing_inode() annotations VFS: net/: d_inode() annotations VFS: net/unix: d_backing_inode() annotations VFS: kernel/: d_inode() annotations VFS: audit: d_backing_inode() annotations VFS: Fix up some ->d_inode accesses in the chelsio driver VFS: Cachefiles should perform fs modifications on the top layer only VFS: AF_UNIX sockets should call mknod on the top layer only
| * VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells2015-04-151-1/+1
| | | | | | | | | | | | | | that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | nfsd: Remove duplicate macro define for max sec label lengthKinglong Mee2015-03-311-1/+0
| | | | | | | | | | | | | | NFS4_MAXLABELLEN has defined for sec label max length, use it directly. Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* | nfsd: remove unused status arg to nfsd4_cleanup_open_stateJeff Layton2015-03-311-1/+1
|/ | | | | | Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: implement pNFS operationsChristoph Hellwig2015-02-021-0/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the GETDEVICEINFO, LAYOUTGET, LAYOUTCOMMIT and LAYOUTRETURN NFSv4.1 operations, as well as backing code to manage outstanding layouts and devices. Layout management is very straight forward, with a nfs4_layout_stateid structure that extends nfs4_stid to manage layout stateids as the top-level structure. It is linked into the nfs4_file and nfs4_client structures like the other stateids, and contains a linked list of layouts that hang of the stateid. The actual layout operations are implemented in layout drivers that are not part of this commit, but will be added later. The worst part of this commit is the management of the pNFS device IDs, which suffers from a specification that is not sanely implementable due to the fact that the device-IDs are global and not bound to an export, and have a small enough size so that we can't store the fsid portion of a file handle, and must never be reused. As we still do need perform all export authentication and validation checks on a device ID passed to GETDEVICEINFO we are caught between a rock and a hard place. To work around this issue we add a new hash that maps from a 64-bit integer to a fsid so that we can look up the export to authenticate against it, a 32-bit integer as a generation that we can bump when changing the device, and a currently unused 32-bit integer that could be used in the future to handle more than a single device per export. Entries in this hash table are never deleted as we can't reuse the ids anyway, and would have a severe lifetime problem anyway as Linux export structures are temporary structures that can go away under load. Parts of the XDR data, structures and marshaling/unmarshaling code, as well as many concepts are derived from the old pNFS server implementation from Andy Adamson, Benny Halevy, Dean Hildebrand, Marc Eshel, Fred Isaman, Mike Sager, Ricardo Labiaga and many others. Signed-off-by: Christoph Hellwig <hch@lst.de>
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