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* Merge branch 'for-2.6.26' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2008-05-20
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-2.6.26' of git://linux-nfs.org/~bfields/linux: (25 commits) svcrdma: Verify read-list fits within RPCSVC_MAXPAGES svcrdma: Change svc_rdma_send_error return type to void svcrdma: Copy transport address and arm CQ before calling rdma_accept svcrdma: Set rqstp transport address in rdma_read_complete function svcrdma: Use ib verbs version of dma_unmap svcrdma: Cleanup queued, but unprocessed I/O in svc_rdma_free svcrdma: Move the QP and cm_id destruction to svc_rdma_free svcrdma: Add reference for each SQ/RQ WR svcrdma: Move destroy to kernel thread svcrdma: Shrink scope of spinlock on RQ CQ svcrdma: Use standard Linux lists for context cache svcrdma: Simplify RDMA_READ deferral buffer management svcrdma: Remove unused READ_DONE context flags bit svcrdma: Return error from rdma_read_xdr so caller knows to free context svcrdma: Fix error handling during listening endpoint creation svcrdma: Free context on post_recv error in send_reply svcrdma: Free context on ib_post_recv error svcrdma: Add put of connection ESTABLISHED reference in rdma_cma_handler svcrdma: Fix return value in svc_rdma_send svcrdma: Fix race with dto_tasklet in svc_rdma_send ...
| * Merge branch 'from-tomtucker' into for-2.6.26J. Bruce Fields2008-05-20
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| | * svcrdma: Verify read-list fits within RPCSVC_MAXPAGESTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | A RDMA read-list cannot contain more elements than RPCSVC_MAXPAGES or it will overflow the DTO context. Verify this when processing the protocol header. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Change svc_rdma_send_error return type to voidTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | The svc_rdma_send_error function is called when an RPCRDMA protocol error is detected. This function attempts to post an error reply message. Since an error posting to a transport in error is ignored, change the return type to void. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Copy transport address and arm CQ before calling rdma_acceptTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This race was found by inspection. Messages can be received from the peer immediately following the rdma_accept call, however, the CQ have not yet been armed and the transport address has not yet been set. Set the transport address in the connect request handler and arm the CQ prior to calling rdma_accept. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Set rqstp transport address in rdma_read_complete functionTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | The rdma_read_complete function needs to copy the rqstp transport address from the transport. Failure to do so can result in using the wrong authentication method for the RPC or bug checking if the rqstp address is not valid. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Use ib verbs version of dma_unmapTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | Use the ib_verbs version of the dma_unmap service in the svc_rdma_put_context function. This should support providers using software rdma. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Cleanup queued, but unprocessed I/O in svc_rdma_freeTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | When the transport is closing, the DTO tasklet may queue data that never gets processed. Clean up resources associated with this I/O. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Move the QP and cm_id destruction to svc_rdma_freeTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move the destruction of the QP and CM_ID to the free path so that the QP cleanup code doesn't race with the dto_tasklet handling flushed WR. The QP reference is not needed because we now have a reference for every WR. Also add a guard in the SQ and RQ completion handlers to ignore calls generated by some providers when the QP is destroyed. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Add reference for each SQ/RQ WRTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | Add a reference on the transport for every outstanding WR. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Move destroy to kernel threadTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | Some providers may wait while destroying adapter resources. Since it is possible that the last reference is put on the dto_tasklet, the actual destroy must be scheduled as a work item. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Shrink scope of spinlock on RQ CQTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | The rq_cq_reap function is only called from the dto_tasklet. The only resource shared with other threads is the sc_rq_dto_q. Move the spin lock to protect only this list. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Use standard Linux lists for context cacheTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | Replace the one-off linked list implementation used to implement the context cache with the standard Linux list_head lists. Add a context counter to catch resource leaks. A WARN_ON will be added later to ensure that we've freed all contexts. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Simplify RDMA_READ deferral buffer managementTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | An NFS_WRITE requires a set of RDMA_READ requests to fetch the write data from the client. There are two principal pieces of data that need to be tracked: the list of pages that comprise the completed RPC and the SGE of dma mapped pages to refer to this list of pages. Previously this whole bit was managed as a linked list of contexts with the context containing the page list buried in this list. This patch simplifies this processing by not keeping a linked list, but rather only a pionter from the last submitted RDMA_READ's context to the context that maps the set of pages that describe the RPC. This significantly simplifies this code path. SGE contexts are cleaned up inline in the DTO path instead of at read completion time. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Remove unused READ_DONE context flags bitTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | The RDMACTXT_F_READ_DONE bit is not longer used. Remove it. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Return error from rdma_read_xdr so caller knows to free contextTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | The rdma_read_xdr function did not discriminate between no read-list and an error posting the read-list. This results in a leak of a page if there is an error posting the read-list. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Fix error handling during listening endpoint creationTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | A listening endpoint isn't known to the generic transport switch until the svc_create_xprt function returns without error. Calling svc_xprt_put within the xpo_create function causes the module reference count to be erroneously decremented. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Free context on post_recv error in send_replyTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | If an error is encountered trying to post a recv buffer in send_reply, free the passed in context. Return an error to the caller so it is aware that the request was not posted. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Free context on ib_post_recv errorTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | If there is an error posting the recv WR to the RQ, free the context associated with the WR. This would leak a context when asynchronous errors occurred on the transport while conccurent threads were processing their RPC. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Add put of connection ESTABLISHED reference in rdma_cma_handlerTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The svcrdma transport takes a reference when it gets the ESTABLISHED event from the provider. This reference is supposed to be removed when the DISCONNECT event is received, however, the call to svc_xprt_put was missing in the switch statement. This results in the memory associated with the transport never being freed. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Fix return value in svc_rdma_sendTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | Fix the return value on close to -ENOTCONN so caller knows to free context. Also if a thread is waiting for free SQ space, check for close when waking to avoid posting WR to a closing transport. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Fix race with dto_tasklet in svc_rdma_sendTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The svc_rdma_send function will attempt to reap SQ WR to make room for a new request if it finds the SQ full. This function races with the dto_tasklet that also reaps SQ WR. To avoid polling and arming the CQ unnecessarily move the test_and_clear_bit of the RDMAXPRT_SQ_PENDING flag and arming of the CQ to the sq_cq_reap function. Refactor the rq_cq_reap function to match sq_cq_reap so that the code is easier to follow. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svcrdma: Simplify receive buffer postingTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The svcrdma transport provider currently allocates receive buffers to the RQ through the xpo_release_rqst method. This approach is overly complicated since it means that the rqstp rq_xprt_ctxt has to be selectively set based on whether the RPC is going to be processed immediately or deferred. Instead, just post the receive buffer when we are certain that we are replying in the send_reply function. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svc: Remove unused header files from svc_xprt.cTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | This cosmetic patch removes unused header files that svc_xprt.c inherited from svcsock.c Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| | * svc: Remove extra check for XPT_DEAD bit in svc_xprt_enqueueTom Tucker2008-05-19
| | | | | | | | | | | | | | | | | | | | | | | | Remove a redundant check for the XPT_DEAD bit in the svc_xprt_enqueue function. This same bit is checked below while holding the pool lock and prints a debug message if found to be dead. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
| * | svcrpc: fix proc/net/rpc/auth.unix.ip/content displayJ. Bruce Fields2008-05-18
| |/ | | | | | | | | | | | | | | | | | | | | Commit f15364bd4cf8799a7677b6daeed7b67d9139d974 ("IPv6 support for NFS server export caches") dropped a couple spaces, rendering the output here difficult to read. (However note that we expect the output to be parsed only by humans, not machines, so this shouldn't have broken any userland software.) Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* / SUNRPC: AUTH_SYS "machine creds" shouldn't use negative valued uid/gidTrond Myklebust2008-05-18
|/ | | | | | | | Apparently this causes Solaris 10 servers to refuse our NFSv4 SETCLIENTID calls. Fall back to root creds for now, since most servers that care are very likely to have root squashing enabled. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* Remove duplicated include in net/sunrpc/svc.cHuang Weiyi2008-05-08
| | | | | | | <linux/sched.h> we included twice. Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sunrpc: assign PDE->data before gluing PDE into /proc treeDenis V. Lunev2008-05-02
| | | | | | | Simply replace proc_create and further data assigned with proc_create_data. Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds2008-04-28
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: iwlwifi: Allow building iwl3945 without iwl4965. wireless: Fix compile error with wifi & leds tcp: Fix slab corruption with ipv6 and tcp6fuzz ipv4/ipv6 compat: Fix SSM applications on 64bit kernels. [IPSEC]: Use digest_null directly for auth sunrpc: fix missing kernel-doc can: Fix copy_from_user() results interpretation Revert "ipv6: Fix typo in net/ipv6/Kconfig" tipc: endianness annotations ipv6: result of csum_fold() is already 16bit, no need to cast [XFRM] AUDIT: Fix flowlabel text format ambibuity.
| * sunrpc: fix missing kernel-docRandy Dunlap2008-04-27
| | | | | | | | | | | | | | | | | | Fix missing sunrpc kernel-doc: Warning(linux-2.6.25-git7//net/sunrpc/xprt.c:451): No description found for parameter 'action' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.linux-nfs.org/projects/trondmy/nfs-2.6Linus Torvalds2008-04-24
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (80 commits) SUNRPC: Invalidate the RPCSEC_GSS session if the server dropped the request make nfs_automount_list static NFS: remove duplicate flags assignment from nfs_validate_mount_data NFS - fix potential NULL pointer dereference v2 SUNRPC: Don't change the RPCSEC_GSS context on a credential that is in use SUNRPC: Fix a race in gss_refresh_upcall() SUNRPC: Don't disconnect more than once if retransmitting NFSv4 requests SUNRPC: Remove the unused export of xprt_force_disconnect SUNRPC: remove XS_SENDMSG_RETRY SUNRPC: Protect creds against early garbage collection NFSv4: Attempt to use machine credentials in SETCLIENTID calls NFSv4: Reintroduce machine creds NFSv4: Don't use cred->cr_ops->cr_name in nfs4_proc_setclientid() nfs: fix printout of multiword bitfields nfs: return negative error value from nfs{,4}_stat_to_errno NLM/lockd: Ensure client locking calls use correct credentials NFS: Remove the buggy lock-if-signalled case from do_setlk() NLM/lockd: Fix a race when cancelling a blocking lock NLM/lockd: Ensure that nlmclnt_cancel() returns results of the CANCEL call NLM: Remove the signal masking in nlmclnt_proc/nlmclnt_cancel ...
| * \ Merge branch 'devel'Trond Myklebust2008-04-24
| |\ \
| | * | SUNRPC: Invalidate the RPCSEC_GSS session if the server dropped the requestTrond Myklebust2008-04-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RFC 2203 requires the server to drop the request if it believes the RPCSEC_GSS context is out of sequence. The problem is that we have no way on the client to know why the server dropped the request. In order to avoid spinning forever trying to resend the request, the safe approach is therefore to always invalidate the RPCSEC_GSS context on every major timeout. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Don't change the RPCSEC_GSS context on a credential that is in useTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a server rejects our credential with an AUTH_REJECTEDCRED or similar, we need to refresh the credential and then retry the request. However, we do want to allow any requests that are in flight to finish executing, so that we can at least attempt to process the replies that depend on this instance of the credential. The solution is to ensure that gss_refresh() looks up an entirely new RPCSEC_GSS credential instead of attempting to create a context for the existing invalid credential. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Fix a race in gss_refresh_upcall()Trond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | If the downcall completes before we get the spin_lock then we currently fail to refresh the credential. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Don't disconnect more than once if retransmitting NFSv4 requestsTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NFSv4 requires us to ensure that we break the TCP connection before we're allowed to retransmit a request. However in the case where we're retransmitting several requests that have been sent on the same connection, we need to ensure that we don't interfere with the attempt to reconnect and/or break the connection again once it has been established. We therefore introduce a 'connection' cookie that is bumped every time a connection is broken. This allows requests to track if they need to force a disconnection. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Remove the unused export of xprt_force_disconnectTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: remove XS_SENDMSG_RETRYTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The condition for exiting from the loop in xs_tcp_send_request() should be that we find we're not making progress (i.e. number of bytes sent is 0). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Protect creds against early garbage collectionTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | NFSv4: Reintroduce machine credsTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to try to ensure that we always use the same credentials whenever we re-establish the clientid on the server. If not, the server won't recognise that we're the same client, and so may not allow us to recover state. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | NFSv4: Don't use cred->cr_ops->cr_name in nfs4_proc_setclientid()Trond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the recent change to generic creds, we can no longer use cred->cr_ops->cr_name to distinguish between RPCSEC_GSS principals and AUTH_SYS/AUTH_NULL identities. Replace it with the rpc_authops->au_name instead... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Fix read ordering problems with req->rq_private_buf.lenTrond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We want to ensure that req->rq_private_buf.len is updated before req->rq_received, so that call_decode() doesn't use an old value for req->rq_rcv_buf.len. In 'call_decode()' itself, instead of using task->tk_status (which is set using req->rq_received) must use the actual value of req->rq_private_buf.len when deciding whether or not the received RPC reply is too short. Finally ensure that we set req->rq_rcv_buf.len to zero when retrying a request. A typo meant that we were resetting req->rq_private_buf.len in call_decode(), and then clobbering that value with the old rq_rcv_buf.len again in xprt_transmit(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Don't attempt to destroy expired RPCSEC_GSS credentials..Trond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ..and always destroy using a 'soft' RPC call. Destroying GSS credentials isn't mandatory; the server can always cope with a few credentials not getting destroyed in a timely fashion. This actually fixes a hang situation. Basically, some servers will decide that the client is crazy if it tries to destroy an RPC context for which they have sent an RPCSEC_GSS_CREDPROBLEM, and so will refuse to talk to it for a while. The regression therefor probably was introduced by commit 0df7fb74fbb709591301871a38aac7735a1d6583. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Fix up xprt_write_space()Trond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rest of the networking layer uses SOCK_ASYNC_NOSPACE to signal whether or not we have someone waiting for buffer memory. Convert the SUNRPC layer to use the same idiom. Remove the unlikely()s in xs_udp_write_space and xs_tcp_write_space. In fact, the most common case will be that there is nobody waiting for buffer space. SOCK_NOSPACE is there to tell the TCP layer whether or not the cwnd was limited by the application window. Ensure that we follow the same idiom as the rest of the networking layer here too. Finally, ensure that we clear SOCK_ASYNC_NOSPACE once we wake up, so that write_space() doesn't keep waking things up on xprt->pending. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | SUNRPC: Fix a bug in call_decode()Trond Myklebust2008-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | call_verify() can, under certain circumstances, free the RPC slot. In that case, our cached pointer 'req = task->tk_rqstp' is invalid. Bug was introduced in commit 220bcc2afd7011b3e0569fc178331fa983c92c1b (SUNRPC: Don't call xprt_release in call refresh). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | Merge branch 'hotfixes' into develTrond Myklebust2008-03-19
| | |\ \
| | * | | SUNRPC: Add a helper rpcauth_lookup_generic_cred()Trond Myklebust2008-03-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The NFSv4 protocol allows clients to negotiate security protocols on the fly in the case where an administrator on the server changes the export settings and/or in the case where we may have a filesystem migration event. Instead of having the NFS client code cache credentials that are tied to a particular AUTH method it is therefore preferable to have a generic credential that can be converted into whatever AUTH is in use by the RPC client when the read/write/sillyrename/... is put on the wire. We do this by means of the new "generic" credential, which basically just caches the minimal information that is needed to look up an RPCSEC_GSS, AUTH_SYS, or AUTH_NULL credential. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | | SUNRPC: Add an rpc_credop callback for binding a credential to an rpc_taskTrond Myklebust2008-03-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need the ability to treat 'generic' creds specially, since they want to bind instances of the auth cred instead of binding themselves. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * | | SUNRPC: Add a generic RPC credentialTrond Myklebust2008-03-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add an rpc credential that is not tied to any particular auth mechanism, but that can be cached by NFS, and later used to look up a cred for whichever auth mechanism that turns out to be valid when the RPC call is being made. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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