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* nfsd: Fix slot wake up race in the nfsv4.1 callback codeTrond Myklebust2014-11-191-2/+6
| | | | | | | | | | | | | | | | | | | | | | The currect code for nfsd41_cb_get_slot() and nfsd4_cb_done() has no locking in order to guarantee atomicity, and so allows for races of the form. Task 1 Task 2 ====== ====== if (test_and_set_bit(0) != 0) { clear_bit(0) rpc_wake_up_next(queue) rpc_sleep_on(queue) return false; } This patch breaks the race condition by adding a retest of the bit after the call to rpc_sleep_on(). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: eliminate "to_delegation" defineJeff Layton2014-10-011-4/+1
| | | | | | | | | | We now have cb_to_delegation and to_delegation, which do the same thing and are defined separately in different .c files. Move the cb_to_delegation definition into a header file and eliminate the redundant to_delegation definition. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeff Layton <jlayton@primarydata.com>
* nfsd: introduce nfsd4_callback_opsChristoph Hellwig2014-09-261-62/+29
| | | | | | | | Add a higher level abstraction than the rpc_ops for callback operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: split nfsd4_callback initialization and useChristoph Hellwig2014-09-261-8/+6
| | | | | | | | | | | | | Split out initializing the nfs4_callback structure from using it. For the NULL callback this gets rid of tons of pointless re-initializations. Note that I don't quite understand what protects us from running multiple NULL callbacks at the same time, but at least this chance doesn't make it worse.. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: introduce a generic nfsd4_cbChristoph Hellwig2014-09-261-33/+10
| | | | | | | | | | | Add a helper to queue up a callback. CB_NULL has a bit of special casing because it is special in the specification, but all other new callback operations will be able to share code with this and a few more changes to refactor the callback code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: remove nfsd4_callback.cb_opChristoph Hellwig2014-09-261-8/+9
| | | | | | | | | | We can always get at the private data by using container_of, no need for a void pointer. Also introduce a little to_delegation helper to avoid opencoding the container_of everywhere. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: do not clear rpc_resp in nfsd4_cb_done_sequenceBenny Halevy2014-09-261-3/+0
| | | | | | | | | | This is incorrect when a callback is has to be restarted, in which case the XDR decoding of the second iteration will see a NULL cb argument. [hch: updated description] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: fix nfsd4_cb_recall_done error handlingChristoph Hellwig2014-09-261-10/+7
| | | | | | | | | | | | For any error that is not EBADHANDLE or NFS4ERR_BAD_STATEID, nfsd4_cb_recall_done first marks the connection down, then retries until dl_retries hits zero, then marks the connection down again and sets cb_done. This changes the code to only retry for EBADHANDLE or NFS4ERR_BAD_STATEID, and factors setting cb_done into a single point in the function. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: Add a struct nfs4_file field to struct nfs4_stidTrond Myklebust2014-07-311-1/+1
| | | | | | | | | | All stateids are associated with a nfs4_file. Let's consolidate. Replace delegation->dl_file with the dl_stid.sc_file, and nfs4_ol_stateid->st_file with st_stid.sc_file. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: Add reference counting to the lock and open stateidsTrond Myklebust2014-07-311-1/+1
| | | | | | | | | | | | | When we remove the client_mutex, we'll need to be able to ensure that these objects aren't destroyed while we're not holding locks. Add a ->free() callback to the struct nfs4_stid, so that we can release a reference to the stid without caring about the contents. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: remove dl_fh field from struct nfs4_delegationJeff Layton2014-07-291-1/+1
| | | | | | | | | Now that the nfs4_file has a filehandle in it, we no longer need to keep a per-delegation copy of it. Switch to using the one in the nfs4_file instead. Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: convert comma to semicolonHimangi Saraogi2014-07-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Replace a comma between expression statements by a semicolon. This changes the semantics of the code, but given the current indentation appears to be what is intended. A simplified version of the Coccinelle semantic patch that performs this transformation is as follows: // <smpl> @r@ expression e1,e2; @@ e1 -, +; e2; // </smpl> Signed-off-by: Himangi Saraogi <himangi774@gmail.com> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* svcrdma: Select NFSv4.1 backchannel transport based on forward channelChuck Lever2014-07-181-1/+2
| | | | | | | | | | | | | | | | The current code always selects XPRT_TRANSPORT_BC_TCP for the back channel, even when the forward channel was not TCP (eg, RDMA). When a 4.1 mount is attempted with RDMA, the server panics in the TCP BC code when trying to send CB_NULL. Instead, construct the transport protocol number from the forward channel transport or'd with XPRT_TRANSPORT_BC. Transports that do not support bi-directional RPC will not have registered a "BC" transport, causing create_backchannel_client() to fail immediately. Fixes: https://bugzilla.linux-nfs.org/show_bug.cgi?id=265 Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: Avoid taking state_lock while holding inode lock in nfsd_break_one_delegJeff Layton2014-07-171-4/+21
| | | | | | | | | | | | | | | | | | state_lock is a heavily contended global lock. We don't want to grab that while simultaneously holding the inode->i_lock. Add a new per-nfs4_file lock that we can use to protect the per-nfs4_file delegation list. Hold that while walking the list in the break_deleg callback and queue the workqueue job for each one. The workqueue job can then take the state_lock and do the list manipulations without the i_lock being held prior to starting the rpc call. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Jeff Layton <jlayton@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: eliminate nfsd4_init_callbackJeff Layton2014-07-161-6/+2
| | | | | | | | | It's just an obfuscated INIT_WORK call. Just make the work_func_t a non-static symbol and use a normal INIT_WORK call. Signed-off-by: Jeff Layton <jlayton@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: set timeparms.to_maxval in setup_callback_clientJeff Layton2014-04-181-1/+3
| | | | | | | | | ...otherwise the logic in the timeout handling doesn't work correctly. Spotted-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD/SUNRPC: Check rpc_xprt out of xs_setup_bc_tcpKinglong Mee2014-03-301-1/+18
| | | | | | | | Besides checking rpc_xprt out of xs_setup_bc_tcp, increase it's reference (it's important). Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: check backchannel attributes on create_sessionJ. Bruce Fields2013-04-091-24/+1
| | | | | | Make sure the client gives us an adequate backchannel. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: minor cb_recall simplificationJ. Bruce Fields2013-04-041-5/+3
| | | | Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: make NFSv4 lease time per netStanislav Kinsbursky2012-11-281-3/+5
| | | | | | | | Lease time is a part of NFSv4 state engine, which is constructed per network namespace. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: make nfs4_client network namespace dependentStanislav Kinsbursky2012-11-151-1/+1
| | | | | | | And use it's net where possible. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: get_backchannel_cred should be staticFengguang Wu2012-11-141-1/+1
| | | | Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: backchannel should use client-provided security flavorJ. Bruce Fields2012-11-081-2/+1
| | | | | | | For now this only adds support for AUTH_NULL. (Previously we assumed AUTH_UNIX.) We'll also need AUTH_GSS, which is trickier. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: common helper to initialize callback workJ. Bruce Fields2012-11-081-1/+6
| | | | | | | I've found it confusing having the only references to nfsd4_do_callback_rpc() in a different file. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: use callback security parameters in create_sessionJ. Bruce Fields2012-11-081-14/+35
| | | | | | | | | | | | | | | | We're currently ignoring the callback security parameters specified in create_session, and just assuming the client wants auth_sys, because that's all the current linux client happens to care about. But this could cause us callbacks to fail to a client that wanted something different. For now, all we're doing is no longer ignoring the uid and gid passed in the auth_sys case. Further patches will add support for auth_null and gss (and possibly use more of the auth_sys information; the spec wants us to use exactly the credential we're passed, though it's hard to imagine why a client would care). Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: remove duplicate init in nfsd4_cb_recallNamjae Jeon2012-09-101-1/+0
| | | | | | | | remove duplicate init in nfsd4_cb_recall Signed-off-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Vivek Trivedi <vtrivedi018@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: fix security flavor of NFSv4.0 callbackJ. Bruce Fields2012-08-211-2/+2
| | | | | | | | | | | | | | | | | Commit d5497fc693a446ce9100fcf4117c3f795ddfd0d2 "nfsd4: move rq_flavor into svc_cred" forgot to remove cl_flavor from the client, leaving two places (cl_flavor and cl_cred.cr_flavor) for the flavor to be stored. After that patch, the latter was the one that was updated, but the former was the one that the callback used. Symptoms were a long delay on utime(). This is because the utime() generated a setattr which recalled a delegation, but the cb_recall was ignored by the client because it had the wrong security flavor. Cc: stable@vger.kernel.org Tested-by: Jamie Heilman <jamie@audible.transient.net> Reported-by: Jamie Heilman <jamie@audible.transient.net> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: remove unnecessary commentJ. Bruce Fields2012-06-201-1/+0
| | | | | | | | | | | | | For the most part readers of cl_cb_state only need a value that is "eventually" right. And the value is set only either 1) in response to some change of state, in which case it's set to UNKNOWN and then a callback rpc is sent to probe the real state, or b) in the handling of a response to such a callback. UNKNOWN is therefore always a "temporary" state, and for the other states we're happy to accept last writer wins. So I think we're OK here. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: move principal name into svc_credJ. Bruce Fields2012-06-011-2/+3
| | | | | | | | Instead of keeping the principal name associated with a request in a structure that's private to auth_gss and using an accessor function, move it to svc_cred. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: use auth_unix unconditionally on backchannelJ. Bruce Fields2012-03-291-1/+2
| | | | | | | | | | | This isn't actually correct, but it works with the Linux client, and agrees with the behavior we used to have before commit 80fc015bdfe. Later patches will implement the spec-mandated behavior (which is to use the security parameters explicitly given by the client in create_session or backchannel_ctl). Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: convert nfs4_client->cl_cb_flags to a generic flags fieldJeff Layton2012-03-261-7/+7
| | | | | | | | | | | | | | | | | | | We'll need a way to flag the nfs4_client as already being recorded on stable storage so that we don't continually upcall. Currently, that's recorded in the cl_firststate field of the client struct. Using an entire u32 to store a flag is rather wasteful though. The cl_cb_flags field is only using 2 bits right now, so repurpose that to a generic flags field. Rename NFSD4_CLIENT_KILL to NFSD4_CLIENT_CB_KILL to make it evident that it's part of the callback flags. Add a mask that we can use for existing checks that look to see whether any flags are set, so that the new flags don't interfere. Convert all references to cl_firstate to the NFSD4_CLIENT_STABLE flag, and add a new NFSD4_CLIENT_RECLAIM_COMPLETE flag. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* Merge nfs containerization work from Trond's treeJ. Bruce Fields2012-03-261-4/+4
|\ | | | | | | | | The nfs containerization work is a prerequisite for Jeff Layton's reboot recovery rework.
| * SUNRPC: constify the rpc_programTrond Myklebust2012-02-011-3/+3
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * SUNRPC: handle RPC client pipefs dentries by network namespace aware routinesStanislav Kinsbursky2012-02-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | v2: 1) "Over-put" of PipeFS mount point fixed. Fix is ugly, but allows to bisect the patch set. And it will be removed later in the series. This patch makes RPC clients PipeFs dentries allocations in it's owner network namespace context. RPC client pipefs dentries creation logic has been changed: 1) Pipefs dentries creation by sb was moved to separated function, which will be used for handling PipeFS mount notification. 2) Initial value of RPC client PipeFS dir dentry is set no NULL now. RPC client pipefs dentries cleanup logic has been changed: 1) Cleanup is done now in separated rpc_remove_pipedir() function, which takes care about pipefs superblock locking. Also this patch removes slashes from cb_program.pipe_dir_name and from NFS_PIPE_DIRNAME to make rpc_d_lookup_sb() work. This doesn't affect vfs_path_lookup() results in nfs4blocklayout_init() since this slash is cutted off anyway in link_path_walk(). Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* | nfsd4: make sure set CB_PATH_DOWN sequence flag setJ. Bruce Fields2012-03-091-1/+1
|/ | | | | | | | | | | | Make sure this is set whenever there is no callback channel. If a client does not set up a callback channel at all, then it will get this flag set from the very start. That's OK, it can just ignore the flag if it doesn't care. If a client does care, I think it's better to inform it of the problem as early as possible. Reported-by: Rick Macklem <rmacklem@uoguelph.ca> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* SUNRPC: Clean up the RPCSEC_GSS service ticket requestsTrond Myklebust2012-01-051-1/+1
| | | | | | | | Instead of hacking specific service names into gss_encode_v1_msg, we should just allow the caller to specify the service name explicitly. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: J. Bruce Fields <bfields@redhat.com>
* nfsd41: use SEQ4_STATUS_BACKCHANNEL_FAULT when cb_sequence is invalidBenny Halevy2011-10-241-0/+10
| | | | | Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: move client * to nfs4_stateid, add init_stid helperJ. Bruce Fields2011-09-261-4/+4
| | | | | | This will be convenient. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: add common dl_stid field to delegationJ. Bruce Fields2011-09-141-1/+1
| | | | Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD: fix decode_cb_sequence4resokBenny Halevy2011-02-231-1/+1
| | | | | | | | | | | | Fix bug introduced in patch 85a56480 NFSD: Update XDR decoders in NFSv4 callback client Although decode_cb_sequence4resok ignores highest slotid and target highest slotid it must account for their space in their xdr stream when calling xdr_inline_decode Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* NFSD: use nfserr for status after decode_cb_op_statusBenny Halevy2011-02-141-4/+2
| | | | | | | | | Bugs introduced in 85a56480191ca9f08fc775c129b9eb5c8c1f2c05 "NFSD: Update XDR decoders in NFSv4 callback client" Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* Merge branch 'for-2.6.38' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2011-01-141-52/+99
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-2.6.38' of git://linux-nfs.org/~bfields/linux: (62 commits) nfsd4: fix callback restarting nfsd: break lease on unlink, link, and rename nfsd4: break lease on nfsd setattr nfsd: don't support msnfs export option nfsd4: initialize cb_per_client nfsd4: allow restarting callbacks nfsd4: simplify nfsd4_cb_prepare nfsd4: give out delegations more quickly in 4.1 case nfsd4: add helper function to run callbacks nfsd4: make sure sequence flags are set after destroy_session nfsd4: re-probe callback on connection loss nfsd4: set sequence flag when backchannel is down nfsd4: keep finer-grained callback status rpc: allow xprt_class->setup to return a preexisting xprt rpc: keep backchannel xprt as long as server connection rpc: move sk_bc_xprt to svc_xprt nfsd4: allow backchannel recovery nfsd4: support BIND_CONN_TO_SESSION nfsd4: modify session list under cl_lock Documentation: fl_mylease no longer exists ... Fix up conflicts in fs/nfsd/vfs.c with the vfs-scale work. The vfs-scale work touched some msnfs cases, and this merge removes support for that entirely, so the conflict was trivial to resolve.
| * nfsd4: fix callback restartingJ. Bruce Fields2011-01-141-12/+9
| | | | | | | | | | | | | | Ensure a new callback is added to the client's list of callbacks at most once. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: initialize cb_per_clientJ. Bruce Fields2011-01-141-0/+1
| | | | | | | | | | | | | | Otherwise a callback that is aborted before it runs will result in a list_del on an uninitialized list head. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: allow restarting callbacksJ. Bruce Fields2011-01-111-6/+28
| | | | | | | | | | | | | | | | | | | | If we lose the backchannel and then the client repairs the problem, resend any callbacks. We use a new cb_done flag to track whether there is still work to be done for the callback or whether it can be destroyed with the rpc. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: simplify nfsd4_cb_prepareJ. Bruce Fields2011-01-111-22/+4
| | | | | | | | | | | | Remove handling for a nonexistant case (status && !-EAGAIN). Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: add helper function to run callbacksJ. Bruce Fields2011-01-111-2/+7
| | | | | | | | Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: make sure sequence flags are set after destroy_sessionJ. Bruce Fields2011-01-111-0/+6
| | | | | | | | | | | | | | If this loses any backchannel, make sure we have a chance to notice that and set the sequence flags. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: keep finer-grained callback statusJ. Bruce Fields2011-01-111-12/+14
| | | | | | | | | | | | | | | | | | Distinguish between when the callback channel is known to be down, and when it is not yet confirmed. This will be useful in the 4.1 case. Also, we don't seem to be using the fact that this field is atomic. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * nfsd4: allow backchannel recoveryJ. Bruce Fields2011-01-111-3/+33
| | | | | | | | | | | | | | | | | | Now that we have a list of connections to choose from, we can teach the callback code to just pick a suitable connection and use that, instead of insisting on forever using the connection that the first create_session was sent with. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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