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path: root/fs/nfsd/nfs4callback.c
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2017-07-17nfsd: Fix a memory scribble in the callback channelTrond Myklebust
The offset of the entry in struct rpc_version has to match the version number. Reported-by: Dave Jones <davej@codemonkey.org.uk> Fixes: 1c5876ddbdb4 ("sunrpc: move p_count out of struct rpc_procinfo") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Reported-by: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-05-15nfsd4: const-ify nfs_cb_version4Christoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de>
2017-05-15sunrpc: mark all struct rpc_procinfo instances as constChristoph Hellwig
struct rpc_procinfo contains function pointers, and marking it as constant avoids it being able to be used as an attach vector for code injections. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-05-15sunrpc: move p_count out of struct rpc_procinfoChristoph Hellwig
p_count is the only writeable memeber of struct rpc_procinfo, which is a good candidate to be const-ified as it contains function pointers. This patch moves it into out out struct rpc_procinfo, and into a separate writable array that is pointed to by struct rpc_version and indexed by p_statidx. Signed-off-by: Christoph Hellwig <hch@lst.de>
2017-05-15nfsd: fix decoder callback prototypesChristoph Hellwig
Declare the p_decode callbacks with the proper prototype instead of casting to kxdrdproc_t and losing all type safety. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@redhat.com>
2017-05-15nfsd: fix encoder callback prototypesChristoph Hellwig
Declare the p_encode callbacks with the proper prototype instead of casting to kxdreproc_t and losing all type safety. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@redhat.com>
2017-02-17nfsd/callback: Drop a useless data copy when comparing sessionidKinglong Mee
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-17nfsd/callback: skip the callback tagKinglong Mee
The callback tag is NULL, and hdr->nops is unused too right now, but. But if we were to ever test with a nonzero callback tag, nops will get a bad value. Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-17nfsd/callback: Cleanup callback cred on shutdownKinglong Mee
The rpccred gotten from rpc_lookup_machine_cred() should be put when state is shutdown. Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-14nfsd: update workqueue creationJ. Bruce Fields
No real change in functionality, but the old interface seems to be deprecated. We don't actually care about ordering necessarily, but we do depend on running at most one work item at a time: nfsd4_process_cb_update() assumes that no other thread is running it, and that no new callbacks are starting while it's running. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-09-26nfsd: plumb in a CB_NOTIFY_LOCK operationJeff Layton
Add the encoding/decoding for CB_NOTIFY_LOCK operations. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-09-16nfsd: eliminate cb_minorversion fieldJeff Layton
We already have that info in the client pointer. No need to pass around a copy. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-06-15nfsd4/rpc: move backchannel create logic into rpc codeJ. Bruce Fields
Also simplify the logic a bit. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com> Acked-by: Trond Myklebust <trondmy@primarydata.com>
2015-12-23nfsd: don't base cl_cb_status on stale informationJ. Bruce Fields
The rpc client we use to send callbacks may change occasionally. (In the 4.0 case, the client can use setclientid/setclientid_confirm to update the callback parameters. In the 4.1+ case, sessions and connections can come and go.) The update is done from the callback thread by nfsd4_process_cb_update, which shuts down the old rpc client and then creates a new one. The client shutdown kills any ongoing rpc calls. There won't be any new ones till the new one's created and the callback thread moves on. When an rpc encounters a problem that may suggest callback rpc's aren't working any longer, it normally sets NFSD4_CB_DOWN, so the server can tell the client something's wrong. But if the rpc notices CB_UPDATE is set, then the failure may just be a normal result of shutting down the callback client. Or it could just be a coincidence, but in any case, it means we're runing with the old about-to-be-discarded client, so the failure's not interesting. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-11-23nfsd: constify nfsd4_callback_ops structureJulia Lawall
The nfsd4_callback_ops structure is never modified, so declare it as const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-08-13nfsd: New helper nfsd4_cb_sequence_done() for processing more cb errorsKinglong Mee
According to Christoph's advice, this patch introduce a new helper nfsd4_cb_sequence_done() for processing more callback errors, following the example of the client's nfs41_sequence_done(). Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-06-04nfsd: Update callback sequnce id only CB_SEQUENCE successKinglong Mee
When testing pnfs layout, nfsd got error NFS4ERR_SEQ_MISORDERED. It is caused by nfs return NFS4ERR_DELAY before validate_seqid(), don't update the sequnce id, but nfsd updates the sequnce id !!! According to RFC5661 20.9.3, " If CB_SEQUENCE returns an error, then the state of the slot (sequence ID, cached reply) MUST NOT change. " Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-06-04nfsd: Reset cb_status in nfsd4_cb_prepare() at retryingKinglong Mee
nfsd enters a infinite loop and prints message every 10 seconds: May 31 18:33:52 test-server kernel: Error sending entire callback! May 31 18:34:01 test-server kernel: Error sending entire callback! This is caused by a cb_layoutreturn getting error -10008 (NFS4ERR_DELAY), the client crashing, and then nfsd entering the infinite loop: bc_sendto --> call_timeout --> nfsd4_cb_done --> nfsd4_cb_layout_done with error -10008 --> rpc_delay(task, HZ/100) --> bc_sendto ... Reproduced using xfstests 074 with nfs client's kdump on, CONFIG_DEFAULT_HUNG_TASK_TIMEOUT set, and client's blkmapd down: 1. nfs client's write operation will get the layout of file, and then send getdeviceinfo, 2. but layout segment is not recorded by client because blkmapd is down, 3. client writes data by sending WRITE to server, 4. nfs server recalls the layout of the file before WRITE, 5. network error causes the client reset the session and return NFS4ERR_DELAY, 6. so client's WRITE operation is waiting the reply. If the task hangs 120s, the client will crash. 7. so that, the next bc_sendto will fail with TIMEOUT, and cb_status is NFS4ERR_DELAY. Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-05-04nfsd: skip CB_NULL probes for 4.1 or laterChristoph Hellwig
With sessions in v4.1 or later we don't need to manually probe the backchannel connection, so we can declare it up instantly after setting up the RPC client. Note that we really should split nfsd4_run_cb_work in the long run, this is just the least intrusive fix for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-05-04nfsd: fix callback restartsChristoph Hellwig
Checking the rpc_client pointer is not a reliable way to detect backchannel changes: cl_cb_client is changed only after shutting down the rpc client, so the condition cl_cb_client = tk_client will always be true. Check the RPC_TASK_KILLED flag instead, and rewrite the code to avoid the buggy cl_callbacks list and fix the lifetime rules due to double calls of the ->prepare callback operations method for this retry case. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-05-04nfsd: split transport vs operation errors for callbacksChristoph Hellwig
We must only increment the sequence id if the client has seen and responded to a request. If we failed to deliver it to the client we must resend with the same sequence id. So just like the client track errors at the transport level differently from those returned in the XDR. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-02-02nfsd: implement pNFS layout recallsChristoph Hellwig
Add support to issue layout recalls to clients. For now we only support full-file recalls to get a simple and stable implementation. This allows to embedd a nfsd4_callback structure in the layout_state and thus avoid any memory allocations under spinlocks during a recall. For normal use cases that do not intent to share a single file between multiple clients this implementation is fully sufficient. To ensure layouts are recalled on local filesystem access each layout state registers a new FL_LAYOUT lease with the kernel file locking code, which filesystems that support pNFS exports that require recalls need to break on conflicting access patterns. The XDR code is based on the old pNFS server implementation by Andy Adamson, Benny Halevy, Boaz Harrosh, Dean Hildebrand, Fred Isaman, Marc Eshel, Mike Sager and Ricardo Labiaga. Signed-off-by: Christoph Hellwig <hch@lst.de>
2014-11-19nfsd: Fix slot wake up race in the nfsv4.1 callback codeTrond Myklebust
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>
2014-10-01nfsd: eliminate "to_delegation" defineJeff Layton
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>
2014-09-26nfsd: introduce nfsd4_callback_opsChristoph Hellwig
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>
2014-09-26nfsd: split nfsd4_callback initialization and useChristoph Hellwig
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>
2014-09-26nfsd: introduce a generic nfsd4_cbChristoph Hellwig
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>
2014-09-26nfsd: remove nfsd4_callback.cb_opChristoph Hellwig
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>
2014-09-26nfsd: do not clear rpc_resp in nfsd4_cb_done_sequenceBenny Halevy
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>
2014-09-26nfsd: fix nfsd4_cb_recall_done error handlingChristoph Hellwig
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>
2014-07-31nfsd: Add a struct nfs4_file field to struct nfs4_stidTrond Myklebust
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>
2014-07-31nfsd: Add reference counting to the lock and open stateidsTrond Myklebust
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>
2014-07-29nfsd: remove dl_fh field from struct nfs4_delegationJeff Layton
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>
2014-07-23nfsd4: convert comma to semicolonHimangi Saraogi
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>
2014-07-18svcrdma: Select NFSv4.1 backchannel transport based on forward channelChuck Lever
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>
2014-07-16nfsd: Avoid taking state_lock while holding inode lock in nfsd_break_one_delegJeff Layton
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>
2014-07-16nfsd: eliminate nfsd4_init_callbackJeff Layton
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>
2014-04-18nfsd: set timeparms.to_maxval in setup_callback_clientJeff Layton
...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>
2014-03-30NFSD/SUNRPC: Check rpc_xprt out of xs_setup_bc_tcpKinglong Mee
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>
2013-04-09nfsd4: check backchannel attributes on create_sessionJ. Bruce Fields
Make sure the client gives us an adequate backchannel. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-04-04nfsd4: minor cb_recall simplificationJ. Bruce Fields
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-11-28nfsd: make NFSv4 lease time per netStanislav Kinsbursky
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>
2012-11-15nfsd: make nfs4_client network namespace dependentStanislav Kinsbursky
And use it's net where possible. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-11-14nfsd4: get_backchannel_cred should be staticFengguang Wu
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-11-07nfsd4: backchannel should use client-provided security flavorJ. Bruce Fields
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>
2012-11-07nfsd4: common helper to initialize callback workJ. Bruce Fields
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>
2012-11-07nfsd4: use callback security parameters in create_sessionJ. Bruce Fields
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>
2012-09-10nfsd: remove duplicate init in nfsd4_cb_recallNamjae Jeon
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>
2012-08-20nfsd4: fix security flavor of NFSv4.0 callbackJ. Bruce Fields
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>
2012-06-20nfsd4: remove unnecessary commentJ. Bruce Fields
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>
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