diff options
| -rw-r--r-- | fs/nfsd/nfs4callback.c | 62 | ||||
| -rw-r--r-- | fs/nfsd/nfs4state.c | 1 | ||||
| -rw-r--r-- | include/linux/nfsd/state.h | 1 |
3 files changed, 64 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index f31175717c1..25a09069e45 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -501,6 +501,67 @@ nfsd4_probe_callback(struct nfs4_client *clp) do_probe_callback(clp); } +/* + * There's currently a single callback channel slot. + * If the slot is available, then mark it busy. Otherwise, set the + * thread for sleeping on the callback RPC wait queue. + */ +static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, + struct rpc_task *task) +{ + struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; + u32 *ptr = (u32 *)clp->cl_sessionid.data; + int status = 0; + + dprintk("%s: %u:%u:%u:%u\n", __func__, + ptr[0], ptr[1], ptr[2], ptr[3]); + + if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { + rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); + dprintk("%s slot is busy\n", __func__); + status = -EAGAIN; + goto out; + } + + /* + * We'll need the clp during XDR encoding and decoding, + * and the sequence during decoding to verify the reply + */ + args->args_seq.cbs_clp = clp; + task->tk_msg.rpc_resp = &args->args_seq; + +out: + dprintk("%s status=%d\n", __func__, status); + return status; +} + +/* + * TODO: cb_sequence should support referring call lists, cachethis, multiple + * slots, and mark callback channel down on communication errors. + */ +static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) +{ + struct nfs4_delegation *dp = calldata; + struct nfs4_client *clp = dp->dl_client; + struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; + u32 minorversion = clp->cl_cb_conn.cb_minorversion; + int status = 0; + + args->args_seq.cbs_minorversion = minorversion; + if (minorversion) { + status = nfsd41_cb_setup_sequence(clp, task); + if (status) { + if (status != -EAGAIN) { + /* terminate rpc task */ + task->tk_status = status; + task->tk_action = NULL; + } + return; + } + } + rpc_call_start(task); +} + static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) { struct nfs4_delegation *dp = calldata; @@ -540,6 +601,7 @@ static void nfsd4_cb_recall_release(void *calldata) } static const struct rpc_call_ops nfsd4_cb_recall_ops = { + .rpc_call_prepare = nfsd4_cb_prepare, .rpc_call_done = nfsd4_cb_recall_done, .rpc_release = nfsd4_cb_recall_release, }; diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index f4cebd9016b..76b7bcbb3f2 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1331,6 +1331,7 @@ nfsd4_create_session(struct svc_rqst *rqstp, unconf->cl_cb_conn.cb_minorversion = cstate->minorversion; unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog; + unconf->cl_cb_seq_nr = 1; nfsd4_probe_callback(unconf); } conf = unconf; diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h index 9cc40a137c3..b38d1132418 100644 --- a/include/linux/nfsd/state.h +++ b/include/linux/nfsd/state.h @@ -221,6 +221,7 @@ struct nfs4_client { /* for nfs41 callbacks */ /* We currently support a single back channel with a single slot */ unsigned long cl_cb_slot_busy; + u32 cl_cb_seq_nr; struct svc_xprt *cl_cb_xprt; /* 4.1 callback transport */ struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */ /* wait here for slots */ |