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authorRicardo Labiaga <Ricardo.Labiaga@netapp.com>2009-09-10 12:26:38 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-09-15 20:49:56 -0400
commit2a1d1b593803d7c18a369bf148f3b48c5a3260fc (patch)
tree40cd8e5498ad680eec740923d512c0bf5fe114b3 /fs/nfsd/nfs4callback.c
parent199ff35e1c8724871e157c2e48556c2794946e82 (diff)
nfsd41: Backchannel: Setup sequence information
Follows the model used by the NFS client. Setup the RPC prepare and done function pointers so that we can populate the sequence information if minorversion == 1. rpc_run_task() is then invoked directly just like existing NFS client operations do. nfsd4_cb_prepare() determines if the sequence information needs to be setup. If the slot is in use, it adds itself to the wait queue. nfsd4_cb_done() wakes anyone sleeping on the callback channel wait queue after our RPC reply has been received. It also sets the task message result pointer to NULL to clearly indicate we're done using it. Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> [define and initialize cl_cb_seq_nr here] [pulled out unused defintion of nfsd4_cb_done] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/nfsd/nfs4callback.c')
-rw-r--r--fs/nfsd/nfs4callback.c62
1 files changed, 62 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,
};