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authorRicardo Labiaga <Ricardo.Labiaga@netapp.com>2009-09-10 12:27:04 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-09-15 20:52:12 -0400
commit0421b5c55acd0e88920cb9a5bcea6ed738186853 (patch)
treed19e8b22635ba8caa36d9ac1cddf6ab3176c7fb7
parent2af73580b7d7b687175f47ba092640761602b221 (diff)
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nfsd41: Backchannel: Implement cb_recall over NFSv4.1
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> [nfsd41: cb_recall callback] [Share v4.0 and v4.1 back channel xdr] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [Share v4.0 and v4.1 back channel xdr] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: use nfsd4_cb_sequence for callback minorversion] [nfsd41: conditionally decode_sequence in nfs4_xdr_dec_cb_recall] Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: Backchannel: Add sequence arguments to callback RPC arguments] Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> [pulled-in definition of nfsd4_cb_done] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--fs/nfsd/nfs4callback.c53
1 files changed, 48 insertions, 5 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index d37707d26de..89f23eddb8f 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -288,15 +288,19 @@ nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
}
static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
+ struct nfs4_rpc_args *rpc_args)
{
struct xdr_stream xdr;
+ struct nfs4_delegation *args = rpc_args->args_op;
struct nfs4_cb_compound_hdr hdr = {
.ident = args->dl_ident,
+ .minorversion = rpc_args->args_seq.cbs_minorversion,
};
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_cb_compound_hdr(&xdr, &hdr);
+ encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr);
encode_cb_recall(&xdr, args, &hdr);
encode_cb_nops(&hdr);
return 0;
@@ -396,7 +400,8 @@ nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
}
static int
-nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
+nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
+ struct nfsd4_cb_sequence *seq)
{
struct xdr_stream xdr;
struct nfs4_cb_compound_hdr hdr;
@@ -406,6 +411,11 @@ nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
status = decode_cb_compound_hdr(&xdr, &hdr);
if (status)
goto out;
+ if (seq) {
+ status = decode_cb_sequence(&xdr, seq, rqstp);
+ if (status)
+ goto out;
+ }
status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
out:
return status;
@@ -634,11 +644,34 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
rpc_call_start(task);
}
+static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_delegation *dp = calldata;
+ struct nfs4_client *clp = dp->dl_client;
+
+ dprintk("%s: minorversion=%d\n", __func__,
+ clp->cl_cb_conn.cb_minorversion);
+
+ if (clp->cl_cb_conn.cb_minorversion) {
+ /* No need for lock, access serialized in nfsd4_cb_prepare */
+ ++clp->cl_cb_seq_nr;
+ clear_bit(0, &clp->cl_cb_slot_busy);
+ rpc_wake_up_next(&clp->cl_cb_waitq);
+ dprintk("%s: freed slot, new seqid=%d\n", __func__,
+ clp->cl_cb_seq_nr);
+
+ /* We're done looking into the sequence information */
+ task->tk_msg.rpc_resp = NULL;
+ }
+}
+
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
{
struct nfs4_delegation *dp = calldata;
struct nfs4_client *clp = dp->dl_client;
+ nfsd4_cb_done(task, calldata);
+
switch (task->tk_status) {
case -EIO:
/* Network partition? */
@@ -651,16 +684,19 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
break;
default:
/* success, or error we can't handle */
- return;
+ goto done;
}
if (dp->dl_retries--) {
rpc_delay(task, 2*HZ);
task->tk_status = 0;
rpc_restart_call(task);
+ return;
} else {
atomic_set(&clp->cl_cb_conn.cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
}
+done:
+ kfree(task->tk_msg.rpc_argp);
}
static void nfsd4_cb_recall_release(void *calldata)
@@ -686,17 +722,24 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_client;
struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
+ struct nfs4_rpc_args *args;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
- .rpc_argp = dp,
.rpc_cred = callback_cred
};
- int status;
+ int status = -ENOMEM;
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (!args)
+ goto out;
+ args->args_op = dp;
+ msg.rpc_argp = args;
dp->dl_retries = 1;
status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
&nfsd4_cb_recall_ops, dp);
+out:
if (status) {
+ kfree(args);
put_nfs4_client(clp);
nfs4_put_delegation(dp);
}