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svcrdma: Select NFSv4.1 backchannel transport based on forward channel

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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>
This commit is contained in:
Chuck Lever 2014-07-16 15:38:32 -04:00 committed by J. Bruce Fields
parent 5d6031ca74
commit 3c45ddf823
5 changed files with 7 additions and 2 deletions
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3
fs/nfsd/nfs4callback.c
View File

@ -689,7 +689,8 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
clp->cl_cb_session = ses;
args.bc_xprt = conn->cb_xprt;
args.prognumber = clp->cl_cb_session->se_cb_prog;
args.protocol = XPRT_TRANSPORT_BC_TCP;
args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
XPRT_TRANSPORT_BC;
args.authflavor = ses->se_cb_sec.flavor;
}
/* Create RPC client */

1
include/linux/sunrpc/svc_xprt.h
View File

@ -33,6 +33,7 @@ struct svc_xprt_class {
struct svc_xprt_ops *xcl_ops;
struct list_head xcl_list;
u32 xcl_max_payload;
int xcl_ident;
};
/*

2
net/sunrpc/svcsock.c
View File

@ -692,6 +692,7 @@ static struct svc_xprt_class svc_udp_class = {
.xcl_owner = THIS_MODULE,
.xcl_ops = &svc_udp_ops,
.xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
.xcl_ident = XPRT_TRANSPORT_UDP,
};
static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
@ -1292,6 +1293,7 @@ static struct svc_xprt_class svc_tcp_class = {
.xcl_owner = THIS_MODULE,
.xcl_ops = &svc_tcp_ops,
.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
.xcl_ident = XPRT_TRANSPORT_TCP,
};
void svc_init_xprt_sock(void)

2
net/sunrpc/xprt.c
View File

@ -1306,7 +1306,7 @@ struct rpc_xprt *xprt_create_transport(struct xprt_create *args)
}
}
spin_unlock(&xprt_list_lock);
printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident);
dprintk("RPC: transport (%d) not supported\n", args->ident);
return ERR_PTR(-EIO);
found:

1
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -92,6 +92,7 @@ struct svc_xprt_class svc_rdma_class = {
.xcl_owner = THIS_MODULE,
.xcl_ops = &svc_rdma_ops,
.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
.xcl_ident = XPRT_TRANSPORT_RDMA,
};
struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)