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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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include/linux/sunrpc/svc_xprt.h
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@@ -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;
};
/*