diff options
author | Chuck Lever <chuck.lever@oracle.com> | 2014-07-16 15:38:32 -0400 |
---|---|---|
committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-17 15:12:24 +0200 |
commit | 849f67c7e1843fbad81a6e0dbbbb1614acbe9c11 (patch) | |
tree | c9842d24166b3e13cf8ef63569f294a46ac884c3 /fs | |
parent | a6efb1347048618cf3ef8c3959b732a4b0989749 (diff) |
svcrdma: Select NFSv4.1 backchannel transport based on forward channel
commit 3c45ddf823d679a820adddd53b52c6699c9a05ac upstream.
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nfsd/nfs4callback.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index 3eaa6e30a2dc..cc8c5b32043c 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -672,7 +672,8 @@ 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 */ |