Chuck Lever f5e13d700a SUNRPC: Fix NFSD's request deferral on RDMA transports ... commit 773f91b2cf upstream. Trond Myklebust reports an NFSD crash in svc_rdma_sendto(). Further investigation shows that the crash occurred while NFSD was handling a deferred request. This patch addresses two inter-related issues that prevent request deferral from working correctly for RPC/RDMA requests: 1. Prevent the crash by ensuring that the original svc_rqst::rq_xprt_ctxt value is available when the request is revisited. Otherwise svc_rdma_sendto() does not have a Receive context available with which to construct its reply. 2. Possibly since before commit 71641d99ce ("svcrdma: Properly compute .len and .buflen for received RPC Calls"), svc_rdma_recvfrom() did not include the transport header in the returned xdr_buf. There should have been no need for svc_defer() and friends to save and restore that header, as of that commit. This issue is addressed in a backport-friendly way by simply having svc_rdma_recvfrom() set rq_xprt_hlen to zero unconditionally, just as svc_tcp_recvfrom() does. This enables svc_deferred_recv() to correctly reconstruct an RPC message received via RPC/RDMA. Reported-by: Trond Myklebust <trondmy@hammerspace.com> Link: https://lore.kernel.org/linux-nfs/82662b7190f26fb304eb0ab1bb04279072439d4e.camel@hammerspace.com/ Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-04-20 09:34:18 +02:00
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auth_gss	…
xprtrdma	SUNRPC: Fix NFSD's request deferral on RDMA transports	2022-04-20 09:34:18 +02:00
Kconfig	…
Makefile	…
addr.c	…
auth.c	…
auth_null.c	…
auth_unix.c	…
backchannel_rqst.c	…
cache.c	…
clnt.c	SUNRPC: Handle low memory situations in call_status()	2022-04-13 20:59:20 +02:00
debugfs.c	…
fail.h	…
netns.h	…
rpc_pipe.c	…
rpcb_clnt.c	…
sched.c	SUNRPC: remove scheduling boost for "SWAPPER" tasks.	2022-04-13 20:59:12 +02:00
socklib.c	…
socklib.h	…
stats.c	…
sunrpc.h	…
sunrpc_syms.c	…
svc.c	NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment()	2022-03-08 19:12:33 +01:00
svc_xprt.c	SUNRPC: Fix NFSD's request deferral on RDMA transports	2022-04-20 09:34:18 +02:00
svcauth.c	…
svcauth_unix.c	…
svcsock.c	SUNRPC: svc_tcp_sendmsg() should handle errors from xdr_alloc_bvec()	2022-04-13 20:59:20 +02:00
sysctl.c	…
sysfs.c	sunrpc: Fix potential race conditions in rpc_sysfs_xprt_state_change()	2022-02-16 12:56:10 +01:00
sysfs.h	…
timer.c	…
xdr.c	…
xprt.c	SUNRPC: Prevent immediate close+reconnect	2022-04-13 20:59:24 +02:00
xprtmultipath.c	…
xprtsock.c	SUNRPC: Don't call connect() more than once on a TCP socket	2022-04-13 20:59:26 +02:00