Chuck Lever 6221f1d9b6 SUNRPC: Fix backchannel RPC soft lockups ... Currently, after the forward channel connection goes away, backchannel operations are causing soft lockups on the server because call_transmit_status's SOFTCONN logic ignores ENOTCONN. Such backchannel Calls are aggressively retried until the client reconnects. Backchannel Calls should use RPC_TASK_NOCONNECT rather than RPC_TASK_SOFTCONN. If there is no forward connection, the server is not capable of establishing a connection back to the client, thus that backchannel request should fail before the server attempts to send it. Commit 58255a4e3c ("NFSD: NFSv4 callback client should use RPC_TASK_SOFTCONN") was merged several years before RPC_TASK_NOCONNECT was available. Because setup_callback_client() explicitly sets NOPING, the NFSv4.0 callback connection depends on the first callback RPC to initiate a connection to the client. Thus NFSv4.0 needs to continue to use RPC_TASK_SOFTCONN. Suggested-by: Trond Myklebust <trondmy@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Cc: <stable@vger.kernel.org> # v4.20+		2020-04-17 12:40:31 -04:00
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acl.h
auth.c
auth.h
blocklayout.c
blocklayoutxdr.c
blocklayoutxdr.h
cache.h
current_stateid.h
export.c
export.h
fault_inject.c
filecache.c
filecache.h
flexfilelayout.c
flexfilelayoutxdr.c
flexfilelayoutxdr.h
idmap.h
Kconfig
lockd.c
Makefile
netns.h
nfs2acl.c
nfs3acl.c
nfs3proc.c
nfs3xdr.c
nfs4acl.c
nfs4callback.c	SUNRPC: Fix backchannel RPC soft lockups	2020-04-17 12:40:31 -04:00
nfs4idmap.c
nfs4layouts.c
nfs4proc.c
nfs4recover.c
nfs4state.c
nfs4xdr.c
nfscache.c
nfsctl.c
nfsd.h
nfsfh.c
nfsfh.h
nfsproc.c
nfssvc.c
nfsxdr.c
pnfs.h
state.h
stats.c
stats.h
trace.c
trace.h
vfs.c
vfs.h
xdr.h
xdr3.h
xdr4.h
xdr4cb.h