mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-21 18:11:39 +00:00
Code Issues Releases Wiki Activity
linux-stable/net/sunrpc/xprtrdma
History
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
..
backchannel.c xprtrdma: kmalloc rpcrdma_ep separate from rpcrdma_xprt 2020-03-27 10:47:25 -04:00
frwr_ops.c xprtrdma: kmalloc rpcrdma_ep separate from rpcrdma_xprt 2020-03-27 10:47:25 -04:00
Makefile xprtrdma: Remove support for FMR memory registration 2019-01-02 12:05:17 -05:00
module.c NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00
rpc_rdma.c NFS client updates for Linux 5.7 2020-04-07 13:51:39 -07:00
svc_rdma.c svcrdma: Remove svc_rdma_wq 2019-08-19 10:59:28 -04:00
svc_rdma_backchannel.c SUNRPC: Fix backchannel RPC soft lockups 2020-04-17 12:40:31 -04:00
svc_rdma_recvfrom.c svcrdma: Fix double sync of transport header buffer 2020-03-16 12:04:33 -04:00
svc_rdma_rw.c svcrdma: Rename svcrdma_encode trace points in send routines 2020-03-16 12:04:32 -04:00
svc_rdma_sendto.c svcrdma: Avoid DMA mapping small RPC Replies 2020-03-16 12:04:33 -04:00
svc_rdma_transport.c svcrdma: Remove svcrdma_cm_event() trace point 2020-03-16 12:04:32 -04:00
transport.c xprtrdma: kmalloc rpcrdma_ep separate from rpcrdma_xprt 2020-03-27 10:47:25 -04:00
verbs.c xprtrdma: kmalloc rpcrdma_ep separate from rpcrdma_xprt 2020-03-27 10:47:25 -04:00
xprt_rdma.h xprtrdma: kmalloc rpcrdma_ep separate from rpcrdma_xprt 2020-03-27 10:47:25 -04:00