5.15-stable review patch. If anyone has any objections, please let me know.
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From: Anna Schumaker Anna.Schumaker@Netapp.com
commit f06d1b10cb016d5aaecdb1804fefca025387bd10 upstream.
Olga showed me a case where the client was sending multiple READ_PLUS calls to the server in parallel, and the server replied NFS4ERR_OPNOTSUPP to each. The client would fall back to READ for the first reply, but fail to retry the other calls.
I fix this by removing the test for NFS_CAP_READ_PLUS in nfs4_read_plus_not_supported(). This allows us to reschedule any READ_PLUS call that has a NFS4ERR_OPNOTSUPP return value, even after the capability has been cleared.
Reported-by: Olga Kornievskaia kolga@netapp.com Fixes: c567552612ec ("NFS: Add READ_PLUS data segment support") Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Anna Schumaker Anna.Schumaker@Netapp.com Reviewed-by: Benjamin Coddington bcodding@redhat.com Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/nfs/nfs4proc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -5421,7 +5421,7 @@ static bool nfs4_read_plus_not_supported struct rpc_message *msg = &task->tk_msg;
if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && - server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { + task->tk_status == -ENOTSUPP) { server->caps &= ~NFS_CAP_READ_PLUS; msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; rpc_restart_call_prepare(task);