[lustre-discuss] kernel 5.10 on RHEL8 and lustre-client kind of working

[Andrej Filipcic]

Hi,

I compiled the master from today (commit 
0b7ddf32e336b06d459880faf9831db43ffae9cf) on 5.10.34 kernel with mpi 
support (RHEL8.3 otherwise), and it seems to work properly for me. I 
needed to do the following changes, while cross-checking LU-14195

diff --git a/lnet/lnet/lib-socket.c b/lnet/lnet/lib-socket.c
index 4a86114ecf..1412d9deb0 100644
--- a/lnet/lnet/lib-socket.c
+++ b/lnet/lnet/lib-socket.c
@@ -343,9 +343,10 @@ struct socket *
  lnet_sock_listen(int local_port, int backlog, struct net *ns)
  {
         struct socket *sock;
-       mm_segment_t oldfs;
+       //mm_segment_t oldfs;
         int val = 0;
         int rc;
+       sockptr_t sval;

         sock = lnet_sock_create(-1, NULL, local_port, ns);
         if (IS_ERR(sock)) {
@@ -360,11 +361,13 @@ lnet_sock_listen(int local_port, int backlog, 
struct net *ns)
          * This is the default, but it can be overridden so
          * we force it back.
          */
-       oldfs = get_fs();
-       set_fs(KERNEL_DS);
+       //oldfs = get_fs();
+       //set_fs(KERNEL_DS);
+       //sock->ops->setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
+       //                    (char __user __force *) &val, sizeof(val));
         sock->ops->setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
-                             (char __user __force *) &val, sizeof(val));
-       set_fs(oldfs);
+                              sval, sizeof(val));
+       //set_fs(oldfs);

         rc = kernel_listen(sock, backlog);
         if (rc == 0)

With this version, the client works quite fine over o2ib (Mellanox 
drivers) with DDN Lustre servers  2.12.6, tested with several writes, 
unpacking and compiling kernel in lustre etc...

Can somebody please tell  if the fixes above are correct, or if there is 
any danger in using the master for clients in production?

Best regards,
Andrej

-- 
_____________________________________________________________
    prof. dr. Andrej Filipcic,   E-mail: Andrej.Filipcic at ijs.si
    Department of Experimental High Energy Physics - F9
    Jozef Stefan Institute, Jamova 39, P.o.Box 3000
    SI-1001 Ljubljana, Slovenia
    Tel.: +386-1-477-3674    Fax: +386-1-425-7074
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