smb3: display session id in debug data

Displaying the session id in /proc/fs/cifs/DebugData
is needed in order to correlate Linux client information
with network and server traces for many common support
scenarios.  Turned out to be very important for debugging.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 6a69f11..45e74da 100644 (file)
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -380,6 +380,8 @@ skip_rdma:
                                atomic_read(&server->in_send),
                                atomic_read(&server->num_waiters));
 #endif
+                       /* dump session id helpful for use with network trace */
+                       seq_printf(m, " SessionId: 0x%llx", ses->Suid);
                        if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
                                seq_puts(m, " encrypted");
                        if (ses->sign)