smb3: track the instance of each session for debugging

Each time we reconnect to the same server, bump an instance
counter (and display in /proc/fs/cifs/DebugData) to make it
easier to debug.

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 11b4f397a713..41342a8dc53e 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -110,6 +110,8 @@ smb2_set_credits(struct TCP_Server_Info *server, const int val)
 {
         spin_lock(&server->req_lock);
         server->credits = val;
+        if (val == 1)
+                server->reconnect_instance++;
         spin_unlock(&server->req_lock);
 }