CIFS: Prepare credits code for a slot reservation

that is essential for CIFS/SMB/SMB2 oplock breaks and SMB2 echos.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d55de9684df9..2309a67738bf 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -315,12 +315,22 @@ in_flight(struct TCP_Server_Info *server)
         return num;
 }
 
+static inline int*
+get_credits_field(struct TCP_Server_Info *server)
+{
+        /*
+         * This will change to switch statement when we reserve slots for echos
+         * and oplock breaks.
+         */
+        return &server->credits;
+}
+
 static inline bool
-has_credits(struct TCP_Server_Info *server)
+has_credits(struct TCP_Server_Info *server, int *credits)
 {
         int num;
         spin_lock(&server->req_lock);
-        num = server->credits;
+        num = *credits;
         spin_unlock(&server->req_lock);
         return num > 0;
 }