smbd: Set SHARE_MODE_HAS_READ_LEASE when granting a read lease

Lazy update of the flag: Whenever we add a read lease, we have to set
the flag. Nobody except contend_level2_oplocks_begin will remove that
flag again, as this would mean a full lease traverse when removing
one. And contend_level2_oplocks_begin traverses the leases anyway

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

source3/smbd/open.c

@@ -2355,6 +2355,10 @@ static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
 		return NT_STATUS_NO_MEMORY;
 	}
 
+	if (granted & SMB2_LEASE_READ) {
+		lck->data->flags |= SHARE_MODE_HAS_READ_LEASE;
+	}
+
 	ok = update_num_read_oplocks(fsp, lck);
 	if (!ok) {
 		del_share_mode(lck, fsp);