From f10da927a5e2b0998dca3e5607b39fb8ec007485 Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Wed, 22 Jun 2022 14:45:19 -0400 Subject: fs: dlm: add comment about lkb IFL flags This patch adds comments about the difference between the lower 2 bytes of lkb flags and the 2 upper bytes of the lkb IFL flags. In short the upper 2 bytes will be handled as internal flags whereas the lower 2 bytes are part of the DLM protocol and are used to exchange messages. Signed-off-by: Alexander Aring Signed-off-by: David Teigland --- fs/dlm/dlm_internal.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'fs/dlm/dlm_internal.h') diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h index c03388a3875c..afec22b1a65f 100644 --- a/fs/dlm/dlm_internal.h +++ b/fs/dlm/dlm_internal.h @@ -207,6 +207,14 @@ struct dlm_args { #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */ +/* least significant 2 bytes are message changed, they are full transmitted + * but at receive side only the 2 bytes LSB will be set. + * + * Even wireshark dlm dissector does only evaluate the lower bytes and note + * that they may not be used on transceiver side, we assume the higher bytes + * are for internal use or reserved so long they are not parsed on receiver + * side. + */ #define DLM_IFL_USER 0x00000001 #define DLM_IFL_ORPHAN 0x00000002 -- cgit v1.2.3