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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 <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2022-06-22 14:45:19 -04:00 committed by David Teigland
parent 3182599f5f
commit f10da927a5
1 changed files with 8 additions and 0 deletions
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8
fs/dlm/dlm_internal.h
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@ -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