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| author | Alexander Aring <aahringo@redhat.com> | 2022-06-22 14:45:19 -0400 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2022-06-24 11:57:49 -0500 |
| commit | f10da927a5e2b0998dca3e5607b39fb8ec007485 (patch) | |
| tree | fc5e565661a8fea79db35cafbd8dbde46a75096f /fs/dlm | |
| parent | 3182599f5fff93a30bc094a4a20924eea47fcf42 (diff) | |
| download | linux-f10da927a5e2b0998dca3e5607b39fb8ec007485.tar.gz linux-f10da927a5e2b0998dca3e5607b39fb8ec007485.tar.bz2 linux-f10da927a5e2b0998dca3e5607b39fb8ec007485.zip | |
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>
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/dlm_internal.h | 8 |
1 files changed, 8 insertions, 0 deletions
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 |