[lvm-devel] [PATCH] Propagate DMEVENTD_MONITOR_IGNORE to clvmd

[Petr Rockai]

Hi,

when I removed recursive calls from dmeventd to itself, I have relied on
DMEVENTD_MONITOR_IGNORE to block LVM commands from talking to
dmeventd. However, the implementation of DMEVENTD_MONITOR_IGNORE is
incorrect whenever clvmd is involved: clvmd will force monitoring off on
all volumes whenever DMEVENTD_MONITOR_IGNORE is used with current code.

This patch makes it possible to keep clvmd from touching dmeventd,
fixing the implementation of DMEVENTD_MONITOR_IGNORE and therefore also
dmeventd behaviour with locking_type 3.

The new locking flag should have no effect on older instances of clvmd
(in other words, these will still shut down monitoring whenever
--ignoremonitoring, or its equivalent used by dmeventd, is used). Old
LVM talking to new clvmd will behave as if --ignoremonitoring was always
in effect (which is probably still better than disabling monitoring on
unsuspecting users).

Petr

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