[lvm-devel] vgchange.c gets dmeventd monitoring activation wrong
Heinz Mauelshagen
heinzm at redhat.com
Wed Mar 10 17:43:23 UTC 2010
Updating to Fedora 12 kernel 2.6.32.9-67.fc12.x86_64 I was left
with no root device.
Reason was, that we don't get dmeventd device monitoring activation
(deactivation in this case rather) right, hence causing dlopen on
libdevemapper-event DSO(s) via the dmeventd call chain.
The DSOs are intentionally not part of the initramfs for obvious
reasons, which should be respected by the fact, that we call "vgchange
--monitor n" from dracut's lvm_scan script.
This patch is a proposal to fix the dmeventd activation handling via the
"--ignoremonitoring" and the "--monitor {y|n}"
options and is not tested yet.
It give precedence to the "--ignoremonitoring" option over the other
one, which makes more sense IMO and needs a vgchange(8) manual change to
reflect this.
Of course we should better raise a command line error if both are given,
which is subject to future discussion.
Signed-off-by: Heinz Mauelshagen <heinzm at redhat.com>
---
LVM2.2.02.53/tools/{vgchange.c.orig => vgchange.c} | 16 ++++++++++++----
1 files changed, 12 insertions(+), 4 deletions(-)
diff --git LVM2.2.02.53/tools/vgchange.c.orig LVM2.2.02.53/tools/vgchange.c
index 95b0b48..e789cc4 100644
--- LVM2.2.02.53/tools/vgchange.c.orig
+++ LVM2.2.02.53/tools/vgchange.c
@@ -494,16 +494,24 @@ static int vgchange_single(struct cmd_context *cmd, const char *vg_name,
struct volume_group *vg,
void *handle __attribute((unused)))
{
- int r = ECMD_FAILED;
+ int dmeventd_mode, r = ECMD_FAILED;
if (vg_is_exported(vg)) {
log_error("Volume group \"%s\" is exported", vg_name);
return ECMD_FAILED;
}
- init_dmeventd_monitor(arg_int_value(cmd, monitor_ARG,
- (is_static() || arg_count(cmd, ignoremonitoring_ARG)) ?
- DMEVENTD_MONITOR_IGNORE : DEFAULT_DMEVENTD_MONITOR));
+ /* Check conditions to activate dmeventd montoring. */
+ if (is_static())
+ dmeventd_mode = DMEVENTD_MONITOR_IGNORE;
+ else if (arg_count(cmd, ignoremonitoring_ARG))
+ dmeventd_mode = DMEVENTD_MONITOR_IGNORE;
+ else if (!arg_int_value(cmd, monitor_ARG, 1))
+ dmeventd_mode = DMEVENTD_MONITOR_IGNORE;
+ else
+ dmeventd_mode = DEFAULT_DMEVENTD_MONITOR;
+
+ init_dmeventd_monitor(dmeventd_mode);
if (arg_count(cmd, available_ARG))
r = _vgchange_available(cmd, vg);
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