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cmirrord polls for messages on the kernel and cluster interfaces.
Sometimes it is possible for messages to be received on the cluster
interface and be waiting for processing while the node is in the
process of leaving the cluster group. When this happens, the
messages received on the cluster interface are attempted to be
dispatched, but an error is returned because the connection is no
longer valid. It is a harmless situation. So, if we get the
specific error (CS_ERR_BAD_HANDLE) and we know that we have left
the group, then simply don't print the message.
If the PV label is lost (e.g. by doing a dd on the device), call
"systemd-run pvscan --cache <major>:<minor>" in 69-dm-lvm-metad.rules
to inform lvmetad about this state.
The reason for this is that ENV{SYSTEMD_WANTS}="lvm2-pvscan@<major>:<minor>"
logic will not cause the pvscan to be fired in this case since this works
only on proper device addition/removal cycle - the lvm2-pvscan service's
ExecStop is called only on proper REMOVE event - the service is bound to
device existence. Hence we need pvscan call via systemd-run (that
instantiates a quick transient service just to call the command).
See also https://bugzilla.redhat.com/show_bug.cgi?id=1063813.
It's not so easy to recongnize unusable /dev/kmsg
Reorder the code in a way if the first regular read of /dev/kmsg
fail, fallback to klogctl interface.
Call drain_dmesg also for the case there is no user log output.
Add a bit more complexity here - Switch to use /dev/kmsg
which has been introduced in 3.5 kernels and could run without
lossing lines from /proc/kmsg.
On older systems user may set env var LVM_TEST_CAN_CLOBBER_DMESG=1
to get kernel messages via klogctl() call (which deletes dmesg buffer)
otherwise no logging of kernel messages is provided.
Since there could be multiple readers of kmsg (test & journald) it needs
to be fast, to capture things like sysrq trace.
But to capture whole output it would need to prioritize reading of kmsg,
thus we would first log kernel messages and followed by command output.
As a trade-off always log command output first and use large drain
buffer so is captures most of messages, but occasionaly miss some
lines.
Use separate files for raid1, raid456, raid10.
They need different target versions to work, so support
more precise test selection.
Optimize duplicate tests of target avalability and skip
unsupported test cases sooner.
Basically reverts commit af8580d756.
"test: Use klogctl in the harness instead of reading /var/log/messages."
Problem is - this interface clears dmesg buffer
(just like call of dmesg -c)
Thus after running lvm2 test suitedmesg is empty - while all the
messages are usually logged in the journal/message, it's still not nice to
clear dmesg buffer.
It's not a pure revert, but switch to use /proc/kmsg directly instead of
reading /var/log/messages.
In cases where PV appears on a new device without disappearing from an old one
first, the device->pvid pointers could become ambiguous. This could cause the
ambiguous PV to be lost from the cache when a different PV comes up on one of
the ambiguous devices.
This is probably not optimal, but makes the lvmetad case mimic non-lvmetad code
more closely. It also fixes vgremove of a partially corrupt VG with lvmetad, as
_vg_write_raw (and consequently, entire vg_write) currently panics when it
encounters a corrupt MDA. Ideally, we'd be able to explicitly control when it is
safe to ignore them.
