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We need to use "--verifyudev" for dmsetup mangle command used in
the name-mangling test since without the --verifyudev, we'd end up
with the failed rename.
Also, add direct check for the dev nodes - node with old name must
be gone and node with new name must be present. Before, we checked
just the output of the command.
One bug popped up here when renaming with udev and libdevmapper
fallback checking the udev when target mangle mode is "none"
(fixme added in the libdevmapper's node rename code).
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.
