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Fixing recent commit 022ebb0cfe
Resize already has size that needs to be counted with,
otherwise upsizing operation could turn into size reduction one.
Since the parse_vdo_pool_status() become vdo_manip API part,
and there will be no 'dm' matching status parser,
the API can be simplified and closely match thin API here.
Now with newer VDO kvdo target we can start to use standard mechanism
to enable resize of VDO volumes.
VDO pool can be grown.
Virtual volume grows on top of VDO pool when is not big enough.
Reduced VDOLV is calling discard for reduced areas - this can
take long time!
TODO: implement some pollable mechanism for out-of-lock TRIM.
When using 'lvcreate -l100%VG' and there is big disproportion between
real available space and requested setting - automatically fallback
to 100%FREE.
Difference can be seen when VG is big and already most space was
allocated, so the requestion 100%VG can end (and by spec for % modifier
it's correct) as LV with size of 1%VG. Usually this is not a big
problem - buit in some cases - like cache-pool allocation, this
can result a big difference for chunksize selection.
With this patch it's more closely match common-sense logic without
the need of reitteration of too big changes in lvm2 core ATM.
TODO: in the future there should be allocator solving all allocations
in a single call.
When using caches with BIG pool size (>TB) there is required
to use relatively huge chunk size. Once the chunksize has
got over 1MiB - kernel cache target stopped writing such chunks
back on this if the migration_threshold remained on default 1MiB
(2048 sectors) size.
This patch ensure, DM layer will not let pass table line which
has not big enough migration threshold that can let pass
at least 8 chunks (independently of lvm2 metadata).
lvm uses 'minimum_io_size' name to exactly match VDO naming here,
however in all common cases _size is using 'sector/512b' unit.
But in this case the value is in bytes and can have only 2 values:
either 512 or 4096.
It's probably not worth to rename it internaly, so we can just
drop comment - instead of using 1 or 8.
Thought let's think about it....
Lvm can at times have duplicate names. When this happens the daemon will
internally use vg_name:vg_uuid as the name for lookups, but display just
the vg_name externally. If an API user uses the Manager.LookUpByLvmId and
queries the vg name they will only get returned one result as the API
can only accommodate returning 1. The one returned is the first instance
found when sorting the volume groups by UUID.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1583510
When we have two logical volumes which switch their names at the
same time we are left with incorrect lookups. Anytime we find
an entry by doing a lookup by UUID or by name we will ensure
that the lookups are indeed correct.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1642176
An idea from Zdenek for better ensuring valid hints by invalidating
them when pvscan --cache <device> sees a new PV, which is a case
where we know that hints should be invalidated. This is triggered
from systemd/udev logic, and there may be some cases where it would
invalidate hints that the existing methods wouldn't detect.
If there are two independent scripts doing:
vgchange --lockstart vg
lvchange -ay vg/lv
The first vgchange to do the lockstart will wait for
the lockstart to complete before returning.
The second vgchange to do the lockstart will see that
the start is already in progress (from the first) and
will do nothing. This means the second does not wait
for any lockstart to complete, and moves on to the
lvchange which may find the lockspace still starting
and fail.
To fix this, make the vgchange lockstart command
wait for any lockstart's in progress to complete.
Save the list of PVs in /run/lvm/hints. These hints
are used to reduce scanning in a number of commands
to only the PVs on the system, or only the PVs in a
requested VG (rather than all devices on the system.)
The systemd generators are executed very early during the switch
from initramfs to system partition and the syslog is not yet fully
operational - it may cause blocking, if some debug logging is enabled
at the same time in /etc/lvm/lvm.conf log{} section.
To avoid timeouting and killing this generator - rather enhance lvm
code to suppress any syslog communication when LVM_SUPPRESS_SYSLOG
envvar is set.
Use of this envvar is needed since the parsing of i.e. cmdline options
that could eventually override lvm.conf setting happens in this case
way too late and number of lines could have been already streamed to
syslog.
Fix a scenario where global/event_activation setting is not found. In
this case we need to take default value just like lvm tools do when
executed. So use "lvmconfig --type full".
Also, if we fail to execute lvmconfig for whatever reason, fallback to
generating the activation units as failsafe action.
Reported by: Bastian Blank <waldi debian org>
When initializing an LV to hold the writecache, use wipe_lv()
which looks for specific signatures on the LV.
Wiping signatures is not necessary, but printing a warning
that names a specific signature (in addition to the existing
generic warning/confirmation) may help if a user accidentally
specifies the wrong LV which contains something important.
