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Fix/support creation and usage of the external origin
across thin-pools - so thin LV can use thin LV from
some other thin-pool as external origin (read-only).
When creating external origin via 'lvcreate --type thin'
add the validation for LV being usable as external origin
since certain LVs cannot be really used this way.
Also call this function early during lvcreate cmdline arg
validation se we do not need to do unecesary operation.
Over the time the code for preloading detached LVs got unnecessarily
complicate. But actually we need to preload only LVs that
were previously non-toplevel (invisible) LVs and became visible
toplevel LVs in the precommitted metadata.
If there would be needed some other rule, it would likely be a bug in
conversion code forgetting to set visibility flag on detached LV.
This reduces number of unnecessary repeated DM tree preloading.
External origins for thin volumes can be also used at the same time
as old(thick) snapshot origins. However in this case it's possible
the LV is only active as being 'external' origin, but old snapshot LVs
are not active. For this case before handling these
LVs for un/monitoring check the active state of origin LV.
This should prevent warnings of monitoring failures.
Make recursive directory path creation reusable via
dir_create_recursive.
While we already have dm_create_dir() - it's not taking mode arg,
so let's make lvm's internal file helper function.
Instead of parsing the whole /proc/kallsyms use faster variant
of using modprobe tool logic.
lvm2 here wants to know whether the particular DM cache policy is
present in the kernel - however since the cache policy does not have
any kernel module parameters and it can be built-in to a kernel
there is no /sys/modules directory in such case and we would need to call
modprobe everytime we want detect such case.
The old solution tried to look for particular kernel symbol
(and like not the right way, as smq_exit might be actually ommitted).
New version checks MODULES_PATH/`uname -r`/modules.builtin for
whether is present cache policy module instead of CPU expensive parsing
of kallsyms.
If lvm.conf has use_devicesfile=0 and /etc/lvm/device/system.devices
exists, then rename it to system.devices-unused.YYYYMMDD.HHMMSS.
This prevents an old, incorrect system.devices from being used in
the future if lvm.conf is changed to use_devicesfile=1.
Create backup copies of system.devices in /etc/lvm/devices/backup
named system.devices-YYYYMMDD.HHMMSS.NNNN. NNNN is the version
counter from the file.
Each time that an lvm command writes a new system.devices file,
it also writes the same file in the backup directory.
A new comment line is added to system.devices with HASH=<num>
where <num> is a crc calculated from the uncommented lines in
system.devices. This lets lvm detect if the file has been
modified outside of lvm itself.
If system.devices is edited directly, the next time a command
reads the file, the crc will not match the HASH value. The
command will then rewrite system.devices with the correct HASH
value, and create a backup reflecting the edits.
A default limit of 50 backup files is kept, configurable by
lvm.conf devicesfile_backup_limit (set to 0 to disable backups.)
Since understanding the reason for choosing the appmachineid over the
direct use of machineid is not easily found, I extended to help text to
clarify this a bit.
Function to recalc chunk_size according to dev hints needs to be
used after chunk_size is being set to thin pool segment - correct
this ordering mistake introduced in previous refactoring commit.
Previous patch that introduced support for thinpool with vdo
not correctly handled header size - as this part is not fully usable
yet. We are going to try to use the 0, but current state of code is not
yet compliant to this logic so keep vdo_header_size during conversion
and alos correctly pass through virtual_extents to vdo formating.
Add code to handle creation of thin-pool with VDO data backend
which can be seen as compressed deduplicated thin-pool.
To avoid need of changing to many internal APIs, pass the conversion
parameters for create thin-pool data volume via cmd_context.
Introduce struct vdo_convert_params {} to pass-in all the parameters
needed for the conversion of an LV to a vdopool + vdo LV.
Function convert_vdo_lv() is also able to create a new LV and swap
segments, so the passed in LV can be later on use for futher
conversion so this refactoring makes it ready for more enhanced
usage.
Introduce vdo_convert_params and use vdo_params from this structure
also with lvcreate_params.
Later we will use this for convertion of thin-pool data volume to VDO.
The first lv_attr flag is 'i' or 'I' for a raid image.
(i: raid image, I: out of sync raid image)
For integrity raid images (_iorig), the flag was not being set.
pvs -A|--allpvs
Show PVs that would otherwise be excluded by the devices file.
pvscan -A|--allpvs
Show PVs that would otherwise be excluded by the devices file.
For those devices that are included by the devices file,
their device ID is displayed in place of the usual "lvm2"
format and size.
(pvs -a|--all is unchanged, and shows devices not formatted as PVs.)
A pvid string read from system.devices could be less
then ID_LEN since system.devices fields can be edited.
Ensure the pvid buffer is ID_LEN+1 even if the string
read from the file is shorter.
Include info in the temp file to confirm that it should be used.
The temp file is meant to suppress repeated, identical searches
for the same PVIDs on the same set of devices. Write to the file
a count and hash of the missing PVIDs and a count and hash of the
devices to search. A subsequent command will ignore and remove
the temp file if any of these values differ. We don't want to
suppress a search if a change has occured, and a missing PV could
be found by scanning devices.
Problematic scenario:
. the device for a PV has no wwid, so it's identified in system.devices
with IDTYPE=devname IDNAME=/dev/foo
. user adds/enables a wwid for the device
. on reboot, the device name changes, e.g. now /dev/bar
. the code that searches for the new device name includes an
optimization to skip looking on devs that have a wwid, on
the basis that a device with a wwid won't have IDTYPE=devname
. this optimization causes lvm to not look for the PV on /dev/bar
since that device now has a wwid, so the PV is not found
. the optimization is enabled by search_for_devnames="auto"
. change the default to search_for_devnames="all" which does not
use the problematic optimization
- add new comparison between old and new entries, and use this
as the basis for new dedicated output for check and update
- add new --refresh option to search for missing PVIDs on all
devices, and possibly update the device ID
- internally, only use the term "refresh" for cases where a
new device ID may be found and assigned for a missing PVID
Incorrectly matching a dev to a devname id (due to changing devnames)
before matching the dev to a proper device id, can result in the
dev not being matched to the real id.
With commit d7e922480e
lvconvert -m may fail if we try to remove 1st. leg that
is out-of-sync while other leg is in-sync.
Hot fix allows to proceed with such down conversion.
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
